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Silver-catalyzed bioleaching of low-grade copper ores.: Part I: Shake flasks tests by J.A. Muñoz; D.B. Dreisinger; W.C. Cooper; S.K. Young is a Engineering article available to read on EtoBox.

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A study of the effect of different variables (inoculation, pulp density, [Ag], nutrient medium, pH and [Fe 3+ ]) on the silvercatalyzed bioleaching of a low-grade copper sulfide ore has been carried out in shake flasks. Chalcopyrite was the dominant copper mineral in the ore. Preliminary tests showed that addition of other ions (Sb, Bi, Co, Mn, Ni and Sn) did not enhance the copper dissolution rate. Conversely, an inoculation with mesophilic microorganisms and the addition of silver had a markedly catalytic effect on the extraction of copper. The kinetics of the silver-catalyzed chalcopyritic ore bioleaching was greatly affected by pulp density and silver concentration. Small amounts of silver (14.7 g Ag/kg Cu) dramatically accelerated the copper dissolution process while large amounts (294.12 g Ag/kg Cu) had an inhibitory effect. The copper dissolution rate was slightly affected in the range of pH between 1.2 and 2.5 but was significantly slower at pH 3.0. The effect of [Fe 3+ ] in the presence of silver was studied both in abiotic and biotic conditions. High ferric iron concentrations in abiotic tests recovered similar copper amounts (∼ 95%) to those obtained without or with low

Who reads Silver-catalyzed bioleaching of low-grade copper ores.: Part I: Shake flasks tests?

Author

J.A. Muñoz; D.B. Dreisinger; W.C. Cooper; S.K. Young

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-386X)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)