Trivalent and tetravalent mixed vanadium compound producing...

Details Trivalent and tetravalent mixed vanadium compound producing... Trivalent and tetravalent mixed vanadium compound producing...

C - Chemistry, Metallurgy

01

G

C01G 31/00 (2006.01) H01M 10/36 (2006.01)

Patent

CA 2352038

The present invention provides method of producing a trivalent and tetravalent mixed vanadium compound having excellent solubility with sulfuric acid directly from a tetravalent or pentavalent vanadium compound by using a reducing agent, and a method of producing a vanadium electrolyte. For example, a vanadium compound mainly containing a pentavalent vanadium compound; sulfur and concentrated sulfuric acid in molar ratios with respect to (one mol of vanadium atom in the pentavalent vanadium compound) 0:35 to 0.4 : 1.2 to 1.9 are kneaded into paste form, and the paste-form mixture is calcined at a temperature of not less than 150°C to less than 440°C so that a trivalent and tetravalent mixed vanadium compound is obtained, and a redox flow battery-use vanadium electrolyte is obtained by dissolving the trivalent and tetravalent mixed vanadium compound in a sulfuric acid solution.

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