Abstract
AbstractThe 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.
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