Preparation of Ammonium Polyvanadate Using High Concentration of Vanadium Solution Containing Sodium

In order to resolve the technological problems of precipitation of ammonium polyvanadate （APV） by ammonium salts under acid conditions using high concentration of sodium-containing vanadium solution,the dripping method was adopted to prepare APV under acid conditions with the high concentration of sodium-containing vanadium solution as raw material. The results show that through the dripping method the precipitation rate of vanadium is more than 99% with 50.51% of vanadium,0.089% of Na₂O and 0.074% of sulphur （S） in the obtained APV,under the conditions of 2.30 for reaction pH,90 ℃ of reaction temperature,ammonium addition coefficient K = 1.0 and 10% of addition amount for A seed crystals. After calcination,the quality of obtained vanadium pentoxide （V₂O₅） satisfies the requirements of YB/T5304—2011 standard. This new method can realize the production capacity enhancement and decrease the energy consumption,wastewater treatment burden and production cost significantly.