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Normal soda
course aluminas
Calcined aluminas are widely used in
refractories and in the ceramic industry.
Their specific properties include extreme
hardness, refractoriness, high mechanical
strength and resistance to wear abrasion,
chemical attack, and corrosion. These
are used as feed material for fused
alumina, refractory aggregates, etc.
Coarse alumina grades are white crystalline
powders that are predominantly alpha
alumina of high chemical purity and
consistent physical properties. These
products have excellent grindability.
Chemical
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Medium and low
soda course aluminas
Medium and low soda course alpha aluminas
consist of friable aggregates of crystallites
having easy grindability and are used
in the manufacture of wear-resistant
ceramic liners, as well as in industrial
ceramics and electrical insulators.
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Medium and
low soda fine aluminas
Medium and low soda fine aluminas are
predominantly in the alpha phase, with
controlled particle-size distribution.
They are widely used in special refractory
bricks and shapes, refractory gunning
mixes, wear-resistant ceramic parts, ceramic
liners, grinding media, HVDC / HVAC insulators,
etc., when used for high-temperature applications.
These low soda grades provide excellent
hot strength to the refractory body.
Chemical
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Normal soda
fine aluminas
These are predominantly fine, alpha aluminas
of about 5µm with controlled particle-size
distribution. They are widely used in
high-alumina refractories, concast shapes,
grinding media, high-tension insulators,
ceramic liners, etc.
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Reactive fine
aluminas
These grades are predominantly alpha aluminas
having wider particle-size distribution.
They yield a low water demand with very
good flow properties when used in low-cement
castables, ULCC and self-flow refractory
mixes. They are also recommended for usage
in grinding media, wear resistant ceramic
components and liners, owing to their
superior packing characteristics.
Chemical
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properties | Ceramic
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Reactive aluminas
— ultrafine
These reactive alumina grades are white
crystalline alpha alumina powders developed
for specialised ceramic and refractory
applications. These aluminas are characterised
by high reactivity, low water absorption
and controlled particle-size distribution.
Typical applications include low cement
and ultra-low cement castables, slide
gates and refractory bricks, resistor
cores, new generation ceramics and wear-resistant
ceramic parts.
Chemical
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properties | Ceramic
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Polishing aluminas
These grades are developed through controlled
calcination and processing in order to
obtain consistent particle hardness, shape
and size distribution. They provide a
choice of oil absorption values within
the product range. These are recommended
for use in solid bars, emulsions and pastes
for metal and stone polishing applications.
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Coarse
alumina hydrates
Alumina hydrate, which is also termed
as aluminium hydroxide and alumina trihydrate,
is a crystalline white powder with the
chemical formula Al2O3·3H2O
or Al(OH)3. These hydrates
are available in both moist and dry forms.
Coarse alumina hydrates are recommended
in the manufacture of aluminium sulphate
(alum), PAC (Poly Aluminium Chloride),
zeolite, aluminium fluoride, glass, etc.
Chemical
properties | Physical
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Fine
alumina hydrates
These are fine white powders, with average
particle size ranging from 5 to 15µm.
They are used as fillers in paper and
in SMC / DMCs; they also function as flame
retardants in latex, rubbers, plastics,
etc.
Chemical
properties | Physical
properties |
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Click here for
information on alumina minerals
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