METHOD AND APPARATUS FOR PRODUCING CALCIUM CARBONATE

To provide a method for producing calcium carbonate by immobilizing carbon dioxide as calcium carbonate by a safe and simple method.SOLUTION: A method for producing calcium carbonate disclosed herein includes the following steps: a step (S1) of preparing a slurry containing calcium hydroxide and a s...

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Bibliographic Details
Main Authors OHASHI TAKAYUKI, YOSHINO YASUSHI
Format Patent
LanguageEnglish
Japanese
Published 03.03.2023
Subjects
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
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Summary:To provide a method for producing calcium carbonate by immobilizing carbon dioxide as calcium carbonate by a safe and simple method.SOLUTION: A method for producing calcium carbonate disclosed herein includes the following steps: a step (S1) of preparing a slurry containing calcium hydroxide and a step (S2) of depositing calcium carbonate in a slurry containing calcium hydroxide by feeding carbon dioxide into the slurry containing calcium hydroxide by generating microbubbles containing carbon dioxide from a microbubble generator with a porous part having micropores in a container configured so that carbon dioxide is not released into the atmosphere. Here, the microbubble generator supplies a flow rate of carbon dioxide of 40 to 2500 ml/min per 1 mol of calcium hydroxide.SELECTED DRAWING: Figure 1 【課題】安全かつ簡便な方法によって、二酸化炭素を炭酸カルシウムとして固定化する炭酸カルシウムの製造方法を提供すること。【解決手段】ここに開示される炭酸カルシウム製造方法は、以下の工程を含む。水酸化カルシウムを含むスラリーを用意する工程（Ｓ１）と、二酸化炭素が大気に放出されないように構成された容器内において、微細気孔を有する多孔質部を備えた微細気泡発生装置から二酸化炭素を含む微細気泡を発生させて、水酸化カルシウムを含むスラリー中に二酸化炭素を供給することにより、炭酸カルシウムを析出させる工程（Ｓ２）。ここで、微細気泡発生装置は、水酸化カルシウム１ｍｏｌあたりに対して、二酸化炭素の流量が４０～２５００ｍｌ／ｍｉｎとなるように供給する。【選択図】図１
Bibliography:Application Number: JP20210134690