Rotary drum granulator is a molding machine that can make material to a specific shape. The rotary drum granulator is one of the key equipment in the compound fertilizer industry. It is suitable for mass production of cold, hot granulation and high-medium-low concentration compound fertilizer. The main operation way is wet type granulation: Through a certain amount of water or steam, the base fertilizer is fully reacted in chemical way after being wet in the drum; them under certain liquid conditions, the rotating motion of the drum is used to make the material particles get squeezed together into balls.