钨钼的硫化反应热力学分析

钨钼分离是钨提取冶金中的重要工序。目前,工业上应用的分离方法大都是基于钨和钼对硫的亲和力的差异,在一定条件下使MoO42-硫化为MoS42-从而除去钼,因而研究有关硫化反应的理论对于寻找最佳工艺条件具有重要指导意义。通过热力学计算,对钨钼的硫化行为进行了热力学分析,结果表明:要使钼完全硫化,必须使溶液的pH值低于10;在除钼过程中,为了降低钨损,应在保证钼尽量硫化的情况下控制硫化剂的加入量。

Thermodynamic Analysis on Sulfidation of Molybdate and Tungstate

Separating molybdenum from tungstate is an important process in tungstate extractive metallurgy. Most of the commonly used methods are based on their difference in affinity to sulfur. Under certain condition molybdenum ions can be sulfurized into thiomolybdate (such as MoS42-) and then be removed. So the knowledge about the theory of sulfuration is vital for optimizing operation condition. It is found that, for complete sulfidation, the solution pH should be kept less than 10, and during the process, the dosage of sulfidizer should be minimized for reducing the loss of tungstate while molybdenum ions are sulfurized as much as possible.