Bioleaching of Orpiment (As2S3) in Absence of Fe3+

Guang Ji Zhang; Qiao Yang; Chao Yang

doi:10.4028/www.scientific.net/AMR.1130.363

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Primary Copper Ore Leaching by Leaching Solution Adjusted Oxidation-Reduction Potential in Column
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Bioprocess for Leaching of Copper Concentrate
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Study on Bioleaching of Sulfur in Iron Ore by Mixed Culture
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1130Bioleaching of Orpiment (As2S3) in Absence of Fe3+

Bioleaching of Orpiment (As₂S₃) in Absence of Fe³⁺

Abstract:

Abstract Orpiment (As₂S₃) is one of the major arsenic sulfide minerals, which can be dissolved by ferric ion and proton produced by the bacteria, and the main intermediates were polysulﬁdes and elemental sulfur. In this study, two strains (Acidithiobacillus thiooxidans and Acidthiobacillus caldus) were used to bioleach the orpiment without iron ions addition. The experimental results show that both the two strains can grow in the pulp and dissolve the orpiment. In the bioleaching, it was found that pH decreased, the concentration of arsenic increased significantly and no elemental sulfur is detected on the surface of the residuals. At the same time the density of the planktonic bacteria increased obviously. These results indicate that the orpiment can be dissolved by the bacteria easily in absence of Fe³⁺. This study suggests that the release of arsenic which is from orpiment in the mining tailings can be faster than expected in open air.

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Periodical:

Advanced Materials Research (Volume 1130)

Pages:

363-366

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1130.363

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Online since:

November 2015

Authors:

Guang Ji Zhang, Qiao Yang, Chao Yang

Keywords:

Acidithiobacillus thiooxidans, Acidthiobacillus caldus, Arsenic, Bioleaching, Orpiment

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