Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1997-06-17
1999-08-17
Bos, Steven
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 32, C22B 1100
Patent
active
059390344
ABSTRACT:
The process of recovering precious metals from ores containing precious metals, such as gold and silver, from an aqueous ammoniacal thiosulfate leach solution to provide a significant practical and economical process for the recovery of gold or silver is disclosed. After leaching of the ore with an aqueous ammoniacal thiosulfate solution, the leach solution is contacted with a precious metal extraction reagent to extract the precious metal values from the leach solution, after which the precious metal values are stripped from the extraction reagent to form a concentrated solution of the precious metal values from which the precious metals may be recovered by conventional methods such as electrolysis. The extraction reagents are those having guanidyl functionality or a quaternary amine functionality mixed with a weak organic acid such as a phenol.
In the process, novel thiosulfate complexes of the precious metals are formed with the quanidyl or the quaternary amine extractants.
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International Search Report for PCT/US97/08654 mailed Aug. 29, 1997.
Sierakoski J. Michael
Virnig Michael J.
Bos Steven
Henkel Corporation
Jaeschke Wayne C.
Span Patrick J.
Szoke Ernest J.
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