Study on the jarosite mediated by bioleaching of pyrrhotite using Acidthiobacillus ferrooxidans

Authors

  • Kaile Zhao Central South University
  • Guohua Gu Central South University
  • Guanzhou Qiu Institute of Multipurpose Utilization of Mineral Resources
  • Xiaohui Wang Institute of Multipurpose Utilization of Mineral Resources

DOI:

https://doi.org/10.14393/BJ-v33n3-33824

Keywords:

Pyrrhotite, Bioleaching, Acidthiobacillus ferrooxidans, Jarosite

Abstract

Precipitation of jarosite is a very important phenomenon that is observed in the bioleaching of pyrrhotite by Acidthiobacillus ferrooxidans (A. ferrooxidans). Jarosite is a major secondary mineral formed in acid supergene environment by oxidation of metal sulphide. The formation of jarosite could decrease leached percentage. The Eh-pH diagram of FeS1.12-H2O showed that the thermodynamic parameters of the jarosite were exists steadily on Eh=360~800, pH=2.8~5, and the results of pH condition test is consonant with the conclusions of thermodynamic analysis. By means of XRD and SEM, it could indicate that full propagation of A. ferrooxidans in the solution is beneficial to the formation of jarosite and jarosite mediated by bacterial has a better crystalline form than that synthesized by chemical method. This study indicates that pH value and ferrous/ferric iron concentration are key factors affecting the formation of jarosite. Leached percentage is higher when frequency was set more than 2.0. It is crucial to minimize jarosite formation in order to increase factory's efficiency.

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Published

2017-05-24

How to Cite

ZHAO, K., GU, G., QIU, G. and WANG, X., 2017. Study on the jarosite mediated by bioleaching of pyrrhotite using Acidthiobacillus ferrooxidans . Bioscience Journal [online], vol. 33, no. 3, pp. 721–729. [Accessed4 December 2022]. DOI 10.14393/BJ-v33n3-33824. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/33824.

Issue

Section

Biological Sciences