The main factors affecting the purity of aphanitic graphite are discussed. This artcle pointed out that quartz, kaolinite, illite, andalusite, sericite and a small amount of impurities such as pyrite, tourmaline, limonite and calcite, are the main factors influencing the purity of aphanitic graphite. This paper introduces the methods of physical purification and chemical purification, which are used in the purification of graphite. The principle, technical features and existing problems of various purification methods above are analyzed. The development of the technology for the purification of the crystalline graphite is prospected. It is pointed out that the purification technology of the crystalline graphite will be in the direction of energy saving, environmental protection and synthesis.%阐述了影响隐晶质石墨纯度的主要因素,指出石英、高岭石、伊利石、红柱石、绢云母及少量黄铁矿、电气石、褐铁矿、方解石等杂质矿物是影响隐晶质石墨纯度的主要因素.介绍了物理提纯法及化学提纯法是隐晶质石墨提纯的常用方法,分析了各种提纯方法的原理、技术特点以及存在的问题.对未来隐晶质石墨提纯技术的发展前景进行了展望,指出隐晶质石墨提纯技术将向着节能化、环保化、综合化的方向发展.
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