Method for preparing fiber cement products based on flue gas desulfurization and denitrification of red mud

A technology for desulfurization, denitrification, and fiber manufacturing, which is applied in the field of fiber cement products. It can solve the problems of low waste utilization rate, difficult industrial production, and complex components, and achieve the effects of ensuring high-efficiency operation, low price, and overcoming high energy consumption.

Inactive Publication Date: 2018-01-12
中晶蓝实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has complex components, low utilization rate of waste, and difficult industrial production.

Method used

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  • Method for preparing fiber cement products based on flue gas desulfurization and denitrification of red mud
  • Method for preparing fiber cement products based on flue gas desulfurization and denitrification of red mud
  • Method for preparing fiber cement products based on flue gas desulfurization and denitrification of red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] According to the formula in Table 1, mix the components uniformly to obtain a flue gas treatment agent, then add alkaline wastewater to make a flue gas desulfurization and denitrification agent slurry, and send it to the desulfurization tower. The flue gas (oxygen content is 18vol%) enters the desulfurization tower from the flue gas inlet of the desulfurization tower, and undergoes three layers of ozone oxidation (ozone comes from the ozone generator, and the ozone concentration of the ozone generator is 10wt%) and flue gas desulfurization and denitrification agent slurry After absorbing the spray layer, sulfur dioxide and nitrogen oxides are fully absorbed by the flue gas desulfurization and denitrification agent slurry. After the flue gas desulfurization and denitrification agent slurry absorbs sulfur dioxide and nitrogen oxides, it is introduced into the slurry circulation tank in the lower part of the desulfurization tower through the action of gravity. The slurry i...

Embodiment 2

[0071] Using the flue gas treatment agent formula in Table 6, the working conditions of flue gas desulfurization and denitrification are shown in Table 7 and Table 8 below. All the other conditions are the same as in Example 1. See Table 9 for the recipe. See Table 10 for performance test results.

[0072] Table 6 Flue gas treatment agent formula

[0073]

[0074] Table 7 Desulfurization and denitrification working condition parameters

[0075] serial number

project

quantity

unit

1

Flue gas volume at the inlet of desulfurization tower (working condition)

1037075

m 3 / h

2

Standard smoke volume

701364

N m 3 / h

3

Desulfurization tower inlet temperature

140

℃

4

SO2 inlet concentration

980

mg / Nm 3

5

NOx inlet concentration

410

mg / Nm 3

6

Inlet soot

100

mg / Nm 3

7

Flue gas moisture content

5.3

wt%

[0076] Table 8 Emissions fro...

Embodiment 3

[0083] The formulation of the flue gas treatment agent in Table 11 and the working conditions of flue gas desulfurization and denitrification are shown in Table 12 and Table 13 below. All the other conditions are the same as in Example 1. See Table 14 for the recipe. See Table 15 for performance test results.

[0084] Table 11 Flue gas treatment agent formula

[0085]

[0086] Table 12 Desulfurization and denitrification working condition parameters

[0087] serial number

project

quantity

unit

1

Flue gas volume at the inlet of desulfurization tower (working condition)

1092076

m 3 / h

2

Standard smoke volume

741361

N m 3 / h

3

Desulfurization tower inlet temperature

143

℃

4

SO2 inlet concentration

960

mg / Nm 3

5

NOx inlet concentration

392

mg / Nm 3

6

Inlet soot

113

mg / Nm 3

7

Flue gas moisture content

5.8

wt%

[0088] Table 1...

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Abstract

The invention discloses a method for preparing fiber cement products based on flue gas desulfurization and denitrification of red mud. The method comprises the following steps: contacting flue gas desulfurization and denitrification agent slurry and ozone with flue gas; removing sulfur dioxide and nitrogen oxide in the flue gas through a wet process, thereby forming a desulfurization and denitrification side product slurry, wherein the flue gas desulfurization and denitrification agent slurry is the slurry formed by a flue gas treating agent and industrial wastewater and the flue gas treatingagent comprises 50-100 weight parts of red mud, 5-30 weight parts of magnesium oxide and 5-25 weight parts of sodium hydroxide; forming a mixture by mixing the flue gas desulfurization and denitrification agent slurry with magnesium oxide, industrial solid waste, fiber and additive when the pH value of the desulfurization and denitrification side product slurry reaches up to 6.5-7.5; and adoptingthe mixture for preparing a primary blank, curing and drying, thereby acquiring the fiber cement products. According to the method disclosed by the invention, the industrial wastes can be effectivelyutilized on the basis of the flue gas desulfurization and denitrification and the circular economy can be realized.

Description

technical field [0001] The invention relates to a method for manufacturing fiber cement products, in particular to a method for directly using red mud desulfurization and denitrification by-product slurry to manufacture fiber cement products. Background technique [0002] As a kind of lightweight and high-strength building board, fiber cement board has a relatively short development time in our country, but it has developed rapidly in recent years. Because of its characteristics of fire prevention, moisture resistance, durability, and small deformation, it has been widely used in the fields of housing construction and industrial construction. In the field of housing construction, this kind of board is mainly used in indoor partition walls, suspended ceilings, ceilings, ground laying, etc. After special processing and surface coating, it can be used as external wall hanging board or external wall veneer, etc., and can be used for internal and external wall insulation and per...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B111/28
Inventor 童裳慧
Owner 中晶蓝实业集团有限公司
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