Brown corundum is made of natural bauxite as raw material, carbon (mainly coke) is used as reducing agent, and iron filings are added as sedimentation agent (clarifier) to form ferrosilicon deposited on the bottom of electric furnace.
Brown fused alumina for conventional abrasive
Brown corundum is made of natural bauxite as raw material, carbon (mainly coke) is used as reducing agent, and iron filings are added as sedimentation agent (clarifier) to form ferrosilicon deposited on the bottom of electric furnace.
Brown fused alumina is tan, generally A12O3≥94.5%, SiO2≤3.5%, TiO2≤3.5%, FeO3≤1%. The mineral composition is mainly a-Al2O, the central part of the crystal shape is rhombus, thick plate and cracked particles, and there are many silicon oxide and calcium oxide melt crystals around, which are long plate-like, and the coarsest grains are Skeletal platelets. Due to miscellaneous
The quality has not been completely removed, so brown fused alumina also contains secondary crystalline phases such as rutile, as well as glass phases, iron alloys and solid solutions. The hue of brown corundum depends to a large extent on the titanium oxide remaining in the product.
Brown fused alumina is mainly used as abrasive. In recent years, it has been used as an aggregate for large and medium-sized blast furnace tap ditch castables and anhydrous tap mud, and as a raw material for the manufacture of ordinary corundum bricks (including high-alumina silicon carbide bricks).
|
particle size range |
Al2O3% |
TiO2 |
CaO |
SiO2 |
Fe2O3 |
|
0-1,1-3,3-5mm |
95~97 |
1.7~3.40 |
≤0.42 |
≤1.00 |
≤0.30 |
|
F4~F80 P12~P80 |
95.00~97.00 |
1.70~3.40 |
≤0.42 |
≤1.00 |
≤0.30 |
|
F90~F150 P100~P150 |
94.50~97.00 |
||||
|
F180~F220 P180~P220
|
94.50~97.00 |
1.70~3.60 |
≤0.45 |
≤1.00 |
≤0.30 |
|
F230~F800 （P240~P800）
|
≥93.5 |
1.70~3.80 |
≤0.45 |
≤1.20 |
≤0.30 |
|
F1000~F1200 （P1000~P1200） |
≥93.00 |
≤4.00 |
≤0.50 |
≤1.40 |
≤0.30 |
|
P1500~P2500 |
≥92.5 |
≤4.20 |
≤0.55 |
≤1.60 |
≤0.30 |
|
F4~F80 P12~P80 |
≥94.00 |
1.50~4.00 |
≤0.50 |
≤1.40 |
- |
|
F90~F150 P100~P150 |
≥93.00 |
1.50~4.00 |
≤0.50 |
≤1.40 |
- |
|
F230~F800 （P240~P800）
|
≥92.50 |
≤4.20 |
≤0.60 |
≤1.60 |
- |
|
F1000~F1200 （P1000~P1200） |
≥92.00 |
≤4.20 |
≤0.60 |
≤1.80 |
- |
|
P1500~P2500 |
≥92.00 |
≤4.50 |
≤0.60 |
≤2.00 |
- |
White corundum is made from industrial alumina powder, which is smelted in an arc at a high temperature above 2000 ℃ and then cooled. After crushing and shaping, magnetic separation to remove iron, it is divided into various particle sizes.
Brown Fused Alumia powders are fused wIth premium raw materials and 3500 KVA furnace. It is perfect material specifically manufactured to be used for general abrasive applications in bonded abrasive tools, polishing and sandblasting grit. It has lower hardness and abrasive capacity than diamond, boron carbide, and silicon carbide, it is widely used for grinding ferrous materials, finishing tough and hard materials. It is also be used as high-class refractory materials. Brown Fused Alumia is offered in macro and micro powder form, in both F and P grades.
Silicon carbide used in industry is a synthetic material, commonly known as emery. Silicon carbide is one of the most commonly used non-oxide refractory raw materials in the field of refractories.
Corundum bricks are mainly used in iron-making blast furnaces and blast furnace hot blast furnaces, refining furnaces outside steel-making furnaces, sliding water heaters, glass melting furnaces and petrochemical industrial furnaces, etc.
Chrome corundum brick refers to corundum refractory products containing Cr2O3. At high temperature, Cr2O3 and Al2O3 form a continuous solid solution, so the high temperature performance of chromium corundum products is better than that of pure corundum products. Chromium corundum products are widely used, and the content of Cr2O3 is mostly in the range of 9% to 15%.
low porosity clay bricks are mainly used in the regenerators of glass kilns. They can also be used in blast furnaces and hot blast furnaces in the steel industry; cement kilns in the building materials industry; chemical kilns in the chemical industry as kiln linings
Corundum self flowing castable is a high-tech product developed according to the theory of solid fluid and combined with the application characteristics of refractory materials, which is the first in China. The corundum self-flowing material can be degassed and leveled without vibration with the help of its own gravity, so as to achieve densification.
The chemical composition of bauxite is mainly Al2O3, SiO2, Fe2O3, TO2, accounting for about 95% of the total composition, and the secondary components are CaO, MgO, K2O, Na20, S, MnO2 organic matter and trace components Ga, Ge, etc.
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