Preparation of Ammonium Polyvanadate Using High Concentration of Vanadium Solution Containing Sodium
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摘要: 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pH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。Abstract: 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.
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