RHEOLOGICAL BEHAVIOUR OF LOW RANK COAL-WATER SLURRIES.
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The rheological behavior of low rank coal-water slurries was studied using a Brookfield Rheolog viscometer. A Sarpy Creek subbituminous coal from Montana, with particle sizes ranging from 0. 044 mm to 0. 233 mm, was used. The solids concentration in the slurry varied from 15 to 65 weight percent and the temperature was maintained constant at 82 degree F. The rheological behavior of the slurry made from as-received coal was compared with that of the slurry made from hot-water-dried coal. Coal-water slurries made from both as-received and hot-water-dried coal exhibited pseudoplastic behavior. The shear stress was found to be related to the shear rate by the power law model. As expected, the apparent viscosity was found to increase sharply with solids loading. It was also observed that the apparent viscosities of the slurries made from hot-water-dried coal were lower than those made from as-received coal.