Method for recovering rare noble metals from spent automobile exhaust catalyst

A technology for automobile exhaust and rare and precious metals, applied in the direction of improving process efficiency, etc., can solve the problems of low recovery rate of rare earths and platinum group metals, difficult recovery of rare earths, waste of resources, etc., and achieve short leaching time, environmental friendliness and high recovery rate Effect

Active Publication Date: 2019-08-30
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many studies on the recovery of platinum group metals from exhausted automobile exhaust catalysts, but there are few studies on the comprehensive recovery of rare earths and platinum group metals. The reason is that the recovery rates of rare earths and platinum group metals are low when conventional wet processes are used. At the same time, the amount of waste water is large, and when the pyrotechnic process is directly used, the rare earth will enter the slag and it is difficult to recycle, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for recovering rare and precious metals from exhausted automobile exhaust catalysts is carried out in sequence as follows:

[0022] A. Abrasives: crush and grind the exhausted automobile exhaust catalyst, and the grinding particle size is 30 meshes to obtain the exhausted automobile exhaust catalyst powder;

[0023] B. Pressurized acid dissolution: Weigh 1000g of the ground invalid automobile exhaust catalyst powder, add 10000ml of HCl with a concentration of 2mol / L, stir in a high-pressure reactor and heat to 105°C, the reaction pressure is 0.1Mpa, the temperature is 0.5h, and cooled Filter to obtain leach solution L and 247g leach slag S, sample and analyze the content of lanthanum and strontium in the leach solution L, and calculate the recovery rate of lanthanum in the leach solution to be 95.2%, and the recovery rate of strontium to be 95.6%.

[0024] C. Granulation: Add 98.8g of CaO with a particle size of 30-200 mesh and 24.7ml of water to the leaching s...

Embodiment 2

[0027] A method for recovering rare and precious metals from exhausted automobile exhaust catalysts is carried out in sequence as follows:

[0028] A. Abrasives: crush and grind the exhausted automobile exhaust catalyst, and the grinding particle size is 50 mesh, so as to obtain the exhausted automobile exhaust catalyst powder;

[0029] B. Pressurized acid dissolution: Weigh 1000g of ground invalid automobile exhaust catalyst powder, add 6000ml of HCl with a concentration of 6mol / L, stir in a high-pressure reactor and heat to 120°C, reaction pressure 1.5Mpa, constant temperature 2.5h, cool Filter to obtain leach solution L and 240g leach slag S, sample and analyze the content of lanthanum and strontium in the leach solution L, and calculate the recovery rate of lanthanum in the leach solution to be 96.1%, and the recovery rate of strontium to be 95.4%.

[0030] C. Granulation: Add 72g of CaO with a particle size of 30-200 mesh and 16.8ml of water to the leaching slag S. After ...

Embodiment 3

[0033] A method for recovering rare and precious metals from exhausted automobile exhaust catalysts is carried out in sequence as follows:

[0034] A. Abrasives: crush and grind the exhausted automobile exhaust catalyst, and the grinding particle size is 80 meshes to obtain the exhausted automobile exhaust catalyst powder;

[0035] B. Pressurized acid dissolution: Weigh 1000g of the exhausted automobile exhaust catalyst powder that has been ground, and add H with a concentration of 4mol / L. 2 SO 4 4000ml, stirred in a high-pressure reactor and heated to 180°C, the reaction pressure was 3Mpa, the constant temperature was 5h, cooled and filtered, and the leachate L and 233g leach residue S were obtained, and the content of lanthanum and strontium in the leachate L was analyzed by sampling, and the content of lanthanum in the leachate was calculated. The recovery rate was 96.7%, and the recovery rate of strontium was 96.9%.

[0036] C. Granulation: Add 6.60 g of CaO with a parti...

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Abstract

The invention relates to the field of comprehensive utilization of noble metal secondary resources, and in particular relates to a method for recovering rare noble metals from a spent automobile exhaust catalyst. The method for recovering the rare noble metals from the spent automobile exhaust catalyst sequentially comprises the following steps of A, grinding materials; B, carrying out pressurizedacid dissolution; C, granulating; and D, smelting and recovering platinum group metals. The method is simple in process and high in rare-earth elements recovery rate.

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 rare and precious metals from exhausted automobile exhaust catalysts. Background technique [0002] Due to their excellent chemical catalytic activity, rare earths and precious metals are widely used in industrial catalysis. However, my country is a poor country of platinum group metal resources, and the annual mineral production of platinum group metals is only about 3 tons. However, my country's annual demand for platinum group metals exceeds 120 tons, which is largely dependent on imports. At the same time, my country is a big country in automobile production. The amount of platinum group metals used in automobile exhaust purification systems is nearly 100 tons per year, with an output value of more than 20 billion yuan. At the same time, rare earth lanthanum and cerium are used, with an annual consumption o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/24C22B11/02C22B26/20C22B59/00C21B13/00
CPCC21B13/0006C22B1/2406C22B7/007C22B7/009C22B11/026C22B26/20C22B59/00Y02P10/20
Inventor 李勇杨泉熊庆丰赵雨谭文进王欢刘文吴喜龙肖雄宁显雄王华姚宇
Owner GUIYAN RESOURCE YIMEN
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