Deselenization and detellurization of precious-metal ore concentrates by swelling oxidizing roasting and successive alkaline leaching

Fu-yuan Zhang; Ya-jie Zheng; Guo-min Peng

doi:10.1007/s12613-017-1389-2

Volume 24 Issue 2

Feb. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(2): 147-155

Fu-yuan Zhang, Ya-jie Zheng, and Guo-min Peng, Deselenization and detellurization of precious-metal ore concentrates by swelling oxidizing roasting and successive alkaline leaching, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 147-155. https://doi.org/10.1007/s12613-017-1389-2

Cite this article as:

Fu-yuan Zhang, Ya-jie Zheng, and Guo-min Peng, Deselenization and detellurization of precious-metal ore concentrates by swelling oxidizing roasting and successive alkaline leaching, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 147-155. https://doi.org/10.1007/s12613-017-1389-2

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Research Article

Deselenization and detellurization of precious-metal ore concentrates by swelling oxidizing roasting and successive alkaline leaching

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Corresponding author:
Ya-jie Zheng
Received: 18 July 2016; Revised: 11 September 2016; Accepted: 26 October 2016

Abstract

Abstract

A new technique of swelling oxidizing roasting and alkaline leaching was proposed for deselenization and detellurization of precious-metal ore concentrates. Alkali-metal and alkaline-earth-metal chlorides and carbonates were preliminarily selected as swelling agents. The roasting removal rate and alkaline leaching rate of selenium and tellurium were investigated, and NaCl was selected as an appropriate swelling agent. Furthermore, the effects of various factors on the selenium gasification rate and leaching rate of selenium and tellurium were investigated. The results show that the selenium gasification rate reaches 88.41% after swelling oxidizing roasting for 2 h at 510℃ using an NaCl dosage coefficient of 100 and a sulfuric acid dosage coefficient of 1.3; the amorphous elemental tellurium is completely transformed into TeO₂. The roasted product is subjected to alkaline leaching using a 100 g/L NaOH solution, which results in a selenium leaching rate of 10.51%, a total selenium removal rate of 98.92%, and a tellurium leaching rate of 97.64%. In the alkaline leaching residue, the contents of selenium, tellurium, gold, platinum, and palladium are 0.7825%, 5.492%, 8.333%, 0.2587%, and 1.113%, respectively; the precious metals are enriched approximately sixfold.
- ore treatment;
- precious metals;
- roasting;
- leaching;
- selenium removal;
- tellurium removal

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