Topochemical transformation of enargite into copper oxide by hypochlorite leaching

被引：51

作者：

Viñals, J

Roca, A

Hernández, MC

Benavente, O

机构：

[1] Univ Barcelona, Dept Chem Engn & Met, E-08028 Barcelona, Spain

[2] Univ Catolica Norte, Dept Met Engn, Antofagasta, Chile

来源：

HYDROMETALLURGY | 2003年 / 68卷 / 1-3期

关键词：

arsenic; enargite; removal; photoelectron spectroscopy;

D O I：

10.1016/S0304-386X(02)00200-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The kinetics of leaching of enargite (Cu3AsS4) were studied in NaOCl solution for ranges of 20-60 degreesC, 0.07-0.47 M ClO- and 0.003 - 0.03 M OH-. The reaction is topochemical in nature with enargite particles converted to crystalline CuO. Complete conversion occurs according to: Cu3AsS4 + 11OH(-) + 35/2ClO(-) - 3CuO + AsO43- + 4SO(4)(2)- + 11/2H(2)O + 35/2Cl(-) The very fast reaction rates were limited by the chemical reaction; the kinetic equation was found to be: 1-(1-X)(1:3) = (3.57 x 10(2)exp(-58400/RT) / r(0) ) [ClO-](1:2)[OH-](1.2)t A proposed electrochemical mechanism and a surface study by XPS was discussed. This leaching process could be used to remove arsenic from copper concentrates containing enargite. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：183 / 193

页数：11

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[Anonymous], ARSENIC METALLURGY F

[2]

COTTON FA, 1969, QUIMICA INORGANICA A

[3]

DUTRIZAC JE, 1972, CAN METALL QUART, V11, P469

[4] Chemical and biological leaching of enargite [J].