Description
Refractory bubble alumina balls (also called refractory hollow alumina balls, or sphere alumina refractory), bubble alumina balls, and viable products are light refractories with high-temperature resistance and excellent energy saving, which are very stable in various atmospheres. Especially in the high-temperature kiln at 1800 centigrade, which is a high-purity, extra high-alumina refractory ball, the crystal form is a-Al2O3 microcrystal, which is an electric arc furnace product made from high-purity alumina. The product chemistry is similar to that of white aluminum oxide. Alumina bubble balls are formed from molten alumina, resulting in hollow spheres of low bulk density, and high insulating properties. It has a composition of 95.6% Al2O3, 3.8% CaO, and 0.6% other oxides. It is a blend of Al2O3 bubbles and refractory cement with a uniform particle size of less than 4 mesh (5 mm). After an initial set time of 1 to 4 hours and a final set time of 7 to 10 hours, the bubble alumina balls can reach a bulk density of 1500 kg/m3 (93.6 pcf).
Bubble alumina is used in the production of lightweight insulating refractories where low thermal conductivity and high-temperature properties are the prime requirements. Alumina Bubble is also used effectively for loose-fill refractories, i.e. low density, high insulation refractory castable, concrete, or ceramic bodies useful in a range of applications with temperatures up to 1825°C (3317°F).
The bubble alumina balls have high mechanical high strength, which is several times higher than general light products, while their bulk density is only half of the same as corundum products. The alumina bubble is mainly used in high-temperature furnace / industrial furnace insulation, such as petrochemical industrial gasifiers, carbon black industrial reactors, metallurgical industrial induction furnaces, and other high-temperature, ultra-high temperature furnaces or kilns. The energy-saving effect is very good.
Application of Refractory Bubble Alumina Balls :
Alumina hollow balls can be used for high-temperature, ultra-high-temperature insulation filler, it can be re-processed as bubble alumina castables and alumina sphere bricks, the energy can save (> 30%) inverted flame kiln, shuttle kiln, and molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. By reducing the weight of the furnace body, reforming the structure, saving materials, and saving energy, the energy saving could reach 40%, all of which have achieved apparent effects.
Alumina hollow balls have been widely applied in petrochemical industry gasifiers, carbon black industrial reaction furnaces, metallurgical industry induction furnaces, also other high-temperature and ultrahigh-temperature kilns, and achieved satisfactory results in energy saving.
