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Al2O3 85% Rotary Kiln Calcined Bauxite for Refractory Castables (aluminous soil; bauxite), also known as alumina or bauxite, hydrated alumina containing impurities, main component is its composition of alumina is extremely complex, a variety of geological sources vary the floorboard of the hydrous alumina ore.As water soft diaspore, monohydrate hard diaspore and sanshui diaspore (Al2O3 · 3 h2o);Have a plenty of diaspore and kaolinite (2 sio2, Al2O3, 2 h2o) company;Some is given priority to with kaolinite, and with higher content of kaolinite, the form for general bauxite or kaolinite clay.Bauxite is generally formed by the chemical weathering or exogenous, there are few pure mineral, mineral always contains some impurities, more or less contain clay minerals, iron ore, titanium minerals and clastic heavy minerals, etc.
Calcined bauxite is one of the principal ore of aluminum. Calcined bauxite contains hydrous aluminum oxides and aluminum hydroxides, formed through the laterization of aluminous rocks in tropical and subtropical areas .calcined bauxite is obtained by calcining (heating)superior grade bauxite at high temperature (from 85OC to 1600C) .this removes moisture thereby increasing the alumina content. compared to an alumina content of about 57%to 58%in raw bauxite, calcined bauxite has an alumina content of 84%to 90%.the heating is carried out in rotary kilns.
|
Item |
Chemical Composition |
Density g/cm³ |
Water absorption % |
||||
|
AL2O3 |
Fe2O3 |
TiO2 |
CaO+MgO |
K2O+Na2O |
|||
|
GAL-88 |
≥88 |
≤1.5 |
≤4.0 |
≤0.4 |
≤0.4 |
≥3.15 |
≤4 |
|
GAL-85 |
≥85 |
≤1.8 |
≤4.0 |
≤0.4 |
≤0.4 |
≥3.10 |
≤4 |
|
GAL-80 |
≥80 |
≤2.0 |
≤4.0 |
≤0.5 |
≤0.5 |
≥2.90 |
≤5 |
|
GAL-75 |
≥75 |
≤2.0 |
- |
≤0.6 |
≤0.6 |
≥2.65 |
≤5 |
|
GAL-70 |
≥70 |
≤2.0 |
- |
≤0.6 |
≤0.6 |
≥2.60 |
≤5 |
|
GAL-60 |
≥60 |
≤2.0 |
- |
≤0.6 |
≤0.6 |
≥2.50 |
≤6 |
|
GAL-50 |
≥50 |
≤2.5 |
- |
≤0.6 |
≤0.6 |
≥2.45 |
≤6 |
|
GAL-40 |
≥40 |
≤3.5 |
- |
≤0.6 |
≤0.6 |
≥2.30 |
≤6 |
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