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Method for recycling and circulating production of waste SCR denitration catalyst

A denitrification catalyst and catalyst technology, applied in the direction of improving process efficiency, can solve problems such as rising costs, poor bargaining power of buyers, unfavorable cost control, etc., and achieve the effect of shortening the process flow

Inactive Publication Date: 2019-03-29
孙昕 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, both ammonium metavanadate and ammonium metatungstate need to be added in a certain way in the SCR catalyst production and SCR catalyst regeneration process as the active material precursor required for catalyst production or the active carrier liquid required for catalyst regeneration; while the existing V, The supply of W is mainly concentrated in enterprises in a few provinces. Long-distance transportation is required to increase costs, and buyers have poor bargaining power, which is not conducive to cost control.

Method used

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  • Method for recycling and circulating production of waste SCR denitration catalyst
  • Method for recycling and circulating production of waste SCR denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take 500g of discarded SCR catalyst, remove, crush, and grind it into a 60-micron powder, add it to 3.5L NaOH solution with a concentration of 1.0mol / L, control the leaching temperature at 80°C, and leaching time for 0.5h. The pressure is controlled at 0.5MPa, the frequency of ultrasonic waves is controlled at 50kHz, and then liquid-solid separation is carried out. Vanadium, tungsten and other impurities enter the liquid in the form of ions, and the pH value of the filtrate is adjusted between 8.5 and 10.5. After stirring fully, let it stand for 6 hours. Liquid-solid separation and impurity removal. Use a strong basic large channel anion exchange resin to adsorb vanadium and tungsten ions, and then add a mixed solution of ammonia water and ammonium chloride for desorption, in which NH 4 The concentration of Cl is 4mol / L, NH 4 The concentration of OH is 2mol / L, and the desorption temperature is 50°C; the desorption liquid is crystallized, and the crystallization tempera...

Embodiment 2

[0030] Take 500g of discarded SCR catalyst, remove, crush, and grind it into a 60-micron powder, add it to 3.5L NaOH solution with a concentration of 1.0mol / L, control the leaching temperature at 80°C, and leaching time for 0.5h. The pressure is controlled at 0.5MPa, and the ultrasonic frequency is controlled at 50kHz. Then carry out liquid-solid separation, vanadium, tungsten and other impurities enter the liquid in the form of ions, adjust the pH value of the filtrate between 8.5 and 10.5, stir fully and let it stand for 5 hours, liquid-solid separation and removal of impurities. Use a strong basic large channel anion exchange resin to adsorb vanadium and tungsten ions, and then add a mixed solution of ammonia water and ammonium chloride for desorption, in which NH 4 The concentration of Cl is 5mol / L, NH 4 The concentration of OH is 1mol / L, and the desorption temperature is 50°C; the desorption liquid is crystallized, and the crystallization temperature is 90°C. 62.4 g of ...

Embodiment 3

[0032]Take 500g of discarded SCR catalyst, remove, crush, and grind it into a 60-micron powder, add it to 3.5L NaOH solution with a concentration of 1.0mol / L, control the leaching temperature at 80°C, the leaching time is 1h, and the leaching pressure Controlled at 0.5MPa, ultrasonic frequency controlled at 50kHz. Then carry out liquid-solid separation, vanadium, tungsten and other impurities enter the liquid in the form of ions, adjust the pH value of the filtrate between 8.5 and 10.5, stir fully and let it stand for 4 hours, liquid-solid separation and removal of impurities. Use a strong basic large channel anion exchange resin to adsorb vanadium and tungsten ions, and then add a mixed solution of ammonia water and ammonium chloride for desorption, in which NH 4 The concentration of Cl is 5mol / L, NH 4 The concentration of OH is 1mol / L, and the desorption temperature is 60°C; the desorption solution is crystallized, and the crystallization temperature is 90°C. 60.4 g of obt...

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Abstract

The invention discloses a method for recycling and circulating production of a waste SCR denitration catalyst. According to the method, the resources of vanadium, tungsten and titanium in the waste SCR denitration catalyst are recycled and used as raw materials for producing SCR denitration catalyst or for SCR denitration catalyst active regenerating, so that the goal of forming a recycling industrial chain is achieved. The method comprises the following procedures of performing pretreating, crushing, grinding, ultrasonic enhanced alkali leaching, liquid-solid separating, impurity removing, ion exchanging, desorbing, and evaporating crystallizing of the waste SCR denitration catalyst, and then the new SCR catalyst is obtained by circulating production.

Description

technical field [0001] The invention belongs to the field of resource recovery and reuse, and in particular relates to a method for recovery and reuse of waste SCR denitrification catalysts. technical background [0002] The content of tungsten and molybdenum in the waste SCR denitrification catalyst even exceeds the content of tungsten and molybdenum in domestic tungsten and molybdenum mines by several times. TiO 2 , V 2 o 5 、WO 3 The recycling of waste SCR catalysts can reduce the secondary pollution of waste SCR catalysts and avoid the waste of resources. It is the preferred method for the treatment of waste SCR denitrification catalysts. [0003] At the same time, both ammonium metavanadate and ammonium metatungstate need to be added in a certain way in the SCR catalyst production and SCR catalyst regeneration process as the active material precursor required for catalyst production or the active carrier liquid required for catalyst regeneration; while the existing V...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/36
CPCC22B7/008C22B34/225C22B34/365Y02P10/20
Inventor 孙昕刘现卓
Owner 孙昕
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