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| Summary |
Slag carry-over from the furnace to the ladle is known
to result in reduced alloy and aluminium recovery, as
well as affecting the level of cleanliness in the final
steel. The RAMTAP BOS slag retention device is a widely
used and well proven product for the efficient prevention
of pre-slag carry-over into the ladle at the start of
tapping. |
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| Description |
RAMTAP is a refractory plug with an expanding coating
which is inserted into the tap hole of the BOS vessel
from the outside before tap, to prevent slag carry-over
from the vessel into the ladle. |
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| Application |
The RAMTAP plug has a diameter slightly less than the
vessel tap hole, and when inserted expands to fill the
tap hole. It is applied using a long metal pusher from
the outside just prior to tap. When in position it is
locked in place by it’s expanding properties under
temperature, and activated by heat from the furnace.
It has sufficient integrity to prevent the steel from
tapping for 3-5 seconds, and hence prevent the initial
slag entering the ladle. The RAMTAP plug is then forced
out by the weight of steel when the vessel is tilted
into the full tapping position. |
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| Function |
RAMTAP is designed to prevent the pre-slag carry-over
that results when the vessel is first tilted at the beginning
of tap. Up to 10% of the ladle slag carry-over can be
attributed to the pre-slag carry-over. When used together
with SWIMTAP, almost slag-free tapping can be achieved. |
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| Benefits |
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Improved recovery of alloying elements such as
manganese, silicon and chromium. |
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Reduced aluminium consumption and more consistent
recovery.
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Improved ladle refractory life due to reduced amount
of oxidising slag carry-over.
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Improved cleanliness of the final steel as measured
by surface defects and non-metallic inclusion levels.
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