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Novel Degasification Design for Aluminum Using an Impeller Degasification Water Physical Model

A full scale water physical model of an aluminum degassing crucible was built to analyze the effect of changing the point of gas injection, from the conventional location, through the shaft, to an injection underneath impeller, on the performance of three rotor designs, based on the oxygen kinetic elimination from water by N2 injection, similar to hydrogen removal from liquid aluminum, under different degassing conditions. Results show that the point of gas injection plays an important role in the kinetics and efficiency of the degassing operation. The use of gas injection underneath the impeller increases notoriously the efficiency of the degassing processes.