Rare earth phosphate colloidal dispersion and preparation...

B - Operations – Transporting – 01 – J

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B01J 13/00 (2006.01) C09K 11/81 (2006.01)

Patent

CA 2431262

The invention concerns a rare earth colloidal dispersion and its preparation method. The dispersion is characterised in that it comprises anisotropic and disaggregated particle, or capable of being disaggregated, of at least a rare earth and a water-soluble monovalent acid anion having a pKa of at least 2.5. It is prepared by a method which consists in: mixing a solution of at least a rare earth salt with phosphate ions controlling the pH of the reaction medium at a value ranging between 4 and 9 and in the presence of a water-soluble monovalent acid having a pH of at least 2.5; optionally ripening the resulting mixture; separating the precipitate from the reaction medium: re-dispersing in water said precipitate.

L'invention concerne une dispersion colloïdale de phosphate de terre rare et son procédé de préparation.La dispersion est caractérisée en ce qu'elle comprend des particules anisotropes et désagglomérées ou désagglomérables de phosphate d'au moins une terre rare et un anion d'un acide monovalent, soluble dans l'eau et présentant un pKa d'au moins 2,5. Elle est préparée par un procédé dans lequel on mélange une solution d'un sel d'au moins une terre rare avec des ions phosphates en contrôlant le pH du milieu de réaction à une valeur comprise entre 4 et 9 et en présence d'un acide monovalent, soluble dans l'eau et présentant un pKa d'au moins 2,5; on procède éventuellement à un mûrissement du mélange ainsi obtenu; on sépare le précipité du milieu de réaction; on remet en dispersion dans l'eau ledit précipité.

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