Rosin-Rammler et al. believe that the particle size distribution of the pulverized product has two components, namely acceptable fine powder and unqualified coarse powder. According to this double formation analysis, it can be inferred that the destruction and pulverization of the particles are not caused by one type of damage, but are composed of two or more kinds of destruction effects.
a. Volume pulverization model - the entire particle is destroyed, and the pulverized product is mostly intermediate particles with large particle size. As the pulverization process progresses, these intermediate particles are gradually pulverized into fine powder components, and impact pulverization and extrusion pulverization are relatively close to this model.
b. Surface pulverization model - At a certain moment of pulverization, only the surface of the granules is destroyed, and the micropowder component is ground, and this destructive effect does not substantially involve the inside of the granule. This situation is typical of grinding and grinding.
a. Uniform comminution model—The force applied to the granules causes the particles to produce uniform dispersive damage and is directly pulverized into fine powder. The uniform comminution model only conforms to particle comminution where the structure is extremely tight.
The actual pulverization process is often the synthesis of the smashing models of the previous work types. The former constitutes an excessive component and the latter forms a stable component. The particle size distribution of the pulverized product obtained by volume pulverization and surface area pulverization is different. The particle size after volume pulverization is narrower and concentrated, but the proportion of fine particles is smaller. After surface pulverization, there are more fine particles, but the particle size distribution range is wider, that is, There are also more coarse particles.
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Specification
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