Patent
Process for urea granulation
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TLDR
Urea granules are prepared by spraying an aqueous urea solution having a urea concentration of 70-99.9% by weight on to fluidized urea nuclei in the form of droplets having a mean drop diameter of 20-120 μm as discussed by the authors.Abstract:
Urea granules are prepared by spraying an aqueous urea solution having a urea concentration of 70-99.9% by weight on to fluidized urea nuclei in the form of droplets having a mean drop diameter of 20-120 μm at a temperature at which the water is evaporated from the solution sprayed on to the nuclei and urea crystallizes on the nuclei to form granules having a desired size.read more
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Process for the preparation of granules
TL;DR: In this article, the authors describe the preparation of granules by making nuclei grow, in a fluidized bed, by causing a liquid material to solidify thereon, with the aid of a spraying device provided with a central channel through which the liquid material is supplied, and a channel concentric therewith carrying a powerful gas stream.
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Johannes Hendrikus Maria Akkermans,Edwards Michael Frederick,Andreas Theodorus Johannes Groot,Cornelis Paulus Maria Montanus,Roland Wilhelmus Johannes Van Pomeren,Yuregir Korkut Ahmet Remzi +5 more
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Process for the production of urea granules
TL;DR: In this article, a process for the production of urea granules from a melt or solution of Urea by spraying the urea melts or solution, which also contains as granulation additive formaldehyde, methylolureum, urea-formaldehyde precondensates, or hexamethylenetetetramine, was described.
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A process for the production of polyurea encapsulated fertilizer particles and the encapsulated fertilizer particles produced by this process
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Encapsulation process for particles
David S. Alterman,Kil Whan Chun +1 more
TL;DR: In this article, a non-aqueous solution of a coating substance is sprayed from a nozzle downwardly on a fluidized bed of the particles to be coated, the nozzle height being adjusted so that the liquid droplets of coating material would just cover the cross-sectional area of the upper surface of the bed, if sprayed on the unexpanded bed.
Patent
Separation of products in granular form
Raymond Chauvin,Guillon Pierre +1 more
TL;DR: In this article, an apparatus for treating and separating granular products in granular form is described. But, the method is performed in a vertical portion of the bed, and the circulation currents arising therefrom are utilized for separating the treated product within the container itself, from the pulverulent solid, and vibrations are used for discharging the treated products to the outside.