WO 2021/173022 A1

Process for separating the components of hardened concrete waste for producing recycled cement

(22) 23.02.2021

(43) 02.09.2021

(57) The present invention falls within the field of building materials and relates to a process for separating the components of hardened concrete for the purpose of extracting the cement fraction for use thereof in the production of heat activated recycled cement, said process involving the essential steps of: a) crushing the concrete waste; b) screening the crushed material and separating the material with a size of less than about 1 mm; c) fragmenting the material with a size of more than 1 mm; d) screening the material with a size of less than 1 mm into various grain size fractions; e) high-intensity magnetic separation of the material; f) grinding the cement fraction resulting from the magnetic separation of the previous step to a size that allows efficient heat activation thereof; and g) obtaining a heat activated recycled cement.

(71) Instituto Superior Tecnico, Av. Rovisco Pais, 1, 1049-001 Lisboa (PT); Instituto Politecnico de Setubal, Edificio Sede – Campus do Ips, 2910-761 Setubal (PT); Universidade do Porto, Praca Comes Teixeira, S/N, 4099-002 Porto (PT)

(84) ARIPO (BW, GIL GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BC, CII, CY, CZ, DE, DK, EE, ES, Ft, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CC, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)

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