Falconbridge Limited

Gary J O'Connell

David G Tisdale

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.

Pretreatment of chromium-bearing metal scrap to remove chromium

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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Sudbury, Canada

Gary J O'Connell