煤焦油加氢废钼催化剂中回收钼的实验研究

Experimental study on recovery of Mo from spent molybdenum-based catalyst for hydrogenation of coal tar

为了最大化地回收废钼催化剂、解决废催化剂的处置问题及减少矿物资源的开采,采用Na2CO3焙烧-水浸法回收废钼催化剂。利用X射线能谱分析、电感耦合等离子体发射光谱分析、火焰原子吸收光谱分析和X射线衍射分析对样品进行表征,保持水浸过程变量不变,对焙烧过程的焙烧温度、Na2CO3质量和焙烧时间等变量进行优化,并对不同条件下的XRD谱图进行分析。优化后的工艺条件为:焙烧温度为700℃、Na2CO3质量为2 g、焙烧时间为80 min,此条件下钼的回收率可达到90.79%。

In order to maximize the recovery of spent Mo-based catalyst,solve the disposal problem of spent catalyst and reduce the mining of mineral resources,Na2CO3 roasting-water leaching method is used to recover spent Mo catalyst.Spent Mo-based catalyst samples are measured by electronic dispersive spectrometer,inductively coupled plasma atomic emission spectrometer,flame atomic absorption spectroscopy and X-ray diffractometer.Three operating parameters such as roasting temperature,Na2CO3 amount and roasting time are optimized in Na2CO3 roasting process while water leaching parameters remain unchanged,and XRD patterns are analyzed at different operating conditions.The optimized conditions are obtained as follows:the roasting temperature maintains at 700℃,the dosage of Na2CO3 is 2 g and the roasting time is80 min.Under these optimum conditions,Mo recovery rate reaches 90.79%.