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Method for producing iron foil by carbonylation

A technology of carbonylation and carbonyl iron, applied in the field of metallurgy, can solve the problems of high cost, heavy pollution, and high cost of steel rolling, and achieve the effects of not being easy to oxidize and spontaneously combust, reduce production costs, and simplify the process flow

Active Publication Date: 2012-11-21
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the steel rolling method is costly, difficult to control the composition, and difficult to follow-up treatment; the electrochemical refining method also has the problems of high cost and large pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 1Kg of hydrogen-activated sponge iron with 95% iron content in the synthesis kettle, and pass in CO gas with a purity of not less than 99.9%, control the pressure in the synthesis kettle to 9Mpa, and the temperature to 240°C. Sponge iron and carbon monoxide The gas undergoes selective carbonylation reaction in the synthesis kettle for 32 hours to generate carbonyl iron gas; the temperature in the synthesis kettle is naturally cooled to 40-25°C, the carbonyl iron gas decomposes to form iron foil, and nitrogen gas with a pressure of 0.3Mpa is introduced into the In the synthesis kettle, replace and remove the undecomposed carbonyl iron gas in the synthesis kettle to obtain iron foil. The size of the iron foil is 5-50mm×5-50mm×0.2-0.25mm, the weight is 0.74Kg, and the purity is 98.0%. Its surface is dense and smooth, and its thickness is uniform.

Embodiment 2

[0026] Put 1Kg of hydrogen-activated sponge iron with 97% iron content in the synthesis kettle, and feed CO gas with a purity of not less than 99.9%, control the pressure in the synthesis kettle to 15Mpa, and the temperature to 150°C. The sponge iron and carbon monoxide The gas undergoes selective carbonylation reaction in the synthesis kettle for 50 hours to generate carbonyl iron gas, and the temperature in the synthesis kettle is naturally cooled to 40-25°C, the carbonyl iron gas decomposes to form iron foil, and nitrogen gas with a pressure of 0.7Mpa is introduced into the In the synthesis kettle, replace and remove the undecomposed carbonyl iron gas in the synthesis kettle to obtain iron foil. The size of the iron foil is 5-50mm×5-50mm×0.15-0.2mm, the weight is 0.71Kg, the purity is 98.0%, the surface is dense and smooth, and the thickness is uniform.

Embodiment 3

[0028] Put 1Kg of hydrogen-activated sponge iron with 96% iron content in the synthesis kettle, and feed CO gas with a purity of not less than 99.9%, control the pressure of the synthesis kettle to 12Mpa, and the temperature to 195°C, and the sponge iron and carbon monoxide gas are synthesized Selective carbonylation reaction occurred in the kettle for 41 hours to generate carbonyl iron gas. The temperature in the synthesis kettle was naturally cooled to 40-25°C. The carbonyl iron gas was decomposed to form iron foil, and nitrogen gas with a pressure of 0.5Mpa was introduced into the synthetic In the kettle, replace and remove the undecomposed carbonyl iron gas in the synthesis kettle to obtain iron foil. The size of the iron foil is 5-50mm×5-50mm×0.1-0.15mm, the weight is 0.65Kg, the purity is 98.0%, the surface is dense and smooth, and the thickness is uniform.

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Abstract

The invention relates to a method for producing an iron foil by carbonylation. The method comprises the following steps: placing sponge iron in a synthesis kettle; introducing carbon monoxide gas into the synthesis kettle, controlling the pressure in the synthesis kettle to 9-15 MPa and the temperature in the synthesis kettle to 150-240 DEG C; and carrying out a carbonylation reaction for 32-50 hours to generate carbonyl iron gas; naturally cooling the temperature in the synthesis kettle to 40-25 DEG C, decomposing the carbonyl iron gas to form the iron foil, and introducing nitrogen with thepressure of 0.3-0.7 MPa into a reaction kettle so as to remove the undecomposed carbonyl iron gas to prepare the iron foil. By using the method, the problems that cost is high, components are difficult to control, successive treatment is difficult, pollution is serious and the like in the prior art are avoided, the iron foil the iron content in which is above 98.0% is prepared.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for preparing iron foil by carbonylation. Background technique [0002] Iron foil is mainly used for high energy storage density alkaline battery electrode skeleton material, and can also be used for special flexible packaging (fire prevention, moisture insulation, magnetic protection), magnetic shielding materials, prefabricated offset printing plate base (instead of aluminum plate base), circuit boards Preparation materials, etc. [0003] At present, the technology of preparing iron foil at home and abroad mainly adopts steel rolling method and electrochemical refining method. However, the steel rolling method has high cost, difficult to control the composition, and difficult follow-up treatment; the electrochemical refining method also has the problems of high cost and large pollution. Therefore, the iron foil process produced by the carbonyl method of the present i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B15/04
Inventor 李朝平武金升
Owner JINCHUAN GROUP LIMITED
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