Apparatus for producing high-purity metallic chromium
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United States of America Patent
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Dec 19, 1995
Issued Date -
N/A
app pub date -
Nov 18, 1994
filing date -
Aug 3, 1992
priority date (Note) -
Expired
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Abstract
There is proposed a novel method for manufacturing high-purity metallic chromium that can eliminate the problems of reduced heating capability of the furnace, contamination of produced metallic chromium and other disadvantages related to the operation of the furnace. According to the invention, one or more than one of easily sulfidable metals selected from Sn, Ni and Cu are added to crude metallic chromium containing impurities and the mixture is loaded into a vacuum furnace equipped with heating elements of graphite and heated to 1,200.degree. to 1,500.degree. C. in an atmosphere with reduced pressure of between 0.1 and 5 torr.
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