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Method for producing nano-iron powder

A production method and nano-iron powder technology are applied in the field of carbonyl iron production of nano-iron powder, which can solve the problems of insufficient particle size of iron powder, easy oxidation of powder, poor activity, etc., and achieve stable physical and chemical properties, easy control, and avoidance of two problems. The effect of secondary pollution

Inactive Publication Date: 2007-04-18
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when using the existing technology to prepare ultra-fine iron powder, the iron powder produced has the disadvantages of insufficient particle size, poor activity, poor magnetic properties, and the powder is easily oxidized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] When the decomposer is preheated to 220°C, the gas with carbonyl iron content of 10% and CO content of 90% is fully mixed in the gas buffer tank to prepare mixed steam, which is passed into the decomposer at a flow rate of 1m / s. When the temperature of the decomposer is controlled to be 220~230℃, and the pressure of the decomposer is 5KPa, the carbonyl iron in the mixed gas is decomposed in the molecular order to form ultrafine iron powder with a particle size of 20~50nm. Narrow, high activity, the carbon monoxide gas released by decomposition is recovered into the gas storage tank after dust collection.

Embodiment 2

[0017] When the decomposer is preheated to 280°C, the gas with carbonyl iron content of 30% and CO content of 70% is fully mixed in the gas buffer tank to prepare mixed steam, which is passed into the decomposer at a flow rate of 2m / s. When the temperature of the decomposer is controlled to be 280~290℃, and the pressure of the decomposer is 15KPa, the carbonyl iron in the mixed gas is decomposed in the molecular order to form ultrafine iron powder with a particle size of 50~80nm. Narrow, high activity, the carbon monoxide gas released by decomposition is recovered into the gas storage tank after dust collection.

Embodiment 3

[0019] When the decomposer is preheated to 330°C, the gas with carbonyl iron content of 50% and CO content of 50% is fully mixed in the gas buffer tank to prepare mixed steam, which is passed into the decomposer at a speed of 3m / s, When the temperature of the decomposer is controlled to be 330~350℃, and the pressure of the decomposer is 55KPa, the carbonyl iron in the mixed gas is decomposed in the molecular order to form ultrafine iron powder with a particle size of 80~100nm. Narrow, high activity, the carbon monoxide gas released by decomposition is recovered into the gas storage tank after dust collection.

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Abstract

A process for preparing Fe nanoparticles from carbonyl iron includes such steps as heating the carbonyl iron to become vapor, mixing it with CO gas, feeding the mixture into a decomposing apparatus, and hot decomposing while controlling the internal temp and pressure to be 150-400 deg.C and 1-10 KPa.

Description

technical field [0001] A method for producing nano iron powder relates to a method for producing nano iron powder with carbonyl iron by adopting a carbonyl method. Background technique [0002] Iron powder is widely used in powder metallurgy, magnetic materials, military industry, steel, food and other fields. At present, the methods of producing iron powder include electrolysis, chemical reduction and atomization. In foreign countries, BASF companies have used the carbonyl method to produce iron powder in large quantities. The products are characterized by good activity, fine particle size, large specific surface area and good magnetic properties. The use of carbonyl method to produce nano-iron powder has not been reported. At present, when using the existing technology to prepare ultra-fine iron powder, the produced iron powder has insufficient particle size, poor activity, poor magnetic properties, and the powder is easily oxidized. SUMMARY OF THE INVENTION [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30
Inventor 李永军张强林谭世雄肖冬明王多冬刘军位李朝平王良甘振君刘俊
Owner JINCHUAN GROUP LIMITED
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