Both rotary drum granulators and roller extrusion granulators have their own advantages in fertilizer production, and they have significant differences in multiple dimensions. In terms of working principle, the rotary drum granulator uses a rotating drum to lift up the material internally. Under the action of centrifugal force, friction force, and gravity, the material circulates and the binder is sprayed to form the particles. The counter roll extrusion granulator uses a pair of rotating rollers to squeeze the material into the concave mold on the surface of the rollers, without the need for adhesive (which can be added in some cases). In terms of particle characteristics, the shape of the particles produced by the rotary drum granulator is relatively regular, mostly approximately spherical or elliptical, and the surface of the particles is relatively smooth. Due to the sufficient rolling of the material inside the drum, the internal structure of the pa...
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