熔融铁粉捕集回收废催化剂中金属钯

Molten Iron Powders Trapping and Recovering Palladium in Spent Catalyst

根据FactSage 6.4计算的渣系等温相图,选取w(Al 2O 3)为30%左右的高铝体系为目标熔渣,采用中频感应炉熔炼,铁粉为捕集剂对废催化剂中的钯元素进行了回收.研究了熔渣体系二元碱度及捕集剂用量等对钯回收率的影响,分析了合金、尾渣成分及其微观形貌.结果表明,当熔炼温度为1550℃,熔渣体系二元碱度m CaO/m SiO 2为0.6,m铁粉/m废催化剂为0.2时,钯元素回收率高达99%以上,回收效率最佳.尾渣呈深绿色玻璃态,钯含量低于5 g/t,铁合金中富集钯的质量分数为0.76%,实现了废催化剂中钯资源的高效回收.

According to the isothermal phase diagram of a slag system calculated from FactSage 6.4 software,a high-aluminum system with w(Al 2O 3)about 30%was chosen as the target slag.The recovery of palladium from spent catalyst was carried out by using iron powers as the collector and smelting in MF induction furnace.The effects of binary basicity of the slag system and the amount of collector on the recovery rate of palladium were studied,and the composition and micro-morphology of the alloy and tail slag were analyzed.The results show that when the smelting temperature is 1550℃,the binary basicity(m CaO/m SiO 2)of the slag system is 0.6,and when the mass ratio between the iron powder and spent catalyst is 0.2,the recovery rate of palladium is up to 99%,leading to the greatest recovery efficiency.The tailings stand a dark green glass state with the palladium content less than 5 g/t,and the mass fraction of palladium enriched in the ferroalloy is 0.76%.The results indicate the recovery of palladium resources in spent catalyst can be realized efficiently.