Urea passivation technique and new product passivated urea, to make urea or urea-based compound universally blendable
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United States of America Patent
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Nov 8, 2016
Grant Date -
Jul 30, 2015
app pub date -
Aug 28, 2013
filing date -
Aug 29, 2012
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Abstract
The invention concerns a method of producing passivated urea or urea based compounds for fertilizer blends wherein the urea particles are treated with a mineral acid that reacts with urea and creates a grasping layer. Thereafter a solid base in powder form is added in excess to the particles to coat the acidified particle surface. The invention also concerns a fertilizer blend comprising the passivated urea or urea based compounds with one or more of AN or AN-based compound, NS products, superphosphates, and more generally with a priori most compounds that urea is susceptible to react with when in direct contact. A safe blend comprises more than 40 weight % of the passivated urea.
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