有色设备

In this paper, the technological conditions of copper removal by sulfidization from nickel electrolyte are experimented and studied. The results show that the pH value of solution reaction, the oxidation reduction potential (ORP) value at reaction end point and the stages of sulfidization reaction are the key factors affecting the separation of copper and nickel in nickel electrolyte with hydrogen sulfide. The ORP value among them determines the copper removal efficiency and nickel loss in copper precipitate the reaction solution at low or high PH value is not favorable for copper removal; the Cu/Ni ratio of the precipitate obtained from two-stage sulfidization is better than that of single-stage. Under the controlled conditions of reaction temperature 60~70℃, the actual dosage of H₂S 1.2~1.5 times of the theoretical demand, the product solution ORP at the reaction end points of the first and second stage sulfidization reaction 110~180mV and -(115~120)mV respectively, the concentration of Cu ion in the solution after sulfidization can drop to less than 1mg/L, and the Cu/Ni ratio in the sulfidization precipitate is maintained above 15, proving the feasibility of the technology.