加压碱溶法从氧化铝基废催化剂中回收钯

Recovery of Palladium from the Alumina-Based Waste Catalysts by Pressurized Alkali Dissolution Method

研究了加压碱溶载体法从氧化铝基含钯废催化剂中回收钯的工艺。在高压釜中,反应温度200℃,压力12 kg/cm2,时间6 h,氧化铝载体的溶解效率大于95%;选择甲酸钠作为抑制剂,可将钯在溶液中的浓度降低至0.0005 g/L以下;富集物经溶解-精炼得到纯度大于99.98%的海绵钯,钯直收率为99.02%。

The process of recovering palladium from the alumina-based waste catalysts by pressurized alkali dissolution method was studied. At the reaction temperature of 200℃, pressure of 12 kg/cm2, and the reaction time of 6 h in the autoclave, the dissolution efficiency of alumina carrier is more than 95%.With sodium formate as inhibitor, the concentration of palladium in solution can be reduced to less than 0.0005 g/L. By dissolving-refining the purity of sponge palladium could be reached to over 99.98%, and the direct recovery of palladium was 99.02%.