Alumina hollow ball bricks are made primarily from alumina hollow balls and alumina powder, combined with other binders, and fired at a high temperature of 1750° C. They can withstand temperatures up to 1800° C and possess high mechanical strength, making them a type of ultra-high temperature energy-saving insulation material. These products exhibit good thermal stability, low linear change rate upon reburning, strong insulation properties, low thermal conductivity, and long service life. They are widely used in high-temperature applications such as gasifiers in the petrochemical industry, reaction furnaces in the carbon black industry, and induction furnaces in the metallurgy industry, achieving highly satisfactory energ