Method for making nitrogenous and complex fertilizers in highly homogenized spherical granule form starting from urea formaldehyde liquid resins and the fertilizer made thereby
OwnerGiancarlo Costa, Giuseppe Rizziinventors
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Abstract
The present invention relates to a method for making nitrogenous and complex fertilizers, in granule form, suitable for slowly releasing nitrogen, comprising the steps of preparing an aqueous urea/formaldehyde dispersion with a molar ratio from 0.8:1 to 2:1, adding an aqueous catalyzer solution in a weight ratio from 0.1 to 4%, controlling the pH of the aqueous dispersion to hold it within a range from 4.0 to 7.0, and supplying the aqueous dispersion to a recirculating granulating device, as a growth seed.
Claims33
A method for making a nitrogenous and complex fertilizer, for slowly releasing nitrogen, in granule form, wherein said method comprises the steps of preparing an aqueous urea-formaldehyde dispersion with a molar urea/formaldehyde ratio from 0.8:1 to 2:1, adding to said dispersion an aqueous catalyzer solution in a weight ratio from 0.1 to 4%, controlling a pH of said dispersion to hold said pH within a range from 4.0 to 7.0, and supplying said dispersion to a granulating device, said granulating device including recycling means for recycling a granulated product as a growth seed.
Dependencies are inferred from the claim text.