White carbonatable calcium silicate-based cements and methods of preparation and use thereof
AssigneeSolidia Technologies, Inc.
InventorsSadananda Sahu, Sean Quinn, Anuj Seth, Jayson Bryant, Deepak Ravikumar
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Abstract
The invention provides a new class of carbonatable calcium silicate-based, white clinkers and the ground cement produced from these clinkers, as well as methods of their production and use thereof. The disclosed white clinkers and the ground cement exhibit a high brightness and are suitable for use in products with high aesthetic considerations.
Claims27
A white carbonatable calcium silicate cement composition, comprising:
- one or more discrete calcium silicate phases selected from CS (wollastonite or pseudowollastonite), C3S2 (rankinite), C2S (belite, larnite, bredigite), and an amorphous calcium silicate phase, wherein the one or more discrete calcium silicate phases form about 30% or more by mass of the total phases, and wherein
- elemental Ca and elemental Si are present in the composition at a molar ratio from about 0.8 to about 1.2;
- and
- metal oxides of Al, Fe and Mg are present at about 30% or less by mass, wherein the total color-imparting oxides of one or more of metals selected from Fe, Ti, Mn and Cr are present about 2.5% or less by mass of the total cement composition, wherein the cement composition is characterized by a reflectance value (L*) of greater than about 85%.
A method for producing a white carbonatable calcium silicate cement, comprising:
- providing a raw material set comprising CaO and SiO2;
- grinding the raw material set to obtain a precursor mixture, wherein the molar ratio of CaO to SiO2 is from about 0.8 to about 1.2, wherein the precursor mixture comprises:
- (i) less than about 21.2% by mass the oxides of Al, Fe and Mg, and (ii) less than about 1.5% by mass metal oxides of one or more metals selected from Fe, Ti, Mn and Cr;
- firing the precursor mixture to a temperature in the range from about 800° C. to about 1,400° C. to obtain a white carbonatable calcium silicate clinker;
- and
- grinding the white carbonatable calcium silicate clinker to a fineness of about 200 to about 800 m2/kg to produce the white carbonatable calcium silicate cement having a reflectance value (L*) of greater than about 85%.
The method of 16, wherein firing the precursor mixture is performed at a temperature between about 1,300° C. to about 1,400° C.
The method of 16, wherein after firing the white carbonatable calcium silicate clinker is subjected to cooling by forced air in the range of about 1,400° C. to about 500° C. under an uncontrolled atmosphere.
The method of 16, wherein after firing the white carbonatable calcium silicate clinker is subjected to cooling by forced air in the range of about 1,400° C. to about 500° C. under a reducing atmosphere.
The method of 16, wherein after firing the white carbonatable calcium silicate clinker is subjected to a cooling in the range of about 1,400° C. to about 500° C. by quenching in water.
The method of 16, wherein grinding the raw material set to obtain a precursor mixture is performed in a grinder with a steel grinding surface.
The method of 16, wherein grinding the white carbonatable calcium silicate clinker achieves a fineness of about 200 m2/kg to about 400 m2/kg to produce the white carbonatable calcium silicate cement.
The method of 16, wherein grinding the white carbonatable calcium silicate clinker achieves a fineness of about 400 m2/kg to about 800 m2/kg to produce the white carbonatable calcium silicate cement.
The method of 26, wherein grinding the white carbonatable calcium silicate clinker achieves a fineness of about 400 m2/kg to about 600 m2/kg to produce the white carbonatable calcium silicate cement.
Dependencies are inferred from the claim text.