Abstract Raman spectroscopy traces the microstructural evolution of carbonaceous matter (CM) during artificial heating. Thermo-chemical reactivity and strength of blast furnace coke at 1100 °C is dependent on the graphitization state of the feed coke. A standard coke reactivity index (CRI) sample is composed of lumps, showing a high microstructural variability. The frequency distribution of the D-STA parameter estimated by the “Interactive Fitting of Raman Spectra” (IFORS) software suggests a positive correlation between degree of CM organization and CRI. Samples from the tuyere region of an operating blast furnace evidence graphitization of CM at temperatures higher than 1900 °C. IFORS parameters, calibrated by x-ray diffraction-based lattice dimensions and transmission electron microscopy data constrain a temperature gradient decreasing from the raceway to the deadman zone. The gradient controls a continuous variation of the petrographic coke texture. As an application, the IFORS method is able to map the graphitization zones in the hearth of a working blast furnace.

中文翻译：

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冶金焦的微观结构演变：来自拉曼光谱的证据

摘要 拉曼光谱追踪了人工加热过程中碳质物质 (CM) 的微观结构演变。高炉焦炭在 1100 °C 时的热化学反应性和强度取决于原料焦炭的石墨化状态。标准焦炭反应性指数 (CRI) 样品由块状物组成，显示出高度的微观结构变异性。由“拉曼光谱的交互式拟合”（IFORS）软件估计的 D-STA 参数的频率分布表明 CM 组织程度与 CRI 之间存在正相关。来自运行中的高炉风口区域的样品证明 CM 在高于 1900 °C 的温度下石墨化。IFORS 参数，通过基于 X 射线衍射的晶格尺寸和透射电子显微镜数据校准，限制了从滚道到死区的温度梯度。梯度控制岩相焦纹理的连续变化。作为一种应用，IFORS 方法能够绘制工作中高炉炉膛中的石墨化区域。