Potential Uses of Artisanal Gold Mine Tailings, with an Emphasis on the Role of Centrifugal Separation Technique
Potential Uses of Artisanal Gold Mine Tailings, with an Emphasis on the Role of Centrifugal Separation Technique
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DOI：
10.3390/su14138130
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发表时间：
2022-07
期刊：
影响因子：
3.9
通讯作者：
Jeanne Pauline Munganyinka;Jean Baptiste Habinshuti;J. Ndayishimiye;Levie Mweene;G. Ofori-Sarpong;B. Mishra;A. R. Adetunji;Himanshu Tanvar
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作者：
Jeanne Pauline Munganyinka;Jean Baptiste Habinshuti;J. Ndayishimiye;Levie Mweene;G. Ofori-Sarpong;B. Mishra;A. R. Adetunji;Himanshu Tanvar
尽管手工金矿开采活动会导致温室气体等环境问题，但很少有调查关注手工金矿尾矿的潜在用途。使用离心分离技术，对卢旺达 Miyove 金矿（巴拉德加和马索圭）手工金矿尾矿的矿物学特征进行了研究，以了解其作为有价值的黄金来源的潜在用途。 X 射线衍射分析、能量色散 X 射线光谱、电感耦合等离子体质谱、电感耦合等离子体发射光谱和 X 射线荧光的结果表明，手工金矿尾矿样品中含有大量黄金，证明经济的黄金提取机会是合理的。矿石和手工金矿尾矿中的金品位分别在 37-152 和 2-7 g t−1 范围内。石英是主要物相，两种不同类型的金矿石及其各自的尾矿中含有少量杂质。使用离心分离（被视为重力分离的延伸）进行的选矿显示，金矿石的金品位在 535–1515 g t−1 范围内，手工金矿尾矿的金品位在 36–302 g t−1 范围内。矿石和手工金矿尾矿的金回收率分别在 21.8-47.3% 和 46.9-63.8% 范围内。结果表明，与现场目前采用的淘选方法相比，离心分离技术在提高金回收率方面更有效，目前的淘选方法有时回收率低至 10%。结果表明，手工金矿尾矿的矿物学表征允许开发和设计合适的方法来改进金矿石选矿和手工金矿尾矿再加工。
Few investigations have focused on the potential uses of artisanal gold (Au) mine tailings, despite the fact that artisanal gold mining activity contributes to environmental issues such as greenhouse gas. Mineralogical characterizations of artisanal gold mine tailings in Miyove gold mine (Baradega and Masogwe) in Rwanda were investigated for potential utilization as a source of valuable gold, using the centrifugal separation technique. Results of X-ray diffraction analysis, energy dispersive X-ray spectroscopy, inductively coupled plasma mass spectrometry, inductively coupled plasma–optical emission spectroscopy, and X-ray fluorescence showed that artisanal gold mine tailings samples have significant amounts of gold to justify economical gold extraction opportunity. The gold grades in the ores and artisanal gold mine tailings were in the ranges of 37–152 and 2–7 g t−1, respectively. Quartz was a major phase, with minor impurities in two different types of gold ores and their respective tailings. The beneficiation carried out using centrifugal separation, regarded as an extension of gravity separation, showed gold grades in the range of 535–1515 g t−1 for gold ores and 36–302 g t−1 for artisanal gold mine tailings. The gold recoveries for ores and artisanal gold mine tailings were in the range of 21.8–47.3% and 46.9–63.8%, respectively. The results showed that the centrifugal separation technique was more efficient in boosting gold recovery compared to the present panning approach employed at the site, which sometimes recover as low as 10%. The results suggest that mineralogical characterization of artisanal gold mine tailings allows for the development and design of a suitable methods for improving gold ore beneficiation and artisanal gold mine tailings reprocessing.