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Dual Leaching Method for Recovering Silver and Manganese from Domestic Manganiferous Silver Deposits.

Authors
Pahlman-JE; Rhoades-CA; Chamberlain-PG
Source
MISSING :8 pages
Link
NIOSHTIC No.
10005967
Abstract
The Bureau of Mines has conducted research on a dual leaching method that offers the potential for the economic recovery of the silver and manganese contained in some domestic manganiferous silver deposits. The method consists of an initial leach of manganese with aqueous sulfur dioxide (so2) followed first by a neutralization rinse, and then by a second leach with cyanide solution for the extraction of silver. Refractory silver in these ores was either (1) intimately associated with the manganese, (2) chemically resistant to cyanide leaching, or (3) rendered inaccessible to cyanide leach solution by the surrounding manganese mineralization. Less then 10 pct of the silver was extracted when minus 2.5- Plus 1.3-Cm ore pieces were leached directly with cyanide. However, extractions of 25 to 82 pct of the silver and 65 to 96 pct of the manganese were attained in laboratory column-leach tests using the dual leaching method on equivalent-sized ore pieces from seven domestic deposits.
Publication Date
19870101
Document Type
IH; Report of Investigations
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
RI 9126
NIOSH Division
TCRC;
Source Name
MISSING
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