添加二氧化硅的煤石墨化高温高压模拟实验  

High-temperature and high-pressure simulation of coal graphitization with SiO_(2) additive

作　　者：陈高健 曹代勇[1] 王安民[1] 魏迎春[1] 刘志飞[1] 赵萌 CHEN Gaojian;CAO Daiyong;WANG Anmin;WEI Yingchun;LIU Zhifei;ZHAO Meng(College of Geoscience and Surveying Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Hunan Provincial Key Labratory of Geochemical Processes and Resource Environmental Effects,Changsha Hunan 410116,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]地球化学过程与资源环境效应湖南省重点实验室,湖南长沙410116

出　　处：《矿业科学学报》2024年第2期144-155,共12页Journal of Mining Science and Technology

基　　金：国家自然科学基金(42072197,41902170,41772156)。

摘　　要：为研究自然条件下二氧化硅矿物对煤石墨化作用的影响,将二氧化硅添加剂与分选后的煤中镜质组(来自中国西南部贵州省格目底矿区)充分混合后,开展实验条件为600~1 200℃、1.5~2.0 GPa的高温高压模拟实验,对煤系石墨形成环境进行反演。通过X射线衍射、拉曼光谱和高分辨率透射电镜对石墨化产物进行分析,研究二氧化硅对煤的石墨化过程的影响。研究发现,二氧化硅在高温高压环境下存在阻碍石墨化作用的效果,抑制煤石墨化程度的增长。这一结果可为自然条件下构造强烈地区煤石墨化程度较低的现象提供一种解释。This study investigates the effect of SiO_(2) 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 SiO_(2) additive with the sorted vitrinite in coal(from the Gemudi mining area in Guizhou province[SW China]) and then carried out high-temperature and high-pressure simulation experiment with ranging from 600 ℃ to 1 200 ℃,1.5 GPa to 2.0 GPa.The graphitization products of the samples were analyzed by X-ray diffraction,Raman spectroscopy,and high-resolution transmission electron microscopy(HRTEM) to investigate the influence of the SiO_(2) additive on the process of coal graphitization.Results show that in contrast to the graphitization-promoting ability exhibited in high-temperature environments,SiO_(2) 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.

关 键 词：煤系石墨 高温高压 二氧化硅添加剂 石墨化 

分 类 号：P62[天文地球—地质矿产勘探]