Introduction to Graphite Degassing Rotors and Shafts
During aluminum and aluminum alloys smelting, hydrogen is produced by chemical action with steam and diffuses in molten aluminum, which will cause inner structural defect in aluminum products. In order to avoid such defect, most aluminum factories apply dissolved gas floating method to purify molten aluminum. i.e. inert gases such as nitrogen, argon is injected into molten aluminum, and hydrogen will be brought to molten aluminum surface with spread and rise of inert gas.
Graphite rotor and shaft set is necessary to inject inert gas and stir for degassing regarding both intermittent and continuous online degassing methods. Thanks to properties of heat-resistance, anti-oxidation, high strength and non-infiltration to aluminum, graphite becomes the optimal choice for material of rotor and shaft, which is also named as graphite degassing rotor/impeller and shaft.