Device for concentrating back-extracted dilute acid and removing organic solvent in wet-process purified phosphoric acid production

The utility model discloses a device for concentrating reverse extraction dilute acid and removing an organic solvent in wet-process purification phosphoric acid production. The device comprises a tower body, a main circulating pump, a graphite heater, a reverse extraction dilute acid feeding pump and a return acid pump, a wire mesh demister and a detachable and washable plate type demister are fixed in the tower body; a waste steam discharge port is formed in the elliptical head at the upper part of the tower body; the side walls of the tower body at the upper part of the wire mesh demister and the upper part of the plate type demister are respectively provided with a pure water flushing port; a reverse extraction dilute acid inlet and a return acid inlet are formed in the tower body below the plate type demister; an inlet of the main circulating pump is communicated with a main circulating acid outlet at the bottom of the tower body through a pipeline, an outlet of the main circulating pump is connected to