(19)

(11)

EP 0 988 256 A1

(12)

(43) Date of publication: 29.03.2000 Bulletin 2000/13 (21) Application number: 98923836.5 (22) Date of filing: 28.05.1998

(51) International Patent Classification (IPC)7: C03B 37/00, B22F 9/06, B01J 2/00, C04B 5/02 (86) International application number: PCT/US9810/882 (87) International publication number: WO 9854/103 (03.12.1998 Gazette 1998/48)

(84) Designated Contracting States: DE ES SE (30) Priority: 30.05.1997 US 866484 (71) Applicant: Kennecott Holdings Corporation Magna, UT 84044-6601 (US)	(72) Inventors: GEORGE, David, B. Salt Lake City, UT 84103 (US) SEPULVEDA, Jesus, A. Sandy, UT 84092 (US) WEDDICK, Anthony, J. Sandy, UT 84092 (US) STOREY, Anthony, G. Pueblo Nuevo, Ilo (PE) ARANA, David Tucson, AZ 85745 (US) (74) Representative: Kador & Partner  Corneliusstrasse 15 80469 München 80469 München (DE)