Abstract
The purpose of comminution is the disintegration of solids and the forming of the largest possible and most active surface area by supplying mechanical energy. The development of fineness is determined by two counteracting processes, one being the increase of free surface accompanied by particle size reduction, the other being the decrease of free surface accompanied by particle size increase. Among the processes accompanying particle size increase, two stages can be distinguished: first, aggregation, i.e., the weak, reversible adhesion of particle due to van der Waals forces, occurring during grinding for short times, and second, in the case of grinding for long times, a very compact, irreversible adhesion (crystallization, welding) of the particles due to chemical forces larger by several orders of magnitude; i.e. agglomeration. While aggregation primarily influences the progress and effectiveness of the grinding process, agglomeration has a deterious effect on certain properties of the grinding product.
Published Version
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