The Difference Between BFA And WFA
| WHITE FUSED ALUMINA FINES | ||
|---|---|---|
| WFA(FINES) | SPECIFICATION | MIN/MAX |
| AL2O3 | 98.90% | MIN |
| FE2O3 | O.30% | MAX |
| NA2O+K2O | O.70% | MAX |
| SIO2 | 0.20% | MAX |
| Refractory Cement | ||
|---|---|---|
| CA50 | SPECIFICATION | MIN/MAX |
| AL2O3 | 50-53% | |
| CAO | 30-35% | |
| FE2O3 | 2.50% | MAX |
| SIO2 | 9.00% | MAX |
| TIO2 | 3.00% | MAX |
| SIZE | 325 MESH 90% | MIN |
1) They are different colors. Brown fused alumina (BFA) is brown and white fused alumina (WFA) is white.
2) The bulk density of BFA is (1.53~1.99g/cm3), and the true density is (3.90g/cm3). The bulk density (1.75-1.95g /cm3) and specific gravity (3.95-3.97g /cm3) of WFA were found.
3) The main raw material of BFA is bauxite, and the main raw material of WFA is aluminum oxide powder.
4) Different chemical composition. White fused alumina Al2O3 more than 99%, Na2O3:0.3%. Brown fused alumina Al2O3: more than 90%, tertiary Al2O3 content more than 85%.
5) BFA refractory temperature 1850°C, WFA refractory temperature 2100°C.
6) Although they have a Mohs hardness of 9.0, WFA is harder than BFA, and BFA is more flexible than WFA.
Both are materials for refractory applications (mortars, crucible, amorphous refractories) or abrasive products (grinding wheels, cutting wheels, turning plates, polishing media, sandblasting media). The content of both materials is alumina (Al2O3).
1, they are different colors. Brown fused alumina (BFA) is brown and white fused alumina (WFA) is white.
2, BFA is made of bauxite and other raw materials in electric arc furnace, WFA is made of calcined aluminum oxide powder in electric arc furnace.
3, the Al2O3 content of BFA is about 95%, and the content of WA is more than 99%
4, WA is harder than BFA, although they are both hard (hardness 9), while WFA is more fragile.
The similarities between the BFA and WFA are as follows:
Two basic minerals: α-Al2O3
Two PH values: Neutral
The maximum usable temperature of both in the air is 1900 degrees Celsius and the decomposition point is 2250 degrees Celsius.
The main chemical composition of the finished product is: Al2O3
The two main applications are: refractory and abrasive products.
Both Mohs hardness: 9.0,
The difference is as follows:
The bulk density of BFA is (1.53~1.99g/cm3), and the true density is (3.90g/cm3). WFA packing density (1.75-1.95g /cm3) and true density (3.95-3.97g /cm3).
The main raw material of BFA is bauxite, and the main raw material of WFA is calcined aluminum oxide powder.
The Al2O3 content of BFA is more than 95% and the Al2O3 content of WFA is more than 99%.
The fire resistance temperature of BFA is 1850 degrees Celsius, and the fire resistance temperature of WFA is 2100 degrees Celsius.
Although they have a Mohs hardness of 9.0, WFA is harder than BFA, and BFA is more flexible than WFA.
