ZARS Project Terry Ring Solids Handling ZARS Project Terry Ring

Particle Segregation

Golden Rules of Sampling To get a representative sample for analysis Chemical analysis Particle size distribution analysis Rule 1 A powder should be sampled when in motion Rule 2 The whole stream of powder should be taken for many short increments of time in preference to part of the stream being taken for the whole time.

Particle Size

Counting Particles

Histogram Representation Particle Size Distribution

Cumulative Distribution Representation of PSD

Errors in PSD 2.0 Expected Error in % 1.0

Errors in PSD

Blending Powders

Classification Powder is separated into two streams Equipment Fine Particles Coarse Particles Equipment Sieves Cyclones Centrifuge Filter Venturi Scruber Electrostatic Precipitator

Cyclone

Sieve & Filter Classification Cyclone Classification

How to Blend Powders V- Blender A in one arm, B in other arm After 1/2 Turnover A/2 & B/2 in center After 1 Turns A/2 & B/2 in each arm Is it well mixed??

Segregation Particle size distributions should be matched to prevent segregation in a pile of powders

Sedimentation Laminar Flow

Sedimentation

Dust Sedimentation/Diffusion Equilibrium Wind velocity prevents settling