METHOD FOR SEPARATING ANIONS

PROBLEM TO BE SOLVED: To provide a method for separating anions, capable of efficiently separating only anions from a raw material liquid containing fluorine.SOLUTION: In an electrodialysis method in which an anion concentrate is separated by using an electrodialyser 1 having a structure in which ca...

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Bibliographic Details
Main Author TSUKAGOSHI TORU
Format Patent
LanguageEnglish
Japanese
Published 21.06.2018
Subjects
CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:PROBLEM TO BE SOLVED: To provide a method for separating anions, capable of efficiently separating only anions from a raw material liquid containing fluorine.SOLUTION: In an electrodialysis method in which an anion concentrate is separated by using an electrodialyser 1 having a structure in which cations in a raw material liquid do not migrate into a product liquid, cations that form a complex with fluorine is added to the raw material liquid and maintained at pH at which precipitation of added cations in the raw material liquid does not occur. Examples of the cations to be added to the raw material liquid include preferably at least one of aluminum ions, polyaluminum ions, zirconium oxide ions, calcium ions, magnesium ions, iron ions, scandium ions, gallium ions, gadolinium ions, indium ions, vanadium ions and lanthanum ions.SELECTED DRAWING: Figure 1 【課題】フッ素を含む原料液から、効率的に陰イオンのみを分離できる陰イオンの分離方法を提供する。【解決手段】原料液中の陽イオンが製品液中に移動しない構造の電気透析槽１を用いて陰イオン濃縮液を分離する電気透析法において、原料液中に、フッ素とともに錯体を形成する陽イオンを添加し、原料液中に添加した陽イオンの沈殿が生じないｐＨに維持する。なお、原料液中に添加する陽イオンとしては、例えば、アルミニウムイオン、ポリアルミニウムイオン、酸化ジルコニウムイオン、ジルコニウムイオン、カルシウムイオン、マグネシウムイオン、鉄イオン、スカンジウムイオン、ガリウムイオン、ガドリウムイオン、インジウムイオン、バナジウムイオンおよびランタンイオンのうちの少なくとも１種が好ましい。【選択図】図１
Bibliography:Application Number: JP20160243562