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Pretreatment method and system for spent catalyst containing noble metal

A technology for waste catalysts and precious metals, which is applied in the field of pretreatment of waste catalysts, can solve the problems of adverse effects of dust environment and low recovery rate of precious metals, and achieve the effects of favorable extraction rate, large recovery volume and high purity

Active Publication Date: 2021-11-30
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a pretreatment method and system for waste catalysts containing precious metals, aiming to solve the problem that the recovery rate of precious metals in the existing method is low, and the dust generated in the reaction process has adverse effects on the environment

Method used

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  • Pretreatment method and system for spent catalyst containing noble metal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A catalyst containing noble metal Pt, where the weight percentage of Pt in the catalyst is 25%.

[0027] The catalyst particles are ground and mixed with water to form a slurry with a mass concentration of 10%. The slurry storage tank 1 for storing the slurry is stirred, and the particles are placed to settle. The slurry in the slurry storage tank 1 is pressured by the high-pressure diaphragm pump 2. rise to 25MPa, while the liquid oxygen passes through the high-pressure liquid oxygen pump 16 and the vaporizer, the pressure rises to 25MPa, and the slurry and high-pressure oxygen enter the supercritical water oxidation reactor 3 after being mixed at the nozzle. The temperature in the hearth of the reaction furnace was detected and controlled at 680°C.

[0028] The supercritical water oxidation reaction is an exothermic reaction. When it is detected that the reaction temperature exceeds 680°C, cold water is sent to the furnace of the reactor 3 through the high-pressure pu...

Embodiment 2

[0036] A catalyst containing noble metal Pd, where the weight percentage of Pd in ​​the catalyst is 20%.

[0037] The catalyst particles are ground and mixed with water to form a slurry with a mass concentration of 15%. The slurry storage tank 1 for storing the slurry is stirred, and the particles are placed to settle. The slurry in the slurry storage tank 1 is pressured by the high-pressure diaphragm pump 2. The pressure rises to 27MPa, while the liquid oxygen passes through the high-pressure liquid oxygen pump 16 and the vaporizer, and the pressure rises to 27MPa. The slurry and high-pressure oxygen are mixed at the nozzle and then enter the supercritical water oxidation reactor 3. The temperature in the hearth of the reaction furnace was detected and controlled at 600°C.

[0038] The reaction product of the supercritical water oxidation reaction enters the shell of the reactor 3 from the discharge port of the furnace, and the cooling water is sent to the reactor 3 to contro...

Embodiment 3

[0044] A catalyst containing noble metal Rh, wherein Ph accounts for 20% by weight of the catalyst.

[0045] The catalyst particles are ground and mixed with water to form a slurry with a mass concentration of 8%. The slurry storage tank 1 for storing the slurry is stirred, and the particles are placed to settle. The slurry in the slurry storage tank 1 is pressured by the high-pressure diaphragm pump 2. The pressure rises to 26MPa, while the liquid oxygen passes through the high-pressure liquid oxygen pump 16 and the vaporizer, and the pressure rises to 26MPa. The slurry and high-pressure oxygen enter the supercritical water oxidation reactor 3 after being mixed at the nozzle. The temperature in the hearth of the reaction furnace is detected and controlled at 750°C.

[0046] The reaction product of the supercritical water oxidation reaction enters the shell of the reactor 3 from the discharge port of the furnace, and the cooling water is sent to the reactor 3 to control the te...

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Abstract

The invention provides a pretreatment method and system for waste catalysts containing precious metals, which belong to the technical field of waste catalyst treatment. The pretreatment method for waste catalysts containing precious metals pretreats waste catalysts through supercritical water oxidation reaction, supercritical water The reaction product of the oxidation reaction undergoes gas-liquid and solid-liquid separation to extract the ash for extracting precious metals. The pretreatment method can be carried out by a pretreatment system of spent catalysts containing precious metals. The method and system for pretreatment of spent catalysts containing precious metals provided by the present invention increase the extraction amount of ash and slag, which is beneficial to the subsequent improvement of the recovery rate of precious metals, and at the same time, the discharge is cleaner.

Description

technical field [0001] The invention belongs to the technical field of waste catalyst treatment, and more specifically relates to a pretreatment method and system for waste catalysts containing precious metals. Background technique [0002] In the preparation process of the catalyst, in order to ensure its activity, selectivity, toxicity resistance, and service life and other indicators, some precious metals are often added as its active components. Common noble metals include gold (Au), silver (Ag), ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir) and platinum (It), of which platinum group metals (Pt , Pd, Rh) are widely used in hydrogenation, oxidation, dehydrogenation, hydrogenolysis, ammonia synthesis, methanol synthesis, hydrocarbon synthesis, hydroformylation and carbonylation and other catalysts. Although the shape, structure and quantity of some components of the catalyst will change during use, the spent catalyst still contains a considerable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C22B7/00C22B11/00
CPCB09B3/00C22B7/006C22B11/048Y02P10/20
Inventor 赵晓程乐明
Owner ENN ENVIROTECH CO LTD
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