Process for the removal of iodide - and / or silicate anions from salt solutions by anion exchange for the electrolysis on zirconium hydroxide

摘要

PROBLEM TO BE SOLVED: To efficiently remove iodine and silica ions which are contained in saline water containing impurity ions and affect an electrolytic treatment by subjecting the saline water and zirconium hydroxide to a contact treatment under acidity. ;SOLUTION: Saline water containing iodine and the silica ions and a zirconium hydroxide are subjected to a contact treatment under acidity, by which the iodine and/or the silica ions are adsorbed away. The zirconium hydroxide adsorbing the iodine and the silica ions and the aqueous solution are brought into contact at a pH value higher than the pH value in an adsorption stage, by which the adsorbed iodine and the silica ions are desorbed. The adsorption and the desorption are preferably respectively continuously carried out with the single treating vessel or are respectively continuously carried out with separate treating vessels to circulate the zirconium hydroxide between the respective stages. Further, the pretreatment to convert the neutral silica and/or colloidal silica contained in the saline water is preferably executed.;COPYRIGHT: (C)2000,JPO