添加二氧化硅的煤石墨化高温高压模拟实验OA北大核心CSTPCD

This study investigates the effect of SiO2 minerals on coal graphitization under natural conditions through high-temperature and high-pressure simulation experiment to invert the coal-based graphite formation environment.We thoroughly mixed the SiO2 additive with the sorted vitrinite in coal(from the Ge-mudi mining area in Guizhou province[SW China])and then carried out high-temperature and high-pressure simulation experiment with ranging from 600℃to 1200℃,1.5 GPa to 2.0 GPa.The graphitization products of the samples were analyzed by X-ray diffraction,Raman spectroscopy,and high-resolution trans-mission electron microscopy(HRTEM)to investigate the influence of the SiO2 additive on the process of coal graphitization.Results show that in contrast to the graphitization-promoting ability exhibited in high-temperature environments,SiO2 demonstrates a hindering effect on graphitization in high-temperature and high-pressure environments,inhibiting the growth of coal graphitization.This finding provides an hypothesis for the lower graphitization of coal in areas with strong tectonics under natural conditions.