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Method for recovering precious metal from spent automobile catalyst

A technology of automotive catalysts and precious metals, applied in the direction of improving process efficiency, etc., can solve problems such as high cost, difficult to realize industrialization, and long process flow, etc., and achieve the effects of short production cycle, easy industrial production, and significant economic benefits

Inactive Publication Date: 2021-10-29
福建有道贵金属材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of the above invention is that the process flow is long, the cost is high, and it is difficult to realize industrialization

Method used

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  • Method for recovering precious metal from spent automobile catalyst

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Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1As shown, the exhausted automobile catalyst is ball-milled to 200 mesh, and 600 kilograms are weighed for subsequent use. The content platinum of the precious metal is 168ppm, palladium is 2130ppm, and rhodium is 215ppm.

[0033] Put 3000 liters of 5mol / L hydrochloric acid into 5m 3 In the enamel reaction kettle, start stirring, add the above 600 kg of materials into the reaction kettle, heat up to 85 ° C, slowly add 60 liters of 10% sodium chlorate solution dropwise, keep warm for 4 hours, and cool.

[0034] Filter and wash the above solution, and combine the filtrate and washing solution. Then the filter residue was dried and weighed. The insoluble residue was 417.8 kg, and the residue rate was 69.63%. Sampling analysis shows that the precious metal content in the slag is 18.41ppm platinum, 87.18ppm palladium, and 116.47ppm rhodium, and the dissolution rate of the deleted precious metal is: 92.37% platinum, 97.15% palladium, and 62.28% rhodium. The ...

Embodiment 2

[0041] The exhausted automobile catalyst is ball milled to 200 mesh, and 500 kilograms are weighed for subsequent use. The content of the precious metal is 185ppm for platinum, 2103ppm for palladium, and 236ppm for rhodium.

[0042] Put 3000 liters of 5mol / L hydrochloric acid into 5m 3 In the enamel reaction kettle, start stirring, add the above-mentioned 500 kg of materials into the reaction kettle, raise the temperature to 85°C, slowly add 50 liters of 10% sodium chlorate solution dropwise, keep it warm for 4 hours, and cool down.

[0043] Filter and wash the above solution, and combine the filtrate and washing solution. Then the filter residue was dried and weighed, the insoluble residue was 355.2 kg, and the residue rate was 71.04%. Sampling analysis shows that the precious metal content in the slag is 21.32ppm platinum, palladium 85.35ppm, and rhodium 117.25ppm. The dissolution rate of precious metals is: platinum 91.81%, palladium 97.14%, rhodium 64.70%, and the total c...

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Abstract

The invention relates to the field of comprehensive utilization of precious metal secondary resources, in particular to a method for recovering precious metal from a spent automobile catalyst by adopting a wet dissolution-stripping activation-wet dissolution technology. The problem about recycling the precious metal from the spent automobile catalyst is solved. The method specifically comprises the following steps: (1) ball milling: carrying out ball milling on the spent three-way catalyst in a ball mill to 200 meshes, sampling and analyzing, wherein the precious metal comprises 100-300ppm of platinum, 1500-2500ppm of palladium and 100-300ppm of rhodium; (2) aqueous solution chlorination; (3) filtering; (4) stripping and activating; (5) dissolving; (6) filtering; (7) iron powder reduction; and (8) refining platinum, palladium and rhodium. The method has the advantages that (1) the recovery rate of the precious metal is high, the recovery rate of the platinum is greater than 97%, the recovery rate of the palladium is greater than 98.5%, and the recovery rate of the rhodium is greater than 95%; (2) the production period is short, and the economic benefit is remarkable; (3) the operation is simple, and the industrial production is easy to realize; and (4) the environment is better.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of precious metal secondary resources, in particular to a method for recovering precious metals from exhausted automobile catalysts by adopting wet dissolution-stripping activation-wet dissolution technology. Background technique [0002] There are many types of auto catalysts, the earliest one is γ-Al 2 o 3 The granular catalyst as the carrier, the most commonly used one is cordierite (2MgO·2Al 2 o 3 ·5SiO2 2 ) as the carrier of the honeycomb catalyst, due to the different sizes and models of automobiles, the content of precious metals in automobile exhaust catalysts varies greatly. The total content of the precious metals platinum, palladium and rhodium is in the range of 1500-4000ppm. There are many manufacturers of automobiles, and the models and displacements are diversified, which causes the precious metal content in the exhausted automobile catalysts to vary widely. Firstly, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B11/048C22B7/007Y02P10/20
Inventor 李朋何双江邱立成何国业
Owner 福建有道贵金属材料科技有限公司