硅酸盐通报2025，Vol.44Issue(8)：2762-2770,9.DOI:10.16552/j.cnki.issn1001-1625.2025.0104
低钙高镁石灰石制备固碳熟料及其碳酸化硬化机理
Preparation of Carbonation-Bonded Clinker from Low-Calcium High-Magnesium Limestone and Its Carbonation-Hardening Mechanism
摘要
Abstract
To tackle the issues of raw material constraints and carbon emissions in traditional Portland cement production,a new type of low-calcium and high-magnesium cement clinker was prepared using low-calcium and high-magnesium limestone(MgO mass fraction greater than 5％)and sandstone as raw materials.The main minerals of this clinker are bredigite(Ca7MgSi4O16,C7MS4),larnite(β-Ca2SiO4,β-C2S),periclase(MgO)and merwinite(Ca3MgSi2O8,C3MS2).By substituting raw materials,the consumption of limestone is reduced,and the high reactivity of magnesium minerals is utilized to realize the CO2 mineralization curing technology for concrete.The research results show that this clinker system is formed at 1 220～1 260 ℃.After calcination,grinding and molding,and carbonation for 24 h under the conditions of a CO2 purity of 99.9％(volume fraction)and a pressure of 0.3 MPa,the compressive strength can reach 90.2 MPa,and the carbon sequestration rate is as high as 9.22％.This technology offers a dual-emission-reduction solution of"source carbon reduction-process carbon sequestration"for the cement industry.It not only cuts down the limestone usage but also effectively sequesters CO2,providing a new technological route for the green and low-carbon transformation of the cement industry.关键词
低钙硅酸盐胶凝材料/碳酸化养护/胶凝材料组成/烧成制度/高镁石灰石/力学性能Key words
low-calcium silicate cementitious material/carbonation curing/composition of cementitious materials/sintering system/high-magnesium limestone/mechanical property分类
建筑与水利引用本文复制引用
朱建平,曹佳楠,王祚麟,李根深,刘松辉,郑波,冯春花..低钙高镁石灰石制备固碳熟料及其碳酸化硬化机理[J].硅酸盐通报,2025,44(8):2762-2770,9.基金项目
全国建材行业重大科技攻关"揭榜挂帅"项目(2021JBGS03-11) （2021JBGS03-11）
