Process for decreasing the contaminant content of aluminium melts and aluminium alloy melts

摘要

In a process for decreasing the contaminant content of aluminium melts or of aluminium alloy melts principally their content of alkali metal, of hydrogen gas and of solid non-metallic contaminants, especially oxides, an inert gas, preferably nitrogen gas, containing a powder which develops chlorine gas, preferably hexachloroethane, is led into the aluminium melt or aluminium alloy melt isolated from the air at a temperature of 670-860 DEG C and at a pressure less than 2 atmospheres.