酸性矿山排水过程中形成的氧化铁沉淀中的金、银和铁

IF 1.1 Q3 MINING & MINERAL PROCESSING
J. Jurković, E. Babajić, T. M. –. Šarac, M. Kolar, A. Kazlagić
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引用次数: 4

摘要

含硫化物矿石的氧化是酸性矿山排水的主要原因,酸性矿山排水是一个与废弃矿山和活动矿山有关的环境问题。含铁硫化物矿物可被氧化,形成硫酸盐含量高、pH值低、电导率高、氧化还原电位高、铁、铝和其他重金属浓度高的矿井水。在AMD的过程中,可能会发生具有大活性表面的结晶较差的铁的氧氢氧化物的沉淀。在氢氧化铁表面,沉淀的颗粒物、阴离子和阳离子(金属)可以被吸附。矿井水中可能含有一定量的贵金属,这些贵金属也可以吸附在铁颗粒物表面,这项研究工作对此进行了调查。在这项工作中,使用了巴科维奇(波斯尼亚和黑塞哥维那中部)废弃金矿废料中的氧化铁颗粒物样本。在选定的矿山废物样品上测量了几个参数,包括pH、水含量、粒度分布、硫酸盐含量、电导率、氧化还原电位以及金、银和铁的含量。所获得的结果表明,在铁沉淀物中存在显著量的金(平均:6.8mg/kg)和银(平均:7.13mg/kg)。贵金属在氢氧化铁表面的吸附强烈依赖于pH。在非常低的pH值下,贵金属的解吸是最受欢迎的。因此,贵金属仅部分地吸附在氢氧化铁表面上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gold, Silver and Iron in Iron Oxy-hydroxide Precipitate Formed in Process of Acid Mine Drainage
Oxidation of sulfide-containing ores is the main cause of Acid Mine Drainage (AMD), which is an environmental problem associated with both the abandoned and active mines. Iron-bearing sulfide minerals can be oxidized and form mine waters with high sulfate content, low pH, high electrical conductivity, high redox potential, and high concentrations of iron, aluminum, and other heavy metals. In the process of AMD, precipitation of poorly crystalized oxy-hydroxides of iron with a large active surface can occur. On the surface of iron oxy-hydroxide, the precipitated particulate matter, anions, and cations (metals) could be adsorbed. Mine waters can contain a certain amount of precious metals that can also be adsorbed onto an iron particulate matter surface, which is investigated in this research work. In this work, the samples of iron oxy-hydroxide particulate matter at abandoned gold mine waste in Bakovici (Central Bosnia and Herzegovina) are used. Several parameters including pH, water content, particle size distribution, sulfate content, electrical conductivity, redox potential, and amounts of gold, silver, and iron are measured on the selected mine waste samples. The results obtained indicate that significant amounts of gold (average: 6.8 mg/kg) and silver (average: 7.13 mg/kg) are present in the iron precipitate. Adsorption of precious metals onto the iron oxy-hydroxide surface is strongly pH-dependent. At a very low pH value, desorption of precious metals is favorite. Thus, precious metals are only partially adsorbed onto the iron oxy-hydroxide surface.
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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