高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (6): 732.

• 论文 • 上一篇    下一篇

酸性溶液中SO2选择性还原分解钨过氧配合物——钨中微量钼的除去

王志宏, 蒋安仁, 顾春林   

  1. 复旦大学化学系, 上海, 200433
  • 收稿日期:1991-06-15 出版日期:1992-06-24 发布日期:1992-06-24
  • 通讯作者: 蒋安仁

Selective Reduction Decomposition of Peroxotungstate by SO2 in Acidic Solution——Removing Trace Molybdenum from Tungsten

WANG Zhi-hong, JIANG An-ren, GU Chun-lin   

  1. Department of Chemistry, Fudan University, Shanghai, 200433
  • Received:1991-06-15 Online:1992-06-24 Published:1992-06-24

摘要: 用SO2还原4:2钨过氧配合物[H4W4O12(O2)2]已被作为在室温和低酸度条件下生产钨酸的一种新方法——络合均相沉淀法[1,2].有意义的是,这一方法还能用SO2对钨、钼过氧配合物的选择性分解,同时除去钨中的微量钼.本文研究了不同游离酸度和不同反应温度条件下选择性分解时的除钼效果,并初步给予理论上的解释.

关键词: 4, 2钨过氧配合物, SO2选择性还原, 钨钼分离

Abstract: Complex-Homogeneous Precipitation Method was developed for precipitation of tungstic acid at room temperature and low acidity.This method can also be used to remove trace molybdenum from tungsten by selective reduction decomposition when SO2 is introduced to the mixed solution.The linear relationship between peroxotungstate and peroxomolybdate concentration in solution was established, i e. ln=[W]=kln[Mo]+A which A=ln[W]0 - kln[Mo]0.The separation constant k becomes large when temperature and acidic strength rise and their relationship is k rises slightly with the increase of [H+]2(from [H+]=0.5 to 4.0 mol/L) and exp (-1/T) (T=273 +t , 20≤t≤50℃).The kinetics mechanism was also discussed.

Key words: 4:2 Peroxotungstate, Selective reduction decomposition by SO2, Removing molybdenum from tungsten

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