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Method for producing carbonyl iron powder

A technology of carbonyl iron powder and production method, applied in directions such as carbonyl iron, can solve the problems of flammability, high activity of carbonyl iron powder, uneven particle size of iron powder, etc., so as to reduce production cost, reduce impurity content, and avoid secondary pollution Effect

Inactive Publication Date: 2008-07-02
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, to provide a method that can effectively overcome the prior art to prepare ultra-fine carbonyl iron powder by mixing carbonyl iron gas and carbon monoxide gas into the decomposer to cause the activity of the product carbonyl iron powder Production method of carbonyl iron powder with defects of too large, flammable, and uneven particle size of iron powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] When the top of the decomposer is heated to 220°C, the carbonyl iron liquid with a flow rate of 30kg / h and a pressure of 0.4MPa is atomized by carbon monoxide with a flow rate of 30kg / h at a temperature of 110°C into mist particles with a particle size of 50μm. The mist particles are directly sprayed into the decomposer with a temperature of 220°C, and the mist particles are decomposed in the decomposer to obtain fine carbonyl iron powder with a particle size of 5-10 μm. By adjusting the pressure of carbon monoxide to change the particle size of the atomized particles, and finally to control the shape and particle size of the carbonyl iron powder, the carbonyl iron powder has stable performance and will not catch fire or explode during packaging and transportation.

Embodiment 2

[0016] When the top of the decomposer is heated to 250°C, the carbonyl iron liquid with a flow rate of 40kg / h and a pressure of 0.4Mpa is atomized by carbon monoxide with a flow rate of 20kg / h at a temperature of 110°C into mist particles with a particle size of 60μm. The mist particles are directly sprayed into the decomposer with a temperature of 240°C, and the mist particles are decomposed in the decomposer to obtain fine carbonyl iron powder with a particle size of 8 μm. By adjusting the pressure of carbon monoxide to change the particle size of the atomized particles, and finally to control the shape and particle size of the carbonyl iron powder, the carbonyl iron powder has stable performance and will not catch fire or explode during packaging and transportation.

Embodiment 3

[0018] When the top of the decomposer is heated to 260°C, the carbonyl iron liquid with a flow rate of 50kg / h and a pressure of 0.4Mpa is atomized by carbon monoxide with a flow rate of 16.7kg / h at a temperature of 110°C into mist particles with a particle size of 70μm. The mist particles are directly sprayed into the decomposer with a temperature of 240°C, and the mist particles are decomposed in the decomposer to obtain fine carbonyl iron powder with a particle size of 10 μm. By adjusting the pressure of carbon monoxide to change the particle size and shape of the atomized particles, and finally to control the shape and particle size of the carbonyl iron powder, the carbonyl iron powder has stable performance and will not catch fire or explode during packaging and transportation.

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PUM

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Abstract

The invention discloses a production method of carbonyl iron powder, which relates to a production method for preparing ultrafine carbonyl iron powder used in powder metallurgy through thermal decomposition of carbonyl iron. The invention is characterized in that the production process is that: carbonyl iron liquid is atomized by carbon monoxide and injected into a resolver to be decomposed. The carbonyl iron liquid generated by carbonylation synthesis is mixed with heated carbon monoxide according to a certain ratio to form gas-liquid mixture through flow and pressure control instead of being subject to carburation and evaporation, the gas-liquid mixture is pumped in the resolver and atomization thermal decomposition is carried out at certain temperature and pressure to obtain the carbonyl iron powder with particle size of 5-12 Mum used in powder metallurgy.

Description

technical field [0001] The invention relates to a production method of carbonyl iron powder, which relates to a production method of thermally decomposing carbonyl iron to produce superfine carbonyl iron powder for powder metallurgy. Background technique [0002] With the continuous development of powder metallurgy technology, carbonyl iron powder products are used in the manufacture of powder metallurgy parts of key parts such as national defense, aviation, automobiles, ships, etc., as well as electromagnetic fluids, magnetic materials, etc., making carbonyl iron powder with a particle size of 5-12μm The product market will continue to expand. The current process for preparing carbonyl iron is obtained by decomposing carbonyl iron gas and carbon monoxide gas after mixing. Due to the high activity of the iron powder obtained by thermal decomposition of the mixed gas, oxidation and ignition will often occur in powder placement and packaging, and there is also the danger of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16
Inventor 张强林肖冬明罗世铭甘振君胡晓平焦元刚
Owner JINCHUAN GROUP LIMITED
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