Phosphate Bonded High Alumina Bricks
Phosphate bonded high alumina bricks are a type of refractory product primarily made from high-alumina bauxite clinker, using phosphate solution or aluminum phosphate solution as a binder.
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Product Description
Product Description
Phosphate bonded high alumina bricks are a type of refractory product primarily made from high-alumina bauxite clinker, using phosphate solution or aluminum phosphate solution as a binder. They are formed under high pressure and undergo low-temperature heat treatment. These bricks are characterized by high strength, excellent refractoriness, superior thermal shock stability, and erosion resistance.
Key Features
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High Strength: They possess high room-temperature compressive strength and high-temperature flexural strength, enabling them to withstand significant mechanical and thermal stresses.
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High Refractoriness: With high-alumina bauxite clinker as the main ingredient, the product has a high refractoriness, reaching above 1750°C.
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Excellent Thermal Shock Stability: They exhibit good thermal shock resistance, capable of withstanding rapid cooling and heating without cracking easily.
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Good Erosion Resistance: These bricks have a certain level of resistance to both acidic and alkaline media, making them suitable for various industrial furnace environments.
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Precise Dimensions: Utilizing high-pressure molding, the product dimensions are precise, facilitating construction and masonry.
Applications
Phosphate bonded high alumina bricks are widely used in various industries and furnaces:
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Building Materials Industry: Cement kilns, glass kilns, ceramic kilns, etc.
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Metallurgy Industry: Steelmaking furnaces, steel rolling heating furnaces, soaking furnaces, etc.
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Chemical Industry: Coal gasification furnaces, coke ovens, calcium carbide furnaces, etc.
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Other Industries: Waste incineration furnaces, boilers, etc.
Production Process
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Raw Material Preparation: Crush and screen special-grade or first-grade high-alumina bauxite clinker to obtain the required particle size.
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Mixing of Ingredients: Mix high-alumina bauxite clinker, binder, and additives in proportion to achieve uniformity.
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Molding: Use a high-pressure molding machine to shape the mixed material into bricks.
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Drying: Dry the molded refractory bricks to remove moisture.
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Heat Treatment: Perform low-temperature heat treatment (approximately 500°C) on the bricks, allowing the binder to react with the raw materials and form a strong bond.
Technical Specifications
| Item | Phosphate Bonded High Alumina Brick |
|---|---|
| Al₂O₃(%) | ≥75-80% |
| Fe₂O₃(%) | ≤2% |
| Bulk Density(g/cm³) | 2.68-2.8 |
| Apparent Porosity(%) | ≤18-21 |
| Cold Crushing Strength(MPa) | ≥60-80 |
| Refractoriness Under Load (0.2MPa)(℃) | ≥1350-1460 |
| Thermal Shock Resistance (1100℃-water cooling)(times) | ≥15 |
Phosphate bonded high alumina bricks are preferred in many aluminum furnace linings because the phosphate causes the brick to be resistant to wetting and penetration by molten aluminum. They are also widely used in cement kilns, such as transition zone, sintering zone, cooling zone, cooling machine, working lining of cement shaft kiln, etc. Compared with ceramic bonded high-alumina bricks, phosphate bonded high alumina bricks have better spalling resistance, but refractoriness under load temperature and corrosion resistance of phosphate bonded high alumina bricks are both lower. So some fused corundum or mullite can be added into raw material to improve corrosion resistance and refractoriness under load temperature.