钼的硫化反应热力学分析

来源期刊：中南大学学报(自然科学版)2001年第3期

论文作者：霍广生 赵中伟 吴保林

文章页码：259 - 261

关键词：钼;硫代钼酸根;硫化反应;热力学

Key words：molybdenum; thiomolybdate; sulfidation reaction; thermaldynamic

摘    要：钨钼分离是钨提取冶金中的1道重要工序.目前工业上应用的分离方法大都基于钨和钼对硫亲和力的差异,在一定条件下使MoO^2-₄硫化为MoS^2-₄而进一步除去,因而研究有关硫化反应的理论对于寻找最佳工艺条件有重要指导意义.作者通过热力学计算,对钼的硫化行为进行了考察.研究结果表明:为使钼完全硫化,溶液的pH值要低于8;实践中所采用的n(S)=4n(Mo)且溶液中游离0·125 mol/L,远超过热力学平衡需要,实际上是考虑到动力学原因;在上述条件下钼可完全硫化.

Abstract: Separating molybdenum from tungstate is an important process in tungstate extractive metallurgy.Most of the commonly used method are based on their difference in affinityto sulfur. Under certain conditionmolybdenum ions can be sulfurized into thiomolybdate (such as MoS^2-₄) and then be removed.So the knowledge about the theory of sulfuration is vital for optimizing the operation condition . In this paper the sulfidation behaviour of molybdate ionwas studied through thermaldynamic calculation.It is found that, for complete sulfidation,the solution pHshould be kept less than 8, 4 g/L free sulfur exceeding the stoichiometic amount used in practice is farmore than that needed for thermaldynamic equilibrium, owning to the slowreaction kinetics. Whether theMo concentration is high or low, 4 g/L free sulfur exceeding stoichiometric amount is enough.