Calcined Bauxite

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 88%.the heating is carried out in rotary kilns.

Chemical Specification:
Rotary Kiln Calcined Bauxite

GradeAL2O3FE2O3TIO2K2O+Na2OCaO+MgOBulk density
7575min≤3.0≤4.0≤0.3≤0.5≥2.70
8080min≤3.0≤4.0≤0.3≤0.5≥2.80
8585min≤2≤4.0≤0.3≤0.5≥3.00
8686min≤2≤4.0≤0.3≤0.5≥3.10
8787min≤2≤4.0≤0.3≤0.5≥3.20
8888min≤1.8≤4.0≤0.25≤0.5≥3.25
9090min≤1.8≤4.0≤0.25≤0.5≥3.30

Classification Introduction:

1.Classified according to the type of bauxite raw materials:

(1) raw bauxite, alumina original ore (natural sedimentary rock class).
(2) the calcined bauxite, the raw bauxite after high temperature calcination (1200 ~ 1700 ℃) is called the calcined bauxite.

2.Calssified according to the different calcining kiln where the bauxtie is divided into:

 (1)Shaft kiln bauxite
 (2)Rotary kiln bauxite
 (3)Round kiln bauxite

3.Calcined Bauxite according to different uses for division:

 (1) the refractory grade bauxite
 (2) the grinding grade alumina
 (3) the welding grade bauxite

Usage:

1, aluminium industry, used for national defense, aerospace, automotive, electrical, chemical industry, daily necessities, etc.

2, precision casting, bauxite clinker made after mold precision casting processed into fine powder, used in military industry, aerospace, communications, instrumentation, machinery and medical equipment department.

3, used for refractory products – high bauxite clinker as high as 1780 ℃, refractoriness strong chemical stability, good physical properties.

4, aluminum silicate refractory fiber with light weight, high temperature resistance, good thermal stability, low thermal conductivity, heat capacity is small and the advantages of resistance to mechanical shock. Used in iron and steel, nonferrous metallurgy, electronics, petroleum, chemical, aerospace, atomic energy, defense and other industries. It is the high alumina clinker in the melting temperature of about 2000 ~ 2200 ℃ high temperature electric arc furnace, via high pressure of high temperature melting, high-speed air or steam injection, cooling, became a white cotton – silicate aluminum refractory fiber. It can be pressed into fiber blanket, board or woven cloth instead of smelting, chemical industry, glass and other industrial furnace lining brick. Firefighters available refractory fiber cloth to make clothes.

5, magnesia and bauxite clinker as raw material, adding proper binder, used for pouring ladle whole ladle lining has particularly good effects.

6, manufacture alumina cement, abrasive materials, ceramic industry and chemical industry can be of aluminum compounds.

Packing and storage  

Packing: Double coated plastic woven / paper bag, net weight 25kg.
Big bag packing, net weight 1000kg / 1250kg per clients’ request.
Storage: Dry, ventilated, moisture proof.

Calcined Bauxite Tags:
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