PAKISTAN STEEL’S RAILWAY
DEPARTMENT.
Pakistan
Steel has its own railway department provided with Soviet make Locomotives,
gandolas and bogies as an integral part of the project. Pakistan steel’s
railway department has its own repair and maintenance locomotive workshop
within its premises.
The
Blast furnace molten slag is dispatched through specially designed slag cars to
slag dump yard for onward processing to make it salable to market..
Specially
designed bogies are used for transportation of molten pig iron ladles from iron
making department to steel making
department and to pig casting machine.
Self
tilting Torpedo vessel provides the following major advantages over usage of
hot metal ladles:
-
Reduces
the huge loss of Physical temperature of hot metal ( enormous energy ) due to
transportation and handling of hot metal ladles between Iron making and Steel
making departments which could be preserved & utilized for melting additional
amount of scrap in LD-Converter.
-
Eliminates the number of pig iron ladles and their
maintenance cost. Torpedo vessel of capacity 300 tonne may take the hot metal
of two consecutive tappings of Blast furnaces of the existing volume of B.F. of Pakistan Steel.
-
Eliminates
the excessive use of overhead charging cranes in steel making department for
pouring pig iron ladles into / out of 1300Ton Mixer. Self tilting torpedo
vessel directly dispenses molten pig iron into converter charging ladle thereby
reduces the time of Overhead charging cranes to half. This would help to
enhance the efficiency and hence the production capacity of steel making
department.
-
The
usage of torpedo vessel is expected to save the temperature of hot metal 80-1000C
which reduces the amount of hot metal required per (batch) heat and allows more scrap convert to steel. A vessel of capacity
300 tonne may be sufficient for three consecutive batches ( heats) of 130 tonne
charge (Scrap + Hot metal) of LD-Converter and may eliminate the use of hot
metal storage vessel ( 1300 ton Mixer) and its yearly Capital repair cost in steel making
department.
Few
steel plants have used Torpedo vessels for pre-treatment of hot metal to remove harmful
elements Sulphur, Phosphorus and Silicon but these operations tend to decrease the
physical temperature of hot metal and cause the excessive wear/ consumption of refractory
lining of the Torpedo vessel and substantial increase in cost of operation. The
said chemical elements in hot metal at Pakistan Steel are kept controlled
within required limits through control of Blast furnace charge materials as
such pretreatment of hot metal would not be needed currently.
Provision
of this energy efficient hot metal transport vessel may be deemed as a part of future revamp
package (Phase- II expansion program). Briefly the addition of Torpedo vessel facility
will be needing modification of existing
Blast furnace Cast house platform, utilization of space available for
installation of second 1300 tonne Mixer at steel making department, up
gradation of rail track and hauling capacity between Blast furnace and
steelmaking department to endure the heavy load of this huge transport vessel.
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