Abstract
Silver ion can be useful in improving chalcopyrite bioleaching efficiency. In this work, leaching kinetics of this process was investigated using silver-bearing solid waste under different chalcopyrite/solid waste ratios. Bioleaching behavior indicates that silver-bearing solid waste can enhance the bioleaching process, and the redox potential is much higher than the proposed appropriate range (380-480 mV vs Ag/AgCl) with the solid waste added. There is a positive correlation between temperature and copper extraction rate. The kinetics data fit well with the shrinking-core model. Under these leaching conditions, the bioleaching of chalcopyrite is controlled by internal diffusion with calculated apparent activation energy (Ea) of 28.24 kJ/mol. This work is possible benificial to promote the industrial application of silver catalyst in leaching of chalcopyrite.
摘要
银能有效地催化黄铜矿浸出, 本文使用含银固体废弃物作为催化剂, 研究了不同黄铜矿/含银固体废弃物配比下的浸出动力学行为. 体系的生物浸出行为表明, 含银固体废弃物能有效催化浸出黄铜矿. 固体废弃物的加入使得体系的氧化还原电位远高于其他学者所提出的最适电位区间(380~480 mV vs Ag/AgCl), 体系浸出温度与铜浸出率呈**相关性. 在此浸出条件下, 黄铜矿的生物浸出主要由扩散控制, 表面活化能 Ea 为 28.24 kJ/mol. 本工作对推广微生物作用下银催化黄铜矿浸出的工业应用有参考价值.
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Foundation item: Project(2018JJ1041) supported by the Natural Science Foundation of Hunan, China; Projects(51774332, U1932129, 51804350 and 51934009) supported by the National Natural Science Foundation of China
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Liao, R., Wang, Xx., Yang, Bj. et al. Catalytic effect of silver-bearing solid waste on chalcopyrite bioleaching: A kinetic study. J. Cent. South Univ. 27, 1395–1403 (2020). https://doi.org/10.1007/s11771-020-4375-1
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DOI: https://doi.org/10.1007/s11771-020-4375-1