CALCIUM CARBONATE PRODUCTION METHOD AND PRODUCTION SYSTEM

WIPO Patent Application WO/2024/053678

A1

Provided are a production method and a production system of calcium carbonate that utilize a calcium-containing waste and can control the alkali content in the obtained calcium carbonate.　The calcium carbonate production method for producing calcium carbonate from a calcium-containing waste includes: a calcium dissolution step for adding an aqueous hydrochloric acid solution to the calcium-containing waste and dissolving calcium to prepare an aqueous solution containing calcium ions; a separation step for adjusting the hydrogen ion concentration index of the aqueous solution containing calcium ions to separate Mg, etc. from the aqueous solution; and a calcium carbonate preparation step for adding an aqueous solution containing potassium carbonate and/or sodium carbonate to the aqueous solution containing calcium ions obtained in the separation step and reacting to prepare calcium carbonate. In this calcium carbonate production method (system), in the calcium carbonate preparation step, the rate of the addition of the aqueous solution containing potassium carbonate and/or sodium carbonate is controlled so as to adjust κ, which is represented by a specific formula, to 3000 or less.

KIKUCHI SADATO (JP)
OIZUMI RISA (JP)
KONISHI MASAYOSHI (JP)
HIGA MITSURU (JP)
TANIGUCHI IKUO (JP)

PCT/JP2023/032545

March 14, 2024

September 06, 2023

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SUMITOMO OSAKA CEMENT CO LTD (JP)
UNIV YAMAGUCHI (JP)
UNIV KYUSHU NAT UNIV CORP (JP)

C01F11/18; B09B3/70

US20200239978A1	2020-07-30
JP2008143765A	2008-06-26
US20210017035A1	2021-01-21
JP2007117966A	2007-05-17

"Laboratory of Experimental Chemistry 5, Basic Technology for Chemical Experiments, 5th Edition", 2005, MARUZEN CO., LTD., pages: 29 - 30

TAMURA Chikashi et al. (JP)

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