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. 10    October 2016

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Theoretical simulation and experimental study of hydrolysis separation of SbCl3 in complexation-precipitation system
Qing-hua TIAN1,2, Yun-tao XIN1,2, Li YANG1, Xue-hai WANG1, Xue-yi GUO1,2

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China,
Central South University, Changsha 410083, China

Abstract:The theoretical simulation and verified experiments on metal separation in a Sb3+-OH--Cl- complexation-precipitation system involving hydrolysis-precipitation reactions of SbOCl, Sb4O5Cl2 and Sb2O3 were carried out. The equilibrium concentration of [Sb3+]T was obtained by calculation and verified by experiments. The precipitates SbOCl, Sb4O5Cl2 and Sb2O3 were analyzed through the equilibrium concentration of Sb3+ in the solution and the ΔrGΘm of transformation reactions of these materials. It is found that the concentration of [Sb3+]T in verified experiments was larger than the theoretical value, where the theoretical minimum concentration of [Sb3+]T was 10-10.92 mol/L at pH value of 4.6 and the minimum concentration obtained from the verified experiment was about 10-3.8 mol/L at pH value of 5.1. Different precipitates can be obtained at certain pH. The SbOCl cannot be obtained both in theoretic calculations and in verified experiments, while the Sb8O11Cl2?H2O was generated in the experiment.

 

Key words: antimony chloride; complexation-precipitation; thermodynamics equilibrium; verification

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

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

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