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Selective electrowinning of silver and gold from cyanide process solutions.

Authors
Nehl-FH; Murphy-JE; Atkinson-GB; Walters-LA
Source
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9464, 1993 Jan; :1-7
NIOSHTIC No.
10004058
Abstract
The U.S. Bureau of Mines investigated the selective electrowinning of Ag and Au from cyanide solutions contaminated with Cu with the goal of decreasing the amount of Cu codeposited. Decreasing Cu codeposited will reduce refinery costs. Direct current was applied to the cell in pulsed and square wave voltages at 0.070 A. h per 150 mL of solution. Times tested for each cycle ranged from 1 to 10,000 ms. Graphite, lead, and stainless steel were evaluated as electrode materials. Square wave electrowinning at 70" C gave the best separation of Ag and Au from Cu. Applying 25 V during the duty cycle, 0.0 V the rest of the period, a duty cycle of 10 to 30 pet, and a period of 100 to 1,000 IDS gave the following results: Ag concentrations decreased from 34 to 0.1 microg/mL, Au concentrations decreased from 54 to 0.2 microg/mL, and Cu concentrations remained almost constant at 560 microg/mL.
Keywords
Mining-industry; Metallurgy; Metallurgical-processes; Electrochemical-reactions; Electrolytic-refining
CAS No.
7440-22-4; 7440-50-8
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-202703
NTIS Price
A03
Identifying No.
RI-9464
NIOSH Division
RERC
Source Name
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9464
State
NV
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