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<p>Magnesium slag (MS), an unavoidable waste material generated during primary magnesium metal production, accumulates in millions of tons yearly, causing significant environmental and waste management problems. This study combined thermal activation and water cooling (water quenching) methods to evaluate MS as a sustainable cement ingredient. Although MS is rich in CaO, SiO₂, and Fe₂O₃, with a chemical composition similar to that of Portland cement clinker, it generally exhibits adverse effects such as expansion, prolonged setting time, and loss of strength owing to its high free MgO and CaO contents. To address these problems, MS was sintered at elevated temperatures and then rapidly cooled using water quenching and spraying. Structural and mineralogical analyses showed that rapid cooling after thermal activation suppressed the formation of periclase and free lime, promoted the development of the alite (C₃S) phase, and increased the material’s reactivity. Water-cooled MS-added cement mortars exhibited significant early and long-term compressive strength increases, along with acceptable setting and volume stability. This innovative thermal-hydrocooling approach offers an energy-efficient and sustainable solution for using industrial magnesium slag as a high-volume cement replacement.</p>

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Influence of thermal treatment and water-cooling shock on the reactivity of modified Magnesium slag for low-carbon cement

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Abdul Vahap Korkmaz

摘要

Magnesium slag (MS), an unavoidable waste material generated during primary magnesium metal production, accumulates in millions of tons yearly, causing significant environmental and waste management problems. This study combined thermal activation and water cooling (water quenching) methods to evaluate MS as a sustainable cement ingredient. Although MS is rich in CaO, SiO₂, and Fe₂O₃, with a chemical composition similar to that of Portland cement clinker, it generally exhibits adverse effects such as expansion, prolonged setting time, and loss of strength owing to its high free MgO and CaO contents. To address these problems, MS was sintered at elevated temperatures and then rapidly cooled using water quenching and spraying. Structural and mineralogical analyses showed that rapid cooling after thermal activation suppressed the formation of periclase and free lime, promoted the development of the alite (C₃S) phase, and increased the material’s reactivity. Water-cooled MS-added cement mortars exhibited significant early and long-term compressive strength increases, along with acceptable setting and volume stability. This innovative thermal-hydrocooling approach offers an energy-efficient and sustainable solution for using industrial magnesium slag as a high-volume cement replacement.