Magnesia-based cement is recognized for its outstanding mechanical properties, but its environmental impact has not been thoroughly evaluated. This paper employs a comprehensive life cycle assessment methodology to systematically analyze the environmental effects of four kinds of MgO and 10 kinds of magnesia-based cements based on the data in the literature. The impacts include CO₂ emissions, fossil fuel depletion potential, and overall environmental impact indicators. The results indicate that using Salt Lake magnesium residue to prepare MgO, e.g., LB-MgO and DB-MgO, can reduce over 60% of CO₂ emissions, compared with traditional MgO (e.g., L-MgO and D-MgO) prepared with magnesite. Utilizing supplementary cementitious materials (e.g., fly ash and ground granulated blast-furnace slag) as substitutes for clinker in basic sulfate magnesium cement (BMSC) and magnesium phosphate potassium cement (MKPC) can also reduce approximately 16 and 45% of carbon emissions, respectively. In addition, carbonation-reactive magnesium cement (CRMC), which involves carbonation curing and replacing traditional MgO with Salt Lake magnesium residue, is the most environmentally friendly magnesia-based cement with an overall environmental impact indicator of 0.00078.

中文翻译：

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镁基水泥可以做到环保吗？


镁基水泥以其出色的机械性能而著称，但其对环境的影响尚未得到彻底评估。本文采用全面的生命周期评价方法，根据文献中的数据，系统分析了 4 种 MgO 和 10 种镁基水泥的环境影响。影响包括 CO₂ 排放、化石燃料消耗潜力和整体环境影响指标。结果表明，与用菱镁矿制备的传统 MgO（例如 L-MgO 和 D-MgO）相比，使用盐湖镁渣制备 MgO（例如 LB-MgO 和 DB-MgO）可以减少 60% 以上的 CO₂ 排放。在碱性硫酸盐镁水泥 （BMSC） 和磷酸镁钾水泥 （MKPC） 中使用补充胶凝材料（例如粉煤灰和磨碎的粒化高炉炉渣）作为熟料的替代品，也可以分别减少约 16% 和 45% 的碳排放。此外，碳化反应镁水泥 （CRMC） 涉及碳化固化和用盐湖镁渣替代传统 MgO，是最环保的镁基水泥，整体环境影响指标为 0.00078。