Separation of rare earths by means of porous glass media

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Abstract

Dissolved rare earth elements can be separated from each other by passing their solutions through columns loaded with porous silica glasses doped with Group IV additives, in particular, zirconium, and pre-treated with basic reagents such as 2-aminoethanol or NaNO3/NH4OH. The process appears to involve basicity separation, i.e. separation based on differences in the redissolution pH of various rare earths, with the basic reagent attached to a solid support. The best supports are found to be those which lose all or most of their negative surface charge as the pH is lowered to the range where rare earth hydroxides begin to redissolve.

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    Presented at the ACS Symposium on Ion Exchange Fundamentals and Applications, Dallas, TX, April 9–14, 1989.

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    Present address: Patent and Trademark Office, Washington, DC 20231 U.S.A.

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