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Revealing the tricalcium silicate formation behaviors in modified EAF slag at high temperatures for the production of electric recycled cement
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-12-06 , DOI: 10.1016/j.cemconres.2024.107756
Mingrui Yang, Zhiming Yan, Zushu Li

The formation behaviors of tricalcium silicate (C3S) in modified EAF slag were investigated to assess the feasibility of using EAF slag for cement clinker production. For the formation conditions of C3S, the C3S content in slag exhibits a notable increase with elevating slag basicity and reaction time, while only a slight enhancement with temperature rising from 1400 °C to 1500 °C. The C3S formation mechanism depends on the local conditions in the slag. In the lime-rich region it primarily takes place through the direct formation, i.e. 3CaO(s) + SiO2(l) = 3CaO·SiO2(s), controlled by the diffusion of SiO44− in liquid phase. Conversely, in the dicalcium silicate (C2S) rich region, C3S formation primarily occurs via the indirect formation: 2CaO·SiO2(s) + CaO(l) = 3CaO·SiO2(s), with the reaction being controlled by the diffusion of Ca2+ in the liquid slag.

中文翻译:


揭示改性电弧炉渣在高温下硅酸三钙的形成行为,用于生产电再生水泥



研究了硅酸三钙 (C3S) 在改性电弧炉渣中的形成行为,以评估利用电弧炉渣生产水泥熟料的可行性。对于 C3S 的形成条件,随着炉渣碱度和反应时间的提高,炉渣中 C3S 含量显著增加,而随着温度从 1400 °C 升高到 1500 °C,C3S 含量仅略有增加。 C3S 的形成机制取决于炉渣中的当地条件。在富含石灰的地区,它主要通过直接形成,即 3CaO(s) + SiO2(l) = 3CaO·SiO2(s),受 SiO44− 在液相中的扩散控制。相反,在富含硅酸二钙 (C2S) 的区域,C3S 的形成主要通过间接形成:2CaO·SiO2(s) + CaO(l) = 3CaO·SiO2(s),反应由 Ca2+ 在液态渣中的扩散控制。
更新日期:2024-12-06
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