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Method for recovering palladium from palladium-contained catalyst

A palladium catalyst and recovery method technology, applied in the direction of improving process efficiency, etc., can solve the problems of toxic and harmful gases, low leaching rate, large acid mist, etc., and achieve the effect of increasing leaching rate, high extraction rate and low cost

Inactive Publication Date: 2018-07-17
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0007] Aiming at the problems that a large amount of black smoke is produced in the process of recovering palladium from scrap catalysts used in the production of hydrogen peroxide, and the generation of toxic and harmful gases, large acid mist, high material consumption and low leaching rate during palladium extraction, the present invention provides a method for recovering palladium in palladium-containing catalysts, Recovering Organic Matter and Improving the Recovery Rate of Metal Palladium by Low Temperature Distillation Pretreatment

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  • Method for recovering palladium from palladium-contained catalyst

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Effect test

Embodiment 1

[0027] The spent palladium-containing catalyst was distilled at 150°C for 10 h to remove organic matter such as anthraquinone. Prepare a palladium leaching solution. The concentration of each component in the leaching solution is: hydrochloric acid 8mol / L, hydrogen peroxide 100g / L, and the spent catalyst after removing organic matter is stirred and heated to 50°C in the leaching solution for oxidative complexation for 0.5h to obtain a palladium-containing solution (i.e. palladium-containing leachate). The palladium-containing solution was reduced with formic acid to obtain elemental palladium powder. During the process of obtaining elemental palladium by formic acid reduction, the volume ratio of formic acid to solution was controlled to be 20:1, the reduction temperature was 60°C, and the reaction was 2 hours. The recovery rate of palladium could reach 97.5%. After using sodium hydroxide to adjust the pH of the tail liquid to 7, it can be recycled.

Embodiment 2

[0029] The spent palladium-containing catalyst was distilled at 160°C for 9.5h to remove organic matter such as anthraquinone. Prepare a palladium leaching solution, the concentration of each component in the leaching solution is: hydrochloric acid 8mol / L, sodium chloride concentration 1mol / L, hydrogen peroxide 100g / L, and the spent catalyst after removal of organic matter is stirred and heated to 55°C in the leaching solution to oxidize and complex After 0.5h, a palladium-containing solution (ie palladium-containing leaching solution) was obtained. The palladium-containing solution was reduced with formic acid to obtain elemental palladium powder. In the process of obtaining elemental palladium by formic acid reduction, the volume ratio of formic acid to solution was controlled to be 20:1, the reduction temperature was 63°C, and the reaction was 2 hours. The recovery rate of palladium could reach 99.5%. After using sodium hydroxide to adjust the pH of the tail liquid to 7, it...

Embodiment 3

[0031] The spent palladium-containing catalyst was distilled at 170°C for 9h to remove organic matter such as anthraquinone. Prepare a palladium leaching solution, the concentration of each component in the leaching solution is: hydrochloric acid 7.5mol / L, sodium chloride concentration 1mol / L, hydrogen peroxide 95g / L, the waste catalyst after removing organic matter is stirred and heated to 55°C in the leaching solution to oxidize the complex combined for 0.8h to obtain a palladium-containing solution (that is, a palladium-containing leaching solution). The palladium-containing solution is reduced with formic acid to obtain elemental palladium powder. During the process of obtaining elemental palladium by formic acid reduction, the volume ratio of formic acid to solution is controlled to be 18:1, the reduction temperature is 65°C, and the reaction is 1.8 hours. The recovery rate of palladium can reach 98.6%. . After using sodium hydroxide to adjust the pH of the tail liquid t...

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Abstract

The invention mainly belongs to the technical field of waste recycling, and relates to a method for recovering palladium from palladium-contained catalyst. The method comprises the following steps: firstly, organic matters in the palladium-contained catalyst are separated and recovered through low-temperature distillation (150-350 DEG C); then, palladium is oxidized and leached by H2O2 in HCl+NaClsolution; and finally, simple substance palladium is obtained through reduction of formic acid. The method prevents environmental pollution caused by direct incineration, realizes recovery of anthraquinone organic matters, meanwhile, has the advantages of high palladium leaching rate, tail liquid recycling, greenness, environmental protection and the like, and is suitable for industrial application.

Description

technical field [0001] The invention mainly belongs to the technical field of waste resource recovery precious metal extraction, and relates to a method for recovering palladium in a palladium-containing catalyst, in particular to a method for recovering palladium from a scrap catalyst used for producing hydrogen peroxide by an anthraquinone method. Background technique [0002] Hydrogen peroxide is an important chemical product, mainly used as oxidizing agent, bleaching agent, disinfectant, deoxidizer and crosslinking agent, widely used in papermaking, food, textile, metallurgy, chemical synthesis and other fields. Hydrogen peroxide is a green chemical product that does not produce secondary pollution and has a large market demand. According to incomplete statistics, the annual production of hydrogen peroxide in my country has exceeded 5 million tons (calculated at a concentration of 27.5%), of which more than 90% of hydrogen peroxide is synthesized by anthraquinone method....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/007C22B11/048Y02P10/20
Inventor 张深根丁云集刘波
Owner UNIV OF SCI & TECH BEIJING
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