Concurrent with or following the homogenization phase, a calibrated granulation is carried out in the same mixers with very high yield in the required range. This operation takes place with the introduction of water or a mainly acidic suspension. The optimal granulation usually varies between 1 and 5 mm.
Using the granulation disk, their results proved that the highest grade of the material granulation was obtained with the rotational speed of 14 rpm, while our results were acquired by 20 rpm. Table 4 shows, that the toughness of granules of coal fly ash was on average 2.92 N, and was higher than made from lignite ash (1.46 N), in contrast to• Coating of pellets is easier than coating granules due to their spherical shape and low surface area to volume ratio. • Pelletization gives better results in formulation of sustained release and controlled release delivery Figure 7. Method of pelletization system than granulation. mlza.