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Selective extraction of metals from zinc concentrate by association of chemolithotrophic bacteria

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Abstract

Ability for selective extraction of copper and zinc from zinc concentrate using association of chemolithotrophic bacteria was investigated. In the presence of bacterial association, the rate of leaching of zinc, copper, and iron was increased 3-fold, 4–5-fold, and 2-fold, respectively. The results indicate the maximum dissolution rate for zinc, then followed by copperand iron. It was revealed that addition of Fe3+ 2 g/l resulted in reduction of iron leaching and in 3-fold increase of leaching rate of copper at constant dissolution rate of mineral zinc. It is suggested that the intensification of copper leaching is connected with the activity of sulfur-oxidizing bacteria able to activate the mineral surface via elimination of passivation layer of elemental sulfur. It was concluded that sulfur-oxidizing bacteria play a significant role in copper leaching from zinc concentrate. A unique strain of mesophile sulfur-oxidizing bacteria was isolated from leaching pulp of zinc concentrate; in the perspective, it may serve as efficient candidate for performing of selective extraction of copper from zinc concentrate.

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Authors and Affiliations

  1. Center of Microbiology and Microbial Depository, National Academy of Sciences of Armenia, Arznii Highway, Abovyan, Kotayk Marz, 2201, Armenia

    N. S. Vardanyan & A. K. Vardanyan

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  1. N. S. Vardanyan
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  2. A. K. Vardanyan
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Correspondence to N. S. Vardanyan.

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Original Russian Text © N.S. Vardanyan, A.K. Vardanyan, 2011, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2011, Vol. 47, No. 5, pp. 566–571.

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Vardanyan, N.S., Vardanyan, A.K. Selective extraction of metals from zinc concentrate by association of chemolithotrophic bacteria. Appl Biochem Microbiol 47, 515–519 (2011). https://doi.org/10.1134/S0003683811050140

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