Method for recycling platinum group metals from iron carrier invalid automobile exhaust catalyst

Abstract

The invention discloses a method for recycling platinum group metals from an iron carrier invalid automobile exhaust catalyst. The method is characterized by comprising the following steps: (1) crushing an invalid catalyst, and collecting powder particles; (2) separating the powder particles and broken pieces in an ultrasonic cleaner; cleaning the surface of a metal piece, and performing combined filtration on a cleaned liquid and a liquid in the ultrasonic cleaner; (3) drying filter residues, roasting, and taking out solids; (4) crushing; (5) adding powder into a reaction kettle, adding hydrochloric acid according to a solid-to-liquid ratio of 1:(1-5), heating, introducing chlorine below the liquid level, filtering after reaction ends, and washing a filter cake by using deionized water which accounts for 0.5-5 times of the weight of solids under the conditions that the leaching reaction temperature of the platinum group metals is 40-90 DEG C and the reaction time is 2-10 hours to obtain a leaching liquid; and (6) sequentially performing extraction separation on the leaching liquid by using a Pd extraction agent, a Pt extraction agent and an Rh extraction agent, wherein the Pd extraction agent is one of diisoamyl sulfide, di-n-octyl sulfoxide and 2-hydroxy-5-octyl diphenylketoxime, the Pt extraction agent is trialkylamine, and the Rh extraction agent is tributyl phosphate.

Description

technical field

[0001] The invention relates to the technical field of recovering metals from exhausted automobile exhaust catalysts, and in particular provides a method for recovering platinum group metals from exhausted automobile exhaust catalysts on iron carriers. Background technique

[0002] As one of the largest application fields of platinum group metals, automobile exhaust catalyst consumes a large amount of platinum group metals every year. At the same time, a large number of exhaust catalysts are produced every year, not only in large quantities, but also with a much higher platinum group metal content than the richest ore bodies, and a relatively short extraction process. Therefore, exhaust catalysts for automobile exhaust have become the most important secondary resources of platinum group metals, and all major industrialized countries in the world attach great importance to the recovery of exhaust catalysts for automobile exhaust. Especially in my country in r...

Images