Phosphate-containing fertilizer derived from steepwater

Details Phosphate-containing fertilizer derived from steepwater Phosphate-containing fertilizer derived from steepwater

C - Chemistry, Metallurgy

05

F

C05F 5/00 (2006.01)

Patent

CA 2586639

This invention relates to fertilizer compositions containing phosphorus that is derived from steepwater, e.g., corn steepwater, and methods of making fertilizer from steepwater. In one implementation, steepwater is mixed with an alkaline metal hydroxide, which is added in an amount effective to precipitate at least about 75% of the phosphorus in the steepwater. A phosphorus-rich precipitate is separated from the steepwater; the precipitate includes an organic phosphorous component and an inorganic phosphorous component, which may include a phosphorous salt of the metal. At least a majority of the organic phosphorus component may be converted to inorganic phosphorous, improving its bioavailability to growing plants.

L'invention porte sur des engrais phosphorés dérivant d'eaux de trempage et en particulier d'eaux de trempage de maïs, et sur les procédés d'obtention desdits engrais. Dans une exécution, l'eau de trempage est mélangée à un hydroxyde de métal alcalin ajouté en quantité efficace pour faire précipiter au moins environ 75 % du phosphore de l'eau. On sépare ensuite de l'eau le précipité qui comporte un composant de phosphore organique et un composant de phosphore minéral lequel peut inclure un sel métallique phosphoreux. La majeure partie au moins du composant de phosphore organique peut être transformée en phosphore minéral, ce qui en améliore la biodisponibilité pour les plantes en cours de croissance.

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