Factors Affecting The Bulk Density Of Powder

       

There are
many factors affecting the bulk density of powder, such as powder particle
shape, size, surface roughness and particle size distribution. Generally, these
factors are obviously different due to the different preparation methods and
process conditions of powder.

Generally
speaking, the bulk density of powder decreases with the decrease of particle
size, the increase of particle non spherical coefficient and the increase of
surface roughness. The effect of particle size composition on the bulk density
of powder is not single value, which is often determined by the effects of
particle filling voids and bridging. If the latter is dominant, the loose
density of the powder will be reduced; If the former is dominant, the loose density
of the powder is increased. In order to obtain the required loose density of
powder, in addition to the above factors, it is also feasible to classify and
batch reasonably.

In addition
to the density of raw materials, the bulk density of powder is largely related
to the shape, particle size and particle size distribution, surface state of
powder particles and so on. The bulk density of irregular powder is smaller
than that of regular powder; The more irregular the shape of the powder, the
lower the loose density. One of the reasons is that the more irregular the
powder, the greater its specific surface and the greater the friction between
particles, so the loose density is lower; Similarly, the smaller the powder
particle, the larger its specific surface, so the smaller the loose density of
the finer powder.

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