PROCEDE POUR ELIMINER LE FLUORURE D'UNE SOLUTION OU SUSPENSION CONTENANT DU ZINC, SOLUTION DE SULFATE DE ZINC DEFLUORE ET SON UTILISATION AINSI QUE PROCEDE POUR PRODUIRE DU ZINC ET DU FLUORURE D'HYDROGENE OU DE L'ACIDE FLUORHYDRIQUE
The invention relates to a method for removing fluoride from a zinc-containing solution or suspension, in particular a zinc sulfate solution, to a defluoridated zinc sulfate solution obtained by such a method, to the use thereof, and to a method for producing zinc and hydrogen fluoride or hydrofluoric acid. The method for removing fluoride comprises (i) providing a zinc-containing solution or suspension A, wherein the zinc-containing solution or suspension A also contains fluoride ions； (ii) adding a solution B, which contains a dissolved salt of a rare earth element, to the zinc-containing solution or suspension A, wherein a solid material, which comprises a rare earth element fluoride, and a zinc-containing solution C are formed； and (iii) separating off the solid material from the zinc-containing solution C, wherein the zinc-containing solution C has a lower concentration of fluoride ions than the zinc-containing solution or suspension A.
