Methods and systems for utilizing waste sources of metal oxides

Details Methods and systems for utilizing waste sources of metal oxides Methods and systems for utilizing waste sources of metal oxides

C - Chemistry, Metallurgy

01

F

C01F 11/18 (2006.01) C01F 5/24 (2006.01)

Patent

CA 2700715

Methods are provided for producing a composition comprising carbonates, wherein the methods comprise utilizing waste sources of metal oxides. An aqueous solution of divalent cations, some or all of which are derived from a waste source of metal oxides, may be contacted with CO2 and subjected to precipitation conditions to provide compositions comprising carbon-ates. In some embodiments, a combustion ash is the waste source of metal oxides for the aqueous solution containing divalent cations. In some embodiments, a combustion ash is used to provide a source of proton-removing agents, divalent cations, silica, metal oxides, or other desired constituents or a combination thereof.

L'invention concerne des procédés de production d'une composition qui comporte des carbonates, les procédés comportant l'utilisation de sources de déchets d'oxydes métalliques. Une solution aqueuse de cations divalents, dont certains ou tous sont obtenus à partir d'une source de déchets d'oxydes métalliques, peut être mise en contact avec du CO2 et soumise à des conditions de précipitation pour obtenir des compositions comportant des carbonates. Dans certains modes de réalisation, une cendre de combustion est la source de déchets d'oxydes métalliques pour la solution aqueuse contenant des cations divalents. Dans dautres modes de réalisation, une cendre de combustion est utilisée pour fournir une source d'agents éliminateurs de protons, de cations divalents, de silice, d'oxydes métalliques ou d'autres constituants souhaités, ou une combinaison de ceux-ci.

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