The knowledge of rheological properties for different materials for slurry preparation is of great importance. These topics are studied and severely important for several technical applications e.g. process control in chemical engineering, casting of ceramics, storage, transport of solids in pipelines and atomization. A literature on the change in rheological properties of coal water slurry is reviewed. The adsorption effect of surfactants like cationic, anionic and nonionic on the solid liquid interface is investigated. The rheological behaviors of kaolin-water slurry are experimented by using a rotational viscometer (Brookfield syncrolacto viscometer) with different solid concentrations. These experiments are conducted under a particular speed (in rpm) of the spindle, temperature and ph condition. The adsorption kinetics for the three different surfactants at their CMC values is studied for different amount of kaolin (in wt %) using a UV spectrophotometer. The cause of change in viscosity is investigated with the out coming results of the experiments and found that cationic and anionic surfactants affect the kaolin-water slurry rheology severely
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