CN110586262B - Controllable method for installing alumina grinding medium for ball mill - Google Patents
Controllable method for installing alumina grinding medium for ball mill Download PDFInfo
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- CN110586262B CN110586262B CN201910886366.6A CN201910886366A CN110586262B CN 110586262 B CN110586262 B CN 110586262B CN 201910886366 A CN201910886366 A CN 201910886366A CN 110586262 B CN110586262 B CN 110586262B
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- 238000000227 grinding Methods 0.000 title claims abstract description 206
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 79
- 230000006872 improvement Effects 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 17
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 12
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 12
- 239000010431 corundum Substances 0.000 claims abstract description 12
- 238000002474 experimental method Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- 238000011068 loading method Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 238000004080 punching Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000005457 optimization Methods 0.000 claims description 6
- 230000002349 favourable effect Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 3
- 239000011362 coarse particle Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
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- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 238000005242 forging Methods 0.000 description 6
- 238000009533 lab test Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000009837 dry grinding Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000462 isostatic pressing Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
- B02C17/205—Adding disintegrating members to the tumbling mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a controllable method for an alumina grinding medium loader for a ball mill, which comprises the following steps of (1) selecting an alumina grinding medium: the grinding medium is required to be a corundum ceramic material; (2) selection and technical improvement of the ball mill: selecting a ball mill of a pre-grinding system; the technical improvement of the alumina grinding medium before installation comprises the following steps of (a) optimizing and technical improvement of a pre-grinding system: (b) adjusting the internal structure of the mill: (3) grading of alumina grinding media, finding out the most effective grinding body diameter corresponding to materials with various particle sizes on a test mill in a laboratory, then calculating the grinding body diameter applied in actual production, and then solving a correction coefficient through experiments to finally improve the existing grading; (4) adjusting a central control operation method: the air speed in the mill is 0.8-1.2m/s, and the uniform material flow speed in the mill is kept; the output per machine hour of the plus-minus mill is stable. The method saves energy, reduces consumption, prolongs the service life of the grinding medium and greatly reduces the maintenance workload.
Description
Technical Field
The invention relates to a ball mill, in particular to a controllable method for an alumina grinding medium loader for the ball mill.
Background
The prior ball mill is still the main dry grinding method for cement, mineral powder, fly ash, stone powder and the like, and when the ball mill is used for grinding, a metal grinding body is used as a main grinding medium.
It has the problems that: the large mass of the metal grinding body causes the large dragging power of the ball mill, the high running current and the high grinding energy consumption, so that the power consumption of the dry grinding and the abrasion of the metal grinding body occupy the important part of the cost of the dry grinding, and the inherent problem of the grinding operation is solved.
To solve the above problems, it is now possible to replace the metal grinding bodies with new alumina grinding media of good quality and wear resistance.
In order to ensure the milling efficiency of a ball mill system, the following problems need to be solved, (1) selection of an alumina grinding medium; (2) selecting, optimizing and technically improving the ball mill; (3) grading of alumina grinding media; (4) and adjusting a central control operation method.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a controllable method for an alumina grinding medium loader for a ball mill, which provides medium selection, selection and technical improvement of the ball mill, gradation of the alumina grinding medium and adjustment of a central control operation method for the alumina grinding medium loader, and the alumina grinding medium is used for replacing the traditional metal grinding body, so that the current of a main motor is reduced and the grinding energy consumption is reduced when the ball mill is normally produced; the mass of the alumina grinding medium with the same volume is 50 percent of that of the metal grinding body, so that the whole equipment mass of the ball mill is reduced, the friction of the slide shoe bearing bush is reduced, the temperature is reduced, and the safe operation of mill equipment and the service life are favorably prolonged; in addition, the service life is prolonged, and the maintenance workload is greatly reduced.
In order to solve the technical problems, the invention adopts the following technical means:
a controllable method for an alumina grinding medium loader for a ball mill comprises selection of alumina grinding media, selection and technical improvement of the ball mill, grading of the alumina grinding media and adjustment of a central control operation method, wherein:
(1) the alumina grinding medium is selected from: the grinding medium is required to be a corundum ceramic material, and the corundum ceramic material has the following physical and chemical indexes: carrying out high-speed high; the forming mode of the corundum ceramic material adopts a pressing forming method with high density of blanks such as isostatic pressing forming or spinning forming and the like which is less than or equal to 0.3 percent; the same volume of alumina grinding media mass was 50% of the metal grinding body.
(2) Selection, optimization and technical improvement of the ball mill: selecting a ball mill of a pre-grinding system, and screening the materials to be ground: r0.08Less than or equal to 35 percent, selecting a 3-bin ball mill for an open-circuit system, selecting a 2-bin ball mill for a closed-circuit system, and adding the alumina grinding medium into the bin position with the material fineness: open circuit mill R0.08Less than or equal to 15 percent, closed circuit grinding R0.08Less than or equal to 25 percent, and the comprehensive moisture requirement of the materials to be ground is less than 1.5 percent; in order to balance the flow rate of materials in each bin of the ball mill and enhance the grinding efficiency of grinding media, necessary technical reconstruction is carried out on a ball mill system before an alumina grinding media is installed, and the technical improvement mainly comprises the following aspects of (a) pre-grinding system optimization and technical improvement before the ball mill: the roller surface of the roller press with heavy abrasion is repaired by surfacing welding to increase the drawing and extruding capability of the roller surface to materials, enhance the extruding effect and create micro-crack particle fine powder as much as possible; the worn side baffles on the two sides of the feed opening of the roller press are repaired, so that the edge leakage effect is reduced, the circulation quantity of coarse particle materials which are not extruded is reduced, the pre-grinding effect is improved, the fine powder quantity is increased, and favorable conditions are created for subsequent coarse and fine powder classification; a double-lever feeding device is adopted, so that the feeding amount is flexibly controlled, the feeding is uniform, and the material punching phenomenon of the material is reduced; repairing the scattering plate of the V-shaped powder concentrator, and enhancing the scattering and scattering effects of the materials extruded by the roller press; (b) adjusting the internal structure of the mill: the breakage of the bin separation plate grid plate and the inner sieve plate needs to be repaired or replaced in time, so that large particles in the bin are prevented from entering the next bin, and the influence on the grinding efficiency of the next bin is avoided; plugging and heightening an activated lining plate (an activated ring), controlling the height of the activated lining plate using an alumina grinding medium to be 0.35-0.45D (the effective diameter of a D-ball mill), so as to reduce excessive detention bands generated among the grinding media in the operation process of the ball mill, influence the grinding efficiency, stabilize the flow rate of materials in the mill and ensure that the grinding time of the materials in the mill is 5-10 min; the feeding device changes the traditional chute feeding mode into a spiral feeding mode to prevent the impactThe material phenomenon is avoided, the grinding blind area of one bin is reduced, a novel grate combined type anti-blocking grate plate is used, the through hole rate reaches more than 15 percent, the thickness is 20-50 percent of the original grate plate, the grate seam is of an arbitrary punching structure, and the surface is smooth;
(3) grading of alumina grinding media: the actual production requires that the grinding bodies of several sizes are used in a matched mode, so that certain impact capacity can be guaranteed, and a certain grinding and polishing effect can be achieved. The most effective grinding body diameter corresponding to materials with various particle sizes is found out through a laboratory mill in a laboratory, then the proper grinding body diameter applied in the actual production is calculated, and a correction coefficient is solved through experiments, so that the optimal gradation suitable for the use of an alumina grinding medium is optimized and improved finally, and the method is also an important ring for improving the grinding efficiency of the ball mill;
maximum sphere diameter of the grinding body in the mill: dmax =28 (dmax) 1/3
Average sphere diameter of the grinding body in the mill: d =28 × (D) 1/3
In the formula: dmax-maximum particle size of mill feed, mm;
d-average particle size of the materials entering the mill, mm;
the grading of the abrasive body is calculated as follows: a = B0.785 × D2L ﹠ Φ
In the formula:
a-weight of a ball forging of a certain diameter, ton;
b, the weight proportion of ball forgings with certain diameter to all ball forgings in the bin is percent; d-effective diameter of the bin mill, meter;
l-effective length of the bin mill, meter; ﹠ -volume weight of grinding body, ton/m3(ii) a The metal grinding body is 4.60-4.70, the alumina grinding medium is 2.25-2.30,
phi-fill,%;
(4) adjusting a central control operation method: after the alumina grinding medium is used, the material flow rate is accelerated, the central control room needs to be stably operated, the air quantity for the tail grinding dust remover is reduced, the air speed in the mill is 0.8-1.2m/s, and the uniform material flow rate in the mill is kept; the output per machine hour of the plus-minus mill is stable.
The further preferred technical scheme is as follows:
in the step (1), the corundum ceramic material is a ball-column combination body, the middle of the ball-column combination body is a cylinder, and two ends of the cylinder are spherical surfaces protruding outwards.
The shape is preferably a ball-column combination body, and the advantages of column-shaped line contact and point contact are exerted.
And (3) repairing the side baffle in the step (2) by using alloy steel or bearing steel with good wear resistance.
The arrangement can prolong the service life, reduce the edge leakage effect, improve the pre-grinding effect, increase the fine powder amount and create favorable conditions for subsequent classification
The step (3) comprises the following steps: (a) determining the material-ball ratio of a metal grinding body coarse grinding bin and an alumina grinding medium fine grinding bin in one bin, and determining the loading capacity of a laboratory test grinding body according to the material-ball ratio; (b) determining the residence time of each large mill bin according to the ball ratio and the loading capacity, and determining the experimental time of the large mill in a laboratory test; (c) and finding out a test grinding grade corresponding to the large grinding grade.
Through the steps, the grading of the industrial ball mill can be determined.
In the selection and the technical improvement of the ball mill, the grinding time and the filling rate (the loading capacity of the ball mill) are determined according to the factors of the material flow rate in a grinding mill of a configured roller press or a vertical mill and a ball mill pre-grinding system, the diameter of an experimental mill, the productivity and the like, the fineness and the ratio table of the material subjected to secondary grinding are close to the industriality as targets, if the difference is too large, the grinding time needs to be adjusted again, and the proportion of the two-time grinding time of the same sample is approximately equal to the proportion distribution of the lengths of a first bin and a second bin of an alumina grinding medium mill; the ratio of steel balls to materials in the first bin is 8:1, and the ratio of metal grinding bodies in the second bin to alumina grinding media is 10:1-6:1 respectively.
Drawings
Fig. 1 is a schematic structural view of a plate-inserting type feeding mode in the prior art.
Fig. 2 is a schematic structural view of a lever type feeding method adopted by the present invention.
Figure 3 is a schematic diagram of the feed chute configuration of the prior art solution.
FIG. 4 is a schematic structural view of a screw feeding method employed in the present invention.
FIG. 5 is a schematic structural view of a discharge plate of the prior art.
Fig. 6 is a schematic structural view of the novel grate combined type anti-blocking grate plate of the invention.
FIG. 7 is a schematic view showing the structure of the ball and post combination of the present invention.
Description of reference numerals: 1-spherical surface; 2-cylinder.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1-7, the controllable method of alumina grinding media loading for ball mills of the present invention includes selection of alumina grinding media, selection and modification of ball mills, grading of alumina grinding media, and adjustment of the control operation method, wherein:
(1) the alumina grinding medium is selected from: the grinding medium is required to be a corundum ceramic material, and the corundum ceramic material has the following physical and chemical indexes: carrying out high-speed high; the forming mode of the corundum ceramic material adopts a pressing forming method with high density of blanks such as isostatic pressing forming or spinning forming and the like which is less than or equal to 0.3 percent; the mass of alumina grinding media at the same volume is 50% of the metal grinding body;
(2) selection, optimization and technical improvement of the ball mill: selecting a ball mill of a pre-grinding system, and screening the materials to be ground: r0.08Less than or equal to 35 percent, selecting a 3-bin ball mill for an open-circuit system, selecting a 2-bin ball mill for a closed-circuit system, and adding the alumina grinding medium into the bin position with the material fineness: open circuit mill R0.08Less than or equal to 15 percent, closed circuit grinding R0.08Less than or equal to 25 percent, and the comprehensive moisture requirement of the materials to be ground is less than 1.5 percent; in order to balance the flow rate of materials in each bin of the ball mill and enhance the grinding efficiency of grinding media, necessary technical reconstruction is carried out on a ball mill system before an alumina grinding media is installed, and the technical improvement mainly comprises the following aspects of (a) pre-grinding system optimization and technical improvement before the ball mill: build-up welding repair of the roller surface of the roller press with heavy wear to increaseThe large roller surface has the capability of controlling and extruding materials, the extruding effect is enhanced, and micro-crack particle fine powder is created as much as possible; the worn side baffles on the two sides of the feed opening of the roller press are repaired, so that the edge leakage effect is reduced, the circulation quantity of coarse particle materials which are not extruded is reduced, the pre-grinding effect is improved, the fine powder quantity is increased, and favorable conditions are created for subsequent coarse and fine powder classification; a double-lever feeding device is adopted, so that the feeding amount is flexibly controlled, the feeding is uniform, and the material punching phenomenon of the material is reduced; repairing the scattering plate of the V-shaped powder concentrator, and enhancing the scattering and scattering effects of the materials extruded by the roller press; (b) adjusting the internal structure of the mill: the breakage of the bin separation plate grid plate and the inner sieve plate needs to be repaired or replaced in time, so that large particles in the bin are prevented from entering the next bin, and the influence on the grinding efficiency of the next bin is avoided; plugging and heightening an activated lining plate (an activated ring), controlling the height of the activated lining plate using an alumina grinding medium to be 0.35-0.45D (the effective diameter of a D-ball mill), so as to reduce excessive detention bands generated among the grinding media in the operation process of the ball mill, influence the grinding efficiency, stabilize the flow rate of materials in the mill and ensure that the grinding time of the materials in the mill is 5-10 min; the feeding device changes the traditional chute feeding mode into a spiral feeding mode, prevents the material punching phenomenon, reduces the grinding blind area of a bin, uses a novel grate combined type anti-blocking grate plate, has the through hole rate of more than 15 percent, has the thickness of 20-50 percent of the original grate plate, has a grate seam of an arbitrary punching structure and has a smooth and flat surface;
(3) grading of alumina grinding media: the actual production requires that the grinding bodies of several sizes are used in a matched mode, so that certain impact capacity can be guaranteed, and a certain grinding and polishing effect can be achieved. The most effective grinding body diameter corresponding to materials with various particle sizes is found out through a laboratory mill in a laboratory, then the proper grinding body diameter applied in the actual production is calculated, and a correction coefficient is solved through experiments, so that the optimal gradation suitable for the use of an alumina grinding medium is optimized and improved finally, and the method is also an important ring for improving the grinding efficiency of the ball mill;
maximum sphere diameter of the grinding body in the mill: dmax =28 (dmax) 1/3
Average sphere diameter of the grinding body in the mill: d =28 × (D) 1/3
In the formula: dmax-maximum particle size of mill feed, mm;
d-average particle size of the materials entering the mill, mm;
the grading of the abrasive body is calculated as follows: a = B0.785 × D2L ﹠ Φ
In the formula:
a-weight of a ball forging of a certain diameter, ton;
b, the weight proportion of ball forgings with certain diameter to all ball forgings in the bin is percent; d-effective diameter of the bin mill, meter;
l-effective length of the bin mill, meter; ﹠ -volume weight of grinding body, ton/m3(ii) a The metal grinding body is 4.60-4.70, the alumina grinding medium is 2.25-2.30,
phi-fill,%;
(4) adjusting a central control operation method: after the alumina grinding medium is used, the electrostatic phenomenon generated by friction between grinding bodies and between materials in the ball mill is weakened, the electrostatic adsorption phenomenon between material particles is reduced, the material flow rate is accelerated, the grinding time is reduced easily, and the grinding is insufficient. The central control room realizes stable operation of system parameters of the ball mill, uniform feeding, reduction of air volume for a tail grinding dust remover, control of the air speed in the mill to be 0.8-1.2m/s and maintenance of uniform material flow speed in the mill;
in the step (1), the corundum ceramic material is a ball-column combination body, the middle of the ball-column combination body is a cylinder, and two ends of the cylinder are spherical surfaces protruding outwards.
The shape is preferably a ball-column combination body, and the advantages of column-shaped line contact and point contact are exerted.
And (3) repairing the side baffle in the step (2) by using alloy steel or bearing steel with good wear resistance.
The arrangement can prolong the service life, reduce the edge leakage effect, improve the pre-grinding effect, increase the fine powder amount and create favorable conditions for subsequent classification.
The step (3) comprises the following steps: (a) determining the material-ball ratio of a metal grinding body coarse grinding bin and an alumina grinding medium fine grinding bin in one bin, and determining the loading capacity of a laboratory test grinding body according to the material-ball ratio; (b) determining the residence time of each large mill bin according to the ball ratio and the loading capacity, and determining the experimental time of the large mill in a laboratory test; (c) and finding out a test grinding grade corresponding to the large grinding grade.
Through the steps, the grading of the large mill can be determined.
In the selection and the modification of the ball mill, the grinding time and the filling rate (ball mill loading) need to be determined. The grinding time is determined according to the material flow rate in a grinding mill of a configured roller press or a vertical mill and a ball mill pre-grinding system, the diameter of an experimental mill, the productivity and other factors, the fineness and the ratio of the material ground for the second time are close to the industriality, if the difference is too large, the grinding time needs to be readjusted, and the proportion of the grinding time for the two times of grinding of the same sample is approximately equal to the proportion distribution of the lengths of a first bin and a second bin of an alumina grinding medium mill; the steel ball material ratio of the first bin is 8:1, and the metal grinding body and the alumina grinding medium of the second bin are respectively 10:1-6: 1;
grading experiment
Experiment article
Materials: 40kg of grinding materials of a pre-grinding system of the roller press;
grinding: SM500 laboratory test mill (48 r/min) and appropriate weighing apparatus;
ball material ratio: ball material ratio: steel balls (about 8: 1), alumina grinding media (about 4: 1)
Grinding body: see Table 1
Note: the large-specification grinding body cannot be weighed right at the moment, the weight of the small-specification grinding body is adjusted at the moment, the average sphere diameter is calculated according to the actual weight, the actual grading scheme is recorded, and the loading capacity is ensured to accord with the design scheme. In addition, the grading scheme is designed under the condition that the particle size distribution of the experimental material is unknown, and the grading scheme is not proper, and can be properly adjusted according to the actual condition during the experiment.
Note that: the experimental material can be taken from a grinding head in a first bin, taken from a bin head in a mill in a second bin, and prepared by a laboratory test mill.
The experimental steps are as follows:
(1) uniformly mixing 40kg of materials for experiments, and taking a small amount of samples to obtain 80-micrometer and 45-micrometer screen residue and specific surface area;
(2) weighing 8 parts of 5kg of the material in the experimental step 1, and washing and grinding the first part of the material out;
(3) grinding the materials in the step 2 according to a design grading scheme (shown in a table 2) for 8 minutes, throwing and cleaning the materials in the mill (the time of each throwing and grinding is kept consistent), collecting the ground materials (the production loss is reduced as much as possible, and enough samples are reserved for subsequent experiments) and uniformly mixing; a small amount of sample was sampled to measure 80 μm, 45 μm, and specific surface area, respectively.
(4) Weighing 5kg of the materials prepared in the experiment step 3, grinding for 8 minutes according to the grading 2-7 respectively, throwing and grinding the materials uniformly, and sampling to obtain the materials with the specific surface area of 80 microns, 45 microns.
Table 2: grading scheme design
According to experimental data of the schemes 1 to 7, the grading powder grinding effect of the scheme 1 is better under the same material and grinding conditions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (2)
1. A controllable method for an alumina grinding medium loader for a ball mill comprises selection of alumina grinding media, selection and technical improvement of the ball mill, grading of the alumina grinding media and adjustment of a central control operation method, and is characterized in that:
(1) the alumina grinding medium is selected from: the grinding medium is required to be a corundum ceramic material, and the corundum ceramic material has the following physical and chemical indexes: carrying out high-speed high; the mass of alumina grinding media at the same volume is 50% of the metal grinding body; the corundum ceramic material is a ball-column combination body, the middle of the ball-column combination body is a cylinder, and two ends of the cylinder are spherical surfaces protruding outwards;
(2) selection, optimization and technical improvement of the ball mill: selecting a ball mill of a pre-grinding system, and screening the materials to be ground: r0.08Less than or equal to 35 percent, selecting a 3-bin ball mill for an open-circuit system, selecting a 2-bin ball mill for a closed-circuit system, and adding the alumina grinding medium into the bin position with the material fineness: open circuit mill R0.08Less than or equal to 15 percent, closed circuit grinding R0.08Less than or equal to 25 percent, and the comprehensive moisture requirement of the materials to be ground is less than 1.5 percent; in order to balance the material flow rate in each bin of the ball mill and enhance the grinding efficiency of the grinding medium, the necessary technical transformation is carried out on the ball mill system before the alumina grinding medium is installed, and the technical improvement mainly comprises the following aspects: (a) pre-grinding system optimization and technical improvement before the ball mill: surfacing and repairing the roller surface of the roller press with heavy abrasion so as to increase the drawing and extruding capacity of the roller surface to materials, enhance the extruding effect and produce micro-crack particle fine powder; the worn side baffles on the two sides of the feed opening of the roller press are repaired, so that the edge leakage effect is reduced, the circulation quantity of coarse particle materials which are not extruded is reduced, the pre-grinding effect is improved, the fine powder quantity is increased, and favorable conditions are created for subsequent coarse and fine powder classification; a double-lever feeding device is adopted, so that the feeding amount is flexibly controlled, the feeding is uniform, and the material punching phenomenon of the material is reduced; repairing the scattering plate of the V-shaped powder concentrator, and enhancing the scattering and scattering effects of the materials extruded by the roller press; (b) adjusting the internal structure of the mill: the breakage of the bin separation plate grid plate and the inner sieve plate needs to be repaired or replaced in time, so that large particles in the bin are prevented from entering the next bin, and the influence on the grinding efficiency of the next bin is avoided; plugging and heightening the activation lining plate, controlling the height of the activation lining plate using an alumina grinding medium to be 0.35-0.45D so as to reduce excessive detention belts generated among the grinding media in the running process of the ball mill and influence the grinding efficiency, and simultaneously stabilizing the flow rate of materials in the mill and ensuring the grinding time of the materials in the mill to be 5-10 min; the feeding device changes the traditional chute feeding into a spiral feeding mode, prevents the phenomenon of material flushing, reduces the grinding blind area of a bin, uses a novel grate combined type anti-blocking grate plate,the through hole rate reaches more than 15 percent, the thickness is 20 to 50 percent of the original grate plate, the grate gap is of any punching structure, and the surface is smooth; in the selection and the technical improvement of the ball mill, the grinding time is determined according to the material flow rate in a grinding mill provided with a roller press or a vertical mill and a ball mill pre-grinding system, the diameter of the experimental mill, the productivity and other factors, the fineness and the ratio of the materials ground for the second time are close to the industriality, if the difference is too large, the grinding time needs to be adjusted again, and the proportion of the grinding time for the two times of the same sample is approximately equal to the proportion distribution of the lengths of a first bin and a second bin of an alumina grinding medium mill; the steel ball material ratio of the first bin is 8:1, and the metal grinding body and the alumina grinding medium of the second bin are respectively 10:1-6: 1; the filling rate of the alumina grinding medium is designed to be 120% of the filling rate of the metal grinding body;
(3) grading of alumina grinding media: the actual production requires that grinding bodies with several sizes are matched for use, so that certain impact capacity can be ensured, and a certain grinding and rubbing effect can be achieved, the most effective grinding body diameter corresponding to materials with various particle sizes is found out through a laboratory grinder in a laboratory, then the proper grinding body diameter applied in the actual production is calculated, the correction coefficient is calculated through experiments, the optimal grading suitable for the use of an alumina grinding medium is optimized and improved finally, and the method is also an important ring for improving the grinding efficiency of the ball mill; the grading of alumina grinding media comprises the steps of: (a) determining the material-ball ratio of a coarse grinding bin of a metal grinding body and a fine grinding bin of an alumina grinding medium in one bin, and determining the loading capacity of the experimental grinding body according to the material-ball ratio in the ball mill; (b) determining the detention time of each bin of the large mill according to the ratio of the material balls and the loading capacity, and determining the experimental grinding time of the experimental mill; (c) finding out an experimental mill grade corresponding to the large mill grade;
(4) adjusting a central control operation method: after the alumina grinding medium is used, the electrostatic phenomenon generated by friction between grinding bodies and between materials in the ball mill is weakened, the electrostatic adsorption phenomenon between material particles is reduced, the material flow rate is accelerated, the grinding time is easily reduced, the phenomenon of insufficient grinding is caused, the stable operation of system parameters of the ball mill is realized in a central control room, the feeding is uniform, the air volume for a tail grinding dust remover is reduced, the air speed in the mill is controlled to be 0.8-1.2m/s, and the uniform material flow rate in the mill is maintained.
2. The machine-controlled method of alumina grinding media for ball mills of claim 1, characterized in that: and (3) repairing the side baffle in the step (2) by using alloy steel or bearing steel with good wear resistance.
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