Abstract Iron coke, as a new type of blast furnace burden is helpful for energy saving, emission reduction and green production of iron making. This study aims to investigate the strength degradation mechanism of iron coke prepared by mixed coal and Fe2O3 to provide a theoretical direction to improve its strength. Coking and pyrolysis experiments of mixed coal and Fe2O3 were carried out between 400 and 500 ℃ temperature. Gieseler plastometer and derivative thermogravimetric (DTG) showed that added Fe2O3 inhibited the thermoplasticity and pyrolysis process of mixed coal during coking. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) results showed that added Fe2O3 decreased the aromaticity and average stacking height, but increased the interlayer spacing of crystallite, aliphatic chain length and hydrocarbon-generating potential of mixed coal during coking. Further, gas chromatography-mass spectrometer (GC MS) analysis suggested that the added Fe2O3 inhibited the cleavage of Cal O, Cal S, Cal N, Cal Car and Cal Cal bonds, reduced the generation of ethylbenzene, o-xylene and unbranched alkanes with carbon atoms in 24–26, thus decreased the amount of fluid phase generated in coking and ultimately degraded the strength of iron coke.

中文翻译：

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煤与Fe2O3混合制备铁焦强度降解机理

摘要 铁焦作为一种新型的高炉炉料，有利于炼铁节能减排和绿色生产。本研究旨在探讨混合煤与Fe2O3制备的铁焦强度劣化机理，为提高其强度提供理论指导。混合煤与Fe2O3的焦化和热解实验在400～500℃的温度下进行。Gieseler 塑性计和衍生热重 (DTG) 表明，添加的 Fe2O3 抑制了焦化过程中混合煤的热塑性和热解过程。X射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）结果表明，添加Fe2O3降低了芳香性和平均堆积高度，但增加了微晶的层间距，混合煤炼焦过程中脂肪族链长及生烃潜力. 此外，气相色谱-质谱仪 (GC MS) 分析表明，添加的 Fe2O3 抑制了 Cal O、Cal S、Cal N、Cal Car 和 Cal Cal 键的断裂，减少了乙苯、邻二甲苯和直链烷烃的生成24-26 个碳原子，从而减少了焦化中产生的流体相量，最终降低了铁焦的强度。