The sintered material discharged from the rotary kiln is known as the clinker. A reciprocating
grate cooler is largely used for cooling of clinker from a temperature of around 1200C–70C. This is done by blowing air, cross-current, through the grates. A part of the
hot air coming out from the grate cooler is used as secondary combustion air in the kiln or
for raw meal drying in the grinding mills, the rest is cleaned in ESP. On the basis of data tabulated
in Table 4 and other laboratory/plant observations, the following dust characteristics
can be delineated.