Method for preparing building material from high-temperature flue gas and alkaline solid waste

A technology of high-temperature flue gas and building materials, applied in the field of building materials, can solve the problems of high pressure required for carbonation reaction, unapplicable concentration, low industrial flue gas, etc., and improve the overall carbon capture efficiency and carbon capture capacity , the overall maintenance period is short, and the effect of promoting contact

Active Publication Date: 2022-06-07
碳达(深圳)新材料技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the existing utilization of alkaline solid waste and CO in industrial flue gas 2 In the technology of preparing building materials, CO cannot be applied 2 Low concentration of industrial flue gas, long excitation and curing time, and high pressure required for carbonation reaction provide a method for preparing building materials using high-temperature flue gas and alkaline solid waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, steel slag is used as an alkaline solid waste raw material, cement is used as an alkali activator, and the CO in the industrial high-temperature flue gas is used. 2 Carbonation reaction occurs to prepare building materials, and the specific operation steps are as follows:

[0051] 1) Mix 80 parts of steel slag, 20 parts of cement, and 18 parts of water, and press the pure slurry under 10MPa pressure after stirring evenly;

[0052] 2) After molding, seal the directly peeled test piece with a plastic film and cure at 40°C for 24 hours;

[0053] 3) After 24 hours, the specimen was placed in a temperature of 70°C and a 10% carbon dioxide concentration environment (55%-65% relative humidity) for further curing for 48 hours; the strength of the specimen after carbonation was 16.5MPa;

[0054] 4) Crush the carbonized specimen, and screen out the particle size range of 0-3mm (fine aggregate) and 3-10mm (coarse aggregate) as the aggregate of concrete prefabrica...

Embodiment 2

[0058] In this example, steel slag is used as an alkaline solid waste raw material, and activated magnesium oxide and calcium hydroxide (slaked lime) are used as an alkali activator in synergy, which is compatible with CO in industrial high-temperature flue gas. 2 Carbonation reaction occurs to prepare building materials, and the specific operation steps are as follows:

[0059] 1) 80 parts of steel slag, 50 parts of active magnesium oxide, 15 parts of calcium hydroxide and 18 parts of water are mixed, and after stirring, the pure slurry is pressed and formed under a pressure of 10MPa;

[0060] 2) After molding, seal the directly peeled test piece with a plastic film and cure at 40°C for 24 hours;

[0061] 3) After 24 hours, the specimen was placed in a temperature of 70°C and a 10% carbon dioxide concentration environment (55%-65% relative humidity) for further curing for 72 hours, and the strength of the specimen at this time was determined to be 21.8MPa;

[0062] 4) Crushi...

Embodiment 3

[0066] In this example, steel slag and fly ash are used as alkaline solid waste raw materials. 2 Carbonation reaction occurs to prepare building materials, and the specific operation steps are as follows:

[0067] 1) Mix water glass, caustic soda and water according to the mass ratio of 5:1:4 and make a liquid activator;

[0068] 2) Mix 40 parts of steel slag, 40 parts of fly ash, 20 parts of auxiliary alkali activator cement and 30 parts of liquid alkali activator evenly, and press the pure slurry under 10MPa pressure after stirring uniformly;

[0069] 3) After molding, seal the directly peeled test piece with a plastic film and cure at 40°C for 24 hours;

[0070] 4) After 24 hours, the test piece was placed in a temperature of 70°C and a 10% carbon dioxide concentration environment (55%-65% relative humidity) for further curing for 72 hours, and the strength of the test piece was determined to be 37.6MPa at this time;

[0071] 5) Crushing the specimen after carbonation, and ...

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Abstract

The invention discloses a method for preparing a building material by using high-temperature flue gas and alkaline solid waste, and aims to overcome the defects that CO2 in industrial flue gas with low CO2 concentration cannot be effectively captured, the overall maintenance time of the material is long, and the pressure required by carbonation reaction is large in the existing technology for preparing the building material by using CO2 in the alkaline solid waste and the industrial flue gas. The method is realized on the basis of carbonation reaction of alkaline solid waste and CO2, and comprises the following steps: 1, exciting and activating, and preparing an active green body; 2, performing primary mineralization; 3, crushing the aggregate; 4, preparing a green body containing mineralized aggregate; 5, secondary mineralization; according to the invention, the alkaline solid waste can be effectively utilized to capture CO2 in the high-temperature flue gas with low CO2 concentration; the high-strength mineralized aggregate is obtained through one-time mineralization, the mineralized aggregate is mixed with the alkaline solid waste and the alkali activator, CO2 in high-temperature flue gas is captured again, the capturing rate of CO2 and the reutilization rate of the alkaline solid waste are effectively increased, and the obtained building material is better in durability.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing building materials by utilizing high-temperature flue gas and alkaline solid waste. Background technique [0002] Industrial flue gas generally uses carbon capture, utilization and storage (CCUS) to reduce carbon emissions. Existing carbon capture technologies include: post-combustion capture, oxy-fuel combustion and pre-combustion capture. These three carbon capture technologies The specific applications are as follows: (i) Post-fuel carbon capture technology must use chemical solvents such as amines to separate CO from flue gas 2 ; (ii) Oxygen-enriched combustion refers to the combustion of fuel in oxygen-enriched recirculated flue gas; (iii) Pre-combustion capture is the partial conversion of hydrocarbon fuels to a mixture of hydrogen and carbon monoxide, which is then used in a water-gas shift reaction to generate fuel for combustion. Hydrogen and CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B28/02C04B28/26C04B28/00C04B40/02
CPCC04B28/105C04B28/02C04B40/0236C04B40/0263C04B28/26C04B28/10C04B28/006C04B2201/50C04B2111/00017C04B18/142C04B18/08C04B18/16C04B7/00C04B22/064C04B22/066C04B22/062Y02W30/91
Inventor 魏振华俞英田张润潇
Owner 碳达(深圳)新材料技术有限责任公司
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