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JP2014148432A Process for producing calcium carbonate and apparatus for producing calcium carbonate 审中-公开
标题翻译：生产碳酸钙的方法和生产碳酸钙的装置
公开(公告)号：JP2014148432A
公开(公告)日：2014-08-21
申请号：JP2013017455
申请日：2013-01-31
申请人： Nippon Concrete Ind Co Ltd , 日本コンクリート工業株式会社 , Akihiro Yamazaki , 章弘山崎 , Atsushi Iizuka , 淳飯塚
发明人： YAMAZAKI AKIHIRO , IIZUKA ATSUSHI , HAYAKAWA YASUYUKI , HONMA MASAHITO , YOSHIDA HIROYUKI
IPC分类号： C01F11/18 , C02F11/00
摘要： PROBLEM TO BE SOLVED: To provide a process for producing calcium carbonate which enables production of calcium carbonate of high purity from concrete waste containing unsolidified cement fine particles.SOLUTION: The concrete waste is subjected to solid-liquid separation by solid-liquid separation means 2, and is separated into a cement-containing liquid, which includes at least a part of cement fine particles, and a solid content. Furthermore, the cement-containing liquid is supplied into a precipitation reaction tank 10 by cement-containing liquid supplying means 11, and carbon dioxide is supplied into the precipitation reaction tank 10 by carbon dioxide supplying means 14. Then, in the precipitation reaction tank 10, calcium contained in the cement-containing liquid and cement fine particles is reacted with carbon dioxide, and calcium carbonate is allowed to crystallize out on the surface of the cement fine particles. Further, the thus crystallized calcium carbonate is separated and recovered by calcium carbonate separation means 4.
摘要翻译：要解决的问题：提供一种生产碳酸钙的方法，其能够从含有未固化的水泥细颗粒的混凝土废料中制备高纯度的碳酸钙。解决方案：混凝土废料通过固液分离装置2进行固液分离并分离成包含水泥微粒的至少一部分的固含量的含水泥液体。此外，含水泥液体由含水泥液体供给单元11供给到析出反应槽10中，二氧化碳通过二氧化碳供给单元14供给到沉淀反应槽10.然后，在析出反应槽10 ，含水泥液体中含有的钙和水泥微粒与二氧化碳反应，使碳酸钙在水泥微粒表面析出。此外，这样结晶的碳酸钙由碳酸钙分离装置4分离和回收。

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