Method for preparing low-nickel-iron-chromium electrolyte through impurity removal of sulfide

The invention relates to the technical field of electrolyte production, in particular to a method for preparing a low-nickel-iron-chromium electrolyte through impurity removal of sulfide. The method comprises the following steps: S1, pumping a ferrochrome solution into a reaction kettle, replacing air in the kettle with nitrogen, and adjusting the pH value of the solution with alkali; s2, adding sulfide, starting a self-circulating pump, and heating for reaction; s3, pumping the hydrogen sulfide gas in the kettle into another reaction kettle, stopping the circulating pump, starting stirring, cooling and aging, and carrying out solid-liquid separation to obtain a first ferrochromium solution and sulfide slag; s4, hydrochloric acid is added into the first ferrochrome solution, evaporation concentration, cooling crystallization and solid-liquid separation are conducted, and sodium chloride and a second ferrochrome solution are obtained; and S5, the second ferrochromium solution and hydrochloric acid are compound