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:
Mar. 08, 1988
Filed:
Dec. 16, 1986
William C Copenhafer, Yardley, PA (US);
FMC Corporation, Philadelphia, PA (US);
Abstract
Beryllium is efficiently recovered from silicate ores in a hydrometallurgical, single solvent, process which avoids the complexities, high costs and hazards ofpyrolytic, fluorination and acid leach methods, by contacting the ore in a closed reactor at elevated temperature and autogenous pressure with a concentrated caustic solution and lime or lime hydrate to form a slurry containing dissolved beryllium, reducing the pressure to about one atmosphere and the temperature to below the boiling point of the caustic solution, separating by-product solids to leave a pregnant leach liquor, diluting and digesting the leach liquor to precipitate the beryllium and to leave a caustic mother liquor, and separating the beryllium. The caustic mother liquor can be recycled to the ore contacting step in a closed loop version of the process.