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

1992-10-07

1993-08-31

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 2306

Patent

active

052404960

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.

REFERENCES:
patent: 3158464 (1964-11-01), Chynoweth
patent: 4466826 (1984-08-01), Vartiainen
Kenworthy, H., et al. "Experimental Extraction of Strategic . . . " Rpt. of Invest. 5786, Br. of Mines, US Dept. of Int. Nov. 1959.
Kusik, C. L., et al., "Pyrometallurgical Recovery of Chromium . . . " Rpt. of Invest. 8571, Br. of Mines, US Dept. of Int. Oct. 1981.

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