关键词: 煤系高岭土, 料浆, 粘度, 分散剂

Abstract: The concentrated suspension of the kaolin slurry, known as a non-Newtonian fluid, possesses the shear-thinning characteristic. Negative polyelectrolytes, such as sodium polyacrylate (NaPAA), adsorbed on the surfaces of kaolin particles, can change the potential of particle surfaces, produce repulsive forces between particles, and make the kaolin particles effectively disperse each other. The effects of solid concentration, dispersant content and size of particles on the characteristics of the kaolin slurry are presented in this paper. The slurry viscosity of the kaolin increases with the increase of solid concentration and the decrease of particle size. The optimum dosage of dispersant NaPAA is about 0.3%. For the dispersant content of 0.3%, the viscosities of the slurry are 0.004 Pa×s and 0.020 Pa×s at high shear rate (729 s-1) with solid concentrations of 30%(w) and 70%(w) respectively

Key words: kaolin, slurry, viscosity, dispersant