70% Alumina Fire Brick is a high-performance refractory material, composed of approximately 70% aluminum oxide (Al₂O₃). Manufactured from high-quality bauxite or synthetic raw materials, these bricks undergo high-pressure molding and high-temperature firing to achieve superior durability. With excellent resistance to high temperatures, thermal shock, and chemical corrosion, 70% Alumina Bricks outperform ordinary clay or lower-alumina bricks in strength, refractoriness, and erosion resistance. These characteristics make them an ideal choice for industrial furnaces, kilns, and other high-temperature equipment.
Compared to ordinary clay bricks or refractory bricks with 50%–60% aluminum content, 70% alumina bricks offer higher refractoriness, better compressive strength, and stronger erosion resistance. This makes them a mid-to-high-end refractory material with excellent cost-performance, suitable for industries that demand reliable, long-lasting, and heat-resistant linings. Highland Refractory provides high-quality 70% alumina bricks that meet international standards, ensuring stable performance for diverse industrial applications.
70% Alumina Fire Bricks are manufactured by combining high-alumina aggregates with binders and additives to form a dense, heat-resistant refractory product. The unique composition and manufacturing process ensure these bricks maintain structural stability under extreme thermal and mechanical stress.
They are designed to withstand direct flame, molten metal, slag, and high-temperature corrosive gases, making them indispensable in heavy industries such as steel, cement, petrochemicals, and glass production.
The bricks are typically used as linings for industrial furnaces, including heating furnaces, blast furnace walls, ladles, soaking furnaces, rotary kilns, ceramic kilns, and high-temperature burners. Large prefabricated blocks can also be produced for specific industrial designs, allowing for efficient installation and long service life.
70 Alumina Fire Brick
70% Alumina Fire Bricks are suitable for a wide range of high-temperature applications due to their exceptional thermal stability and chemical resistance. Typical applications include:
Steel Industry: Heating furnaces, soaking furnaces, arc furnace walls, ladles, and other molten metal handling equipment.
Non-Ferrous Metal Smelting: Copper and aluminum smelting furnaces, electrolytic cells, and high-temperature reaction vessels.
Cement Industry: Rotary kiln transition zones, firing zones, and clinker cooling sections.
Glass & Ceramics: Tunnel kilns, shuttle kilns, ceramic tunnel linings, and glass-melting furnace linings.
Petrochemical Industry: High-temperature cracking furnaces, incinerators, catalytic cracking reactors, and chemical processing vessels.
These bricks are ideal for applications that require high strength, chemical resistance, low thermal expansion, and excellent thermal shock performance. By using 70% alumina bricks, industries can significantly reduce furnace maintenance, extend equipment life, and improve operational efficiency.
| Property | Unit | Typical Value |
|---|---|---|
| Al₂O₃ Content | % | ≥70 |
| Refractoriness | ℃ | ≥1750 |
| Cold Crushing Strength (CCS) | MPa | ≥60 |
| Bulk Density | g/cm³ | 2.4 – 2.6 |
| Apparent Porosity | % | 18 – 22 |
| Linear Change (1500℃ × 2h) | % | ±0.2 – 0.4 |
| Thermal Shock Resistance (1100℃ Water Quenching) | Cycles | ≥15 |
These technical parameters ensure the brick maintains high strength, excellent wear resistance, and low deformation even in the most challenging industrial environments.
High Thermal Stability: 70% alumina bricks can withstand continuous operation at temperatures above 1500℃ without deformation or structural compromise.
Excellent Mechanical Properties: High compressive and bending strength make these bricks suitable for load-bearing sections in industrial furnaces.
Corrosion & Erosion Resistance: They resist slag attack, acidic gases, and alkaline dust, ensuring longer service life under harsh chemical conditions.
Volume Stability: Low thermal expansion reduces cracking and spalling, maintaining lining integrity over repeated thermal cycles.
Cost-Effective: Provides comparable performance to 80% or 90% alumina bricks at a lower price, offering high cost-performance ratio.
70 Alumina Fire Brick
The quality of 70% alumina fire bricks relies on scientific raw material selection, precision molding, and controlled high-temperature firing. Key steps include:
Raw Material Selection: High-purity bauxite is chosen with optimized particle gradation. Coarse particles (3–5mm) provide structural support, medium particles (0.5–3mm) fill gaps, and fine powder (<0.088mm) forms the bonding skeleton, ensuring minimal porosity and maximum strength.
Dry Pressing: High-tonnage presses (>1500 tons) compact the raw materials into dense bricks. Uniform pressing ensures dimensional accuracy (error <1mm) and consistent density.
High-Temperature Firing: Bricks are sintered at 1450–1550℃ to form mullite phase (3Al₂O₃·2SiO₂), enhancing refractoriness, thermal shock stability, and mechanical strength. Strict control of heating curves and insulation time ensures uniform sintering.
Quality Control: Every batch undergoes rigorous testing, including cold crushing strength, porosity, XRD crystal phase analysis, and microstructure inspection. This ensures each brick meets stringent industrial standards.
This combination of advanced materials, precise production, and thorough inspection ensures that Highland Refractory’s 70% alumina bricks deliver consistent, high-performance results for all industrial furnace applications.
Highland Refractory offers a full range of high-alumina bricks with consistent quality and reliable supply. Core advantages include:
Advanced Production Equipment: Multiple high-tonnage presses and tunnel kilns ensure even pressing and uniform firing. Annual output exceeds 30,000 tons of high-quality alumina bricks.
Technical Expertise: Experienced engineers with over 10 years in refractory design provide customized solutions for steel, cement, glass, petrochemical, and ceramic industries.
Strict Quality Assurance: Every step, from raw material entry to final packaging, is monitored. Testing includes CCS, porosity, microstructure, and XRD phase analysis.
Global Export Capability: Products are shipped to 40+ countries with export-compliant packaging, customs documentation support, OEM/ODM, and third-party inspections to reduce procurement risk.
Q1: How do 70% alumina bricks differ from standard high-alumina bricks?
A1: They have higher Al₂O₃ content, greater refractoriness, stronger mechanical strength, and superior chemical resistance, making them ideal for extreme conditions.
Q2: Can these bricks contact flames directly?
A2: Yes, they are suitable for direct flame exposure, molten metal, and slag contact in heating furnaces and rotary kilns.
Q3: Are custom shapes available?
A3: Yes, straight, wedge, curved, hanging bricks, and prefabricated parts are available to fit any furnace design.
Q4: How is packaging handled for safe transportation?
A4: Triple packaging includes wooden pallets, plastic sealing, and shockproof padding for long-distance export safety.
Q5: Which industries commonly use 70% alumina bricks?
A5: Steel, non-ferrous metals, cement, glass, ceramics, waste incineration, and petrochemical industries.
Highland Refractory delivers high-performance 70% alumina fire bricks that are thermally stable, erosion-resistant, and mechanically robust. With advanced production, strict quality control, and global logistics expertise, we provide reliable solutions to meet the demanding requirements of industrial furnace linings worldwide. Contact us today for quotations, custom orders, and technical guidance.
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