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Microanalytical Characterization of Mineral Impurities and their Effect to Graphitizability of Brown Coal Pitch Cokes
Author(s) -
Preiss H.,
Adam K.
Publication year - 1982
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170171016
Subject(s) - impurity , crystallite , mineral , coal , microanalysis , characterization (materials science) , sulfur , chemistry , mineralogy , analytical chemistry (journal) , xylene , materials science , inorganic chemistry , metallurgy , crystallography , benzene , organic chemistry , nanotechnology
The main impurities in brown coal pitch cokes are Si, S, Ca, Fe, Al and Mg. Microanalysis exhibits that these elements besides sulphur are localized in non‐carbonaceous particles which are identical with the mineral impurities in the pitch precursors. Sulphur is present both in sulphate particles and as “organic” sulphur in the carbonaceous phase. The impurities reduce optical anisotropy and graphitizability of electrode cokes. Crystallite size and xylene density were measured to characterize the graphitizability.