M+FLO-LDH chemical desalting mechanism: The mechanism of salt removal is based on the characteristics of interlayer anion exchange of LDHs/ layered compound metal hydroxide. In order to remove certain anion An-, the corresponding compound metal LDH-An- is added, and the reaction occurs under certain conditions such as temperature and PH. Anion in waterAn-（CO32-、SO42-、NO3-、PO43-、F-、Cl-... Plasma will ｒｅｐｌａｃｅ the OH- in the LDHs interlayer to form a layered bimetallic double salt precipitation containing An- anion and a small solubility product (e.g., calcium-aluminum LDH can remove CL- and SO42-), and through the coupled M+FLO magnetic flocculation precipitation deep water purification system, the effective removal of An- anion salt in water is realized. The general formula of LDHs chemical structure is 【M1-X2+MX3+(OH)2】X+(AX/Nn-).mH2O(M2+ is Mg2+、Zn2+、Ni2+、CO2+、Ca2+、Mn2+), etc. M3+为Fe3+、Cr3+、Sc3+、Al3+、V3+, etc. An- is the interlayer anion CO32-、NO3-、SO42-、PO43-、CrO42-、F-、Cl-、Br-, etc. x is the molar ratio of M3+/（M2++ M3+）; m is the molar amount of interlayer water.
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