Alumina hollow balls and their products are lightweight refractory materials with high temperature resistance and excellent energy saving. They are very stable in various atmospheres, especially in high temperature kilns at 1800°C. Hollow balls can be used as high temperature and ultra-high temperature insulation fillers, high temperature refractory concrete lightweight aggregates, high temperature castables, etc. Hollow spherical bricks can be used for high temperature energy saving (>30%) down flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. For reducing the weight of the furnace body, transforming the structure, saving materials and saving energy, obvious effects will be achieved.
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Alumina hollow ball bricks are made of alumina hollow balls, corundum powder, calcined powder, etc. as raw materials, which are homogenized, shaped and sintered at high temperature.
The product has the characteristics of high temperature resistance, acid and alkali corrosion resistance, low thermal conductivity, good thermal insulation performance, low bulk density, etc. lining.
Alumina hollow ball is a new type of high-temperature thermal insulation material, which is smelted and blown with industrial alumina in an electric furnace, and its crystal form is α-Al2O3 microcrystal.
With alumina hollow balls as the main body, it can be made into products of various shapes. The maximum operating temperature is 1800℃. The mechanical strength of the products is high, which is several times that of ordinary lightweight products, and the bulk density is only one-half of the corundum products. It has been widely used in high temperature and ultra-high temperature furnaces such as petrochemical industrial gasifiers, carbon black industrial reaction furnaces, metallurgical industrial induction furnaces, etc., and has achieved very satisfactory energy-saving effects.
