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Comprehensive recycling method for waste SCR catalysts

A technology of SCR catalyst and extractant, applied in the field of comprehensive recovery and utilization of waste SCR catalyst, can solve the problems of high energy consumption and increase production cost, and achieve the effects of low energy consumption, reduced recovery cost and high extraction rate

Active Publication Date: 2016-08-10
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid leaching process can separate vanadium and tungsten during the leaching process. However, this process uses roasting-ion exchange method to recover tungsten. The roasting process consumes a lot of energy and increases the production cost.

Method used

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  • Comprehensive recycling method for waste SCR catalysts
  • Comprehensive recycling method for waste SCR catalysts
  • Comprehensive recycling method for waste SCR catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The waste SCR catalyst is mechanically crushed until it passes through a 20-mesh sieve; the crushed waste SCR catalyst is sent to a concentration of 6M H 2 SO 4 In the solution, microwave leaching is carried out at a temperature of 100°C, the microwave power is 1200W, the liquid-solid ratio is 1:1, and the leaching time is 6h; the acid leaching solution and leaching residue are obtained through solid-liquid separation, and the leaching residue is fed into ammonia with a concentration of 25%. In the aqueous solution, microwave leaching is carried out at a temperature of 100°C, the microwave power is 1200W, the liquid-solid ratio is 1:2, and the leaching time is 6h; after solid-liquid separation, the leaching solution containing ammonium paratungstate is obtained, and ammonium paratungstate can be obtained by evaporation and crystallization, and the filter residue is crude TiO 2 Adding acid to the pickling solution to adjust the pH to 10, using 5,8-diethyl-7-hydroxyl-6-do...

Embodiment 2

[0037] Mechanically pulverize the spent SCR catalyst until it passes through a 20-mesh sieve; send the pulverized spent SCR catalyst into H2O with a concentration of 10M 2 SO 4In the solution, microwave leaching was carried out at a temperature of 200°C, the microwave power was 600W, the liquid-solid ratio was 10:1, and the leaching time was 5h; the acid leaching solution and leaching slag were obtained through solid-liquid separation, and the leaching slag was fed into ammonia with a concentration of 10%. In the aqueous solution, microwave leaching is carried out at a temperature of 60°C, the microwave power is 600W, the liquid-solid ratio is 10:1, and the leaching time is 2 hours; after solid-liquid separation, the leaching solution containing ammonium paratungstate is obtained, and ammonium paratungstate can be obtained by evaporation and crystallization, and the filter residue is crude TiO 2 Adding acid to the pickling solution to adjust the pH to 4, using 5,8-diethyl-7-hy...

Embodiment 3

[0042] Carry out mechanical pulverization to waste SCR catalyst, to pass through 20 mesh sieves; Send the waste SCR catalyst after pulverization into the concentration of 5M H 2 SO 4 In the solution, microwave leaching was carried out at a temperature of 110°C, with a microwave power of 800W, a liquid-solid ratio of 20:1, and a leaching time of 4 hours; the acid leaching solution and leaching residue were obtained through solid-liquid separation, and the leaching residue was fed into ammonia with a concentration of 25%. In the aqueous solution, microwave leaching is carried out at a temperature of 90°C, the microwave power is 600W, the liquid-solid ratio is 5:1, and the leaching time is 2 hours; after solid-liquid separation, the leaching solution containing ammonium paratungstate is obtained, and ammonium paratungstate can be obtained by evaporation and crystallization, and the filter residue is crude TiO 2 Adding acid to the pickling solution to adjust the pH to 7, using 5,8...

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Abstract

The invention belongs to the technical field of resource recycling, and discloses a comprehensive recycling method for waste SCR catalysts. The method includes the steps that the waste SCR catalysts are mechanically pulverized and then added into an H2SO4 solution, vanadium is leached out under the microwave effect, and pickle liquor and leaching cinder are obtained after solid-liquid separation; the leaching cinder is delivered into an ammonia water solution, tungsten is leached out under the microwave effect, leach liquor containing ammonium tungstate is obtained after solid-liquid separation, ammonium paratungstate can be obtained after evaporative crystallization, and coarse TiO2 is a filter residue; vanadium is extracted from the pickle liquor through 5,8-diethyl-7-hydroxy-6-dodecanone oxime and trioctylamine, and then reverse extraction is conducted through a sodium hydroxide solution; and the pH value of strip liquor is adjusted to 8-10, ammonium chloride is added for vanadium precipitation, and an ammonium metavanadate product is obtained. By means of the method, the recovery rate of vanadium and tungsten is high, leaching time is short, and the purity of the ammonium metavanadate product is high; the technical process is simple, equipment cost is low, energy consumption is small, and the method is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and reuse, and in particular relates to a method for comprehensive recovery and utilization of spent SCR catalysts. Background technique [0002] In August 2014, the Ministry of Environmental Protection issued the "Notice on Strengthening the Supervision of Waste Flue Gas Denitrification Catalysts" and "Guidelines for the Examination of Hazardous Waste Operation Licenses for Waste Flue Gas Denitrification Catalysts", which clearly defined the use of waste flue gas denitrification catalysts (vanadium and titanium Department) into hazardous waste management, at the same time, the country has very strict management norms for hazardous waste. The recovery and treatment of spent SCR catalyst must be carried out as hazardous waste to avoid secondary pollution to the environment. Therefore, the recycling of spent SCR catalysts is particularly important, not only to achieve the purpose of ratio...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/36
CPCC22B7/007C22B7/008C22B34/225C22B34/365Y02P10/20
Inventor 夏启斌张琛杨晓博吴凡范美玲
Owner SOUTH CHINA UNIV OF TECH
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