Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 6    June 2016

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Leaching kinetics of zinc silicate in ammonium chloride solution
Sheng-hai YANG, Hao LI, Yan-wei SUN, Yong-ming CHEN, Chao-bo TANG, Jing HE

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract: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 °C), particle size of zinc silicate (61-150 μm) 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.

 

Key words: zinc silicate; ammonium chloride; leaching; kinetics; porous diffusion control

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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