中文摘要：

根据质量守恒和同时平衡原理,以Me（Co、Ni、Fe、Mn）为金属元素,建立Me-OH-、Me-OH--CO32-、Me-OH--S2-、Me-OH--NH3和Me-OH--NH3-CO32-等多个配合-沉淀体系的热力学平衡模型。结果表明：Fe3＋可以在Me-OH-、Me-OH--NH3体系中通过调节pH=3预先沉淀分离,而Co、Ni、Mn仅在Me-OH--NH3-CO32-体系中有分离效果。Me-OH--NH3-CO32-体系热力学计算表明：Co、Ni、Mn在溶液中的行为受pH值、配合剂、沉淀剂浓度共同影响,碳酸根初始总浓度[C]增大和氨初始总浓度[N]减小有利于Co、Ni、Mn形成沉淀。当[C]=1 mol/L、[N]=2 mol/L、pH值为9～10时,大部分Ni以高级氨配离子[Ni（NH3）4^2＋]、[Ni（NH3）5^2＋]、[Ni（NH3）6^2＋]的形式保留在溶液中,而Co、Mn以MnCO3、CoCO3的形式沉淀出来。Co可在Me-OH--S2-体系中通过调节pH〈6从溶液中与Mn分离。研究结果可为钴镍二次资源综合回收钴镍、制备钴镍产品提供理论指导。

英文摘要：

Based on mass balance principle and simultaneous equilibrium principle, the metal element Me （Co, Ni, Fe, Mn）, complexing agent of OH^- and NH3, and precipitant of OH-, S^2- and CO3^2- were chosen to form the eomplexation-precipitation systems of Me-OH-, Me-OH--CO32-, Me-OtV-S^2-, Me-OH--NH3 and Me-OH--NH3-CO3^2-. The thermodynamic equilibriums of these systems were studied. The results show that Fe3＋ in systems of Me-OH- and Me-OH--NH3 can be separated by precipitation through adjusting the pH value to 3. However, Co, Ni and Mn can be separated only in Me-OH--NH3-CO3^2- system. The theoretical calculations show that the behavior of Co, Ni and Mn in Me-OH--NH3-CO3^2- system is affected by pH value, complexing agent concentration and precipitant concentration. The increase of the total concentration of carbonate [C] is in favor of the precipitation of Ni, Co and Mn, but the increase of the total ammonia concentration IN] has the opposite effect. When [C]=I mol/L, IN]=2 mol/L and pH value of 9-10, most Ni is complexed in the solution in the form of senior ammonia complexes [Ni（NH3）4^2＋] and [Ni（NH3）5^2＋], [Ni（NH3）6^2＋], while Co and Mn precipitate in MnCO3 and COCO3. Finally, Co can be separated with Mn from the solution in Me-OH--S^2- system when pH〈6. The results provide a theoretical guidance for cobalt and nickel recovery from secondary resources and the preparation of cobalt and nickel products