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Method for producing lightweight concrete product based on calcium carbide slag desulphurization

A technology of lightweight concrete and manufacturing methods, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as environmental damage and large energy consumption, and achieve high energy consumption, cost reduction, and savings The effect of production line investment

Inactive Publication Date: 2018-02-09
ZHONGJING ECO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes the desulfurization agent composed only of calcium carbide slag, red mud and magnesium oxide for desulfurization, which can solve the current problems of large energy consumption and serious damage to the environment, etc.

Method used

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  • Method for producing lightweight concrete product based on calcium carbide slag desulphurization
  • Method for producing lightweight concrete product based on calcium carbide slag desulphurization
  • Method for producing lightweight concrete product based on calcium carbide slag desulphurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) pulping

[0056] According to the following formula, each component was mixed uniformly to obtain a desulfurizer, and then added to waste water (from a chemical plant, with a pH of 10) to obtain a desulfurizer slurry. The weight ratio of desulfurizer to waste water is 1:9.

[0057] The formula of desulfurizer is as follows:

[0058]

[0059] (2) Desulfurization

[0060] The flue gas and the desulfurizer slurry are reversely contacted to undergo physical and chemical reactions to obtain the absorption slurry. Refer to Table 1 for desulfurization working condition parameters.

[0061] Table 1. Desulfurization working condition parameters

[0062] serial number

parameter

unit

value

1

Inlet flue gas volume (working condition)

m 3 / h

800000

2

Inlet flue gas volume (standard condition)

N m 3 / h

541935

3

Inlet smoke temperature

℃

130

4

SO2 inlet concentration

mg / Nm 3

800

...

Embodiment 2

[0070] A lightweight concrete product was prepared in the same manner as in Example 1 except for the following formulation and procedure.

[0071] The formula of desulfurizer is as follows:

[0072]

[0073] In the mixer, at first 30 parts by weight of fine aggregate, 150 parts by weight of desulfurization slurry, 80 parts by weight of fly ash (main component 50wt% SiO 2 , 25 wt% Al 2 o 3 , 9wt% CaO), 80 parts by weight of construction waste powder and 40 parts by weight of magnesium oxide stirred for 5 minutes, then added 35 parts by weight of coarse aggregate and continued to stir for 10 minutes. The average particle size of all raw materials is less than 20mm.

[0074] The desulfurization effect of Example 2 is shown in Table 2, and the performance test results of the lightweight concrete products of Example 2 are shown in Table 3.

Embodiment 3

[0076] A lightweight concrete product was prepared in the same manner as in Example 1 except for the following formulation and procedure.

[0077] The formula of desulfurizer is as follows:

[0078]

[0079] In the mixer, at first 30 parts by weight of fine aggregate, 140 parts by weight of desulfurization slurry, 40 parts by weight of fly ash (main component 50wt% SiO 2 , 25 wt% Al 2 o 3 , 9wt% CaO), 100 parts by weight of construction waste powder and 60 parts by weight of magnesium oxide were stirred for 5 minutes. Then add 40 parts by weight of coarse aggregate and continue stirring for 10 minutes. The average particle size of all raw materials is less than 20mm.

[0080] The desulfurization effect of Example 3 is shown in Table 2, and the performance test results of the lightweight concrete products of Example 3 are shown in Table 3.

[0081] The flue gas desulfurization statistical table of each embodiment of table 2

[0082] Flue gas parameters

[008...

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Abstract

The invention discloses a method for producing a lightweight concrete product based on calcium carbide slag desulphurization. The method comprises the following steps: adding a desulfurizer composed of calcium carbide slag, magnesium oxide and red mud in alkaline industrial wastewater to prepare a desulfurizer slurry; contacting the desulfurizer slurry and specific flue gas; discharging the slurrywhen the pH value of an absorption slurry reaches a scope of 5.3-6.8 to obtain a desulphurization slurry; sieving a light aggregate by sieves having 5 mm meshes and 10 mm meshes, taking the sieved light aggregate with a size being less than 5 mm as a fine aggregate, and taking the sieved light aggregate with the size being larger than 5 mm and less than 10 mm as a coarse aggregate; mixing the fine aggregate, the desulphurization slurry, magnesium oxide and industrial solid waste, and then adding the coarse aggregate for further mixing to obtain a mixture; moulding the mixture, and maintainingthe mixture to obtain the lightweight concrete product. The method can solve the problem of atmosphere pollution due to sulfur dioxide, and can use the industrial solid waste to obtain the qualifiedlightweight concrete product.

Description

technical field [0001] The invention relates to a method for manufacturing lightweight concrete products, in particular to a method for manufacturing lightweight concrete products based on calcium carbide slag desulfurization slurry and other industrial waste. Background technique [0002] At present, most of the aggregates and cement raw materials in our country need to be obtained by digging mountains and rocks, which has caused a bad situation in which large areas of mountains and forests have been destroyed. However, with the rapid development of the country and the rapid construction of cities, the demand for building materials in construction and transportation industries will not decrease for a long period of time in the future, which will inevitably lead to a deepening contradiction between the shortage of construction raw material sources and the expansion of demand . In the environment where the harmonious development of man and nature is emphasized all over the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B18/06C04B111/40
CPCC04B18/062C04B28/30C04B2111/40C04B2201/20C04B2201/50C04B18/027C04B18/023C04B18/12C04B14/00C04B18/08C04B18/16Y02W30/91
Inventor 童裳慧
Owner ZHONGJING ECO IND CO LTD
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