1. ZARS Project Terry Ring
Solids Handling
ZARS Project
Terry Ring

2. Particle Segregation

3. 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.

4. Particle Size

5. Counting Particles

6. Histogram Representation Particle Size Distribution

7. Cumulative Distribution Representation of PSD

8. Errors in PSD
2.0
Expected Error in %
1.0

9. Errors in PSD

10. Blending Powders

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

12. Cyclone

13. Sieve & Filter Classification
Cyclone Classification

14. 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??

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

16. Sedimentation
Laminar Flow

17. Sedimentation

18. Dust Sedimentation/Diffusion Equilibrium
Wind velocity prevents settling