Thermodynamic analysis of separating lead and antimony in chloride system  

作　　者：陈进中 曹华珍 李波 袁海军 郑国渠 杨天足 

机构地区：[1]School of Metallurgical Science and Engineering, Central South University [2]School of Chemical Engineering and Materials, Zhejiang University of Technology

出　　处：《中国有色金属学会会刊：英文版》2009年第3期730-734,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(2006BAB02B04-4-1)supported by the National Key Technology R&D Program of China

摘　　要：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.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 [Pb^2＋][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 Pb^2＋ 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.

关 键 词：热力学分析 分离机制 氯化铅 氯化物 在系统 锑 浓度范围 PbCl2 

分 类 号：TF81[冶金工程—有色金属冶金]