The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1996
Filed:
May. 03, 1995
Nancy J Ten Eyck, Texarkana, TX (US);
Michael C Lukens, Texarkana, TX (US);
Alumax Inc., Norcross, GA (US);
Abstract
There is disclosed an improved process for treating molten aluminum or aluminum alloys containing impurities, such as alkali metals, alkaline earth metals and hydrogen, to reduce the amount of impurities contained therein by in-line rotor degassing. The process comprising the sequential steps of: (a) contacting said molten aluminum or aluminum alloy with chlorine gas by rotor injection; and (b) contacting the molten aluminum or aluminum alloy with a mixture of chlorine gas and sulfur hexafluoride gas by rotor injection, wherein the chlorine gas flow rate in step (a) is between approximately 0.005 to 0.025 scfm and the gas flow rate in step (b) is a combination of a sulfur hexafluoride gas flow rate of between approximately 0.012 and 0.032 scfm and a chlorine gas flow rate of between approximately 0.005 to 0.025 scfm and wherein the ratio of sulfur hexafluoride flow to chlorine gas flow in step (b) is between approximately 1.25 and 2.5 by volume for a molten aluminum or aluminum alloy flow rate of between approximately 620 and 810 lbs/min.