Study on Preparation of Sodium Metavanadate
-
摘要: 以多钒酸铵为原料,采用返溶除杂、溶液脱氨、溶析结晶的方法,制备了纯度大于99.5%的偏钒酸钠产品。通过研究表明:影响脱氨过程脱氨时间的主要因素为溶液终点p H值;最佳溶析结晶条件为[V]浓度150~200g/L,p H值为7.3~8.1,结晶剂与溶液体积比为1∶1,结晶时间为1 h,钒收率达到了97.7%。Abstract: Sodium metavanadate with more than 99.5% purity was prepared through dissolution for impurities and ammonia removal and dilution crystallization,with ammonium polyvanadate as raw material.The results show that the pH value at terminal point is the main influence factor for the time of ammonia removal in the solution. The optimum parameters for dilution crystallization are as follows: concentration of vanadium 150~200 g /L,pH 7.3~8.1,volume ratio of crystallization agent and solution 1:1,and crystallization period 1 h. The yield of vanadium can reach 97.7%.
-
Key words:
- sodium metavanadate /
- ammonium polyvanadate /
- removal of ammonia /
- vanadium yield
-

计量
- 文章访问数: 229
- HTML全文浏览量: 16
- PDF下载量: 9
- 被引次数: 0