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%to88%.the heating is carried out in rotary kilns.
Bauxite test indicators:
High-alumina (containing more than Al2O385%) requires inspection items:
Al2O3: refractory grade above 85 to 87 percent, 86 percent above the level grinding, welding and above 87%;
SiO2: refractory grade 6 to 7% or less, grinding stage 5 to 6% or less;
Fe2O3: refractory grade 1.6 to 2% or less, wear-level of 2% or less;
TiO2: refractory grade 3.5 to 4% or less,
Welding grade bauxite and some also require inspection and phosphorus, sulfur, manganese and other projects;
BD (bulk density): refractory grade 3.10 ~ 3.20g / cm3 or more, ground level, this test does not require welding class;
L.O.I (loss on ignition): both 0.3%;
Calcined Bauxite Applications:
1. Aluminium metallurgy
2. Precision casting / Investment casting:
bauxite grog fines can be made into mold for precision casting.
3. Refractory: high alumina bauxite’s refractoriness can reach 1780°C.
It is charactered by good chemical stability and mechanical performance. (Al2O3 ≥48% with low Fe2O3)
4. Aluminium silicate refractory fiber: The high alumina bauxite grog can melt under 2000°C-2200°c in the electric arc furnace.After a series of processing, it can become aluminium silicate refractory
fiber, which can be made into fiber blanket, plate,cloth.
5. Mixing magnesia and bauxite grog with binders to pour the molten steel ladle for better overall
6. Producing bauxite cement
8. Ceramics industry
9. Chemistry industry for all kinds of aluminium compound.
Packaging & Shipping
1-3mm Calcined bauxite rotary kiln for sale
1. 25/50 kg plastic woven bag with liner
2. 1 MT jumbo bag with double layer
3. It can be customized.
4.Storage and transportation Note: Keep dry
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Currently, the country has known occurrence of bauxite 49. China is rich in bauxite resources, about 37 million tons, ranking in the world, and Guinea, Australia, Brazil belong to the world's bauxite resources in the country. But the state high bauxite production of refractories used only for Guyana and China, bauxite high iron content in other countries, and more for aluminum and abrasive materials.
China is rich in bauxite resources in the country 18 provinces, autonomous regions and municipalities have been identified bauxite origin of 205, including 72 major origin (excluding Taiwan). Mainly located in Shanxi, Shandong, Hebei, Henan, Guizhou, Sichuan, Guangxi, Liaoning, Hunan and other places.
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