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Blast furnace gravity ash-based SCR denitration catalyst as well as preparation method and application thereof

A technology of denitrification catalyst and gravity ash, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of polluting soil and water sources, wasting land resources, ecological impact, etc., and achieve high NOx conversion High efficiency, simple production and high stability

Inactive Publication Date: 2021-10-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Blast furnace gravity ash contains many harmful elements, and direct stacking will pollute soil and water sources
If such a large amount of solid waste is not properly disposed of, it will first waste a lot of land resources, cause serious environmental pollution, and have a huge impact on ecology; secondly, it will cause waste of resources

Method used

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  • Blast furnace gravity ash-based SCR denitration catalyst as well as preparation method and application thereof
  • Blast furnace gravity ash-based SCR denitration catalyst as well as preparation method and application thereof
  • Blast furnace gravity ash-based SCR denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Precursor preparation

[0039] Take a certain amount of blast furnace gravity ash, dry it in a blast oven at 105°C for 24 hours, use a coal mill to crush it into small particles, and use a standard inspection sieve to sieve the particles below 100 mesh for use. Take a certain amount of 100-mesh blast furnace gravity ash and mix with 4.5mol / L nitric acid solution, the liquid-solid ratio is 6:1, then stir in a 90°C water bath, and then perform solid-liquid separation to obtain a solution. The composition of gravity ash is shown in Table 1.

[0040] Table 1 Gravity Ash Composition

[0041]

[0042] The leaching solution was detected by an inductively coupled plasma optical emission spectrometer (ICP-OES, PerkinElmer Optima7000DV), and Table 2 was obtained. It was found that the solution mainly contained Fe 3+ 、Al 3+ , Ca 2+ , Mg 2+ , Zn 2+ Wait.

[0043] Table 2 Extract composition

[0044]

[0045](2) pH adjustment

[0046] Ammonia water was added drop...

Embodiment 2

[0050] (1) Precursor preparation

[0051] Take a certain amount of blast furnace gravity ash, dry it in a blast oven at 105°C for 24 hours, use a coal mill to crush it into small particles, and use a standard inspection sieve to sieve the particles below 100 mesh for use. Take a certain amount of 100-mesh blast furnace gravity ash and mix with 4.5mol / L nitric acid solution, the liquid-solid ratio is 6:1, then stir in a 90°C water bath, and then perform solid-liquid separation to obtain a solution.

[0052] (2) pH adjustment

[0053] Ammonia water was added dropwise to the obtained solution to adjust the pH value to 4.5-5.5 to obtain solid phase precipitation, and then washed several times with deionized water until neutral.

[0054] (3) Drying and calcining.

[0055] The neutral precipitate was dried at 105° C. for 12 h in a blast drying oven to constant weight. Finally, the temperature was raised from room temperature to 450°C at a rate of 5°C / min in a muffle furnace, and ...

Embodiment 3

[0057] (1) Precursor preparation

[0058] Take a certain amount of blast furnace gravity ash, dry it in a blast oven at 105°C for 24 hours, use a coal mill to crush it into small particles, and use a standard inspection sieve to sieve the particles below 100 mesh for use. Take a certain amount of 100-mesh blast furnace gravity ash and mix with 4.5mol / L nitric acid solution, the liquid-solid ratio is 6:1, then stir in a 90°C water bath, and then perform solid-liquid separation to obtain a solution.

[0059] (2) pH adjustment

[0060] Ammonia water was added dropwise to the obtained solution to adjust the pH value to 4.5-5.5 to obtain solid phase precipitation, and then washed several times with deionized water until neutral.

[0061] (3) Drying and calcining.

[0062] The neutral precipitate was dried at 105° C. for 12 h in a blast drying oven to constant weight. Finally, the temperature was raised from room temperature to 500°C at a rate of 5°C / min in a muffle furnace, and ...

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Abstract

The invention relates to a blast furnace gravity ash-based SCR denitration catalyst as well as a preparation method and application thereof. The method comprises the steps of mixing the blast furnace gravity ash with an acid solution, and then carrying out solid-liquid separation to obtain a solution; adding a precipitant into the obtained solution, and adjusting the pH value to obtain a solid-phase precipitate; and washing the obtained solid-phase precipitate, drying, and roasting to obtain the denitration catalyst. The active ingredients in the gravity ash are uniformly distributed and recombined through an acidolysis recombination method, so that the denitration catalyst with high activity is prepared.

Description

technical field [0001] The invention belongs to the technical field of gas pollutant removal and environmental protection, and specifically relates to a blast furnace gravity ash-based SCR denitrification catalyst, a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, selective catalytic reduction of ammonia (NH 3 -SCR) technology has been recognized as the most mature and effective NO x Emission reduction technology, adopted by most coal-fired power plants, in which SCR catalyst is the key. V 2 o 5 -WO 3 / TiO 2 The catalyst has become the mainstream commercial SCR catalyst due to its high denitrification performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J35/10B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01J23/80B01J23/002B01J37/031B01J37/082B01D53/8628B01D2258/0283B01D2257/404B01J2523/00B01J35/613B01J35/615B01J35/633B01J35/647B01J2523/22B01J2523/23B01J2523/27B01J2523/31B01J2523/842
Inventor 牛胜利周文波路春美韩奎华李英杰王永征程世庆赵建立
Owner SHANDONG UNIV
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