Method for producing precipitated calcium carbonate using fowl egg shells
AssigneeEssentron. Co., Ltd.
InventorKyoung-Won Park
Life of this patent
Estimating the term…
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.
Claims7
A method for producing precipitated calcium carbonate using fowl egg shells, comprising:
- 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 to atmospheric air for 1 to 15 days to absorb moisture and thereby increase the yield of calcium hydroxide and then feeding the 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.
Dependencies are inferred from the claim text.