Pretreatment of chromium-bearing metal scrap to remove chromium
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United States of America Patent
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Jan 17, 1995
Issued Date -
N/A
app pub date -
Aug 26, 1993
filing date -
Jun 16, 1992
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Abstract
A process for protreating chromium-beating metal scrap comprises charging the chromium-bearing metal scrap with an iron oxide-bearing 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 sing 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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