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:
May. 26, 1987
Filed:
Mar. 17, 1986
Applicant:
Inventors:
Paul Desclaux, Jonquiere, CA;
Jean-Paul R Huni, Jonquiere, CA;
Assignee:
Alcan International Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25C / ; C25C / ;
U.S. Cl.
CPC ...
204 67 ;
Abstract
A method for controlling the rate of aluminum fluoride addition to a cryolite-based electrolyte of an aluminum electrolytic reduction cell makes use of the known ratio between cell temperature and bath (NaF:AlF.sub.3) ratio. A target temperature is established corresponding to a target bath ratio. The cell temperature is measured at intervals and the rate of AlF.sub.3 addition altered depending on whether the measured temperature is above or below the target temperature. The method is faster than traditional methods involving analysis of electrolyte samples, and is amendable to computer control.