Alkali-resistant bricks for cement kilns refer to clay refractory bricks that are primarily made from low-alumina refractory clay and possess alkali erosion resistance in cement kiln systems. The main raw materials for alkali-resistant bricks include mullite, pyrophyllite, and silica. The alkali resistance mechanism of these bricks involves reacting with alkali metal oxides at high temperatures to generate a high-viscosity liquid phase, which forms a glaze protective layer. This layer covers the brick surface and blocks surface pores, preventing the penetration and erosion of alkali metal melts, thus achieving the purpose of alkali resistance.
Alkali-resistant bricks can be classified into four types: ordinary, high-strength, arch, and insulating.
Applications of alkali-resistant bricks in cement kilns:
Ordinary alkali-resistant bricks are mainly used in the preheater, tertiary air ducts, and other areas of the cement kiln.
High-strength alkali-resistant bricks are primarily used in the preheater, decomposition furnace, tertiary air ducts, vertical rising flue, cyclone tube, and cone.
Arch alkali-resistant bricks are mainly used in the preheater, tertiary air ducts, and other areas of the cement kiln.
Insulating alkali-resistant bricks are mainly used in the rear kiln mouth, kiln door cover, and cooler of the cement kiln.