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.
Insulation castables are mainly made up of lightweight refractory aggregates, powders, and binder additives.
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.
The unshaped refractory material used when repairing the lining of thermal equipment by spray construction method is called refractory gunning material. It is made of a refractory set with a certain particle gradation
Calcined alumina is a product obtained by calcining aluminum hydroxide at high temperature to partially or almost completely convert it into aAl2O2.
Silica brick: an acidic refractory mainly composed of tridymite, cristobalite and a small amount of residual quartz and glass phases. Its silica content is more than 94%, it has anti-acid slag erosion performance, high high temperature strength, high load softening temperature, long-term use in high temperature flower wells without deformation, but low thermal shock stability (heat exchange in water is 1-4 Second-rate).
The alumina ball is also called the high aluminum accumulation of heat ball.High alumina refractory ball is based on bauxite as the mainly raw refractory material.Adding powder and additives and anchoring agent.After proportioning, molding and high sintering to make it.The production engineering of high alumina refractory ball is similar to that of high alumina refractory brick.It should be based on the properties of raw materials,high alumina refractory ball requires production conditions and other factors to determine.
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