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Method for improving utilization coefficient of primary ball mill in grinding separation process

A technology of utilization factor and secondary ball milling, applied in the field of metallurgical mining engineering, can solve the problems of increasing the utilization factor of ball mills, and achieve the effect of reducing unit ball consumption and power consumption

Pending Publication Date: 2022-03-04
TAIYUAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the basis of maintaining the original grinding and separation process, reducing the size of the incoming grinding after multiple breaks may not be able to improve the utilization factor of the primary ball mill. The main reason is the grinding capacity of the second or third stage after the first stage of grinding Restriction, that is, the production process with a big mouth and a small belly has also become the main reason for restricting a significant increase in the utilization coefficient of a ball mill

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In a dressing plant, the raw ore magnetic iron grade is only 14%. The original beneficiation process is a two-stage grinding and classification four-stage separation process. The first stage grinding is two MQG2136 ball mills with a total volume of 21.60m³, and the second stage is two MQY1854 ball mill, the total volume is 27m³, and the final grinding fineness is -0.074mm76%. Annual production of 130,000 tons of iron concentrate powder with a grade of 65%. The utilization coefficient of primary ball mill is 3.34t / m³h.

[0030] Applying the present invention, 1) reducing the classification particle size of the first stage of grinding from -0.074mm45% to the level of -0.074mm38%, and determining the maximum processing capacity of the first stage of grinding machine to be 98.50t / h according to the calculation of the grinding power index.

[0031] 2) Increase the magnetic field strength of the first-stage magnetic separator from 79kA / m to 180kA / m, and control the magnetic ...

Embodiment 2

[0035] In a dressing plant, the raw ore magnetic iron grade is only 12%. The original beneficiation process is a two-stage grinding and classification four-stage separation process. The first stage grinding is two MQG2236 ball mills with a total volume of 22.60m³, and the second stage is two MQY2145 ball mill, the total volume is 27m³, and the final grinding fineness is -0.074mm79%. Annual production of 110,000 tons of iron concentrate powder with a grade of 65%. The utilization factor of primary ball mill is 2.70t / m³h.

[0036] Applying the present invention, 1) reducing the classification particle size of the first stage of grinding from -0.074mm45% to the level of -0.074mm38%, and determining the maximum processing capacity of the first stage of the mill to be 83.17t / h according to the calculation of the grinding work index.

[0037] 2) Increase the magnetic field strength of the first-stage magnetic separator from 79kA / m to 200kA / m, and control the magnetic iron grade of ...

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PUM

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Abstract

The invention relates to a metallurgical mine engineering technology, in particular to a method for improving the utilization coefficient of a primary ball mill in a grinding separation process, which comprises the following steps of: 1, roughening the grading granularity of primary grinding ore; 2, according to the fact that the specific magnetization coefficient of the lean magnetite is low when the lean magnetite is coarse, the magnetic field intensity needs to be increased when the separation recovery rate is increased; 3, if the whole production process is two-stage ore grinding, the number of two-stage mills is increased; and 4, if the whole production process is three-section ore grinding, the grading particle size of two-section ore grinding can be coarsened. After the technology provided by the invention is adopted, the utilization coefficient of the first-stage ball mill of the Tai steel mining branch company is increased from 3.43 t / mh to 4.27 t / mh, the utilization coefficient of the ball mill is increased by 24.49%, the unit consumption of steel balls is reduced from 1.03 kg / t to 0.969 kg / t, and the unit consumption of electricity is reduced from 17.28 kwh / t to 16.19 kwh / t.

Description

technical field [0001] The invention relates to metallurgical mine engineering technology, in particular to a method for improving the utilization factor of a primary ball mill in a grinding process. Background technique [0002] In the grinding and dressing production in metallurgical and mining engineering, the production cost of the grinding operation accounts for more than 60% of the whole dressing production cost. Therefore, the dressing production enterprises have always attached great importance to improving the utilization factor of the ball mill, which is an economic and technical indicator that marks the level of production efficiency. . However, due to the limitation of product quality requirements, the requirements of final grinding particle size limit the random increase of the utilization factor of ball mills. In particular, with the increase of mining depth, most mining enterprises generally have finer mineral distribution particle size and keep the quality o...

Claims

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Application Information

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IPC IPC(8): B03C1/30B03B7/00B03B9/00B02C25/00
CPCB03C1/30B03B7/00B03B9/00B02C25/00
Inventor 王志东刘慈光刘俊平李红红
Owner TAIYUAN IRON & STEEL GROUP