Ore handling plant
OBJECTIVES OF OHP: -
1. To reduces interferences of internal traffic movements and to unload raw material.
2. Blending by making homogenous pile of raw material.
3. Keeping buffer stock of raw material and their uninterrupted supply.

THE RAW MATERIAL ARE TRANSFERRED TO CONSUMERS SUCH AS: -
• Iron ore fines to SP2 & SP3.
• Iron ore to blast furnace.
• Low silicon limestone to RMP2 & SMS2.
• High silicon dolomite to SP2, SP3 & SMS2.
EQUIPMENTS
• PADDLE FEEDER
• WAGON TIPLLER
• PUSHER CAR
• STACKER
• BLENDER BARAL RECLAIMER
• TRANSFER CAR
• EXCAVATOR
• TRAVELING FEED BINS
• TRIPLER CAR
• CRANE (EOT)
• DOZER
• 3D EXCAVTOR



Blast furnace
There are 2 main section of the department:
1. Raw material section
2. Furnace section

Raw material section:
. The raw materials used for the production of pig iron are:
. Coke (fuel), Iron Ore, Sinter (Fe-bearing material), Limestone (Flux) & Mn-Ore and Quartzite (additives).
Furnace Section:
. Blast Furnace is a vertical shaft furnace, enclose in a welded shell, lined with fire-clay bricks of high alumina content.
. The walls of the furnace top are protected by steel refractory lined plates cooling the shaft,
TOP CHARGING EQUIPMENT
The bell type chaging device (exhisting in BF 1,2 & 3) has a big bell, small bell with hoppers, gas seal, and receiving hopper; and receives raw material from an oval shaped receiving hopper. In BF-3 RCU (Rotating Charging Unit) is provided, by means of which charging can be distributed in desired sector inside the furnace BFs. #4,5,6 & 7 are equipped with paul gate, upper sealing valve, lower material gate and lower sealing valve. This system also has a gearbox to operate a rotating chute. The latter distributes the material inside the furnace peripherally in different rings. This facilities better distribution of charge inside the furnace.

CHARGING PROGRAMME: -
To facilitate smooth working of furnaces, the following charging programme is normally practiced.
‘A’. Programme COC / COOCC / CCOOC
‘B’. Programme CCOO
Each charging cycle consist of 3 programmes of A & B exclusively or in combination depending on peripheral conditions. Generally in Bell-less Top Furnace the programme selected is ‘B’ i.e. CCOO, C=COKE; O=NON-COKE i.e. ore, sinter, Mn ore, lime atone or quartzite.

STOVES
Form bottom of the furnace the hot blast is blown into the furnace through tuyers with the help of turbo-blowers & hot blast stove.
Blast of Air reaches as follows:
Cold blast CB Main Stoves HB Main Bustle pipe Gooseneck pipe Tuyer stock Furnace.

FLUSHING OF SLAG: TAPPING AND DISPOSAL OF HOT METAL
. The furnace is provided with a tap hole, which is enclosed in a steel cast frame and is cooled by two Tap hole coolers, which have their own supply of water.
. The hot metal is tapped out at an interval of 1-2 hrs depending upon the furnace condition.
. The usual way of opening the tap hole is to drill the tap hole until the skull is reached. Oxygen lancing is carried out melt the skull.
. The hot metal continues to flow down the bend runner form, which it is diverted into individual metal ladles.