Thermodynamic analysis of separating lead and antimony in chloride system

来源期刊：中国有色金属学报(英文版)2009年第3期

论文作者：陈进中 曹华珍 李波 袁海军 ZHENG Guo-qu 杨天足

文章页码：730 - 734

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

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.

基金信息：the National Key Technology R＆D Program of China