PRODUCTION OF CARBONATE-CONTAINING COMPOSITIONS FROM MATERIAL COMPRISING METAL SILICATES
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Abstract
Provided are methods for producing carbonate-containing compositions comprising silicon-based material (e.g., pozzolanic material) from a source of carbon dioxide, a divalent cation-containing solution, and a source of proton-removing agents. In such methods, divalent cations of the divalent cation-containing solution are provided by digestion of material comprising metal silicates. Also provided are methods for producing carbonate-containing compositions comprising little or no silicon-based material. In such methods, silicon-based material (e.g., silica, unreacted or undigested silicates, aluminosilicates, etc.) may be separated and processed separately from carbonate-containing compositions. Silicon-based material and carbonate-containing material may be blended at a later stage to produce a pozzolanic material, which may be further processed and blended with, for example, Portland cement.
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Citations
120 Claims
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1-93. -93. (canceled)
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94. A method comprising:
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a) digesting a calcium-containing rock or mineral with an aqueous solution to produce calcium cations and a material comprising SiO2; b) reacting the calcium cations with dissolved carbon dioxide to produce a precipitation material in a precipitation reaction mixture; and c) separating the precipitation material from the precipitation reaction mixture to produce a separated precipitation material and a supernatant. - View Dependent Claims (108, 109, 110, 111, 112, 113, 114)
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115. A system comprising:
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a) a processor for processing a material comprising a metal silicate; b) a precipitation reactor for precipitating a precipitation material, wherein the precipitation reactor is configured to receive carbon dioxide from an industrial source of carbon dioxide; and c) a liquid-solid separator for separating a supernatant and the precipitation material from a precipitation reaction mixture, wherein the liquid-solid separator is configured with a baffle or a spiral channel, wherein the precipitation reactor is operably connected to both the processor and the liquid-solid separator. - View Dependent Claims (116, 117, 118, 119, 120)
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Specification