(19)

(11)

EP 0 797 631 A1

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(43) Date of publication: 01.10.1997 Bulletin 1997/40 (21) Application number: 95916502.0 (22) Date of filing: 21.04.1995

(51) International Patent Classification (IPC):  C04B 22/ 14( . ) C04B 28/ 26( . ) C09D 1/ 02( . ) C23C 8/ 40( . ) C23C 22/ 63( . ) C04B 28/ 00( . ) C09D 1/ 00( . ) C09D 7/ 12( . ) C23C 22/ 52( . ) (86) International application number: PCT/AU1995/000236 (87) International publication number: WO 1995/029207 (02.11.1995 Gazette 1995/47)

(84) Designated Contracting States: AT BE CH DE DK FR GB IE IT LI SE (30) Priority: 26.04.1994 AU 1949PM00529 (71) Applicants: COPPER REFINERIES PTY.LTD: Townsville, QLD 4810 (AU) UNIVERSITY OF QUEENSLAND St Lucia, Queensland 4067 (AU)	(72) Inventors: ATRENS, Andrej St. Lucia, QLD 4067 (AU) NAIRN, Jason Oxley, QLD 4075 (US) (74) Representative: Brewster, Andrea Ruth, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)