Dense Fused Alumina is a high-grade refractory material produced by melting high-purity alumina with a certain proportion of reducing agent in an electric arc furnace. It is grayish-white or light brown in color, with alumina as its main component. After melting, crystallization, cooling, crushing, and sieving, the fused product is processed into particle sizes suitable for use in the refractory industry.
Physical and Chemical Specifications
| Physical & Chemical Indexes | Al₂O₃ (%) | SiO₂ (%) | Fe₂O₃ (%) | C (%) | Bulk Density (g/cm³) | Apparent Porosity (%) |
| Guaranteed Value | ≥99 | ≤1.0 | ≤0.15 | ≤0.08 | ≥3.9 | ≤2 |
| Typical Value | 99.24 | 0.42 | 0.08 | 0.05 | 3.92 | 1 |
Advantages
(1) Composition and Structure
Dense Fused Alumina mainly consists of α-Al₂O₃, with a primary crystalline phase content higher than 96% and a porosity lower than 4%. It is light gray in color and features a high melting point and very high bulk density.
(2) Physicochemical Properties
Dense Fused Alumina exhibits excellent wear resistance, slag resistance, volume stability, and thermal shock resistance at high temperatures. It has good resistance to both acids and alkalis and can maintain stable performance under high-temperature conditions. In addition, dense corundum has relatively high thermal conductivity and good heat transfer properties.
Manufacturing Method & Applications
Dense Fused Alumina is produced by melting high-purity alumina and a reducing agent in a certain ratio at high temperature in an electric arc furnace, followed by cooling. This process ensures its high purity and low porosity.
Monolithic refractories: blast furnace trough castables, ladle castables, ramming mixes, precast blocks, etc.
Shaped refractories: refractory bricks, permeable bricks, nozzles, and well blocks, etc.
Refractory materials for industries such as ceramics, cement, and glass.
Actual factory photos
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