Title:
CALCIUM CARBONATE GENERATION METHOD AND SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/033039
Kind Code:
A1
Abstract:
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.
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Inventors:
KIKUCHI SADATO (JP)
NAKAMURA SHOGO (JP)
OIZUMI RISA (JP)
KONISHI MASAYOSHI (JP)
HIGA MITSURU (JP)
TANIGUCHI IKUO (JP)
NAKAMURA SHOGO (JP)
OIZUMI RISA (JP)
KONISHI MASAYOSHI (JP)
HIGA MITSURU (JP)
TANIGUCHI IKUO (JP)
Application Number:
PCT/JP2022/032756
Publication Date:
March 09, 2023
Filing Date:
August 31, 2022
Export Citation:
Assignee:
SUMITOMO OSAKA CEMENT CO LTD (JP)
UNIV YAMAGUCHI (JP)
UNIV KYUSHU NAT UNIV CORP (JP)
UNIV YAMAGUCHI (JP)
UNIV KYUSHU NAT UNIV CORP (JP)
International Classes:
C01F11/18; B09B3/70; C01D7/32; C04B7/60
Domestic Patent References:
| WO2014007331A1 | 2014-01-09 |
Foreign References:
| JP2001026418A | 2001-01-30 | |||
| JP2003027153A | 2003-01-29 | |||
| JP2019527178A | 2019-09-26 | |||
| JP2006263651A | 2006-10-05 | |||
| JP2015506413A | 2015-03-02 | |||
| JP2005246226A | 2005-09-15 |
Attorney, Agent or Firm:
TAMURA Chikashi et al. (JP)
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