高等学校化学学报

高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (8): 793.

• 研究论文 •    下一篇

仲钨酸B的形成及其在钨钼分离中的应用

蒋安仁, 蒋伟中, 庞震   

  1. 复旦大学化学系
  • 收稿日期:1988-12-17 出版日期:1990-08-24 发布日期:1990-08-24
  • 通讯作者: 蒋安仁

The Formation of Paratungstate B and Its Use in the Separation of Tungsten and Molybdenum

Jiang Anren, Jiang Weizhong, Pang Zhen   

  1. Department of Chemistry, Fatal University, Shanghai
  • Received:1988-12-17 Online:1990-08-24 Published:1990-08-24

PDF (PC)

被引次数

8

摘要： 用SiO2作催化剂可大大加快仲钨酸A转变成仲钨酸B,反应后溶液的pH值从6.7升至8.1,在此pH条件下,MoO42-不聚合成Mo7O246-,利用这一差异,在含有杂质钼的仲钨酸B溶液中,加入胍盐后,钨以仲钨酸B胍盐[CN3H6]6W7O24·4H2O形式沉淀,钼以MoO42-留在溶液中,从而可分离钨和钼。

关键词: 仲钨酸A, 仲钨酸B, 胍, 钨钼分离

Abstract: It is a very slow transformation from paratungstate Ainto Paratungstate B, nevertheless, it can be completed within several hours under the catalysis of silica. When the reaction finished, the pHvalue of the solution rose up to 8.1 from its initial value 6.7. Under the final pHcondition, no polymerization of molybdenum occured. The difference between the abilities of forming polyanions of between tungsten and molybdenum can be used for their separation. Adding guanidine to the solution containing tungsten and molybdenum, tungsten precipitated in the form of guanidine paratungstate B, while molybdenum remained in the solution as normal molybdate.

Key words: Paratungstate A, Paratungstate B, Guanidine, Separation of W and Mo

TrendMD: