Alumina hollow ball and its products are lightweight refractories with high temperature resistance and energy saving, which are very stable in various atmospheres. It is especially used in high temperature kiln at 1800 ℃. Hollow ball can be used as high temperature, ultra-high temperature insulation filler, high temperature refractory concrete lightweight aggregate, high temperature castable, etc. Hollow ball brick can be used in high temperature and energy saving (> 30%) down flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. It can reduce the weight of furnace body, improve structure, save material and save energy.
Haoyang alumina hollow ball brick [1] is made of alumina hollow ball, corundum powder, calcined powder and other raw materials by homogenization, molding and high temperature sintering.
The product has the characteristics of high temperature resistance, acid and alkali resistance, low thermal conductivity, good thermal insulation performance and small bulk density. It is mainly used for working lining and heat insulation lining of various industrial high-temperature kilns such as ceramics, electric ceramics, grinding wheels, refractories, etc.
Alumina hollow sphere alumina hollow sphere is a new type of high temperature heat insulation material. It is made by smelting and blowing industrial alumina in electric furnace, and its crystal form is a-Al2O3 micro crystal.
With alumina hollow ball as the main body, various shapes of products can be made. The highest service temperature is 1800 ℃. The mechanical strength of the products is high, which is several times of that of ordinary light products, while the bulk density is only half of that of corundum products.
It has been widely used in high-temperature and ultra-high-temperature kilns, such as gasifier in petrochemical industry, carbon black industrial reaction furnace, induction furnace in metallurgical industry, and achieved satisfactory energy-saving effect.
