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- W2337691232 abstract "We investigated the influence of dissolved calcium fluoride, CaF 2 (aq), on the electrochemical dissolution of pyrite and the corresponding environmental effects on acid mine drainage (AMD). The experimental results showed that CaF 2 (aq) promotes pyrite electrochemical dissolution. When the CaF 2 (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 Fe 2+ form FeF 2 , and at a higher scan potential, F − and Fe 3+ form the ion complex FeF 6 3− . 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 CaF 2 (aq) promoted the pyrite electrochemical dissolution. Core Ideas Results showed CaF 2 could effectively promote pyrite electrochemical dissolution. F – and Fe 2+ form FeF 2 , and at a higher scan potential, F – and Fe 3+ form the complex FeF 6 3– . Iron fluorine complex formation decreases charge transfer resistance at the double layer. Strong penetration of F – into the double layer decreases the resistance at the cover layer. AMD was significantly aggravated because CaF 2 promoted the pyrite dissolution." @default.
- W2337691232 created "2016-06-24" @default.
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- W2337691232 date "2016-07-01" @default.
- W2337691232 modified "2023-10-15" @default.
- W2337691232 title "Assessing the Influence of Calcium Fluoride on Pyrite Electrochemical Dissolution and Mine Drainage pH" @default.
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- W2337691232 doi "https://doi.org/10.2134/jeq2015.06.0275" @default.
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