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Assessing the Influence of Calcium Fluoride on Pyrite Electrochemical Dissolution and Mine Drainage pH
Luying Wang; Qingyou Liu; Kai Zheng; Heping Li
2016
Source PublicationJournal of Environmental Quality
Volume45Issue:4Pages:1344-1350
Abstract

We investigated the influence of dissolved calcium fluoride, CaF2(aq), on the electrochemical dissolution of pyrite and the corresponding environmental effects on acid mine drainage (AMD). The experimental results showed that CaF2(aq) promotes pyrite electrochemical dissolution. When the CaF2(aq) concentration increased from 0 to 10 mg L-1 up to saturation, the promoting efficiency was 15.80 and 57.25%, respectively. The reason for this phenomenon is that F- and Fe2+ form FeF2, and at a higher scan potential, F- and Fe3+ form the ion complex FeF63- The mechanisms include: (i) the decreasing charge transfer resistance at the double layer due to the iron fluorine complex formation; and (ii) the decreasing passivation resistance at the cover layer due to the strong penetration of F-ions through it into the double layer. Although the hydrolysis reaction of F-in solution could increase the pH value of mine drainage, the AMD was significantly aggravated because CaF2(aq) promoted the pyrite electrochemical dissolution.

Subject Area地球深部物质与流体作用地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6506
Collection地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文
Recommended Citation
GB/T 7714
Luying Wang,Qingyou Liu,Kai Zheng,et al. Assessing the Influence of Calcium Fluoride on Pyrite Electrochemical Dissolution and Mine Drainage pH[J]. Journal of Environmental Quality,2016,45(4):1344-1350.
APA Luying Wang,Qingyou Liu,Kai Zheng,&Heping Li.(2016).Assessing the Influence of Calcium Fluoride on Pyrite Electrochemical Dissolution and Mine Drainage pH.Journal of Environmental Quality,45(4),1344-1350.
MLA Luying Wang,et al."Assessing the Influence of Calcium Fluoride on Pyrite Electrochemical Dissolution and Mine Drainage pH".Journal of Environmental Quality 45.4(2016):1344-1350.
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