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Study on Pre-oxidation of a High-Arsenic and High-Sulfur Refractory Gold Concentrate with Potassium Permanganate and Hydrogen Peroxide

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Abstract

For arsenic-containing refractory gold concentrate, gold recovery by leaching is extremely difficult due to the encapsulation of gold in arsenopyrite and pyrite. In this work, the pre-oxidation of a high-arsenic and high-sulfur refractory gold concentrate in the acidic potassium permanganate or hydrogen peroxide solutions has been investigated. The studied parameters include pre-oxidation time, acidity, pre-oxidation temperature, ethylene glycol addition and oxidant concentration. When potassium permanganate of 0.25 mol/L is used as oxidant, 61.4% of arsenic and 51.8% of iron can be removed, respectively. The results of kinetics analysis indicate that the oxidative dissolution of arsenopyrite during the pre-oxidation process is controlled by the product layer diffusion, with an activation energy of 7.92 kJ/mol. The stability of hydrogen peroxide can be significantly improved by increasing both sulfuric acid concentration and ethylene glycol addition when hydrogen peroxide is used as oxidant. Under optimum conditions, arsenic removal ratio of 57.2% and iron removal ratio of 51.9% have been achieved with hydrogen peroxide of 2.5 mol/L, sulfuric acid of 0.75 mol/L and ethylene glycol of 30 mL/L. The gold extraction of refractory concentrate is only 11.5% in the copper–ammonia–thiosulfate leaching solutions without pre-oxidation. A gold extraction of 71.8% and significant decrease in thiosulfate consumption from 28.2 to 5.7% have been observed for the concentrate after pre-oxidation.

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Acknowledgements

The authors would like to acknowledge the financial support of the National Natural Science Fund of China (Grant Nos. 51434001 and 51574072), and the Opening Fund of State Key Laboratory of Pressure Leaching, Kunming (No. yy2016005).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110004, China

    Jian Wang, Wei Wang, Yunlong Bai, Yan Fu & Feng Xie

  2. State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resource, Kunming, 650031, China

    Gang Xie

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  1. Jian Wang
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  2. Wei Wang
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  3. Yunlong Bai
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  4. Yan Fu
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Correspondence to Wei Wang or Feng Xie.

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Wang, J., Wang, W., Bai, Y. et al. Study on Pre-oxidation of a High-Arsenic and High-Sulfur Refractory Gold Concentrate with Potassium Permanganate and Hydrogen Peroxide. Trans Indian Inst Met 73, 577–586 (2020). https://doi.org/10.1007/s12666-020-01863-6

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