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用有机酸活化剂提高铅-锌硫化矿中的金回收率

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用有机酸活化剂提高铅-锌硫化矿中的金回收率(中文4000字,英文2000字)
摘要
游离金和包裹在硫化物中的金被认为是金浮选的对象。然而，游离金的浮选在实践中表现出更多的变量。在这项研究中，研究提高金回收率的矿石来自中国云南的铅-硫化锌矿。结果表明，游离金和含金硫化物占总金的94.99%。不添加有机酸，可获得82%金的回收率。金/铅精矿中的金回收率在加入草酸盐和柠檬酸盐后分别增加了9.29%和7.35%，然而铅、砷的性能几乎保持不变。一个可能的原因是游离金用有机活化剂后对黄铁矿有很好的选择性。因此提出了一种提高金回收率的新方法。
关键词:金；提高回收率；铅-硫化锌矿；有机酸；选择性活化剂

Improving gold recovery of Pb–Zn sulfide ore by selective activation with organic acid
Abstract Free gold and gold wrapped in sulfides are considered as the object of gold floatation. However, floatation of free gold exhibits more variables in practice. In this study, improving gold recovery of a Pb–Zn sulfide ore from Yunnan Province, China, was investigated. The results show that free gold and auriferous sulfides account for 94.99 % of total gold. Without adding organic acid in floatation, only 82 % recovery of gold could be obtained. Gold recovery in Au/Pb concentrates increases by 9.29 % with oxalate added and by 7.35 % with citric acid added, respectively, while performances of lead and arsenic nearly keep a constant. A possible reason is that free gold is of wonderful selectivity against pyrite with organic activators. A new method to enhance gold recovery is proposed.
Keywords Gold: Improving recovery; Pb–Zn sulfide ore;Selective activation; Organic acid
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