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Method for recycling vanadium pentoxide in waste SCR (Selective Catalytic Reduction) denitration catalyst

A technology of denitrification catalyst and vanadium pentoxide, which is applied in the field of vanadium pentoxide composition, can solve problems such as waste, and achieve the effects of strong operability, simple process and high purity

Active Publication Date: 2014-12-10
无锡华骏宏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After 2018, about 380 tons of vanadium pentoxide are contained in 38,000 tons of waste SCR catalysts per year. If these components cannot be recycled, it will cause serious waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 has described a kind of method that reclaims the vanadium pentoxide component in the spent SCR denitration catalyst, and its specific steps include:

[0034] (1) Firstly, the raw material waste SCR denitrification catalyst is crushed to a particle size within the range of 100-200 mesh, and high-temperature roasting is carried out at 650°C for 4 hours;

[0035] (2), prepare 10% hydrochloric acid solution 1L, add 7.02g anhydrous sodium sulfite and the 300g dry powder waste SCR denitrification catalyst after roasting in the step (1), the mol ratio of anhydrous sodium sulfate and vanadium pentoxide is 3 : 1, heated and stirred at 70°C for 5h;

[0036] (3), after fully reacting, the solution is suction-filtered to obtain a green upper strata vanadium-containing clear liquid and a lower floor filter residue;

[0037] (4), replace the dry powdery waste SCR denitrification catalyst after roasting in step (1) with filter residue, repeat steps (2) and (3) twice, col...

Embodiment 2

[0042] Embodiment 2 also describes a method of reclaiming the vanadium pentoxide component in the spent SCR denitration catalyst, and its specific steps include:

[0043] (1) Firstly, the raw material waste SCR denitrification catalyst is pulverized to a particle size within the range of 150-300 mesh, and high-temperature roasting is carried out at 700°C for 3 hours;

[0044] (2), prepare 20% acetic acid solution 1.5L, add dry powdery waste SCR denitrification catalyst after roasting in 19.35g ascorbic acid and 400g step (1), the mol ratio of ascorbic acid and vanadium pentoxide is 5: 1, in Heating and stirring at 60°C for 7h;

[0045] (3), after fully reacting, the solution is suction-filtered to obtain a green upper strata vanadium-containing clear liquid and a lower floor filter residue;

[0046] (4), replace the dry powdery waste SCR denitrification catalyst after roasting in the step (1) with the filter residue, repeat the above-mentioned steps (2) and (3) once, collect ...

Embodiment 3

[0051] Embodiment 3 has described another kind of method that reclaims the vanadium pentoxide component in the spent SCR denitration catalyst, and its specific steps include:

[0052] (1) Firstly, the raw material waste SCR denitrification catalyst is pulverized to a particle size within the range of 200-300 mesh, and high-temperature roasting is carried out at 750° C. for 5 hours;

[0053] (2), prepare 1.2L of sulfuric acid solution of 15%, add dry powdery waste SCR denitrification catalyst after roasting in 2.18g sodium borohydride and 300g step (1), the mol ratio of sodium borohydride and vanadium pentoxide is 3.5 : 1, heated and stirred at 80°C for 5h;

[0054] (3), after fully reacting, the solution is suction-filtered to obtain a green upper strata vanadium-containing clear liquid and a lower floor filter residue;

[0055] (4), replace the dry powdery waste SCR denitrification catalyst after roasting in the step (1) with the filter residue, repeat the above-mentioned st...

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Abstract

The invention belongs to the field of non-ferrous metal recycling, and in particular relates to a method for separating and recycling vanadium pentoxide in a waste SCR (Selective Catalytic Reduction) denitration catalyst according to a reduction acid leaching method. The method provided by the invention comprises the following steps: firstly, reducing pentavalent vanadium in the catalyst by using a reducing agent in an acidic solution to tetravalent vanadium which is more soluble, then oxidizing the tetravalent vanadium in the acidic solution to the pentavalent vanadium by using an antioxidant, fully hydrolyzing the pentavalent vanadium under certain conditions for precipitation by adjusting the pH value of the solution, collecting the precipitation, roasting the precipitation and then obtaining the vanadium pentoxide with high purity. The method disclosed by the invention is simple in process, higher in operability, and suitable for large-scale production. The recovery rate of the vanadium pentoxide can be ensured to reach above 95%, and the purity of the obtained vanadium pentoxide is high (higher than 98%), so that the vanadium pentoxide can be directly used for preparing raw materials of the SCR denitration catalyst; the method disclosed by the invention can not only turn wastes into useful resources, and harm into benefits, but also solve a series of potential environmental pollution problems to bring considerable economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, and in particular relates to a method for separating and recovering vanadium pentoxide components in waste SCR denitrification catalysts by means of reducing acid leaching. Background technique [0002] Selective Catalytic Reduction (SCR) denitrification technology is currently the most important flue gas denitrification technology in power plants in my country. According to statistics, by the end of 2015, the total amount of SCR implementation projects completed nationwide will reach 570 million kW. During the use of the catalyst, problems such as catalyst sintering, alkali metal poisoning, ash clogging, and loss of active components may cause damage to the catalyst and eventually lead to catalyst failure. [0003] With the wide application of SCR technology, there will be more and more waste SCR denitrification catalysts. It is estimated that starting from 2014, 12,000 tons of waste S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22
CPCY02P10/20
Inventor 陆强陈晨张阳董长青杨勇平
Owner 无锡华骏宏科技有限公司
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