Spray Degassing as a Method for Hydrogen Removal in Aluminum Melts

Abstract

A continuous hydrogen-removal method from aluminum melt, spray degassing, is presented. The equilibrium equation of this method is discussed theoretically. Theoretical equilibrium analysis shows that the final hydrogen content of the melt is only affected by the purging gas flow rate and the melt mass flow rate. The hydrogen content of the outlet melt always contains a constant during the whole degassing time. The final hydrogen content of the melt decreases with increasing purging gas flow rate and increases with increasing melt mass flow rate. Compared with the rotary impeller degassing method, spray degassing consumes less treatment time and purging gas volume. Experiments were conducted using the method to remove the hydrogen in aluminum melt. The experimental results show that, the spray degassing is a good hydrogen-removal method.