Rheological Behavior of Fly Ash Suspension with Additive for Hydraulic Conveyance

Abstract

In the present work, rheological behaviour of a fine particulate fly ash slurry suspension is studied with and without addition of an additive. Rheological experiments are performed for the range of shear rate from 50 to 200 s 1 . Sodium sulfate is used as an additive in the fraction of 0.2 , 0.4 and 0.6 % (by weight). Addition of sodium sulfate to the fly ash slurry suspension leads to an improvement of its rheological characteristics. A reduction in relative viscosity and pressure drop is more pronounced with the addition of sodium sulfate in proportion of 0.4 %, while marginal with 0.2 and 0.6 % (by weight). The analysis reveals that the fly ash suspension has a potential to for being transported in a slurry pipeline with higher concentration and minimum energy consumption.

Keywords

• fly ash
• rheology
• relative viscosity
• pressure drop
• energy consumption