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3-6 mm Iron Oxide Fines In addition
to screening and separation of 0-3 mm iron
oxide fines, 3-6 mm iron oxide fines are
also screened and separated during the
screening process. Generation on such fines
are slightly to lesser extent compared to
0-3 mm fines and are also produced due to
handling and storage of the main oxide feed
during transportation and the difference is
only in the size.
A portion of these fines can be fed back to
the furnaces along with the main feed
depending upon process conditions and the
balance is
sold as a byproduct for use for cement manufacturing or
exported.
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Slurry Fines
During the process of production of DRI the
reducing gases coming out of the furnaces
carry along with them iron bearing dust and fines
generated and separated inside. These gases
are cleaned with process water in top gas
scrubbers and the contaminated water is
further separated into slurry and clear
water is recycled back. In a similar way gases
led with DRI dusts in the cooling zone of
the furnaces are cleaned with process water
in cooling gas scrubbers and the
contaminated water also is fed to clarifiers
to separate the dust as slurry.
The slurry is removed periodically from the
clarifiers and is a byproduct available
after natural drying as slurry fines. It has
similar composition as oxide fines and also
at present is being used in cement
manufacturing. |
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Introduction about the
Red Oxide
Red Iron Oxide is produced at the Acid
Regeneration Plant using the Spray Roasting
Technology (Ruthner Technology), to
re-generate the Hydrochloric Acid (HCl) out
of the spent acid (FeCl2) after the pickling
process. In the pickling process, the HCl
acid reacts with the scale thin film on the
hot rolled low-carbon steel strip surface
(mainly FeO and small percentages of Fe2O3 &
Fe304) and then become FeCl2. This new
composition does not react with the scale
and it has to go to the Acid Regeneration
Plant to re-produce the HCl acid and the Red
Iron Oxide (Fe203).
This Red iron oxide is having a high purity
with very less impurities, and it is used in
various industry applications like:
1. Pigment in paint manufacturing.
2. Abrasive for glass & metal polishing.
3. Coloring agent for cement tiles and brick
blocks.
And some other higher technology
application.
Production rate
Monthly about 130 MT.
Yearly about 1,500 MT. |
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Iron Oxide Fines
In the DR reduction furnace the process is
Solid-Gas reaction. In this process the
gases carry a lot of dusts which is scrubbed
in the scrubbers like Top gas scrubber and
cooling gas scrubber. Gas is cooled and
scrubbed by using enormous quantity of water
in the scrubber. The outlet water from
scrubber carry a lot of dust particles
retrieved from the gas and is contaminated
with such solid particles. This contaminated
water is treated in a clarifier to remove
solids in the water by using flocculent
which precipitates the solids to the bottom
of clarifier. The slurry enriched water is
drawn out from the bottom of clarifier and
is disposed outside.
It is taken care that a huge amount of
slurry is never present in the clarifier as
the slurry will be drawn out and disposed in
regular intervals. |
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Slurry
In the DR reduction furnace the process is
Solid-Gas reaction. In this process the
gases carry a lot of dusts which is scrubbed
in the scrubbers like Top gas scrubber and
cooling gas scrubber. Gas is cooled and
scrubbed by using enormous quantity of water
in the scrubber. The outlet water from
scrubber carry a lot of dust particles
retrieved from the gas and is contaminated
with such solid particles. This contaminated
water is treated in a clarifier to remove
solids in the water by using flocculent
which precipitates the solids to the bottom
of clarifier. The slurry enriched water is
drawn out from the bottom of clarifier and
is disposed out side.
It is taken care that a huge amount of
slurry is never present in the clarifier as
the slurry will be drawn out and disposed in
regular intervals. |
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