Method and dedicated device for lithium hexafluorophosphate synthesis tail gas treatment

The invention discloses a method and dedicated device for lithium hexafluorophosphate synthesis tail gas treatment. Tail gas is pressurized through a booster fan and then sent to a condenser, condensate is recycled to an anhydrous hydrogen fluoride reception tank, mixed gas discharged from the condenser passes through an airtight first-stage agitation reactor, a horizontal auger delivery reactor and a second-stage agitation reactor in sequence in the material stirring and guiding direction, a trace of HF in the mixed gas reacts with LiCl powder added into an agitation reaction combined device in advance, and LiCl powder in the second-stage agitation reactor returns into the first-stage agitation reactor through a material balance pipe to be forced to be stirred and circulated inside an agitation reaction system; tail gas discharged from the second-stage agitation reactor enters a water scrubber to generate hydrochloric acid after passing through a dust remover for gas trapping so that a small amount of powder can be taken away, and gas discharged from the water scrubber passes through an alkaline tower for alkaline washing and then is discharged. By the adoption of the method and dedicated device, HF in the mixed tail gas can be effectively removed, the quality of by-product hydrochloric acid is improved, and the application field is broadened.