(19)

(11)

EP 0 083 615 A1

(12)

(43) Date of publication: 20.07.1983 Bulletin 1983/29 (21) Application number: 82902101.0 (22) Date of filing: 08.07.1982

(51) International Patent Classification (IPC):  C22B 7/ 00( . ) C22B 9/ 02( . ) (86) International application number: PCT/SE1982/000238 (87) International publication number: WO 1983/000166 (20.01.1983 Gazette 1983/02)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 10.07.1981 SE 19810004304 (71) Applicant: Boliden Aktiebolag S-114 85 Stockholm (SE)	(72) Inventors: BJÖRLING, Karl Gotthard Emanuel S-182 63 Djursholm (SE) LINDKVIST, Göran S-932 00 Skelleftehamn (SE)