硅酸锌在氯化铵溶液中的浸出动力学

研究硅酸锌在氯化铵溶液中的浸出动力学,讨论搅拌速度（150-400 r/min）、浸出温度（95-108°C）、硅酸锌粒度（61-150μm）以及氯化铵浓度（3.5-5.5 mol/L）对锌浸出率的影响。结果表明,减小硅酸锌粒度、提高浸出温度和氯化铵浓度可以显著地提高锌的浸出率。在多孔颗粒的动力学模型中,颗粒模型的孔隙扩散控制能很好地描述锌的浸出动力学。浸出反应的表观活化能为161.26 k J/mol,氯化铵的反应级数为3.5....

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Published in中国有色金属学报：英文版 Vol. 26; no. 6; pp. 1688 - 1695
Main Author 杨声海 李浩 孙彦伟 陈永明 唐朝波 何静
Format Journal Article
LanguageEnglish
Published 2016
Subjects
动力学
孔隙扩散控制
氯化铵
浸出
硅酸锌
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Summary:研究硅酸锌在氯化铵溶液中的浸出动力学,讨论搅拌速度（150-400 r/min）、浸出温度（95-108°C）、硅酸锌粒度（61-150μm）以及氯化铵浓度（3.5-5.5 mol/L）对锌浸出率的影响。结果表明,减小硅酸锌粒度、提高浸出温度和氯化铵浓度可以显著地提高锌的浸出率。在多孔颗粒的动力学模型中,颗粒模型的孔隙扩散控制能很好地描述锌的浸出动力学。浸出反应的表观活化能为161.26 k J/mol,氯化铵的反应级数为3.5.
Bibliography: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）
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 ℃, 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.
43-1239/TG
zinc silicate; ammonium chloride; leaching; kinetics; porous diffusion control
ISSN:1003-6326