METHOD FOR PRODUCING HIGH-PURITY NICKEL SULFATE AND METHOD FOR REMOVING IMPURITY ELEMENT FROM SOLUTION CONTAINING NICKEL

摘要

Provided are: a method for removing an impurity element, wherein magnesium is selectively removed from a solution containing nickel; and a method for producing high-purity nickel sulfate using this method for removing an impurity element. A method for producing high-purity nickel sulfate, which is characterized in that, during the production procedure in the method for producing high-purity nickel sulfate from a solution containing nickel, the solution containing nickel in the production procedure is subjected to an impurity element removal process that is composed of: a hydroxylation step wherein a hydroxylated slurry is formed by adding an alkali of a hydroxide into the solution containing nickel in the production procedure; a carbonation step wherein the nickel component is recovered from the solution by forming a carbonated slurry by adding an alkali carbonate into the hydroxylated slurry; a solid-liquid separation step for the thus-obtained slurry; and a neutralization step wherein the post-reaction liquid obtained by solid-liquid separation is neutralized, thereby recovering the impurity element contained in the solution containing nickel in the production procedure.