高等学校化学学报

高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (1): 41.

• 论文 • 上一篇    下一篇

钼(Ⅵ)和钨(Ⅵ)的阴离子交换性能研究——草酸-盐酸体系

蔡淑莲1, 周执明2   

  1. 1. 复旦大学化学系;
    2. 浙江化工学院化工系
  • 收稿日期:1980-10-23 出版日期:1982-01-25 发布日期:1982-01-25

INVESTIGATION OF ANION-EXCHANGE BEHAVIOUR FOR MOLYBDENUM(Ⅵ) AND TUNGSTEN(Ⅵ) IN OXALIC ACID-HYDROCHLORIC ACID SY STEM

Cai Shulian1, Zhou Zhiming2   

  1. 1. Fudan University;
    2. Zhejiang Chemical Engineering Institute, Shanghai
  • Received:1980-10-23 Online:1982-01-25 Published:1982-01-25

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摘要： 本文在草酸-盐酸体系中,研究钼、钨等元素在强碱性阴离子交换树脂ZerolitFF上的阴离子交换行为,并确定其分离的最佳条件。用高仅2厘米,直径0.9厘米的交换柱可分离大量钨等元素中的微量钼;其分离比率高达1×104:1。应用于试剂级钨酸钠中钼的分离,结果满意。此外,还确定在该体系中,钼与树脂相进行交换的主要形式为MoO2(C2O4)22-。

Abstract: The anion-exchange behaviour of molybdenum (VI), tungsten(VI) and other metal ions on a strong basic anion-exchange resin (Zerolit FF) has been investigated in oxalic acid-hydrochloric :acid system. There are marked differences in adsorptivity for molybdenum(VI) and other metals. The optimum condition for separation is to keep the solution at 0.05Moxalic acid-1.0Mhydrochloric acid. Using a strong basic anion exchange column in the chloride form, tungsten(VI) and other metal ions pass through while molybdenum(VI) is quantitatively retained as oxalate complex.Then molyb-denum(VI) is eluted with 1.0.Mhydrochloric acid. Acolumn 2cm long diameter 0.9 cm is satisfactory for the separation of microgram quantity of molybdenum (VI) from sodium tungstate(reagent grade). The system offers a good method for preparation of tungsten without molybdenum.From the slope of the plot of distribution coefficient against concentration of chloride ion in the system, it has been shown that for molybdenum only one kind of complex ion, MoO3 (C2O4)22-, is predominant and governs the exchange mechanism.

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