Dissolution characteristics of sericite in chalcopyrite bioleaching and its effect on copper extraction
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第4期
论文作者：Ying-bo Dong Hao Li Hai Lin Yuan Zhang
文章页码：369 - 376
摘 要：The effects of sericite particle size,rotation speed,and leaching temperature on sericite dissolution and copper extraction in a chalcopyrite bioleaching system were examined. Finer particles,appropriate temperature and rotation speed for Acidithiobacillus ferrooxidans resulted in a higher Al3+ dissolution concentration. The Al3+ dissolution concentration reached its highest concentration of 38.66 mg/L after 48-d leaching when the sericite particle size,temperature,and rotation speed were-43 μm,30°C,and 160 r/min,respectively. Meanwhile,the sericite particle size,rotation speed,and temperature can affect copper extraction. The copper extraction rate is higher when the sericite particle size is finer. An appropriately high temperature is favorable for copper leaching. The dissolution of sericite fitted the shrinking core model,1 –（2/3）a –（1 – a）2/3 = k1 t,which indicates that internal diffusion is the decision step controlling the overall reaction rate in the leaching process. Scanning electron microscopy analysis showed small precipitates covered on the surface of sericite after leaching,which increased the diffusion resistance of the leaching solution and dissolved ions.
Ying-bo Dong，Hao Li，Hai Lin，Yuan Zhang
School of Energy and Environmental Engineering,University of Science and Technology Beijing
摘 要：The effects of sericite particle size,rotation speed,and leaching temperature on sericite dissolution and copper extraction in a chalcopyrite bioleaching system were examined. Finer particles,appropriate temperature and rotation speed for Acidithiobacillus ferrooxidans resulted in a higher Al3+ dissolution concentration. The Al3+ dissolution concentration reached its highest concentration of 38.66 mg/L after 48-d leaching when the sericite particle size,temperature,and rotation speed were-43 μm,30°C,and 160 r/min,respectively. Meanwhile,the sericite particle size,rotation speed,and temperature can affect copper extraction. The copper extraction rate is higher when the sericite particle size is finer. An appropriately high temperature is favorable for copper leaching. The dissolution of sericite fitted the shrinking core model,1 –（2/3）a –（1 – a）2/3 = k1 t,which indicates that internal diffusion is the decision step controlling the overall reaction rate in the leaching process. Scanning electron microscopy analysis showed small precipitates covered on the surface of sericite after leaching,which increased the diffusion resistance of the leaching solution and dissolved ions.
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