Pretreatment of chromium-bearing metal scrap to remove chromium
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
Oct 7, 1992
filing date -
Jun 16, 1992
priority date (Note) -
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Abstract
A process for pretreating chromium-bearing metal scrap comprises charging the chromium-bearing metal scrap with fayalite slag into a pyrometallurgical furnace, heating and melting the charge, and maintaining the charge molten at a temperature of at least 1550.degree. C. for a predetermined time period to allow an iron oxide/chromium exchange reaction to take place oxidizing and removing chromium to the slag phase while reducing iron to the metal phase to form an alloy product containing Fe along with the Ni and/or Co, and removing the alloy product for further processing for recovery of metal values.
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