Patent ID: 9428820
Filing Date: 2016-08-30
CPC Classification: C01G,C01P,C22B

Claim Text:
1. A method for producing cobalt sulfate from a chloride solution containing cobalt, the method comprising: Step 1: contacting an organic phase with an aqueous solution, the organic phase including an extracting solvent and an extractant at a proportion of 10% to 30% by volume, the aqueous solution is the chloride solution containing cobalt at a pH of 4.0 to 5.0, the aqueous solution further containing calcium, magnesium, and sodium, maintaining a liquid volume ratio (O/A Step 2: mixing the cobalt-retaining organic phase with a cleaning liquid in a liquid volume ratio of the cobalt-retaining organic phase to the cleaning liquid (O/A Step 3: adding a stripped starting liquid to the cobalt-retaining organic phase after cleaning, the stripped starting liquid includes sulfuric acid and has a pH of 0.5 to 1.0, maintaining a pH of a mixture of the stripped starting liquid and the cobalt-retaining organic phase after cleaning of 0.5 to 1.0 extracting cobalt from the cobalt-retaining organic phase after cleaning into the stripped starting liquid thereby forming a cobalt sulfate solution, wherein the ratio of the concentration of calcium, magnesium, and sodium to the concentration of cobalt in the cobalt sulfate solution are, respectfully, 0.0001, 0.0001, and 0.00005 or less.