Effect of Anionic Dispersant on Rheological Properties of Acid-bentonite

The effect of anionic dispersant(sodium polyacrylate) on rheological properties for 10%(mass fraction) acid-bentonite dispersion were studied.The results show that,among dispersion containing dispersant dosage of 0.2%,0.4%,0.6% and 0.8%,respectively,the dispersion containing 0.4% dispersant has the lowest shear stress,apparent viscosity and yield stress.In range of studying shear rate,dispersion containing 0.4% dispersant exhibited dilatant characteristic and others transformed rheology from pseudoplastic to dilatant characteristic.The result also show that the rheograms fitting Herschel-Bulkley model are well.The mechanism of rheological properties on acid-bentonite dispersion was also discussed.