Method for preparing battery grade vanadyl sulfate from ammonium vanadate compound

Abstract

The invention provides a method for preparing battery-grade vanadyl sulfate from an ammonium vanadate compound, which comprises the following steps: dissolving the ammonium vanadate compound in water to obtain an ammonium vanadate compound aqueous solution, and then sequentially carrying out iron removal and reduction on the ammonium vanadate compound aqueous solution to obtain a tetravalent vanadium solution, and extracting vanadium in the tetravalent vanadium solution by adopting a vanadium extraction agent formed by mutual synergism of an organic extraction agent, an organic stabilizer and a diluent in a specific volume ratio to obtain a vanadium-loaded organic phase, and finally, washing to remove impurities and reversely extracting to obtain the battery-grade vanadyl sulfate. The vanadium extraction agent comprises the following components in percentage by volume: 5-44% of an organic extraction agent, 1-5% of an organic stabilizer and 55-90% of a diluent. And the utilization rate of available functional groups is improved by utilizing the mutual synergistic effect of the organic extraction agent, the organic stabilizer and the diluent, so that the vanadium extraction capacity is improved, and the purity of the prepared battery-grade vanadyl sulfate is remarkably improved.