电氧化与黄铁矿溶解在尾矿原位可持续处理中的应用

W. J. Ju, E. H. Jho, K. Nam
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引用次数: 1

摘要

采矿活动中产生的尾矿往往含有高浓度的重金属,特别是含黄铁矿的尾矿是矿区环境问题的主要原因。化学电池技术或燃料电池技术可用于浸出含黄铁矿尾矿中的重金属。当黄铁矿通过自发氧化(即电氧化)在电池的阳极室中溶解时,生成铁和硫酸。由于硫酸的产生,pH值降低,重金属可以从含黄铁矿的尾矿中浸出。本研究将黄铁矿在23℃的酸性溶液(pH 2)和电偶反应器中溶解4周,诱导电氧化,比较电偶氧化是否能促进黄铁矿氧化,并比较从黄铁矿中浸出的总铁和pH。利用扫描电子显微镜(SEM)分析了黄铁矿表面的变化。对比从黄铁矿中浸出的总铁,在电反应釜中黄铁矿的溶出量是在酸性溶液中黄铁矿溶出量的2.9倍,因此电反应釜中的pH值低于酸性溶液。通过对在电反应釜中反应的黄铁矿进行SEM分析,观察到黄铁矿表面出现线状裂纹。研究结果表明,电氧化有利于黄铁矿在电反应器中的溶解,表明电氧化可作为含黄铁矿尾矿修复的一种选择。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of Galvanic Oxidation and Pyrite Dissolution for Sustainable In-Situ Mine Tailings Treatment
Mine tailings generated during mining activity often contain high concentrations of heavy metals, with pyrite-containing mine tailings in particular being a major cause of environmental problems in mining areas. Chemical cell technology, or fuel cell technology, can be applied to leach heavy metals in pyrite-containing mine tailings. As pyrite dissolves through spontaneous oxidation (i.e. galvanic oxidation) in the anode compartment of the cell, Fe, sulfuric acid are generated. A decrease in pH due to the generation of sulfuric acid allows heavy metals to be leached from pyrite-containing mine tailings. In this study, pyrite was dissolved for 4 weeks at 23°C in an acidic solution (pH 2) and in a galvanic reactor, which induces galvanic oxidation, and total Fe leached from pyrite and pH were compared in order to investigate if galvanic oxidation can facilitate pyrite oxidation. The change in the pyrite surface was analyzed using a scanning electron microscope (SEM). Comparing the total Fe leached from the pyrite, there were 2.9 times more dissolution of pyrite in the galvanic reactor than in the acidic solution, and thus pH was lower in the galvanic reactor than in the acidic solution. Through SEM analysis of the pyrite that reacted in the galvanic reactor, linear-shaped cracks were observed on the surface of the pyrite. The study results show that pyrite dissolution was facilitated through the galvanic oxidation in the galvanic reactor, and also implied that the galvanic oxidation can be one remediation option for pyrite-containing mine tailings.
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