3. The following raw materials
used in Blast Furnace for the
production of pig iron: -
(i) Iron ore
(ii) Limestone
(iii) Dolomite
(iv) Quartzite
(v) Sinter
(vi) Coke
(vii) Pellets
(viii) Coal Dust / Coal Tar
16. Processed &
Transported from
mine to plant
Steel
Plant
Blast
Furnace
Coal
Mine
Stack
Yard
Coke
Oven
Plant
Transportation by
Material Handling
System
Coke
Stack
Material
Handling
System
21. • During CARBONIZATION, coals undergo
transformation into plastic state at around 350o-
400o C, swell and then re-solidify at around
500o-550oC to give semi- coke and then coke.
• In coke ovens,after coal is charged inside the
oven, plastic layers are formed adjacent to the
heating walls, and gradually the plastic layers
move towards the centre of oven from either
sideand ultimately meet each other at the centre.
• The quality and quantity of plastic layer is of
extreme importance and it determines the
inherentstrengthof coke matrix. For producing
coke of good quality, coals should have certain
degree of maturity, good properties and wide
range of fluidity.
22. Quenching of hot coke:-
Redhotcokeformedinsideoven
pushedoutbypushercar,and
collectedonquenchingcar.
23. The Quenching car travels and placed below the quench tower. The coke is
treated to high-pressure water jets to cool the coke while still in the quench car.
The coke is discharged from car and crushed into pieces and stacked.
Quench
Tower
Quenching Car
with coke
37. Alltheraw materialischargedinto the
blastfurnace,from top,throughvariable
throatarmour or anyothermeans.
Thepurposeofablastfurnaceisto
chemicallyreduceandphysically
convertironoxidesintoliquidiron
called"hotmetal".
38. Theblast furnaceisahuge,steel stack lined
with refractory brick,whereironore, cokeand
limestone aredumpedintothe top, and
preheatedairisblownintothe bottom.
Therawmaterials require6 to 8hoursto
descendto the bottom of the furnacewhere
they becomethe finalproductofliquidslag and
liquidiron.
Theseliquidproductsare drainedfromthe
furnaceatregular intervals.
