Method for producing nickel sulfate containing concentration control of oxidizing agent component by ORP measurement

摘要

Problem to be solved: to provide a method for suppressing adverse effects on the post process caused by the addition of an oxidant added for oxidative decomposition of thiosulfate.At least Ni as a metal ionAfter oxidizing the thiosulfuric acid contained in the aqueous solution of nickel sulfate containing CO and Fe in an oxidizing agentRemoval process for removing impurities andA method of producing nickel sulfate comprising a crystal process for crystallizing nickel sulfate crystal from aqueous solution of nickel sulfate after removal of impurities in the removal step;The ORP value of the aqueous solution of nickel sulfate after oxidation was measured.The processing conditions of the removal step are adjusted based on the concentration of the oxidizing agent obtained by the measurement result.Diagram