METHOD FOR PRODUCING COBALT SULFATE

摘要

Provided is a method for producing cobalt sulfate, wherein, on the occasion of separating an acidic solution containing calcium, magnesium and sodium as impurities from a cobalt chloride solution by solvent extraction, when a diluent is added to the extractant to be used to dilute the extractant by 10% to 30% by volume; in Step 1, the operational pH is maintained in the range of 4.0 to 5.0 and the liquid volume ratio of organic phase/liquid phase is maintained in the range of 5.0 to 7.0; in Step 2, the operational pH is maintained in the range of 4.0 to 4.5 and the liquid volume ratio of organic phase/liquid phase is maintained in the range of 5.0 to 10.0; and in Step 3, the pH is maintained in the range of 0.5 to 1.0.

主权项

1. 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.