Method for manufacturing cement clinker using stainless steel slag
(22) 14.04.2023
(43) 19.10.2023
(57) In the method for manufacturing cement clinker raw materials which include at least one stainless steel slag material are calcined and burned to produce the cement clinker. Since cement clinker may only contain a limited amount of hexavalent chromium, the chromium content of the stainless steel slag material needs to be limited. This is achieved by solidifying the liquid steel slag so that it comprises a 5 sufficiently small amount of fines. These fines and/or the fines produced when crushing the coarser fraction of the steel slag to recover stainless steel are used as powdery stainless steel slag material for manufacturing cement clinker. It was found that these fines contain indeed considerably less chromium than the sand and the coarser aggregate fractions produced from the solidified stainless steel slag. By replacing the 10 conventional lime sources partially by the stainless steel slag material, carbon dioxide emissions and the energy requirements of the cement kiln can be reduced. The powdery stainless steel slag material also does not need to be finely ground and melts immediately in the rotary kiln.
(71) Orbix Production (BEBE), Genk (BE)
(84) ARIPO (BW, CV, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SC, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, 1E, IS, IT, LT, LU, LV, MC, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
