Brown Aluminum Oxide
Brown Aluminum Oxide (Al 2 O 3 ) is also known as Brown Fused Alumina (BFA), named by its mainly brown color. It is produced by the fusion of high-quality Calcined Bauxite in an electric arc furnace at high temperatures greater than 2000℃. Bauxite used for producing BFA contains high Aluminum...
Brown Aluminum Oxide (Al2O3) is also known as Brown Fused Alumina (BFA), named by its mainly brown color. It is produced by the fusion of high-quality Calcined Bauxite in an electric arc furnace at high temperatures greater than 2000℃. Bauxite used for producing BFA contains high Aluminum Oxide (Al2O3). After the fusion process, the materials are mixed and fused into liquid materials, then cooled down and crushed (milled) into lump sizes. The lump sizes are then ground into finer grades or powders and refined by sieving equipment into different particle distribution materials for many applications.
Ours has high compression strength, high toughness, excellent self-sharpening, low coefficient of thermal linear expansion, good crystallization, and excellent hydrophilia and cleanliness. It is a clean, high-strength material that resists oxidation and corrosion resistance, maintains chemical stability, and withstands extraordinarily high temperatures. It has wide application range in refractory materials.
Applications
Brown Aluminum Oxide has been verified by dozens of enterprises in practice that this product has the characteristics of no detonation, no pulverization and no cracking in the application process, which makes it become the high-quality aggregate and filler of refractory materials made by brown corundum. Its thermal properties make it an excellent material for use in the manufacture of refractory products.
Bricks
Ramming and gunning mixes
Tiles
Castables
Filter Plates
Loose grain
Dense, high temperature refractory products
Packing size
Standard sizes:
Refractory Grit (mm): 0-1, 1-3, 3-5, 5-8, 8-15
Refractory Powder (Mesh): -100, -200, -325
Standard packagings:
55 lbs (25kg) woven bags; 2,200 lbs (1000kg) big bags
Typical Physical Properties
The main component of brown aluminum oxide is alumina, and the grade is also distinguished by the aluminum content, the lower the aluminum content is, the lower the hardness is.
| Specific Gravity | 3.94 g/cc |
| Melting Point | 2020 ℃ |
| Crystal Structure | α-alumina |
| Color | Brown |
| Apparent Porosity | 3.55% |
| Apparent Specific Density | 3.82 g/cm³ |
| Reversible Linear Expansion | 1.42% at 1400℃ |
Brown fused alumina bauxite as raw material, coal, iron, high temperature above 2000 degrees hitches in arc smelting, the mill grinding plastic, magnetic separation to iron, screen is divided into a variety of particle size, dense texture, high hardness, particle formed globular, high consolidation is suitable for making ceramic, resin abrasive and grinding, polishing, sandblasting, casting, etc., can also be used for manufacturing advanced refractories.
Because of its high strength and other properties, it is used to cast steel sliding nozzle, smelting rare metals, special alloys, ceramics, blast furnace lining (wall and pipe); Physical and chemical ware, spark plug, heat - resistant oxidation - resistant coating.
NY TWO refractory castables are made of refractory aggregate, refractory powder, binder, and other additives, and can be used directly or by adding the appropriate amount of water or other liquids. Once cast or gunned into place, the castable material hardens and cures to form a solid and durable refractory lining. Refractory castables can be installed using different methods depending on the specific application and equipment. Such as casting, gunning, troweling, and pumping.
Brown Aluminum Oxide (Grains) Castables 0-1mm, 1-3mm, 3-5mm
|
Characteristic |
Typical Value |
Specification Control |
|
|
Min. |
Max. |
||
|
Al2O3 |
95 |
94.5 |
-- |
|
Fe2O3 |
0.2 |
0.3 |
|
|
SiO2 |
1.3 |
1.5 |
|
|
TiO2 |
2.6 |
3.5 |
|
|
CaO |
0.3 |
||
|
MgO |
0.3 |
||
|
Magnetic Particles |
0.5 |
||
|
Hardness |
9 Mohs |
||
|
Specific Gravity |
3.8 g/cm³ min |
||
Brown Aluminum Oxide (Fines) Castables -200 mesh, -325 mesh
|
Characteristic |
Typical Value |
Specification Control |
|
|
Min. |
Max. |
||
|
Al2O3 |
93.5 |
92 |
-- |
|
Fe2O3 |
0.3 |
0.5 |
|
|
SiO2 |
1.3 |
2.0 |
|
|
TiO2 |
3.0 |
4.5 |
|
|
CaO |
0.4 |
0.5 |
|
|
MgO |
0.4 |
0.5 |
|
|
Magnetic Particles |
0.5 |
||
|
Hardness |
9 Mohs |
||
|
Specific Gravity |
3.8 g/cm³ min |
||
Brown Aluminum Oxide for refractory advantages
1) High quality bauxite as raw material
2) Refractory temperature is more than 2020°C
3) No burst, no pulverization and crack in the using course of refractory
4) Very low amount of iron oxide
Our advantages
1.We own the raw materials bauxite ore and factory, so we can control the quality and cost effectively.
2.Advanced technique and 20 years of production experience.
3.Convenient traffic.
4.Professional and efficient service.
5.ISO9001, ISO 14001, OHSAS 18001 certificates.
6.Accept OEM brand,
7.Samples for free.
Production introduction
Using bauxite and charcoal (anthracite) as raw material and fused under high temperature in an electric arc furnace. The main chemical components are Al2O3 and TiO2. It also contains small amounts of SiO2 and Fe2O3, etc. The microhardness is 1800-2200kg/mm2. The toughness is higher than Silicon Carbide. Brown fused can also make fine quality refractory, etc. The refractoriness of high-alumina clinker is up to 1850℃. It has strong chemical stability and good physical properties.
Raw Material: Exploring the Source and Composition of Brown-Fused Alumina
Brown Fused Alumina (BFA) is a dense and complex material derived from bauxite. Bauxite, the primary raw material, is an aluminum ore that consists primarily of the minerals gibbsite (Al (OH)3), boehmite (γ-AlO (OH)), and diaspore (α-AlO (OH)), mixed with iron oxides and other impurities such as silica and titania.
The process begins with the purification of bauxite, where impurities are removed through washing and screening. The refined bauxite is then calcined at high temperatures to produce alumina (Al2O3). The alumina is subsequently fused in an electric arc furnace to create Brown Fused Alumina. The final product contains about 95% Al2O3, with small amounts of iron oxide (Fe2O3) and silica (SiO2).
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