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Method for producing cementing material through flue gas desulfurization and denitrification

A technology for desulfurization, denitrification, and gelling materials, which is applied in the field of gelling materials produced by flue gas desulfurization and denitrification by-products, and can solve problems such as air pollution

Inactive Publication Date: 2018-01-12
ZHONGJING ECO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can solve the problem of air pollution caused by sulfur dioxide and nitrogen oxides

Method used

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  • Method for producing cementing material through flue gas desulfurization and denitrification
  • Method for producing cementing material through flue gas desulfurization and denitrification
  • Method for producing cementing material through flue gas desulfurization and denitrification

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0058]The desulfurization and denitration agent is added to the alkaline wastewater to make a desulfurization and denitrification agent slurry, which is sent to the desulfurization and denitrification tower to absorb sulfur dioxide and nitrogen oxides in the flue gas. The flue gas (with an oxygen content of 18vol%) enters the desulfurization tower from the flue gas inlet of the desulfurization and denitrification tower. After passing through the first absorption spray layer, the temperature of the flue gas is reduced and part of the sulfur dioxide gas is absorbed. Next, the flue gas enters the ozone spray absorption layer, where nitric oxide is oxidized into high-valence nitrogen oxides such as nitrogen dioxide and nitrogen pentoxide, and is absorbed by the slurry sprayed from the second absorption spray layer, while sulfur dioxide Continue to be absorbed in this area. Finally, the remaining small amount of sulfur dioxide and nitrogen oxides in the flue gas is absorbed by the ...

Embodiment 1

[0065] By-products of desulfurization and denitrification, steel slag from steel mills (with a specific surface area of ​​500m 2 / kg), coal-fired boiler fly ash, magnesium oxide and additives were mixed evenly, and stirred for 30 minutes to obtain a cementitious material. See Table 3 for the recipe. See Table 4 for performance test results.

[0066] Table 3, gelling material formula

[0067] Specification

Desulfurization and denitrification by-products

Slag

fly ash

magnesium oxide

additive

kg

40

25

25

9

1

[0068] Table 4. Properties of cementitious materials

[0069]

[0070]

Embodiment 2

[0072] Except adopting the prescription of Table 5, all the other conditions are identical with embodiment 1. See Table 6 for performance test results.

[0073] Table 5, gelling material formula

[0074] Specification

Desulfurization and denitrification by-products

Slag

fly ash

magnesium oxide

additive

kg

30

20

30

18

2

[0075] Table 6. Properties of cementitious materials

[0076]

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Abstract

The invention discloses a method for producing a cementing material through flue gas desulfurization and denitrification. The method comprises the following steps: (1) treating flue gas with ozone anda desulfurization and denitrification agent, thereby forming an absorbing product, and further treating the absorbing product, thereby acquiring a dry desulfurization and denitrification side product; (2) forming the cementing material by mixing the raw materials containing the desulfurization and denitrification side product, solid wastes and magnesium oxide, wherein the desulfurization and denitrification agent contains 30-60 weight parts of magnesium oxide, 20-50 weight parts of red mud and 20-50 weight parts of carbide slag, and the magnesium oxide is selected from at least one of lightlyburned magnesite powder, light burned dolomite powder and analytical pure magnesium oxide. According to the method disclosed by the invention, the atmospheric pollution problem caused by sulfur dioxide and nitrogen oxide, the treatment problem of some wastewater containing acid and alkaline and the recycling problem of solid wastes, such as industrial solid wastes and construction wastes can be solved.

Description

technical field [0001] The present invention relates to a method for producing cementitious materials through flue gas desulfurization and denitrification, in particular to a method for producing cementitious materials based on flue gas desulfurization and denitrification by-products formed by efficient oxidation of mixed-based desulfurization and denitration agents and ozone. A synergistic method integrating gas desulfurization and denitrification and wastewater solid waste treatment. Background technique [0002] Red mud and calcium carbide slag are typical alkaline industrial waste residues, and their components are mainly calcium-based. Due to the large amount of these industrial waste residues and their strong alkalinity, their disposal has always been a difficult problem for the industry. If the above-mentioned alkaline industrial waste can be used as a desulfurizing agent in a wet desulfurization system, it will be possible to use waste to control pollution and great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/11C04B9/20C04B11/28
Inventor 童裳慧
Owner ZHONGJING ECO IND CO LTD
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