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Coking coal is widely used in the steel manufacturing industry for the preparation of coke, as it leaves very less ash after burning. In the present study, rheology, settling characteristics, and pH of coking coal and water slurry (CCWS) are investigated. CCWS is tested for lower mass concentrations of 20%, 25%, and 30% and higher mass concentrations of 50%, 55%, 60%, and 65%, at different time intervals of 0 hours, 24 hours, 28 hours, 48 hours, and 72 hours. Majority of the samples were found to be non-Newtonian and following the Herschel Bulkley model of rheology. Obtained results are used for numerical modeling of rheological parameters, i.e. the flow index ( n ), the flow consistency index ( K ), and the yield stress ( τ0 ). Difference between the values predicted from the models with the values obtained from the experiments is within acceptable range. Static settled concentration of CCWS is obtained by performing sedimentation analysis for all the concentrations and found to be increasing with increasing concentration. pH of the CCWS is measured at all the concentrations. With the increase in concentration, pH of the CCWS is found to be decreasing.

Effect of soaking time on rheological properties and settling characteristics of coking coal slurry