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Particle size distribution (Granulometry)

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The study was carried out with two replicates, using a sieving methodology. Samples (10.010 g for replicate 1 and 10.012 g for replicate 2) of the test item were transferred to a sieve system (after removal of fine powder), where the particles encountered a series of 4 sieves with decreasing mesh sizes. The mesh sizes of the sieves were 18, 35, 60, 140 mesh and container. After shaking for 20 minutes, the particles retained in each of the sieves were collected, and weighed. These data were used to determine the granulometric distribution of the substance, expressed as a particle size distribution by mass.

 

Particle size Distribution

 

% of particles by           mass

Size of particles

(mm)

0.01

> 1.00

0.02

1.00 – 0.500

0.02

0.500 – 0.250

0.02

0.250 – 0.106

99.87

< 0.106

 

The quantity of fine powder (< 0.053 mm) removed from the sample before final sieving was equivalent to 96%.