JP5165940B2 - Granulated product production method and granulation equipment of metal-containing by-product - Google Patents

Description

  The present invention relates to a method for producing a granulated product using metal-containing by-products such as scale and grinder powder generated in a steel material production process, and a granulation facility used in the production method.

  In a steel material manufacturing process in which a metal steel material is manufactured through processes such as melting, casting, rolling, and refining, metal-containing byproducts containing valuable metals such as Fe, Ni, and Cr are generated in each process. For example, scarfing scraps are generated by removing surface defects on slabs and steel slabs. In the rolling process, oxides generated on the material surface are peeled off to produce oxide scales. When the steel slab and the surface flaws of the product are removed, grinder powder is generated. Then, it is desired that the metal-containing by-product containing valuable metals is reused by charging it into a melting furnace as a metal raw material from the viewpoint of resource recovery.

However, the metal-containing by-product is fine as a melting raw material and is inconvenient to handle as it is, which causes a hesitation in reusing the metal-containing by-product. Therefore, it is conceivable that the metal-containing by-product is made into a granulated product by compression granulation (see Patent Document 1) or rolling granulation (see Patent Document 2) to facilitate handling.
JP 2004-35951 A JP 2002-97514 A

  For example, in Patent Document 1, a waste plastic is mixed as a binder with iron-containing waste such as iron oxide scale and dust, and the waste plastic is heated to compress and granulate the iron-containing waste to form a briquette. A method has been proposed. However, a briquette machine that granulates a mixture of scale, dust, and binder into briquettes requires that the particle size and moisture of the raw materials used be strictly adjusted before granulation, which increases the production cost of the granulated product. The difficulty that it tends to become is pointed out. In addition, when a plastic is used as the binder, the plastic is heated and softened to function as a binder, so that there is a problem that a heating apparatus is required and the apparatus cost is further increased.

  In Patent Document 2, a fly ash is mixed with at least one of iron-containing waste such as scale, waste sand, waste plastic, paper sludge, and waste toner, and then granulated by rolling and granulation. A method of forming is disclosed. The aforementioned metal-containing by-products such as scale and grinder powder have a particle size ranging from 1 mm or less to about 15 mm, a wide range of particle size distribution, and a non-uniform shape. That is, the metal-containing by-product is fine to the extent that it is difficult to handle, but the particle size is large to form a granulated product by rolling granulation. Things cannot be formed efficiently. In addition, even if the granulated material is formed, the crushing strength of the granulated material is small, and the granulated material may collapse in the middle of transportation, so that the metal-containing by-product can be reused as a valuable metal source in the electric furnace (recovery rate). ) Will be low.

  That is, the present invention has been proposed in view of the above-mentioned problems inherent in the prior art described above, and has been proposed to suitably solve this problem, and is a metal-containing by-product such as scale and grinder powder generated in the steel material manufacturing process. An object of the present invention is to provide a granulated product production method and granulation facility for metal-containing by-products which can be made into a granulated product with excellent handling properties at low cost.

In order to solve the above-described problems and achieve the intended purpose, a method for producing a granulated product of a metal-containing byproduct according to the invention of claim 1 comprises:
Generated in steel production process, a mixture ratio of the particle diameter of more than 1mm has been mixed in a processing tank and a metal-containing by-products and dust in the range of more than 70 wt%, as the hydrated metal byproducts finer the Crush in a processing tank,
A granulated product is produced by rolling and granulating a mixture containing 20% by weight or more of dust and having a moisture content in the range of 4 to 15% by weight in the treatment tank. .
According to the first aspect of the invention, the dust is mixed with the metal-containing by-product at a ratio of 20% by weight or more, and the water content of the mixture is in the range of 4% by weight to 15% by weight. The metal-containing by-product can be granulated by rolling granulation without using it, and the production cost can be kept low. Since the metal-containing by-product is crushed, a granulated product can be formed even if it contains a large amount of metal-containing by-product having a large particle size.

The invention according to 請 Motomeko 2, to the mixture, characterized by mixing the aggregate.
According to the second aspect of the present invention, the metal-containing by-product is mixed with dust and agglomerate, and the moisture content of the mixture is in the range of 4% by weight to 15% by weight. Metal by-products can be granulated by rolling granulation, and the production cost can be kept low. Moreover, a granulated product having a large particle size and good handleability can be produced by the aggregation effect of the aggregate.

The gist of the invention according to claim 3 is that the dust has a particle size ratio of 0.5 mm or less in a range of 95% by weight or more.
According to the invention which concerns on Claim 3 , granulation property improves by using a fine dust.

In order to solve the above problems and achieve the intended purpose, the granulation equipment used in the method for producing a granulated product of a metal-containing byproduct of the invention according to claim 4 of the present application,
A granulation facility used in the method for producing a granulated product of a metal-containing byproduct according to any one of claims 1 to 3 ,
Metallized products generated in the steel manufacturing process, and the processing bath cylindrical dust and additive and water is charged,
The center of the processing tank is installed in the processing tank in an inclined posture away from the bottom surface of the processing tank from the one side extending in the radial direction of the processing tank toward the other side facing the one side. A blade that rotates in the forward direction with the one side portion as the front side in the rotational direction and the reverse direction with the other side portion as the front side in the rotational direction.
A rotor that rotates in the same direction as the forward direction of the blade while rotating in the forward and reverse directions around the center of the processing tank together with the blade,
Control means for controlling the rotation speed of the rotor, the rotation direction and the rotation speed of the blade,
The control means includes
In the initial stage of granulation, the blade is rotated in the reverse direction at the first rotation speed, and the rotor is rotated at the first rotation speed, thereby mixing the metal-containing by-product, dust and additives. Crushing the metal-containing by-product ,
In the middle stage of granulation, the blade rotates in the positive direction at a second rotation speed set higher than the first rotation speed, and the rotor rotates at a second rotation speed set lower than the first rotation speed. By controlling so as to form a granulated product from the mixture,
Granulation final step, while rotating the blade in the forward direction at the second rotation speed, the rotor by controlling to rotate at a third rotation speed set slower than the second rotation speed, granulation It is characterized by growing grains .
According to the invention of claim 4 , even if the metal-containing by-product having a large particle size is included by adjusting the rotation direction and rotation speed of the blade and the rotation speed of the rotor in accordance with the formation stage of the granulated product. A granulated product can be formed by rolling granulation. In particular, since the metal-containing by-product is crushed between the bottom of the treatment tank and the blade in the initial stage of granulation to form the nucleus of the granulated product, there is no need to add a coagulant or adsorbent. A granulated product can be formed from a metal-containing byproduct having a large particle size. In addition, the metal-containing by-product can be crushed, mixed, kneaded and granulated with a single facility, and the facilities can be reduced, so the cost required to form the granulated product from the metal-containing by-product can be reduced. . Furthermore, the obtained granulated material is not hardened on the surface by the action of a coagulant or an adsorbent, but is formed by repeated adsorption and consolidation of particles in rolling granulation, Is excellent. Therefore, the obtained granulated product is difficult to decompose, has excellent handleability, and can be prevented from collapsing in the middle of conveyance, so that the recycling efficiency of the metal-containing byproduct can be improved.

The invention according to claim 5 is characterized in that the portion of the treatment tank in contact with the metal-containing byproduct, the blade and the rotor are made of a wear-resistant metal material.
According to the invention which concerns on Claim 5 , since the part which a metal-containing by-product contacts is comprised with an abrasion-resistant material, the wear and damage at the time of using a metal-containing by-product can be suppressed, and the lifetime of an installation can be improved. .

  According to the granulated product production method and granulation facility for metal-containing by-products according to the present invention, a granulated product that is easy to handle can be produced at low cost.

  Next, a method for producing a granulated product of a metal-containing byproduct according to the present invention and a granulation facility used in the production method will be described below with reference to the accompanying drawings by way of preferred examples.

  First, the granulation equipment used suitably for the granulated product manufacturing method of the metal-containing by-product which concerns on this invention is demonstrated. FIG. 1 is a schematic plan view showing a recycling plant 10 including a granulation facility 30. The recycling plant 10 includes a first hopper 12 that receives a metal-containing byproduct, a second hopper 14 that receives a reducing material such as silicon carbide (SiC), a dust silo 24 that stores dust, a metal-containing material, and a reducing material. And granulation / sizing equipment for forming a granulated product from a mixture of dust and water. The granulation and sizing equipment includes a granulation equipment 30 that forms a granulated product by rolling and granulating the mixture, and the granulation treatment of the granulation equipment 30 grows to a size that makes most of the mixture easy to handle. However, there are cases where a granular material that has not grown to a size that is easy to handle or a mixture of non-granulated particles (collectively referred to as “ungranulated material”). Therefore, in the granulation and sizing facility of this example, the granulated product and the ungranulated product taken out from the granulation facility 30 are received, and the sizing is performed to form the granulated product from the ungranulated product. A facility 70 is provided. The reducing material is blended for the purpose of removing impurities from the molten steel when the granulated material is charged in an electric furnace and reused, and it is reduced with respect to the formation of the granulated material by rolling granulation. It is not an essential requirement to mix the materials.

  Here, the metal-containing by-product generated in the steel material manufacturing process is scarfing scrap generated by removing surface defects of slabs and steel slabs, oxide scales generated on the material surface in the rolling process, and strip rolling This refers to cutting waste generated when cutting, or grinder powder generated when removing steel pieces or surface flaws of products, and these are used alone or in combination. The dust is dust collected when a metal raw material is melted in an electric furnace or the like and collected in steelmaking and steel material processing steps. Further, in the specification, “dust” is a generic term for dust collected from a dust generation facility by a dust collector, and “scale” is a generic term for surface oxides generated during the processing of metal materials. “Grinder powder” is a generic term for metal scrap generated when cutting or cutting a raw material in a metal material processing step.

  The first hopper 12 is provided with a vibrating screen (not shown) having a mesh width set to about 60 mm, and a metal-containing by-product having a large particle size that is not suitable for rolling granulation is obtained by the vibrating screen. Eliminated. Between the first hopper 12 and the granulation facility 30, a first conveyor 16 for transferring metal-containing byproducts from the first hopper 12 to the granulation facility 30 is installed, and the second hopper 14 and the granulation facility 30. In between, the 2nd conveyor 17 which transfers a reducing material from the 2nd hopper 14 to the granulation equipment 30 is installed.

  In the recycling plant 10, an example in which a dust silo 24 is provided for each dust discharge source and each dust component, and four dust silos 24 are provided. In this example, dust recovered from a ladle refining device (LF), dust recovered from an argon oxygen decarburizer (AOD), nickel-based dust in an electric furnace, and chromium-based dust in an electric furnace Are stored separately in each dust silo 24. Each dust silo 24 includes a transfer pipe 25 that transfers the stored dust to the granulation facility 30 by pneumatic feeding. Each transfer pipe 25 is connected to a measuring device 26 provided at the upper end of the granulation facility 30 at each transfer end, and receives the dust transferred from the dust silo 24 through the transfer tube 25 by the measuring device 26. The required amount of dust measured in step 1 is charged into the granulation facility 30. One measuring device 26 is provided corresponding to each dust silo 24, and the dust is charged into the granulation facility 30 by being cut for each dust silo 24.

  A third conveyor 18 that receives the granulated material and the ungranulated material taken out from the granulating facility 30 and transfers them to the granulating facility 70 is installed at the lower part of the granulating facility 30. And the 4th conveyor 19 which receives the granulated material formed in the granulated equipment 70 and transfers to the product yard 100 which accumulates the granulated material is installed in the extraction side of the granulated equipment 70. In addition, the 1st conveyor 16, the 2nd conveyor 17, the 3rd conveyor 18, and the 4th conveyor 19 are provided with a cover, and dust is not leaked outside and rainwater is not mixed in a transfer thing.

  With reference to FIGS. 2-5, the granulation equipment 30 is demonstrated concretely. The granulation facility 30 is provided with a cylindrical processing tank 32 for receiving a metal-containing byproduct, a reducing material, dust, and water, a blade 52 provided in the processing tank 32, and the processing tank 32. The rotor 56 and the control means 68 which controls each apparatus of the granulation equipment 30 are provided. The processing tank 32 has a double cylindrical shape including a bottomed processing tank main body having an axial line extending in the vertical direction and a cylindrical inner wall 34 that is concentric with the processing tank main body and is erected inside. The space between the inner wall 34 and the outer wall 32a of the processing tank body is a processing space 33 in which granulation is performed. The inner wall 34 is rotatably arranged with respect to the processing tank main body. In addition, a plurality of protrusions 36 (two in this example) are disposed on the outer surface of the inner wall 34 in a triangular relation in plan view and projecting into the processing space 33 in a symmetrical relationship across the center of the processing tank 32. (See FIG. 2).

  The treatment tank 32 is opened upward, and an outlet 32b is opened at the bottom. The outlet 32b is always closed by a shielding plate 37a that can be slid by an operating mechanism 37b (see FIG. 4) such as a cylinder. (See FIG. 2). The granulation facility 30 moves the shielding plate 37a in the direction of opening the extraction port 32b by the operating mechanism 37b at an appropriate timing of the granulation process, and granulates from the processing space 33 of the processing tank 32 through the extraction port 32b. And the ungranulated material is delivered to the third conveyor 18. Also, above the processing tank 32, the first receiving unit 20 that receives the metal-containing by-product from the first conveyor 16 and transfers it to the processing tank 32, and the first receiving part that receives the reducing material from the second conveyor 17 and transfers it to the processing tank 32. 2 The receiving part 22, the water supply means 28 which supplies the measured water, the said several measuring device 26, and a dust collector (not shown) are arrange | positioned (refer FIG. 1). In addition, the upper part of the processing tank 32 is covered with a cover (not shown).

  The processing tank 32 includes a measuring means 38 for measuring the amount of the metal-containing byproduct and the reducing material charged by measuring the weight of the metal-containing byproduct and the reducing material charged in the processing space 33 (see FIG. 4). ), The metering means 38 is electrically connected to the control means 68. The control means 68 stops the first conveyor 16 or the second conveyor 17 based on the measurement of the metal-containing by-product or reducing material by the measuring means 38 and loads the processing space 33 with the required amount of metal-containing by-product or reducing material. It comes to enter. Thus, in the processing space 33 of the granulation facility 30, the dust measured by each measuring instrument 26, the metal-containing by-product and reducing material measured by the measuring means 38, and the water measured by the water supply means 28 Is inserted.

  Inside the inner wall 34 of the processing tank 32, a first rotation shaft 40 is erected so as to be rotatable at the center, and a lower portion of the first rotation shaft 40 is a first speed change mechanism 42 provided on the outer bottom of the processing tank 32. Is connected to a first motor 44 provided outside the processing tank 32 (see FIG. 3). The first motor 44 and the first transmission mechanism 42 are electrically connected to the control means 68 (see FIG. 4). An arm 46 extending in the radial direction of the processing tank 32 is provided on the upper portion of the first rotation shaft 40 in a symmetrical relationship with the first rotation shaft 40 interposed therebetween. The arm 46 is rotated along with the rotation of the first rotation shaft 40. Configured to rotate. Further, the arm 46 is extended in the radial direction of the processing tank 32 in a direction different from the extending direction of the arm 46, and a pair of first support arms 48, 48 are arranged symmetrically with the first rotation shaft 40 interposed therebetween. (See FIG. 2). Each first support arm 48 includes a blade 52 that rotates about the center of the processing tank 32 as the first rotating shaft 40 rotates, and a gap adjustment that adjusts the spacing of the blade 52 from the inner bottom surface 32c of the processing tank 32. A stirring body 50 including the mechanism 54 is provided in a suspended state (see FIG. 3 or FIG. 5).

  The blade 52 is a plate-like member disposed below the gap adjusting mechanism 54 in the stirring body 50 so as to extend in the radial direction of the processing tank 32. The blade 52 is installed in an inclined posture so as to be separated from the inner bottom surface 32c of the processing tank 32 from one side 52a along the radial direction of the processing tank 32 in the blade 52 toward the other side 52b opposite to the one side 52a. (See FIG. 5). The blade 52 is set so as to extend from the vicinity of the inner wall 34 of the processing tank 32 to a substantially intermediate portion between the inner wall 34 and the outer wall 32a (see FIG. 2).

  As shown in FIG. 5, the gap adjusting mechanism 54 swings in the circumferential direction of the processing tank 32 via a first bracket 54a connected to the first support arm side and the shaft portion 54b with respect to the first bracket 54a. The second bracket 54c is movably connected and includes a blade 52 at a lower portion thereof, and a stopper 54d that positions the second bracket 54c with respect to the first bracket 54a. Then, the gap adjusting mechanism 54 changes the mounting position of the stopper 54d and adjusts the downward angle of the second bracket 54c with respect to the first bracket 54a, whereby the inclination angle of the blade 52 with respect to the inner bottom surface 32c of the processing tank 32 and The separation interval can be changed. The spacing between the blade 52 and the inner bottom surface 32c of the treatment tank 32 is set in relation to the particle size of the metal-containing byproduct.

  The blade 52 is configured to be rotatable about the center of the processing tank 32 at an arbitrary direction and rotational speed by the first transmission mechanism 42 based on the control of the control means 68. Here, the rotation direction with the one side portion 52a of the inclined lower end of the blade 52 as the front side in the rotation direction is the forward direction, and the rotation direction with the other side portion 52b of the inclined upper end as the front side in the rotation direction is the reverse direction. The blade 52 rotates in the reverse direction at the first rotational speed in the initial stage of granulation in the granulation facility 30 and rotates in the forward direction at the second rotational speed set higher than the first rotational speed in the intermediate stage of granulation. In the final stage of granulation, it rotates in the positive direction at the second rotational speed. In this example, the first rotation speed is set to 7 rpm and the second rotation speed is set to 11 rpm.

  The arm 46 is provided with a rotor 56, a second motor 58, and a second motor 58 that are respectively suspended from both ends of the treatment tank 32 extending in the radial direction across the first rotation shaft 40. A second speed change mechanism 60 that transmits the rotation of 58 to the rotor 56 is provided (see FIG. 3). The second motor 58 and the second speed change mechanism 60 are electrically connected to the control means 68 (see FIG. 4). The rotor 56 rotates together with the blade 52 by the rotation of the arm 46 at the same speed as the blade 52 around the center of the processing tank 32, and in the same direction as the rotation of the blade 52 in the positive direction with respect to the arm 46. Configured to rotate. An inner wall 34 is attached to the lower surface of the arm 46, and the inner wall 34 and the protrusion 36 of the inner wall 34 rotate as the arm 46 rotates.

  The rotor 56 includes a second rotating shaft 56a whose upper part is connected to the second speed change mechanism 60, and a plurality of rotors 56 that are provided below the second rotating shaft 56a and extend outward in the radial direction of the second rotating shaft 56a. (See FIG. 2). The rotor 56 is provided with a plurality of blade sets 56 (in this example, four steps) in a vertical relationship with a plurality of blades 56b extending radially at the same height on the second rotating shaft 56a (see FIG. 4). 3). A plurality of protrusions 56 c that protrude toward the inner bottom surface 32 c of the processing tank 32 are provided on the lower surface of each blade 56 b that constitutes the lowermost blade set. The rotor 56 is configured such that the blades 56b pass through substantially the entire radial direction in the processing space 33 during rotation. And as shown in FIG. 6, the cross-sectional shape along the rotation direction of each blade | wing 56b is based on the rectangle which extended the long side in the direction along a rotation direction, and the rotation direction front side upper corner part has a rotation direction. A taper that is inclined downward from the rear side to the front side is formed.

  The rotor 56 is configured to rotate at an arbitrary rotation speed by the second speed change mechanism 60 based on the control of the control means 68. The rotor 56 rotates at the first rotation speed in the initial stage of granulation in the granulation facility 30, rotates at the second rotation speed set lower than the first rotation speed in the middle stage of granulation, and at the final stage of granulation. The motor rotates at a third rotation speed set lower than the second rotation speed. In this example, the first rotation speed is set to 241 rpm, the second rotation speed is set to 162 rpm, and the third rotation speed is set to 110 rpm.

  The arm 46 has a plurality of (two in this example) second support arms 62 extending along the radial direction of the processing bath 32 in a direction different from the extending direction of the arms 46 and the first support arms 48. The first rotating shaft 40 is disposed in a symmetrical relationship. A scraper 64 that extends along the inner surface of the outer wall 32 a of the processing tank 32 is provided at the tip of each second support arm 62. The scraper 64 is a member having a triangular cross-section projecting toward the center of the processing tank 32 in a plan view, and rotates along the inner surface of the outer wall 32a as the arm 46 rotates, and the mixture adhering to the inner surface of the outer wall 32a. It is supposed to be removed.

  In the granulation facility 30, the portion in contact with the metal-containing by-product, the mixture of dust and water is made of a wear-resistant metal material. As the wear-resistant metal material, for example, high-chromium steel or tungsten-based high-strength steel is employed. In this example, the bottom plate of the processing tank 32, the stirrer 50, the blades 56b of the rotor 56, the protrusions 36 of the inner wall 34, and the scraper 64 are made of a wear-resistant metal material.

  Next, the sizing equipment 70 will be specifically described with reference to FIGS. The sizing equipment 70 includes a hollow cylindrical body 74 installed on the pedestal 72 in a posture with the axis extending in the lateral direction, a rotating mechanism 82 that rotates the cylindrical body 74 in the circumferential direction, and tilts the cylindrical body 74. And a tilting mechanism 88. The sizing equipment 70 includes a control unit 94 to which the rotation mechanism 82 and the tilt mechanism 88 are electrically connected (see FIG. 9), and the rotational speed and tilt angle of the cylindrical body 74 are adjusted under the control of the control unit 94. It can be done.

  The cylindrical body 74 includes a first opening 76 opened on one side end surface (one side) 74a and a second opening 78 opened on the other side end surface (the other side) 74b. The first opening 76 and the second opening 78 communicate with each other through an internal space 77 that has a particle size adjusting process. In the first opening 76 of the cylindrical body 74, a transfer terminal portion of the third conveyor 18 that transfers the granulated material and the ungranulated material taken out from the granulation equipment 30 faces, and the first opening 76 passes through the first opening 76. Granulated material and non-granulated material are inserted into the internal space 77 from the third conveyor 18 (see FIG. 7). In addition, a chute 79 that receives the granulated material discharged from the second opening 78 faces the second opening 78, and is installed below the chute 79 between the sizing equipment 70 and the product yard 100. The transfer start end portion of the fourth conveyor 19 is arranged.

  In the internal space 77 of the cylindrical body 74, a plurality of (three in this example) weir members 80 projecting radially inward from the inner peripheral surface 74c of the cylindrical body 74 are disposed (see FIG. 8). The plurality of dam members 80 are disposed on the same circumference on the inner circumferential surface 74 c of the cylindrical body 74 in a state of being spaced apart from each other in the circumferential direction. In the cylindrical body 74, the weir member 80 prevents movement of the granulated material from the first opening 76 side to the second opening 78 side, while the first opening 76 side of the granulated material etc. through the gap. To the second opening 78 side is allowed. The weir member 80 is provided with a plate (not shown) for preventing the mixture containing water from adhering.

  The rotation mechanism 82 shifts the rotation of the third motor 84 by the third transmission mechanism 86 based on the control of the control unit 94 and transmits it to the cylindrical body 74, for example, in the range of 2 rpm to 20 rpm (preferably 10 rpm). The cylindrical body 74 is configured to rotate at a rotational speed. In the sizing process, the control unit 94 controls the third speed change mechanism 86 so that the rotational speed is gradually reduced or the rotational speed is gradually reduced.

  The tilt mechanism 88 is provided on the other side end face 74 b side of the cylindrical body 74, and a shaft support portion 90 that supports the cylindrical body 74 to be tiltable with respect to the pedestal 72, and on one side end face 74 a side of the cylindrical body 74. And an elevating part 92 including a cylinder or the like that elevates and lowers one side end face 74 a side with respect to the gantry 72. And by controlling the raising / lowering part 92 by the control part 94, the cylindrical body 74 is positioned in a horizontal posture in which the axial line extends in the horizontal direction, and one side end face 74a side is located above the other side end face 74b side. Tilt between tilted postures. Accordingly, the tilt angle of the cylindrical body 74 (angle formed by the horizontal plane and the axis of the cylindrical body 74) is appropriately adjusted in the range of 0 ° to 2 °. Here, in the initial stage of the sizing process, the sizing equipment 70 operates the cylindrical body 74 at an inclination angle of 1 ° close to 0 °, and gradually or gradually changes the inclination angle of the cylindrical body 74 as the sizing process proceeds. It is designed to be bigger.

  Next, a method for producing a granulated product of a metal-containing byproduct according to Example 1 shown in FIG. 10 using the granulation facility 30 will be described in the entire processing flow by the recycling plant 10. First, granulation pretreatment is performed on the treatment tank 32 of the granulation facility 30 such that the metal-containing by-product, the reducing material, and the dust material are measured and charged so as to have a predetermined ratio. After loading metal-containing by-products stored in a stock yard (not shown) into the first hopper 12 and removing excessive metal-containing by-products with a vibrating screen, the metal-containing by-products are transferred to the granulator 30 by the first conveyor 16. It is delivered to the first receiving unit 20 located above the processing tank 32. Then, the metal-containing by-product is charged into the processing tank 32 through the first receiving unit 20, and the first conveyor 16 is stopped based on the measurement of the metal-containing by-product received in the processing tank 32 by the weighing means 38. A predetermined amount of metal-containing by-product enters the treatment tank 32.

  The metal-containing by-product has a large particle size, and a granulated product cannot be formed by rolling granulation alone, and the proportion of the particle size of 1 mm or more is 70% of the total amount charged into the treatment tank 32. The thing in the range of the weight% or more is used. Here, the particle size in the present invention means the dimension of the longest part of the particle.

  On the other hand, the reducing material stored separately from the metal-containing by-product in the stock yard is charged into the treatment tank 32 via the second hopper 14, the second conveyor 17 and the second receiving portion 22. A predetermined amount of reducing material enters the processing tank 32 by stopping the second conveyor 17 based on the weighing of the reducing material by the measuring means 38. Note that the metal-containing by-product and the reducing material are weighed independently by the weighing means 38 by shifting the charging timing into the processing tank 32.

  The dust is pneumatically fed from the dust silo 24 through the corresponding transfer pipe 25 and transferred to the corresponding measuring device 26, and the set amount of dust is charged into the processing tank 32 by measuring with the measuring device 26. The Here, as the dust, dust collected when the metal raw material is melted in an electric furnace or the like, or dust collected in the steel making and steel material processing steps is used. As the dust, a dust having a small particle size and capable of being granulated alone and having a particle size ratio of 0.5 mm or less within the range of 95% by weight or more in the entire charging amount into the treatment tank 32 is used. It is done. Further, the dust is mixed with the metal-containing by-product so as to be a ratio of 20% by weight or more in the whole mixture. In addition, as the dust charged into the treatment tank 32, dusts having different components transferred from the plurality of dust silos 24 may be charged and mixed at an appropriate ratio, or a single dust may be charged. If the mixing ratio of the dust is less than 20% by weight, granulation itself cannot be performed, or even if granulation is completed, the strength of the granulated product is insufficient, and there is a possibility that it may easily collapse during transportation. That is, by setting the mixing ratio of dust to 20% by weight or more, it is possible to produce a granulated product having a crushing strength of 0.5 MPa or more without causing trouble in transportation. However, when the mixing ratio of dust is increased, the ratio of metal-containing by-products is reduced. Therefore, the upper limit of the mixing ratio of dust is preferably 50% by weight in consideration of the reuse rate of the by-products.

  The water is supplied by adjusting so that the mixture of metal-containing by-product and dust has a moisture content of 4 to 15% by weight. That is, when the metal-containing by-product contains moisture, water may not be supplied in the treatment tank 32. Here, when the moisture content is less than 4% by weight, only a granulated product having a small particle size can be formed, or granulation itself becomes difficult. In addition, about the supply order of a metal-containing by-product, dust, and water, after fully mixing a metal-containing by-product and dust, water is supplied.

  Thus, since the metal-containing by-product, the reducing material, the dust, and the water material are charged into the treatment tank 32 of the granulation facility 30 through the independent loading paths, the materials are not mixed in the loading process. Can be easily weighed for each material. That is, each material in the mixture can be accurately blended, and the granulated product can be efficiently formed by the granulation treatment in the subsequent step.

  In the granulation pretreatment, the mixture containing the metal-containing by-product, the reducing material, and the dust so as to have a required blending ratio is subjected to a granulation treatment in which the tumbling granulation is performed in the granulation facility 30 and the granulated product. Is done. The granulation process is roughly divided into three stages: an initial granulation stage in which the mixture is crushed and mixed; an intermediate granulation stage in which the mixture is granulated to form a granulated product; And a final stage of granulation to grow.

  In the initial stage of granulation, the blade 52 is rotated in the reverse direction at a low first rotation speed, and the rotor 56 is rotated at a high first rotation speed. By rotating the blade 52 in the reverse direction about the center of the processing tank 32, the blade 52 is inclined downward from the front side to the rear side in the rotation direction, and the force is exerted on the mixture toward the inner bottom surface 32c of the processing tank 32. Acts (see FIG. 5B). That is, the mixture is crushed by being sandwiched between the blade 52 and the inner bottom surface 32c of the treatment tank 32, so that the metal-containing by-product having a relatively large particle size can be crushed and made fine, and the metal-containing by-product, reducing material and dust can be reduced. Can be mixed and kneaded. Further, by rotating the blade 52 at a low first rotation speed, a force can be applied to the mixture for a long time, and crushing and kneading can be performed efficiently. Then, while rotating the rotor 56 at a high first rotation speed and rotating in the opposite direction around the center of the treatment tank 32 together with the blade 52, the mixture can be loosened and made fine while stirring. In this way, in the initial stage of granulation, by crushing and crushing the metal-containing by-product, it is possible to form grains that are the core of the granulated product and to make the particle size distribution of the mixture uniform. That is, in the granulation facility 30, the proportion of all the metal-containing by-products charged can have a particle size of 1 mm or more can be reduced from 70 wt% to 50 wt%. There is a large variation in the particle size of the metal-containing by-product collected in each step of the steel material manufacturing process, and those having a large particle size may not be a core during rolling granulation. Since the metal-containing by-product can be crushed to an appropriate particle size in the initial stage of granulation, it is not necessary to select and remove particles with a particle size of 1 mm or more, or to perform pretreatment for crushing large particles, simplifying the equipment. it can.

  In the middle stage of granulation, the water is supplied from the water supply means 28 to the treatment tank 32 so as to be in the range of 4 to 15% by weight of the entire mixture. In the middle stage of granulation, the blade 52 rotates in the forward direction at the second rotational speed set higher than the first rotational speed, and the rotor 56 rotates at the second rotational speed set lower than the first rotational speed. The By rotating the blade 52 in the forward direction around the center of the processing tank 32, the mixture is inclined upward from the inner bottom surface 32 c side of the processing tank 32 by the blade 52 inclined upward from the front side to the rear side in the rotation direction. (See Fig. 5 (a)). That is, the mixture begins to grow as a granular material in a process in which the mixture is peeled off from the inner bottom surface 32c of the processing tank 32 by the blade 52 and rolls on the upper surface of the blade 52 to come into contact with each other. Here, before the middle stage of granulation, the metal-containing by-product is crushed in advance in the initial stage of granulation to form grains serving as nuclei, so that the formation of the granular material is performed smoothly. In addition, the granular material is further consolidated by rolling, and excess moisture contained therein penetrates the surface of the grain. Small grains adhere to the surface of the granules and grow further. When the granular material becomes larger than the distance between the one side portion 52a of the blade 52 and the inner bottom surface 32c of the processing tank 32, a part of the granular material is pushed by the one side portion 52a of the blade 52 and Rolling on the bottom surface 32c, the other particulate matter is scraped up by the blade 52 and stirred. Further, the rotor 56 rotates at a medium second rotation speed set lower than the high-speed first rotation speed, and rotates in the forward direction around the center of the processing tank 32 together with the blade 52, thereby comparing the blades 56b. Large particles, small particles and a mixture are agitated to increase the chance of contact between them, and the particles can grow.

  In the middle stage of granulation, since the blade 52 and the rotor 56 are rotated at a second rotation speed that is set at a higher speed than the first rotation speed, there are many opportunities for contact between the mixture and the particulate matter in the processing tank 32. Can be provided. On the other hand, since the rotor 56 is set to rotate at a second rotation speed that is lower than the first rotation speed at which the mixture is crushed, the granule formed in the middle stage of granulation. It can stir with the blade | wing 56b, suppressing destruction of a thing.

  In the final stage of granulation, the blade 52 is rotated in the forward direction at the second rotation speed, and the rotor 56 is rotated at the third rotation speed set lower than the second rotation speed. In the final stage of granulation, the blade 52 and the rotor 56 are rotated in the forward direction around the center of the treatment tank 32, so that the mixture and the particulate matter are stirred by the rotor 56 as in the intermediate stage of granulation. Thus, while the mixture and the granular material are being scooped up from the inner bottom surface 32c side of the treatment tank 32, the granular material is rolled to achieve growth. In the final stage of granulation, since the granular material is somewhat large, the rotation speed of the rotor 56 is set to a lower third rotation speed that is further reduced than the second rotation speed in the middle stage of granulation, thereby reducing the blade 56b. Suppresses the destruction of the granular material due to. However, the granulated material that has become too large at the final stage of granulation is divided into small granular materials by the blades 56b by the rotation of the rotor 56, and the granular materials are again adsorbed and grown.

  The granulated material formed after the final stage of granulation in the granulating facility 30 and the ungranulated material that has not reached the granulated material are transferred by the third conveyor 18 and are cylindrical body 74 of the granulating facility 70. Is inserted through the first opening 76. The granulated material and the ungranulated material charged in the cylindrical body 74 roll on the inner peripheral surface 74c of the cylindrical body 74 by rotating the cylindrical body 74 in the circumferential direction by the rotation mechanism 82. The granulated products or the ungranulated product and the granulated product are brought into contact with each other and joined together. Further, since the cylindrical body 74 is tilted by the tilting mechanism 88 with the other side end face 74b as the tilted lower end, the granulated material and the ungranulated material are separated from the first opening 76 side on the charging side. It moves while rolling in the circumferential direction toward the two openings 78. Here, since the rotational speed of the cylindrical body 74 is set to a high speed in the initial stage of the sizing treatment, the sizing equipment 70 has an opportunity to contact the ungranulated materials or between the ungranulated material and the granulated material. It can be increased, and smooth growth to a granulated product can be achieved. And since the sizing equipment 70 reduces the rotational speed of the cylindrical body 74 gradually or in steps as the sizing process proceeds, it suppresses the decomposition of the granulated product due to the collision between the granulated products. be able to.

  Since the sizing equipment 70 controls the tilting mechanism 88 so that the tilting angle of the cylindrical body 74 becomes small at the initial stage of the sizing process, the stagnation of the granulated material and the ungranulated material in the cylindrical body 74 is maintained. The time can be lengthened. That is, it is possible to suppress the ungranulated material from being released from the second opening 78. Then, the sizing equipment 70 appropriately releases the grown granulated material from the second opening 78 by gradually or gradually increasing the tilt angle of the cylindrical body 74 as the sizing process proceeds. Can do. In addition, since a plurality of dam members 80 are erected on the inner peripheral surface 74c of the cylindrical body 74, the movement of the granulated material and the ungranulated material is prevented by these dam members 80, and the granulated material and The residence time of ungranulated material can be earned.

  In this way, the ungranulated material grows up to the granulated material by the granulation processing by the granulation equipment 70, and the obtained granulated material is delivered to the fourth conveyor 19 through the second opening 78 and the chute 79. The product is transferred by the fourth conveyor 19 and stored in the product yard 100.

  In the method for producing a granulated product of a metal-containing byproduct described above, the ratio of the granulated product having a particle size of 5 mm or more with good handleability among all the granulated products rolled and granulated by the granulation equipment 30 is 50% or more. The obtained granulated product has a crushing strength of 0.5 MPa or more which does not collapse during transportation. Moreover, since the granulation equipment 30 for rolling granulation is less expensive than the briquette machine described in the conventional example, the production cost of the granulated product can be reduced.

  According to the granulation facility 30, the metal-containing by-product having a large particle size is included by changing the rotation direction and rotation speed of the blade 52 and the rotation speed of the rotor 56 as described above in accordance with the formation stage of the granular material. Even in this case, a granulated product can be formed. In other words, the metal-containing by-product is crushed by the blade 52 at the initial stage of granulation to form particles that become the core of the granular material, so there is no need to add a binder such as plastic, a coagulant, an adsorbent, etc. However, a granulated product can be formed even if it contains a metal-containing byproduct having a large particle size. In addition, since the metal-containing by-product can be crushed, mixed, kneaded and granulated with one granulation facility 30, labor for the facility and crushing treatment can be reduced. Furthermore, the obtained granulated material is not hardened on the surface by the action of a coagulant or an adsorbent, but is formed by repeated adsorption and consolidation of particles in rolling granulation, Is excellent. Therefore, the obtained granulated product is difficult to decompose, has excellent handleability, and can be prevented from collapsing in the middle of conveyance, so that the recycling efficiency of the metal-containing byproduct can be improved. Thus, according to the granulation equipment 30, a granulated material can be formed from a metal-containing by-product at low cost.

  In the granulation process, as the blade 52 and the rotor 56 rotate, the inner wall 34 of the processing tank 32 rotates about the center of the processing tank 32, so that the mixture on the inner wall 34 side is projected by the protrusion 36 installed on the inner wall 34. Or a granular material is extruded to the outer wall 32a side. Further, along with the rotation of the blade 52 and the rotor 56, the scraper 64 rotates along the outer wall 32 a around the center of the processing tank 32, whereby the mixture or granular material on the outer wall 32 a side is pushed out to the inner wall 34 side. As a result, the entire mixture and granular material charged into the processing space 33 of the processing tank 32 can be uniformly crushed and stirred by the blades 56b of the rotor 56, and therefore, crushing, mixing, kneading and rolling by the blade 52 can be performed. Can be done evenly. That is, the time for the granulation treatment can be shortened, and the conversion rate of the metal-containing byproduct charged into the treatment tank 32 into the granulated product can be increased, so that the recycling efficiency of the metal-containing byproduct can be further improved.

  The granulation facility 30 is composed of a wear-resistant metal material at a portion where the mixture and the granular material come into contact with each other. Therefore, even if the granulation facility 30 is hard such as a metal-containing byproduct containing a large amount of metal such as iron, the blade 52, Wear and damage to the rotor 56, the outer wall 32a and the inner wall 34 of the processing tank 32, the protrusion 36 of the inner wall 34, the scraper 64, or the like can be suppressed. That is, the life of the granulation facility 30 can be improved and the labor of maintenance can be reduced.

  Here, depending on conditions, the whole mixture may not be made into a granulated product by the granulating treatment of the granulating facility 30. According to the sizing equipment 70, the non-granulated material made of a granular material or a mixture of ungranulated particles that has not been grown to a size that is easy to handle and is taken out from the granulating equipment 30 is put together with the granulated material into the cylindrical body 74. By inserting and rolling the inner peripheral surface of the cylindrical body 74, the ungranulated material or the ungranulated material and the granulated material can be adsorbed and bonded. In other words, since an ungranulated product with poor handleability to be reused in the steelmaking process can be made into a granulated product by the granulating equipment 70, the recycle efficiency of the metal-containing by-product can be improved and the handleability is improved. Can do. In addition, the granulation of the granulation product can be further consolidated by the granulation treatment of the granulation facility 70, and the strength of the granulation product can be increased to improve the handleability.

[Experimental Example 1]
About the granulated product manufacturing method of the metal-containing by-product of Example 1, as a metal-containing by-product, the scarf scale which mainly occurred in the manufacturing process of general special steel system, and Fe: 67 weight% and Fe: 69 weight% were used. Using oxide scale with the main component as well as smelting furnace dust with 25% by weight of Fe as the main component, also generated as a dust in the production process of general special steels, using 7% by weight of SiC as the reducing material, moisture Comparative Example 1 in which the mixing ratio of the raw materials and dusts of the first invention examples 1 to 5 in which the metal-containing by-product and dust were mixed at the mixing ratio shown in FIG. About the granulated material obtained by rolling granulation of 2 raw materials, the ratio of the granulated material with a particle size of 5 mm or more with respect to the whole manufactured granulated material is shown in FIG. Using the granulation facility 30 described above, the metal-containing by-product, dust and reducing material are charged into the treatment tank 32, and after performing the initial stage of granulation for 90 seconds, water is added and the intermediate stage of granulation is performed for 60 seconds. The granulated product was rolled and granulated by performing the final stage of granulation for 180 seconds. Here, the first rotation speed is 7 rpm, the second rotation speed is set to 11 rpm, the first rotation speed is 241 rpm, the second rotation speed is 162 rpm, and the third rotation speed is set to 110 rpm. Moreover, while showing the crushing strength of the manufactured granulated material in FIG. 13, the drop strength of the granulated material is shown in FIG. The crushing strength is indicated by the maximum compressive load when the granulated material breaks using a uniaxial compression measuring instrument, and the drop strength is obtained when the granulated material is freely dropped onto a concrete floor from a height of 2 m. Shown as undestructed rate.

  In addition, as a metal-containing by-product, a SUS scale generated in a SUS-based manufacturing process, mainly composed of Fe: 60% by weight, Ni: 2.8% by weight, Cr: 5.2% by weight, is used as dust. Similarly, electric furnace dust mainly composed of Fe: 30% by weight, Ni: 1.5% by weight, Cr: 7% by weight, which is generated in the SUS manufacturing process, is used to contain 45% by weight of metal-containing by-products and 45% of dust. Regarding the granulated product of the first invention example 6 in which 10% by weight of SiC and 6% by weight of SiC are mixed, the ratio, the crushing strength, and the drop strength of the granulated product having a particle size of 5 mm or more with respect to the entire granulated product are shown in FIGS. 14 shows. 12 to 14, the first invention example 6 is indicated by a black circle in order to distinguish from the examples shown in FIG. 11.

  From Experimental Example 1, when the metal-containing by-product and the material of the dust are either general steel type or SUS type, any of the first invention examples 1 to 5 and 6 in which the mixing ratio of the dust is more than 20% by weight It was confirmed that the ratio of the granulated product having a diameter of 5 mm or more was 50% or more. Further, the crushing strengths of the first invention examples 1 to 5 and 6 were 0.5 MPa or more, the drop strength was 80% or more, and none of them collapsed during transportation or the like, and a high value with no practical problem was obtained. . However, in Comparative Examples 1 and 2 in which the mixing ratio of dust is less than 20% by weight, granulation itself cannot be performed.

  In the method for producing a granulated product of a metal-containing byproduct according to Example 2, in addition to the metal-containing byproduct and dust described above, the agglomerated material is charged into the granulation facility 30, and moisture is added. A granulated product is produced by rolling granulation. As the aggregating material, PAC (polyaluminum chloride), a solidifying material (bentonite, cement, quicklime, starch, etc.) having an aggregating effect is used. Moreover, the addition ratio of the aggregate is set in the range of 0.5 to 5% by weight. If the addition ratio of the aggregating material is less than 0.5% by weight, the aggregating effect cannot be obtained, and if it exceeds 5% by weight, the aggregating effect is saturated. In addition, the water | moisture content of the granulated material was the range of 4 weight%-15 weight%. The operation method of the granulation facility 30 is the same as that in the first embodiment.

  By adding an aggregating material as in Example 2, a granulated product having a particle size of 5 mm or more with good handleability among all the granulated products granulated by the granulation equipment can be obtained. In particular, when PAC and bentonite are used, the ratio of the granulated product having a particle size of 5 mm or more in the entire granulated product is increased (50% or more), and the handling property is further improved. In addition, the obtained granulated product has a crushing strength of 0.5 MPa or more which does not collapse during transportation. In addition, since the granulation equipment for rolling granulation is less expensive than the briquette machine, the production cost of the granulated product can be reduced. In addition, when the aggregate is added, granulation is possible even if the mixing ratio of the dust is less than 20% by weight, and the reuse rate of the metal-containing byproduct can be increased. In addition, when water glass is added as an agglomerate during rolling granulation in a granulation facility, the strength of the granulated product is further improved. In particular, when a metal-containing byproduct having a heat-generating component such as CaO and dust are used as raw materials, the effect of improving strength by adding water glass is high.

[Experimental example 2]
About the method for producing a granulated product of a metal-containing byproduct of Example 2, using a metal-containing byproduct of a general special steel system and dust having the same composition as used in Experimental Example 1, using SiC as a reducing material and PAC as an aggregating material, On the premise that the moisture is mixed at 10% by weight, the entire granulated product produced by the granulation obtained by rolling and granulating the raw materials of the second invention example 1 and the second invention example 2 having the mixing ratio shown in FIG. The result of having measured the ratio and crushing strength of the granulated material with a particle size of 5 mm or more with respect to FIG. 17 is shown. Further, as the agglomerates, the experimental results of the second invention example 3 using bentonite, the second invention example 4 using cement, the second invention example 5 using quicklime and the second invention example 6 using starch are shown. As shown in FIG. However, the mixing ratio of each material of the second invention examples 3 to 6 is shown in FIG. In addition, in the experimental result of each example shown in FIG. 17, the ratio part of a particle size larger than 10 mm is attached | subjected hatching among the things whose particle size shown by a bar graph is 5 mm or more. The crushing strength was measured by the same method as in Experimental Example 1.

  Furthermore, SUS-based metal-containing by-products and dust having the same composition as used in Experimental Example 1 were used. Metal-containing by-products were 45% by weight, dust was 45% by weight, SiC was 10% by weight, and PAC was 0.5% as an aggregate. FIG. 17 shows the result of measuring the ratio and the crushing strength of the granulated product having a particle diameter of 5 mm or more with respect to the entire manufactured granulated product with respect to the granulated product of the second invention example 7 blended in weight%. Furthermore, using the same general steel-based metal-containing by-product, dust and reducing material as in the second invention example (see FIG. 16 for the blending ratio), the granulated products of Comparative Examples 3 and 4 in which no aggregating material is added are produced. The result of having measured the ratio and crushing strength of the granulated material with a particle size of 5 mm or more with respect to the whole manufactured granulated material is shown in FIG.

  From Experimental Example 2, when the metal-containing by-product and the material of the dust are either general steel type or SUS type, a granulated product having a particle size of 5 mm or more can be obtained by adding an agglomerate, and the crushing strength is also as follows. A high value of 0.5 MPa or more that did not collapse during transportation or the like was obtained. Further, by adding the aggregating material from the comparison between the second invention example 2 to which the agglomerated material (PAC) was added and the comparative example 4 to which the agglomerated material (PAC) was added with the same mixing ratio of the metal-containing by-product, dust, and SiC, It was confirmed that the ratio of the granulated product having a particle size of 10 mm or more in the entire granulated product having a diameter of 5 mm or more was increased. As for the agglomerated material, when the mixing ratio of the dust is more than 20% by weight, it is confirmed that the ratio of the granulated product having a particle diameter of 5 mm or more can be set to 50% or more by using PAC or bentonite. In addition, a sufficient amount of PAC can be obtained with a smaller amount of use than bentonite, and an effect of reducing material cost can be expected.

The embodiment described above can be further modified as follows.
(1) In the examples, the granulated product formed by the granulation facility and the ungranulated product that has not reached the granulated product were grown by the granulation facility, but the granulation facility can be omitted.
(2) The sizing equipment of the example has openings on both end faces, but the opening on the side of taking out the granulated material is on the peripheral surface (side part) at a position biased to the other side end face side. It may be provided.

It is a schematic plan view which shows the recycling plant provided with the granulation equipment used for the granulated material manufacturing method of the metal-containing by-product which concerns on suitable Example 1 and 2 of this invention. It is a top view which shows the granulation equipment shown in FIG. It is the sectional view on the AA line of FIG. It is a control block diagram of the granulation equipment shown in FIG. In the granulation equipment shown in Drawing 3, it is a side view expanding and showing a blade, (a) is a case where it rotates in the forward direction, (b) shows a case where it rotates in the reverse direction. It is the BB sectional drawing of FIG. 2 which expands and shows the blade | wing of a rotor. FIG. 2 is a side view of the sizing equipment shown in FIG. It is CC sectional view taken on the line of FIG. It is a control block diagram of the sizing equipment shown in FIG. It is the schematic explaining the granulated material manufacturing method of the metal-containing by-product which concerns on Example 1. FIG. It is a figure which shows the mixing ratio of each example in Experimental example 1. FIG. It is a graph which shows the relationship between the mixing ratio of the dust in Experimental example 1, and the ratio of the granulated material with a particle size of 5 mm or more with respect to the whole granulated material. It is a graph which shows the relationship between the mixing ratio of the dust in Example 1, and crushing strength. It is a graph which shows the relationship between the mixing ratio of dust in Example 1, and drop strength. It is the schematic explaining the granulated material manufacturing method of the metal-containing by-product which concerns on Example 2. FIG. It is a figure which shows the mixing ratio of each example in Experimental example 2. FIG. It is a graph which shows the experimental result of each example in Experimental example 2. FIG.

Explanation of symbols

32 treatment tanks, 32c inner bottom surface (bottom surface), 38 weighing means, 52 blades,
52a One side, 52b Other side, 56 Rotor, 68 Control means

Claims (5)

Generated in steel production process, a mixture obtained by mixing a metal-containing by-products and dust in the range ratio is more than 70 wt% of the particle diameter of more than 1mm in a processing tank (32), the hydrated metal products becomes finer So that it is crushed in the treatment tank (32),
A granulated product is produced by rolling and granulating a mixture having a moisture content in the range of 4% by weight to 15% by weight in the treatment tank (32) while containing 20% by weight or more of dust. A method for producing a granulated product of a metal-containing byproduct. The method for producing a granulated product of a metal-containing byproduct according to claim 1, wherein an aggregating material is mixed with the mixture . The method for producing a granulated product of a metal-containing byproduct according to claim 1 or 2 , wherein the dust has a ratio of a particle size of 0.5 mm or less in a range of 95 wt% or more. A granulation facility used in the method for producing a granulated product of a metal-containing byproduct according to any one of claims 1 to 3 ,
Metallized products generated in the steel production process, the processing bath cylindrical dust and additive and water is charged with (32),
From the bottom surface (32c) of the processing tank (32) from the one side part (52a) extending in the radial direction of the processing tank (32) toward the other side part (52b) facing the one side part (52a) It is installed inside the processing tank (32) in an inclined posture to be separated, and the positive side and the other side part (52b) with the one side part (52a) as the front side in the rotation direction with the center of the processing tank (32) as an axis. A blade (52) that rotates in the reverse direction with the front side of the rotation direction,
A rotor that rotates in the same direction as the forward direction of the blade (52) while rotating in the forward and backward directions around the center of the processing tank (32) together with the blade (52) as an axis ( 56)
Control means (68) for controlling the rotation speed of the rotor (56), the rotation direction and the rotation speed of the blade (52),
The control means (68)
In the initial stage of granulation, the blade (52) is rotated in the reverse direction at the first rotational speed, and the rotor (56) is controlled to rotate at the first rotational speed , whereby the metal-containing byproduct, dust and Mixing the additive and crushing the metal-containing by-product ,
In the middle stage of granulation, the blade (52) was rotated in the positive direction at a second rotational speed set higher than the first rotational speed, and the rotor (56) was set lower than the first rotational speed. By controlling to rotate at the second rotation speed, a granulated product is formed from the mixture,
At the final stage of granulation, the blade (52) is rotated in the forward direction at the second rotation speed, and the rotor (56) is rotated at a third rotation speed set lower than the second rotation speed. A granulation facility used in a method for producing a granulated product of a metal-containing byproduct, wherein the granulated product is grown by controlling the granulated product. The method for producing a granulated product of a metal-containing byproduct according to claim 4 , wherein the portion of the treatment tank (32) in contact with the metal-containing byproduct, the blade (52) and the rotor (56) are made of a wear-resistant metal material. Granulation equipment used for

Images