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. 09, 1991
Filed:
Dec. 01, 1989
Ari Bar-on, Shaker Heights, OH (US);
Kenneth L Gallaher, Shaker Heights, OH (US);
Jonathan S Greenberg, Shaker Heights, OH (US);
David V Neff, Euclid, OH (US);
Douglas H Rothenberg, Shaker Heights, OH (US);
The Carborundum Company, Niagara Falls, NY (US);
Abstract
A method for controlling the magnesium content of molten aluminum includes the steps of injecting a halogen gas into the molten aluminum, sampling a portion of the resulting gases evolved from the molten aluminum, detecting the presence of constituents in the sampled gases and/or characteristics of the sampled gases indicative of the imminent evolution of unreacted halogen gas, and adjusting the rate of halogen gas injection to approach the point where unreacted halogen gas is about to be evolved. In the preferred embodiment, the halogen gas is chlorine; the detected constituents are gaseous hydrogen chloride (CHl) and aluminum chlorhydrate compounds (Al.sub.2 Cl.sub.x .multidot.(OH).sub.6-x); and the detected characteristic is the opacity of the sampled gases. The invention includes a technique for adjusting the rate of halogen gas injection so as to approach the optimal rate. The invention also includes (1) a sensor for detecting the content of HCl and Al.sub.2 Cl.sub.x .multidot.(OH).sub.6-x and the opacity of the withdrawn gases, (2) apparatus for controlling the injection of halogen gas in response to detected conditions, and (3) molten aluminum having a desired content of magnesium produced by the method according to the invention.