从钴钼废催化剂中回收钼的新工艺研究

The new process for recovery of molybdenum from spent catalysts

研究了从废催化剂中回收钼的新工艺,首先采用碳酸钠焙烧,再用热水浸取。分析了催化剂的颗粒度、焙烧条件、浸取条件对浸取率的影响。实验结果表明:回收钼的最佳工艺条件为,废催化剂颗粒度≤122μm、焙烧温度750℃、焙烧时间2 h、浸取温度75℃、浸取时间4 h、液固质量比6∶1。在此条件下,钼的浸取率达到93%以上,产品钼酸钠的纯度达95%以上。该工艺具有能耗低,浸出率高等优点,具有潜在的应用前景。

A new process for molybdenum recovery from spent catalysts has been studied,which includes the roasting with sodiun carbonate first and then the leaching with hot water. The effect of preparation conditions, such as particle size of the spent catalysts, roasting and leaching conditions on the leaching rate of molybdenum has been analyzed. The results of the test show that the optimum technological conditions for recovering molybdenum are the particle size of the spent catalysts 122 μm, roasting temperature 750 ℃, roasting time 2 h, leaching temperature 75 ℃ leaching time 4 h, the ratio of liquid and solid 6： 1. Under this operation condition, the recovering rate of molybdenum is over 93% and purity of sodium molybdate dihydrate over 95%. The new process has advantages of saving energy and high leaching rate of molybdenum, this process has potential practical prospects.