Alumina hollow ball is a new type of high-temperature heat insulating material, which is smelted and blown with industrial alumina in an electric furnace, and its crystal form is a-Al2O3 microcrystal. With alumina hollow spheres as the main body, it can be made into products of various shapes. The maximum service temperature is 1800 ° C. 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 corundum products. There are two types of alumina hollow spheres: mixed grade balls and graded balls: the particle size of mixed grade balls is 0.2-5mm, and the particle sizes of graded balls are 0.2-1mm, 1-2mm, 2-3mm, 3-5mm. It has been widely used in high temperature and ultra-high temperature furnaces such as industrial gasifiers, carbon black industrial reaction furnaces, and metallurgical industry induction furnaces, and has achieved very satisfactory energy-saving effects.

Alumina hollow ball ---production process

The binders for alumina hollow ball refractory castables mainly include alumina cement, bonded clay, aluminum phosphate and aluminum sulfate, etc. The refractory powder is made of industrial alumina powder or corundum powder, and its fineness is less than 0.09mm The maximum particle size of the hollow sphere is 5mm, and the natural gradation or graded gradation is adopted. Additionally, admixtures or admixtures should be incorporated to enhance performance.

Alumina hollow ball castable --- Instructions for use

Alumina hollow sphere castable and its products are lightweight refractory materials with high temperature resistance and excellent energy saving, which are very stable in various atmospheres. Especially in the high temperature furnace of 1800 ℃. Hollow spheres can be used as high temperature and ultra-high temperature insulation fillers, high temperature refractory concrete lightweight aggregates, high temperature castables, etc. Hollow ball 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.