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Rinsing of Spent Precious Metal Ores for Heap Leach Decommissioning.

Authors
Comba-PG; McGill-SL
Source
Ch 31 in Environmental Management for the 1990'S SME 1991 :7 pages
Link
NIOSHTIC No.
10011160
Abstract
Many gold-producing states are requiring rinsing of spent heaps to render the leached ore compatible with the environment and are placing restrictions on effluent ph, cyanide, and metals concentrations. Parameters that may affect efficient rinsing of heaps have been investigated by the U.S. Bureau of Mines in laboratory column studies. Rinse profiles for cyanide, metals, and ph as a function of the volume of water passed through the spent ore are presented. Fresh water rinsing of spent ore in columns showed that rinsing of cyandide was not affected by the rinse solution application rate. Interrupted rinsing with a rest period between applications reduced the volume of water required to meet effluent cyanide concentrations. Chemical oxidation of the effluent with recycle of the rinse solutions reduced effluent cyanide concentrations and the volume of waste solution generated. Water rinsing was not successful in reducing the alkalinity of the cement agglomerated ore. A dilute acid solution had to be applied after cyanide removal to reduce effluent ph levels to specified limits.
Publication Date
19910101
Document Type
OP;
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
OP 2-92
NIOSH Division
RERC;
Source Name
Ch. 31 in Environmental Management for the 1990'S; SME, 1991, PP. 225-231
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