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Method for enriching platinum group metal from invalid automobile exhaust catalyst metal carriers

A technology of catalyst metals and platinum group metals, which is applied in the direction of improving process efficiency, etc., to achieve the effects of simple operation, high platinum yield and low cost

Inactive Publication Date: 2017-01-04
KUNMING METALLURGY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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This method has not been reported in the literature review

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  • Method for enriching platinum group metal from invalid automobile exhaust catalyst metal carriers

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Embodiment 1

[0026] See attached figure 1 , Conditions: 1000g of exhaust gas catalysts with metal carriers, smelted in a plasma furnace, atomized and sprayed to form fine powders containing platinum group metals; base metals were leached with sulfuric acid, the dosage was 60% of the weight ratio of the alloy matte phase, and the temperature was 55 ℃, the time is 4h, the liquid-solid ratio is 5:1, the enrichment of platinum group metals reaches 25 times, and the yield is 98.67%.

Embodiment 2

[0028] See attached figure 1 , Conditions: 3000g of exhaust gas catalysts with metal carriers, smelted in a high-frequency furnace, cooled with water, crushed to form fine powders containing platinum-group metals; base metals were leached with sulfuric acid, the dosage was 80% of the weight ratio of the alloy matte phase, and the temperature was 85°C for 4 hours, the liquid-solid ratio was 5:1, the enrichment of platinum group metals reached 30 times, and the yield was 99.10%.

Embodiment 3

[0030] See attached figure 1 , Conditions: 5000g of exhaust gas catalyst on metal carrier, smelted in a high-frequency furnace, atomized and sprayed to form a fine powder containing platinum group metals; leached with hydrochloric acid, the dosage is 50% of the weight ratio of the alloy matte phase, and the temperature is 65°C , the time is 5h, the liquid-solid ratio is 3:1, the enrichment of platinum group metals reaches 24 times, and the yield is 98.67%.

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Abstract

The invention discloses a method for enriching platinum group metal from invalid automobile exhaust catalyst metal carriers. The method includes the steps that the invalid automobile exhaust catalyst metal carriers are directly added into a high-temperature melting furnace to be melted, molten products are poured onto a water cooler to be quickly cooled or atomized to spray powder, through quick cooling on the water cooler, platinum group metal alloy is made to form brittle alloy which can be conveniently smashed into small particles, and through atomization and powder spraying, fine alloy containing platinum group metal is formed; and acid is added into the fine alloy containing platinum group metal to selectively leach base metal, and through filtering and washing, platinum group metal concentrate is obtained, so that efficient enrichment of the platinum group metal is achieved. According to the method, during high-temperature smelting, the metal carriers are used as a platinum group metal collector, no collector needs to be added, after melting, the platinum group metal enters alloy melt and then is subjected to cooling or atomization powder spraying subsequently, the fine-particle alloy is formed to facilitate selective leaching of the base metal, and therefore the whole process is simple in operation, high in platinum yield, high in enrichment ratio, environmentally friendly and low in cost, and the industrial application prospects are good.

Description

technical field [0001] The invention belongs to the field of metallurgy of rare and precious metals, and relates to a method for enriching platinum group metals from metal carriers of spent automobile exhaust catalysts. Background technique [0002] Carriers of exhausted automobile exhaust catalysts include cordierite and metal supports. At present, the methods for enriching or extracting platinum group metals from exhausted automobile exhaust catalyst carriers are as follows: [0003] An Feng et al. invented a method for recovering platinum group metals from exhaust catalysts on iron carriers (application publication number: CN104294048A), which is characterized in that the steps are: 1) crush the expired catalyst and collect powder particles; 2) powder particles Put it into an ultrasonic cleaning machine for separation from the fragments; clean the surface of the iron sheet, and filter the cleaned liquid with the liquid in the ultrasonic cleaning machine; 3) Dry the filter...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 范兴祥余宇楠杨建中
Owner KUNMING METALLURGY COLLEGE
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