SEPARATION METHOD OF POTASSIUM ION CONCENTRATED SOLUTION AND MAGNESIUM ION CONCENTRATED SOLUTION, MANUFACTURING METHOD OF POTASSIUM CHLORIDE-CONTAINING CRYSTAL AND MANUFACTURING METHOD OF MAGNESIUM CHLORIDE CONCENTRATED SOLUTION

• Main Authors: KARUBE TOMOHIKO, MURAKAMI TAIHEI
• Format: Patent
• Language: English; Japanese
• Published: 02.04.2020
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

To provide a potassium ion concentrated solution from which high-purity potassium chloride-containing crystal can be obtained, and to provide a separation method of magnesium ion concentrated solution by which high-purity magnesium chloride concentrated solution can be obtained.SOLUTION: A separation method of potassium ion concentrated solution and magnesium ion concentrated solution includes a process of depositing a crystal from salt-making bittern which contains potassium ion and magnesium ion at a rate of magnesium ion 1.0 mol or more per potassium ion 1.0 mol and a process of dissolving the crystal into water and treating the crystal by means of an ion exchange membrane electric dialyzer to which bivalent positive ion hardly permeable membrane is attached.SELECTED DRAWING: None 【課題】本発明は、高純度の塩化カリウム含有結晶が得られるカリウムイオン濃縮溶液及び高純度の塩化マグネシウム濃縮溶液が得られるマグネシウムイオン濃縮溶液の分離方法を提供することを解決すべき課題としている。【解決手段】カリウムイオン１．０モルあたりマグネシウムイオン１．０モル以上の比率でカリウムイオン及びマグネシウムイオンを含有する製塩苦汁から結晶を析出させる工程と、前記結晶を水に溶解させ、２価陽イオン難透過性膜を装着したイオン交換膜電気透析装置にて処理する工程を有する、カリウムイオン濃縮溶液及びマグネシウムイオン濃縮溶液の分離方法。【選択図】なし