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Method for purifying platinum group metal from waste three-way catalyst

A three-way catalyst, platinum group metal technology, applied in the direction of improving process efficiency, can solve problems such as low energy consumption of platinum group metal

Active Publication Date: 2013-06-05
SHENYANG RES INST OF NONFERROUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problems existing in the recovery method of platinum group metals from waste automobile catalysts, it provides a method for adding catalyst pretreatment and using different oxidants for leaching in the recovery process of platinum group metals A method for purifying platinum group metals from spent three-way catalysts, which has the characteristics of good working environment, high yield of platinum group metals, and low energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 2000g of spent three-way catalysts containing platinum, palladium, rhodium and three noble metal elements, crush them to at least 200 meshes with a jaw crusher, roast at 600°C for 2h, boil 3L of pure water containing 40g of sodium borohydride for 20min, and use Soak in 3L of pure water at 80℃ for 20min. Add 130g of sodium chloride, 60g of sodium chlorite and 0.5L of HCl in 3L of aqueous solution for leaching for 3 hours, then filter with suction, pickle twice with 10% dilute HCl, wash once with water, combine the extracts and washes, concentrate to 3L, and concentrate Afterwards, the leaching solution is added to the resin to separate the platinum group metals, purified, and tested.

[0019] result.

[0020] Platinum recovery rate: 95.5%, the purity of platinum sponge produced is 99.95%.

[0021] Palladium recovery rate: 95.87%, and the purity of palladium sponge produced is 99.96.

[0022] Rhodium recovery rate: 85.8%, and the purity of rhodium sponge produced i...

Embodiment 2

[0024] Take 2000g of spent catalyst containing platinum, palladium and rhodium, grind it to 200 meshes with a jaw crusher, roast it at 600°C for 2h, boil it in 3L of pure water containing 60g of sodium borohydride for 20min, then soak it in 3L of pure water at 80°C 20min. Add 150g of sodium chloride, 80g of sodium chlorite and 0.5L HCl in a 3L aqueous solution for leaching for 4 hours, then filter with suction, pickle twice with 10% dilute HCl, and wash once with water. Add resin to separate platinum group metals, purify and test.

[0025] result.

[0026] Platinum recovery rate: 95.5%, the purity of platinum sponge produced is 99.95%.

[0027] Palladium recovery rate: 95.87%, and the purity of palladium sponge produced is 99.96.

[0028] Rhodium recovery rate: 85.8%, and the purity of rhodium sponge produced is 99.95.

Embodiment 3

[0030] Take 1000g of spent catalyst containing platinum, palladium and rhodium, grind it to 200 meshes with a jaw crusher, roast it at 600°C for 1h, boil it in 3L of pure water containing 30g of sodium borohydride for 20min, then soak it in 3L of pure water at 80°C 20min. Add 120g of sodium chloride, 40g of sodium chlorite and 0.4L HCl in a 3L aqueous solution for leaching for 3 hours, then filter with suction, pickle twice with 10% dilute HCl, wash once with water, combine the leachate and washing liquid, concentrate to 3L, and extract the leachate Add resin to separate platinum group metals, purify and test.

[0031] result.

[0032] Platinum recovery rate: 95.45%, the purity of platinum sponge produced is 99.95%.

[0033] Palladium recovery rate: 95.6%, and the purity of the produced sponge palladium is 99.95.

[0034] Rhodium recovery rate: 85%, and the purity of rhodium sponge produced is 99.95.

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Abstract

The invention discloses a method for purifying platinum group metal from a waste three-way catalyst. The method is characterized by comprising the following steps. Firstly, the waste three-way catalyst is obtained through crushing, grinding and high-temperature roasting, boron hydrogen sodium aqueous solution is added, and boiling and reduction are performed. Secondly, a stock solution is filtered, a hydrochloric acid solution by sodium chloride and sodium chlorite is added, a solid catalyst is obtained through infusion and filtering, acid cleaning and water cleaning are performed, washing liquid and a leaching agent are combined, concentrated and tested. Thirdly, separation of platinum group metal is performed on the leaching agent, purification is performed, and high-purity platinum group metal is obtained. Aiming at the problems in an existing method for recycling platinum group metal from a waste vehicle catalyst, the method for adding catalyst pretreatment and using of different oxidants in the procedures of recycling the platinum group metal for producing the leaching agent is raised, the method for purifying the platinum group metal from the waste three-way catalyst is good in working environment, high in platinum group metal yield, and low in energy consumption.

Description

technical field [0001] The present invention relates to a method for recycling waste automobile catalysts, in particular to a method for purifying platinum group metals from waste three-way catalysts. Recycling and precious metal metallurgy technology field. Background technique [0002] At present, the recovery methods of platinum group metals in waste auto catalysts can be mainly divided into pyrotechnic method and wet method. The basic process of fire extraction of platinum group metals is to add the autocatalyst to the molten metal collector, heat and melt, separate the alloy phase from the slag phase, and dissolve the alloy phase with strong acid to make the platinum group metals enter the solution. However, pyrometallurgical extraction of platinum group metals is complicated, consumes a lot of energy and raw materials, requires high equipment, and is not easy to solve the problem of environmental pollution, so it is not suitable for promotion. [0003] Wet treatment ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/10C22B11/00
CPCY02P10/20
Inventor 李岩松王大维姜炳南白小叶王蓓
Owner SHENYANG RES INST OF NONFERROUS METALS
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