Process and device for extracting ions from a clear liquid or one containing suspended matter by bringing it into contact with an exchanger.

摘要

The present invention relates to a process and an apparatus for continuously extracting ions from a clear liquid or a liquid containing materials in suspension, by means of a bed of grains of exchange substances. The process comprises maintaining the bed in a permanent condition of fluidization by an absolutely continuous feed of liquid, and subjecting the bed to cyclic pulsation phenomena in such a way as to ensure grading of the grains on the basis of density, in dependence on their ion charge. To carry out that process, an apparatus comprises a fluidization column which does not have any plate capable of interfering with the grading operation, a pulsation generator which operates by taking off liquid at the top of the column and re-injecting it in a surge manner at the base of the bed, and a system for centrifuging the liquid to be treated, for removing the sandy materials therefrom. This process and apparatus are used when there is a wish to extract any type of anions or cations or exchangeable salts, in an absolutely continuous mode of operation, from clear liquids or liquids containing materials in suspension, by means of mineral exchange substances or resins, to avoid the problems of clogging and abrasion, and to achieve the maximum extraction capacity and rate.