Method for producing high-purity metallic chromium
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United States of America Patent
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Mar 3, 1992
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N/A
app pub date -
Oct 25, 1990
filing date -
Nov 1, 1989
priority date (Note) -
Expired
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Abstract
High-purity metallic chromium is produced by a method of initially preparing a mixture of chromium oxide, aluminum, carbon and an easily sulfidable metallic powder, and subsequently providing a thermite-reaction with the mixture to produce thermite-crude metallic chromium and a solid solution of carbon and easily sulfidable metal. Residual impurities in the thermite-crude metallic chromium are subsequently removed by heat treating the crude metallic chromium. This method produces high-purity metallic chromium advantageous for preparing corrosion and heat resistant chromium-containing alloys.
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