The Impact of Screen Aperture on Fertilizer Uniformity: How to Achieve a 95% Granulation Rate and Prevent Particle Separation with a 3.5-5.5mm Screen Tolerance
In short: Screen aperture directly determines the particle size distribution of fertilizer granules, thus affecting the uniformity of spreading, particle separation during transportation, and particle hardness during storage. Using a double-layer screening system, with an upper screen aperture of 5.5mm and a lower screen aperture of 3.5mm, ensures that the final product particle size conforms to the 2-4.75mm range specified in GB/T 20781-2006 compound fertilizer standard, thereby achieving a granulation rate of ≥90%. Fine particles smaller than 1mm generate excessive dust, forming crystal bridges and agglomerates through capillary moisture absorption. Furthermore, due to their different ballistic characteristics when leaving the spreading disc, they lead to uneven nutrient distribution during spreading.
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