Apparatus and process for coating particles

C - Chemistry – Metallurgy – 05 – G

Patent

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C05G 5/00 (2006.01) B01J 2/16 (2006.01) B01J 8/26 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2120618

An apparatus and method for continuously producing polymer coated particles, and in particular, a polymer coated fertilizer, wherein the coating material used is, for example, an aqueous film forming latex. The coating process is conducted with a plurality of fluidized beds, connected in series, under conditions such that, preferably, the relative humidity of the air in the initial coating zones is maintained below the critical relative humidity of the particle to be coated. The apparatus and process provides a method to prepare coated particles having a narrow coating weight distribution, and thus allows for the economical production of a slow release fertilizer.

Appareil et procédé servant à produire de façon continue des particules enrobées de polymère, en particulier un engrais enrobé de polymère, le matériau d'enrobage utilisé se composant, par exemple, d'un latex filmogène aqueux. Le procédé d'enrobage est effectué dans une multiplicité de lits fluidisés connectés en série, dans des conditions telles que l'humidité relative de l'air dans les zones d'enrobage initiales est de préférence maintenue à un niveau inférieur à l'humidité critique relative de la particule devant être enrobée. L'appareil et le procédé permettent de préparer des particules enrobées présentant une répartition du poids d'enrobage comprise dans une plage étroite, ce qui permet de produire économiquement un engrais à libération lente.

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