How was the saltwater refining process developed?

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Until the mid-1970s, the traditional flocculation-sedimentation process for brine purification saw virtually no significant development； The current saltwater purification process used for ion-exchange membrane electrolysis is developed by adding advanced techniques such as secondary filtration and secondary purification to the aforementioned method ； The process flow is as follows: Saturated brine is mixed with a refining reagent; after the refining reaction, a flocculant is added and the mixture is sent to a clarification tank for clarification. The clarified brine is first filtered roughly through a sand filter, and then subjected to a second filtration step using an α-cellulose-coated carbon tube filter, which reduces the suspended solids in the brine to less than 1 ppm. Subsequently, the brine enters an ion exchange resin tower for further refinement, resulting in refined brine that meets the requirements for use in ion membrane electrolyzers