The invention relates to the field of purification of trace
impurity elements in electrodeposited
nickel catholyte in the non-
ferrous metal smelting industry, in particular to a method for purifying As and Se impurities in a
nickel sulfate solution for producing high-quality electrodeposited
nickel, which comprises the following steps: preparing a
reducing agent into a solution with a certain concentration; the prepared
reducing agent solution is metered and added into the nickel
sulfate solution, so that the
reducing agent fully reacts with As and Se substances in different forms, and the As and Se substances are separated out in a
precipitation form; and carrying out
solid-liquid separation on the reacted nickel
sulfate solution to obtain a deeply purified nickel sulfate solution, and carrying out electrodeposition by using the solution to obtain high-quality electrodeposited nickel. According to the method, one or more of NaBH4, KBH4, N2H4.H2O, Na2S2O3, Na2S,
hydroxylamine hydrochloride,
oxalic acid, Na2S2O3 and Na2S are adopted as reducing agents for
impurity removal, Se and As impurities can be effectively removed, and the content of As and Se in the solution is smaller than 0.00001 g / L. The
impurity removal process is short in flow and high in impurity removal efficiency, and deep purification of the electrodeposited nickel
cathode nickel sulfate solution can be achieved.