Method for deeply purifying and removing trace nickel and copper in cobalt electrolyte

The invention relates to the technical field of cobalt electrolyte purification, in particular to a method for deeply purifying and removing trace nickel and copper in cobalt electrolyte, which comprises the following specific implementation steps: step 1, preparing metal cobalt by adopting insoluble anolyte with the electrolyte concentration of about 200g/L and the electrolyte pH value of 1-2; 2, the electrolyte is exchanged with resin in an ion exchange column at a certain flow rate, a countercurrent purification process is adopted in the purification process, the nickel content in the purified electrolyte is reduced to 0.00008 g/L, the copper content is 0.00001 g/L, the cobalt-nickel ratio is 1570250 times, and the cobalt-copper ratio is 12562000 times; 3, the purified cobalt electrolyte is electrolyzed, and 6N cobalt with the nickel content smaller than 0.2 ppm, the copper content smaller than 0.1 ppm and the total impurity content smaller than 1 ppm is obtained after electrolysis; according to the soluti