Biolixiviación en tanque de un concentrado de cobre utilizando los microorganismos moderadamente termofílicos Sulfobacillus thermosulfidoxidans KMM3 y Sulfobacillus acidophilus KMM26

Zahra Manafi; Mohammad Kargar; Farshid Kafilzadeh

doi:10.3989/revmetalm.207

Authors

Zahra Manafi Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom https://orcid.org/0000-0002-6217-0975
Mohammad Kargar Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom https://orcid.org/0000-0002-9531-3645
Farshid Kafilzadeh Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom https://orcid.org/0000-0003-2506-7140

DOI:

https://doi.org/10.3989/revmetalm.207

Keywords:

Bioleaching, Bioreactor, Copper concentrate, Moderate thermophiles

Abstract

Laboratory scale bioleaching of a copper concentrate was conducted using moderately thermophilic microorganisms to evaluate the technical capabilities as an alternative to the conventional smelting, and also to find the optimum conditions for copper extraction in terms of the pulp density, pH, and grain size of concentrate particles. For this purpose, a set of experiments was carried out in a 5-litre controllable bioreactor using two Sulfobacillus species. The results showed that more than 80% of Cu could be extracted from chalcopyrite concentrate within 12 days. The optimum conditions for Cu extraction were a pulp density of 5% (w/v), an initial pH 1 and a particle size (d80) of 45 µm. The results of this research will contribute to the design of an industrial tank bioleaching plant with an annual capacity of 50000 t cathodic copper by the Iranian Babak Copper Company (IBCCO).

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