New PDF release: A Course in Inorganic Preparations

By Henderson W. E.

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The hopper is filled at the top and it should be noted that, if there is an appreciable size distribution of the particles, some segregation may occur during filling with the larger particles tending to roll to the outside of the piles in the hopper. Discharge from the hopper takes place through an aperture at the bottom of the cone, and difficulties are commonly experienced in obtaining a regular, or sometimes any, flow. 15 taken from the work of WEIGAND(15) . Bridging of particles may take place and sometimes stable arches (b) may form inside the hopper and, although these can usually be broken down by vibrators attached to the walls, problems of persistent blockage are not unknown.

Sedimentation analyses must be carried out at concentrations which are sufficiently low for interactive effects between particles to be negligible so that their terminal falling velocities can be taken as equal to those of isolated particles. 1 deg K) is necessary to suppress convection currents. The lower limit of particle size is set by the increasing importance of Brownian motion for progressively smaller particles. 05 µm. The elutriation method is really a reverse sedimentation process in which the particles are dispersed in an upward flowing stream of fluid.

The lower limit of particle size is set by the increasing importance of Brownian motion for progressively smaller particles. 05 µm. The elutriation method is really a reverse sedimentation process in which the particles are dispersed in an upward flowing stream of fluid. All particles with terminal falling velocities less than the upward velocity of the fluid will be carried away. A complete size analysis can be obtained by using successively higher fluid velocities. 4 shows the standard elutriator (BS 893)(6) for particles with settling velocities between 7 and 70 mm/s.

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A Course in Inorganic Preparations by Henderson W. E.


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