Process using rare earths to remove oxyanions from aqueous...

Details Process using rare earths to remove oxyanions from aqueous... Process using rare earths to remove oxyanions from aqueous...

C - Chemistry, Metallurgy

02

F

C02F 1/42 (2006.01) C02F 1/28 (2006.01)

Patent

CA 2618222

Oxyanions of various contaminant elements, such as chromium, antimony, molybdenum, tungsten, vanadium and uranium, are removed from water and other aqueous feeds by treating the feed with (1) a sorbent comprising one or more rare earth compounds, usually fixed or, supported on particulate solids having a cation exchange capacity less than 20 milliequivalents per 100 grams or (2) an aqueous solution of one or more soluble rare earth compounds.

La présente invention concerne un procédé d'élimination d'oxyanions de divers éléments contaminants, tels que le chrome, l'antimoine, le molybdène, le tungstène, le vanadium et l'uranium, à partie de l'eau et d'autres flux aqueux grâce au traitement du flux avec: (1) un sorbant comprenant un ou des composés de terres rares, généralement mélangés avec ou supportés sur des particules solides ayant une capacité d'échange cationique inférieure à 20 milliéquivalents par 100 grammes ou (2) une solution aqueuse d'un ou de plusieurs composés de terres rares solubles.

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