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

A technology of automobile exhaust and platinum group metals, applied in the direction of improving process efficiency, etc., can solve problems such as by-product pollution, achieve the effects of reducing the emission of three wastes, less consumption, and convenient absorption and treatment

Active Publication Date: 2015-01-21
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main methods for recovering platinum group metals from exhaust catalysts at home and abroad include plasma smelting, pyrochlorination and volatilization, copper capture, pressurized cyanidation, active component (ie platinum group metals) dissolution, etc. , the above methods are relatively mature and have achieved industrial results, but they are only for cordierite carrier catalysts, and there are still some iron-carrier automobile exhaust catalysts on the market that are not suitable for the above methods, even if some of the above methods can be used However, there will be a large number of by-products and pollution, which is not advisable in today's increasingly important environmental protection

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Crush the expired catalyst until the size of the broken iron sheet is about 10x10mm, and collect the powder particles generated during the crushing process.

[0019] 2) Put the powder particles collected during the crushing process together with the crushed fragments into an ultrasonic cleaning machine for ultrasonic separation, react for 2 hours, remove the iron sheet from the machine and clean its surface with water, the cleaned liquid and ultrasonic The liquid in the washing machine is combined and filtered.

[0020] 3) Put the filtered residue in an oven for 5 hours at 110° C., then put the dried solid in a muffle furnace at 1400° C. for 16 hours. After the muffle furnace cools down, take the solid out and cool it to room temperature.

[0021] 4) Add the calcined solid into a pulverizer for pulverization, and all pulverized powders pass through a 100-mesh standard sieve.

[0022] 5) Add the powder into a reaction kettle equipped with stirring, a thermometer and ...

Embodiment 2

[0026] 1) Crush the expired catalyst until the size of the broken iron sheet is about 25x25mm, and collect the powder particles generated during the crushing process.

[0027] 2) Put the powder particles collected during the crushing process together with the crushed fragments into an ultrasonic cleaning machine for ultrasonic separation, react for 5 hours, remove the iron sheet from the machine and clean its surface with water, the cleaned liquid and ultrasonic The liquid in the washing machine is combined and filtered.

[0028] 3) Put the filtered residue in an oven to dry at 130°C for 2h, then put the dried solid in a muffle furnace at 1100°C for 22h, and take out the solid after the muffle furnace cools down and cool it down to room temperature.

[0029] 4) Put the calcined solid into a pulverizer for pulverization, and all pulverized powders pass through a 200-mesh standard sieve.

[0030] 5) Add the powder into a reaction kettle equipped with stirring, a thermometer and...

Embodiment 3

[0034] (1) Crush the invalid catalyst until the size of the broken iron sheet is about 40x40mm, and collect the powder particles generated during the crushing process.

[0035] (2) Put the powder particles collected during the crushing process together with the crushed fragments into an ultrasonic cleaning machine for ultrasonic separation, react for 8 hours, remove the iron sheet from the machine and clean its surface with water, the cleaned liquid and The liquid in the ultrasonic cleaner is combined and filtered.

[0036] (3) Put the filtered residue into an oven to dry at 120°C for 5h, then put the dried solid into a muffle furnace for 3h at 1500°C, and take out the solid to cool to room temperature after the muffle furnace cools down.

[0037] (4) Add the calcined solid into a pulverizer for pulverization, and all pulverized powders pass through a 400-mesh standard sieve.

[0038] (5) Add the powder into a reaction kettle equipped with stirring, a thermometer and connecte...

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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...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 安峰叶学海
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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