Patent ID: 8333944
Filing Date: 2012-12-18
Classification: B01D,C01B,C01F,C01P,C02F,C04B,Y02C,Y02E,Y02P,Y02W

Abstract:
1. A method, comprising: treating at least a portion of flue gas emitted from a cement plant, wherein said flue gas comprises carbon dioxide, with a proton removing agent to produce a solution comprising carbonate ions; treating said solution with alkaline-earth-metal-ions to produce a carbonate precipitate comprising metastable compound selected from the group consisting of vaterite, amorphous calcium carbonate, and combination thereof, under one or more of precipitation conditions comprising precipitation facilitator, pH, temperature, additive, ion ratio, rate of precipitation, mixing rate, presence of seed crystals, catalysts, membranes or substrates, batch or continuous protocol, or combination thereof; and producing a building material directly from at least a portion of said precipitate, wherein said building material is a cement composition comprising metastable compound selected from the group consisting of vaterite, amorphous calcium carbonate, and combination thereof.