| Prolonged campaign life and low maintenance cost play a significant
part in the economical operation of steel making furnaces. Uninterrupted
services of hot metal mixer and open hearth furnace are essential
for augmenting ingot steel production. Since refractories in different
parts of mixer and open hearth furnace do not wear at similar
rates, some sections of the linings have to be repaired or replaced,
if maximum life is to be obtained from the remainder of the linings,
In recent years, gunning of refractories for hot repairs of the
linings of mixer and open hearth furnace is gaining importance over
conventional practice of repairing with the bricks to balance the life
of primary brick lining and to maximise the utilization of the entire
lining, and thus help lengthening the campaign life.
The paper describes as to how effective gunning could be used as an
intermediate measure for maintaining various sections, particularly
severe wear areas of mixer and open hearth linings during campaign
running. Maintenance by gunning is a dynamic process which
reduces repair time, labour cost and heat loss beside resulting in the
saving of costly basic refractories. |
