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The brown fused alumina produced by our company is characterized by high purity, good crystallization, strong fluidity, low linear expansion coefficient, and corrosion resistance. This product features non-detonation, non-pulverization, and non-cracking during application, making it an important raw material for the abrasives and refractory materials industries.
The brown fused alumina produced by our company is primarily made from high-quality, loose bauxite, supplemented with carbon materials and iron filings. These three raw materials are refined, melted, and reduced in an electric arc furnace at temperatures exceeding 2250℃. Following this, a secondary refining process is conducted, and impurities are removed using a high-strength magnetic separator. The refractoriness of the product is above 1850℃.
Main products: Barmac sand, double-roll sand, ball-milled molding sand, segmented sand, P sand, fine powder, and micro powder.
Scope of application:
Abrasives and Abrasive Tools: grinding wheels, abrasive belts, sandpaper, emery cloth, cutting blades, sandblasting processes, grinding, wear-resistant flooring, water jet cutting, coated abrasives, bonded abrasives, etc.
Refractory materials: castables, refractory bricks, ramming materials, slide plates, nozzles, steel ladles, furnace lining materials, precision casting, etc.
Physical properties of brown corundum
| Item | Indicator |
| Color | Dark brown (turns dark blue after calcination) |
| Hardness (Mohs) | ≥9.0 |
| Melting point(℃) | 1900 |
| Maximum operating temperature(℃) | 1750 |
| True density(g/cm³) | ≥3.90 |
| Linear expansion coefficient (0—1600℃) | 7—9 |
| Grit No. | Bulk density | Grit No. | Bulk density | Grit No. | Bulk density |
| F12 | 2.02-2.10 | F40 | 1.81-1.89 | F120 | 1.61-1.69 |
| F14 | 2.00-2.08 | F46 | 1.79-1.87 | F150 | 1.59-1.67 |
| F16 | 1.97-2.05 | F54 | 1.77-1.85 | F180 | 1.57-1.67 |
| F20 | 1.94-2.02 | F60 | 1.76-1.84 | F220 | 1.55-1.63 |
| F22 | 1.92-2.00 | F70 | 1.75-1.83 | ||
| F24 | 1.90-1.98 | F80 | 1.73-1.81 | ||
| F30 | 1.88-1.96 | F90 | 1.71-1.79 | ||
| F36 | 1.87-1.95 | F100 | 1.64-1.72 |
Chemical indicators of brown corundum
| Purpose | Specifications | Main chemical components % | Magnetic material% | ||||
| Al₂O₃ | Fe₂O₃ | SiO₂ | TiO₂ | ||||
| Abrasive tools | F | 4#—80# | ≥95 | ≤0.3 | ≤1.5 | ≤3.0 | ≤0.05 |
| 90#—150# | ≥94 | ≤0.03 | |||||
| 180#—240# | ≥93 | ≤0.3 | ≤1.5 | ≤3.5 | ≤0.02 | ||
| P | 8#—80# | ≥95.0 | ≤0.2 | ≤1.2 | ≤3.0 | ≤0.05 | |
| 100#—150# | ≥94.0 | ≤0.03 | |||||
| 180#—220# | ≥93.0 | ≤0.3 | ≤1.5 | ≤3.5 | ≤0.02 | ||
| W | 1#-63# | ≥92.5 | ≤0.5 | ≤1.8 | ≤4.0 | — | |
| Refractory material | Grains | 0-1-3-5-8-12 mm | ≥95 | ≤0.3 | ≤1.5 | ≤3.0 | — |
| 25-0mm 10-0mm 50-0mm 30-0mm | ≥95 | ≤0.3 | ≤1.5 | ≤3.0 | — | ||
| Fine | 180#-0/200#-0、320#-0 | >94.5/ ≥93.5 | ≤0.5 | ≤1.5 | ≤3.5 | — | |
Note:
F refers to the specifications for consolidated abrasives and sandblasting
P is the specification for coated abrasives
W refers to micro powder, and 320# refers to W40
The granularity can also be processed according to customer requirements.
If you have other special performance requirements, please contact us for specialized customized production.
