Method for producing lightweight concrete product by flue gas desulfurization based on red mud

A lightweight concrete and flue gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of environmental pollution, poor biodegradability, and high chemical oxygen demand concentration, to ensure high-efficiency operation, reduce Operating costs, avoiding the effect of high energy consumption

Inactive Publication Date: 2018-03-02
ZHONGJING ECO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industrial wastewater has the characteristics of many types of pollutants, complex components, high concentration of chemical oxygen demand, poor biodegradability, and high toxicity.
If it is not effectively comprehensively controlled, it will cause serious environmental pollution and ecological damage.

Method used

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  • Method for producing lightweight concrete product by flue gas desulfurization based on red mud
  • Method for producing lightweight concrete product by flue gas desulfurization based on red mud
  • Method for producing lightweight concrete product by flue gas desulfurization based on red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] According to the formula in Table 1, mix the components uniformly to obtain a desulfurizer, then add alkaline wastewater to make a desulfurizer slurry, and send it to the desulfurizer. The flue gas (with an oxygen content of 18vol%) enters the desulfurization tower from the flue gas inlet of the desulfurization tower, and after passing through the three absorption spray layers of the desulfurizer slurry, the sulfur dioxide is fully absorbed by the desulfurizer slurry. After absorbing sulfur dioxide, the desulfurizer slurry is introduced into the slurry circulation tank in the lower part of the desulfurization tower by gravity. The slurry in the upper part of the slurry circulation tank in the tower is circulated to the three absorption spray layers, and the circulation volume of the three accounts for 50vt% of the total output. When the pH of the slurry in the lower part of the slurry circulation tank in the tower reaches 7.0, it is discharged as desulfurization slurry....

Embodiment 2

[0076] Table 7 and Table 8 below show the desulfurization agent formula and flue gas desulfurization working conditions in Table 6. All the other conditions are the same as in Example 1. See Table 9 for the recipe. See Table 10 for performance test results.

[0077] Table 6 Desulfurizer formula

[0078]

[0079] Table 7 Desulfurization working condition parameters

[0080] serial number

project

quantity

unit

1

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

492300

m 3 / h

2

Standard smoke volume

316352

N m 3 / h

3

Desulfurization tower inlet temperature

141

℃

4

SO2 inlet concentration

1428

mg / Nm 3

5

Flue gas moisture content

10

wt%

[0081] Table 8 Desulfurization Emissions

[0082] serial number

project

quantity

unit

1

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

3010...

Embodiment 3

[0088]Table 12 and Table 13 below show the desulfurization agent formula and flue gas desulfurization working conditions in Table 11. All the other conditions are the same as in Example 1. See Table 14 for recipes. See Table 15 for performance test results.

[0089] Table 11 Desulfurizer formula

[0090]

[0091] Table 12 Desulfurization working condition parameters

[0092] serial number

project

quantity

unit

1

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

478000

m 3 / h

2

Standard smoke volume

295603

N m 3 / h

3

Desulfurization tower inlet temperature

150

℃

4

SO2 inlet concentration

1500

mg / Nm 3

5

Flue gas moisture content

10

wt%

[0093] Table 13 Desulfurization Emissions

[0094] serial number

project

quantity

unit

1

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

3...

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Abstract

The invention discloses a method for producing a lightweight concrete product by flue gas desulfurization based on red mud. The method comprises the steps: (1) making flue gas desulfurizing agent slurry be in contact with flue gas, and removing sulfur dioxide in the flue gas by using a wet process to form desulfurized slurry, wherein the desulfurizing agent slurry is formed by adding water into adesulfurizing agent, and the desulfurizing agent contains 20-70 parts by weight of red mud, 20-70 parts by weight of carbide slag, 5-40 parts by weight of magnesium oxide and 5-30 parts by weight of sodium hydroxide; (2) when the pH of the desulfurized slurry is reduced to be 6.5-7.5, mixing raw materials containing the desulfurized slurry, magnesium oxide, lightweight aggregates, industrial solidwastes and additives to form a mixed material; and (3) carrying out pouring molding on the mixed material, and carrying out curing to obtain the lightweight concrete product. By using the method disclosed by the invention, industrial wastes can be effectively utilized on the basis of flue gas desulfurization, and the qualified lightweight concrete product can be produced.

Description

technical field [0001] The invention relates to a method for producing lightweight concrete products, in particular to a method for directly using red mud-based flue gas desulfurization slurry to produce lightweight concrete products. Background technique [0002] With the introduction of the policy of restricting the use of clay bricks and encouraging the use of new wall materials, new wall materials have developed rapidly. Due to the light weight, heat preservation, earthquake resistance, fire prevention, sound absorption, sound insulation and other properties of lightweight concrete products, and convenient construction, it has been widely used in my country in recent years and has attracted great attention. [0003] The Chinese patent application CN201410686889.3 discloses a production method of ready-mixed light aggregate concrete insulation material, which is to mix spherical light aggregate, fine aggregate, cement, admixture and admixture evenly to form an insulation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B18/06B01D53/50B01D53/80C04B111/40
CPCB01D53/501B01D53/80B01D2258/0283C04B18/062C04B28/30C04B2111/40C04B2201/20C04B2201/50C04B14/304C04B18/142C04B18/08C04B14/06C04B18/027C04B2103/302Y02W30/91
Inventor 童裳慧
Owner ZHONGJING ECO IND CO LTD
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