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Method for making cementitious material by flue gas desulfurization and denitrification

A technology for desulfurization, denitrification and cementitious materials, which is applied in the field of flue gas desulfurization and denitrification to manufacture cementitious materials to achieve the effects of high-efficiency desulfurization, denitrification and recycling.

Inactive Publication Date: 2018-01-16
ZHONGJING ECO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, there is still no technology for synchronously treating flue gas desulfurization and denitrification, and wastewater solid waste to prepare cementitious materials.

Method used

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  • Method for making cementitious material by flue gas desulfurization and denitrification

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0046] Add the desulfurization and denitration agent to the alkaline wastewater to make a slurry containing the desulfurization and denitrification agent, and send it to the desulfurization and denitrification tower. The flue gas (with an oxygen content of 18vol%) enters the desulfurization and denitrification tower from the flue gas inlet of the desulfurization and denitrification tower. After passing through three absorption spray layers, the sulfur dioxide and nitrogen oxides in the flue gas are fully absorbed by the slurry containing desulfurization and denitrification agents. The resulting flue gas is directly discharged through the chimney after demisting.

[0047] The absorption product formed after the slurry containing desulfurization and denitrification agent absorbs sulfur dioxide and nitrogen oxides is concentrated by a three-effect evaporator, cooled and crystallized, centrifuged and dried to obtain a dry product. The working conditions of flue gas desulfurization...

Embodiment 1

[0053] Dry product, steel slag (specific surface area is 500m 2 / kg), 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.

[0054] Table 3, gelling material formula

[0055] Specification

dry product

Slag

fly ash

magnesium oxide

additive

kg

40

25

25

9

1

[0056] Table 4. Properties of cementitious materials

[0057]

Embodiment 2

[0059] Except adopting the prescription of Table 5, all the other conditions are identical with embodiment 1. See Table 6 for performance test results.

[0060] Table 5, gelling material formula

[0061] Specification

dry product

Slag

fly ash

magnesium oxide

additive

kg

30

20

30

18

2

[0062] Table 6. Properties of cementitious materials

[0063]

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Abstract

The invention discloses a method for making a cementitious material by flue gas desulfurization and denitrification. The method comprises the following steps: (1) performing desulfurization and denitrification treatment on flue gas with slurry containing a desulfurization and denitrification agent to form an absorption product, and performing evaporation concentration, cooling crystallization, centrifugal separation and drying on the absorption product to obtain a drying product, wherein the desulfurization and denitrification agent is prepared from 35 to 65 parts by weight of magnesium oxide,25 to 55 parts by weight of carbide slag and 25 to 55 parts by weight of red mud; (2) uniformly mixing the drying product, industrial solid waste, the magnesium oxide and an additive to form the cementitious material, wherein every 100 parts by weight of the cementitious material is prepared from 25 to 50 parts by weight of the drying product, 35 to 60 parts by weight of the industrial solid waste, 5 to 20 parts by weight of the magnesium oxide and 0.5 to 5 parts by weight of the magnesium oxide. Through adoption of the method disclosed by the invention, flue gas desulfurization and denitrification can be realized; meanwhile, an obtained by-product and the industrial solid waste are combined to form the cementitious material, thereby realizing cyclic utilization of the industrial solid waste.

Description

technical field [0001] The invention relates to a method for manufacturing gelling materials through flue gas desulfurization and denitrification. Background technique [0002] As we all know, sulfur dioxide and nitrogen oxides are the most serious pollutants in the atmosphere. In recent years, the number of smoggy cities has increased rapidly, and the main reason is the above-mentioned pollutants. In addition, alkaline wastewater and acid wastewater are more common in industrial wastewater. If they are discharged directly without treatment, they will corrode pipes, channels and hydraulic structures; after they are discharged into the water body, they will change the pH value of the water body and affect the self-purification of the water body. , Destroying the natural ecology of the river, leading to the reduction or destruction of aquatic resources; infiltration into the soil will cause salinization of the soil, destroy the loose state of the soil layer, and affect the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/73B01D53/80B01D53/60
Inventor 童裳慧
Owner ZHONGJING ECO IND CO LTD
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