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Titre du document / Document title

Differences in the coking and non-coking coals from the standpoint of carbon structure

Auteur(s) / Author(s)

OZAKI Jun-Ichi ; UOZUMI Yuki ; OYA Asao ; SAITO Koji ; AIZAWA Sadayoshi ;

Résumé / Abstract

The purpose of the present study is to clarify the differences in the carbon structure of cokes derived from coking coals and non-coking coals. The structures of the carbonized coals at 1000°C were estimated from the X-ray diffraction and Raman spectroscopy measurements of the carbons heat-treated at 3000°C. This was based on the conventional recognition in carbon science such that the structures of carbons become obvious after heat-treatments at graphitization temperature, 3000°C. Three polymers and five coals confirmed the above recognition from the analyses of the carbons prepared at different temperatures. Essentially, coking coals and non-coking coals could be classified to graphitizing and non-graphitizing carbons, respectively. By close inspections of carbon (002) X-ray diffractions of 3000°C treated coals, it was found that the degrees of graphitizing and non-graphitizing abilities of coals were not as complete as the typical polymer-derived carbons. The Raman spectra of the carbons from non-coking coals prepared at 3000°C revealed the inhomogeneous structures of the carbons, because they gave position-dependent Raman spectra. Structural models of the cokes from coking and non-coking coals by taking account of continuous self-dissolving model were proposed. The important point of the model is that cokes consist of ordered matrix and disordered 'islands' in the matrix. The differences between the coking coal-derived ones and the non-coking coal-derived ones are found in the size and the distribution of the disordered islands.

Revue / Journal Title

Tetsu-to-hagané    ISSN  0021-1575   CODEN TEHAA2 

Source / Source

2006, vol. 92, no3, pp. 157-163 [7 page(s) (article)]

Langue / Language

Japonais

Editeur / Publisher

Nippon Tekko Kyokai, Tokyo, JAPON  (1915) (Revue)

Mots-clés d'auteur / Author Keywords

coking

;

carbonization

;

coal

;

X-ray diffraction

;

Raman spectroscopy

;

Localisation / Location

INIST-CNRS, Cote INIST : 7329, 35400015673974.0090

Nº notice refdoc (ud4) : 17705638



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