To provide an economical and continuous production method of tervalent, quadrivalent and tervalent/quadrivalent mixture vanadium electrolytic solns.
Ammonium trivanadate is crystallized from a sulfuric acid soln. of ammonium methavanadate containing impurities, and the obtd. slurry is concentrated, subjected to centrifugal separation 10 and dried 11 to collect ammonium trivanadate. The collected material is heated in an oxidative atmosphere in a sealed rotary kiln 15 to remove ammonia to produce vanadium pentoxide, while ammonium trivanadate is reduced in the presence of hydrogen to produce vanadium trioxide. By dissolving the obtd. vanadium trioxide and vanadium pentoxide (or, only vanadium trioxide) in sulfuric acid and water and by controlling the mixing proportions of vanadium trioxide and vanadium pentoxide, tervalent, quadrivalent and tervalent/quadrivalent mixture vanadium electrolytic solns. can be produced.
NAKAJIMA MASATO
NOMURA YUTAKA
FURUSATO KOICHI
SATO KANJI
