Method for supplementing nickel and removing copper in nickel electrolysis production system

The invention discloses a method for supplementing nickel and removing copper in a nickel electrolysis production system, which comprises the following steps of: preparing waste liquid with high copper content and high acid content in the system and nickel anolyte, controlling certain Cu < 2 + > and H < + > ion concentration, and pumping into an electrolytic bath which takes nickel sulfide as an anode and a titanium plate as a cathode for reaction; in the electrolysis process, Cu < 2 + > and H < + > ions on the cathode obtain electrons to separate out sponge copper or hydrogen, and nickel in the anode loses electrons and enters the electrolyte in the form of Ni < 2 + >. According to the method, a high-copper solution, a high-acid solution and a low-nickel solution are prepared according to the requirements of copper, nickel and acid in the electrolysis process, the prepared solution is treated through an electrolysis process, and then the low-copper solution, the low-acid solution and the high-nickel solution