The rheological study of slurry containing china clay and ball clay using different deflocculant

Abstract

Different proportion of china clay and ball clay were taken to make clay mixture containing china clay: ball clay in the ratio 70:30, 80:20, 90:10. The clay mixture were used to prepare clay slurries with different solid loading viz. 15, 20 and 25 vol%. Three Deflocculants e.g. Sodium Silicate, Darvan C and Sodium Carbonate were taken in the proportion 0.2%, 0.4% and 0.6% and the clay slurries were stabilized by pot milling for 10 hours. Shear stress- Shear rate behavior, viscosity- shear rate variation, ôgel,ôyeild were studied as a function of deflocculant type, amount and solid loading. Settling heights and pH change of the slurries were also studied. The study indicates that the optimized slurry should have 20% solid loading and 0.2% Deflocculant