In addition to the above, it is observed that the alkali content of preheater gas from the
modern plant has been considerably reduced. Water-soluble alkalis (Na, K) are known for
their property of reducing the dust resistivity. The alkali content of preheater exit gas reduces
because most alkalis get condensed at the cold raw meal feed or the top cyclones, unlike
long dry kiln processes where they used to condense in ESP