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Title of Journal: Int J Miner Metall Mater

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Abbravation: International Journal of Minerals, Metallurgy, and Materials

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University of Science and Technology Beijing

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DOI

10.1016/0921-5093(88)90058-5

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ISSN

1869-103X

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Deselenization and detellurization of preciousmet

Authors: Fuyuan Zhang Yajie Zheng Guomin Peng
Publish Date: 2017/02/18
Volume: 24, Issue: 2, Pages: 147-155
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Abstract

A new technique of swelling oxidizing roasting and alkaline leaching was proposed for deselenization and detellurization of preciousmetal ore concentrates Alkalimetal and alkalineearthmetal 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 8841 after swelling oxidizing roasting for 2 h at 510°C using an NaCl dosage coefficient of 100 and a sulfuric acid dosage coefficient of 13 the amorphous elemental tellurium is completely transformed into TiO2 The roasted product is subjected to alkaline leaching using a 100 g/L NaOH solution which results in a selenium leaching rate of 1051 a total selenium removal rate of 9892 and a tellurium leaching rate of 9764 In the alkaline leaching residue the contents of selenium tellurium gold platinum and palladium are 07825 5492 8333 02587 and 1113 respectively the precious metals are enriched approximately sixfold

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