WO 2021/080870 A2

Method of making purified precipitated calcium carbonate from lime mud

(22) 16.10.2020

(43) 29.04.2021

(57) A method of making a purified precipitated calcium carbonate from lime mud can include admixing a lime mud cake with water and sodium carbonate to form a first slurry; heating the first slurry under conditions to age the slurry and form one or more of pirssonite, shortite, and gaylussite; separating a solid portion from the aged slurry; washing the solid portion under conditions sufficient to decompose the one or more of pirssonite, shortite, and gaylussite to a CaCO3 solid fraction and Na2CO3 solid fraction and to remove sodium salts; and admixing the CaCO3 solid fraction with water and a dispersant to disperse the CaCO3 solid fraction in water and form a dispersed slurry having a Brookfield viscosity of less than about 1000 cps at 100 rpm, thereby producing a dispersed slurry containing the purified precipitated calcium carbonate.

(71) Specialty Minerals (Michigan) Inc., 30600 Telegraph Road, Bingham Farms, MI 48025 (US)

(84) ARIPO (BW, GH, 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, BG, CH, CY, CZ, DE, DK, EE, ES, FI, 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, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)

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