Method for producing iodine component-containing aqueous solution using inorganic flocculant with selective removal property of fluoride ion and phosphate ion

A method for producing an iodine component-containing aqueous solution, comprising:

• a flocculation step of bringing an inorganic flocculant that selectively reacts with fluoride ions and/or phosphate ions more than with iodide ions into contact with untreated water containing iodide ions and fluoride ions and/or phosphate ions, to obtain an aggregate formed by a reaction between the fluoride ions and/or the phosphate ions and the inorganic flocculant;
• and
• a separation step of removing the aggregate from the untreated water to leave the iodide ions in the untreated water, to obtain treated water,
• wherein the inorganic flocculant includes one or two or more selected from the group consisting of a cerium-based flocculant, a zirconium-based flocculant, an aluminum-based flocculant, a calcium-based flocculant, and an iron-based flocculant.