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:
Jun. 20, 1989
Filed:
Oct. 13, 1987
Eric F Husted, Ulster, PA (US);
GTE Products Corporation, Stamford, CT (US);
Abstract
A method is disclosed for purifying cobalt of sodium and ammonia which involves heating a solution of hexammine cobalt (III) chloride at a temperature of at least about 80.degree. C., adding sodium hydroxide to the solution at a rate of addition not exceeding about 0.22 moles of sodium hydroxide per mole of cobalt per minute with the total amount of sodium hydroxide not exceeding about 1.4 times the stoichiometric amount required to form cobaltic hydroxide, separating the resulting cobaltic hydroxide precipitate from the resulting liquor, washing the precipitate with hot deionized water to remove sodium so that the level of sodium in the cobaltic hydroxide is equal to or less than about 60 weight parts per million on a cobalt basis, and firing the resulting washed precipitate at a temperature of from about 180.degree. C. to about 850.degree. C. to remove essentially all of the water and ammonia therefrom.