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Method for recycling rare earth and platinum group metal from spent automobile emission purification catalyst

A technology for purifying catalysts and automobile catalysts, applied in the direction of improving process efficiency, etc., to achieve the effect of simple method, high economic benefit and high dissolution efficiency

Inactive Publication Date: 2016-06-15
KUNMING INST OF PRECIOUS METALS
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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 address the shortcomings of the existing exhaust gas purification catalyst recovery technology, and propose a method for recovering rare earths and platinum group metals from the exhaust gas purification catalyst of invalid vehicles, so as to realize the comprehensive recovery of rare earths and platinum group metals

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  • Method for recycling rare earth and platinum group metal from spent automobile emission purification catalyst

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1, see attached figure 1 1. Finely grind the exhausted automobile exhaust purification catalyst to a particle size range of 74-150 μm, mix the finely ground exhausted automobile exhaust catalyst with concentrated acid sulfuric acid at a mass ratio of 1:1, and roast in a muffle furnace at a temperature of 200° C. for 4 hours; The roasted product is leached with 1mol / L sulfuric acid at 80°C for 3 hours, maintaining a liquid-solid ratio of 3, and after filtration and separation, the rare earth solution and insoluble slag containing platinum group metals are obtained; add sodium sulfate to the rare earth solution and react at 80°C After 3 hours, the precipitation of rare earth sulfate double salt was obtained, separated from other components, and after subsequent treatment, rare earth oxides of lanthanum and cerium were obtained; the insoluble residue was dissolved with hydrochloric acid + chlorine gas, and the platinum group metal solution was processed through t...

Embodiment 2

[0017] Embodiment 2, see attached figure 1 1. Finely grind the exhausted automobile exhaust purification catalyst to a particle size range of 74-90 μm, mix the finely ground exhausted automobile exhaust catalyst with concentrated acid sulfuric acid at a mass ratio of 1:0.8, and keep the temperature in a muffle furnace at 300° C. for 3 hours for roasting; The roasted product is leached with 1mol / L sulfuric acid at 60°C for 4 hours, maintaining a liquid-solid ratio of 3, and after filtration and separation, the rare earth solution and insoluble residue containing platinum group metals are obtained; add sodium sulfate to the rare earth solution and react at 80°C After 3 hours, the precipitation of rare earth sulfate double salt was obtained, separated from other components, and after subsequent treatment, rare earth oxides of lanthanum and cerium were obtained; the insoluble residue was dissolved with hydrochloric acid + chlorine gas, and the platinum group metal solution was proc...

Embodiment 3

[0018] Embodiment 3, see attached figure 1 1. Finely grind the exhausted automobile exhaust purification catalyst to a particle size range of 74-125 μm, mix the finely ground exhausted automobile exhaust catalyst with concentrated acid sulfuric acid at a mass ratio of 1:1.2, and keep the temperature in a muffle furnace at 250° C. for 5 hours of roasting; The roasted product is leached with 0.5mol / L sulfuric acid at 80°C for 4 hours, maintaining a liquid-solid ratio of 4, and after filtration and separation, the rare earth solution and insoluble slag containing platinum group metals are obtained; add sodium sulfate to the rare earth solution, and at 80°C After reacting for 3 hours, the precipitation of rare earth sulfate double salt is obtained, which is separated from other components, and after subsequent treatment, rare earth oxides of lanthanum and cerium are obtained; the insoluble residue is dissolved with hydrochloric acid + chlorine gas, and the platinum group metal solu...

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Abstract

The invention discloses a method for recycling rare earth and platinum group metal from a spent automobile emission purification catalyst. The method comprises the following steps that 1, fine grinding is carried out; 2, sulfatizing roasting is carried out; 3, dilute acid leaching is carried out, wherein a roasted product in the second step is subjected to dilute sulfuric acid leaching, and a rare earth sulfate solution and platinum group metal bearing insoluble slag are obtained after filtering and separating; 4, the rare earth is recycled, wherein sodium sulfate is added to the rare earth sulfate solution obtained in the third step, rare earth sulfate double salt precipitation is generated, and lanthanum-cerium rare earth oxide is prepared; and 5, the platinum group metal is recycled, wherein hydrochloric acid and chlorine are adopted in the insoluble slag obtained in the third step for leaching of the platinum group metal, and leachate is subjected to treatment through an existing separating and purifying refining process, so that platinum, palladium and rhodium of the platinum group metal are obtained. Compared with the prior art, the method can be adopted for effectively recycling the rare earth and the platinum group metal from the spent automobile catalyst, the method is simple and practicable, all needed equipment is mature and universal equipment in the field of metallurgy, and the production cost is low.

Description

technical field [0001] The invention relates to the recovery and utilization of secondary resources of rare and precious metals, in particular to a method for recovering rare earths and platinum group metals from exhausted automobile tail gas purification catalysts. Background technique [0002] Automobile exhaust purification catalysts are the most effective means to control automobile exhaust emissions and reduce pollution. Automobile exhaust purification catalysts containing rare earths have low price, good thermal stability, high activity, good anti-poisoning ability, and long service life. be widely used. The automobile exhaust gas purification catalyst is made of honeycomb-shaped ceramic or metal as the substrate, and the surface of the honeycomb body is coated with Al 2 o 3 , rare earth-based materials (CeO 2 , La 2 o 3 Mixed oxide with other metal oxides) and a small amount of platinum group metals (platinum, palladium, rhodium) three components of the active co...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B7/00C22B11/00C22B59/00
CPCC22B1/06C22B7/007C22B7/009C22B11/048C22B59/00Y02P10/20
Inventor 董海刚赵家春童伟锋吴晓峰吴跃东李博捷杨海琼王亚雄保思敏
Owner KUNMING INST OF PRECIOUS METALS
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