Methods and systems for utilizing calcium compound from calcined limestone
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United States of America Patent
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Mar 26, 2024
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Jan 21, 2021
app pub date -
Jul 20, 2020
filing date -
Jul 21, 2019
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Abstract
Provided herein are methods comprising a) calcining limestone in a cement plant to form carbon dioxide and calcium compound selected from calcium oxide, calcium hydroxide, or combination thereof; b) treating the calcium compound with N-containing salt in water to produce an aqueous solution comprising calcium salt and N-containing salt; and c) contacting the aqueous solution with the carbon dioxide under one or more precipitation conditions to produce a precipitation material comprising calcium carbonate and a supernatant aqueous solution wherein the calcium carbonate comprises vaterite.
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