Methods for producing aqueous solutions containing nickel, cobalt, and manganese

Abstract

This study discusses the production method of aqueous solutions containing nickel, cobalt, and manganese, including: a leaching process consisting of a pressurized leaching process where raw materials are soaked under pressure to create an leaching solution containing nickel, cobalt, manganese, and impurities; and a process for removing impurities from the leaching solution. The process of precipitating the target substance involves precipitating a mixed hydroxide containing nickel, cobalt, and manganese by introducing a neutralizing agent into the filtrate from which the impurities are removed; and the dissolution process. The pressure extraction process consists of a first-stage pressure extraction process and a second-stage pressure extraction process, where the first-stage pressure extraction process involves an area of ​​higher acidity than the first-stage process. The impurity removal process includes a first-stage solvent extraction process that selectively extracts zinc from impurities and a second-stage solvent extraction process that extracts a further amount of zinc. Selective method of removing magnesium from impurities.