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A kind of extraction agent and palladium recovery method for the recovery of industrial waste palladium catalyst

A technology of extraction agent and catalyst, which is applied in the field of utilization of industrial waste catalyst resources and extraction and separation, can solve the problems of complex recycling process, high content of product elements, high cost of raw materials, etc., and achieve improved dissolution rate, high palladium selectivity, and low cost Effect

Inactive Publication Date: 2020-11-03
河南能源集团研究总院有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing waste palladium catalyst recovery process, such as complex process, serious corrosion, large environmental pollution, high raw material cost, and high content of impurity elements such as sulfur and nitrogen in the product, and provide a palladium recovery catalyst that can be used for industrial waste palladium catalysts. Palladium recovery method with lower cost, stable properties, recyclable extractant and product recovery rate, and higher product quality

Method used

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  • A kind of extraction agent and palladium recovery method for the recovery of industrial waste palladium catalyst
  • A kind of extraction agent and palladium recovery method for the recovery of industrial waste palladium catalyst

Examples

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Embodiment 1

[0023] A kind of extraction agent that is used for industrial waste palladium catalyst recovery, it comprises following four kinds of components: extraction medium, phase adjustment agent, promoter and solvent, its volume ratio is (0.5~20):(0.5~3):( 0~20): (57~99); the extraction medium is one or more combinations of sulfur-containing or phosphorus-containing organic ligand compounds, and the phase regulator is one or two of phosphate compounds. The accelerator is one or a combination of two or more of benzene homologues, and the solvent is one or a combination of two or more organic solvents.

[0024] The extraction medium in the extractant is one or more combinations of sulfur-containing or phosphorus-containing organic ligand compounds, which have the effect of selectively complexing divalent palladium, wherein the sulfur-containing organic ligand compounds include diethoxy di Thioether organic ligand compounds, diphenyl sulfide, diphenyl disulfide, etc., diethoxydisulfide ...

Embodiment 2

[0035] (1) Use a graduated cylinder to measure 66.3 mL of hydrochloric acid solution with a mass concentration of 37% and 40.8 mL of hydrogen peroxide with a mass concentration of 30%, slowly add a certain amount of deionized water under stirring conditions, and then add 10.7 g of ammonium chloride to prepare into a 400mL solution (the concentration of hydrochloric acid in the leaching solution is 2 mol / L, the concentration of hydrogen peroxide is 1 mol / L, and the concentration of ammonium chloride is 0.5 mol / L); After immersion for 48 hours, about 400 mL of reddish-brown palladium leachate was obtained, the main composition of which is shown in Table 1.

[0036] (2) Measure 2 mL of 1,2-bis(2-hydroxyethylthio)-4-toluene, 2 mL of tributyl phosphate, and 40 mL of xylene respectively with a measuring cylinder, add it to a certain amount of aviation kerosene, and stir Mix evenly, prepare 400 mL extractant and put it in a 1000 mL beaker.

[0037] (3) Slowly add the palladium leach...

Embodiment 3

[0040] (1) Use a graduated cylinder to measure 132.6 mL of hydrochloric acid solution with a mass concentration of 37% and 81.6 mL of hydrogen peroxide with a mass concentration of 30%, slowly add a certain amount of deionized water under stirring conditions, and then add 21.4 g of ammonium chloride to prepare 400 mL of the solution (the concentration of hydrochloric acid in the leaching solution is 4 mol / L, the concentration of hydrogen peroxide is 2 mol / L, and the concentration of ammonium chloride is 1 mol / L), and then added to the Erlenmeyer flask containing 200 g of spent palladium catalyst. Put the above-mentioned Erlenmeyer flask containing the spent palladium catalyst and the leaching solution into an ultrasonic oscillator filled with water for 15 minutes, then let it stand for 1 hour and then filter and separate to obtain about 400 mL of palladium leaching solution; the composition of the palladium leaching solution is mainly The composition is shown in Table 1.

[00...

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Abstract

An extraction agent for recycling industrial waste palladium catalyst comprises the four ingredients of an extraction medium, a phase conditioning agent, an accelerant and a solvent, wherein the volume ratio of the extraction medium, the phase conditioning agent, the accelerant and the solvent is (0.5-20): (0.5-3): (0-20): (57-99). The extraction medium is one or a combination of two or more of organic ligand compounds containing sulfur or phosphorous, the phase conditioning agent is one or a combination of two or more of phosphate compounds, and the accelerant is one or a combination of two or more of benzene homologue, and the solvent is one or a combination of two or more of organic solvents. The extraction agent has quite high palladium selectivity, a provided palladium recycling method is short in process, the extraction agent is low in corrosivity and does not contain sulfur, the content of the nitrogen is smaller than 10 ppm, the purity of palladium is high, and the defects thata traditional refining process needs the complicated steps of repeated acid dissolution, sedimentation and reduction, the contents of sulfur, nitrogen and metal impurity elements in the obtained palladium powder are high, the product purity is low and the like are overcome.

Description

technical field [0001] The invention belongs to the technical field of utilization of industrial waste catalyst resources and extraction and separation, and in particular relates to an extraction agent and a palladium recovery method for recovery of industrial waste palladium catalysts. Background technique [0002] As a precious metal with unique physical and chemical properties, metal palladium is widely used in industrial catalysis, automobile exhaust purification, aerospace, microelectronics technology and metallurgical industry and other fields. Due to the scarcity and high cost of palladium element, recovery of palladium from industrial waste palladium catalyst and metal palladium has important economic and social benefits. Alumina-supported palladium catalysts are widely used in petroleum, chemical and pharmaceutical industries, and the recovery of palladium from spent catalysts with alumina as a carrier is attracting increasing attention. At present, relevant resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C22B3/40C22B3/38
CPCY02P10/20
Inventor 宋军超崔发科穆仕芳张鲁湘丁蕊魏灵朝蒋元力
Owner 河南能源集团研究总院有限公司
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