The invention belongs to the field of
vanadium batteries, and particularly discloses a
vanadium battery key material as well as a preparation method and a preparation
system thereof. The method comprises the following steps: adding
ammonium salt and acid into an alkaline
vanadium-containing leaching solution, and carrying out weak acid
ammonium salt vanadium
precipitation reaction under the conditions that the pH is 4-6 and the temperature is 20-85 DEG C to obtain a
sodium ammonium decavanadate
solid; the method comprises the following steps: mixing a
sodium ammonium decavanadate
solid with a solution containing ammonium ions, and carrying out
solid-phase
crystal transformation ammonium
sodium replacement reaction at the temperature of 90-100 DEG C to obtain high-purity ammonium
vanadate; directly calcining the high-purity ammonium
vanadate or calcining the high-purity ammonium
vanadate after re-
dissolution recrystallization to obtain high-purity vanadium
pentoxide; the high-purity vanadium
pentoxide is used for preparing a vanadium battery key material. According to the scheme, the alkaline vanadium-containing
leachate serves as the
raw material, deep removal of impurities is achieved through weak acid ammonium salt vanadium
precipitation and solid-phase
crystal transformation ammonium sodium replacement, high-purity ammonium vanadate is prepared, high-purity vanadium
pentoxide is further prepared, and the high-performance vanadium battery key material is prepared with the high-purity vanadium pentoxide serving as the
raw material.