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Method for recycling waste SCR denitration catalyst

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

Active Publication Date: 2016-06-15
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 denitration catalysts, which can convert economically valuable elements in waste SCR denitration catalysts into recyclable titanium dioxide and tungsten-containing compounds, thereby turning waste into treasure and solving the problem of Conventional waste SCR denitrification catalysts are landfilled to deal with problems such as waste of resources and pollution of the environment, which has high economic and social benefits

Method used

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  • Method for recycling waste SCR denitration catalyst
  • Method for recycling waste SCR denitration catalyst

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Embodiment 1

[0036] Such as figure 1 As shown, embodiment one provides a kind of method for recycling waste SCR denitration catalyst, comprising steps:

[0037] 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 ;

[0038] S12: crystallize and centrifuge the first filtrate to obtain a second product, the second product includes Na 2 WO 4 .

Embodiment 2

[0040] Such as figure 2 As shown, the method for recycling the waste SCR denitration catalyst in embodiment two comprises the following steps:

[0041] S21: Perform pretreatment and physical and chemical cleaning on the waste SCR denitration catalyst in sequence; specifically, after deashing 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 When the thickness is 50 μm, it is more conducive to the subsequent treatment of the SCR denitration catalyst;

[0042] 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 ;

[0043] S23: crystallize and centrifuge the first filtrate to obtain a second product, the second product includes Na 2 WO 4 .

Embodiment 3

[0045] Such as image 3 As shown, the method for recycling the waste SCR denitration catalyst in embodiment three comprises steps:

[0046] S31: Mix the waste SCR denitrification catalyst with a strong base to perform a substitution reaction, perform a first pressure filtration after the reaction, and perform a second pressure filtration on the first product obtained by the first pressure filtration to obtain a third products, the third product includes TiO 2 , mixing the filtrate obtained by press filtration for the second time with the first filtrate obtained by press filtration for the first time to obtain a second filtrate;

[0047] S32: crystallize and centrifuge the second filtrate to obtain a fourth product, the fourth product includes Na 2 WO 4 .

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Abstract

The invention discloses a method for recycling a waste SCR denitration catalyst. The method comprises the following steps: mixing a waste SCR denitration catalyst and strong base to carry out a substitution reaction, and carrying out first filter-pressing after the reaction to obtain a first product containing TiO2 and a first filtrate; crystallizing the first filtrate and centrifuging to obtain a second product containing Na2WO4; and carrying out secondary filter-pressing on the first product after the first filter-pressing, mixing a liquid obtained after the secondary filter-pressing and the first filtrate to obtain a second filtrate, crystallizing the second filtrate and centrifuging so as to more effectively recycle the waste SCR denitration catalyst. By the method for recycling the waste SCR denitration catalyst, elements with economic value in the waste SCR denitration catalyst can be effectively converted to recyclable compounds. Thus, waste is changed into valuable things, and problems of land waste and environmental pollution due to conventional landfill treatment are solved. The method 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 waste SCR denitration catalysts. 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 (Selective Catalytic Reduction, SCR) is a relatively mature denitrification technology. 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 mast...

Claims

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Application Information

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IPC IPC(8): C01G41/00C01G23/053
CPCY02P20/584C01G41/00C01G23/053
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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