Process mineralogy characteristics of acid leaching residue produced in low-temperature roasting-acid leaching pretreatment process of refractory gold concentrates

Shuang-hua Zhang; Ya-jie Zheng; Pan Cao; Chao-hui Li; Shen-zhi Lai; Xing-jun Wang

doi:10.1007/s12613-018-1664-x

Volume 25 Issue 10

Oct. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(10): 1132-1139

Shuang-hua Zhang, Ya-jie Zheng, Pan Cao, Chao-hui Li, Shen-zhi Lai, and Xing-jun Wang, Process mineralogy characteristics of acid leaching residue produced in low-temperature roasting-acid leaching pretreatment process of refractory gold concentrates, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1132-1139. https://doi.org/10.1007/s12613-018-1664-x

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Shuang-hua Zhang, Ya-jie Zheng, Pan Cao, Chao-hui Li, Shen-zhi Lai, and Xing-jun Wang, Process mineralogy characteristics of acid leaching residue produced in low-temperature roasting-acid leaching pretreatment process of refractory gold concentrates, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1132-1139. https://doi.org/10.1007/s12613-018-1664-x

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Research Article

Process mineralogy characteristics of acid leaching residue produced in low-temperature roasting-acid leaching pretreatment process of refractory gold concentrates

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Corresponding author:
Ya-jie Zheng E-mail: zyj@csu.edu.cn
Received: 12 January 2018; Revised: 8 June 2018; Accepted: 11 June 2018

Abstract

Abstract

To provide a theoretical basis for a suitable process to extract gold from refractory gold concentrates, process mineralogy on the acid leaching residue of gold calcine was studied by chemical composition, X-ray diffraction, scanning electron microscopy-energy spectrum, and mineral dissociation analysis. The results showed that the acid leaching residue contained Au 68.22 g/t, Ag 92.71 g/t, Fe 0.44%, As 0.10%, and S 0.55%. Gold and silver minerals existed as native gold, argentite, and proustite. Quartz, the main gangue mineral, accounted for 78.33wt/%. The dissociation degree analysis showed that the proportions of monomer and exposed gold in acid leaching residue were 96.66wt%. The cyanidation results showed that the cyanide gold leaching rate of acid leaching residues was close to 100wt%. However, the maximum cyanide gold leaching rate of gold calcine was only 85.31wt%. This suggests that acid leaching can increase the gold dissolution rate in the cyanide process.
- acid leaching residue;
- roasting;
- process mineralogy;
- precious metals;
- occurrence states

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