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Method for controlling primary powder apparent density accurately by utilizing ball mill

A technology of loose packing density and precise control, which is applied in grain processing, etc., can solve the problems of low output and high cost, and achieve the effect of reducing production cost, reducing production cost and controlling particle size index

Inactive Publication Date: 2014-11-19
LAIWU TAIDONG POWDER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of low output and high cost of the existing vibratory mills, and provide a method for accurately controlling the bulk density of primary powder by using a ball mill, which can effectively control the bulk density and particle composition, reduce production costs, and improve Yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Production 2.6~3.0 g / cm 3 Primary powder with high bulk density is produced by the following steps:

[0021] 1. Feed material: Qualified sponge iron is cleaned, squeezed, hammered or jaw broken into powder with a particle size of 10-15mm, which is lifted to the front silo of the ball mill, and sent to the ball mill by the vibrating feeder for grinding. The current adjustment range of the feeder is 0-30A;

[0022] 2. Equipment parameters: The ball mill adopts Φ1830×7000 grid type rolling mill, the driving motor is YJR138-8-245KW; the vibrating feeder is GZ-3 type, and the feeding capacity is 20T / h; PPS32-5 air box pulse bag type The air volume of the dust collector is 11160m 3 / h, the suction volume is controlled by DN350 manual butterfly valve.

[0023] 3. Parameter control: adjust the air volume of the dust removal to 45o, the current of the vibrating feeder to 12A, open the suction port plate, adjust the operating current of the ball mill to 390A ~ 410A, and take t...

Embodiment 2

[0030] Production 2.3~2.6 g / cm 3 Primary powder with medium bulk density is produced by the following steps:

[0031] 1. Feed material: Qualified sponge iron is cleaned, squeezed, hammered or jaw broken into powder with a particle size of 10-15mm, which is lifted to the front silo of the ball mill, and sent to the ball mill by the vibrating feeder for grinding. The current adjustment range of the feeder is 0-30A;

[0032] 2. Equipment parameters: The ball mill adopts Φ1830×7000 grid type rolling mill, the driving motor is YJR138-8-245KW; the vibrating feeder is GZ-3 type, and the feeding capacity is 20T / h; PPS32-5 air box pulse bag type The air volume of the dust collector is 11160m 3 / h, the suction volume is controlled by DN350 manual butterfly valve.

[0033] 3. Parameter control: Adjust the opening of the manual butterfly valve to 55o for dust removal and suction air volume, adjust the current of the vibrating feeder to 8A, open the suction port plate, adjust the operat...

Embodiment 3

[0040] To produce primary powder with low bulk density of 2.0-2.3, the following steps are used for production:

[0041] 1. Feed material: Qualified sponge iron is cleaned, squeezed, hammered or jaw broken into powder with a particle size of 10-15mm, which is lifted to the front silo of the ball mill, and sent to the ball mill by the vibrating feeder for grinding. The current adjustment range of the feeder is 0-30A;

[0042] 2. Equipment parameters: The ball mill adopts Φ1830×7000 grid type rolling mill, the driving motor is YJR138-8-245KW; the vibrating feeder is GZ-3 type, and the feeding capacity is 20T / h; PPS32-5 air box pulse bag type The air volume of the dust collector is 11160m 3 / h, the suction volume is controlled by a DN350 manual butterfly valve.

[0043] 3. Parameter control: adjust the operating current of the ball mill to between 280A and 300A, adjust the opening of the dust removal and suction butterfly valve to 65o, adjust the current of the vibrating feeder...

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Abstract

The invention discloses a method for controlling the primary powder apparent density accurately by utilizing a ball mill. The method comprises the following steps: (1) feeding, namely, carrying out flushing, crush breaking, hammer breaking or jaw breaking on qualified sponge iron, lifting powder with the particle size being 10-15mm to a ball milling front stock bin, conveying the powder into the ball mill by a vibration feeder, and grinding; (2) carrying out parameter control, namely adjusting the current of the vibration feeder arranged at the feeding end of the ball mill so as to control the feeding quantity, adjusting the current of the ball mill so as to control the rotation speed of the ball mill, thus controlling the grinding speed, adjusting dedusting air suction capacity so as to control the fine powder feeding quantity; (3) discharging through three parts; and (4) screening, namely after screen underflow conforming to the granularity need enters a magnetic separator at the lower part of a drum screen, carrying out magnetic separation, lifting the screen underflow to a storage bin, conveying oversized products not conforming to the granularity need to the ball milling front material feedback storage bin by a material returning belt, adding the oversized products into the ball mill quantitatively according the need of primary powder ingredients, and grinding. According to the method, the apparent density and the particle constitution can be effectively controlled, the production cost is lowered, and the yield is increased.

Description

[0001] technical field [0002] The invention relates to a method for accurately controlling the bulk density of primary powder by using a ball mill. Background technique [0003] Powder metallurgy is a new high-tech industry in my country in the 1960s, and it belongs to the high-tech project encouraged by the country during the 12th Five-Year Plan. After entering the 21st century, the powder industry has developed rapidly and the technical level has been continuously improved. At present, the production of primary powder of broken sponge iron in my country generally adopts the grinding process of vibrating mill, which has low output, high noise, harsh environment, and process performance indicators such as bulk density are difficult to accurately adjust and control. With the technical level and product structure of many product manufacturers With continuous improvement, the requirements for process performance indicators such as bulk density are becoming more and more st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C25/00
Inventor 蔺存栋吕学进赵星曹乃红刘辉王凯亓国瑞
Owner LAIWU TAIDONG POWDER TECH
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