Methods and systems for utilizing waste sources of metal oxides
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United States of America Patent
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Feb 16, 2016
Grant Date -
Sep 19, 2013
app pub date -
May 6, 2013
filing date -
Dec 28, 2007
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Abstract
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 carbonates. 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.
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