(19)

(11)

EP 0 832 323 A1

(12)

(43) Date of publication: 01.04.1998 Bulletin 1998/14 (21) Application number: 96917277.0 (22) Date of filing: 13.06.1996

(51) International Patent Classification (IPC):  D21C 9/ 10( . ) D21C 9/ 16( . ) (86) International application number: PCT/AU1996/000354 (87) International publication number: WO 1996/041917 (27.12.1996 Gazette 1997/04)

(84) Designated Contracting States: AT DE FI SE (30) Priority: 13.06.1995 AU 1995PN03520 (71) Applicants: ICI AUSTRALIA OPERATIONS PROPRIETARY LIMITED Melbourne Victoria 3000 (AU) Queensland Metals Corporation Limited Toowong, QLD 4066 (AU)	(72) Inventors: VINCENT, Adam, Hayden Blackburn, VIC 3130 (AU) McLEAN, Ian, Alexander Riddells Creek, VIC 3431 (AU) (74) Representative: Evens, Paul Jonathan  Maguire Boss, 5 Crown Street St. Ives, Cambridge PE17 4EB St. Ives, Cambridge PE17 4EB (GB)