This article combines 2026 industry standards and practical application experience to sort out the key points of the entire process of high alumina brick selection to help you accurately avoid pitfalls and choose the right product. Combined with the needs of different working conditions, accurate high alumina brick selection recommendations are given, taking into account performance and cost, and adapting to various industrial scenarios. 1. General scenarios for medium and low temperatures (≤1200°C, low erosion): Priority is given to three-level ordinary sintered high-alumina bricks, which have outstanding cost performance and are suitable for hot blast stoves, chimney linings, and low-temperature sections of kilns to reduce procurement costs. 2. Medium-temperature conventional scenarios (1200-1400°C, large temperature fluctuations): Second-level ordinary sintered high-alumina bricks are recommended, with balanced performance and good thermal shock resistance. They are suitable for conventional working conditions such as ceramic kilns, cement rotary kilns, preheating zones, and cooling zones. 3. Medium-high temperature and high erosion scenarios (1300-1500°C, slag/flue gas erosion): Use low-pore high-alumina bricks, which have strong corrosion resistance and erosion resistance. They are suitable for core parts such as glass melting furnaces and blast furnaces to reduce the frequency of replacement. 4. Medium-temperature and high-wear scenarios (≤1300°C, acidic environment): Use phosphoric acid-bonded high-aluminum bricks, which are resistant to peeling and wear. They are suitable for chemical reactors and electric furnace tops, taking into account both construction efficiency and use effects. 5. Key high-temperature scenarios (≥1400℃): Use first-grade sintered high-alumina bricks with Al₂O₃ content ≥75%, high temperature resistance and high strength, suitable for boiler main furnaces and steel smelting core linings.

As we all know, lightweight high-alumina bricks and heavy-weight high-alumina bricks are refractory materials widely used in the kiln industry. Lightweight high-alumina bricks are currently one of the ideal heat-insulating refractory materials. They have the characteristics of high compressive strength, low thermal conductivity, good insulation performance and low price. They are now widely used in porcelain monastic kilns and roller conveyors. Kiln, shuttle kiln, wall kiln are not used in various heating furnaces, coke ovens and other thermal equipment in the steel industry to heat treat materials and have broad market prospects.

Alkali return is actually a problem of hoarfrost on the surface of high-alumina refractory bricks. During the firing process, due to factors such as technology and raw materials, the brick body will produce certain pores, so there will be a certain water absorption rate. Soluble salts, along with moisture, transfer to the surface of the brick, forming what we call hoarfrost.