热分解法从钨钼过氧酸溶液中分离钨和钼

摘要

A separation method for W and Mo from peroxoacids solution by thermal decomposition wasstudied. Thermal decomposition of peroxotungstic acid and peroxomolybdic acid was investigated respectively. The results confirmed that peroxomolybdic acid showed a preferable stability compared with peroxotungstic acid. This thermal stability difference was the basic principle of theseparationof W and Mo. Experiments were performed to study the effects of temperature, stirring speed, free acid concentration and Mo concentration on the separation efficiency. The results indicated that peroxotungstic acid decomposed into tungstic acid(H2WO4) and precipitated selectively,while Mo was rejected in aqueous solution,realizing good separation of W and Mo. The separation factorof W and Moreached 112 under the studied conditions, which indicated that this method has potential for use in separating W and Mo.%研究了一种从含钨钼过氧酸溶液中分离钨和钼的方法。对过氧钨酸和过氧钼酸的热分解过程分别进行研究，证实了过氧钼酸比过氧钨酸具有更高的稳定性，并利用这一差异来分离钨和钼。研究反应温度、搅拌速度、游离酸浓度和溶液钼浓度对钨、钼分离效果的影响。结果表明：在钨、钼过氧酸溶液的热分解过程中，过氧钨酸分解为钨酸沉淀，而钼仍存在于溶液中，从而实现钨和钼的分离。在所研究的实验条件下，钨和钼的分离系数可达到112，该结果表明热分解法在钨、钼分离过程中具有良好的应用前景。