PREPARATION METHOD FOR NANOPRECIPITATED CALCIUM CARBONATE HAVING CORE-SHELL STRUCTURE

A preparation method for nanoprecipitated calcium carbonate having a core-shell structure, comprising the following steps: (1) the preparation of core-nanoprecipitated calcium carbonate: calcining low-grade limestone to obtain quicklime, digesting and removing slag, and adjusting the solid content o...

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Bibliographische Detailangaben
Hauptverfasser:	ZHU, Yong, LIANG, Ming, LIU, Songhao, MO, Yinggui
Format:	Patent
Sprache:	chi ; eng ; fre
Schlagworte:	CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS INORGANIC CHEMISTRY METALLURGY
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Beschreibung
Zusammenfassung:	A preparation method for nanoprecipitated calcium carbonate having a core-shell structure, comprising the following steps: (1) the preparation of core-nanoprecipitated calcium carbonate: calcining low-grade limestone to obtain quicklime, digesting and removing slag, and adjusting the solid content of a first lime slurry; delivering the first lime slurry into a carbonation tower for a carbonation reaction to obtain a core-nanoprecipitated calcium carbonate suspension; (2) the coating of the shell: calcining high-grade limestone to obtain quicklime, digesting and removing slag, and adjusting the solid content of a second lime slurry; to coat a shell, mixing the core-nanoprecipitated calcium carbonate suspension with 10-30 wt.% of the second lime slurry, and preparing a suspension of nanoprecipitated calcium carbonate having a core-shell structure by employing a method of carbonation or a method of aging; obtaining nanoprecipitated calcium carbonate having a core-shell structure after post-treatment. The prepara