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Pretreatment method for precious metal in scraped automobile exhaust catalyst

A technology for scrapped cars and spent catalysts, applied in the direction of improving process efficiency, etc., can solve problems such as poor separation effect and low recovery rate

Inactive Publication Date: 2014-05-28
上海派特贵金属环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the existing separation and purification methods have low recovery rates and poor separation effects due to the use of catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Crumble the spent catalyst containing precious metals, add a certain proportion of covering agent sodium formate to further grind, grind evenly and put it into a roasting furnace for roasting, the roasting temperature is 500, the roasting time is 2, after the roasting is completed, put it into the furnace and pass it into the furnace to reduce 1, After the above-mentioned spent catalyst fragments are cooled in the furnace, they are leached in acid, and a dissolving agent is added to the acid. The dissolving agent is sodium fluoride solution, and the leaching rate is 92%.

Embodiment 2

[0028] Crush the spent catalyst containing precious metals, add a certain proportion of covering agent sodium formate for further grinding, and put it into a roasting furnace for roasting after grinding evenly. , After the above-mentioned waste catalyst fragments are cooled in the furnace, they are leached in acid, and a dissolving agent is added to the acid. The dissolving agent is sodium fluoride solution, and the leaching rate is 90%.

Embodiment 3

[0030] Crush the spent catalyst containing precious metals, add a certain proportion of covering agent sodium formate to further grind, grind evenly, put it into a roaster for roasting, the roasting temperature is 500°C, and the roasting time is 2.5h, after the roasting is completed, put it into the furnace and pass it into the furnace for reduction After 2 hours, the spent catalyst fragments treated above were cooled in the furnace and then leached in acid. A dissolving agent was added to the acid. The dissolving agent was sodium fluoride solution, and the leaching rate was 92%.

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PUM

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Abstract

The invention discloses a pretreatment method for precious metal in a scraped automobile exhaust catalyst. The pretreatment method is characterized by comprising the following steps: (1) crushing a dead catalyst containing the precious metal; (2) adding a certain proportion of covering agent for further grinding; (3) after the dead catalyst is uniformly ground, putting the dead catalyst into a roasting furnace, and roasting the dead catalyst; (4) after roasting is finished, putting the dead catalyst into a furnace, introducing nitrogen, and carrying out reduction treatment; (5) cooling the treated crushed dead catalyst in the furnace, and then putting the treated crushed dead catalyst in acid for leaching. The pretreatment method aims at solving the problems of low recovery rate and poor separation effect in recovery of an automobile exhaust catalyst due to a poor pretreatment method in the prior art.

Description

technical field [0001] The invention relates to the field of precious metal catalyst recovery, in particular to a pretreatment method for precious metals in scrapped automobile exhaust catalysts. Background technique [0002] my country's automobile industry is developing rapidly, and automobile sales are increasing at an annual rate of about 20%. In 2012, the total number of automobiles in society has reached 120 million. Corresponding to the substantial increase in the number of automobiles, the emission of automobile exhaust has also increased exponentially. [0003] Platinum group metals have the unique ability to purify automobile exhaust, and more than 60% of platinum and palladium are used in the production of automobile exhaust purification catalysts every year. With the increase in the number of cars and the improvement of environmental protection standards, the demand for platinum group metals will further increase. However, due to the scarcity and high price of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00
CPCY02P10/20
Inventor 刘仕佳
Owner 上海派特贵金属环保科技有限公司