Deselenization and detellurization of precious-metal ore concentrates by swelling oxidizing roasting and successive alkaline leaching
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第2期
论文作者：Fu-yuan Zhang Ya-jie Zheng Guo-min Peng
文章页码：147 - 155
摘 要：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 Na Cl 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°C using an Na Cl dosage coefficient of 100 and a sulfuric acid dosage coefficient of 1.3; the amorphous elemental tellurium is completely transformed into Te O2. The roasted product is subjected to alkaline leaching using a 100 g/L Na OH 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.
Fu-yuan Zhang1,2,3，Ya-jie Zheng1，Guo-min Peng2,3
1. School of Metallurgy and Environment,Central South University
摘 要：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 Na Cl 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°C using an Na Cl dosage coefficient of 100 and a sulfuric acid dosage coefficient of 1.3; the amorphous elemental tellurium is completely transformed into Te O2. The roasted product is subjected to alkaline leaching using a 100 g/L Na OH 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.
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