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Using Oxygen to Reactivate a Nearly Dormant Copper Sulfide Leach.

Authors
Madsen-BW; Groves-RD
Source
NTIS: PB 244 370 :9 pages
Link
NIOSHTIC No.
10007636
Abstract
A nearly dormant copper sulfide pilot-scale experimental leach containing 8.7 Tons of ore was injected with oxygen to determine its effect on the copper-leaching rate. Prior treatment of the uncrushed 0.25-percent-copper, mine-run stripping material consisted of 461 days of acid ferric sulfate leaching, which extracted 47 percent of the total copper. The permeability of the bed had decreased, and the percolation rate had decreased from an initial 20 gallons to 0.8 Gallon per square foot per day. Copper extraction had nearly stopped. After injecting oxygen into the ore column and leaching for 30 days, the percolation rate was increased to 6 gallons per square foot per day. In an additional 298 days of leaching, an additional 40.7 percent of the copper was extracted. The improved leaching after the use of oxygen is attributed to stimulated bacterial action, better oxidation, and increased permeability.
Publication Date
19750101
Document Type
IH; Report of Investigation;
Fiscal Year
1975
NTIS Accession No.
PB-244370
NTIS Price
A02
Identifying No.
RI 8056
NIOSH Division
SLRC;
Source Name
NTIS: PB 244 370
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