Rotary drum fertilizer production line, in which steam, gas ammonia or phosphoric acid or nitrogen solution, phosphoric ammonia slurry, heavy calcium slurry are added to the machine to complete the chemical reaction and heat supply compound fertilizer granulation process; or The cold granulation process of compound fertilizer supplemented with a small amount of water. The material to be granulated is passed through the rotation of the barrel, and the barrel rotates when there is no material. Under the appropriate humidity and temperature, the ball will be aggregated to complete the ball makin
