Effect of Different Additives on Viscosity and Flow Bheaviour of Fly Ash Slurries

Abstract

The quantity of fly ash produced in such power stations is quite
enormous. The ash produced in such power stations is at present
being disposed to mid sea if the power station is situated near the
sea. Otherwise it is disposed in some waste lands. The ash produced
in power stations is being mostly transported in the form of water
slurry by pumping. Enormous quantity of water is being used for
such transportation. From the economical point of view, it is worthwhile
to explore the possibilities of reducing this enormous quantity
of water being used for slurry making. This is possible only if the
solid content of ash-slurry is increased thereby reducing the quantity
of water used and at the same time the slurry becomes easily pumpable
using slurry pumps. Loading higher solids in ash water slurries
becomes possible only if the viscosity of the slurry is reduced by
adding surface active agents. An attempt has been made in this
study to assess the effect of organic polymers which are surfactants
in reducing·the viscosity of the ash water slurries. It is proposoo to
study the combined effect of mineral matter in ash, and different
types of organic polymeric substanc:s on the viscosities if ash-water
slurries. The results obtained and discussed herein suggest that the
organic polymeric substances as additives reduce the viscosity of
the ash-water slurries with better reliability.