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(11)

EP 4 798 554 A1

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(43) Date of publication: 02.09.2026 Bulletin 2026/36 (21) Application number: 24783756.0 (22) Date of filing: 09.10.2024

(51) International Patent Classification (IPC):  C04B 35/04(2006.01) C04B 35/626(2006.01) C01F 5/00(2006.01) C04B 35/636(2006.01) (52) Cooperative Patent Classification (CPC): C04B 35/04; C04B 35/6261; C04B 35/636; C04B 35/6365; C04B 2235/6567; C04B 2235/449; C04B 2235/3206; C04B 2235/5436; C04B 2235/5454; C04B 2235/786; C04B 2235/77; C04B 2235/80; C01P 2002/60; C01F 5/06; C01P 2006/80; C01P 2004/51; C01P 2004/61 (86) International application number: PCT/EP2024/078362 (87) International publication number: WO 2025/087692 (01.05.2025 Gazette 2025/18)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 27.10.2023 EP 23206323 (71) Applicant: Refractory Intellectual Property GmbH & Co. KG 1100 Wien (AT)	(72) Inventors: NAVES MORAES, Matheus 30575-080 Belo Horizonte, MG (BR) REZENDE NOGUEIRA, Gustavo Geraldo 35680-149 Itauna, MG (BR) (74) Representative: Berkenbrink, Kai-Oliver et al Patentanwälte Becker & Müller Turmstrasse 22 40878 Ratingen 40878 Ratingen (DE)