SINTERING PLANT (Pakistan Steel).
Sintering
is the agglomeration of fines of iron ore, manganese ore, coke breeze,
limestone and dolomite along with recycled metallurgical wastes mineral
particles into a lumpy porous mass by heat of combustion of fine coke added within
the mass itself.
This
agglomerated or lumpy mass combines
efficiently in the Blast furnace charge and allow more consistent and controllable
iron manufacture.
Pakistan Steel’s sintering plant is comprised
of two sintering machines. Sintering
Machine is a ( 4
meter wide and 100
meter long ) continuous circulating heat resistant steel belt (made up of 92
pellet cars or wagons linked together).
To obtain a desired product chemistry, the proportioned raw
materials are obtained from 12 bunkers, sided in 2 rows which are mixed and moistened
in a mixing drum. Then the raw material is passed through the shuttle conveyor
into the hopper where it drops into the baling drum for mixing. The material bed depth over the grate
is kept constant by adjusting the cut-off plate which is fitted with probes to
sense the depth of material and automatically vary with the roll feeder speed.
The raw mix is ignited by the ignition hood, fuelled by a
mixture of coke oven gas, blast furnace gas and sometimes natural gas. The carbon in the charge burns to raise the
temperature (1150-1200
°C ) with the aid of the air
sucked through wind box situated under the grate by means of blower fans
at the bottom of sintering machine.
Burn-through area where the sintering
material is completely fused and
combined by the heat of combustion of coke fines to form an agglomerate.
On completion of sintering process, the sintered agglomerate is crushed
by passing it through a spiked roll crusher and cooled in the rotating circular
cooler. The cooled sinter is screened where sizes up to -20mm size are returnd back
to the sintering plant for reprocessing and sizes +20mm diameter are sent to
the discharge bunker and finally transported
to the Blast Furnace stock house through conveyor belts for
preparing the Blast furnace burden (B.F.
Charge material).
Therefore
Sintering Plant plays an important role in converting ore fines ( which may be the part of shipments of iron ore & coal
or result of in plant handling of raw materials or metallurgical waste
generated within steel plant ) into lumpy fused material chargeable in
blast furnace and hence thereby helps in reduction of coke consumption and
enhance the productivity of Blast furnace operation by reducing waste.
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