The invention discloses a method for recovering elemental
iodine from perfluoroalkyl
iodide, which comprises the following steps: (1) mixing perfluoroalkyl
iodide and an alkaline solution to form a reaction solution, and heating and stirring to form a deiodinated solution; (2) adjusting the pH value of the deiodinated solution to 6-7 by using an acidic solution, and distilling to obtain an inorganic iodized salt
solid; and (3) adding water to dissolve the inorganic iodized salt
solid to obtain an inorganic iodized
salt solution, adding an acidic solution to maintain the pH value to be strongly acidic, adding an
oxidizing agent to carry out an oxidation-reduction reaction, filtering and separating to obtain wet
iodine, and
drying and dehydrating to obtain the
iodine simple substance. The method is used for treating perfluoroiodo
alkane which is high in iodine content and difficult to treat, an alkaline solution is adopted for reacting with perfluoroiodo
alkane for deiodination, the deiodination solution is subjected to acidification and oxidation reaction to prepare high-purity iodine simple substance, and the iodine simple substance can be directly used as a product to be applied to production of iodine-containing compounds.