Analysis of the fundamental characteristics of spent automotive catalytic converter and its effect on rare precious metal recovery
Spent automotive catalytic converters represent significant secondary resources of rare precious metals.With the increasing number of scrapped cars in the future,the quantity of SACs will correspondingly increase.Thus there are currently many methods for recycling rare precious metals(platinum group metals,rare earth metals,and other rare metals),but due to insufficient understanding of the characteristics of SACs,most recycling methods are not ideal in terms of recovery rate,environmental friendliness,and economic viability.There is a pressing requirement for a dependable and thorough scientific comprehension of SACs.In this paper,to comprehensively understand the spent automotive catalyst converter,a stuy was conducted on the fundamental characteristics,phases and component compositions,the existence form of precious metal elements such as PGMs,Ree,Zr,and the migration and distribution status,melting process of elements.The research has uncovered the deactivation mechanism of catalyst failure and decommissioning,which is caused by various factors including partial oxidation of platinum group metals in the catalyst,permeation and transfer of active components,inhomogeneous distribution of valuable elements,burnout and cracking of the catalyst coating,as well as pollution from impurity elements.The problems caused by the characteristics of waste catalysts can be avoided effectively by using fire smelting and selecting the slag and collector to recover the rare and precious metal.
spent automotive catalytic converterrare precious metalsplatinum group metalshydrometallurgical leachingpyrometallurgyoccurrence characteristic
万方数据
维普
