Process for removing hydrogen gas and non-metallic...

Details Process for removing hydrogen gas and non-metallic... Process for removing hydrogen gas and non-metallic...

C - Chemistry, Metallurgy

22

B

C22B 21/06 (2006.01)

Patent

CA 2087993

Abstract Molten unreinforced aluminum or aluminum matrix composites are treated to remove hydrogen gas and non-metallic inclusions. A melt is placed in a treatment vessel having a vaned rotary mixing impeller and a mixture of NH4Cl powder and inert gas is injected into the melt beneath the surface of the melt with mixing and is preferably followed by a period of inert gas injection. This results in the formation of fine bubbles which are well distributed throughout the melt, thereby causing the contained hydrogen gas and non-metallic inclusions and alkali/alkaline earth metal compounds to rise to the surface of the melt. Dross is regularly removed from the surface leaving a purified aluminum.

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