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A method for controlling the bulk density of iron powder with low bulk density

A technology of loose bulk density and low bulk density is applied in the field of powder bulk density control and adjustment, which can solve the problems such as the difficulty of accurate adjustment and control of process performance indicators such as loose bulk density, change of crushing speed, and low yield.

Active Publication Date: 2021-10-12
LAIWU TAIDONG POWDER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our current control method adopts the fixed speed process of nitrogen circulation mechanical pulverizer, which has low output, high noise, low yield, and process performance indicators such as bulk density are difficult to accurately adjust and control
At present, the means of controlling the loose ratio in this industry are generally achieved by different crushing methods or by changing the crushing speed, which cannot achieve the purpose of precise control
[0003] With the continuous improvement of the technical level and product structure of many product manufacturers, the requirements for process performance indicators such as bulk density are becoming more and more stringent. The method of using a nitrogen circulation mechanical pulverizer to control the bulk density with a fixed speed process has seriously restricted the low bulk density. The development of powder industry

Method used

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  • A method for controlling the bulk density of iron powder with low bulk density
  • A method for controlling the bulk density of iron powder with low bulk density

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The production of 0.8-0.9 low bulk density micro-nano powder is produced by the following steps:

[0028] 1. Feed flow rate: The qualified push boat furnace powder cake is transported to the crushing silo by driving and crushed into a powder with a particle size of 10-15mm, which is sent to the crusher by the anti-blocking tube feeder for crushing and grinding. The adjustment range of the anti-blocking pipe feeder is 0-30HZ.

[0029] 2. Equipment parameters: The crusher adopts nitrogen circulation mechanical crushing classifier, and the crushing motor is Y 2 -200L2-237KW; anti-blocking pipe feeder is ZGFE-2L type, feeding capacity > 300kg / h; Roots blower motor Y3-180L-4 22KW; HL--100 pulse bag filter handles air volume of 2040m 3 / h, the suction volume is controlled by a DN100 manual butterfly valve.

[0030] 3. Parameter control: Open the nitrogen valve to start the Roots blower and crusher. Adjust the speed of the crusher to 25HZ, open the anti-blocking pipe, adjus...

Embodiment 2

[0036] The production of 1.0-1.1 low bulk density micro-nano powder is produced by the following steps:

[0037] 1. Feed material: Qualified push boat furnace powder cake is hoisted by driving to the crushing silo and crushed in the silo into powder with a particle size of 10-15mm. The adjustment range of plugging feeder is 0~30HZ.

[0038] 2. Equipment parameters: The crusher adopts nitrogen circulation mechanical crushing classifier, and the crushing motor is Y 2 -200L2-237KW; anti-blocking pipe feeder is ZGFE-2L type, feeding capacity > 300kg / h; Roots blower motor Y3-180L-4 22KW; HL--100 pulse bag filter handles air volume of 2040m 3 / h, the suction volume is controlled by a DN100 manual butterfly valve.

[0039]3. Parameter control: Open the nitrogen valve to start the Roots blower and crusher. Adjust the speed of the crusher to 30HZ, open the anti-blocking pipe, adjust the speed of the feeder to 10HZ, and adjust the speed of the classifier to 13HZ. After crushing, take...

Embodiment 3

[0046] The production of 1.1-1.2 low bulk density micro-nano powder is produced by the following steps:

[0047] 1. Feed material: Qualified push boat furnace powder cake is hoisted by driving to the crushing silo and crushed in the silo into powder with a particle size of 10-15mm. The adjustment range of plugging feeder is 0~30HZ.

[0048] 2. Equipment parameters: The crusher adopts nitrogen circulation mechanical crushing classifier, and the crushing motor is Y 2 -200L2-237KW; anti-blocking pipe feeder is ZGFE-2L type, feeding capacity > 300kg / h; Roots blower motor Y3-180L-4 22KW; HL--100 pulse bag filter handles air volume of 2040m 3 / h, the suction volume is controlled by a DN100 manual butterfly valve.

[0049] 3. Parameter control: Open the nitrogen valve to start the Roots blower and crusher. Adjust the speed of the crusher to 35HZ, open the anti-blocking pipe, adjust the speed of the feeder to 8HZ, and adjust the speed of the classifier to 15HZ. After crushing, take...

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Abstract

The invention discloses a method for controlling the bulk density of iron powder with low bulk density. The powdered cake of a qualified pusher boat furnace is hoisted by driving to a crushing silo, crushed in the silo, and then transported into a nitrogen circulation mechanical pulverizer for crushing; Adjust the frequency of the anti-blocking pipe fan at the feeding end of the nitrogen circulation mechanical pulverizer, adjust the grinding speed and adjust the fine powder input and output, and the powder after each crushing is classified by the classifier installed at the discharge port of the crusher. The powder remains in the crushing chamber for crushing, and the powder with finer particle size is deposited in the cyclone separator; after each crushing and screening, the bulk density of the undersize is checked, compared with the process requirements, and the deviation is timely Adjust the frequency conversion parameters. The purpose of the present invention is to overcome the difficulty of low output, high cost and bulk density control of current nitrogen circulation mechanical pulverizers, and to control the bulk density of iron powder in the whole process and in all directions, which can effectively and accurately control the Powder bulk density.

Description

technical field [0001] The invention relates to a process method for adjusting and controlling the bulk density of powder, in particular to a method for controlling the bulk density of iron powder with low bulk density. Background technique [0002] 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. Ultrafine iron powder is one of the basic raw materials of powder metallurgy industry. Due to its large specific surface area and activity, it has special properties such as electricity, magnetism, light, catalysis, adsorption and chemical reaction, and is widely used. The bulk density of iron powder with low bulk ratio is generally required to be between 0.8-1.6g / cm3, and the control span is relatively large. Our current control m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04
CPCB22F9/04B22F2201/02
Inventor 吕学进张正法李军苗宗新亓国瑞蒋广宇宫文国蒋浩
Owner LAIWU TAIDONG POWDER TECH