Method for producing cobalt sulfate

A method for producing cobalt sulfate from a chloride solution containing cobalt,

• the method comprising producing cobalt sulfate by subjecting the chloride solution containing cobalt to a solvent extraction process composed of the following Step 1 to Step 3:
• Step 1:
• bringing an extracting solvent which contains an extractant at a proportion of 10% to 30% by volume, into contact with the chloride solution containing cobalt at a pH of 4.0 to 5.0 to extract cobalt from the chloride solution containing cobalt, and thereby forming a cobalt-retaining organic phase;
• Step 2:
• mixing the cobalt-retaining organic phase obtained in the Step 1 with a cleaning liquid containing cobalt to cause impurities included in the cobalt-retaining organic phase to transfer into the cleaning liquid containing cobalt, and thereby forming a cobalt-retaining organic phase after cleaning;
• and
• Step 3:
• adding dilute sulfuric acid as a stripped starting liquid to the cobalt-retaining organic phase after cleaning in the Step 2 so as to obtain a pH of 0.5 to 1.0, thereby bringing the cobalt-retaining organic phase after cleaning into contact with the dilute sulfuric acid, and thus forming a cobalt sulfate solution.