| Black nickel is a trivalent nickel hytroxide Ni(OH)_3 with strongoxidization,It is used for removal of not only cobalt,but also other impu-rities,such as Cu,Fe,Mn,As and so on,from nickel solution,So it is a good method that black nickel is used as a neutral agent in the precipita- tion separation of nickel from cobalt.In this paper,the parameters,such as dosage of trivalent nickel, temperature,pH,cobalt concentration,is empha- tically described.The pilot tests and industrial tests of Fukang Ni Smelter,Xinjiang showed that it is feasible for the application of Co removal techno- logy by using Ni(OH)_3 in sulphate system.The solution after Co removal,is as a cathode solution in Ni electrowinning with insoluble anode. The elec-trolytic nickel produced well meets the standards of No. 1 electrolytic nickel. |