A PREDICTION OF MICUM STRENGTH OF METALLURGICAL COKE USING RUHR DILATOMETRIC PARAMETERS OF PARENT COALS

The Polish Bellview, Australian Agro-Allied and American Carbon Energy coals were subjected to Ruhr dilatometric analysis to predict their suitability for cokemaking. The Ruhr dilatometric softening point, maximum contraction, maximum dilatation, maximum contraction temperature and the G-value coking capacities were determined from which G-values of 0.97, 0.93, 0.94 and 1.01 were calculated for Bellview 1, Bellview 2, Agro-Allied, and Carbon Energy respectively. Also, micum 10 indices of 11.40%, 15.40%, 15.40% and 25% and micum 40 indices of 77.80%, 70.80%, 78.20%, and 64.16%, respectively were determined for Bellview 1, Bellview 2, Agro-Allied and Carbon Energy coals. The studies confirmed that Simonis’ G-value provides a reliable indication of coke micum strength indices, with the two strength parameters found to be poor at G-values below and above the Simonis’ range of 0.95 to 1.15. The analysis results showed th at Bellview 1 with the nearly mid-value coking capacity of 0.97 has the best combination of resistance to abrasion and fragmentation.