Method for preparing carbon sequestration carbide slag cement-based material based on three-section curing mode

Through the three-stage maintenance method, the calcium carbide slag is pretreated and the step-by-step stirring and mixing technology is adopted, combined with pre-curing, carbon curing and standard maintenance processes, the problems of low carbon sequestration efficiency and insufficient mechanical properties in the existing technology are solved, efficient CO2 capture and sequestration are achieved, and the mechanical properties of cement-based materials are improved.

CN119874302AActive Publication Date: 2025-04-25INNER MONGOLIA UNIV OF TECH
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Patent Information

Application Number
CN202510387094.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-31
Publication Date
2025-04-25
Estimated Expiration
2045-03-31

AI Technical Summary

Technical Problem

In the prior art, CO2 has a low diffusion rate in cement particles, resulting in a low carbon sequestration efficiency. At the same time, the addition of calcium carbide slag has a negative impact on the mechanical properties of cement-based materials, resulting in strength loss.

Method used

The cement-based materials of carbon-solid calcium carbide slag are prepared based on three-stage curing methods, including pretreatment of calcium carbide slag, step-by-step stirring and mixing, and three-stage curing processes (pre-curing, carbon curing and standard curing).

Benefits of technology

The carbon sequestration efficiency and mechanical properties are improved, the compressive strength can reach 45.1MPa and the flexural strength can reach 4.5MPa. The degree of carbon solidification and carbon sequestration rate are significantly improved, achieving effective capture and sequestration of CO2.

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Abstract

The invention relates to a method for preparing a carbon sequestration carbide slag cement-based material based on a three-section curing mode, which comprises the following steps of: utilizing pretreated carbide slag, regulating and controlling the mixing sequence of the carbide slag, cement and water, adopting the three-section curing mode of'pre-curing + carbon curing + standard curing ', and optimizing factors such as the doping amount of the carbide slag, the water-binder ratio, the curing time and the like, so as to prepare the carbon sequestration carbide slag cement-based material. The carbon sequestration carbide slag cement-based material with good carbon sequestration efficiency and excellent mechanical properties is obtained. Wherein the carbide slag is used as a reinforced carbon sequestration material, so that the problems that the diffusion rate of CO2 in cement particles is low and the content of carbon-curable substances in a matrix is low are solved, the carbon sequestration efficiency of the CO2-cured cement-based material is improved, and the mechanical property of the product is greatly improved by CaCO3 generated by reaction. The compressive strength of the obtained material can reach 45.1 MPa, the breaking strength can reach 4.5 MPa, the carbon curing degree can reach 84.57%, and the carbon sequestration rate is 62.06%.
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Citation Information

Patent Citations

  • Calcium carbide slag powder and application thereof

    CN101037202A

  • Method for preparing carbonized brick from wet-milling carbide slag

    CN111875332A

  • Lightweight carbide slag cement-based material and preparation method thereof

    CN118184392A

  • Solid brick prepared from solid waste of power plant and preparation method of solid brick

    CN118561561A

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