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针对钨酸盐溶液中钼的硫化进行了系统的热力学分析和试验研究。热力学分析表明 ,在一定的条件下MoO2 - 4可以完全被硫化为MoS2 - 4,其硫化程度随溶液pH的降低和硫化剂用量的增加而提高 ,并查明了MoS2 - 4、MoOS2 - 3、MoO2 S2 - 2 、MoO3S2 - 和MoO2 - 4随溶液pH值及硫化剂用量变化的分布情况。同时通过试验研究进一步考察了溶液pH值、S2 - 用量、硫化温度及硫化时间对硫化效果的影响 ,查明了钨酸盐溶液中钼的硫化规律 ,并获得了合理的硫化工艺条件 ,即在预调pH <7.5、S2 - 游离 1.5～ 2 .0g L或预调pH =7.5～ 8.0、S2 - 游离 2 .0～ 3 .0g L的条件下 ,在 70～ 75℃下保温 1.5～ 2 .0h即可获得较好的硫化效果
A systematic thermodynamic analysis and experimental study on molybdenum sulfidation in tungstate solution has been carried out. Thermodynamic analysis shows that under certain conditions, MoO2 - 4 can be fully sulfided to MoS2 - 4. The degree of sulfidation increases with the decrease of solution pH and the amount of sulfidizing agent. MoS2 - 4, MoOS2 - 3, Distribution of MoO2 S2 - 2, MoO3S2 - and MoO2 - 4 with pH Value and Sulfidizing Agent Dosage. At the same time, the effects of solution pH value, S2 - dosage, curing temperature and curing time on the vulcanization effect were further investigated through experimental studies. The vulcanization rule of molybdenum in tungstate solution was ascertained, and reasonable vulcanization conditions were obtained. Preconditioning pH <7.5, S2-free 1.5-2.0g L or preconditioning pH = 7.5-8.0, S2-2.0-3.0g L, and keeping the temperature at 70-75 DEG C for 1.5-2. 0h to get better curing effect