Recovery method for tail gas washing water of ammonium sulfate granulating device

The invention discloses a recovery method for tail gas washing water of an ammonium sulfate granulating device. The recovery method is characterized by comprising the following steps of: (1) pumping the tail gas washing water which is up to a certain concentration and density after the washing into a pipe filter through a circulating pump, wherein the washing water amount is 50m /h; (2) returning the clear liquid from of the pipe filter to a system to circularly wash and entering the filtered slurry into a centrifugal machine; and (3) outwards conveying dry filter cakes from the centrifugal machine to a compound fertilizer device to recover, and returning filtrate to the pipe filter to filter again. The method disclosed by the invention has the advantages that the recycling efficiency of sewage is increased, the amount of clean water supplied by the system is greatly reduced, the zero discharge of the sewage is realized and the purposes of energy saving and emission reduction are achieved at the same time; in