Abstract: To increase the difference of electrochemical character of tungsten and molybdenum and separate them, molybdophosphate heteropoly acid and tungstophosphoric heteropoly acid solutions were prepared. Electrochemical behaviors of tungsten, molybdenum, molybdophosphate heteropoly acid and tungstophosphoric heteropoly acid in the acidic solution were studied, and some cyclic voltammetry diagrams were obtained. The results showed that the reduction potential of tungsten ion was higher than that of molybdenum ion, and the difference was less than 0.1 V, which means that tungsten could not be separated from molybdenum at this potential difference. Once tungsten and molybdenum reacted with phosphoric acid, the potential values of reduction peaks of molybdophosphate heteropoly acid and tungstophosphoric heteropoly acid were 0.401 and 0.1949 V, respectively, indicating that phosphoric acid increased the potential difference between tungsten and molybdenum.

Key words: tungsten, molybdenum, electrochemistry, reduction, separation, cyclic voltammetry

摘要： 为加大钨钼电化学性质的差异实现钨钼分离，使钨钼形成钨磷、钼磷杂多酸，采用循环伏安法研究酸性条件下含钨钼溶液及钨磷、钼磷杂多酸的电化学行为，获得多种溶液体系的循环伏安曲线. 结果表明，研究体系中钨的还原电位较钼高，但二者电位差小于0.1 V，无法利用电化学性质差异高效分离；而将钨和钼形成杂多酸体系后，钼磷杂多酸还原峰电位为0.401 V，钨磷杂多酸为0.1949 V，加入磷酸增大了钨钼离子电位差，可优先将钼还原.

关键词: 钨, 钼, 电化学, 还原, 分离, 循环伏安法