Dissolution of pyrite and other Fe-S-As minerals using deep eutectic solvents
Dissolution of pyrite and other Fe-S-As minerals using deep eutectic solvents
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DOI：
10.1039/c7gc00334j
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发表时间：
2017-05-07
期刊：
影响因子：
9.8
通讯作者：
Wieland, Matthias
中科院分区：
文献类型：
--
作者：
Abbott, Andrew P.;Al-Bassam, Ahmed Z. M.;Wieland, Matthias
加工含硫矿物是急性人为污染的最大来源之一，特别是以酸性矿山废水的形式。这项研究试图展示一种处理硫化物矿物的创新方法。结果表明，黄铁矿在深度共熔溶剂(DES，氯化胆碱和乙二醇的混合物)中可被电化学氧化和还原增溶。提出了一种新的方法来研究矿物的氧化还原性质，用矿物粉末制成的糊状物在DES中。首次发现黄铁矿在没有生成H_2S或SO_2的情况下发生了整体电化学溶解。研究还表明，包括砷等元素在内的可溶形态可以通过电化学方法回收，这可能会减少酸性矿山废水的排放。文中还介绍了其他铁硫矿物和铁砷矿物的电化学性质，并与黄铁矿进行了比较。
Processing sulfur containing minerals is one of the biggest sources of acute anthropogenic pollution particularly in the form of acid mine drainage. This study attempts to show an innovative method for processing sulfide-based minerals. It is shown that pyrite can be solubilised by both electrochemical oxidation and reduction in a deep eutectic solvent (DES) Ethaline, a mixture of choline chloride and ethylene glycol. A novel method is demonstrated to investigate the redox properties of minerals using a paste made from the mineral powder in a DES. The first bulk electrochemical dissolution of pyrite is shown without the formation of H2S or SO2. It is also shown that the soluble species, including elements such as arsenic, can be recovered electrochemically which could potentially decrease acid mine drainage. The electrochemical properties of other iron-sulfur and iron-arsenic minerals are also presented and compared to those of pyrite.