LZ-65 High alumina brick

Product Overview

Our LZ-65 High Alumina Bricks are premium-quality, shaped refractory products specifically engineered for demanding glass furnace applications. The “LZ-65” designation follows the Chinese National Standard classification, where “LZ” stands for “high alumina brick” , and “65” indicates a nominal alumina (Al₂O₃) content of ≥65% .

Manufactured from selected high-quality bauxite as the primary raw material, LZ-65 bricks undergo a rigorous production process including batching, mixing, high-pressure forming, and sintering at controlled temperatures of 1360-1480°C in tunnel kilns . This process results in products with accurate dimensions, consistent quality, and optimized microstructure featuring corundum and mullite as the main mineral phases.

With 65% Al₂O₃ content, LZ-65 bricks represent a high-performance grade in the standard high alumina brick family, offering enhanced refractory properties compared to LZ-55 while maintaining excellent cost-effectiveness for critical glass furnace zones requiring superior heat resistance and mechanical strength .

Key Features & Benefits for Glass Industry

• Superior Refractoriness for High-Temperature Glass Furnace Zones: LZ-65 bricks offer exceptional heat resistance with a refractoriness of ≥1790°C, making them ideal for the most demanding high-temperature environments of glass melting furnaces .

• Enhanced Load-Bearing Capacity at Operating Temperatures: With a refractoriness under load (0.2MPa) of ≥1500°C, these bricks maintain excellent structural integrity under both thermal and mechanical stress in glass furnace superstructures and regenerators .

• Excellent Resistance to Glass Batch Attack: As a chemically neutral refractory with higher alumina content, LZ-65 provides superior resistance to corrosion by both acidic and alkaline components present in glass batch materials and furnace atmospheres .

• Improved Thermal Shock Resistance: LZ-65 bricks offer thermal shock resistance between that of clay bricks and silica products, with enhanced stability under fluctuating temperatures in glass furnace cycling conditions .

• Excellent Volume Stability at High Temperatures: Controlled permanent linear change (+0.1 to -0.4% at 1500°C×2h) ensures exceptional dimensional stability during the furnace campaign, maintaining tight joints and structural integrity throughout the service life .

• High Mechanical Strength for Extended Durability: Cold crushing strength of ≥45-60 MPa ensures superior durability during transport, installation, and throughout the demanding service life in glass furnace applications .

Applications in Glass Industry

LZ-65 high alumina bricks are specifically engineered for various critical zones of glass melting furnaces where enhanced performance is required:

Primary Glass Furnace Applications:

• Glass Furnace Superstructures: Upper walls, breast walls, and regenerator crowns where temperatures exceed 1500°C and alkaline vapor exposure is severe .

• Regenerator Chambers: Checker bricks and chamber linings for heat recovery systems, where thermal cycling and chemical attack require materials with superior durability .

• Port Arches and Port Necks: Flame port structures directing combustion gases into the melting chamber, requiring excellent thermal shock resistance .

• Burner Blocks: Areas subject to direct flame impingement and high thermal stress .

• Glass Furnace Bottoms: Working lining and permanent layer applications in high-wear zones.

Secondary Glass Industry Applications:

• Glass Tank Forehearths: Channels and distributor blocks for molten glass distribution .

• Specialty Glass Furnaces: For borosilicate, aluminosilicate, and other specialty glass compositions where enhanced refractory properties are essential.

• Glass Annealing Lehrs: Structural components where thermal stability at elevated temperatures is required.

Other Industrial Applications (Reference):

LZ-65 high alumina bricks are also widely used in:

• Steel Industry: Electric arc furnace roofs, ladle linings, blast furnaces, hot blast stoves, and reheating furnaces

• Cement Industry: Rotary kiln transition zones and cooler linings

• Ceramic Industry: Tunnel kiln linings and kiln furniture

• Non-Ferrous Metals: Smelting and refining furnaces for copper, aluminum, and other metals

• Petrochemical Industry: Process heaters, reformers, and cracking furnaces

Why Choose Our LZ-65 High Alumina Bricks for Glass Furnaces?

Our LZ-65 high alumina bricks are manufactured specifically with glass industry requirements in mind:

Manufacturing Excellence:

• Raw materials undergo grading, sorting, and magnetic separation to remove impurities that could affect glass quality .

• High-pressure forming ensures uniform density and accurate dimensions for tight joint construction .

• Controlled firing in tunnel kilns at 1360-1480°C ensures complete phase transformation and consistent quality .

• 100% dimensional inspection before packaging ensures proper fit during installation .

Glass Industry Quality Assurance:

• Chemical composition verified by XRF analysis to ensure Al₂O₃ ≥65% and Fe₂O₃ within specification .

• Physical properties tested per ASTM/GB standards to ensure reliable performance .

• Low iron content minimizes risk of glass defects from refractory contamination .

• Thermal shock resistance testing available upon request for specific glass furnace applications.

Technical Support:

• Thermal calculation and material selection support based on furnace operating conditions .

• Professional lining design team for customized solutions .

• On-site installation guidance and supervision available .

• Special application consultation for thermal insulation materials .

With extensive experience in refractory manufacturing for the glass industry and ISO 9001 certification, our technical team provides comprehensive support, from material selection and furnace design consultation to installation guidance .

For Inquiries:

Contact our glass industry specialists for application engineering support, custom sizing, or to discuss which high alumina brick grade is optimal for your specific glass furnace design and operating conditions. We provide detailed technical data sheets, shop drawings, and certification documents with every order.