简介概要

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



详情信息展示

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

Received 13 October 2008; accepted 18 February 2009

                                                                                                  

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

                                                                                                           


1 Introduction

It is difficult to separate lead and antimony from jamesonite by mineral process because they exist as sulfide solid solutions and disseminate each other[1]. In order to utilize comprehensively the jamesonite, it must be treated by metallurgy method. The pyrometallurgy process to separate the lead and antimony is described as follows. Firstly, the lead and antimony alloy is produced by fluidized roasting desulfurization, calcine sintering mixture and reduction smelting in blast furnace; then, the antimony oxide powder and crude lead are produced by converting the lead and antimony alloy in reverberatory furnace; finally, lead and antimony are separated. But there are some problems in the pyrometallurgy process, such as lots of recycle materials, long process, difficulty in separating lead and antimony, low recovery of lead and antimony[2].

It is easy to separate lead and antimony by using the solubility of PbCl2 while the jamesonite is treated by leaching in chloride system. TANG and WANG[3] used SbCl5 as oxidant to separate the lead and antimony by chloridization-leaching the jamesonite. The mass ratio of lead to antimony is 3×10-5. WANG et al[4] used the slurry electrolysis process to treat complex antimony lead concentrate, and proposed that antimony can be separated from lead in one step, and metallic antimony can be achieved in cathode directly at the same time. The recovery of antimony is above 98%. The lead in residue of slurry electrolysis process is transformed into carbonate from chloride with ammonium carbonate. The total recoveries of lead and silver are over 95% and 80%, respectively.

In various media, such as NaCl, HCl and CaCl2, the solubility of PbCl2 as a function of temperature has been studied[5-7]. In chloride system[8-9], the thermo- dynamic analysis of the PbCl2 solubility has been initially studied. But the thermodynamic analysis of PbCl2 solubility in antimony trichloride solution has not been reported yet.

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