Pretreatment of chromium-bearing metal scrap to remove chromium

Details Pretreatment of chromium-bearing metal scrap to remove chromium Pretreatment of chromium-bearing metal scrap to remove chromium

1993-08-26

1995-01-17

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 2306

Patent

active

053822781

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.

REFERENCES:
patent: 3158464 (1964-11-01), Chynoweth
patent: 4466826 (1984-08-01), Vartiainen
Kenworthy et al., Experimental Extraction of Strategic Components From S-816 Alloy Scrap, Rpt. of Invest. 5786, Br. of Mines, U.S. Dept. of Int., Nov. 1959.
Kusik et al., Pyrometallurgical Recovery of Chromium From Scrap Metals: Laboratory Studies, Rpt. of Invest. 8571, Br. of Mines, U.S. Dept. of Int., Oct. 1981.

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