摘要
基于焦炭是高炉炼铁中的重要炭源且在熔炉熔化区和滴落区起到不可替代的支撑、渗透和间接还原铁矿石的作用,因而通过添加芳香族重质物与炼焦煤共炭化制备焦炭为实现焦炭提质降本的重要途径之一。为了实现低阶煤快速干馏残渣(CRDR)的高附加值利用以及拓宽炼焦原料的来源,研究以CRDR为热塑性添加剂并分别与3种不同变质程度的炼焦煤共炭化处理,从而制备系列焦炭。利用转鼓强度、显微强度、偏光显微镜、扫描电镜(SEM)、XRD和Raman光谱等方法探讨共炭化过程中CRDR分别与3种不同变质程度炼焦煤之间的相互作用,探究CRDR对共炭化焦炭的结构性能和微晶结构的影响。结果表明:添加CRDR对共炭化焦炭性能的影响,随煤变质程度的升高而愈加明显;1/3焦煤中添加CRDR后,共炭化焦炭的转鼓强度和显微强度无明显变化,添加量提升至7%时,共炭化焦炭的光学各向异性指数(OTI)达到82.61,炭微晶结构更加规整;焦煤和瘦煤中添加CRDR后,共炭化焦炭的转鼓强度和显微强度有较大的提升,但添加量超过3%后,共炭化焦炭的OTI指数减小、石墨晶体含量降低,不利于晶体结构的生长。
Based on that the coke is an important carbon source in the blast furnace ironmaking and plays an irreplaceable role in supporting,infiltrating and indirectly reducing iron ore in the melting and dropping zones of the furnace,the preparation of coke by co-carbonization of coking coal through addition of aromatic heavy substances is one of the important ways to achieve coke quality and cost reduction.In order to realize the high value-added utilization of low-rank coal rapid distillation residue(CRDR)and broaden the source of raw materials for coking,the study was conducted to prepare a series of coke by using CRDR as a thermoplastic additive and co-carbonization with three types of coking coals with different metamorphic degrees,respectively.Tumbler strength,micro-strength,polarized light microscopy,scanning electron microscopy(SEM),XRD and Raman spectroscopy were used to explore the interactions between CRDR and three coking coals with different metamorphic degree during the co-carbonization process,respectively,and to investigate the effects of CRDR on the structural properties and microcrystalline structure of the co-carbonization coke.The results show that the influence of adding CRDR on the performance of co-carbonization coke becomes more and more obvious with the increase of the metamorphic degree of coal;the tumbler strength and micro-strength of co-carbonization coke have no obvious change after the addition of CRDR to 1/3 coking coal,and the optical anisotropy index(OTI)of the co-carbonization coke reaches 82.61 and the carbon microcrystalline structure becomes more regular when the amount of CRDR is increased to 7%;the addition of CRDR to coking coal and lean coal greatly improves the tumbler strength and micro-strength of co-carbonization coke;however,when the CRDR addition exceeds 3%,the OTI index and graphite structure content of the co-carbonization coke decrease,which is not conducive to the growth of the crystal structure.
作者
张玉柱
张慧超
伍定虎
朱亚明
程俊霞
王莹
赵雪飞
ZHANG Yuzhu;ZHANG Huichao;WU Dinghu;ZHU Yaming;CHENG Junxia;WANG Ying;ZHAO Xuefei(Institute of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China;The Key Laboratory of Liaoning Province for Advanced Coking Technology,Anshan 114051,China;Anshan Xingde Material Technology Corporation Ltd.,Anshan 114100,China)
出处
《煤质技术》
2025年第3期1-11,共11页
Coal Quality Technology
基金
国家自然科学基金资助项目(22208138)
辽宁省自然科学基金资助项目(2024-MS-179)
辽宁省高校基本科研业务费专项资金资助项目(LJ222410146051)。
关键词
低阶煤
共炭化
干馏残渣
炼焦煤
微观结构
结构性能
光学各向异性指数
转鼓强度
low rank coal
co-carbonization
distillation residue
coking coal
micro-structure
structural performance
optical anisotropy index
tumbler strength
