(19)

(11)

EP 0 165 945 A1

(12)

(43) Date of publication: 02.01.1986 Bulletin 1986/01 (21) Application number: 85900029.0 (22) Date of filing: 24.12.1984

(51) International Patent Classification (IPC):  C01G 49/ 00( . ) C01D 1/ 22( . ) C01D 1/ 32( . ) D21C 11/ 04( . ) C01D 1/ 04( . ) C01D 1/ 28( . ) D21C 11/ 00( . ) D21C 11/ 12( . ) (86) International application number: PCT/AU1984/000270 (87) International publication number: WO 1985/002834 (04.07.1985 Gazette 1985/15)

(84) Designated Contracting States: DE FR SE (30) Priority: 23.12.1983 AU 19830003009 (71) Applicant: NORTH BROKEN HILL LIMITED Burnie, TAS (AU)	(72) Inventors: WUNDER, Heiko Penguin, TAS 7316 (AU) GILLETT, John, David Burnie, TAS 7320 (AU) SCUKOVIC, Jack Ridgley, TAS 7321 (AU) BENNETT, Allan, John Burnie, TAS 7320 (AU) (74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät  Maximilianstrasse 58 D-80538 München D-80538 München (DE)