Method for separating metals such as zirconium and hafnium

Details Method for separating metals such as zirconium and hafnium Method for separating metals such as zirconium and hafnium

2006-06-20

2006-06-20

Walker, W. L. (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S651000, C210S735000, C210S634000, C210S682000, C210S684000, C210S688000, C210S639000, C210S644000, C210S912000, C423S021500, C423S009000, C423S021100, C423S008000, C423S010000

Reexamination Certificate

active

07063792

ABSTRACT:
A method for separating a metal (a) from a metal (2), preferably zirconium from hafnium, which consists in dissolving said metals in an aqueous solution wherein said metals are in a state preventing them from passing through a nanofiltration membrane; treating the aqueous medium with a ligand, for example EDTA, which is complexed with metal (1) and/or metal (2), then in passing the resulting treated medium on a filtering membrane allowing through the ligand-metal complexes, but retaining the metals not complexed with the ligand.

REFERENCES:
patent: 5766478 (1998-06-01), Smith et al.
patent: 5961833 (1999-10-01), Green et al.
patent: 2 794 032 (2000-12-01), None
patent: 6323711 (1988-03-01), None
Database Accession No. 131:220264 XP002168087 “Separation of gadolinium and lanthanum by nanofiltration-complexation in aqueous medium”*.

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