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Leaching sulfidation-partitioned chalcopyrite to selectively recover copper.

Authors
Jolly-AF; Neumeier-LA
Source
Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 9343, 1991 Jan; :1-12
Link
NIOSHTIC No.
10008552
Abstract
As a part of ongoing research into the sulfidation partitioning of selected complex minerals, the U.S. Bureau of Mines conducted research designed to selectively recover Cu from sulfidized chalcopyrite (CuFeS2). Ferric chloride (FeCl3) solutions leached >90 pct of the Cu and <20 pct (sometimes <10 pct) of the Fe in the sulfidized concentrates. Cupric chloride (CuCl2) leaches were even more selective, solubilizing essentially 100 pct of the Cu and <5 pct of the Fe. In contrast, leaching nonsulfidized CuFeS2 with either FeCl3 or CuCl2 showed that somewhat more Fe than Cu dissolved. These studies demonstrate that Cu is substantially more leachable from sulfidized CuFeS2 than from nonsulfidized CuFeS2. The Cu- and Fe-bearing constituents generated as sulfidation products, CuS (covellite) and FeS2 (pyrite), respectively, are differentially dissolved. The solubility of Fe from pyrite in sulfidized CuFeS2 is much lower than the solubility of Fe from complex nonsulfidized sulfide where Fe and Cu are bound in the same crystal lattice. Thus, the Cu dissolved selectively, producing a high-Cu filtrate from which Cu can be recovered by cementation or by electrolysis. Flotation of CuS-FeS2 mixtures indicates partitioned phases can be physically separated if effective liberation can be achieved. Magnetic separation tests yielded less promising results.
Keywords
Hydrometallurgy; Leaching; Sulfides; Extractive-metallurgy; Iron-chlorides; Copper-chlorides; Flotation; Separation; Chalcopyrite; Materials-recovery; Copper
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB92177625
NTIS Price
A03
Identifying No.
RI-9343
NIOSH Division
RORC
Source Name
Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 9343
State
MO
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