CN110653043A - Ore grinding method considering ores with different hardness - Google Patents

Ore grinding method considering ores with different hardness Download PDF

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Publication number
CN110653043A
CN110653043A CN201910765198.5A CN201910765198A CN110653043A CN 110653043 A CN110653043 A CN 110653043A CN 201910765198 A CN201910765198 A CN 201910765198A CN 110653043 A CN110653043 A CN 110653043A
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ball mill
steel balls
ore grinding
ore
ores
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CN110653043B (en
Inventor
赵天岩
苗梁
胡延明
包玺琳
罗刚
王婷霞
王小强
王军如
马应平
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Northwest Research Institute of Mining and Metallurgy
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Northwest Research Institute of Mining and Metallurgy
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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
    • 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
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
    • B03B5/34—Applications of hydrocyclones

Abstract

The grinding method for the ores with different hardness belongs to the field of mineral processing engineering, grinding operation of the ores with different hardness is carried out in a set of grinding system, and various ores can reach the same grinding fineness by adjusting the grinding medium conditions of a ball mill, the sand return ratio of a hydrocyclone, the grinding concentration of the ball mill and the grinding time of the ball mill, wherein the grinding medium conditions of the ball mill are the diameter ratio of a grinding medium and the filling rate of the grinding medium. The ore discharge fineness of the ball mill can be ensured to be basically the same, and the ore dressing technical indexes of ores with different hardness are ensured.

Description

Ore grinding method considering ores with different hardness
Technical Field
The invention belongs to the field of mineral processing engineering, and particularly relates to an ore grinding method considering different hardness ores and application thereof.
Background
A certain mine in Xinjiang produces various ores with different properties due to the problem of geological structure, and the difference of the produced ores is mainly shown as follows: 1. the ores are different in metal beneficial to value and are roughly divided into three types of ores, namely single copper ores, single molybdenum ores and copper-molybdenum ores; 2. the gangue is different in types and roughly divided into three types, namely pomegranate seeds, green cord stones and andesite stones, and the content difference of the gangue above the ores with different properties is large; 3. the hardness of the ore is different, and the Mohs hardness of the single copper ore is nearly doubled compared with that of the single molybdenum ore. How to give consideration to the ores with the complex properties in the same ore grinding process and make the ores reach the same flotation fineness, reduce the influence on flotation indexes due to the change of the flotation fineness and ensure the recovery rate of valuable metals. More than two kinds of ores with different properties can be processed in one ore grinding system, and the technical difficulties are high. The main reasons are: the ore composition difference of the first single copper ore and the copper-molybdenum ore is large, the single copper ore contains more garnet components, the ore grinding difficulty is large, and the ore grinding fineness of the two ores is difficult to control in a set of sorting system; the second two different ore grinding media have larger difference in filling rate of the grinding media of the ball mill and the proportion requirement of the steel balls, so that the grinding media are more complicated to control; the amount of return sand generated in the process of grinding ores with different ore types is different, so that how to consider different treatment amounts for the cyclone ore feeding pump is also a difficult point of design.
Disclosure of Invention
The invention provides an ore grinding method considering different hardness ores and application thereof, which can enable the two ores to reach the same ore grinding fineness:
the invention is realized by the following modes:
the grinding method for ore with different hardness is characterized by that in a set of grinding system the grinding operation for ore with different hardness can be implemented, and the grinding medium of ball mill and sand-returning ratio of hydraulic cyclone can be regulated to control grinding time of ball mill so as to make various ores obtain identical grinding fineness.
The ore grinding medium is steel balls, and the ball diameter proportion and the filling rate of the steel balls of the ball mill are controlled according to ores with different hardness in ore grinding operation.
In the ore grinding operation, a flat bottom swirler is selected as a first-stage ore grinding grading system, and a 45-degree cone swirler is selected as a second-stage ore grinding grading system.
In the ore grinding system, an ore feeding pipeline connecting a cyclone and a slurry pump is laid simultaneously by adopting at least two different pipe diameters.
In the ore grinding operation, the ore grinding concentration of the ball mill is controlled according to ores with different hardness.
The application of the ore grinding method considering different hardness ores in copper-molybdenum ores is characterized in that: for single copper ore with the Purchase hardness of 16-18, the processing efficiency of the ball mill is 155-fold sand per hour, the sand return ratio of the first-stage cyclone is 250-fold sand, the grinding concentration is 70-72%, the ball diameters of the steel balls of the ball mill are 100mm, 80mm and 50mm, the steel balls are filled according to the proportion of 5:3:2, and the filling rate of the steel balls is 48%; for copper-molybdenum ore with the hardness of 12-14 Ponders, the treatment efficiency of the ball mill is 180-190 tons/h, the sand return ratio of the first-stage cyclone is 85-125, the ore grinding concentration is 75-78%, the ball diameters of the steel balls of the ball mill are 100mm, 80mm and 50mm, the steel balls are filled according to the proportion of 4:4:2, and the filling rate of the steel balls is 45%. The Mohs hardness of the single molybdenum ore is 8-10, the treatment efficiency of the ball mill is 220-one ton/h, the sand return ratio of the first-stage cyclone is 50-80, the ball diameters of the steel balls of the ball mill are 80mm, 60mm and 40mm, and the steel balls are filled according to the ratio of 4:4:2, and the filling rate of the steel balls is 40%.
1. In the ore grinding operation, a flat bottom swirler is selected as a first-stage ore grinding grading system, and a 45-degree cone swirler is selected as a second-stage ore grinding grading system.
2. According to different ore hardness, the grinding time of the ball mill is controlled by adjusting the sand return ratio of the hydraulic cyclone and the grinding medium ratio of the ball mill, so that the two kinds of ores reach the same grinding fineness.
1) The Mohs hardness of the single copper ore is 16-18, the treatment efficiency of the ball mill is 155-160 tons/h, and the sand return ratio of the first-stage cyclone is 200-250. The ball mill is filled with steel balls with the ball diameters of 100mm, 80mm and 50mm according to the proportion of 5:3:2, and the filling rate of the steel balls is 48%.
2) The Mohs hardness of the copper-molybdenum ore is 12-14, the treatment efficiency of the ball mill is 180-190 tons/h, and the sand return ratio of the first-stage cyclone is 85-125. The ball mill is filled with steel balls with the ball diameters of 100mm, 80mm and 50mm according to the proportion of 4:4:2, and the filling rate of the steel balls is 45%.
3) The Mohs hardness of the copper-molybdenum ore is 8-10, the ball mill treatment efficiency is 220-240 tons/h, and the sand return ratio of the first-stage cyclone is 50-80. The ball diameter of the steel ball of the ball mill is 80mm, 60mm and 40mm, and the steel ball is filled according to the proportion of 4:4:2, and the filling rate of the steel ball is 40%.
3. In order to ensure that the middling pump works smoothly under the condition of different flow rates, two pipelines with different pipe diameters are laid simultaneously in the design, the pipe diameter of a large pipeline is 279mm, and the pipe diameter of a small pipeline is 209 mm.
4. The size of the sand return amount of the cyclone and the thickness of the granularity of the cyclone not only relate to the quality of the classification process, but also directly influence the production capacity and the working condition of the mill. Since the cyclone return sand also needs to be returned to the mill for processing, it is often combined with the raw feed of the mill to be referred to as the "total feed" of the mill. Because the return sand of the cyclone accounts for a certain proportion (even most) of the total ore feeding, the return sand granularity plays a relatively stable role in determining the granularity characteristic of the total ore feeding, and when the ore feeding amount and the granularity of the ore feeding fluctuate in a short time, the influence on an ore grinding machine is small. Therefore, the working condition of the ore mill can be relatively stable by keeping a certain sand return amount, so that the ore discharge amount and the ore discharge granularity of the ore mill are relatively stable.
The technical data can ensure that the ore discharge fineness of the ball mill is basically the same, and the ore dressing indexes of different ore properties are ensured.
The invention has the beneficial effects that:
1. the flat-bottom cyclone is selected for the first-section ore grinding grading system in the ore grinding system, the cyclone is easy to control the sand return ratio, the sand return ratio is convenient to adjust for ores with different hardness, and the technology is mainly realized by changing the size of a sand settling nozzle of the cyclone. The two-stage ore grinding classification system adopts a 45-degree cone cyclone which is easy to control the overflow fineness and is convenient to adjust the selecting fineness of ores with different hardness. The method has the advantages that the grinding time required by the ores with different hardness is ensured, the grinding time required by the ores with different hardness is different, the grinding time required by the hardness of the ores with large hardness is long, the sand return amount of the corresponding cyclone is large, the grinding time required by the hardness of the ores with small hardness is short, and the sand return amount of the corresponding cyclone is small. The device and the method effectively solve the problem of uneven ore grinding caused by large ore grinding time difference of ores with different hardness in the same type of ball mill.
2. The filling rate and the steel ball proportion of a medium of the ball mill are controlled aiming at the hardness-obstructed ore, the ball diameter and the filling rate of the steel ball of the ball mill which are adaptive to the hardness of the ore are selected, the ore grinding efficiency can be effectively improved, the deterioration time of the steel ball is prolonged, and the selection fineness of ore pulp is ensured while the production cost is reduced.
3. The technical means can ensure that the ore discharge fineness of the ball mill is basically the same, and ensure the ore dressing technical indexes of ores with different hardness.
Detailed Description
Example 1
Treating the single copper ore ball mill effect: 160 tons/hour (dry weight), the ball diameters of the steel balls of the first-stage ball mill are respectively 100mm, 80mm and 50mm, and the steel balls are filled according to the proportion of 5:3:2, and the filling rate of the steel balls is 48 percent. 58 tons of water are added into the ball mill every hour, and the 72 percent ore grinding concentration of the ball mill is maintained. The sand return ratio of the first cyclone is controlled to be about 250, and a 60mm sand settling nozzle is used. The overflow fineness of the first-stage cyclone is ensured to reach 38-200 meshes, and a pipeline with the diameter of 209mm is used for the ore feeding pipe of the first-stage cyclone. The ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 50%, the sand return ratio of the two-stage cyclone is controlled at 280, and the good index that the flotation fineness reaches 72-200 purposes is obtained.
Example 2
Treating the single copper ore ball mill effect: 155 ton/h (dry weight), the ball diameters of the steel balls of the first-stage ball mill are respectively 100mm, 80mm and 50mm, and the steel balls are filled according to the proportion of 5:3:2, and the filling rate of the steel balls is 48 percent. And the ball mill is replenished with 54 tons of water every hour, and the grinding concentration of the ball mill is kept at 70%. The sand return ratio of the first cyclone is controlled to be about 200, and a 65mm sand settling nozzle is used. The overflow fineness of the first-stage cyclone is ensured to reach 38-200 meshes, and a pipeline with the diameter of 209mm is used for the ore feeding pipe of the first-stage cyclone. The ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 50%, the sand return ratio of the two-stage cyclone is controlled to be about 230, and a good index that the flotation fineness reaches 74-200 purposes is obtained.
Example 3
Treating the table effect of the copper-molybdenum ore ball mill: 180 tons/hour (dry weight), the ball diameters of the steel balls of the first-stage ball mill are respectively 100mm, 80mm and 50mm, and the steel balls are filled according to the proportion of 4:4:2, and the filling rate of the steel balls is 45 percent. 65 tons of water are added into the ball mill every hour, and the 78% ore grinding concentration of the ball mill is maintained. The sand return ratio of the first cyclone is controlled to be about 125, and a 70mm sand settling nozzle is used. The overflow fineness of the first cyclone is ensured to reach 42-200 meshes, and the first cyclone is used for a pipeline with the diameter of 279mm for a mineral supply pipe. The ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, and the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 50%, the sand return ratio of the two-stage cyclone is controlled to be about 350, and the good index that the flotation fineness reaches 75-200 purposes is obtained.
Example 4
Treating the table effect of the copper-molybdenum ore ball mill: 190 tons/hour (dry weight), the ball diameters of the steel balls of the first-stage ball mill are respectively 100mm, 80mm and 50mm, and the steel balls are filled according to the proportion of 4:4:2, and the filling rate of the steel balls is 45%. And supplementing 65 tons of water into the ball mill every hour, and keeping 75% of ore grinding concentration of the ball mill. The sand return ratio of the first cyclone is controlled to be about 85, and a 70mm sand settling nozzle is used. The overflow fineness of the first cyclone is ensured to reach 42-200 meshes, and the first cyclone is used for a pipeline with the diameter of 279mm for a mineral supply pipe. The ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 50%, the sand return ratio of the two-stage cyclone is controlled to be about 350, and a good index that the flotation fineness reaches 73-200 purposes is obtained.
Example 5
Treating the single molybdenum ore ball mill effect: 220 tons/hour (dry weight), the ball diameter of the steel ball of the ball mill is 80mm, 60mm and 40mm, the steel ball is filled according to the proportion of 4:4:2, and the filling rate of the steel ball is 40 percent. And supplementing 65 tons of water into the ball mill every hour, and keeping the 72 percent ore grinding concentration of the ball mill. The sand return ratio of the first cyclone is controlled to be about 80, and an 80mm sand settling nozzle is used. The overflow fineness of the first cyclone is ensured to reach 42-200 meshes, and the first cyclone is used for a pipeline with the diameter of 279mm for a mineral supply pipe. The ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, and the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 48%, the sand return ratio of the two-stage cyclone is controlled to be about 350, and the good index that the flotation fineness reaches 75-200 purposes is obtained.
Example 6
Treating the single molybdenum ore ball mill effect: 240 tons/hour (dry weight), the ball diameter of the steel ball of the ball mill is 80mm, 60mm and 40mm, the steel ball is filled according to the proportion of 4:4:2, and the filling rate of the steel ball is 40 percent. 69 tons of water are added into the ball mill every hour, and the grinding concentration of the ball mill is kept at 70%. The sand return ratio of the first cyclone is controlled to be about 60, and an 85mm sand settling nozzle is used. The overflow fineness of the first cyclone is ensured to reach 38-200 meshes, and the first cyclone is used for a pipeline with the diameter of 279mm for a mineral supply pipe. The ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, and the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 45%, the sand return ratio of the two-stage cyclone is controlled to be about 400, and the good index that the flotation fineness reaches 72-200 purposes is obtained.

Claims (6)

1. An ore grinding method giving consideration to ores with different hardness is characterized in that: in one set of ore grinding system, ore grinding operation of ores with different hardness is carried out, and various ores can reach the same ore grinding fineness by adjusting the ore grinding medium condition of the ball mill, the sand return ratio of the hydrocyclone, the ore grinding concentration of the ball mill and the ore grinding time of the ball mill, wherein the ore grinding medium condition of the ball mill is the diameter ratio of the ore grinding medium and the filling rate of the ore grinding medium.
2. The ore grinding method compatible with ores with different hardness according to claim 1, characterized in that: for single copper ore with the Purchase hardness of 16-18, the processing efficiency of the ball mill is 155-fold sand per hour, the sand return ratio of the first-stage cyclone is 250-fold sand, the grinding concentration is 70-72%, the ball diameters of the steel balls of the ball mill are 100mm, 80mm and 50mm, the steel balls are filled according to the proportion of 5:3:2, and the filling rate of the steel balls is 48%; the ball diameters of steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 50%, and the sand return ratio of the two-stage cyclone is controlled at 230-280.
3. The ore grinding method compatible with ores with different hardness according to claim 1, characterized in that: for copper-molybdenum ore with the hardness of 12-14 Technolten, the treatment efficiency of the ball mill is 180-190 tons/h, the sand return ratio of a first-stage cyclone is 85-125, the ore grinding concentration is 75-78%, the ball diameters of the steel balls of the ball mill are 100mm, 80mm and 50mm, and the steel balls are filled according to the proportion of 4:4:2, and the filling rate of the steel balls is 45%; the ball diameters of the steel balls of the two-stage ball mill are respectively 80mm, 60mm and 40mm, the steel balls are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 50%, and the sand return ratio of the two-stage cyclone is controlled at 350.
4. The ore grinding method compatible with ores with different hardness according to claim 1, characterized in that: the Mohs hardness of the single molybdenum ore is 8-10, the treatment efficiency of the ball mill is 220-year sand-return ratio of 240 tons/hour, the sand-return ratio of the first-stage cyclone is 50-80, 70-72% of the grinding concentration of the ball mill is kept, the ball diameters of the steel balls of the ball mill are 80mm, 60mm and 40mm and are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 40%, the ball diameters of the steel balls of the second-stage ball mill are 80mm, 60mm and 40mm and are filled according to the proportion of 4:4:2, the filling rate of the steel balls is 45-48%, and the sand-return ratio of the second-stage cyclone is controlled at.
5. The ore grinding method compatible with ores with different hardness according to claim 1, characterized in that: in the ore grinding operation, a flat bottom swirler is selected as a first-stage ore grinding grading system, and a 45-degree cone swirler is selected as a second-stage ore grinding grading system.
6. The ore grinding method compatible with ores with different hardness according to claim 1, characterized in that: in the ore grinding system, an ore feeding pipeline connecting a cyclone and a slurry pump is laid simultaneously by adopting at least two different pipe diameters.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111241691A (en) * 2020-01-16 2020-06-05 鞍钢集团矿业有限公司 Method for determining size and proportion of ore grinding medium of first-stage ball mill
CN114870988A (en) * 2022-05-11 2022-08-09 内蒙古大中矿业股份有限公司 Automatic ore dressing monitoring method and system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012034808A1 (en) * 2010-09-14 2012-03-22 Siemens Aktiengesellschaft Determining the fineness of a ground material, in particular an ore, in a mill
CN104028364A (en) * 2014-04-30 2014-09-10 江西理工大学 Multi-metal ore-separating and ore-grinding grading optimization test method
CN106583060A (en) * 2016-11-21 2017-04-26 西北矿冶研究院 Beneficiation method for low-grade copper-molybdenum ore and single copper ore

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012034808A1 (en) * 2010-09-14 2012-03-22 Siemens Aktiengesellschaft Determining the fineness of a ground material, in particular an ore, in a mill
CN104028364A (en) * 2014-04-30 2014-09-10 江西理工大学 Multi-metal ore-separating and ore-grinding grading optimization test method
CN106583060A (en) * 2016-11-21 2017-04-26 西北矿冶研究院 Beneficiation method for low-grade copper-molybdenum ore and single copper ore

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111241691A (en) * 2020-01-16 2020-06-05 鞍钢集团矿业有限公司 Method for determining size and proportion of ore grinding medium of first-stage ball mill
CN111241691B (en) * 2020-01-16 2023-04-07 鞍钢集团矿业有限公司 Method for determining size and proportion of ore grinding medium of first-stage ball mill
CN114870988A (en) * 2022-05-11 2022-08-09 内蒙古大中矿业股份有限公司 Automatic ore dressing monitoring method and system

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