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Carbonatable calcium silicate compositions and methods thereof

  • US 10,611,690 B2
  • Filed: 11/19/2018
  • Issued: 04/07/2020
  • Est. Priority Date: 08/04/2014
  • Status: Active Grant
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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