METHOD FOR RECOVERY PURIFICATION OF NICKEL IONS FROM RESIDUAL SOLUTIONS

摘要

The invention relates to a process for the recovery purification of nickel ions from residual solutions. According to the invention, the process consists, in a first stage, in extracting the nickel ion as nickel oxalate dihydrate, under the following optimal reaction conditions: the molar nickel concentration within the residual solution0.02, the solution pH=4.5, excess oxalic acid of 100%, the reaction temperature of 80A C; further on, the nickel oxide is obtained by thermal decomposition of the resulting nickel oxalate, at a temperature of 320...360A C.