(19)

(11)

EP 1 771 251 A1

(12)

(43) Date of publication: 11.04.2007 Bulletin 2007/15 (21) Application number: 05736325.1 (22) Date of filing: 12.04.2005

(51) International Patent Classification (IPC):  B02C 2/04(2006.01) (86) International application number: PCT/FI2005/050116 (87) International publication number: WO 2005/102530 (03.11.2005 Gazette 2005/44)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR Designated Extension States: HR (30) Priority: 26.04.2004 FI 20040585 (71) Applicant: Metso Minerals (Tampere) Oy 33101 Tampere (FI)	(72) Inventors: NIEMINEN, Ilpo FI-33450 SIIVIKKALA (FI) LEHTONEN, Harri FI-33980 Pirkkala (FI) (74) Representative: Langenskiöld, Tord Karl Walter et al Oy Jalo Ant-Wuorinen Ab, Iso-Roobertinkatu 4-6 A 00120 Helsinki 00120 Helsinki (FI)