KR20090064785A - Manufacturing method of binderless briquette and apparatus for manufacturing same - Google Patents

Abstract

The present invention relates to a method for producing a binderless briquette and an apparatus for producing the same. The method for producing a binderless briquette includes the steps of: i) dry dust collecting exhaust gas discharged during iron ore drying to collect dust; ii) reducing furnace for reducing iron dried iron ore and melting reduced iron to melt molten iron. Providing the reduced ore discharged from the molten iron manufacturing apparatus comprising a molten gasifier to be prepared, iii) providing a mixture of dried and mixed dust and reduced ore, and iv) molding the mixture without using a binder Preparing a binderless briquette.

Description

Manufacturing method and apparatus for manufacturing the binderless briquette {METHOD FOR MANUFACTURING BINDERLESS BRIQUETTES AND APPARATUS FOR MANUFACTURING THE SAME}

The present invention relates to a method for producing a binderless briquette and a manufacturing apparatus thereof, and more particularly, to a method for producing a binderless briquette using dust or reduced light generated during molten iron production and the like.

Many different by-products occur in the molten iron manufacturing process. By-products contain carbon or iron, so recycling them can greatly reduce raw material costs. By-products include dust or reduced ore.

Dust is recycled from the molten iron manufacturing process where the cement is made into pellets using a binder. However, since cement is used as a binder, curing is necessary after pellet production, and a large amount of slag is generated when pellets are used in a blast furnace.

An object of the present invention is to provide a method for manufacturing a binderless briquette using dust or reduced light generated in a molten iron manufacturing process. It is also an object of the present invention to provide a binderless briquette manufacturing apparatus.

Method for producing a binderless briquette according to an embodiment of the present invention, i) providing a dust collected by collecting the dry exhaust gas discharged during iron ore drying, ii) reduction to reduce the reduced iron ore reduced iron Providing a reduced ore discharged from the molten iron manufacturing apparatus including a molten gasifier for melting molten iron and reduced iron to produce molten iron, iii) providing a mixture of dried and mixed dust and reduced ore, and iv) a binder Shaping the mixture without using to prepare a binderless briquette.

In the step of providing reduced light, the reduced light may be provided by drying and particle size screening. The reduced ore may contain 10 wt% to 30 wt% of moisture before drying and particle size sorting. The reduction rate of the reduced ore may be 30% to 60%. The reduced ore is divided into granular reduced or fine granulated reduced ore, the granulated reduced ore can be charged into the melt gasifier. The particle size of the granulated reduced ore may be 8 mm or more.

In the step of preparing the binderless briquette, the molding pressure when molding the mixture may be 6t / cm to 10t / cm. In the step of providing the mixture, the moisture content of the reduced ore may be greater than zero and up to 6 wt%. In the step of providing the mixture, the particle size of the reduced light may be 1mm to 5mm. In providing the mixture, the amount of dust in the mixture may be greater than zero and less than or equal to 50 wt%. In the step of providing reduced light, the reduced light may be provided from a reduction furnace.

In the step of providing a reduced ore, the molten iron manufacturing apparatus further includes a compacted material manufacturing apparatus for supplying a compacted material produced by interconnecting the reducing furnace and the molten gasifier and compressing the reduced iron discharged from the reducing furnace to the molten gasifier. The reduced light may be provided from the compacted material manufacturing apparatus. In the step of preparing a binderless briquette, the strength of the binderless briquette may be 80 kgf / p to 100 kgf / p. In the step of providing a reducing ore, the reducing furnace may be a fluidized bed reduction furnace or a packed bed reduction furnace.

In the binderless briquette manufacturing apparatus according to an embodiment of the present invention, i) a dust hopper for storing dust collected by dry dust collecting exhaust gas discharged during iron ore drying, and ii) reducing iron for reducing dried iron ore. A reduced ore hopper for storing the reduced ore discharged from the molten iron manufacturing apparatus including a molten gasifier for melting molten iron and reduced iron to produce molten iron; iii) connected to the dust hopper and the reduced ore hopper, and drying the dust and reduced ore; A mixer providing a mixed mixture, and iv) a pair of forming rolls for molding the mixture to provide a binderless briquette.

The mixer may comprise i) a casing and ii) a screw-like member extending and rotating in one direction within the casing. Binderless briquette manufacturing apparatus according to an embodiment of the present invention, i) drying the reduced ore, and ii) interconnecting the dryer and the reduced ore hopper, and the dried reduced ore to the fine reduced ore and granulated reduced ore It may further include a particle size selector for selecting the particle size. The dryer may be a rotary kiln.

The particle size of the granulated reduced ore may be 8 mm or more. The coarse reducing ore can be charged to the melt gasifier. The dryer may dry the reduced ore containing 10 wt% to 30 wt% of moisture. The reduction rate of the reduced ore may be 30% to 60%. The pair of forming rolls may mold the mixture at a molding pressure of 6 t / cm to 10 t / cm. The moisture content of the reduced ore may be greater than 0 and less than or equal to 6 wt%. The particle size of the reduced light may be 1mm to 5mm. The amount of dust in the mixture can be greater than zero and up to 50 wt%.

The reduction furnace can supply the reduced light to the reduced light hopper. The molten iron manufacturing apparatus further includes a compacted material manufacturing apparatus for interconnecting a reducing furnace and a molten gasifier and supplying a compacted material produced by compressing the reduced iron discharged from the reducing furnace to the molten gasifier, and the reduced ore is manufactured from compacted material. It may be supplied from the device to the reducing light hopper. The strength of the binderless briquette may be 80 kgf / p to 100 kgf / p. The reduction furnace may be a fluidized bed reduction furnace or a packed bed reduction furnace.

By-products such as dust, sludge or reduced ore generated during the production of molten iron can be recycled to the molten iron manufacturing apparatus itself, thereby minimizing the cost of raw materials. In addition, since the high-temperature strength of the briquette manufactured by using dust, sludge or reduced light, etc. is high, it is possible to charge molten gas into a molten gas furnace to produce molten iron.

With reference to the accompanying drawings, it will be described embodiments of the present invention to be easily implemented by those skilled in the art. As can be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible the same or similar parts are represented with the same reference numerals in the drawings.

All terms including technical terms and scientific terms used below have the same meaning as those commonly understood by those skilled in the art. Terms defined in advance are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

The binderless briquette used hereinafter means a briquette prepared without adding a binder. Thus briquettes are prepared without the addition of a binder arbitrarily.

1 schematically shows a binderless briquette manufacturing apparatus 10 according to an embodiment of the present invention.

As shown in FIG. 1, the binderless briquette manufacturing apparatus 10 includes a reduced light hopper 101, a dust hopper 102, a mixer 108, and a molding machine 110. In addition, if necessary, the binderless briquette manufacturing apparatus 10 further includes a particle size selector 105 and storage bins 106 and 107.

The reduced light hopper 101 is supplied with and stored with the reduced light discharged from the molten iron manufacturing apparatus 1000 (shown in FIG. 2). Reduced light is also called remet. Reduced ore means reduced iron ore. The reduced ore may be iron ore which has been fully reduced or partially reduced.

The reduction rate of the reduced ore may be 30% to 60%. If the reduction rate of the reduced ore is less than 30% or more than 60%, it is difficult to produce a binderless briquette. Reduced ore is produced by reducing iron ore or aggregating reduced ring iron during molten iron production. The reduced ore is partially reduced during the production of molten iron and then oxidized again in the cooling process, and thus has a reduction ratio in the above-described range.

The reduced light is discharged from different apparatuses in the molten iron manufacturing apparatus 1000 (shown in FIG. 2). Therefore, the reduced ore is discharged from different devices and mixed, so that the particle size is not uniform and the water content is relatively high. Therefore, reduced ore cannot be used directly as a raw material for producing binderless briquettes. The reduced ore is therefore dried and sized before the binderless briquettes are manufactured.

Dust is supplied to and stored in the dust hopper 102. Dust is produced by drying iron ore or by transporting iron ore. More specifically, the dust may be collected by dry dust collecting the exhaust gas discharged during iron ore drying. Dust is collected and supplied to the dust hopper 102 by the above-mentioned method.

As described above, rather than stacking the reduced ore or dust discharged from the molten iron manufacturing apparatus 1000 (shown in FIG. 2) in the yard, the binderless briquettes are directly manufactured by using the reduced ore dust as described above. By reusing itself, the efficiency of raw material utilization can be maximized.

As shown in FIG. 1, a rotary kiln is used as the dryer 104. Other types of dryers may also be used. The dryer 104 dries the reduced light charged into the dryer 104 using hot air. That is, the dryer 104 rotates in the direction of the arrow and hot air is supplied therein. The reduced light is charged in the dryer 104 and then dried and discharged by hot air.

The moisture content of the reduced ore is controlled by controlling the temperature of the hot air. The reduced ore contains 10 wt% to 30 wt% of moisture before it is discharged from the molten iron manufacturing apparatus 1000 (shown in FIG. 2) and dried. If the reduced ore contains too little moisture, the strength of the briquettes becomes weak and briquettes are likely to break. In contrast, when the reduced ore contains too much moisture, the reduced ore is in the form of a slurry, making briquettes difficult. Therefore, the dryer 104 is used to appropriately adjust the water content of the reduced ore.

As shown in FIG. 1, the dried reduced light is transferred to the particle size sorter 105. The particle size sorter 105 is connected to the dryer 104 to sort the reduced light. The particle size of the reduced ore emitted from the molten iron manufacturing apparatus 1000 (shown in FIG. 2) is nonuniform. Therefore, the particle size of the reduced ore is uniformly adjusted using the particle size selector 105.

The particle size selector 105 sorts the dried reduced ore into fine grain reduced or granulated reduced ore. For example, reduced ore having a particle size of 8 mm or more based on a particle size of 8 mm is selected as coarse reduced ore, and reduced ore having a particle size of less than 8 mm is selected as fine grained ore. Here, the granulated reduction ore is too large to be used as a raw material for the binderless briquette, which is inappropriate. Therefore, the granulated reduction ore is directly charged into the melt gasifier. Since the structure of the particle size selector 105 can be easily understood by those skilled in the art, detailed description thereof will be omitted.

As shown in FIG. 1, fine-grained reduced light is supplied to and stored in the reduced-light storage bin 106, and dust is supplied to and stored in the dust storage bin 107. The reduced ore dust is discharged from the reduced ore storage bin 106 and the dust storage bin 107, respectively, and transferred to the mixer 108.

As shown in FIG. 1, the mixer 108 includes a casing 1081 and a screwed member 1083. Screwed member 1083 extends and rotates in one direction in casing 1081. Therefore, the screw-shaped member 1083 transfers the reduced light and dust discharged from the reduced light storage bin 106 and the dust storage bin 107 to the molding machine 110 side, respectively. Reduced light and dust are dried by the mixer 108.

The mixer 108 can simultaneously perform drying, mixing, and transfer of the reduced light and dust, so that the process time can be greatly shortened. The reduced light and dust are uniformly mixed in the mixer 108.

As shown in FIG. 1, the mixture in which the reduced light and the dust are dried and mixed is transferred to the molding machine 110. The molding machine 110 includes a hopper 1100, a screw 1102, and a pair of forming rolls 1104. In addition, the molding machine 110 may further include a hydraulic device (not shown) and a load cell (not shown) installed on the pair of forming rolls 1104 to mold the mixture at a constant pressure.

The mixture is charged to hopper 1100 and temporarily stored. The screw 1102 forcibly loads the mixture temporarily stored in the hopper 1100 between the pair of forming rolls 1104 while rotating in the direction of the arrow. The pair of forming rolls 1104 cold form the mixture while rotating in opposite directions to produce a briquette.

A screw 1102 is installed in the molding machine hopper 1100 to force the mixture into the pair of forming rolls 1104. The mixture is charged in the gap formed between the pair of forming rolls 1104 and the pair of forming rolls 1104 rotate to produce briquettes. The prepared binderless briquette may be charged to a molten gasifier again and used for manufacturing molten iron. Due to the reducing power of the reduced ore, the reduced ore is well combined with the dust. Therefore, a binderless briquette having a constant compressive strength can be manufactured.

FIG. 2 illustrates an apparatus 1000 for manufacturing molten iron through which the reduced light of FIG. 1 discharges raw materials of a binderless briquette.

As shown in FIG. 2, the molten iron manufacturing apparatus 1000 includes a fluidized bed reduction furnace 20, a compacted body manufacturing apparatus 30, a melt gasifier 60, a reducing gas supply pipe 70, and an ore drying unit. And 80. In addition, the molten iron manufacturing apparatus 1000 further includes a high temperature uniform back pressure device 40 and a storage tank 50. The molten iron manufacturing apparatus 1000 may further include other apparatus as necessary.

As shown in FIG. 2, the ore drying unit 80 dries the iron ore charged in the fluidized-bed reduction furnace 20. When the moisture content of the iron ore is large, the iron ore may stick to the inside of the fluidized bed reduction furnace 20 without flowing. Therefore, iron ore flows well in the fluidized-bed reduction reactor 20 by pre-drying the iron ore in the ore drying unit 80.

As shown in FIG. 2, the fluidized-bed reduction reactor 20 includes a first flow reduction path 20a, a second flow reduction path 20b, a third flow reduction path 20c, and a fourth flow reduction path 20d. ). The first flow reduction path 20a, the second flow reduction path 20b, the third flow reduction path 20c, and the fourth flow reduction path 20d are sequentially connected. The fluidized bed reduction furnace 20 receives the reducing gas from the molten gasifier 60 through the reducing gas supply pipe 70 to reduce the iron ore. The first flow reduction path 20a receives the dried iron ore from the ore drying unit 80 and preheats the iron ore by reducing gas. The second flow reduction path 20b and the third flow reduction path 20c preliminarily reduce the preheated iron ore. In addition, the fourth flow reduction reactor 20d is finally reduced to reduce the iron ore to produce a reduced reduction iron.

The fluidized bed reduction furnace 20 transfers the reduced iron to the compacted material manufacturing apparatus 30. The compacted material manufacturing apparatus 30 compacts a ring-reducing iron. When the ring reducing iron is directly charged into the melt gasifier 60, the ring reducing iron is scattered to the outside by the reducing gas inside the melt gasifier 60. In addition, when the reducing iron is directly charged into the melt gasifier 60, the air permeability inside the melt gasifier 60 may be deteriorated. Therefore, the reduced-reduced iron is produced as a compacted body by the compacted body manufacturing apparatus 30 and then supplied to the molten gasifier 60.

As shown in FIG. 2, the compacted material manufacturing apparatus 30 includes a storage tank 301, a pair of rolls 302, a crusher 304, and a compacted material storage tank 306. The storage tank 301 temporarily stores the ring-shaped raw iron. The ring-reducing iron is discharged from the reservoir 301 and made into a strip compacted material by a pair of rolls 302. The crusher 304 is manufactured to a predetermined size by crushing the compacted body. The crushed compacts are stored in the compacted material reservoir 306.

The high temperature uniform back pressure device 40 interconnects the compacted material manufacturing device 30 and the reservoir 50. The high temperature uniform pressure-reducing device 40 adjusts the pressure between the compacted material manufacturing device 30 and the storage tank 50 to feed the compacted material from the compacted material manufacturing device 30 to the storage tank 50. The storage tank 50 stores the compacted material, and supplies the compacted material to the melt gasifier 60.

The compacted material is charged into the melt gasifier 60 and melted. The bulk carbonaceous material is charged into the melt gasifier 60 to form a coal filling layer therein. Here, the lump coal material may be lump coal or coal briquettes. By blowing oxygen into the melt gasifier 60, the coal packed layer is burned, and the compacted material is melted by the heat of combustion of the coal packed bed. The compacted material is melted and made of molten iron and then discharged to the outside. The reducing gas generated from the coal packed bed is supplied to the fluidized-bed reduction furnace 20 through a reducing gas supply pipe 70.

As shown in FIG. 2, dust is supplied from the ore drying unit 80 through the dust supply pipe 90. In the ore drying unit 80, the exhaust gas discharged when the iron ore is dried is collected by dry dust to be collected. Dust collected using the above-described method is supplied to the binderless briquette manufacturing apparatus 10 through the dust supply pipe 90. In addition, the reduced light generated from the molten iron manufacturing apparatus 1000 is collected and supplied to the binderless briquette manufacturing apparatus 10 through the reduced light supply pipe 85. Hereinafter, a process of discharging dust and reduced light from the molten iron manufacturing apparatus 1000 through FIGS. 3 to 5 will be described.

3 schematically shows the ore drying unit 80 of FIG. 2 in which dust is discharged. The discharge process of dust shown in FIG. 3 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, dust may be discharged using other methods.

As shown in FIG. 3, the ore drying unit 80 includes an ore dryer 801, a cyclone 804, a bag filter 808, a combustor 809, and the like. The ore dryer 801 is supplied with coke oven gas (COG) and air to dry iron ore. The dried iron ore is transferred from the ore dryer 801 to the storage bin 802 and stored. Iron ore stored in the storage bin 802 is supplied to the fluidized-bed reduction reactor 20 (shown in FIG. 2).

The exhaust gas discharged from the ore dryer 801 is combusted by the combustor 809. Therefore, the spectroscopic elements contained in the exhaust gas are burned and removed. Unburned spectroscopy, however, is still included in the exhaust gas and enters the cyclone 804 with the exhaust gas. Here, for example, unspectral spectra having a particle size of 1.5 µm or more are extracted to the lower portion of the cyclone 804 by gravity. The extracted unspectral spectra are transferred in the direction of the arrow by the first conveyor belt 806 and stored in the storage bin 802.

Meanwhile, the cyclone 804 separates the unspectral spectroscopy and the remaining exhaust gas is transferred to the bag filter 808, and dusts not collected in the cyclone 804 are collected in the bag filter 808. Dusts have an average particle size of, for example, about 20 μm. Dust collected in the bag filter 808 is collected and transferred to the binderless briquette manufacturing apparatus 10 by the second conveyor belt 807. Therefore, the briquette can be manufactured using dust in the binderless briquette manufacturing apparatus 10.

4 schematically shows the fluidized-bed reduction reactor 20 of FIG. 2 through which reduced light is discharged. Since the fluidized-bed reduction reactor 20 of FIG. 4 is the same as the fluidized-bed reduction reactor 20 of FIG. 2, the same reference numerals are used for the same parts, and a detailed description thereof will be omitted.

Reduced light may be provided from the fluidized-bed reduction reactor 20. Iron ore is reduced to the fluidized-bed reduction furnace 20. When maintaining the fluidized-bed reduction furnace 20, the operation of the fluidized-bed reduction furnace 20 is stopped, and the reduced light deposited in the fluidized-bed reduction furnace 20 is discharged to the outside. For example, as shown in FIG. 4, the reduced light may be discharged to the outside through a wind box under the fourth fluidized-bed reduction reactor 20. After the reduced ore is stored in the temporary storage tank 200 and water cooled, the reduced ore is supplied to the binderless briquette manufacturing apparatus 10 through the reduced ore supply pipe 85.

FIG. 5 schematically shows the compacted material manufacturing apparatus 30 of FIG. 2 in which reduced light is emitted. Since the compacted body manufacturing apparatus 30 of FIG. 5 is the same as that of the compacted body manufacturing apparatus 30 of FIG. 2, the same code | symbol is used for the same part, and the detailed description is abbreviate | omitted.

As shown in FIG. 5, the compacted material manufacturing apparatus 30 provides reduced light. The compacted material manufacturing apparatus 30 receives a reduced-ring iron to manufacture a compacted material in a strip form. The strip compacted material is crushed by the crusher 304 and stored in the compacted material reservoir 306. When the compacted material is crushed by the crusher 304, the compacted material is crushed to generate dust, that is, reduced light. Therefore, the reduced light is supplied from the crusher 304 to the binderless briquette manufacturing apparatus 10 through the reduced light supply pipe 85.

The emission process of the reduced light shown in FIGS. 4 and 5 is merely to illustrate the present invention, but the present invention is not limited thereto. The reduced ore may therefore be emitted using other methods.

6 schematically shows another apparatus for manufacturing molten iron 2000 in which reduced light is discharged. Since the apparatus for manufacturing molten iron 2000 of FIG. 6 is similar to the apparatus for manufacturing molten iron 1000 of FIG. 2, the same reference numerals are used for the same parts, and a detailed description thereof will be omitted. The process of discharging the reduced light shown in FIG. 6 is merely to exemplify the present invention, but the present invention is not limited thereto. The reduced ore may therefore be emitted using other methods.

As shown in FIG. 6, the apparatus for manufacturing molten iron 2000 includes one packed-bed reduction reactor 52. Although not shown in FIG. 6, the apparatus for manufacturing molten iron may include a packed bed reduction furnace and a fluidized bed reduction furnace. Further, the apparatus for manufacturing molten iron may include a plurality of packed bed reduction furnaces.

As shown in FIG. 6, iron ore is charged into the packed-bed reduction reactor 52. The reducing gas generated from the melt gasifier 50 is supplied to the packed-bed reduction furnace 52 through a reducing gas supply pipe 71. The reducing gas supplied to the packed-bed reduction furnace 52 converts iron ore into reduced iron. The reduced iron is charged into the molten gasifier 60, melted and made of molten iron and then discharged to the outside.

In the case of maintaining the packed-bed reduction furnace 52, the packed-bed reduction furnace 52 should be emptied. Therefore, the reduced light in the inside of the packed-bed reduction furnace 52 is discharged to the outside. The reduced light is supplied to the binderless briquette manufacturing apparatus 10 through the reduced light supply pipe 85. Therefore, the briquette can be manufactured in the briquette manufacturing apparatus 10 using the reduced light.

Hereinafter, the present invention will be described in more detail through experimental examples. These experimental examples are only for illustrating the present invention, and the present invention is not limited thereto.

Experimental Example

The components of dust and reduced ore used in the binderless briquette manufacturing apparatus of FIG. 1 were analyzed. The results of analyzing the components of the dust and the reduced light are shown in Table 1 below.

As shown in Table 1, the reduced ore was significantly reduced in iron content. On the other hand, the dust was collected during the drying of the iron ore, and thus had almost the same components as the iron ore.

Various experiments were conducted to prepare binderless briquettes having excellent characteristics using dust and reduced light. Here, the binderless briquette may have a high hot strength so as not to be differentiated at high temperature by the reducing gas inside the molten gasifier when charged into the molten gasifier.

Experimental Example  One

A mixture including dust and reduced light was compression molded using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the particle size of the reduced light was 5 mm or less. Binderless briquettes were manufactured while varying the forming pressure by controlling the torque of the pair of forming rolls. And the compressive strength of the binderless briquettes was measured. Binderless briquettes were prepared with varying molding pressures of 4t / cm, 6t / cm, 8t / cm and 10t / cm, respectively, and the compressive strengths of the binderless briquettes were measured at each molding pressure.

Experimental Example  Experiment result of 1

7 shows a change in the compressive strength of the binderless briquette according to Experimental Example 1 of the present invention. In Fig. 7, the compressive strengths of the binderless briquettes for each forming pressure are shown as black or white circles. In addition, in FIG. 7, the compressive strengths of the binderless briquettes are linearized by a least square method and represented by a dotted line.

As shown in FIG. 7, it can be seen that the compressive strength of the binderless briquette increases linearly as the forming pressure increases by 2t / cm from 4t / cm to 10t / cm. The minimum compressive strength of the binderless briquettes for conveying the binderless briquettes was about 50 kgf / p. In addition, when the binderless briquettes were charged into the melting gasifier, the differentiation rate was greatly reduced when the binderless briquettes had a compressive strength of 80 kgf / p or more. Therefore, when the compressive strength of the binderless briquette is 80kgf / p or more, it is possible to charge the binderless briquette into the melting gasifier. That is, the compressive strength of the binderless briquette may be 80kgf / p to 100kgf / p. If the compressive strength of the binderless briquette is too large, the molding pressure must be large, so that a large load is applied to the pair of forming rolls.

As shown by the dotted lines in FIG. 7, the binderless briquette compressive strength of 80 kgf / p corresponds to a molding pressure of 6 t / cm. Therefore, the molding pressure may be 6t / cm to 10t / cm. If the molding pressure is too small, the binderless briquettes have a small compressive strength, so that the binderless briquettes cannot be used in the melt gasifier. On the contrary, when the forming pressure is too large, the load is applied to the pair of forming rolls too largely and a failure may occur in the pair of forming rolls.

Experimental Example  2

A mixture including dust and reduced light was compression molded using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the molding pressure of the pair of forming rolls was 6t / cm. Binderless briquettes were prepared using reduced ore with various particle sizes, and then the compressive strength of the binderless briquettes was measured. Binderless briquettes were prepared using reduced ore with particle sizes of 1 mm or less, 5 mm or less, and 10 mm or less, respectively.

Experimental Example  3

A mixture including dust and reduced light was compression molded using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the molding pressure of the pair of forming rolls was 10 t / cm. Binderless briquettes were prepared using reduced ore with various particle sizes, and then the compressive strength of the binderless briquettes was measured. Binderless briquettes were prepared using reduced ores having particle sizes of 1 mm or less, 5 mm or less, and 10 mm or less, respectively.

Experimental Example  2 and Experimental Example  3, experimental results

8 is a graph showing changes in compressive strength of binderless briquettes according to Experimental Example 2 and Experimental Example 3 of the present invention. In FIG. 8, a square represents Experimental Example 2 and a circle represents Experimental Example 3. In FIG. In addition, the compressive strength of the binderless briquettes in FIG. 8 is linearized by the least square method and represented by a dotted line. The lower dotted line represents Experimental Example 2, and the upper dotted line represents Experimental Example 3. FIG.

As shown in FIG. 8, the compressive strength of the binderless briquette decreased as the particle size of the reduced ore increased. In addition, when comparing Experimental Example 2 and Experimental Example 3, the compressive strength of the binderless briquette in Experimental Example 2 is much reduced with increasing the particle size of the reduced light than the compressive strength of the binderless briquette in Experimental Example 3. Therefore, when the molding pressure was small, the compressive strength of the binderless briquettes was not significantly affected by the particle size of the reduced ore.

The particle size of the reduced light may be 1mm to 5mm. When the particle size of the reduced ore is too small, for example, when the particle size is less than 1 mm, the compressive strength of the binderless briquette is high, but the particle size selection efficiency of the reduced ore decreases and energy is consumed. On the contrary, when the particle size of the reduced ore is too large, the filling ratio of the mixture to the concave grooves of the forming roll is lowered when producing the binderless briquette. Therefore, the manufacturing process of the binderless briquette becomes unstable.

Experimental Example  4

A mixture including dust and reduced light was compression molded using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the compressive strength of the binderless briquettes prepared while varying the moisture content of the reduced ore was about 0 wt%, 3 wt%, 6 wt%, 9 wt%, 12 wt%, and 17.5 wt%, respectively.

Experimental Example  5

A mixture including dust and reduced light was compression molded using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the compressive strength of the binderless briquettes prepared while varying the moisture content of the reduced ore was about 0 wt%, 3 wt%, 6 wt%, 9 wt%, 12 wt%, and 17.5 wt%, respectively. In Experimental Example 5, a reduced ore was used that was different from that of Experimental Example 4.

Experimental Example  4 and Experimental Example  5 experimental results

9 is a graph showing a change in compressive strength of the binderless briquettes according to Experimental Example 4 and Experimental Example 5 of the present invention. In FIG. 9, a circle represents Experimental Example 4 and a square represents Experimental Example 5. FIG. In Fig. 9, the compressive strength of the binderless briquettes is linearized by the least square method and is indicated by a dotted line.

As shown in FIG. 9, the compressive strength of the binderless briquettes linearly decreased as the amount of reduced light increased. As the water content of the reduced light increases, the mixture adheres to the surface of the pair of forming rolls, so that the moldability is greatly reduced. Therefore, the moisture content of the reduced ore is controlled to 6wt% or less. When the amount of water in the reduced ore exceeds 6 wt%, the compressive strength of the binderless briquettes is greatly reduced.

Experimental Example  6

A mixture including dust and reduced light was compression molded using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the moisture content of the reduced ore was 0 wt%. The compressive strength of the binderless briquettes prepared while increasing the amount of dust mixed with the reduced ore to 0 wt%, 20 wt%, 40 wt%, 60 wt%, 80 wt%, and 100 wt%, respectively was measured.

Experimental Example  7

A binderless briquette was manufactured by compression molding a mixture including dust and reduced light using the same pair of forming rolls as the pair of forming rolls 1104 of FIG. 1. Here, the moisture content of the reduced ore was 3 wt%. The compressive strength of the binderless briquettes was measured while increasing the amount of dust mixed with the reduced ore to 0 wt%, 20 wt%, 40 wt%, 60 wt%, 80 wt%, and 100 wt%, respectively.

Experimental Example  6 and Experimental Example  7 experimental results

10 is a graph showing changes in compressive strength of binderless briquettes according to Experimental Example 6 and Experimental Example 7 of the present invention. In FIG. 10, Experimental Example 6 is represented by a circle, and Experimental Example 7 is represented by a rectangle. In addition, in FIG. 10, the compressive strength of the binderless briquettes is linearized by the least square method to show Experimental Example 6 and Experimental Example 7 as dotted lines.

As shown in FIG. 10, the compressive strength of the binderless briquette decreased as the amount of dust increased. When the amount of dust was 50 wt% or less, the compressive strength of the binderless briquettes could be adequately ensured. When the amount of dust exceeds 50 wt%, the compressive strength of the binderless briquettes is greatly reduced. Therefore, it is not suitable to use a binderless briquette in a melt gasifier.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

1 is a schematic diagram of an apparatus for manufacturing a binderless briquette according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an apparatus for manufacturing molten iron through which raw materials of the binderless briquette of FIG. 1 are discharged.

3 is a schematic view of an ore drying unit from which dust is discharged.

4 is a schematic view of a fluidized-bed reduction reactor from which reduced ore is discharged.

FIG. 5 is a schematic diagram of a compacted material manufacturing apparatus in which reduced light is discharged. FIG.

6 is a schematic view of another apparatus for manufacturing molten iron from which reduced light is emitted.

7 is a graph showing the change in compressive strength of the binderless briquette according to Experimental Example 1 of the present invention.

8 is a graph showing changes in compressive strength of binderless briquettes according to Experimental Example 2 and Experimental Example 3 of the present invention.

9 is a graph showing a change in compressive strength of the binderless briquettes according to Experimental Example 4 and Experimental Example 5 of the present invention.

10 is a graph showing changes in compressive strength of binderless briquettes according to Experimental Example 6 and Experimental Example 7 of the present invention.

Claims (30)

Providing a dust collected by collecting dry exhaust gas discharged during iron ore drying, Providing a reduced ore discharged from a molten iron manufacturing apparatus including a reducing furnace for reducing iron dried by reducing iron ore and a melting gasifier for melting molten iron to produce molten iron; Providing a mixture of the dust and the reduced ore dried and mixed, and Molding the mixture without using a binder to produce a binderless briquette Method for producing a binderless briquette comprising a. The method of claim 1, In the providing of the reduced ore, the reduced ore is dried and the particle size of the binderless briquette manufacturing method provided. The method of claim 2, The reduced ore is a method for producing a binderless briquette containing 10wt% to 30wt% moisture before drying and particle size sorting. The method of claim 2, The reduction rate of the reduced ore is 30% to 60% of the manufacturing method of the binderless briquette. The method of claim 4, wherein The reduced ore is divided into granular reduced or fine granulated reduced ore, and the granulated reduced ore is charged into the molten gasifier to a binderless briquette manufacturing method. The method of claim 5, The particle size of the granulated reduced ore is 8mm or more manufacturing method of a binderless briquette. The method of claim 1, In the step of producing the binderless briquette, the molding pressure when forming the mixture is 6t / cm to 10t / cm method for producing a binderless briquette. The method of claim 1, In the step of providing the mixture, the water content of the reduced ore is greater than 0 and 6wt% or less manufacturing method of the binderless briquette. The method of claim 1, In the providing of the mixture, the particle size of the reduced ore is 1mm to 5mm manufacturing method of the binderless briquette. The method of claim 1, In the step of providing the mixture, the amount of the dust in the mixture is greater than zero and less than 50wt% of the manufacturing method of the binderless briquettes. The method of claim 1, In the providing of the reduced ore, the reduced ore is a binderless briquette manufacturing method provided from the reducing furnace. The method of claim 1, In the providing of the reduced ore, the molten iron manufacturing apparatus, the interconnection of the reducing furnace and the molten gasifier to supply the compacted material produced by compressing the reduced iron discharged from the reduction furnace to the molten gasifier And a compacted material manufacturing apparatus, wherein said reduced light is provided from said compacted material manufacturing apparatus. The method of claim 1, In the step of manufacturing the binderless briquette, the strength of the binderless briquette is 80kgf / p to 100kgf / p method of manufacturing a binderless briquette. The method of claim 1, In the providing of the reducing ore, the reduction furnace is a fluidized bed-type reduction furnace or a packed-bed reduction furnace manufacturing method of a binderless briquette. Dust hopper for storing dust collected by dry dust collecting exhaust gas discharged during iron ore drying, A reduced light hopper for storing the reduced ore discharged from the molten iron manufacturing apparatus including a reducing furnace for providing reduced iron from which the dried iron ore is reduced and a molten gasifier for melting molten reduced iron; A mixer connected to the dust hopper and the reduced light hopper and providing a mixture of the dust and the reduced light dried and mixed, and A pair of forming rolls forming the mixture to provide a binderless briquette Binderless briquette manufacturing apparatus comprising a. The method of claim 15, The mixer, Casing, and Screw-like member extending in one direction in the casing to rotate Binderless briquette manufacturing apparatus comprising a. The method of claim 15, A dryer for drying the reduced ore, and A particle size sorter which interconnects the dryer and the reduced light hopper and selects the dried reduced light into fine-grained reduced light and granulated reduced light Binderless briquette manufacturing apparatus further comprising a. The method of claim 17, The dryer is a rotary kiln of the binderless briquette manufacturing apparatus. The method of claim 17, An apparatus for producing a binderless briquette having a granular reduction ore particle size of 8 mm or more. The method of claim 17, The granulated reduction ore is a binderless briquette manufacturing apparatus is charged into the melt gasifier. The method of claim 17, The dryer is a binderless briquette manufacturing apparatus for drying a reduced ore containing 10wt% to 30wt% water. The method of claim 17, The reduction rate of the reduced ore is 30% to 60% of the binderless briquette manufacturing apparatus. The method of claim 15, The pair of forming rolls is a binderless briquette manufacturing apparatus for molding the mixture at a molding pressure of 6t / cm to 10t / cm. The method of claim 15, The moisture content of the reduced ore is greater than 0 and 6wt% or less of the manufacturing apparatus of the binderless briquette. The method of claim 15, The particle size of the reduced ore is 1mm to 5mm manufacturing apparatus of the binderless briquette. The method of claim 15, Apparatus for producing a binderless briquette, wherein the amount of dust in the mixture is greater than 0 and less than 50 wt%. The method of claim 15, An apparatus for producing a binderless briquette, wherein the reduction furnace supplies the reduced light to the reduced light hopper. The method of claim 15, The molten iron manufacturing apparatus further includes a compacted material manufacturing apparatus for interconnecting the reducing furnace and the molten gasifier and supplying the compacted material produced by compressing the reduced iron discharged from the reducing furnace to the molten gasifier, The reduced ore is the binderless briquette manufacturing apparatus supplied to the reduced light hopper from the compacted material manufacturing apparatus. The method of claim 15, Strength of the binderless briquette is 80kgf / p to 100kgf / p of the binderless briquette manufacturing apparatus. The method of claim 15, The reduction furnace is a fluidized bed reduction furnace or a packed bed reduction furnace manufacturing apparatus of a binderless briquette.

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