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(11)

EP 4 058 612 A1

(12)

(43) Date of publication: 21.09.2022 Bulletin 2022/38 (21) Application number: 19920627.7 (22) Date of filing: 15.11.2019

(51) International Patent Classification (IPC):  C22B 3/02(2006.01) C01D 15/02(2006.01) C22B 3/14(2006.01) C22B 26/12(2006.01) C22B 3/12(2006.01) (52) Cooperative Patent Classification (CPC): C01D 15/02; C22B 3/02; C22B 3/12; C22B 26/12; Y02P 10/20; C01F 11/18 (86) International application number: PCT/FI2019/050821 (87) International publication number: WO 2021/094647 (20.05.2021 Gazette 2021/20)

(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 (71) Applicant: Metso Outotec Finland Oy 33900 Tampere (FI)	(72) Inventors: TIIHONEN, Marika 02240 Espoo (FI) KINNUNEN, Sami 28130 Pori (FI) KOLEHMAINEN, Eero 28660 Pori (FI) (74) Representative: Laine IP Oy  Porkkalankatu 24 00180 Helsinki 00180 Helsinki (FI)