Leaching kinetics of zinc silicate in ammonium chloride solution

被引：40
|
作者：
Yang, Sheng-hai [1 ]
Li, Hao [1 ]
Sun, Yan-wei [1 ]
Chen, Yong-ming [1 ]
Tang, Chao-bo [1 ]
He, Jing [1 ]
机构：
[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2016年 / 26卷 / 06期
基金：
中国国家自然科学基金;
关键词：
zinc silicate; ammonium chloride; leaching; kinetics; porous diffusion control; HYDROMETALLURGICAL TREATMENT; DISSOLUTION KINETICS; HEMIMORPHITE; TAILINGS; ORE;
D O I：
10.1016/S1003-6326(16)64278-4
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The leaching kinetics of zinc silicate in ammonium chloride solution was investigated. The effects of stirring speed (150-400 r/min), leaching temperature (95-108 degrees C), particle size of zinc silicate (61-150 mu m) and the concentration of ammonium chloride (3.5-5.5 mol/L) on leaching rate of zinc were studied. The results show that decreasing the particle size of zinc silicate and increasing the leaching temperature and concentration of ammonium chloride can obviously enhance the leaching rate of zinc. Among the kinetic models of the porous solids tested, the grain model with porous diffusion control can well describe the zinc leaching kinetics. The apparent activation energy of the leaching reaction is 161.26 kJ/mol and the reaction order with respect to ammonium chloride is 3.5.
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页码：1688 / 1695
页数：8
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