Binder composition and method for treating particulate material

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 17/28 (2006.01) C09K 17/40 (2006.01) C09K 17/48 (2006.01)

Patent

CA 2473167

In accordance with this invention a binder composition for treating particulate material to form a solid aggregate matrix is prepared by providing a urea formaldehyde precondensate; a polar solvent; additional urea; an acid or salt thereof, the acid or salt thereof being selected such as to render the pH of the binder composition to a value from 2.0 to 5.3; providing a sugar; providing a binding promoter for enhancing the binding between the binder composition and the particulate material; and mixing the above so as to form a binder composition. The binder composition is mixed with particulate material and allowed to set into a solid aggregate matrix over a period of longer than 30 minutes from being mixed with the said particulate material.

L'invention concerne une composition de liaison permettant de traiter une matière particulaire pour former une matrice d'agrégat solide. Cette composition est préparée selon un procédé consistant à mettre à disposition un précondensat d'urée-formaldéhyde; un solvant polaire ; de l'urée supplémentaire ; de l'acide ou du sel de ceux-ci ; l'acide ou le sel étant sélectionné de sorte à rendre le pH de la composition de liaison équivalent à une valeur comprise entre 2,0 et 5,3 ; à mettre à disposition un sucre, à mettre à disposition un promoteur de liaison permettant d'améliorer la liaison entre la composition de liaison et la matière particulaire ; et à mélanger ces derniers de sorte à former une composition de liaison. Cette composition de liaison est mélangée à la matière particulaire et on laisse reposer jusqu'à formation d'une matrice d'agrégat solide pendant une période supérieure à 30 minutes à compter à partir du mélange avec la matière particulaire.

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