PRODUCT DESCRIPTION

Magnesia Alumina Spinel Brick

Introduction

Magnesia alumina spinel bricks are premium-grade refractory alkaline materials engineered for modern high-temperature industrial furnaces. Manufactured using high-purity fused or sintered magnesia and synthetic magnesia-alumina spinel grains, these bricks are formed under ultra-high pressure and fired at precise high temperatures.

During the sintering process, a specialized network of periclase-spinel direct bonding forms within the matrix. This unique microstructure effectively eliminates the structural weaknesses of traditional basic refractories, offering a perfect balance of thermal stability, mechanical strength, and chemical inertness. It stands as the premier eco-friendly alternative to traditional magnesia-chrome linings.

Advantages

• Exceptional Thermal Shock Resistance: The distinct difference in thermal expansion coefficients between periclase and spinel creates a highly engineered network of micro-cracks during firing. These micro-cracks absorb sudden thermal stresses, allowing the bricks to withstand severe temperature fluctuations without cracking, spalling, or peeling.

• 100% Chromium-Free & Eco-Friendly: Containing zero chromium, these bricks eliminate the risk of forming toxic hexavalent chromium (Cr⁶⁺) under alkaline, high-temperature operations. They are fully compliant with the stringent environmental and green production regulations enforced worldwide.

• Superior Corrosion and Clinker Resistance: The chemically stable spinel phase forms an inert barrier that strongly resists the penetration and chemical erosion of volatile alkalis, sulfates, cement clinkers, and basic slags.

• Excellent High-Temperature Volume Stability: Exhibiting a low thermal expansion coefficient and high refractoriness under load over 1700°C, the bricks guarantee zero residual shrinkage or deformation during extended campaigns, securing the structural integrity of the furnace lining.

• Superb Resistance to Structural Spalling: Because aggressive molten slags and industrial vapors cannot deeply infiltrate the dense micro-porous matrix, the brick prevents the formation of a brittle altered layer, stopping thick structural chunks from falling off.

Applications

1. Cement & Lime Industry

· Rotary Kiln Burning Zones: The industry standard lining for the burning, transition, and safety zones of modern large-scale cement rotary kilns and lime kilns, offering exceptional coating-holding capabilities and extended campaign lives.

2. Glass Industry

· Regenerator Checker-Work: Widely installed in the top and middle layers of glass furnace regenerator checkers. They handle intense thermal cycling and aggressively resist volatile sodium sulfate (Na₂SO₄) attacks and vapor condensation.

3. Iron & Steel Industry

· Steel Refining Ladles (LF / VOD): Applied as an excellent chromium-free lining alternative for the walls and bottoms of high-purity steel refining ladles, enduring severe mechanical washing and alkaline refining slags.

4. Non-Ferrous Metallurgy

· Smelting Furnaces & Converters: Used in the linings of copper, nickel, and lead smelting equipment to withstand the chemical attacks of multi-component metallurgical slags.

Detailed Storage Guidelines

1. Storage Location

· Dry & Ventilated Indoor Storage: The bricks must be stored in a dry, well-ventilated warehouse.

· Climate Control: Maintain a stable temperature and low humidity in the warehouse to prevent condensation caused by temperature drops.

2. Moisture Protection

· Elevated Storage: Keep the brick pallets on racks or raised platforms. Ensure they are at least 15-20 cm off the ground and 50cm off the wall to avoid rising dampness or flooring moisture.

· Ventilation and Moisture Dissipation: After removing the magnesia bricks from the container, place them in a well-ventilated area for a few days to dissipate any residual moisture absorbed during maritime transit

· Original Packaging Sealed: Keep the original seaworthy packaging (plastic shrink wrap and strapping) intact until the moment of installation. Do not open the wrap early.

3. Handling & Stacking

· First-In, First-Out (FIFO): Implement a FIFO inventory system to minimize the total storage time of the bricks.

   TECHNIQUE DATA