Calcium nitrate and potassium nitrate fertiliser particles
AssigneeYara International Asa
InventorsAmund Myrstad, Petr Chladek, Torstein Obrestad
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Abstract
The present disclosure concerns fertilizer particles comprising calcium nitrate and potassium nitrate. It is found that fertilizer particles comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate can be produced by melt granulation. Due to undercooling problems, such particles were not expected to be suitable for industrial production by melt granulation. However, the present disclosure provides a composition which forms a low viscosity melt with short solidification time. This was successfully achieved by reducing the water content of a fertilizer melt comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate to less than 3% w/w of the melt.
Claims11
A fertilizer comprising 43 to 47% w/w calcium nitrate as if present in anhydrous form, 46 to 54% w/w potassium nitrate and 0.5 to 3% w/w of water, wherein the fertilizer is in the form of solid homogeneous particles.
A fertilizer melt comprising 43 to 47% w/w calcium nitrate, 46 to 54% w/w potassium nitrate, 2 to 5% w/w ammonium nitrate, and less than 3% w/w water.
Dependencies are inferred from the claim text.