Aluminum oxide hollow sphere light insulating brick and preparation method thereof

The invention relates to an aluminum oxide hollow sphere light insulating brick and a preparation method thereof. The technical scheme of the method comprises the steps of mixing 45-55wt% of aluminum oxide hollow sphere, 30-45wt% of Al2O3 micro powder, 6-13wt% of Rho-Al2O3 micro powder with 3-6wt% of silicon micro powder, additionally adding 5-15wt% of organic polymer fine powder and 20-30wt% of water according to the weight percentage of the mixture, evenly stirring, and molding in a pouring way, maintaining for 24-48h under the condition of room temperature, demolding, drying for 20-36h under the condition of the temperature being 100-120DEG C, and keeping the temperature under the condition of 1600-1700DEG C. The method is simple in technology and low in cost. The aluminum oxide hollowsphere light insulating brick prepared by the method is characterized by being low in volume density, low in heat conductivity, high in compression strength, high in use temperature, good in insulating effect, high in load softening temperature, and low in heavy firing line change rate.