Leaching kinetics of zinc silicate in ammonium chloride solution

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...

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Published inTransactions of Nonferrous Metals Society of China Vol. 26; no. 6; pp. 1688 - 1695
Main Authors YANG, Sheng-hai, LI, Hao, SUN, Yan-wei, CHEN, Yong-ming, TANG, Chao-bo, HE, Jing
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2016
Subjects
ammonium chloride
Ammonium chlorides
Diffusion
kinetics
Leaching
Mathematical models
Particle size
porous diffusion control
Reaction kinetics
Zinc
zinc silicate
Zinc silicates
zinc silicate
porous diffusion control
leaching
ammonium chloride
kinetics
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Summary: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.
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ISSN:1003-6326
DOI:10.1016/S1003-6326(16)64278-4