Kaolin derivatives

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 33/46 (2006.01) B01J 21/16 (2006.01) B01J 39/14 (2006.01) C01B 33/40 (2006.01)

Patent

CA 2165321

Amorphous derivatives of kaolin group minerals, characterised by high specific surfaces and/or high ration exchange capacities and a 27 Al MAS NMR spectrum having a dominant peak at ~55 ppm relative to Al(H2O)6 3+. Such derivatives are prepared by reacting a kaolin group mineral with a reagent such as an alkali metal halide or an ammonium halide which converts the majority of the octahedrally co-ordinated aluminium in the kaolin group mineral to tetrahedrally co- ordinated aluminium. Such derivatives show high selectivity in its ration exchange towards the metals: Pb2+, Cu2+, Cd2+, Ni2+, CO2+, Cr3+, Sr2+, Zn2+, Nd3+ and UO2 2+.

L'invention concerne des dérivés amorphes des minéraux du groupe kaolin, caractérisés par des surfaces spécifiques élevées et/ou des capacités élevées d'échange cationique et un spectre <27>Al MAS NMR comportant une pointe dominante à < SIMILAR >55ppm par rapport à Al(H2O)6<3+>. On a préparé ces dérivés en faisant réagir un minéral du groupe kaolin avec un réactif tel qu'un halogénure de métal alcalin ou un halogénure d'ammonium qui convertit la plus grande partie de l'aluminium à coordonnées octaédriques du minéral du groupe kaolin en aluminum à coordonnées tétraédriques. De tels dérivés présentent une sélectivité élevée dans leur échange cationique envers les métaux: Pb<2+>, Cu<2+>, Cd<2+>, Ni<2+>, CO<2+>, Cr<3+>, Sr<2+>, Zn<2+>, Nd<3+> et UO2<2+>.

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