The Measurement of the Granularity of Solid Powder by Method of Disc Centrifuging-Sedimentation

The sizes and granularity distributions of several solid powders were determined by disc centrifuging-sedimentation, and the influences of particles shape, extinction coefficient and dispersity of powder were also reported in this paper. The results shown that under given condition the model LKY-1 eriometer has good repeatability of the granulometry, especially suitable for measuring the distribution of fine particles. The 4% gallic acid is the best dispersing agent, for 0.5% concentrition graphite or MoS2 powder. Although the optical density is related to the absorbance factor, so far as the black-grey powder sample, because of its optical effect is very weak the absorbance factor can be regarded as a constant to neglect its influence.