炼焦煤中镜质体光学性质在碳化过程中的变化规律

doi:10.13228/j.boyuan.issn1006-9356.20230427

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摘要研究炼焦煤中镜质体光学性质在碳化过程中的变化规律,对揭示碳化反应活性及结构变化具有重要意义。利用显微镜热台直接观测3种不同变质程度炼焦煤中镜质体在碳化过程中的软化熔融特征,利用煤岩学分析手段研究镜质体光学性质的变化规律及其对焦炭光学组织的影响。结果表明,在碳化过程中,炼焦煤中镜质体的光学性质呈阶段性变化。当碳化温度低于300 ℃时,镜质体的光学性质变化不大;反射率开始迅速上升的温度随变质程度而提高,低变质炼焦煤A为375 ℃,中变质炼焦煤B为400 ℃,高变质炼焦煤C为475 ℃。低变质炼焦煤A和中变质炼焦煤B中镜质体碳化产物的双反射率在425 ℃左右时显著降低,而高变质炼焦煤C在475~500 ℃略有降低。当碳化温度大于600 ℃后,3种炼焦煤中镜质体碳化产物的光学性质近似以线性速度迅速升高。

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关键词 ：炼焦煤, 镜质体, 光学性质, 碳化, 塑性变化

Abstract：The changes for optical properties of vitrinite in coking coals during carbonization is of great significance to reveal the structural change and reactivity in carbonization reaction. The softening and melting characteristics of vitrinite during carbonization, which were from 3 coking coals with different rank, were studied by heating stage microscope. The changes for optical properties of vitrinite and its influence on the optical structure of coke were studied by petrological analysis. The results show that the optical properties of carbonized vitrinite in coking coals increase in stages. The optical properties of carbonized vitrinite have little change when the carbonization temperature is lower than 300 ℃. The temperature at which the reflectance begin to rise rapidly is closely related to the rank, as low rank coking coal A is 375 ℃, medium rank coking coal B is 400 ℃, and high rank coking coal C is 475 ℃. The bireflectance of carbonized vitrinite in low rank coking coal A and medium rank coking coal B decrease significantly at about 425 ℃, while that of high rank coking coal C decreases slightly at the temperature range of 475-500 ℃. When the carbonization temperature is higher than 600 ℃, the optical properties of the carbonized vitrinite in three coking coals increase rapidly at a linear rate approximately.

Key words： coking coal vitrinite optical property carbonization plastic change

收稿日期: 2023-07-14

作者简介: 王越(1987—), 男, 博士, 高级工程师; E-mail: wangyue8211@sina.com

引用本文:

王越, 庞克亮, 吴昊天, 谷致远, 刘福军, 赵华. 炼焦煤中镜质体光学性质在碳化过程中的变化规律[J]. 中国冶金, 2023, 33(11): 39-47. WANG Yue, PANG Keliang, WU Haotian, GU Zhiyuan, LIU Fujun, ZHAO Hua. Changes for optical properties of vitrinite in coking coals during carbonization[J]. China Metallurgy, 2023, 33(11): 39-47.

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http://www.zgyj.ac.cn/CN/10.13228/j.boyuan.issn1006-9356.20230427 或 http://www.zgyj.ac.cn/CN/Y2023/V33/I11/39

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