Study of galvanic interactions between pyrite and chalcopyrite in a flowing system: implications for the environment |
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Authors: | Liu Qing You Li Heping Zhou Li |
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Institution: | (1) Laboratory for Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Graduate School, Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | When galvanic interactions between pyrite and chalcopyrite occur in solution, pyrite, with the higher rest potential, acts
as a cathode and is protected whereas chalcopyrite, with the lower rest potential, acts as an anode and its oxidation is increased.
In this work a three-electrode system was used to investigate the corrosion current density and mixed potential of a galvanic
cell comprising a pyrite cathode and a chalcopyrite anode in a flowing system. The results showed that with increasing concentration
of ferric ion in the solution, with increasing acidity, and with increasing flow rate of the solution, the corrosion current
density increased and the mixed potential of the galvanic cell became more positive. These experimental results are of direct
significance to the control of environmental pollution in mining activity. By using the galvanic model, mixed potential theory,
and the Butler–Volmer equation, the experimental results were explained theoretically. |
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Keywords: | Pyrite Chalcopyrite Galvanic interaction Flowing system Environmental pollution |
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