Edwin J Bielecki

US Patent:

46631305, May 5, 1987

Filed:

Nov 14, 1983

Appl. No.:

6/551116

Inventors:

Roger M. Bergman - Sanatoga PA
Edwin J. Bielecki - Boyertown PA
Brian J. Higgins - Reading PA
Karl A. Romberger - Gilbertsville PA

Assignee:

Cabot Corporation - Waltham MA

International Classification:

C01G 3100

US Classification:

423 68

Abstract:

Disclosed is a process for dissolving tantalum and/or columbium-containing materials contaminated with alkali metal impurities. The tantalum and columbium materials are digested in a solution comprising hydrofluoric acid and a fluosilicate-containing compound. The alkali metals are reacted to form precipitated fluosilicates, which then can readily be separated.

US Patent:

45929041, Jun 3, 1986

Filed:

Feb 22, 1982

Appl. No.:

6/351348

Inventors:

Edwin J. Bielecki - Boyertown PA
C. Edward Mosheim - Hereford Township, Berks County PA

Assignee:

Cabot Corporation - Boston MA

International Classification:

C01G 3300

US Classification:

423472

Abstract:

A process for the recovery of columbium values from a columbium-containing aqueous hydrofluoric acid solution. The columbium-containing solution is heated, with agitation, to cause evaporation and hydrolysis, resulting in the formation of a slurry from which columbium oxyfluoride can be separated and recovered.

US Patent:

50230590, Jun 11, 1991

Filed:

Nov 2, 1988

Appl. No.:

7/266394

Inventors:

Edwin J. Bielecki - Boyertown PA
Karl A. Romberger - Gilbertsville PA
Bart F. Bakke - Douglassville PA
Martin A. Hobin - Allentown PA
Charles R. Clark - Pottstown PA

International Classification:

B01D 1100

US Classification:

423 9

Abstract:

A metallurgical processing system for economically recovering metal values, such as columbium, tantalum, thorium, and uranium from dilute source solids, such as digestion sludges, by a series of steps including: 1) slurrying the source solids with dilute hydrofluoric acid to produce a solid phase and a liquid phase containing dissolved tantalum and columbium, then extracting tantalum and/or columbium from the liquid phase by means of a liquid ion-exchange process and then, additionally; 2) roasting the solid phase with sulfuric acid to recover and recycle hydrofluoric acid, leaching the roasted solids with dilute sulfuric acid to produce a disposable solid phase and a liquid phase containing thorium and uranium, and extracting thorium and uranium from the liquid phase by means of a liquid-liquid amine extraction process.

US Patent:

44204698, Dec 13, 1983

Filed:

Jun 1, 1982

Appl. No.:

6/384077

Inventors:

Roger M. Bergman - Sanatoga PA
Edwin J. Bielecki - Boyertown PA
Charles R. Nippert - Pottstown PA

Assignee:

Cabot Corporation - Boston MA

International Classification:

C01G 3300

US Classification:

423592

Abstract:

A process for converting columbium oxyfluoride (CbO. sub. 2 F) to columbium oxide (Cb. sub. 2 O. sub. 5) comprising heating CbO. sub. 2 F under select pyrohydrolysis conditions.