The main operating costs, other than coal costs,
are related to the
milling and
distribution of the coal to the blast furnace. LV coals,
compared to HV coals, are generally softer and thus requiring less
energy to grind, but they require a higher energy to dry the coal
down to a moisture level required to eliminate the risk of handling
problems.
Moisture in the pulverised coals can lead to
handling problems in the PF bins and transport system. Clays
in the coal may worsen the handling problems associated with
moisture.