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

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Transactions of Nonferrous Metals Society of China

Vol. 19    No. 3    June 2009

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Thermodynamic analysis of separating lead and antimony in chloride system
CHEN Jin-zhong(陈进中)1, CAO Hua-zhen(曹华珍)2, LI Bo(李 波)2,
YUAN Hai-jun(袁海军)2, ZHENG Guo-qu(郑国渠)2, YANG Tian-zu(杨天足)1

1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Chemical Engineering and Materials, Zhejiang University of Technology,
Hangzhou 310014, China

Abstract:In chloride system, thermodynamic analysis is a useful guide to separate lead and antimony as well as to understand the separation mechanism. An efficient and feasible way for separating lead and antimony was discussed. The relationships of [Pb2+][Cl]2—lg[Cl]T and E—lg[Cl]T in Pb-Sb-Cl-H2O system were studied, and the solubilities of lead chloride at different antimony concentrations were calculated based on principle of simultaneous equilibrium. The results show that insoluble salt PbCl2 will only exist stably in a certain concentration range of chlorine ion. This concentration range of chlorine ion expands a little with increasing the concentration of antimony in the system while narrows as the system acidity increases. The solubility of Pb2+ in solution decreases with increasing the concentration of antimony in the system, whereas increases with increasing the concentration of total chlorine. The concentration range of total chlorine causing lead solubility less than 0.005 mol/L increases monotonically.


Key words: lead; antimony; separation; chloride system; thermodynamic analysis

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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