Methods of Making Urea Calcium Sulfate (UCS) Using High Shear Mixing

Abstract

A urea calcium sulfate (UCS) fertilizer granule includes urea, calcium sulfate, and a calcium sulfate urea adduct, and is prepared by a continuous process including: (a) combining urea, calcium sulfate, and water to form an aqueous slurry, wherein the urea is solubilized in the aqueous slurry; (b) mixing the aqueous slurry in a high shear mixing apparatus, wherein the high shear mixing apparatus applies a shear of at least 50,000/seconds to the aqueous slurry; and (c) removing at least a portion of the water from the aqueous slurry to form the UCS fertilizer granule. The UCS fertilizer granule includes at least 80% calcium sulfate urea adduct. Methods for making a fertilizer composition including urea calcium sulfate (UCS) fertilizer granules are also described.

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