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Method directly using acid and alkaline activation of red mud to prepare iron type denitrifying catalyst

A denitrification catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve a wide range of industrial application prospects, meet industrial needs, and reduce costs.

Inactive Publication Date: 2018-01-05
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention not only solves the problem of red mud treatment, but also reduces the cost of existing flue gas denitrification, and achieves the purpose of treating waste with waste

Method used

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  • Method directly using acid and alkaline activation of red mud to prepare iron type denitrifying catalyst
  • Method directly using acid and alkaline activation of red mud to prepare iron type denitrifying catalyst
  • Method directly using acid and alkaline activation of red mud to prepare iron type denitrifying catalyst

Examples

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Effect test

Embodiment 1

[0049] This embodiment provides a method for preparing an iron-based denitration catalyst from red mud, and the specific method is as follows:

[0050] (1) To 1kg of red mud (Fe in red mud 2 o 3 After adding 3kg of waste hydrochloric acid (concentration: 20%) to the mass fraction of 35%, it was reacted at 80° C. for 10 h to obtain a uniform first slurry with a solid content of 25% and a pH of 2;

[0051] (2) adding ammonia water (the mass fraction of ammonia in the ammonia water is 10%) successively to the first slurry, the pH value of the solution is about 9, the silica-alumina sol precipitates again, the viscosity of the system becomes smaller, and the second slurry is obtained;

[0052] (3) After the second slurry is subjected to solid-liquid separation and washing, it is dried at 100° C., and then calcined at 600° C. for 5 hours to obtain a solid substance, which is an iron-titanium-silicon-aluminum oxide denitration catalyst. The water phase obtained by solid-liquid sep...

Embodiment 2

[0059] This embodiment provides a method for preparing an iron-based denitration catalyst from red mud, and the specific method is as follows:

[0060] (1) To 1kg of red mud (Fe in red mud 2 o 3 After adding 10 kg of waste sulfuric acid (concentration 40%) into the mass fraction of 45%, it was reacted at 120° C. for 10 h to obtain a uniform first slurry, and the pH of the first slurry was 0.5;

[0061] (2) slowly successively ammonium carbonate powder in the first slurry, control solution terminal pH value is about 6, obtains the second slurry;

[0062] (3) After the second slurry is subjected to solid-liquid separation and washing, it is dried at 100° C., and then calcined at 500° C. for 10 hours to obtain a solid substance, that is, an iron-titanium-silicon-aluminum oxide denitration catalyst.

[0063] The specific surface area of ​​the iron-titanium-silicon-aluminum oxide denitration catalyst obtained in this example is 190m 2 / g, the strength is 4.5Mpa, and the composit...

Embodiment 3

[0068] This embodiment provides a method for preparing an iron-based denitration catalyst from red mud, and the specific method is as follows:

[0069] (1) To 1kg of red mud (Fe in red mud 2 o 3 After adding 1kg of waste phosphoric acid (concentration: 10%) to 10% by mass fraction), it was reacted at 70°C for 20h to obtain a uniform first slurry, and the pH of the first slurry was 0;

[0070] (2) slowly successive ammonium carbonate powder in the first slurry, control solution terminal pH value is about 5, obtains the second slurry;

[0071] (3) After the second slurry is subjected to solid-liquid separation and washing by plate and frame filter press, it is dried at 100°C, and then roasted at 400°C for 20 hours to obtain a solid substance, which is an iron-titanium-silicon-aluminum oxide denitrification catalyst .

[0072] The specific surface area of ​​the iron-titanium-silicon-aluminum oxide denitration catalyst obtained in this example is 150m 2 / g, the strength is 4.5...

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Abstract

The invention provides a method directly using acid and alkaline activation of red mud to prepare an iron type denitrifying catalyst. The method comprises the following steps of (1) adding acid into the red mud, and reacting at the temperature of 70 to 200 DEG C, so as to obtain first slurry, namely acid slurry; (2) adding alkaline matter into the first slurry in step (1), and adjusting the pH (potential of hydrogen) value to 5 to 10, so as to obtain second slurry; (3) separating solid and liquid of the second slurry in step (2), so as to obtain filter cake; roasting the filter cake, so as toobtain an iron, titanium, silicon and aluminum oxide catalyst with denitrifying activity. The method has the advantages that the waste of red mud can be treated in a harmless way, and the waste is changed into the valuable; when the waste of the red mud is directly applied to the denitrifying process of flue gas, the existing denitrifying cost is greatly reduced, and the wide industrial application prospect is realized; the obtained iron, titanium, silicon and aluminum oxide catalyst can be applied into the denitrifying process of the flue gas of fired coal, and be used for replacing the existing vanadium, tungsten and titanium denitrifying catalyst.

Description

technical field [0001] The invention belongs to the field of hazardous solid waste treatment and application in the alumina smelting industry, and relates to a method for preparing an iron-based vanadium-free medium-temperature denitrification catalyst from red mud. Background technique [0002] Red mud is the polluting strong alkaline waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. A large amount of red mud is a strong alkaline substance, which needs to be piled up in a large area of ​​storage yard. While occupying a large amount of land, it must pass through the cement wall to avoid serious pollution to the environment. Most countries have listed red mud as a hazardous waste. The production of red mud has caused direct and indirect impacts on human production and life in many ways. Therefore, the output and hazards of red mud should be minimized to achieve...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01D53/86B01D53/56
Inventor 余剑杨娟李长明刘周恩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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