Refractory high-alumina castable is a type of refractory material primarily composed of high-alumina bauxite, mixed with a certain proportion of clay, silicate cement, or other additives. After thorough mixing and uniform blending, it is prepared in a specific shape on-site or in a factory. It possesses high refractory performance, good erosion resistance, and thermal stability, and is widely used in various high-temperature industrial furnaces and thermal processing equipment.
II. What are the main uses of castable?
1. As the lining material for high-temperature industrial furnaces, such as steel-making furnaces, iron-making furnaces, and hot blast furnaces.
2. For filling the gaps between the furnace shell and the lining to maintain the overall stability of the lining.
3. As thermal insulation material for high-temperature thermal processing equipment, such as heating furnaces and heat treatment furnaces.
4. For repairing damaged parts of the lining extend the service life of the lining.
5. For the preparation of precast components, such as precast furnace linings and precast furnace bottoms.
III. Detailed physical and chemical indicators of high-alumina castable
1. Physical indicators:
(1) Bulk density: 2.0-2.6 g/cm³
(2) Compressive strength: ≥20 MPa
(3) Flexural strength: ≥10 MPa
(4) Coefficient of thermal expansion: 1.5-2.5×10^-6/℃
(5) Thermal conductivity: 1.5-3.0 W/(m·K)
2. Chemical indicators:
(1) Al2O3 content: ≥70%
(2) SiO2 content: ≤15%
(3) Fe2O3 content: ≤2%
(4) CaO content: ≤1%
IV. Precautions when using high-alumina castable
1. Before use, the castable should be stirred evenly to ensure there is no sedimentation or air bubbles.
2. During the construction process, the castable should be kept away from water, oil, dust, and other foreign substances to avoid affecting the quality of construction.
3. When constructing with castable, appropriate tools and methods should be used to ensure construction quality.
4. After the construction is completed, the castable should be properly cured to enhance its strength and heat resistance.
5. During use, regular inspections should be conducted to check the condition of the castable, and timely repairs or replacements should be made if damage or wear is found.
V. Storage of high-alumina castable
1. Storage environment: High-alumina castable should be stored in a dry, well-ventilated warehouse, away from humid, high-temperature, or direct sunlight conditions.
2. Storage containers: Clean plastic bags, woven bags, or other containers should be used for storage, avoiding mixing with foreign substances.
3. Storage period: The general storage period for high-alumina castable is 6 months. After the expiration date, quality inspections should be conducted, and only qualified material may be used.
4. Storage precautions: During storage, the bag opening should be kept closed to prevent moisture absorption and ensure product quality.
In summary, refractory high-alumina castable is a type of refractory material with excellent performance, widely used in high-temperature industrial fields. Understanding its characteristics, uses, physical and chemical indicators, as well as usage and storage methods, helps to better utilize its benefits and improve industrial production efficiency. We welcome you to contact us at any time.
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