Dissolution characteristics of sericite in chalcopyrite bioleaching and its effect on copper extraction

Ying-bo Dong; Hao Li; Hai Lin; Yuan Zhang

doi:10.1007/s12613-017-1416-3

Volume 24 Issue 4

Apr. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(4): 369-376

Ying-bo Dong, Hao Li, Hai Lin, and Yuan Zhang, Dissolution characteristics of sericite in chalcopyrite bioleaching and its effect on copper extraction, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 369-376. https://doi.org/10.1007/s12613-017-1416-3

Cite this article as:

Ying-bo Dong, Hao Li, Hai Lin, and Yuan Zhang, Dissolution characteristics of sericite in chalcopyrite bioleaching and its effect on copper extraction, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 369-376. https://doi.org/10.1007/s12613-017-1416-3

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Research Article

Dissolution characteristics of sericite in chalcopyrite bioleaching and its effect on copper extraction

+ Author Affiliations

Corresponding author:
Hai Lin E-mail: linhai@ces.ustb.edu.cn
Received: 29 June 2016; Revised: 25 July 2016; Accepted: 29 August 2016

Abstract

Abstract

The effects of sericite particle size, rotation speed, and leaching temperature on sericite dissolution and copper extraction in a chalcopyrite bioleaching system were examined. Finer particles, appropriate temperature and rotation speed for Acidithiobacillus ferrooxidans resulted in a higher Al³⁺ dissolution concentration. The Al³⁺ dissolution concentration reached its highest concentration of 38.66 mg/L after 48-d leaching when the sericite particle size, temperature, and rotation speed were -43 μm, 30℃, and 160 r/min, respectively. Meanwhile, the sericite particle size, rotation speed, and temperature can affect copper extraction. The copper extraction rate is higher when the sericite particle size is finer. An appropriately high temperature is favorable for copper leaching. The dissolution of sericite fitted the shrinking core model, 1-(2/3)α-(1-α)^2/3=k₁t, which indicates that internal diffusion is the decision step controlling the overall reaction rate in the leaching process. Scanning electron microscopy analysis showed small precipitates covered on the surface of sericite after leaching, which increased the diffusion resistance of the leaching solution and dissolved ions.
- sericite;
- bioleaching;
- copper extraction;
- dissolution kinetic;
- shrinking core model

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References

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