(中南工业大学有色金属冶金系，长沙410083)
摘 要: 运用同时平衡原理和质量平衡原理对Bi3+-Cl--H2O体系进行了热力学分析和计算，在此基础上绘制了Bi3+-Cl--H2O体系在25 ℃下的各种沉淀物的平衡浓度对数-pH图，分析确定了各种固相沉淀物稳定存在的pH范围。结果表明，溶液中铋离子和硝酸根离子的浓度及溶液的pH值是影响各固相稳定存在的重要参数。由热力学图得出，可以直接从溶液中沉淀Bi2O3，要得到高纯度的BiOCl必须严格控制溶液的pH范围。
关键字: Bi3+-Cl--H2O体系；Bi2O3；BiOCl
（Department of Nonferrous Metallurgy, Central South University of Technology, Changsha 410083, P.R.China）
Abstract:The concentration balance principle and mass balance principle were applied to thermodynamical analysis and calculation of Bi3+-Cl--H2O system. The diagrams of the logarithm of equilibrium concentration of series precipitation vs pH of Bi3+-Cl--H2O system at 25℃ were drawn. The results show that c0(Bi), c0(Cl) and pH are the important factors to the stabilization zone of each solid. From thermodynamic diagrams it could be seen that Bi2O3 can be obtained from the solution directly, and if one want to get highly pure BiOCl, the pH range must be controlled strictly.
Key words: Bi3+-Cl--H2Osystem; Bi2O3; BiOCl
