Fertiliser

Details Fertiliser Fertiliser

C - Chemistry, Metallurgy

05

B

C05B 11/00 (2006.01) C05B 17/00 (2006.01)

Patent

CA 2506496

The present invention relates to fertiliser composition comprising from 95% to 1% by weight, based on the total weight of the fertiliser composition, of a phosphate fertiliser and from 5% to 99% by weight, based on the total weight of the fertiliser composition, of a phosphate binding substance selected from the group consisting of red mud that has been at least partially reacted with a material comprising at least one of calcium ions and magnesium ions, red mud that has been at least partially neutralised by addition of acid, red mud that has been at least partially neutralised by treatment with carbon dioxide, and red mud that has been at least partially neutralised by addition of at least one mineral containing at least one of calcium ions and magnesium ions, the phosphate binding substance having a reaction pH, when mixed with 5 times its weight of water, of less than 10.5. There are further provided methods for preparing the fertiliser and methods for fertilising soils.

L'invention concerne une composition d'engrais comprenant entre 95 % et 1 % en poids, en fonction du poids total de ladite composition d'engrais, d'un engrais phosphaté; et entre 5 % et 99 % en poids, en fonction du poids total de ladite composition d'engrais, d'une substance de liaison des phosphates sélectionnée dans le groupe comprenant: de la boue rouge ayant partiellement réagi avec un matériau comprenant au moins des ions calcium ou des ions magnésium, de la boue rouge partiellement neutralisée par ajout d'acide, de la boue rouge partiellement neutralisée par traitement avec du dioxyde de carbone, et de la boue rouge partiellement neutralisée par ajout d'au moins un minerai contenant au moins des ions calcium ou des ions magnésium. La substance de liaison des phosphates présente un pH de réaction, lorsqu'elle est mélangée à 5 fois son poids en eau, inférieur à 10,5. L'invention concerne en outre des procédés de préparation dudit engrais ainsi que des procédés de fertilisation des sols.

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