Investigation on the Mineral Catalytic Graphitization of Anthracite during Series High Temperature Treatment

Graphite can be artificially converted from anthracites under high temperatures; however, the exact mechanism through which inorganic minerals contribute to graphitization process is still unknown. In light of this, several selected in different amounts were added demineralized anthracite coal. The anthracite–mineral mixtures subjected artificial experiments temperatures ranging 1700 2900 °C laboratory. obtained series coal-based graphites with various levels characterized by X-ray diffraction (XRD), and derived structural parameters, such as d002 FWHM (002), La, Lc used compare carbon evolution during temperature treatment mineral catalytic graphitization. Moreover, amorphous eventually transformed into highly ordered crystalline graphite. five show interesting variation process, pyrite decomposed iron (Fe), illite, quartz, kaolinite, react disordered organic matter form moissanite (SiC), while dolomite seems sulfur oldhamite (CaS). At less than 2300 °C, could significantly enhance effect. There a clear difference effect on Kaolinite exhibits strongest dolomite, quartz only certain degree catalysis. Pyrite, has limited improving at °C. However, once exceeds dominant factor controlling appears temperature. According growth pattern microcrystalline sizes (La Lc), minerals’ effects classified three groups. first group includes that preferentially promote La growth, pyrite, quartz. second dolomite. Finally, kaolinite separate promotes microcrystal both lateral vertical directions simultaneously. mechanisms are discussed this paper. promotion role may help optimize reduce cost future.