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Copper Mineral Reactions in Supercritical and Subcritical Water.

Authors
Isaacson-AE; Seidel-DC
Source
Process Mineralogy IX Miner Met and Mater Soc 1990 :343-357
Link
NIOSHTIC No.
10008200
Abstract
The U.S. Bureau of Mines is studying the effect of supercritical water at 400 deg c and 3,500 psi and of subcritical water at lower temperatures and pressures on mixtures of minerals and metals to determine the possible applications of water at high temperature and pressure for processing these materials. This research was conducted using a flow-through bench-scale system. Copper-bearing minerals studied were chalcocite, chalcopyrite, covellite, and cuprite. In general, mixtures of copper minerals and pyrite reacted to form bornite. Intermediate phases formed were chalcopyrite and digenite. Similar reactions occurred between pyrite and metallic copper. A mixture of chalcopyrite and pyrite was inert in supercritical water. The reaction between cuprite and metallic zinc yielded metallic copper. The cuprite was reduced by hydrogen generated by the reaction between metallic zinc and water. None of the reactions occurred exclusively in supercritical water; all also occurred in water at high temperature and pressure below the critical point. Experimental results showed that a dual-reaction process, consisting of solid-state diffusion and fluid transport, was occurring.
Publication Date
19900101
Document Type
OP;
Fiscal Year
1990
NTIS Accession No.
NTIS Price
Identifying No.
OP 158-90
NIOSH Division
SLRC;
Source Name
Process Mineralogy IX; Miner., Met. and Mater. Soc., 1990, PP. 343- 357
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