煤系高岭土料浆的粘度及影响因素

煤系高岭土料浆的浓分散体系为非牛顿流体，具有剪切变稀的特性. 阴离子型分散剂聚丙烯酸钠可吸附于煤系高岭土颗粒的表面，改变其表面电势，增加颗粒间的排斥能，从而起到很好的分散作用. 通过实验，研究了固相浓度、分散剂用量、粒径大小等因素对煤系高岭土料浆粘度的影响. 固相浓度增大、粒径减小时，料浆的粘度增大；分散剂可使料浆粘度降低，当最佳用量为0.3%左右，在高剪切速率(729 s-1)下，固相浓度由30%(w)提高到70%(w)，料浆的粘度分别为0.004和0.020 Pa×s．

Viscosity of Kaolin Slurry from Coal Seam and the Influencing Factors

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 Pas and 0.020 Pas at high shear rate (729 s-1) with solid concentrations of 30%(w) and 70%(w) respectively.