Recovery of precious metals from refractory low-grade ores

Details Recovery of precious metals from refractory low-grade ores Recovery of precious metals from refractory low-grade ores

1987-01-28

1988-03-15

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 2, 75 7, 75 9, 75101R, 75105, 75115, 423 29, 423 30, 423 31, 423 41, 423 45, 423 47, C22B 1100

Patent

active

047311142

ABSTRACT:
Low-grade refractory gold ores, which may also contain silver and other metal values are treated by partial roasting of concentrate to remove controlled amounts of sulfur and carbon, then oxygen pressure leached to oxidize further amounts of sulfur and carbon and to dissolve base metals and a portion of any silver present, and the residue is then cyanided to dissolve gold and remaining silver which are then recovered.

REFERENCES:
patent: 1257612 (1918-02-01), Kirchen et al.
patent: 1562942 (1925-11-01), Coolbaugh et al.
patent: 2759809 (1956-08-01), Aimone et al.
patent: 4293530 (1981-10-01), Livesey-Goldblatt
patent: 4431614 (1984-02-01), Makipirtti et al.
patent: 4497778 (1985-02-01), Pooley

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