Microstructural evolution of metallurgical coke: Evidence from Raman spectroscopy
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In: International journal of coal geology, Vol. 227.2020, No. 1 July, 103546, 01.07.2020.
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TY - JOUR
T1 - Microstructural evolution of metallurgical coke: Evidence from Raman spectroscopy
AU - Rantitsch, Gerd
AU - Bhattacharyya, Anrin
AU - Günbati, Ahmet
AU - Schulten, Marc-Andre
AU - Schenk, Johannes
AU - Letofsky-Papst, Ilse
AU - Albering, Jörg
N1 - Publisher Copyright: © 2020 The Author(s)
PY - 2020/7/1
Y1 - 2020/7/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85086991327&partnerID=8YFLogxK
U2 - 10.1016/j.coal.2020.103546
DO - 10.1016/j.coal.2020.103546
M3 - Article
VL - 227.2020
JO - International journal of coal geology
JF - International journal of coal geology
SN - 0166-5162
IS - 1 July
M1 - 103546
ER -
