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PROCESS |
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The process aims at converting the raw material to
MULLITE forms which has general formula 3Al2O3
, 2Sio2 by calcining at a temperature of
about 1300oC to 1400oc in kiln. |
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no evolution of gases like Co2 or other
volatiles from the raw material . |
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The main objective of
calcining ore is to attain thermal stability by Gradual
and slow heating. |
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Process |
Kyanite is not found in pure state. It is contaminated
by:
1 - Tourmalene (Forrogenous Kyanite
with 6 to 8% Fe2o3)
2 - Mica
3 - Free Silica |
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Tourmaline Kyanite |
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Our process aims at reducing impure Tourmalene Kyanite
to paramagnetics and magneting the Calcined Product. As
the calcinations is carried out in the reducing
atmosphere the Fe2o3 in Tourmalene
Kyanaite is reduced to Feo by the reaction Fe2o3+C
Co+Feo. This forms a magnetable flux with alkalies
present. After calcinaton, the lumps are crushed to the
desired size as per order and passed through High
Intensity Magnet of 11000 gauss. The tourmalene Kyanite
is magnetted out. |
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Mica |
Mica also melts with the
alkalies present in Tourmaline Kyanite and gets magneted
out along with Tourmalene Kyanite. If however, some mica
is left out, it is separated by air classification.
Free Silica – In the initial
stages of calcination up to 1100oc, the Sio2
reacts with carbon as under: |
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Sio2 + C -> CO + Sio |
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In the last stage of calcinations above 1350oC
the Sio is again converted to Sio2 fines and
thrown out due to the air current - Sio+O2 ->
Sio2. The end product, in the desired size,
is free of Tourmalene Kyanite/Mica alkalies and part of
free silica. This gives a boost to the Al2O3
percentage |
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Product Range |
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Calcined Kyanite / Calcined Sillimanie and Calcined
Pyrophillite |
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Available Sizes |
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1 - 3 mm, 0 -1 mm, 3 - 5 mm |
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Mesh Sizes |
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10/16, 16/30, 30/50, 50/80 and 200 Mesh Or as required
by the customer |
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