Ammonium vanadate prepd. by controlled pptn. - has low alkali content and gives higher yield when reduced to vanadium

摘要

of low alkali content is prepd. by precipitating solns. of sodium vanadate and sulphate with ammonium sulphate at pH 7.5 to 9 and at 25-35 degrees C, pref. with vigorous stirring. Higher purity of prod. reduces losses in aluminothermic redn. of V2O5 to vanadium, caused by Na2O, which consumes more Al and is reduced to sodium, which causes the dust produced in the process to contain appreciable amts. of vanadium. Yield in the pptn. is raised from 83% to 97%.