The Battle to Protect Granule Hardness: Five Mechanical Culprits Behind Insufficient NPK Strength
When the compressive strength of NPK fertilizer granules is below 15N, the breakage rate during transportation exceeds 12%, and the uniformity of application decreases. Insufficient granule strength is not caused by a single factor, but rather by a synergistic imbalance of five mechanical factors: liquid phase content, roller pressure parameters, raw material fineness, drying curve, and cooling rate. By controlling the granulation liquid phase at 8%-12%, increasing the roller pressure to 20-22MPa, and stabilizing the raw material fineness at 60-80 mesh, the granule strength can be increased from 10N to over 25N.
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