Abstract—The effects of stabilizing agents on the rheological characteristics and static stability of highly-loaded coal-water slurry (HLCWS) were investigated in this study. Experiments were done on HLCWS prepared from sub-bituminous coal samples originated from Indonesia. Napthalene Sulfonate Formaldehyde (NSF) was the selected anionic dispersant used at fixed concentration. Three different stabilizers were chosen to study with a variation in quantity used. The results showed that the apparent viscosity of HLCWS increased due to the addition of stabilizer, resulting in a decrease in fluidity. However, static stability of HLCWS was found to effectively increase with the use of the stabilizer. Guar gum provided the most suitable apparent viscosity and static stability for HLCWS with 65% coal loading when compared to the others. It is also observed that the slurries exhibited non-Newtonian fluid behavior and expressed as pseudo plastic fluid.
Index Terms—Coal-water slurry (CWS), rheology, staticstability.
The authors are with the Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangsu, and Bangkok 10800, Thailand (e-mail:nuttakorn_cws@hotmail.com).
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Cite: N. Ongsirimongkol and M. H. Narasingha, "Effects of Stabilizing Agents on Stability and Rheological Characteristics of the Highly-Loaded Coal-Water Slurry," International Journal of Chemical Engineering and Applications vol. 3, no. 1, pp. 49-52, 2012.
