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Material for selectively adsorbing palladium and preparation method and application thereof

A selective, silica technology, applied in the direction of chemical instruments and methods, other chemical processes, process efficiency improvement, etc., can solve the complex synthesis process of adsorbents, safety problems and environmental pollution, ion exchange resin poisoning and other problems, Achieve the effect of improving the easy loss of the extractant, improving the impregnation efficiency and easy regeneration

Active Publication Date: 2021-01-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent extraction method: The extraction agent used is expensive, and there is loss during the extraction process. Because it is a flammable, explosive and toxic substance, it will also cause safety problems and environmental pollution
Ion exchange method: The ion exchange method has poor selectivity and is easily polluted by harmful impurities, resulting in ion exchange resin poisoning and short service life
Adsorption method: The synthesis process of existing adsorbents is complicated and the preparation cost is high, so the industrialization is limited to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0038] The material of the present embodiment selectively adsorbing palladium is made by the following method:

[0039] (1) Wash the matrix macroporous silica spherical particles and hydrochloric acid solution at a volume ratio of 1:5 for 4 hours, and filter to obtain macroporous silica spherical particles with surface impurities removed; the mass concentration of the hydrochloric acid solution is 30 %;

[0040] (2) The macroporous silica spherical particles, the palladium extractant 2,5-bis-hexylthio-1,3,4-thiadiazole, and the solvent anhydrous diethyl ether in a volume ratio of 1:5:5 The ratio is mixed evenly, the mixture is placed in an ultrasonic container, and the ultrasonic power is 150W, and the temperature is 20 ℃, ultrasonic impregnation for 5 minutes, and the spherical silica filled with palladium extractant in the pores is obtained;

[0041] (3) Place the spherical silica filled with the palladium extractant in the hole in an aqueous solution with a mass fraction o...

preparation Embodiment 2

[0054] The material of the present embodiment selectively adsorbing palladium is made by the following method:

[0055] (1) Wash the matrix macroporous silica spherical particles and hydrochloric acid solution at a ratio of 1:5 by volume for 4.5 h, and filter to obtain macroporous spherical silica particles with surface impurities removed; the mass concentration of hydrochloric acid solution is 28% ;

[0056] (2) Mix the macroporous silica spherical particles with the palladium extractant 2-hexylthio-5-methyl-1,3,4-thiadiazole and diethyl ether in a volume ratio of 1:5:5 , place the mixture in an ultrasonic container, and ultrasonically impregnate for 5 min under the conditions of ultrasonic power of 150 W and temperature of 20°C; obtain spherical silica filled with palladium extractant in the pores;

[0057] (3) Place the spherical silica filled with palladium extractant in the pores in a solution with a mass fraction of 3.0% polyvinyl alcohol, and soak it at 30 °C for 24 h;...

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Abstract

The invention relates to a material for selectively adsorbing palladium and a preparation method and application thereof. The material for selectively adsorbing palladium is prepared by the followingmethod: taking macroporous silicon dioxide spherical particles as a matrix, filling holes of the matrix with a palladium extracting agent in an ultrasonic impregnation manner, and then taking a polyvinyl alcohol solution as a coating film source; soaking the coated impregnated macroporous silicon dioxide in a cross-linking agent solution to crosslink polyvinyl alcohol to form coated spherical silicon dioxide, performing solid-liquid separation, repeatedly heating and cooling the coated spherical silicon dioxide to vitrify a polyvinyl alcohol coating film, thereby obtaining the material for selectively adsorbing palladium. The preparation method of the coated spherical silicon dioxide is low in cost, short in process and environment-friendly. The method can be used for high-efficiency selective enrichment of palladium in a high-acidity and low-concentration palladium-containing solution, and effectively solves the problems of long flow, low recovery rate, extraction agent loss and the like in the existing process for recovering palladium in copper anode mud by a wet method.

Description

technical field [0001] The present invention relates to a functional adsorption material and its preparation method and application, in particular to a material for selectively adsorbing palladium and its preparation method, as well as the use of the material for selectively adsorbing palladium to select from palladium concentrate chlorinated leachate method for recovering palladium. Background technique [0002] Palladium has excellent physical and chemical properties, and is one of the indispensable key materials in high-tech fields such as aerospace, aviation, navigation, weapons and nuclear energy, as well as in the automobile manufacturing industry. With the continuous development of science and technology, the application of palladium and its alloy materials is also expanding, and the market demand for palladium has soared. Copper anode slime is one of the main sources of palladium. Due to the low content of palladium in copper anode slime, the wet recovery process is...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C22B7/00C22B11/00
CPCB01J20/103B01J20/267B01J20/28019C22B7/005C22B11/042Y02P10/20
Inventor 郭学益马钟琛许志鹏李栋田庆华邹铭金
Owner CENT SOUTH UNIV