Methods for producing aquatic solutions containing nickel or cobalt

Abstract

This invention relates to a method for producing aqueous nickel or cobalt solutions consisting of: (A) a leaching step, which includes a first atmospheric pressure-heated leaching step and a second atmospheric pressure-heated leaching step, whereby the raw material is heated and leached under atmospheric pressure to produce a leaching solution containing nickel, cobalt, and impurities; (B) the first extraction step which separates the leaching solution into a first filtrate containing nickel and impurities and a first organic layer containing cobalt and impurities by adding the first solvent extractant to the leaching solution; (Ci) the precipitation removal step which precipitates and removes impurities including magnesium, calcium, or a mixture thereof by adding a precipitating agent to the first filtrate; and (Di) step of precipitating the target material which selectively precipitates nickel-containing nickel by adding a neutralizing agent to the secondary filtrate.