Method for producing metallic chromium

A technology of metal chromium and chromium oxide, applied in the field of producing metal chromium, can solve the problems of large quantity and high production cost

Inactive Publication Date: 2004-11-03
凌海沈宏铬业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires a large amount of high-purity hydrogen, resulting in high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Featured Cr 2 o 3 Content greater than 99.50%, 100 kg of chromium oxide with a particle size of 325 meshes, 23.7 kg of carbon powder with a carbon content of 99.2% and a total content of Fe, Si and Al of less than 0.1% (added in a theoretical amount of 99.8%), after simple mixing, Put it into a ball mill with a diameter of 1000mm and 150kg of 5-50mm agate balls. After grinding and mixing for 2 hours, the briquetting is formed. The diameter of the block is 150mm and the density is 2.95g / cm 3 .

[0019] Put the block into a vacuum furnace, evacuate to 250Pa, heat up to 1500°C, keep warm for 6 hours, the vacuum degree reaches 200Pa, cool down to 1430°C, keep warm for 5 hours, the vacuum degree reaches 20Pa, cool down to 200°C and leave the furnace.

[0020] After determination, the main chemical components of the product are as follows:

[0021] Cr: 99.5%, O: 0.35%, C: 0.017%, Al: 0.02%

Embodiment 2

[0023] Featured Cr 2 o 3 Content greater than 99.70%, 100 kg of chromium oxide with a particle size of 325 meshes, 23.8 kg of carbon powder with a carbon content of 99.4% and a total content of Fe, Si and Al of less than 0.1% (added in a theoretical amount of 100.2%), after simple mixing, Put it into a ball mill with a diameter of 1000mm and 150kg of 5-50mm agate balls. After grinding and mixing for 2 hours, the briquetting is formed. The diameter of the block is 150mm and the density is 2.95g / m 3 .

[0024] Put the material block into a vacuum furnace, vacuumize to 200Pa, heat up to 1520°C, keep warm for 6 hours, the vacuum degree reaches 200Pa, cool down to 1450°C, keep warm for 5 hours, the vacuum degree reaches 5Pa, cool down to 200°C and leave the furnace.

[0025] After determination, the main chemical components of the product are as follows:

[0026] Cr: 99.6%, O: 0.14%, C: 0.02%, Al: 0.015%

Embodiment 3

[0028] Featured Cr 2 o 3 Content greater than 99.70%, 100kg of chromium oxide with a particle size of 325 meshes, 23.60kg of carbon powder with a carbon content of 99.4% and a total content of Fe, Si and Al of less than 0.1% (added according to the theoretical amount of 99.5%), mixed briquetting with example 1.

[0029] Put the block into the vacuum furnace, pump the vacuum to 200Pa, heat up to 1550°C, keep the temperature for 6 hours and 10 minutes, the vacuum degree reaches 200Pa, cool down to 1400°C, keep the temperature for 5 hours and 30 minutes, the vacuum degree reaches 30Pa, and cool down to 200°C out of the oven.

[0030] After determination, the main chemical components of the product are as follows:

[0031] Cr: 99.15%, O: 0.42%, C: 0.02%, Al: 0.02%.

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Abstract

The present invention is carbon reducing process of producing metal chromium and can prepare metal chromium product with Cr content higher than 99 %, C content less than 0.02 % and O content less than 0.5 %.

Description

technical field [0001] The invention relates to a method for producing metallic chromium by reducing chromium oxide with carbon. The Cr content of the metal chromium produced by the method is greater than 99.0%, the C content is less than 0.02%, and the oxygen content is less than 0.5%. Background technique [0002] Metal chromium is widely used in the fields of metallurgy, chemical industry, aerospace and refractory materials. The current production methods of metal chromium include thermite method, electrolysis method and carbon reduction method. [0003] The thermite method consumes a large amount of valuable aluminum powder, and introduces a large amount of impurities such as Fe, Si, and Al into the product, and the recovery rate of the product is not high, usually not more than 88%. [0004] The advantage of the electrolysis method is that the product has high purity and is easy to break. However, due to the high oxygen content in the process of electrolytic chromium,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/32
Inventor 蒋兴东周瑞关振波王英礼
Owner 凌海沈宏铬业有限公司
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