Details:

Personal Author:
Simpson, W. W. (Wilfred W.) ; Staker, W. L. (W. Lyman) ; Sandberg, R. G. (Richard G.)
Simpson, W. W. (Wilfred W.) ; Staker, W. L. (W. Lyman) ; Sandberg, R. G. (Richard G.) Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"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." - NIOSHTIC-2

NIOSHTIC no. 10005449


Subject:
[+]
Calcium Sulfide.
Cyanide Process.
Mercury -- Metallurgy.
Precipitation (Chemistry)
Slurry.

Series:
Report of investigations (United States. Bureau of Mines) ; 9042
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:891ff8caeb54f2e6c9544c9fa627a569e9f853a66443e279fba396a5fc384f61
File Type:

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