Carbonatable calcium silicate compositions and methods thereof
First Claim
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1. A carbonatable calcium silicate composition in powder form having a mean particle size (d50) of about 8 μ
- m to about 25 μ
m, with 10% of particles (d10) sized below about 0.1 μ
m to about 3 μ
m, and 90% of particles (d90) sized above about 35 μ
m to about 100 μ
m, wherein the composition comprises;
calcium silicate in the form of one or more discrete crystalline calcium silicate phases selected from CS (wollastonite or pseudowollastonite), C3S2(rankinite), and C2S (belite, larnite, bredigite), andcalcium silicate in the form of an amorphous calcium silicate phase,wherein the one or more discrete crystalline calcium silicate phases are present at about 30% or more by mass of the total phases;
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 in the composition at about 30% or less by mass,wherein the composition is carbonatable with CO2 at a temperature of about 30°
C. to about 90°
C. to form CaCO3 with a mass gain of about 10% or more.
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Abstract
The invention provides novel carbonatable calcium silicate compositions and carbonatable calcium silicate phases that are made from widely available, low cost raw materials by a process suitable for large-scale production. The method of the invention is flexible in equipment and production requirements and is readily adaptable to manufacturing facilities of conventional cement. The invention offers an exceptional capability to permanently and safely sequesters CO2.
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Citations
12 Claims
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1. A carbonatable calcium silicate composition in powder form having a mean particle size (d50) of about 8 μ
- m to about 25 μ
m, with 10% of particles (d10) sized below about 0.1 μ
m to about 3 μ
m, and 90% of particles (d90) sized above about 35 μ
m to about 100 μ
m, wherein the composition comprises;calcium silicate in the form of one or more discrete crystalline calcium silicate phases selected from CS (wollastonite or pseudowollastonite), C3S2(rankinite), and C2S (belite, larnite, bredigite), and calcium silicate in the form of an amorphous calcium silicate phase, wherein the one or more discrete crystalline calcium silicate phases are present at about 30% or more by mass of the total phases; 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 in the composition at about 30% or less by mass, wherein the composition is carbonatable with CO2 at a temperature of about 30°
C. to about 90°
C. to form CaCO3 with a mass gain of about 10% or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- m to about 25 μ
Specification