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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 Fundamentals of Forming Microbubbles in Liquid Metal Systems
Author(s) Roderick I.L. Guthrie, Mihaiela Isac
On-Site Speaker (Planned) Roderick I.L. Guthrie
Abstract Scope Gases are now widely used for stirring purposes in liquid metals, given the inventions of the porous plug, as well as other submerged gas injection methods, such as through nozzles, or tuyeres. Nonetheless, we know that any small bubbles forming at the exit pores of porous plugs, will normally rapidly coalesce into much larger bubbles. So, the question of how to form, and maintain, microbubbles in liquid metal systems still remains something of a question. It is nevertheless possible, but only under well-defined conditions. Given that such micro-bubbles can be very helpful in promoting mass transfer reactions (e.g. hydrogen degassing of liquid aluminum), and efficiently removing micro-inclusions (e.g. from liquid steel or aluminium), this is an important topic that needs to be properly addressed. We demonstrate the necessary conditions for the formation of microbubbles, and for their continued existence, by way of a typical ladle-tundish metallurgy example.
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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