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Method for extracting and separating metallic oxide from flue gas denitration catalyst

A denitration catalyst and metal separation technology, applied in titanium oxide/hydroxide, chemical instruments and methods, vanadium oxide, etc., can solve the problems of secondary pollution of the environment, affecting the operating cost of the SCR system, etc. Economic benefits and the effect of improving quality

Active Publication Date: 2017-01-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discarding of the catalyst directly affects the operating cost of the SCR system, and the metal components vanadium, tungsten and titanium will pollute the environment again

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Raw material pretreatment: Firstly, the waste denitrification catalyst is purged with compressed air, washed with bubbling water, and then dried in an oven at 110°C for 8 hours;

[0039] Pulverization and roasting: Physically pulverize the dried waste denitrification catalyst to a particle size of ≤100 mesh, then take the catalyst powder and roast it at a high temperature at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours ;

[0040] Acid leaching: Add dilute sulfuric acid at a constant temperature of 60°C to the catalyst after high-temperature roasting for leaching. The concentration of dilute sulfuric acid is 10%, and the volume is 3 times that of the reactant; solid phase and filtrate;

[0041] Acid hydrolysis: Add 87% concentrated sulfuric acid to the solid phase obtained from the separation of the leaching material and stir. The mass ratio of concentrated sulfuric acid to waste denitration cata...

Embodiment 2

[0049] Raw material pretreatment: first, the waste denitrification catalyst is purged with compressed air, washed with bubbling water, and then dried in an oven at 110°C for 10 hours;

[0050] Pulverization and roasting: Physically pulverize the dried waste denitrification catalyst to a particle size of ≤100 mesh, then take the catalyst powder and roast it at a high temperature at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours ;

[0051] Acid leaching: Add dilute sulfuric acid at a constant temperature of 60°C to the catalyst after high-temperature roasting for leaching. The concentration of dilute sulfuric acid is 10%, and the volume is 4 times that of the reactant; solid phase and filtrate;

[0052] Acid hydrolysis: add 87% concentrated sulfuric acid to the solid phase obtained from the separation of the extract and stir, the mass ratio of concentrated sulfuric acid to waste denitration catalyst is 2.3...

Embodiment 3

[0060] Raw material pretreatment: first, the waste denitrification catalyst is purged with compressed air, washed with bubbling water, and then dried in an oven at 110°C for 10 hours;

[0061] Pulverization and roasting: Physically pulverize the dried waste denitrification catalyst to a particle size of ≤100 mesh, then take the catalyst powder and roast it at a high temperature at 650°C to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours ;

[0062] Acid leaching: Add dilute sulfuric acid at a constant temperature of 60°C to the catalyst after high-temperature roasting for leaching. The concentration of dilute sulfuric acid is 10%, and the volume is 4 times that of the reactant; solid phase and filtrate;

[0063] Acid hydrolysis: Add 90% concentrated sulfuric acid to the solid phase obtained from the separation of the leachate and stir, the mass ratio of concentrated sulfuric acid to waste denitration catalyst is 2....

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PUM

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Abstract

The invention relates to a waste recycling method, and particularly relates to a method for extracting and separating metallic oxide from a flue gas denitration catalyst. The method comprises the following steps: sequentially performing physical pretreatment, pulverization and high-temperature roasting on the flue gas denitration catalyst, then performing leaching by use of dilute acid, and further performing acidolysis treatment by use of concentrated sulfuric acid; aging reactants obtained after acidolysis treatment, performing filtration, then performing boiling hydrolytic treatment on a filtrate so that titanium dioxide is subjected to hydrolytic precipitation, and performing solid-phase separation on liquid obtained by leaching, regulating the pH of the obtained filtrate to 2.0-2.5 by use of aqueous ammonia, then performing organic extraction, and further performing back extraction by use of dilute sulphuric acid; oxidizing vanadium in strip liquor from quadrivalence to quinquevalence by use of sodium chlorate; then adding aqueous ammonia to regulate the pH to 1.9-2.2, and performing precipitation separation on vanadium in an ammonium metavanadate form; and performing pyrolysis on a precipitate, thereby obtaining vanadic oxide. The method provided by the invention has the advantages of simple process, high recovery efficiency, good product technical index and the like.

Description

technical field [0001] The invention relates to a method for reusing waste, in particular to a method for extracting and separating metal oxides from flue gas denitrification catalysts. Background technique [0002] Nitrogen oxides are one of the most important air pollutants today, which can cause a series of environmental problems such as acid rain. With the development of the economy, the emission of nitrogen oxides is increasing, and it is becoming more and more urgent to strictly control the emission of nitrogen oxides. In 2012, my country's NO X With an emission of 23.378 million tons, it is the world's largest NOX emitter, and it has also become the focus of my country's "Twelfth Five-Year Plan" emission control. Among its control technologies, the Selective Catalytic Reduction (SCR) technology using ammonia as a reducing agent occupies a large market due to its maturity and reliability. Among them, V 2 o 5 -WO 3 / TiO 2 The type catalyst is the most widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G31/02
CPCC01G23/0475C01G31/02C01P2006/80
Inventor 高翔郑成航岑可法倪明江骆仲泱宋浩吴卫红余鸿敏王承志竺新波周劲松
Owner ZHEJIANG UNIV
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