Patent ID: 8158006

Claim:
A method for removing fluorine from a zinc electrolytic solution containing fluorine, comprising: a) adsorbing in a slurry having a pH of from 3.0 to less than 7.0 the fluorine to a fluorine adsorbent/desorbent comprising at least one basic iron sulfate group iron compound; b) separating the slurry obtained in a) into a solid and a liquid; c) putting the solid separated in b) into an alkaline solution to desorb the fluorine from the fluorine adsorbent/desorbent; d) separating in a second solid/liquid separating step the solution obtained in c) into a solid and a liquid; and e) reusing the solid separated in the step d) or a solution after dissolving the solid in an acid solution having a pH of less than 2.0 in step a) as fluorine adsorbent/desorbent.