SOLVENT REFINED COAL FROM HIGH-ASH NON WEAKLY COKING COALS FOR USE INMETALLURGICAL COKE MAKING .2. UTILIZATION AS A COKING ADDITIVE/

Solvent refined coal (SRC) prepared from high-ash Indian non/weakly co king coals, as reported earlier (S.B. Choudhury, B.B. Brahamachari, S. R. Dwivedi, A.K. Roy, P.K. Dasgupta, M. Chakraborty, R. Hague, Solvent refined coal from high-ash non-coking coals/washery middlings for use in metallurgical coke making: part I, Fuel Processing Tech., USA, Jun e '96, pp. 203-213), when blended in small doses (8-12%) with substand ard coking blends and carbonised, yields coke with increased anisotrop y as well as hot and cold strengths. This is reflected by positive imp rovement in the values of the Micum indices (M-40 and M-10), coke reac tivity index (CRI) and the coke strength after reaction with CO2 (CSR) and also the optical texture of the resultant coke as reported in thi s paper. The authors confirmed, by pilot scale carbonisation tests (25 0 kg/batch) that SRC produced by the technology developed (S.B. Choudh ury, B.B. Brahamachari, S.R. Dwivedi, A.K. Roy, P.K. Dasgupta, M. Chak raborty, R. Hague, Solvent refined coal from high-ash non-coking coals /washery middlings for use in metallurgical coke making: part I, Fuel Processing Tech., USA, June '96, pp. 203-213) can help in substituting high-fluid low ash prime coking coals (PCC) to the extent of 30% (by weight). The use of SRC can thus accommodate additional quantum of med ium coking coals (MCC) in the coking blends of the major Indian steel plants. The large reserves of indigenous medium coking coals, especial ly low volatile medium coking coals (LVMC) after beneficiation can als o be used in the blends for making blast furnace grade coke thereby co nserving scarce prime coking coals. (C) 1997 Elsevier Science B.V.