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1.发明公开
公开(公告)号：EP4410745A1
公开(公告)日：2024-08-07
申请号：EP22876106.0
申请日：2022-09-26
申请人： Sumitomo Osaka Cement Co., Ltd. , Yamaguchi University , Kyushu University, National University Corporation
发明人： KIKUCHI, Sadato , NAKAMURA, Shogo , OIZUMI, Risa , KONISHI, Masayoshi , HIGA, Mitsuru , TANIGUCHI, Ikuo
摘要： Provided is a method in which carbon dioxide can be efficiently fixed, calcium carbonate that is a valuable can be efficiently produced from carbon dioxide, and a waste gypsum board can be effectively recycled without being wasted as it is by using the waste gypsum board for fixing carbon dioxide. This method includes: a first step of bringing a first solution containing an alkali metal hydroxide and gas containing carbon dioxide into contact with each other to produce a second solution containing an alkali metal salt; and a second step of bringing the second solution and a gypsum-containing material into contact with each other to produce calcium carbonate.
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公开(公告)号：EP4397624A1
公开(公告)日：2024-07-10
申请号：EP22864621.2
申请日：2022-08-31
申请人： Sumitomo Osaka Cement Co., Ltd. , Yamaguchi University , Kyushu University, National University Corporation
发明人： KIKUCHI, Sadato , NAKAMURA, Shogo , OIZUMI, Risa , KONISHI, Masayoshi , HIGA, Mitsuru , TANIGUCHI, Ikuo
摘要： Provided is a calcium carbonate generation method and system in which calcium carbonate having a high purity can be generated using a calcium-containing waste. Provided is a calcium carbonate generation method of generating calcium carbonate from a calcium-containing waste, the calcium carbonate generation method including: a calcium dissolution step of adding aqueous hydrochloric acid to a calcium-containing waste and dissolving calcium to generate an aqueous solution containing a calcium ion; a separation step of adjusting a hydrogen ion concentration index of the aqueous solution containing a calcium ion and separating a component containing at least one selected from the group consisting of Si, Al, Mg, and heavy metal from the aqueous solution; and a calcium carbonate collection step of generating calcium carbonate using an aqueous solution obtained in the separation step and an aqueous solution containing potassium carbonate and/or sodium carbonate.
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