B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/14, 209/2
B07B 4/00 (2006.01) B07B 4/04 (2006.01)
Patent
CA 1125705
ABSTRACT OF THE DISCLOSURE Mica flakes are separated from other particulate material and classified according to their aspect ratios (i.e. ratio of average diameter to thickness), by a combination of screening and dropping a mass of mica flakes optionally mixed with other particles into an air stream flowing in a direction making a substantial angle with the vertical, and having a high degree of uniformity and low turbulence, so that the particles and flakes assume trajectories determined by their terminal velocities. The distance downstream travelled by a flake or particle is proportional to its terminal velocity, which in turn is inversely proportional to the product of diameter and thickness of the flake, and to the density of the particle or flake. Receptacles are provided at different downstream distances from the location of introduction of the material, below the flowing air stream, into which particles and flakes of different terminal velo- cities are collected. Previously or subsequently, the flakes are screened to separate them on the basis of diameter, to give a final separation according to aspect ratio.
322291
Governing Council Of The University Of Toronto (the)
Stewart & Kolash Ltd
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