Filtration heating device used in technology for extracting iodine from wet-process phosphoric acid

The utility model discloses a filtration heating device used in a technology for extracting iodine from wet-process phosphoric acid. The filtration heating device is characterized in that a cover plate (2) is arranged on the top of a filter tank (1), a hole is formed in the cover plate (2), and the size of the hole is matched with a heat emitting surface of an air heater (4); in addition, a small hole is formed in the cover plate (2) and is used for installing a glass tube thermometer (3) with the measurement range of 0-100 DEG C, and the glass tube thermometer (3) is used for monitoring the air temperature in a filter box (1). According to the filtration heating device, hot air is added to the filter box, so that water in an iodine and water mixture is rapidly dried, evaporated and separated, thus the effect of increasing the mass fraction of the iodine in crude iodine products is achieved.