High-alumina brick

High-alumina bricks are manufactured primarily from high-quality sintered bauxite, formed under high pressure and sintered at high temperatures. Their Al₂O₃ content typically exceeds 48%. These products feature high refractoriness, excellent high-temperature strength, and good resistance to erosion, making them a common refractory material for the regenerative chambers, flue ducts, and insulation structures of glass melting furnaces.

Key Features:

High Refractoriness: With a high Al₂O₃ content, these bricks can operate at temperatures of 1450–1550°C, meeting the long-term service requirements for the upper layers of regenerators and high-temperature flue sections in glass melting furnaces.

High High-Temperature Strength: They maintain high mechanical strength at elevated temperatures, resisting deformation under pressure, making them suitable for applications such as the lower layers of regenerator grate structures and load-bearing walls.

Excellent Thermal Shock Resistance: Good thermal shock stability allows it to withstand the temperature fluctuations caused by periodic reversing in the regenerator, making it resistant to cracking and spalling.

High Chemical Stability: It exhibits good resistance to both acidic and alkaline furnace gases and dust, and is not easily eroded or pulverized within the regenerator.

Cost-Effective and Practical: Compared to electrically fused bricks, it offers lower costs and provides a high cost-performance ratio when used in medium-to-high-temperature zones that do not come into direct contact with molten glass.

Applications:

Glass melting furnace regenerator grids, regenerator walls, flue linings, chimneys, furnace bottom insulation layers, furnace door arches, and medium-to-high-temperature auxiliary areas not in direct contact with molten glass. Widely used in float glass, bottle and jar, tableware, and specialty glass melting furnaces.