About granulation

The so-called granulation process is actually the process of enlarging the particle size. That is, when a certain amount of masterbatch is input on the rotating rotor and air is blown, due to the centrifugal force and friction, a vortex gyratory particle flow is formed on the curved surface of the stator and rotor. Then, spray atomized slurry on its surface and remove powder, the particles will roll bigger and rounder, and become spherical particles with high true sphericity.

Obviously, the purpose of the rotor rotation is to form a vortex particle flow to make the particles roll and stir evenly; spraying slurry is to vortex wet the particle surface and increase viscosity; powder supply is to enlarge the particles and prevent the particles from sticking into agglomerates; jetting is to atomize the slurry and improve the uniformity of wetting; blowing is to prevent powder or small particles from falling into the ventilation cavity from the annular gap on the outer edge of the rotor and properly dry the particle flow.

Therefore, the granulation quality depends on the rotor speed n and the spraying flow q. , powder supply rate q, jet flow rate qP', blast volume qE, and blast temperature tE. However, for a granulation process, the rotor speed, blast volume and its temperature and jet volume can remain unchanged or change less to obtain a better granulation effect. Therefore, these four parameters can be selected approximately based on experience. However, the spray flow rate qJ and the powder supply rate q must be adjusted frequently with the increase of particle size and maintain the appropriate ratio between them to produce better pellets. Therefore, they have become two key parameters affecting the granulation quality.

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