Surface Chemistry and Flotation of Gold-Bearing Pyrite

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-09-06 DOI:10.3390/min14090914
Seda Özçelik, Zafir Ekmekçi
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Abstract

Gold grains are observed in a variety of forms, such as coarse-liberated native gold grains, and ultra-fine grains associated with sulfide or non-sulfide mineral particles, in the form of solid solution in sulfide minerals, mainly pyrite. In the flotation of gold ores, bulk sulfide mineral flotation is generally applied to maximize gold recovery. This approach gives high gold recoveries, but it also causes the recovery of barren sulfide minerals (i.e., sulfide mineral particles with no gold content), which increases concentrate tonnage and transportation costs and reduces the grade sometimes to below the saleable limit (approx. 10 g/t Au). This study addresses the differences between gold-bearing and barren pyrite particles taken from various ore deposits and utilizes these differences for the selective flotation of gold-bearing pyrite. The laboratory scale flotation tests conducted on three pyrite samples having different cyanide soluble gold contents show that a selective separation between gold-bearing pyrite and barren pyrite particles could be achieved under specific flotation conditions. Gold recovery is correlated directly with the cyanide-soluble gold in the ore samples. Electrochemical experiments were conducted to elucidate the differences in surface properties of the two types of pyrite. The barren pyrite particles were more cathodic and prone to cathodic reduction of OH− and depressant ions on the surface, and they could be depressed effectively without significantly affecting the gold-bearing particles.
含金黄铁矿的表面化学与浮选
金粒的形态多种多样,如粗粒原生金粒、与硫化物或非硫化物矿物颗粒伴生的超细金粒,以固溶体形式存在于硫化物矿物(主要是黄铁矿)中。在浮选金矿石时,通常采用块状硫化物矿物浮选法来最大限度地回收金。这种方法的金回收率高,但也会导致贫瘠硫化物矿物(即不含金的硫化物矿物颗粒)的回收,从而增加精矿的吨位和运输成本,并降低品位,有时甚至低于可销售的限度(约 10 克/吨金)。本研究探讨了取自不同矿床的含金黄铁矿颗粒和贫瘠黄铁矿颗粒之间的差异,并利用这些差异对含金黄铁矿进行选择性浮选。对氰溶金含量不同的三种黄铁矿样品进行的实验室规模浮选试验表明,在特定的浮选条件下,可以实现含金黄铁矿和贫瘠黄铁矿颗粒之间的选择性分离。金的回收率与矿样中的氰溶金直接相关。为阐明两种黄铁矿表面性质的差异,进行了电化学实验。贫瘠的黄铁矿颗粒阴极性更强,容易被表面的 OH- 和抑制剂离子阴极还原,它们可以被有效抑制,而不会对含金颗粒产生明显影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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