Industrial alumina is the main raw material for making alumina balls, which are blown by electric fusion method using an electric arc furnace as the basic melting equipment and lined with graphite or other refractory materials. A sprue should be constructed at the edge of the furnace, and then a nozzle should be installed, which should be connected to the compressed air device.
We can tilt the furnace body and use graphite as the electrode.
We can add alumina powder to the melting pot and melt it by electricity. When the temperature exceeds 2200 degrees Celsius, rolling will occur. Under the condition of tilting the furnace body, a solution will flow out.
Compressed air will also blow the solution stream. If there is continuous spraying and condensation of the solution under different conditions of viscosity and surface tension, it may form air-encapsulated spheres. Only after collection and screening can they be stored according to different particle sizes for backup.
If the pressure of compressed air blowing is greater, the number of hollow alumina spheres will be greater.
The thickness of the alumina ball wall varies with different particle sizes. If the particle size range is between 0.5 mm and 5 mm, its thickness should be between 0.1 mm and 0.3 mm.
The natural bulk density of hollow spheres is inversely proportional to the particle size.