TY - JOUR
T1 - Copper extraction from chloride solutions by evaporation and reduction with hydrogen
AU - Kekesi, Tamas
AU - Mimura, Kouji
AU - Isshiki, Minoru
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1995
Y1 - 1995
N2 - In order to obtain a metallic product from the CuCl2-HCl solution purified by anion-exchange separation, the straightforward method of evaporation to dryness and reduction with H2 was investigated. Thermodynamic study of the probable reactions in the Cu-Cl-H-O system pointed out the feasibility of the direct reduction of CuCl2. In order to find out the practical reduction rates and effective recoveries, the process was tested under different conditions. The first step of reduction, which results in the conversion of CuCl2 to CuCl, is readily executable at temperatures slightly below the CuCl-CuCl2 eutectic point. The second step, which results in the metallic product, requires higher temperatures, though safely below the melting point of CuCl. Kinetic analysis of the critical second step provided an activation energy of 138 kJ mol-1 which could be interpreted in terms of a chemical reaction dominated mixed mechanism.
AB - In order to obtain a metallic product from the CuCl2-HCl solution purified by anion-exchange separation, the straightforward method of evaporation to dryness and reduction with H2 was investigated. Thermodynamic study of the probable reactions in the Cu-Cl-H-O system pointed out the feasibility of the direct reduction of CuCl2. In order to find out the practical reduction rates and effective recoveries, the process was tested under different conditions. The first step of reduction, which results in the conversion of CuCl2 to CuCl, is readily executable at temperatures slightly below the CuCl-CuCl2 eutectic point. The second step, which results in the metallic product, requires higher temperatures, though safely below the melting point of CuCl. Kinetic analysis of the critical second step provided an activation energy of 138 kJ mol-1 which could be interpreted in terms of a chemical reaction dominated mixed mechanism.
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U2 - 10.2320/matertrans1989.36.649
DO - 10.2320/matertrans1989.36.649
M3 - Article
AN - SCOPUS:0029304523
VL - 36
SP - 649
EP - 658
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 5
ER -