Process for recovering precious metals from sulfide ores

Details Process for recovering precious metals from sulfide ores Process for recovering precious metals from sulfide ores

1990-02-28

1991-12-24

Weisstuch, Aaron

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75634, 75632, 75633, 75643, 75648, 423 40, 423 39, 423 48, 423 46, 423 23, 423147, 423103, C22B 1112

Patent

active

050749102

ABSTRACT:
The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at a temperature between 300.degree. and 600.degree. C. while stirring. The process converts precious metals in the elemental and sulfide forms into precious metal chlorides which are recovered by subsequent processing steps.

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