Ladle
Refining Furnaces are basically used for refining the molten metal and we must
note it that this is the best technology for manufacturing the alloy steel.
Ladle Refining Furnaces are applied for de-sulphurising the molten metal and
also for removing the impurities from molten metal.
Ladle
refining furnace holds the liquid metal for process of casting. Before Ladle
Refining treatment there will be melting process which could be processed
either in electric arc furnace or in the Induction Melting Furnaces.
In absence
of LRFs, There will be requirement of higher tapping temperatures from steel
melting or steel making furnaces. Now questions are generally being asked why
so much tapping temperature are required?
This is
only because there will be loss in heat during travelling of liquid metal and
during casting process also. LRF helps for better productive time for melting
furnace as well as also producing much better quality of steel even at lower
budget.
In case of
ladle furnace, there will be one stand which is known as ladle stand and ladle
filled with liquid metal will be placed over ladle stand under one cover, this
cover will be provided along with 3 graphite electrodes and this graphite
electrode will be connected with a transformer of 3 phase type.
Ladle bottom
portion will have refractory (porous) plug and there will be one provision of
argon supply also at the ladle –furnace (LF) stand.
For
environmental safety point of view, there will be one hood cover which will be
water cooled and will be connected with dust collection system. This hood cover
will suck the fumes of ladle refining furnaces and will send to dust collection
system after cooling during its runway.
There will
be formation of one layer of desulfurizing slag over molten metal and the
graphite electrodes will be submerged in this desulfurizing slag for protecting
the lining of ladle because due to overheating of lining by the process of
electric arc, ladle lining used to wear rapidly.
Note:
Picture
source
The
process of addition of alloying elements might be done via addition hopper.
Advantage of Ladle Refining Furnace
- Efficient desulfurization
- Reheating process will be under controlled
- Temperature and chemical homogenizing;
- Easily removal if there is any metal inclusion
Let
us move towards next post
what are the disadvantages of ladle furnace????
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