Equipment and process for recovery of fluorine from flue gas of hydration absorption of phosphorus in kiln-method phosphoric acid technology

The invention discloses equipment and a process for recovery of fluorine from flue gas of hydration absorption of phosphorus in kiln-method phosphoric acid technology; the equipment comprises a first-stage fluorine absorption tower and a second-stage fluorine absorption tower which are fluidization countercurrent washing towers, and the first-stage fluorine absorption tower is mainly composed of a fluosilicic acid washing pipe and a fluorosilicic acid separation tank. The top of the separation tank is provided with a flue gas outlet, a fluosilicic acid liquid outlet at the bottom is communicated with the fluorosilicic acid washing pipe by a cycle conveying pipeline; the main structure of the second-stage fluorine absorption tower is similar to the first-stage fluorine absorption tower, the top of a second-stage fluorosilicic acid separation tank is provided with a defoaming layer and a flue gas outlet, and a fluosilicic acid liquid outlet at the bottom is communicated with a nozzle in a second-stage fluorosil