个体和小型金矿尾矿的特征描述和再处理

IF 1.5 4区 工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING
Abdou Azizi Youpoungam, Sadiye Kantarcı, İbrahim Alp
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引用次数: 0

摘要

世界多个地区的手工和小规模金矿开采产生了数百万吨固体废物。这项研究的重点是位于苏丹东北部的阿布-哈马德手工金矿的尾矿。分析结果显示,这些汞合金废料平均含金 5.5 克/吨、汞 50 克/吨、银 3.3 克/吨、铜 191 克/吨。粒度分布在 - 10 微米到 + 300 微米之间,平均粒度约为 65 微米。金属分布显示,金和汞的品位在细粒度部分有所增加。X 射线衍射分析表明,石英是这些残留物的主要矿物相。SEM-EDS 显示了金、汞和其他附属矿物(如硫化物和氧化物矿物)的存在。显微分析表明,这些尾矿中的大部分金颗粒都是游离的,只有少数金颗粒被石英包裹。重力测试表明,金的最佳回收率为 47.18%。台式搅拌氰化浸出试验表明,在 24 小时内,金、汞、铜和银的回收率分别为 90%、71%、32% 和 22%。这些废料中汞的含量很高,会造成各种环境和公共健康问题,因此应开发新的环保型处理技术,从这些尾矿中回收金和银。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Characterization and Reprocessing of Artisanal and Small-Scale Gold Mine Tailings

Characterization and Reprocessing of Artisanal and Small-Scale Gold Mine Tailings

Millions of tons of solid waste are generated by artisanal and small-scale gold mining in several regions of the world. This study focused on the tailings from the Abu Hamad artisanal gold mine located in northeastern Sudan. The results of the analyses carried out showed that this amalgam waste contained on average 5.5 g/ton of gold, 50 g/ton of mercury, 3.3 g/ton of silver, and 191 g/ton of copper. The particle size distribution was between − 10 and + 300 µm, and the average grain size was about 65 µm. Metal distributions showed that gold and mercury grades increased in fine-grained size fractions. X-ray diffraction analyses showed that quartz is the main constituent mineral phase of these residues. The presence of gold, mercury, and other accessory minerals such as sulfide and oxide minerals was revealed by the SEM–EDS. Microscopic analysis showed that majority of gold particles in these tailings are free while few others were occluded in quartz. The gravity tests carried out showed that the best gold recovery result was 47.18%. Bench scale stirred cyanide leaching tests showed that gold, mercury, copper, and silver can be recovered at 90%, 71%, 32%, and 22%, respectively, in 24 h. These high gold recoveries show that these tailings offer a possible commercial secondary resource for gold mining. These wastes contain high mercury grades, which can cause various environmental and public health problems, that is why new environmentally friendly treatment techniques should be developed to recover gold and mercury from these tailings.

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来源期刊
Mining, Metallurgy & Exploration
Mining, Metallurgy & Exploration Materials Science-Materials Chemistry
CiteScore
3.50
自引率
10.50%
发文量
177
期刊介绍: The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.
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