Extra-grade high-alumina brick
High-Alumina Refractory Brick Product Types and Grading Standards Based on Al₂O₃ Content (GB/T 2988–2025) — Special‑Grade High‑Alumina Brick (LZ‑80): Al₂O₃ ≥ 80%, Apparent Porosity ≤ 18% — First‑Grade High‑Alumina Brick (LZ‑75): 75% ≤ Al₂O₃ < 80%, Softening Temperature under Load ≥ 1700℃ — Second‑Grade High‑Alumina Brick (LZ‑65): 65% ≤ Al₂O₃ < 75%, Compressive Strength ≥ 60 MPa — Third‑Grade High‑Alumina Brick (LZ‑55): 55% ≤ Al₂O₃ < 65%, Bulk Density 2.3–2.5 g/cm³ Functional Products: — Nano‑Modified High‑Alumina Bricks: Incorporating 5–8% nano‑Al₂O₃, enhancing thermal shock resistance by 50%. — Low‑Carbon High‑Alumina Bricks: Reducing firing temperatures to 1400℃, cutting CO₂ emissions by 12%. — Micro‑Expansion High‑Alumina Bricks: Exhibiting a high‑temperature linear expansion of +0.3%, effectively compensating for shrinkage. Modern Production Processes: — Intelligent Raw Material System: AI‑driven sorting of high‑alumina bauxite with Al₂O₃ content fluctuations kept within ±0.5%. — Composite Binders: A blend of silica fume and α‑Al₂O₃ nanopowder. — Digital Press Molding: Hydraulic press with pressures ranging from 160–200 MPa; in‑line 3D scanning for dimensional inspection, achieving an accuracy of ±0.3 mm. — Green Firing Technologies: Hydrogen‑powered tunnel kilns operating at temperatures between 1500–1600℃, coupled with waste heat recovery systems that reduce energy consumption by 25%. Applications & Application Areas: — Use Cases & Performance Benefits: — New Energy Lithium‑Ion Battery Sintering Kilns: Extending service life to 3 years. — Electronic Glass Borosilicate Melting Furnaces: Reducing energy consumption by 18%. — Hydrogen Energy Equipment Electrolyzer Insulation Layers: Cutting heat loss by 35%. — Environmental Hazardous Waste Incinerators: Improving corrosion resistance by 40%. Core Performance Advantages Compared to Traditional Materials: — Refractoriness: 1790℃ (compared to just 1650℃ for clay bricks). — Slag Resistance: Reducing SiO₂ erosion rates by 60%. — Thermal Conductivity: 1.8 W/(m·K) (superior to silicon bricks). Economic Analysis: — Initial Costs: 50–60% lower than zirconia‑corundum bricks. — Maintenance Frequency: 3‑year intervals without major overhauls (compared to the traditional 2‑year cycle). Fundamental Physical and Chemical Indicators: — Bulk Density: 2.5–3.2 g/cm³ (depending on grade). — Thermal Shock Stability: ≥ 15 cycles (water quench at 1100℃). — High‑Temperature Performance: — Softening Temperature under Load: 1420–1750℃. — Linear Change After Reheating: ≤ 0.5% (after 1600℃ for 3 hours). — Special Requirements: — Alkali Resistance: K₂O erosion ≤ 1.0 mm/100 h. — Thermal Shock Resistance: Nano‑type products achieve ≥ 30 cycles.
Category:
Description:
High-alumina refractory brick
Product Types and Grading Standards
- According to Al₂O₃ Content Grading (GB/T 2988-2025)
- Extra-grade high-alumina brick ( LZ-80): Al₂O₃ ≥ 80%, Apparent Porosity ≤ 18%
- First-grade high-alumina brick ( LZ-75): 75% ≤ Al₂O₃ < 80%, softening temperature ≥ 1700℃
- Second-grade high-alumina brick ( LZ-65): 65% ≤ Al₂O₃ < 75%; Compressive strength ≥ 60 MPa
- High-alumina brick, Grade 3 ( LZ-55): 55% ≤ Al₂O₃ < 65%, bulk density 2.3–2.5 g/cm³
- Functional Products
- Nano-modified high-alumina brick: added 5–8% nano-Al₂O₃ increases thermal shock resistance by 50%.
- Low-carbon, high-alumina bricks: Firing temperature reduced to… 12% reduction in CO₂ emissions at 1400℃
- Micro-expanding high-alumina bricks: High-temperature linear expansion +0.3% compensatory contraction
Modernized production processes
- Intelligent Raw Materials System
- High-alumina bauxite AI sorting (Al₂O₃ variation ≤ 0.5%)
- Composite Binder (Silica Fume) +α-Al₂O₃ nanopowder)
- Digital compression molding
- Hydraulic press pressure: 160-200MPa
- Online 3D Scan Dimensional Inspection (Accuracy: ±0.3 mm)
- Green Sintering Technology
- Hydrogen-fired tunnel kiln (temperature 1500–1600℃)
- Waste Heat Power Generation System (Energy Consumption Reduction) 25%)
Application
Application Fields
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Part used
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Performance Outcomes
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New Energy
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Lithium Battery Sintering Kiln
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Lifespan extended to 3 years
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Electronic glass
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High-borosilicate melting furnace
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Energy consumption reduced by 18%
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Hydrogen Energy Equipment
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Electrolyzer insulation layer
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Heat loss reduced by 35%
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Environmental protection
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Hazardous waste incinerator
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Corrosion resistance increased by 40%.
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Core Performance Advantages
- Compared with traditional materials
- Refractoriness: 1790℃ (only 1650℃ for clay bricks)
- Slag resistance: The SiO₂ erosion rate has decreased by 60%.
- Thermal conductivity: 1.8 W/(m·K) (superior to silica brick)
- Economic Analysis
- Initial cost: Lower than zirconia‑alumina bricks. 50–60%
- Maintenance frequency: 3-year warranty with no major repairs (vs. the traditional 2-year warranty)
Physicochemical Indicators
- Basic indicators: - Bulk density: 2.5–3.2 g/cm³ (By Level) - Thermal shock stability: ≥15 time(s) ( 1100℃ Water-cooled)
- High-Temperature Performance: - Start point of load softening: 1420-1750℃ - Change in the re-burning line: ≤0.5% ( 1600℃ × 3 h )
- Special Requirements: - Alkali resistance: Potassium oxide Erosion ≤1.0 mm/100 h - Thermal shock resistance: Nano-type ≥30 next time
Keywords:
Extra-grade high-alumina brick
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Email:zzjsrefractory@gmail.com
Address: Chengguan Industrial Zone, Xinmi City, Henan Province
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