摘要
为了研究焦炭的微观组织在高炉软熔带的变化规律,利用高温热重分析仪对焦炭进行了不同温度下固定熔损率的气化实验,采用X射线衍射仪技术、低温氮气吸附法研究分析了微观结构的变化。结果表明,相同反应温度下,层片间距d002均随熔损率的增加逐渐减小,堆积高度Lc、微晶尺寸La、片层数N、芳香碳层的芳环个数n及石墨化度r0均随着熔损率的增加而增加;在较低温度下气化反应与有序化进程对焦炭孔径的作用主要是新增微孔数量以及扩大微孔孔径,而在较高温度下则主要是气孔的相互贯通形成大孔以及孔坍塌;微孔在熔损后扩大为上一级孔,总孔容下降,比表面积下降。
In order to study the changes of coke microstructure in blast furnace soft melt zone, the coke was subjected to gasification experiments with fixed melt loss rate at different temperatures using high temperature thermogravimetric analyzer, and the changes of microstructure were studied and analyzed by X-ray diffractometer technique and low temperature nitrogen adsorption method. The results show that at the same reaction temperature, the lamellar spacing d002decreases with the increase of melting loss rate, and the stacking height Lc, microcrystalline size La, lamellar layers N, aromatic rings n and graphitization degree r0increase with the increase of melting loss rate.At lower temperatures, gasification reaction and ordering process mainly increase the number of micropores and expand the pore size of coke. At higher temperatures, the pores are mainly connected to form macropores and collapse;after melting loss, the micropores expand to the upper level, the total pore volume decreases, and the specific surface area decreases.
作者
韩嘉庆
闫焕敏
闫立强
杨庆彬
李先春
HAN Jiaqing;YAN Huanmin;YAN Liqiang;YANG Qingbin;LI Xianchun(School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Tangshan Shougang Jingtang Xishan Coking Corporation Ltd.,Tangshan 063000,Hebei,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2023年第2期138-147,共10页
Journal of Iron and Steel Research
关键词
熔损反应
XRD
微晶结构
气孔结构
loss reaction
XRD
microcrystalline structure
pore structure
