Method and special device for treating lithium hexafluorophosphate synthetic tail gas with simple process flow

The invention discloses a method and a special device for treating lithium hexafluorophosphate synthetic tail gas with a simple process flow. The tail gas is pressurized by a booster fan and then sentto a condenser, a condensate is recovered to an anhydrous hydrogen fluoride receiving tank, the mixed gas out of the condenser sequentially passes through a closed first-stage stirring reactor, a horizontal spiral conveying reactor and a second-stage stirring reactor in a material stirring diversion direction, trace HF in the mixed gas reacts with LiCl powder pre-added in a stirring reaction combination device, and the LiCl powder in the second-stage stirring reactor is returned to the first-stage stirring reactor through a material balance pipe; the tail gas out of the second-stage stirringreactor is collected by a dust collector to take away a small amount of powder and then enters a water washing tower to prepare hydrochloric acid, and the gas out of the water washing tower is discharged after alkali washing by an alkali washing tower. The method and the special device provided by the invention effectively remove HF in the mixed tail gas, improve the quality of a by-product namelyhydrochloric acid and broaden the application field.