WO 2016/184004 A1

Cement grinding aid prepared by using waste antifreeze

(22) 29.09.2015

(43) 24.11.2016

(57) A cement grinding aid prepared by using waste antifreeze. The cement grinding aid comprises the following components by weight: 20–75 parts of pretreated waste antifreeze, 5–40 parts of alkanolamine, 1–5 parts of an acid solution, 3–12 parts of saccharide and 15–50 parts of water. The pre-treatment of the waste antifreeze is: adding an alkaline solution into the waste antifreeze for adjusting the pH value, then adding flocculant, stirring and then standing; separating the upper layer oil, then filtering for removing the flocculent precipitates, and obtaining the clear mixed solution.

(71) Nanjing University of Technology, Jiangsu 210009 (CN)

(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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