Overview
Waste fused zirconia corundum bricks (commonly called AZS refractories in industry) are recycled materials from glass furnace linings, metallurgical furnaces, and other high-temperature applications. These bricks originally consist of zirconia (ZrO₂), alumina (Al₂O₃), and silica (SiO₂) in a fused matrix, offering exceptional resistance to thermal shock and chemical corrosion. After primary service life (typically 3-8 years), these bricks retain significant refractory properties, making them valuable for secondary applications. The recycling process involves sorting, crushing, and sometimes chemical treatment to remove adhered contaminants like glass or metal residues.
Physical and Chemical Properties
The physical properties vary based on original brick grade and usage history. Typical bulk density ranges 3.6-4.0 g/cm³, with porosity increasing after thermal cycling. The ZrO₂ content (usually 20-40%) directly correlates with corrosion resistance – higher zirconia grades command better recyclability. Chemically, the material exhibits remarkable stability up to 1,750°C, with low thermal expansion (≈7×10⁻⁶/°C) due to zirconia's phase stabilization. The glassy phase (10-20% in original bricks) may recrystallize during use, affecting recyclate performance. Unlike virgin AZS, waste bricks often contain microcracks and compositional gradients from thermal stress.
Main Applications
The primary reuse is as aggregates in monolithic refractories – crushed waste bricks (3-10mm particles) are blended into castables for ladle linings or backup layers. Finely ground material (≤1mm) serves as raw material for new AZS products, reducing production costs by 15-30% compared to virgin materials. In lower-grade applications, whole bricks may reline non-critical furnace zones. Some processors extract zirconia via hydrometallurgical methods for high-purity applications. Emerging uses include radiation shielding materials and abrasive media, leveraging zirconia's density and hardness.
Safety and Storage
While non-hazardous under most regulations, workplace precautions are essential. Dust generated during crushing may contain crystalline silica – use NIOSH-approved respirators and wet processing where possible. Sharp edges require cut-resistant gloves during handling. Storage should prevent moisture absorption (which degrades crushability) and contamination from organics/ferrous materials. Outdoor storage is acceptable if covered; stack height should not exceed 2 meters to prevent crushing-related particle size changes. Fire risk is minimal due to non-combustible nature.
B2B Procurement Guide
Key specifications when purchasing include: ZrO₂ content (verify via XRF analysis), contamination levels (magnetic separation tests for steel), and particle size distribution (for aggregate applications). Suppliers should provide historical service data (e.g., original furnace type, service temperature). Logistics considerations: Bulk shipments (≥20 tons) typically offer best economics. For international trade, confirm whether materials qualify as 'waste' or 'recyclable goods' under destination regulations. Quality certifications like ISO 14001 indicate responsible recycling practices. Sample testing is strongly recommended before large orders.
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