Alumina bubble firebrick is a type of insulating fire brick that adopts alumina powder and alumina hollow ball as the primary raw materials. These raw materials, combined with other binders, pass through high-temperature firing, which leads to the production of alumina bubble brick. Alumina bubble firebrick is manufactured using smelting blowing in an electric furnace.

Alumina bubble is a new thermal insulation material. It is made using commercial alumina, and its crystal form is a-Al2O3 mini crystal. Manufactures made into alumina bubble be able to withstand high temperatures, and the highest can reach 1800℃. Also, benefiting from their high-impact and light, the manufacturers are widely used in the petrochemical industry,

Alumina raw materials are melted in an electric arc furnace at 2200℃. When pouring the melt out, blow the melt with high-pressure air to make the melt dispersed into small droplets. During the cooling process, the droplets form alumina hollow balls due to surface tension effects. The hollow balls are screened to remove fine powder