Treatment method and treatment system for ammoniated pelleting compound fertilizer tail gas

The invention discloses a treatment method and a treatment system for ammoniated pelleting compound fertilizer tail gas. The tail gas treatment method provided by the invention comprises the following steps of: simultaneously adding phosphoric acid and tail gas in a drying working section to a venturi tube; using phosphoric acid to wash ammonia in the tail gas; emptying the tail gas, and punching washing liquid into a pelleting working section, so as to react with pelleting tail gas in a pelleting working section venturi tube; performing secondary water washing due to high ammonia content in the pelleting tail gas; emptying the tail gas after ammonia content of the tail gas is qualified; and punching the washing liquid into a potassium hydride process to reuse. The tail gas treatment system provided by the invention comprises a drying tail gas working section and a pelleting tail gas working section. Ammonia discharge amount of the tail gas is reduced to be 20 kg per hour from 50-60 kg per hour, thereby being