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Red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent and preparation method thereof

A technology for desulfurization, denitrification, and low-temperature flue gas, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., and can solve the urgent problems of acid waste gas emission control

Pending Publication Date: 2020-04-10
MCC ENERGY SAVING & ENVIRONMENTAL PROTECTION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it is very urgent to control the emission of acidic waste gas in flue gas

Method used

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  • Red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent and preparation method thereof
  • Red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent and preparation method thereof

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preparation example Construction

[0070] like figure 1 Shown, the present invention relates to a kind of preparation method of red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent, described method comprises the following steps:

[0071] Step (1): Weigh a certain amount of red mud, fly ash and granular quicklime respectively, dry the red mud at 105°C-110°C for 3-5 hours, grind the granular quicklime and flyash separately, and Sieve to 50-150 mesh and set aside; among them, the mass ratio of red mud, fly ash and quicklime is preferably: 7:2:1-5:4:1;

[0072] In step (2), put the spare red mud, fly ash and quicklime in the step (1) into the container, preferably a beaker or a mixer in the above mass ratio, stir and mix well, and after the raw materials are completely reacted and formed, put The sample is transferred to a heating furnace, preferably a muffle furnace or a roasting furnace, calcined at 200-350°C for 2-5 hours, then taken out and cooled;

[0073] Step (3): ...

Embodiment 1

[0082] Weigh a certain amount of red mud, fly ash and granular quicklime respectively, dry the red mud at 105°C-110°C for 5 hours, grind the granular quicklime and flyash separately, and sieve to 50-150 mesh The mass ratio of red mud, fly ash and unslaked lime is: 7:2:1; According to this ratio, add three kinds of raw materials in the beaker, seal, fully mix and stir, after the raw materials react completely and form, transfer the sample to the beaker. After calcining at 200-350°C for 3 hours in a Furnace, take it out to cool, crush, grind, and then sieve with a 200-300-mesh sampling sieve to obtain the final absorbent sample.

[0083] Simultaneous desulfurization and denitrification performance evaluation of red mud fly ash absorbent: put the treated red mud fly ash system absorbent into fixed bed reactor 20 (the fixed bed reactor is made of quartz glass, with an inner diameter of 10 mm, and the absorbent is accumulated Height is 15mm), first use inert gas N 2 After purging ...

Embodiment 2

[0085] Weigh a certain amount of red mud, fly ash and granular quicklime respectively, dry the red mud at 105°C-110°C for 4 hours, grind the granular quicklime and flyash separately, and sieve to 50-150 mesh ; The mass ratio of red mud, fly ash and quicklime is: 6:3:1; according to this ratio, add a certain amount of three kinds of raw materials into the mixer, fully mix and stir, and after the raw materials are completely reacted and formed, transfer the sample to put into a roasting furnace, calcined at 300°C for 4 hours, cooled, crushed, ground, and then sieved with a sampling sieve with a mesh size of 150-250 mesh to obtain the final absorbent sample.

[0086] The red mud fly ash system absorbent was applied to the 3×220t / h boiler flue gas ultra-low emission renovation project of Nantun Electric Power Branch of Yankuang Group Co., Ltd. Entrance SO 2 The concentration is 800mg / Nm 3 , the inlet NOx concentration is 200mg / Nm 3 . The flue gas temperature is 150°C and the f...

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Abstract

The invention discloses a red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent and a preparation method thereof. The red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent is mainly prepared by mixing and stirring solid waste fly ash, red mud and quick lime according to a certain proportion, and after series reaction molding is performed, the calcining, cooling, crushing and sieving are performed to prepare the absorbent. Solid waste the red mud and the fly ash are used as main raw materials of the absorbent, low-temperature flue gas can be desulfurized and denitrified at the same time, and the removal efficiency is high. Meanwhile, the absorbent provided by the invention is strong in alkalinity, rich in raw material source, easy to purchase and low in cost, and the treatment of wastes with wastes is achieved. The preparation process of the absorbent is simple, the wastes are turned into wealth, meanwhile,the absorbent absorbing acid waste gas in flue gas can be further recycled, secondary pollution is avoided, and the absorbent is suitable for industrial application and popularization.

Description

technical field [0001] The invention relates to a red mud fly ash system low-temperature flue gas desulfurization and denitrification absorbent and a preparation method thereof, which is suitable for the purification of acidic waste gas in flue gas discharged from different sections of industries such as boiler flue gas, steel, electric power, and petroleum and petrochemical industries The process belongs to the field of industrial waste gas treatment and solid waste resource utilization. Background technique [0002] In recent years, sulfur and nitrogen compounds in industrial coal combustion flue gas are the main air pollutants in my country. In order to control the emission of sulfur and nitrogen compounds in flue gas, the Chinese government has also issued a series of policies, including issuing new emission standards, raising the emission concentration requirements of thermal power plants, boilers and various furnaces; formulating various Technical specifications and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/82B01D53/68B01D53/62B01D53/56B01D53/52B01D53/50
CPCB01D53/508B01D53/523B01D53/565B01D53/62B01D53/68B01D53/82B01D2251/304B01D2251/306B01D2251/402B01D2251/404B01D2257/204B01D2257/2045B01D2257/2047B01D2257/302B01D2257/304B01D2257/504B01D2258/0283
Inventor 李鹏飞李惊涛赵晓燕朱晓华王广春朱迎新董源
Owner MCC ENERGY SAVING & ENVIRONMENTAL PROTECTION
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