(19)

(11)

EP 1 069 935 A1

(12)

(43) Date of publication: 24.01.2001 Bulletin 2001/04 (21) Application number: 99911843.3 (22) Date of filing: 29.03.1999

(51) International Patent Classification (IPC)7: B01D 33/76 (86) International application number: PCT/FI9900/258 (87) International publication number: WO 9949/951 (07.10.1999 Gazette 1999/40)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 30.03.1998 FI 980713 (71) Applicant: Outokumpu Oyj 02200 Espoo (FI)	(72) Inventor: VILO, Jaakko FIN-20300 Turku (FI) (74) Representative: Zipse + Habersack  Wotanstrasse 64 80639 München 80639 München (DE)