A process for the preparation of compound fertilizer granules

C - Chemistry – Metallurgy – 05 – G

Patent

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Details

C05G 5/00 (2006.01) B01J 2/00 (2006.01) C05B 19/00 (2006.01) C05C 3/00 (2006.01) C05C 9/00 (2006.01) C05D 1/02 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2336352

The invention relates to a process for the preparation of compound fertilizer granules containing at least two of the plant nutrients nitrogen, phosphorus and potassium, said process comprising the steps of: providing a solid feed material comprising at least one solid fertilizer raw material and optionally recycle material, feeding the feed material or a part thereof into a melter for melting a desired portion thereof and keeping said portion in molten state, feeding the molten or partly molten material and optionally other desired solid raw materials to a granulator to obtain a granulated product, and cooling and optionally screening the granulated product to obtain dry compound fertilizer granules having a desired size distribution, provided that no water or aqueous liquid is introduced into the process.

L'invention concerne un procédé de préparation de granules d'engrais composé contenant au moins deux des éléments nutritifs pour plantes suivants: azote, phosphore et potassium. Ce procédé comprend les opération suivantes: on prend un matériau de charge solide comprenant au moins une matière première d'engrais solide et éventuellement un matériau de recyclage, on introduit ce matériau de charge ou une partie de ce dernier dans un four à fusion pour en faire fondre une portion sélectionnée et on maintient cette portion à l'état fondu, puis on introduit le matériau fondu ou partiellement fondu et éventuellement d'autres matières premières désirées dans un granulateur pour obtenir un produit granulé et on refroidit et on tamise éventuellement le produit granulé pour obtenir des granules d'engrais composé sec présentant la composition granulométrique désirée, ce procédé se déroulant sans adjonction d'eau ou de liquide aqueux.

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