中文摘要：

研究不同配合-沉淀体系中铁与钴、镍的分离性能。通过热力学理论计算预测碳酸体系、氨水体系和碳酸-氨水体系中溶液金属离子浓度与pH值之间的关系，结合实验确定碳氨体系具有最佳的除铁效果，能保证较小的钴、镍损失，且有利于后续钴、镍的分离。通过条件实验确定碳氨体系最佳除铁工艺条件如下：（CoNi）/Fe3＋浓度比为1.5~2.5，氨水浓度为1 mol/L，Na 2 CO 3浓度为0.01 mol/L，pH值为4.0。在（CoNi）/Fe3＋浓度比为2.5，其他条件为最佳条件时，除铁率＞99%，钴的损失率为11.4%，镍的损失率为10.6%。该方法除铁效果明显、过滤性能良好，具有较好的应用前景。

英文摘要：

The separation properties of ion to cobalt and nickel in complexation-precipitation system were studied. The relationship between metal ion concentration and pH value in the complexation-precipitation systems of carbonate system, ammonia system and carbonate-ammonia system was simulated by the thermodynamic calculation. Combined with the experiments, the carbonate-ammonia system was considered as the best ion-removal system, which can guarantee a high iron removal efficiency, small amount of cobalt, nickel lost, and is conducive to the subsequent separation of cobalt and nickel. The results show that the optimal ion-removal conditions in carbonate-ammonia system are determined as follows：（CoNi）/Fe3＋concentration ratio of 1.5-2.5;ammonia concentration of 1 mol/L;Na 2 CO 3 concentration of 0.01 mol/L;pH value of 4.0. Under this condition of （CoNi）/Fe3＋=2.5, the ion-removal rate is over 99%, the cobalt loss rate is about 11.4%, and the nickel loss rate is 10.6%. This ion-removal method has the advantages of high iron removal efficiency, favorable filtration performance and good application prospect.