Study on the Rheological Property of Flocculation Treated Fe_2O_3 Suspension

The rheological property of flocculation treated micron ferric oxide suspension was measured by LVDV-Ⅲ + type programmable rheometer.The factors investigated included the mass concentration of the solid phase,the pH value,the flocculant dosage and the stirring speed.The results showed that the rheological property changed with the concentration of the suspension,the apparent viscosity and shear stress of the high mass fraction suspension were greater than those of the low mass fraction suspension in the same shear rate.The pH value had an important influence on the rheological property of flocculated suspension.The viscosity of suspension first increased and then decreased with the increasing of pH,the maximum viscosity occurred at pH = 6.14 when the amount of flocculant PAC was 80mg.Flocculant concentration also affected the rheological property of suspension,the apparent viscosity and shear stress of suspension adding high concentration flocculant were greater than those of suspension adding low concentration flocculant in the same shear rate,increasing flocculant concentration had a positive significance to improve the adhesive properties of the suspension.The rheological property also changed with the stirring strength,in the same shear rate,the apparent viscosity and the shear stress of the suspension first increased and then decreased with the increasing of stirring strength.