通过常规湿法浸出-预处理-再次湿法浸出的"双湿法"工艺,综合回收多种汽车失效催化剂(SAC)中的铂族金属(PGMs)及有价金属镧、铈和锆.采用X射线荧光法、分光光度法、ICP-AES法、扫描电镜及X射线衍射进行分析表征.结果表明,"双湿法"工艺可使铂、钯、铑的浸出率比常规湿法浸出分别提高了7%~30%、2%、18%~21%,PGMs的回收率大于95%,浸出渣率为30%~35%;镧、铈和锆同时得到有效回收,其中铈、锆的综合回收率大于92%.
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" to recover 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%.
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