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.
Original language | English |
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Article number | 103546 |
Journal | International Journal of Coal Geology |
Volume | 227 |
DOIs | |
Publication status | Published - 1 Jul 2020 |
Keywords
- Coke reactivity
- Coke texture
- Metallurgical coke
- Raman spectroscopy
- Transmission electron microscopy
- Tuyere coke
- X-ray diffractometry
ASJC Scopus subject areas
- Materials Science(all)
- Economic Geology
- Geology
- Fuel Technology
- Stratigraphy
Fields of Expertise
- Advanced Materials Science
Treatment code (Nähere Zuordnung)
- Basic - Fundamental (Grundlagenforschung)