A kind of recycling method of waste SCR denitration catalyst

A denitration catalyst, physical and chemical technology, applied in the field of recycling waste SCR denitration catalyst, can solve the problems of environmental pollution, waste of resources, etc., achieve high economic and social benefits, and solve the effect of wasting land

Active Publication Date: 2018-06-01
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recycling waste SCR denitrification catalysts, which can convert economically valuable elements in waste SCR denitration catalysts into recyclable titanium dioxide, vanadium-containing compounds and tungsten-containing compounds, thereby turning waste into treasure At the same time, it solves the problems of wasting resources and polluting the environment in the landfill of conventional waste SCR denitrification catalysts, and has high economic and social benefits

Method used

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  • A kind of recycling method of waste SCR denitration catalyst
  • A kind of recycling method of waste SCR denitration catalyst
  • A kind of recycling method of waste SCR denitration catalyst

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Embodiment 1

[0041] Such as figure 1 As shown, embodiment one provides a kind of recycling method of waste SCR denitrification catalyst, comprises steps:

[0042] S11: Mix the waste SCR denitrification catalyst with a strong base for substitution reaction. After the reaction is completed, perform the first pressure filtration to obtain the first product and the first filtrate. The first product includes TiO 2 ;

[0043] S12: add (NH 4 )HCO 3 Carry out precipitation reaction, carry out pressure filtration for the second time again after reaction, obtain the second product and the second filtrate, the second product comprises NH 4 VO 3 ;

[0044] S13: crystallize and centrifuge the second filtrate to obtain a third product, which includes Na 2 WO 4 .

[0045] Wherein, in step S12, add (NH4 )HCO 3 Carry out precipitation reaction, main reaction is:

[0046] NaVO 3 +(NH 4 )HCO 3 =NH 4 VO 3 ↓+NaHCO 3

Embodiment 2

[0048] Such as figure 2 As shown, the recycling method of the waste SCR denitration catalyst in embodiment two comprises the following steps:

[0049] S21: Perform pretreatment and physical and chemical cleaning on the waste SCR denitration catalyst in sequence. Specifically, after pretreatment and physical and chemical cleaning of the SCR denitration catalyst, the particle size of the SCR denitration catalyst is 45-55 μm, and when the particle size of the SCR denitration catalyst is 50 μm, it is more conducive to the subsequent treatment of the SCR denitration catalyst;

[0050] S22: Mix the waste SCR denitrification catalyst with a strong base for substitution reaction. After the reaction is completed, perform the first pressure filtration to obtain the first product and the first filtrate. The first product includes TiO 2 ;

[0051] S23: add (NH 4 )HCO 3 Carry out precipitation reaction, carry out pressure filtration for the second time again after reaction, obtain the...

Embodiment 3

[0055] Such as image 3 As shown, the difference between embodiment three and embodiment one is that the recycling method of the waste SCR denitration catalyst in embodiment three comprises steps:

[0056] S31: Mix the waste SCR denitrification catalyst with a strong base for a substitution reaction. After the reaction is completed, perform the first pressure filtration, and perform another pressure filtration on the first product obtained by the first pressure filtration to obtain the fourth product, the fourth product Including TiO 2 , mixing the filtrate obtained by the two press filtrations in this step to obtain the first composite filtrate;

[0057] S32: Add (NH 4 )HCO 3 Carry out a precipitation reaction, and then perform another pressure filtration after the reaction is completed, and perform another pressure filtration on the filter residue obtained by the pressure filtration again to obtain a fifth product, which includes NH 4 VO 3 , mixing the filtrates obtaine...

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Abstract

The invention discloses a recycling method for a waste SCR denitrification catalyst, which comprises the steps of: mixing the waste SCR denitration catalyst with a strong base for a substitution reaction, and performing a first pressure filtration after the reaction to obtain a first product and a first filtrate, The first product comprises TiO2; Add (NH4)HCO3 in the first filtrate Carry out precipitation reaction, carry out pressure filtration for the second time again after completion of the reaction, obtain the second product and the second filtrate, the second product comprises NH4VO3; To the second filtrate Crystallization and centrifugation are carried out to obtain the third product, which includes Na2WO4. The recycling method of the waste SCR denitration catalyst of the present invention can effectively convert the economically valuable elements in the waste SCR denitration catalyst into recyclable compounds by treating the waste SCR denitration catalyst with chemical and physical methods, turning waste into treasure, and solving the problem of It solves the problem of wasting land and polluting the environment by conventional landfill, and has high economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of catalyst recovery, in particular to a method for recycling a waste SCR denitration catalyst. Background technique [0002] In recent years, air pollution has become increasingly serious, and nitrogen oxides are one of the main factors causing air pollution. Therefore, how to effectively control the emission of nitrogen oxides has become a hot research field. [0003] Selective Catalytic Reduction (SCR) is a relatively mature denitrification technology at present. The selective catalytic reduction method refers to the use of a reducing agent (such as NH 3 , liquid nitrogen, urea) selectively react with nitrogen oxides and generate N 2 and H 2 O. At present, SCR denitrification technology has become the most widely used and most effective denitrification technology in the world, and its denitrification efficiency can reach more than 90%. [0004] At present, my country has fully mastered the production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047C01G31/00C01G41/00C01D7/02
CPCY02P20/584
Inventor 李丁辉任英杰封雅芬蒋慧张伟
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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