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Calcium Sulfide Precipitation of Mercury from Gold-silver Cyanide- leach Slurries.

Authors
Simpson-WW; Staker-WL; Sandberg-RG
Source
MISSING :8 pages
Link
NIOSHTIC No.
10005449
Abstract
During cyanidation of mercury-bearing gold-silver ores, significant amounts of mercury are extracted. The presence of mercury decreases gold loading and increases mercury stripping time on activated carbon, complicates fire refining of the gold cathodes, and creates a potential health hazard. Addition of calcium sulfide (cas) to the cyanide leach slurry precipitates the solubilized mercury but also some silver. The Bureau of Mines investigated silver loss during cas precipitation of mercury. Addition of 0.1 Lb cas per short ton ore to a mercury-bearing gold-silver ore precipitated both mercury and silver. However, if copper was added with cas, or if the ore contained copper, much of the silver loss was prevented. Addition of 235 ppm cu with 0.1 Lb/st cas, prior to carbon-in-pulp adsorption, resulted in 89- to 97-pct, 80- to 91-pct, and 0-pct adsorption of the solubilized gold, silver, and mercury, respectively, on the activated carbon.
Publication Date
19860101
Document Type
IH; Report of Investigations
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
RI 9042
NIOSH Division
SLRC;
Source Name
MISSING
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