A method and application of recovering and preparing titanium-tungsten powder from waste scr denitrification catalyst

A denitrification catalyst and waste catalyst technology, applied in the direction of improving process efficiency, etc., can solve the problems of high cost and complicated recycling process, and achieve the effect of easy operation, simple process, and closed-circuit recycling

Active Publication Date: 2021-03-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the waste SCR denitrification catalyst whose physical structure has been broken and cannot be regenerated, the present invention provides a method for recycling the waste SCR denitration catalyst to prepare titanium-tungsten powder, which solves the problems of complicated and high-cost recovery process of the existing waste catalyst. The titanium-tungsten powder product prepared by the method can completely replace fresh titanium-tungsten powder and return it to the SCR catalyst production process, realizing the recycling of spent catalyst

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  • A method and application of recovering and preparing titanium-tungsten powder from waste scr denitrification catalyst
  • A method and application of recovering and preparing titanium-tungsten powder from waste scr denitrification catalyst
  • A method and application of recovering and preparing titanium-tungsten powder from waste scr denitrification catalyst

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Embodiment 1

[0054] This embodiment provides a method for recovering and preparing titanium-tungsten powder from a waste SCR denitration catalyst, the process flow of the method is as follows figure 1 As shown, the method includes the following steps:

[0055] (1) After the waste SCR denitration catalyst is screened, it is added to dilute sulfuric acid with a mass fraction of 0.5 wt%, soaked under ultrasonic conditions, dried and ground to obtain a pretreated spent catalyst powder, the pretreated spent catalyst powder The particle size of the body is 100 mesh;

[0056] (2) Use sulfuric acid with a concentration of 70wt%, 170°C and mechanical stirring to activate the spent catalyst powder obtained in step (1) for 180min. After the reaction, cool down to 120°C and dilute with water under stirring to obtain rough activation slurry, the mass ratio of pure sulfuric acid contained in the sulfuric acid to the pretreated spent catalyst powder is 4:1, and the mass ratio of the dilution water to th...

Embodiment 2

[0065] This embodiment provides a method for recovering and preparing titanium-tungsten powder from a waste SCR denitration catalyst, the method comprising the following steps:

[0066] (1) After the waste SCR denitrification catalyst is screened, it is added to dilute sulfuric acid with a mass fraction of 5wt%, soaked under ultrasonic conditions, dried and ground to obtain a pretreated spent catalyst powder, the pretreated spent catalyst powder The particle size is 200 mesh;

[0067] (2) Use sulfuric acid with a concentration of 80wt%, 150°C and mechanical stirring to activate the pretreated spent catalyst powder obtained in step (1) for 10 minutes. After the reaction, cool down to 90°C and dilute with water under stirring to obtain rough activated slurry, the mass ratio of the pure sulfuric acid contained in the sulfuric acid to the pretreated spent catalyst powder is 3:1, and the mass ratio of the dilution water to the pretreated spent catalyst powder is 10:1 ;

[0068] (...

Embodiment 3

[0076] This embodiment provides a method for recovering and preparing titanium-tungsten powder from a waste SCR denitration catalyst, the method comprising the following steps:

[0077] (1) After the waste SCR denitrification catalyst is screened, it is added to dilute sulfuric acid with a mass fraction of 10wt%, soaked under ultrasonic conditions, dried and ground to obtain a pretreated spent catalyst powder, the pretreated spent catalyst powder The particle size is 300 mesh;

[0078] (2) Use sulfuric acid with a concentration of 85wt%, 140°C and mechanical stirring to activate the spent catalyst powder obtained in step (1) for 30 minutes. After the reaction, cool down to 100°C and dilute with water under stirring to obtain rough activated slurry, the mass ratio of pure sulfuric acid contained in the sulfuric acid to the pretreated spent catalyst powder is 2:1, and the mass ratio of the dilution water to the pretreated spent catalyst powder is 8:1 ;

[0079] (3) 400 purpose...

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Abstract

The invention relates to a method for preparing titanium tungsten powder by recycling waste SCR denitration catalyst. The method comprises the following steps that the waste SCR denitration catalyst is pretreated so as to obtain pretreated waste catalyst powder; activated treatment is carried on the pretreated waste catalyst powder by using sulfuric acid, and after the waste catalyst powder is cooled and diluted, crude activated slurry is obtained; glass fibers are removed in the crude activated slurry to obtain purified and activated slurry; the activated slurry is heated and purified to obtain a reconstructed slurry; the reconstructed slurry is filtered so as to obtain a solid-phase product and a filtrate; and solid-phase products are sequentially washed, dried and calcined to obtain titanium-tungsten powder products. According to the method, the waste SCR denitration catalyst is converted into the titanium tungsten powder, and the whole process is simple in process, so that the process complexity caused by the step of extracting Ti and W metal components step by step is avoided, the cost is high, the recovery rate of Ti and W exceeds 97%, and the obtained titanium tungsten powder products meet the requirements of industry indexes can completely replace fresh titanium tungsten powder, and are used for production of the SCR catalyst.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a catalyst recycling method, in particular to a method and application of a waste SCR denitration catalyst recycling to prepare titanium tungsten powder. Background technique [0002] The amount of waste SCR denitrification catalysts produced in my country is about 200,000 m3 3 / year, 2016 has been included in hazardous waste management. Its main components include 80-85wt% TiO 2 , 0.5%~1.5wt%V 2 o 5 , 5 ~ 10wt% WO 3 , and SiO 2 、Al 2 o 3 and other structural auxiliary components. Realizing the recycling of waste SCR denitrification catalysts will not only have significant economic benefits in the recovery of valuable resources, but will also significantly reduce the production cost of SCR denitrification catalysts. [0003] For waste SCR denitrification catalysts, two types of technologies are currently used for treatment, namely, direct regeneration technology and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/12C22B34/36
CPCC22B7/007C22B34/125C22B34/365Y02P10/20
Inventor 王兴瑞李会泉王晨晔陈艳赵晨
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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