Granulation of raw materials for fertiliser blending

Target and tolerances

Verbal notation Physical dimension (1) Target Tolerance
Mean particle size d50 (in mm) 3.25 mm +/- 0.25 mm
Fine particles < 1 mm 0% 0.25%
Course particles > 5 mm 0% 1.00%
Main range 2,5 – 4,00 mm 90% +/+ 5%
Granulometrics spread index (2) GSI : ((d84-d16) x 100) / (2 x d50) <18

(1) It is assume that the sieve analysis occurs according to CEN, European standard EN 1235/AI

EFBA recommends to use these 7 sieves (5, 4, 3.55,3.15, 2.80, 2.50 and 1 mm)

(2) Former notation as “average size ranger variation”.

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