| PGMs and valuable metals include lanthanum, cerium and zirconium, were comprehensive recycled from a variety of spent automotive catalysts (SAC) by conventional hydrometallurgical leaching, pretreatment-water leaching, and hydrometallurgical leaching again that is "Double Hydrometallurgical Method as a metallurgical breakthrough. X-ray fluorescence method, spectrophotometry, ICP-AES method, scanning electron microscopy and X-ray diffraction were used for analysis and characterization. The results show that the leaching rates of platinum, palladium, and rhodium have been increased by 7%~30%, 2%, 18%~21%, respectively, and the final leach residue rate is 30%~35% by using of the "Double Hydrometallurgical Method over PGMs from SAC. At the same time, the valuable metals of lanthanum, cerium, zirconium are effectively recovered, the comprehensive recovery of cerium, zirconium is more than 92%. |
