Open AccessEffect of coal beneficiation process on rheology/atomization of coal water slurries. Quarterly progress report, April 1, 1995--June 30, 1995
Author(s) -
F. Ohene
Publication year - 1995
Language(s) - English
Resource type - Reports
DOI - 10.2172/113907
Subject(s) - rheology , beneficiation , coal , slurry , shear rate , shear (geology) , materials science , coal slurry , coal water , mineralogy , metallurgy , waste management , composite material , geology , engineering
The overall objective of this project is to perform experiments to understand the effect of coal beneficiation processes and high shear rheological properties on the atomization of coal-water slurries (CWS). In the atomization studies, the mean drop size of the CWS sprays will be determined at various air to CWS. A correlation between the high shear rheological properties, particle size distributions and the atomization will be made in order to determine the influence of these parameters on the atomization of CWS. Rheological properties of the CWS samples were determined after a six month storage period and the properties compared to freshly prepared samples. The rheological evaluations made include: flow characteristics under low shear rates; flow characteristics under high shear rates; and viscoelastic behavior under low frequency of oscillations. All the three CWS samples formed a hard pack solid at the end of the six month storage period, and had to be redispersed. The flotation cleaned coal and the heavy-media cleaned coal however, had the tendency to settle much faster than the uncleaned coal. Each of them remained completely dispersed during the duration of the testing period