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Brown Fused Alumina, also called Brown aluminum oxide, made of high-quality abrasive grade bauxite as raw material, together with auxiliary materials, refined in an electric arc furnace at a high temperature above 2250 ºC. After the secondary refining, the impurities are removed by a high-intensity magnetic separator, and the refractoriness of the BFA is above 1850 °C . It has high purity, good crystallization, strong fluidity, low coefficient of linear expansion and corrosion resistance. The product has the characteristics of no explosion, no pulverization and no cracking during the application process, and is widely used in the abrasives and refractory raw material industries.
By smelting type:
- Tilting furnace
- Fixed Furnace
By crushing type:
- Barmac
- Rolling
- Ball milling
By Al2O3:
- 95% Al2O3 Grade A Brown aluminum oxide
- 92% Al2O3 Offset A Brown aluminum oxide
- 85% Al2O3 Grade B Brown aluminum oxide
- 60% Al2O3 Grade C Brown aluminum oxide
- F sand for Bonded Abrasives
- P sand for coated Abrasives
By Additional treatment:
- Middle temperature calcined Brown Fused Alumina ,
- High temperature calcined Brown Fused Alumina ,
- Coated Brown Fused Alumina
- High temperature calcined & coated Brown Fused Alumina (AHMCF)
What Is Difference Between Tilting Furnace Melted & Fixing Furnace Melted ?
Ball Milling & Barmac Process?
1. Tilting furnace process affects SiO2, SiO2 <1% by Tilting furnace, SiO2 <1.5% is by fixed furnace.
2. Barmac affects the density, the grain shape is rounder & the density is greater than ball milling
3. The Tilting furnace made BFA has high Al2O3 content
4. The corundum has good toughness & more suitable for abrasive products by dumping furnace process
| Chemical Analysis | Brown Fused Alumina Tilting furnace | Brown Fused Alumina Fixed Furnace |
| Al2O3 | 95,65% | 94,20% |
| TiO2 | 2,42% | 2,79% |
| Fe2O3 | 0,12% | 0,33% |
| SiO2 | 0,92% | 1,34% |
| CaO | 0,35% | 0,33% |
| Hardness | 9 Moh | |
| Melting point | 2250 °C | |
| Specific gravity | 3,9 - 4,1 g/cm3 | |
| Bulk density* | 1,5 - 2,1 g/cm3 | |
| Grit No. | Bulk Density | Grit No. | Bulk Density |
| F12 | 2.02-2.10 | F60 | 1.76-1.84 |
| F14 | 2.00-2.08 | F70 | 1.75-1.83 |
| F16 | 1.97-2.05 | F80 | 1.73-1.81 |
| F20 | 1.94-2.02 | F90 | 1.71-1.79 |
| F22 | 1.92-2.00 | F100 | 1.64-1.72 |
| F24 | 1.90-1.98 | F120 | 1.61-1.69 |
| F30 | 1.88-1.96 | F150 | 1.59-1.67 |
| F36 | 1.87-1.95 | F180 | 1.57-1.67 |
| F40 | 1.81-1.89 | F220 | 1.55-1.63 |
| F46 | 1.79-1.87 | F60 | 1.76-1.84 |
| F54 | 1.77-1.85 |
The difference between F-grit & P-grit Abrasive grains:
F-grit is more suitable for bonded abrasive tools.
P-grit is more suitable for coated abrasive tools. It is with a closer tolerance size distribution, lower density, and better self-sharpening ability than non-P-grit abrasives, which means that they offer a more consistent surface finish.
Application Abrasives:
grinding wheel, abrasive belt, sandpaper, abrasive cloth, cutting disc,
sandblasting process,grinding, wear-resistant floor, water jet cutting, coated abrasive, bonded abrasive, etc.
Application Refractory materials:
castable, refractory brick, ramming material, slide plate, nozzle, ladle, furnace lining, precision casting, etc.
Main Applications of Brown Fused Alumina
- Make resin cutting discs,cremic grinding wheels
- Make coated abrasives such as sand belts, sand paper,flap wheels, fiber wheels...
- Blasting Media
- High grade refractories
- Anti-slip resistant materials
1) 20 years abrasive industry experiences
2) Direct Factory supply & Fixed abrasive sources
3) On-site inspection in factory for each shipment
4) Samples tests each lot in Zhengzhou Research Institute for Abrasives& Grinding Co., Ltd
Our Brown fused alumina grit has been exported to Japan, India, Israel, Russia, Poland etc.
Pls send me email to get Brown fused alumina datasheet /samples and quotation…
