Urea Granulation: The Hidden Driver of NPK Granule Formation
What is the role of urea in NPK granulation? Urea plays a triple role in the granulation process of NPK compound fertilizer: nitrogen nutrient carrier, liquid-phase binder, and granulation solubilizer. Its unique physicochemical properties—high nitrogen content (46.2%), easy hygroscopic solubility, and low melting point (132.7 degrees Celsius)—make it the most active component in the drum granulation process. Understanding the mechanism of urea's action is key to controlling granulation rate and granule quality.
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