高浓度钠化钒液制备多钒酸铵的研究

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

为解决高浓度钠化钒液采用酸性铵盐工艺沉淀多钒酸铵困难的问题,以高浓度钠化钒液为研究对象,采用滴加法沉钒工艺进行酸性铵盐沉钒。试验结果表明:采用滴加沉钒工艺,控制反应p H为2.30、反应温度T为90℃、加铵系数K为1.0、A晶种加入量为10%时,沉钒率达到99%以上,多钒酸铵中TV含量为50.51%,Na2O为0.089%,S为0.074%,煅烧后,五氧化二钒产品质量符合YB/T5304—2011要求。此沉钒新方法可实现产能提高、能耗降低、废水处理量减少与生产成本大幅降低等效益。

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 Na_2O 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( V_2O_5) 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.