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Bauxite
is the principal raw material in the production of aluminium.
Some of the other uses are in production of aluminous
cements, slag adjuster in Iron industry and as an ingredient
in the production of Portland cements.
Bauxite
is a raw material consisting mainly of alumina-bearing
hydroxides; oxides of iron, silicon and titanium with
impurities of Ca, Mg, Cr, V, P, Ga and other elements.
Basic alumina containing minerals of bauxites are gibbsite
Al(OH)3, boehmite g-AlO(OH) and diaspore a-AlO(OH).Besides,
bauxites contain minerals of iron: hematite a-Fe2O3,
goethite a-FeO(OH); silica as quartz a-SiO2 and kaolinite
Al2[Si2O5](OH)4; titanium dioxide as anatase and rutile.
Carbonates of Ca & Mg, Sulphur, impurities of organic
substances are also present in smaller quantites in
Bauxite.
The
quality of bauxites for alumina production is estimated
by the contents of Al2O3 and SiO2, and also by the mineral
form of aluminium oxide. Ashapura Bauxites are gibbsitic
in nature and allow producing metallurgical grade alumina
with minimal expenses.
High
quality Ashapura bauxites are successfully used for
metallurgical grade alumina production besides applications
in the cement industry, alumina chemical, steel, alum,
emery industries, flame-retardants etc.
The
processing of these bauxites is done at a number of
alumina refineries in the world. Ashapura bauxites can
be processed at a low-temperature autoclave digestion
(155ºC). They can be used also for sweetening stage
and for non-autoclave digestion in agitators (105ºC).
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