Research on water simulation experiment of the rotating impeller degassing process

The purification technology by rotating impeller degassing (RID) is becoming one of the important methods to purify molten Al alloys. The degassing efficiency of the RID process is determined by the interaction of many factors. The relationship between technological parameters and degassing efficiency can be defined by building the proper mathematical model which can be used for guidance in practical production. In this work, a quadratic polynomial model of degassing efficiency was built by using the orthogonal regression method. The response equation of degassing rate to the gas flow rate, rotational speed and blowing time was fitted by using multiple-regression estimation methods. Furthermore, the optimal processing parameters of the RID process were defined, namely rotational speed v = 374   rpm / min and gas flow rate q = 1.8 dm3/min and the optimized parameters were confirmed by smelting trial.