Molten salt synthesis for manufacture of cement precursors

(22) 08.11.2013

(43) 22.10.2015

(57) A method of manufacturing calcium silicates, calcium aluminates, calcium aluminosilicates and calcium ferrites and the products thereby derived utilizing molten-salt synthesis and/or molten-salt sintering. Molten-salt synthesis enables efficiently manufacture calcium silicate (Ca–SiO₃), dicalcium silicate (Ca₂SiO₄), tricalcium disilicate (Ca₃Si₂O₇) and related compounds such as calcium aluminate (CaAl₂O₄), Gehlenite (Ca₂Al₂–SiO₇) and tetracalcium aluminoferrite (Ca₄Al₂Fe₂O_O10) at temperatures in the range of about 400-750° C. The composition of the synthesized product(s) can be varied by altering the ratio of the precursor compounds and by changing the molten-salt composition, whether used as a sintering flux or molten bath, resulting in the ability to manufacture calcium silicates and related compounds for a wide variety of uses, but most specifically as precursors to the manufacture of hydraulic cements or for use in hydraulic cements such as Portland cements and calcium aluminate and other cements.

(71) Verdant Cement LLC, Wilmette, IL (US)