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CALCIUM CARBONATE GENERATION METHOD AND SYSTEM
Provided are a calcium carbonate generation method and a system that make it possible to use calcium-containing waste to generate high-purity calcium carbonate. According to the present invention, a calcium carbonate generation method that generates calcium carbonate from calcium-containing waste is characterized by having a calcium dissolution step for adding aqueous hydrochloric acid to the calcium-containing waste to dissolve the calcium and generate an aqueous solution that includes calcium ions, a separation step for adjusting a hydrogen ion concentration index for the aqueous solution that includes the calcium ions and separating a component that includes at least one substance selected from the group that consists of Si, Al, Mg, and heavy metals from the aqueous solution, and a calcium carbonate recovery step for using the aqueous solution obtained via the separation step and an aqueous solution that includes potassium carbonate and/or sodium carbonate to generate calcium carbonate.
CALCIUM CARBONATE GENERATION METHOD AND SYSTEM
Provided are a calcium carbonate generation method and a system that make it possible to use calcium-containing waste to generate high-purity calcium carbonate. According to the present invention, a calcium carbonate generation method that generates calcium carbonate from calcium-containing waste is characterized by having a calcium dissolution step for adding aqueous hydrochloric acid to the calcium-containing waste to dissolve the calcium and generate an aqueous solution that includes calcium ions, a separation step for adjusting a hydrogen ion concentration index for the aqueous solution that includes the calcium ions and separating a component that includes at least one substance selected from the group that consists of Si, Al, Mg, and heavy metals from the aqueous solution, and a calcium carbonate recovery step for using the aqueous solution obtained via the separation step and an aqueous solution that includes potassium carbonate and/or sodium carbonate to generate calcium carbonate.
CALCIUM CARBONATE GENERATION METHOD AND SYSTEM
KIKUCHI SADATO (author) / NAKAMURA SHOGO (author) / OIZUMI RISA (author) / KONISHI MASAYOSHI (author) / HIGA MITSURU (author) / TANIGUCHI IKUO (author)
2024-03-07
Patent
Electronic Resource
English
IPC:
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
B09B
DISPOSAL OF SOLID WASTE
,
Beseitigung von festem Abfall
/
C01D
Verbindungen der Alkalimetalle, d.h. des Lithiums, Natriums, Kaliums, Rubidiums, Cäsiums oder Franciums
,
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
/
C04B
Kalk
,
LIME
| European Patent Office | 2024
| European Patent Office | 2017