Overview
High-temperature refractory aggregates are granular materials designed to withstand extreme thermal and mechanical stress in industrial applications. Composed of minerals like alumina, silica, magnesia, or zirconia, they serve as the structural backbone in refractory castables and monolithic linings. These aggregates are classified by material composition (e.g., bauxite, corundum, chamotte) and particle size distribution (typically 0-10mm). Their performance directly impacts the service life of high-temperature equipment, making quality control critical during production.
Physical and Chemical Properties
Refractory aggregates exhibit exceptional thermal stability, with pyrometric cone equivalent (PCE) values typically ranging from Cone 26 to Cone 42 (1580-2000°C). Their low thermal conductivity (0.5-3.0 W/m·K) ensures effective heat insulation. Chemical resistance varies by composition: alumina-rich aggregates resist basic slags, while silica-based types handle acidic conditions better. The bulk density (1.8-3.2 g/cm³) and porosity (5-30%) significantly influence thermal shock resistance and mechanical strength.
Main Applications
In steelmaking, these aggregates form ladle linings and tundish working layers. Cement plants use them in rotary kiln transition zones, while glass manufacturers employ them in furnace regenerators. Specialized applications include foundry coatings (zircon aggregates) and aerospace components (high-purity alumina). The petrochemical industry utilizes them in catalytic cracker units where temperatures exceed 1000°C with corrosive atmospheres.
Safety and Storage
Though non-toxic, airborne dust from handling can cause respiratory irritation. OSHA recommends P2 filtration masks during bulk transfer operations. Store aggregates in weatherproof silos or palletized bags with moisture barriers. Material compatibility is crucial - magnesia aggregates must be isolated from humid environments to prevent hydration. Always verify MSDS for specific material safety data before large-scale handling.
B2B Procurement Guide
Industrial buyers should specify: 1) Particle size distribution (standard or customized gradation), 2) Chemical composition (minimum Al₂O₃ content for alumina aggregates), 3) Thermal expansion coefficient matching the application. For large projects, request factory audits to verify production QC processes. Consider freight costs - some aggregates like mullite have better bulk density for transportation. Sample testing under simulated service conditions is recommended before full procurement.
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