Waste incineration flue gas denitration catalyst and preparation method thereof

A denitration catalyst and waste incineration technology, applied in the field of denitration catalyst, can solve the problems of resource waste, secondary pollution, ecological environment threat, etc., and achieve the effects of avoiding secondary synthesis, improving removal effect, and achieving standard treatment and discharge.

Pending Publication Date: 2022-03-25
SHANDONG SCICOM ECOLOGICAL ENVIRONMENT RES INST CO LTD +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Dioxins generally exist in the form of particles, aerosols or gases. Part of the dioxins can be removed in the dust removal process (such as using a high-efficiency bag filter). However, in the selective catalytic reduction denitrification process, if the process temperature is high, such as Above 300°C (the formation temperature of dioxin is about 300-700°C), dioxin will be produced again, causing secondary pollution
[0004] Red mud is an industrial solid waste produced by the alumina industry. At present, the cumulative stock of red mud in the world has exceeded 4 billion tons, and the comprehensive utilization rate of red mud in the world does not exceed 10%. The waste of resources is also harmful to the ecology. The environment poses a potentially serious threat

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  • Waste incineration flue gas denitration catalyst and preparation method thereof
  • Waste incineration flue gas denitration catalyst and preparation method thereof

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preparation example Construction

[0016] In a first aspect, the present invention provides a waste incineration flue gas denitration catalyst prepared by the preparation method, which includes α-Fe 2 O 3 and γ-Fe 2 O 3 , where α-Fe 2 O 3 with γ-Fe 2 O 3 The mass ratio of 0.3-1:9-9.7.

[0017] In some embodiments, in the denitration catalyst, α-Fe 2 O 3 with γ-Fe 2 O 3 The mass ratio of 0.3-0.7:9.3-9.7.

[0018] Further, in the denitration catalyst, α-Fe 2 O 3 with γ-Fe 2 O 3 The mass ratio of 0.5:9.5.

[0019] Within the range of the above mass ratio, when the temperature of the flue gas of the incineration waste to be treated is lower than 300°C for catalytic denitrification, better denitration efficiency and dioxin removal efficiency can be obtained. , due to the low denitration temperature, on the one hand, it can prevent the resynthesis of dioxins, so that the dioxins can be discharged up to the standard; Catalytic denitration is carried out after the secondary heating. If the catalytic de...

Embodiment 1

[0039] 5%α-Fe 2 O 3 / 95%γ-Fe 2 O 3 Preparation of denitration catalyst active ingredient combination:

[0040] 1) Weigh 10g of the extracted iron oxide, wash with deionized water until the pH value is 7.0;

[0041] 2) Step 1) wet ball milling of gained material, pass through 200 mesh sieve;

[0042] 3) Step 2) the material obtained is placed in an oven and dried at 110°C until the quality no longer changes;

[0043]4) Step 3) The obtained material is placed in a tube furnace and calcined at 580° C. for 3 hours to obtain the combination of active components of the denitration catalyst. The atmosphere conditions are: H in the mixed gas 2 3vol%, N 2 Accounted for 97vol%, the pressure of the secondary pressure reducing valve at the mixed gas outlet was set to 2bar, and the gas flow rate was 20mL / min.

Embodiment 2

[0045] 10%α-Fe 2 O 3 / 90%γ-Fe 2 O 3 Preparation of denitration catalyst active ingredient combination:

[0046] 1) Weigh 10g of the extracted iron oxide, wash with deionized water until the pH value is 7.0;

[0047] 2) Step 1) wet ball milling of gained material, pass through 200 mesh sieve;

[0048] 3) Step 2) the material obtained is placed in an oven and dried at 110°C until the quality no longer changes;

[0049] 4) In step 3), the obtained material was placed in a tube furnace and calcined at 580° C. for 2.8 hours to obtain the combination of active components of the denitration catalyst. The atmosphere conditions are: H in the mixed gas 2 2vol%, N 2 Accounted for 98vol%, the pressure of the secondary pressure reducing valve at the mixed gas outlet was set to 2bar, and the gas flow rate was 20mL / min.

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Abstract

The invention discloses a waste incineration flue gas denitration catalyst and a preparation method thereof, the waste incineration flue gas denitration catalyst comprises alpha-Fe2O3 and gamma-Fe2O3, and the mass ratio of alpha-Fe2O3 to gamma-Fe2O3 is (0.3-1): (9-9.7). The preparation method comprises the following steps: extracting alpha-Fe2O3 from the red mud; the extracted alpha-Fe2O3 is subjected to ball milling and sieving and then calcined in a reducing atmosphere, the calcination temperature is 500-600 DEG C, calcination time is set, and the catalyst is obtained.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a waste incineration flue gas denitration catalyst and a preparation method thereof. Background technique [0002] The statements herein merely provide background related to the present invention and do not necessarily constitute prior art. [0003] Waste incineration flue gas mainly includes HCl, SO x , NO x The existing waste incineration flue gas treatment process generally includes the following steps: selective non-catalytic reduction denitrification, high temperature dust removal, selective catalytic reduction denitrification, and low temperature deacidification and whitening. Dioxins generally exist in the form of granules, aerosols or gases, and some dioxins can be removed in the dust removal process (such as using a high-efficiency bag filter), but in the selective catalytic reduction and denitration process, if the process temperature is high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/00B01J37/08B01J37/18B01D53/86B01D53/56
CPCB01J23/745B01J37/0036B01J37/08B01J37/18B01D53/8628B01D2257/404B01D2258/0291
Inventor 张涛朱英李静田超张伟屹邵艳秋邵莹莹李书慧
Owner SHANDONG SCICOM ECOLOGICAL ENVIRONMENT RES INST CO LTD
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