Citrate soluble slow release iron humate

C - Chemistry – Metallurgy – 05 – F

Patent

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C05F 11/02 (2006.01) C05B 7/00 (2006.01) C05B 21/00 (2006.01) C05D 9/02 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2177853

A new slow releasing particulate iron humate agricultural nutrient composition exhibiting substantially complete solubility of its iron content in soil solutions as indicated by neutral citrate solubilities, and almost no solubility in water, and a new method for preparing the composition. The method comprises admixing and coreacting iron humate with about equimolar amounts of a divalent metal oxide, an aqueous hydroxide of a monovalent Lewis acid, and a water soluble inorganic phosphate. The iron humate amounts to between 20 and 70 percent of the nutrient particles, and the reaction is carried out at temperatures between 60 and 150 °C for between 4 and 25 minutes.

Nouvelle composition nutritive particulaire d'humate de fer à libération lente et à usage agricole. Sensiblement tout le fer présent dans cette composition est soluble dans les solutions du sol, ceci étant indiqué par sa solubilité dans les solutions neutres de citrate, et il est quasiment insoluble dans l'eau. On a également prévu un nouveau procédé de préparation de cette composition, consistant à ajouter l'humate de fer à des quantités à peu près équimoléculaires d'un oxyde métallique bivalent, d'un hydroxyde aqueux d'un acide de Lewis monovalent, et d'un phosphate inorganique hydrosoluble, et à le faire réagir avec ces composants. L'humate de fer représente de 20 à 70 % des particules nutritives, et la réaction s'effectue à des températures comprises entre 60 et 150 ~C pendant 4 à 25 minutes.

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