镁渣是提镁冶炼生产过程中排放的固体废弃物,然而关于镁渣中精炼镁渣的系统研究报道较少。为探究精炼镁渣的理化性质,以山西某精炼镁厂产生的精炼镁渣为原料,利用高温箱式炉、X射线荧光光谱仪（XRF）、X射线衍射仪（XRD）和扫描电镜-能谱联用仪（SEM-EDS）等表征手段进行了理化性质的研究。结果表明,精炼镁渣的主要成分为氯化镁（MgCl₂·6H₂O）,对其进行氯化镁的回收是较为可行的方案。精炼镁渣中氮化镁（Mg₃N₂）的存在说明在对粗镁进行熔融过程中过高的熔融温度导致精炼出的单质镁和氮气发生反应。精炼熔剂的密度调配也会直接影响精炼镁渣中镁珠分离的难易程度。对镁渣进行破碎风选可以有效地对无用杂质进行分离,也会使精炼镁渣块中包裹的镁珠更好地暴露出来,有利于资源的回收。最后,对目前中国精炼镁渣的利用途径进行了论述,得出精炼镁渣具有较好的高值化利用前景,可以实现废物资源的再利用。

Magnesium slag is a solid waste discharged during the production process of magnesium extraction and smelting.However,there are few systematic research reports on the refining of magnesium slag.In order to explore the physical and chemical properties of refined magnesium slag,the refined magnesium slag produced in a refining magnesium plant in Shanxi was used as raw material,and the physical and chemical properties were studied using high-temperature box furnace,X-ray fluorescence spectrometer（XRF）,X-ray diffractometer（XRD）,and scanning electron microscope-energy dispersive spec-trometer（SEM-EDS）.The results showed that the main component of refined magnesium slag was MgCl₂·6H₂O,and the re-covery of magnesium chloride was a more feasible solution.The presence of magnesium nitride（Mg₃N₂） in the refined magne-sium slag indicated that the excessively high melting temperature during the melting of crude magnesium caused the refined elemental magnesium to react with nitrogen.The density adjustment of the refining flux would also directly affect the ease of separation of the magnesium beads in the refined magnesium slag.The crushing and winnowing of the magnesium slag could effectively separate the useless impurities,and would better expose the magnesium beads wrapped in the refined magnesium slag,which was beneficial to the recovery of resources.Finally,the current utilization of refined magnesium slag in China was discussed,and it was concluded that refined magnesium slag had good prospect of high-value utilization and could realize the reuse of waste resources.