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)


Related articles:

Issue 9/2016 WO 2016/115398 A1

Controlled process for precipitating calcium carbonate and vaterite precipitated calcium carbonate compositions formed by said process

(22) 14.01.2016 (43) 21.07.2016 (57) A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at...

Issue 11/2017 US 2017/0182456 A1

Aqueous lime slurry, preparation process and uses

(22) 23.02.2017 (43) 29.06.2017 (57) Preparation of aqueous slurries of calcium dihydroxide. Preparation of aqueous suspensions of calcium hydroxide. (71) Coatex, Genay (FR) (73) Coatex, Genay (FR)

Issue 9/2017 US 2017/0159238 A1

Method for utilizing lignin separated from black liquor as lime-kiln fuel

(22) 26.05.2015 (43) 08.06.2017 (57) A method of utilizing lignin-containing material separated from spent kraft pulping liquor including: acidifying the liquor to a pH not less than seven thereby...

Issue 10/2017 PL1957423 (T3)

Method and apparatus for treating lime mud

(22) 21.11.2006 (43) 30.06.2017 (57) Summary of corresponding patent WO2007057512 (A2): A method for feeding lime mud into a lime kiln including a rotary kiln shell having an interior between a first...

Issue 12/2017 US2017291851 (A1)

Method and arrangement for burning lime mud

(22) 09.05.2017 (43) 12.10.2017 (57) An arrangement for burning lime mud into lime in a lime kiln. The lime mud flows counter-currently to flue gases from a feed end to a firing end and the fuel used...