Method for producing precipitated calcium carbonate using fowl egg shells
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United States of America Patent
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Jul 21, 2015
Grant Date -
Feb 13, 2014
app pub date -
Mar 16, 2012
filing date -
Mar 25, 2011
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Abstract
The present invention relates to a method for producing precipitated calcium carbonate using fowl egg shells such as chicken egg shells. More particularly, the method comprises: a heat treatment step of heating fowl egg shells; a grinding step of grinding calcium oxide generated in the heat treatment step; a dry-quenching step of feeding the ground calcium oxide into a thermo-hygrostat to convert the ground calcium oxide into dry calcium hydroxide powder; a carbonizing step of mixing the dry calcium hydroxide powder prepared in the dry-quenching step with an organic solvent and feeding carbon dioxide generated in the heat treatment step into the mixture; and a filtering and drying step of filtering and drying the calcium carbonate obtained in the carbonizing step.
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