(19)

(11)

EP 4 171 831 A1

(12)

(43) Date of publication: 03.05.2023 Bulletin 2023/18 (21) Application number: 21833927.3 (22) Date of filing: 23.06.2021

(51) International Patent Classification (IPC):  B03D 1/14(2006.01) B03D 1/02(2006.01) B03D 1/16(2006.01) (52) Cooperative Patent Classification (CPC): B03D 1/02; B03D 1/14; B03D 1/16; B03D 1/08 (86) International application number: PCT/FI2021/050487 (87) International publication number: WO 2022/003243 (06.01.2022 Gazette 2022/01)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 30.06.2020 US 202063046059 P (71) Applicant: Metso Outotec Finland Oy 33900 Tampere (FI)	(72) Inventors: SHERRELL, Ian 33900 Tampere (FI) RINNE, Antti 33900 Tampere (FI) (74) Representative: Papula Oy  P.O. Box 981 00101 Helsinki 00101 Helsinki (FI)