Study on Intensification Behavior of Bismuth Ions on Gold Cyanide Leaching
AbstractGold cyanide leaching is inefficient with conventional cyanidation. Bismuth ions can improve the efficiency of gold cyanidation by intensifying gold dissolution. The electrochemical behavior, structure information, and surface product of gold anodic dissolution were studied during the intensification of bismuth ions on gold cyanide leaching. The electrochemical analysis showed that the bismuth ions can not only improve anode current density, but also make gold dissolve at a lower potential, increase the corrosion current and intensify gold anodic dissolution. The microstructure analysis showed that bismuth ions intensified the cyanide corrosion of the gold surface, causing a large number of loose honeycombs, gullies, pits, and large holes on the gold surface. The XPS, FT-IR, and Raman analysis showed that there is weak information of C≡N in the spectrum of Bi intensification contrasting to that of conventional cyanidation. Cyanide compounds may be the insoluble AuCNads, which does not deposit on the surface of gold plate after Bi intensification cyanidation. The insoluble intermediate AuCNads is likely to react promptly with CN- to form soluble Au(CN
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Yang, Y.; Lai, M.; Zhong, Q.; Li, Q.; Xu, B.; Jiang, T. Study on Intensification Behavior of Bismuth Ions on Gold Cyanide Leaching. Metals 2019, 9, 362.
Yang Y, Lai M, Zhong Q, Li Q, Xu B, Jiang T. Study on Intensification Behavior of Bismuth Ions on Gold Cyanide Leaching. Metals. 2019; 9(3):362.Chicago/Turabian Style
Yang, Yongbin; Lai, Meixiang; Zhong, Qiang; Li, Qian; Xu, Bin; Jiang, Tao. 2019. "Study on Intensification Behavior of Bismuth Ions on Gold Cyanide Leaching." Metals 9, no. 3: 362.
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