Assessing the quality of metallurgical coke by Raman spectroscopy

Metallurgical coke should be resistant to mechanical, thermal, and chemical influences. This resistance is related to the structural order of the organic constituents. Raman microspectroscopy of carbonaceous matter (RSCM) is demonstrated as a promising tool to investigate this property. Variations o...

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Bibliographic Details
Published in:International journal of coal geology 2014-08, Vol.130, p.1-7
Main Authors: Rantitsch, Gerd, Bhattacharyya, Anrin, Schenk, Johannes, Lünsdorf, Nils Keno
Format: Article
Language:English
Subjects:
Blast furnaces
Carbon dioxide
Carbonaceous materials
Coal
Coke
Coke reactivity
Earth sciences
Earth, ocean, space
Exact sciences and technology
Experimental heating
Metallurgical coke
Microstructure
Raman spectra
Raman spectroscopy
Sedimentary rocks
Transformations
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Summary:Metallurgical coke should be resistant to mechanical, thermal, and chemical influences. This resistance is related to the structural order of the organic constituents. Raman microspectroscopy of carbonaceous matter (RSCM) is demonstrated as a promising tool to investigate this property. Variations of the microstructure among samples with different quality parameters are detected by analyzing the Raman spectra collected on their individual coke lumps. Three basic types of Raman spectra are discriminated. Their predominance in a bulk sample predicts roughly the coke quality, estimated by an ISO standardized test. To investigate the structural behavior of coke in a blast furnace, several samples have been treated under typical gas atmospheres of the blast furnace process (carbon dioxide, nitrogen) at temperatures between 850°C and 1100°C for 120min. RSCM data measured on the treated lumps evidence a progressive transformation of poorly ordered organic microstructure towards a higher structural order. •Three basic types of Raman spectra are discriminated in coke.•Raman microspectroscopy predicts roughly the coke quality.•Poorly ordered coke microstructure is transformed towards a higher order.
ISSN:0166-5162
1872-7840
DOI:10.1016/j.coal.2014.05.005