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Intensified bioleaching of low-grade molybdenite concentrate by ferrous sulfate and pyrite

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Abstract

Intensifying effects of ferrous sulfate and pyrite on bioleaching of low-grade molybdenite concentrate were studied in this paper. The experimental results show that the oxidation dissolution of molybdenite can be accelerated with the addition of either ferrous sulfate or pyrite in bioleaching medium. Pyrite has better enhancing effect than ferrous sulfate, and the highest molybdenum leaching rate in pyrite-added solutions is 20.85 %, increasing by 12.64 % compared with that in 9 K leaching system. Molybdenum leaching rate does not increase linearly with the increase of the addition of either ferrous sulfate or pyrite in each type solution. Great amounts of [NH4Fe3(SO4)2(OH)6] and [KFe3(SO4)2(OH)6] with different morphologies will be deposited on molybdenite ores when the additions of Fe from ferrous sulfate or pyrite exceed that from 9 K leaching system by 0.5 times, and these deposits hinder the oxidation dissolution of molybdenite to some extent.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (Nos. 51304151 and 51174062), and the High-Tech Research and Development Program of China (No. 2012AA061501).

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Authors and Affiliations

  1. School of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Juan Yu & Jun Zhu

  2. School of Materials & Metallurgy, Northeastern University, Shenyang, 110004, China

    Hong-Ying Yang & Lin-Lin Tong

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  1. Juan Yu
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  2. Hong-Ying Yang
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  4. Jun Zhu
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Correspondence to Juan Yu.

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Yu, J., Yang, HY., Tong, LL. et al. Intensified bioleaching of low-grade molybdenite concentrate by ferrous sulfate and pyrite. Rare Met. 34, 207–214 (2015). https://doi.org/10.1007/s12598-014-0437-6

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  • DOI: https://doi.org/10.1007/s12598-014-0437-6

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