失效氧化铝载体催化剂中钯的铁捕集研究

Recovery of palladium in spent Al_(2)O_(3)-based catalyst by iron collecting

以铁为捕集剂,对氧化铝载体废催化剂中钯金属进行了火法回收。采用单因素实验评估了熔渣性质、熔炼时间和铁粉粒度等因素对钯捕集率的影响。结果表明,当温度为1550℃,二元碱度ω(CaO)/ω(SiO_(2))为0.5时,熔渣体系粘度降低到0.6 Pa·s,钯捕集率达到98.6%;基于优化的熔渣,保温熔炼1 h以上,渣金分离良好,钯捕集率达到最优水平;铁粉粒度减小到120~250μm,钯捕集率达到99%以上,适当降低捕集剂粒度可以有效提高钯捕集率。

The recovery of palladium in spent Al2O3-based catalysts using iron as the collector was studied by pyrometallurgical smelting.The effects of slag properties,smelting time and iron particle size on the collecting rate of palladium were evaluated by single factor experiment.The results showed that the collecting rate of palladium reached to 98.6%at 1550℃,with 0.5 of binary basicityω(CaO)/ω(SiO_(2))and 0.6 Pa·s of slag viscosity.The separation between ferroalloy and slag was basically completed after smelting over 1 hour,and the optimal collecting rate of palladium was obtained.When the particle size of iron powder decreased to 120~250μm,the collecting rate of palladium was above 99%.Appropriately reducing particle size of the collector can effectively improve the collecting rate of palladium.