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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium The Science of Melt Refining: An LMD Symposium in Honor of Christian Simensen and Thorvald Abel Engh
Presentation Title The Use of Nitrogen to Degas Molten Aluminium - Comparison of Metallurgical Results with Argon and Nitrogen Used in an ACD™
Author(s) Florent Gougerot, Bruno Maltais, Etienne Tremblay
On-Site Speaker (Planned) Florent Gougerot
Abstract Scope The use of argon to degas liquid aluminium is a widespread practice in aluminium casthouses, and the removal of the hydrogen contained in the metal by using this noble gas is a proven method with no downside effect on the metallurgical quality of the resulting metal. However, because of the sometimes high cost of argon, some producers are looking for a cheaper gas. Nitrogen often comes as an alternative, but there are many who are questioning the degassing efficiency of this gas or the risk of metal contamination by nitrides. STAS Inc. has carried out a series of comparative tests, successively using argon and nitrogen in an ACD for degassing liquid aluminium. This paper presents the results obtained during this test campaign carried out in an industrial environment.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Holistic Approach to Molten Metal Cleanliness
Developments in Inclusion Removal Technology
Effects of 2 ppm Beryllium on the Oxidation of a 5XXX Aluminum Alloy at Temperatures between 500 C and 750 C
Modelling of Hydrogen Removal in Gas Fluxing of Molten Aluminium
Overview of Ultrasonic Degassing Development
Oxide Skin Strength on Molten AA5XXX Aluminum Alloy – Effect of Beryllium and Alternatives
Results of Trials with a Multi Stage Filtration System Employing a Cyclone
The Contributions of Thorvald Engh and Christian Simensen to the Science of Melt Refining
The Fundamentals of Forming Microbubbles in Liquid Metal Systems
The Use of Nitrogen to Degas Molten Aluminium - Comparison of Metallurgical Results with Argon and Nitrogen Used in an ACD™
Understanding of Interactions between Pyrolysis Gases and Liquid Aluminum and Their Impact on Dross Formation

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