钙硅比对硅酸钙矿相烧结行为和固碳能力的影响

doi:10.16552/j.cnki.issn1001-1625.2024.0797

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (1): 297-304.DOI: 10.16552/j.cnki.issn1001-1625.2024.0797

钙硅比对硅酸钙矿相烧结行为和固碳能力的影响

陈平^1,2, 李芳彬^3,4, 向玮衡^1,2, 胡成^2,3, 刘俊^1,3, 王启杰^2,3

1.桂林理工大学,广西绿色建材与建筑工业化重点实验室,桂林 541004;
2.桂林理工大学,广西工业废渣建材资源利用工程技术研究中心,桂林 541004;
3.桂林理工大学,土木工程学院,桂林 541004;
4.桂林理工大学,有色金属矿产勘查与资源高效利用省部共建协同创新中心,桂林 541004

收稿日期:2024-07-11 修订日期:2024-10-12 出版日期:2025-01-15 发布日期:2025-01-23
通信作者: 向玮衡,博士,副研究员。E-mail:XWH891116@163.com
作者简介:陈平(1964—),男,博士,教授。主要从事固废资源化利用与绿色低碳胶凝材料等方面的研究。E-mail:m19978306769@163.com
基金资助:
广西青年人才专项(桂科AD22035126);广西自然科学基金(2023GXNSFBA026130);国家自然科学基金(52368029,52062009);广西绿色建材与建筑工业化重点实验室开发基金(桂科能22-J-21-19)

Effect of Calcium Silicon Ratio on Sintering Behavior and Carbon Sequestration Capacity of Calcium Silicate Mineral Phase

CHEN Ping^1,2, LI Fangbin^3,4, XIANG Weiheng^1,2, HU Cheng^2,3, LIU Jun^1,3, WANG Qijie^2,3

1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials, Guilin University of Technology, Guilin 541004, China;
3. College of Civil Engineering, Guilin University of Technology, Guilin 541004, China;
4. Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, Guilin 541004, China

Received:2024-07-11 Revised:2024-10-12 Published:2025-01-15 Online:2025-01-23

摘要/Abstract

摘要： 硅酸钙固碳胶凝材料是实现建材行业绿色可持续发展的重要方向,为探明钙硅比(n(CaO)∶n(SiO₂),摩尔比)对硅酸钙矿相组成和固碳能力的影响,本文通过调控钙硅比(n(CaO)∶n(SiO₂)=1.8～2.2)制备了硅酸钙固碳胶凝材料,采用t-pH、XRD、TGA、SEM等技术研究了硅酸钙固碳胶凝材料的相组成、碳化硬化过程、CO₂吸收率和碳化产物的演化规律。研究结果表明:γ型硅酸二钙(Ca₂SiO₄,γ-C₂S)生成量随钙硅比的增大先增加后减少;当钙硅比不高于2.0时,硅钙石(Ca₃Si₂O₇,C₃S₂)生成量随钙硅比的减小而增多,钙硅比大于2.0时,β型硅酸二钙(Ca₂SiO₄,β-C₂S)生成量随钙硅比的增大而增多;碳化0.5 h反应剧烈,抗压强度随钙硅比的增大先增加后降低,反应生成方解石、文石、球霰石。随着碳化反应延长至24 h,C₃S₂、γ-C₂S含量显著降低,方解石含量增长缓慢;C₃S₂降低了前期反应活性,但更持续的碳化反应和生成的多形态产物紧密交织,对后期抗压强度有提升作用,碳化24 h抗压强度和CO₂吸收率分别为129.76 MPa、18.57%。

关键词: 钙硅比, 硅酸钙, 烧结行为, 固碳能力, 抗压强度

Abstract: Calcium silicate carbonatable binder is an important direction to realize the green and sustainable development of building materials industry. In order to study the effect of calcium silicon ratio (n(CaO)∶n(SiO₂), molar ratio) on the composition of calcium silicate mineral phase and their carbon sequestration capabilities, calcium silicate carbonatable binders were synthesized with controlled calcium silicon ratio (n(CaO)∶n(SiO₂)=1.8~2.2). Techniques such as t-pH, XRD, TGA, and SEM were employed to examine the evolution of phase composition, carbonization hardening process, CO₂ uptakes and carbonization products of calcium silicate carbonatable binders. The results indicate that the content of γ-dicalcium silicate (Ca₂SiO₄, γ-C₂S) initially increases and subsequently decreases as the calcium silicon ratio rises. When the calcium silicon ratio is no higher than 2.0, the content of rankinite (Ca₃Si₂O₇, C₃S₂) gradually increases with the decreasing of calcium silicon ratio. When the calcium silicon ratio is higher than 2.0, the content of β-dicalcium silicate (Ca₂SiO₄, β-C₂S) progressively increases with the increasing of calcium silicon ratio. The reaction of carbonization for 0.5 h is intense, and the compressive strength initial increases and subsequent decreases as the calcium silicon ratio increases. The reaction produces calcite, aragonite and vaterite. With the content of C₃S₂ and γ-C₂S decreasing significantly, and the calcite content remains largely unchanged even when the carbonization reaction is extended to 24 h. C₃S₂ decelerates the early reaction of binder, but a more sustained carbonization reaction and a greater variety of carbonization products can enhance its subsequent compressive strength. The compressive strength and CO₂ uptakes after carbonization for 24 h reach 129.76 MPa and 18.57%, respectively.

Key words: calcium silicon ratio, calcium silicate, sintering behavior, carbon sequestration capacity, compressive strength

中图分类号:

TQ172

陈平, 李芳彬, 向玮衡, 胡成, 刘俊, 王启杰. 钙硅比对硅酸钙矿相烧结行为和固碳能力的影响[J]. 硅酸盐通报, 2025, 44(1): 297-304.

CHEN Ping, LI Fangbin, XIANG Weiheng, HU Cheng, LIU Jun, WANG Qijie. Effect of Calcium Silicon Ratio on Sintering Behavior and Carbon Sequestration Capacity of Calcium Silicate Mineral Phase[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 297-304.

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钙硅比对硅酸钙矿相烧结行为和固碳能力的影响

Effect of Calcium Silicon Ratio on Sintering Behavior and Carbon Sequestration Capacity of Calcium Silicate Mineral Phase

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