Synergistic carbonation reaction mechanism of steel slag-magnesium slag

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-14 DOI:10.1016/j.conbuildmat.2025.144015

Weiyi Yuan , Gaoyin Zhang , Laibao Liu , Weilong Wang , Kuiwen Gong , Xu Luo , Tao Gu , Lihua Zhang , Feng Zhao

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Abstract

Carbonatable cementitious materials convert industrial waste gases into stable carbonates via CO₂ mineralization technology, thereby significantly reducing carbon emissions in the construction industry. Magnesium slag (MS) and steel slag (SS) exhibit strong carbonation reactivity owing to their high contents of CaO, SiO₂, and other oxides. However, the interlacing and encapsulation effects of carbonation-hydration products inhibit the carbonation reaction. In this paper, the suspension carbonization method is used to improve the carbon fixation efficiency of the material, and the synergistic carbonization efficiency and reaction mechanism of MS and SS under the condition of suspension carbonization are explored. The results indicate that the CO₂ adsorption rates of MS and SS under synergistic carbonation reach 5 % within 5 min, achieving a carbonation degree of 7 %. XRD and TG analyses indicate that with minor SS addition, Mg^2 + incorporates into calcite by substituting Ca²⁺, forming a magnesian calcite (CaMg(CO₃)₂) structure. However, this phenomenon is suppressed with increasing SS content. SEM results demonstrate that the amorphous phases coating MS and SS surfaces mainly consist of: (i) Si-gel phases derived from SiO₂ in the system and (ii) incompletely nucleated amorphous calcium carbonate (ACC) phases. However, these amorphous coatings inhibit Mg²⁺ leaching.

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钢渣-镁渣协同碳化反应机理

可碳化胶凝材料通过二氧化碳矿化技术将工业废气转化为稳定的碳酸盐，从而显著减少建筑行业的碳排放。镁渣（MS）和钢渣（SS）由于含有大量的CaO、SiO2等氧化物而表现出较强的碳化反应活性。然而，炭化-水化产物的交织和包封作用抑制了炭化反应。本文采用悬浮碳化法提高材料的固碳效率，探索悬浮碳化条件下MS和SS的协同碳化效率和反应机理。结果表明，在5 min内，MS和SS对CO2的吸附率可达5 %，碳化度可达7 %。XRD和TG分析表明，添加少量SS后，Mg2 +取代Ca2+并入方解石中，形成镁质方解石（CaMg(CO3)2）结构。然而，随着SS含量的增加，这种现象被抑制。SEM结果表明，包覆在MS和SS表面的非晶相主要包括：(i)源自体系中SiO2的硅凝胶相和（ii）不完全成核的非晶碳酸钙（ACC）相。然而，这些非晶涂层抑制了Mg2+的浸出。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.