Enargite concentrate processing by the combination of mechanochemical, hydrometallurgical and precipitation methods

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• 作者：Zdenka Buj艌á ; ková ; ; ^{bujnakova@saske.sk" class="auth_mail} ; Peter Balá ; 啪¹ ; Anna Zorkovská ; ¹
• 关键词：Enargite concentrate ; Mechanochemistry ; Arsenic ; Leaching ; Hydrometallurgy
• 刊名：International Journal of Mineral Processing
• 出版年：10 March, 2014
• 年：2014
• 卷：127
• 期：Complete
• 页码：28-36
• 全文大小：1049 K

文摘

This paper investigates the possibility of enargite concentrate treatment using an environmentally friendly route. Enargite Cu₃AsS₄ contains dangerous arsenic, and this element can be removed by leaching with Na₂S in very alkaline environment (pH > 12.5). Arsenic passes into the leach, while the copper sulfide produced represents a raw material suitable for pyrometallurgy. We have shown that more than 80% of the arsenic can be extracted by atmospheric alkaline leaching at 95 掳C, when mechanical pretreatment of enargite concentrate in an attritor is applied. The solubilized arsenic can be transformed into solid Na₃AsS₄. The solid product Cu₂S can be further treated with elemental iron by mechanochemical reduction in a planetary mill. The final product forms a Cu/FeS composite from which iron can be separated by leaching with HCl. The proposed two-step process of milling (enhancement of arsenic removal (I) and obtaining of elemental copper (II)) illustrates the principal possibility of transforming minerals into metals.