Porous Plug Technology for Degassing in Aluminum Foundry Ladles

摘要

The treatment of molten metals with purging gases is a well established practice in non-ferrous metallurgy. In the aluminum industry, inert or reaction gases are blown into the melt using porous plugs at multiple steps in the process, including in melting and holding furnaces, and more recently in ladles. To enable effective degassing in foundry ladles a complete package was developed that includes porous plugs, refractory expertise, gas supply technology and gas control equipment. This paper shows the technological and economical advantages of the system compared to standard impeller degassing systems. The benefits in degassing level, gas consumption, service live, maintenance and potential time savings are discussed.