Studies on Refining Cobalt Salt Solution by Extraction Chromatography to Prepare High Purity Cobalt

Abstract

The key to preparing high-purity cobalt is purifying of cobalt solution. Cobalt sulfate solution was refined by PC88A levextrel Resins which produced from HPD-100 type of ethylene benzene -divinylbenzene porous adsorption resin and PC88A extractant. The results indicate that under the condition which the solvent impregnated resins containing PC88A is 55% in 065 mm × 700mm chromatography column, extraction pH value is 3.7, buffer elution pH value is 2.9, velocity of flow is 1~1.5 chromatography column volume/h, when solution volume is three times of column volume, stripping solution is collected and stripping by pH 1.0 hydrochloric acid. The high purity cobalt chloride solution is obtained. Removing organic impurity form cobalt chloride solution and concentrating, the high purity cobalt which obtained by electrolyze the cobalt chloride solution is tested by GDMS. The results indicate that the total impurity of twenty elements is less than 10 ppm.