Method for determining size and proportion of ore grinding medium of first-stage ball mill

A grinding medium and ball mill technology, applied in grain processing, design optimization/simulation, etc., can solve the problems affecting the normal progress of production activities, low grinding efficiency, long cycle, etc., to save production time, improve grinding efficiency, short cycle effect

Active Publication Date: 2020-06-05
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The grinding process is a complex and changeable process with many influencing factors, among which the size of the grinding medium and its proportioning system have the most significant impact on the grinding efficiency and the degree of dissociation of mineral monomers. The size of the steel ball is single (the size of the ball milling medium is generally Φ120mm or Φ100mm), the grinding efficiency is low, and the energy consumption is high; however, the appropriate medium size and proportion are determined through the optimization of the grinding industrial test, and the cycle is too long, which affects the production activities. Work properly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the experiment, the crushed hematite ore from a dressing plant was used to mix the materials with a maximum particle size of 8mm, and the Mohs hardness of the ore to be ground was measured to be 5.6.

[0018] The processing steps are:

[0019] (1) Move the heap three times to mix the above-mentioned hematite ore evenly, that is, slowly pour the ore sample to the center point to form a conical ore heap, and then move the ore heap from two relative positions at the bottom of the cone along the same direction The ore samples are scooped up in turn and placed at another central point nearby to form a new conical ore heap. Mix in this way for 3 times to mix the materials evenly. The mixed ore sample is divided by the stack cone quartering method, that is, the mixed material is piled into a cone shape, a thin plate is inserted into the half of the total height of the bottom of the ore pile, and the ore pile is expanded by rotating the thin plate Into a flat shape, draw a ...

Embodiment 2

[0027] Method is with embodiment 1, and difference is:

[0028] (1) Raw material: a foreign magnetite ore, the ore Mohs hardness is 5.5, and the maximum particle size of the ore is 13mm;

[0029] (2) Calculate the hardness coefficient of the ore to be ground to be 1.0;

[0030] (3) Use the stack shifting method to mix the material 3 times, and take out 33.8kg of qualified samples and sieve after the mixed material is shrunk 3 times by the heap cone quartering method;

[0031] (4) The size of the standard sieve hole used when screening the raw materials is 12.5mm, 10mm, 8mm, 6mm, 5mm, 3mm, 2mm, 1mm;

[0032] (5) According to the screening results, the raw materials are divided into 4 particle grades, specifically -13.0mm+10mm, -10.0+5.0mm, -5.0+2.0mm, and -2.0mm;

[0033] (6) Carry out particle size sieve analysis to each single particle size material in step (5), obtain P 80 They are: 12.68mm, 9.05mm, 4.54mm, 1.75mm.

[0034] (7) According to Bond's simple empirical formul...

Embodiment 3

[0037] Method is with embodiment 1, and difference is:

[0038] (1) Raw materials: a certain domestic chalcopper ore with a hardness of 4.4 and a maximum particle size of 15mm.

[0039] (2) Calculate the hardness coefficient of the ore to be ground: 0.8.

[0040] (3) Use the stack shifting method to mix the material 3 times, and take out 45 kg of qualified samples after the mixed material is shrunk 3 times by the heap cone quartering method and sieves;

[0041] (4) The standard sieve mesh sizes used when screening the raw materials are 12.5, 10, 8, 6, 5, 3, 2, 1mm.

[0042] (5) According to the screening results, the raw materials are evenly divided into 4 particle grades, specifically: -15.0+10.0mm, -10.0+5.0mm, -5.0+2.0mm, -2.0mm.

[0043] (6) Carry out particle size sieve analysis to each single particle size material in step (5), obtain P 80 They are: 13.90mm, 9.38mm, 4.23mm, 1.65mm.

[0044] (7) According to Bond's simple empirical formula and the hardness coefficient...

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PUM

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Abstract

The invention relates to a method for rapidly determining the size and proportion of an ore grinding medium of a first-stage ball mill. The method comprises the following steps: dividing a material into materials of a plurality of grades according to the particle size composition of an ore grinding material; determining and measuring the Mohs hardness of ore to be ground and the particle size composition of a material of each particle grade, calculating the ball diameter of the material of each particle grade by using a Bundy simple empirical formula and the Mohs hardness of the ore to be ground, and calculating the optimal proportion of grinding medium according to the content of each particle grade in the ore to be ground. The method disclosed by the invention has the advantages that (1)the method disclosed by the invention has good adaptability to materials with the maximum particle size of 5-25mm; (2) according to the method disclosed by the invention, the proper size and proportion of a steel ball medium for ore grinding can be quickly determined by using simple ore hardness test, size fraction sieve analysis experiment and theoretical calculation, the steps are simple, the period is short, and the production time can be saved, and (3) the proper size and proportion of steel balls are determined according to the ores with different types and different particle sizes suchthat the production time is saved, and the ore grinding efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for determining the size and ratio of a grinding medium of a one-stage ball mill. Background technique [0002] The grinding process is a complex and changeable process with many influencing factors, among which the size of the grinding medium and its proportioning system have the most significant impact on the grinding efficiency and the degree of dissociation of mineral monomers. The size of the steel ball is single (the size of the ball milling medium is generally Φ120mm or Φ100mm), the grinding efficiency is low, and the energy consumption is high; however, the appropriate medium size and proportion are determined through the optimization of the grinding industrial test, and the cycle is too long, which affects the production activities. Work properly. Therefore, it is very necessary to invent a method for quickly determining the size and prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20B02C17/20B02C17/18B02C17/10
CPCB02C17/10B02C17/18B02C17/20Y02P40/10
Inventor 徐冬林王长艳余建文盖壮韦文杰亢旭高鹏张玲
Owner ANSTEEL GRP MINING CO LTD
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