Microstructural evolution of metallurgical coke: Evidence from Raman spectroscopy

Gerd Rantitsch; Anrin Bhattacharyya; Ahmet Günbati; Marc-Andre Schulten; Johannes Schenk; Ilse Letofsky-Papst; Jörg Albering

doi:10.1016/j.coal.2020.103546

Microstructural evolution of metallurgical coke: Evidence from Raman spectroscopy

Gerd Rantitsch
, Anrin Bhattacharyya
, Ahmet Günbati
, Marc-Andre Schulten
, Johannes Schenk
, Ilse Letofsky-Papst
, Jörg Albering

thyssenkrupp Steel Europe AG
Technische Universität Graz

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

7 Zitate (Scopus)

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.

Originalsprache	Englisch
Aufsatznummer	103546
Seitenumfang	12
Fachzeitschrift	International journal of coal geology
Jahrgang	227.2020
Ausgabenummer	1 July
Frühes Online-Datum	23 Juni 2020
DOIs	https://doi.org/10.1016/j.coal.2020.103546
Publikationsstatus	Veröffentlicht - 1 Juli 2020

Bibliographische Notiz

Funding Information:
Support by the Bridge project 858526 “Forecast of coke quality under blast furnace condition by holistic characterization” of the Austrian Research Promotion Agency (FFG) is gratefully acknowledged. The authors thank A. Bauer and P. Diendorfer for technical assistance and Urban Janhsen for constructive discussions. We acknowledge gratefully the comments of two journal reviewer and the editorial support by Prof. Shifeng Dai.

Publisher Copyright:
© 2020 The Author(s)

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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.",

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AU - Schulten, Marc-Andre

AU - Schenk, Johannes

AU - Letofsky-Papst, Ilse

AU - Albering, Jörg

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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.

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