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High alumina

High alumina

High alumina refers to materials with a high content of aluminum oxide (Al2O3), often used in ceramics, refractories, and cement for their excellent heat resistance, durability, and chemical resistance. Specifically, it’s used in applications like high-temperature linings in furnaces, kilns, and reactors, as well as in chemical-resistant concrete and rapid repair solutions.

Here's a more detailed look:

1. High Alumina Cement (HAC):

Composition

HAC is a type of cement containing a high percentage of alumina (40-80%). It’s produced by combining alumina (Al2O3) and limestone (CaCO3) and then firing the mixture at high temperatures. 

Properties:

  • High Heat Resistance: HAC can withstand extremely high temperatures (up to 1000°C) without losing strength. 
  • Rapid Hardening: HAC sets and hardens quickly, providing rapid strength development.
  • Chemical Resistance: It’s resistant to chemical attack, making it suitable for harsh environments.

 

Uses:

  • Refractory Applications: Linings for furnaces, boilers, kilns, and other high-temperature environments. 
  • Chemical-Resistant Concrete: Ideal for wastewater treatment plants, chemical plants, and marine structures
  • Rapid Repair Works: Quick setting and strength make it suitable for emergency repairs

2. High Alumina Bricks:

  • Composition: High alumina bricks are primarily made from alumina and other oxides.

Properties

  • High Heat Resistance: Can withstand very high temperatures (often above 1,600°C).
  • Durability: Resistant to thermal stress and chemical corrosion.
  • Low Porosity: Reduces moisture absorption, increasing lifespan.

Uses

  • Refractory Linings: Used in kilns, furnaces, and incinerators.     
  • Durability: Resistant to thermal stress and chemical corrosion.
  • Low Porosity: Reduces moisture absorption, increasing lifespan.

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