China Nonferrous Metallurgy

China generates approximately 8 million tons of magnesium slag annually. Constrained by treatment costs and technological limitations， most magnesium slag is currently stored haphazardly or landfilled. Numerous scholars have explored the recent resource utilization of magnesium slag. In this paper， the physical and chemical properties， environmental hazards and resource utilization of magnesium slag are systematically reviewed. The key points and improvement strategies of its application in cementitious materials， cement clinker and carbon sequestration materials are discussed， which provides theoretical support and technical reference for the comprehensive utilization of magnesium slag. Primarily composed of CaO and SiO?， with a mineral composition dominated by β -C ? S and γ -C ? S， magnesium slag has been explored of applications in cementitious materials， ceramics， and carbon sequestration materials. Extensive research exists on magnesium slag as a cementitious material and cement clinker admixture. When used in cementitious materials， it requires synergistic application with other industrial solid wastes to enhance reactivity and improve mechanical properties. Its latent cementitious activity can also be released through physical or chemical activation. As a cement clinker admixture， its dosage impact must be carefully considered. Magnesium slag exhibits promising application potential in high-value-added innovation fields： magnesium slag-based carbon sequestration materials offer advantages such as low cost， high strength， and relative stability， with future applications in road subgrades and mine backfilling； magnesium slag thermal storage ceramics， with their high specific heat capacity and excellent thermal stability， are suitable as heat storage media for solar thermal power generation systems； magnesium slag adsorbents can achieve contaminant removal； magnesium slag can replace traditional precious metals as catalysts， reducing production costs. At present， the actual utilization rate of magnesium slag is still very low. The main problems in the field of cementitious materials are low activity， unstable volume and high cost of excitation technology， which still need to be explored continuously. In the future， the comprehensive utilization of magnesium slag can be studied in high value-added fields and mine filling fields to broaden its available range.