Key Varieties of Special High-Alumina Bricks

 Special High-Alumina Bricks: The “Special Forces” with Unique Skills

In addition to the basic models, there is a category of “special high-alumina bricks” developed with exclusive capabilities for extreme environments:

1. Low-Creep High-Alumina Bricks: The “Stabilizing Pillar” at High Temperatures

• Black Technology: Nano-sized zirconia is added, like an “anti-wrinkle injection” for the brick body. Its deformation rate under high pressure at 1400℃ is halfe that of ordinary bricks.
• Application Fields: Molten salt tanks for solar thermal power generation (long-term immersion in molten salt at 565℃) and hydrogen energy steelmaking furnaces (resistant to hydrogen reduction corrosion). These scenarios require no deformation for a decade.

2. Corrosion-Resistant High-Alumina Bricks: The “Protection Expert” Against Acid and Alkali

There are two main types:

• Alkali-Resistant Type: Spinel is added to specifically resist potassium-sodium vapor in cement kilns. Its corrosion rate is 5 times slower than that of ordinary bricks.
• Acid-Resistant Type: Combined with silicon carbide, it forms a “protective film” on the surface in the atmosphere of hydrogen chloride and sulfur dioxide in waste incinerators.
• Typical Application Scenarios: Roasting furnaces for lithium battery raw materials (resistant to hydrogen fluoride corrosion) and coal chemical gasifiers (resistant to hydrogen sulfide corrosion).

3. High Thermal Conductivity High-Alumina Bricks: Refractory Bricks That “Conduct Heat”

• Special Structure: Copper fibers or graphite flakes are embedded, increasing the thermal conductivity of the refractory brick by 3 times, like installing “heat dissipation pipes” for the furnace.
• Uses: High-temperature energy storage equipment (rapid absorption and release of heat) and electron beam melting furnaces (reducing temperature differences on the furnace wall to prevent cracking), enabling more efficient heat energy utilization.