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I n t h e metal t r a n s f e r process f o r removal of rare-ear th f i s s i o n products from t h e f u e l sa l t of a molten-salt breeder r eac to r (MSBR),the rare e a r t h s are ex t rac ted from the molten f u e l sa l t i n t o a molten bismuth so lu t ion containing l i th ium and thorium m e t a l reductants , t ransfer red from the bismuth i n t o molten l i th ium chlor ide and, f i n a l l y , recovered from the l i th ium chlor ide by ex t r ac t ion i n t o molten bismuth containing l i th ium reductant. Engineering experiments using mechanically ag i t a t ed , nond ispers ing contactors with sa l t and bismuth flow rates [Q 1% of those required f o r processing t h e f u e l sa l t from a 1000-MW(e) MSBR] have been conducted (1) t o study t h i s process, (2) t o measure the removal rate of a representa t ive rare-ear th f i s s i o n product (neodymium) from MSBR f u e l sa l t , and (3) t o evaluate t h e mechanically ag i t a t ed contactor f o r use i n a p l an t processing f u e l s a l t from a 1000-MW(e) FISBR. The experimental equipment and procedures are described. Resul ts obtained during f i v e experiments i n which the rare e a r t h neodymium w a s ex t rac ted from MSBR f u e l sa l t are presented. Removal rates and mass-transfer coe f f i c i en t s between the sa l t and bismuth phases were determined f o r neodymium and are discussed i n terms of t h e processing requirements f o r a 1000-MW(e) MSBR.

Engineering tests of the metal transfer process for extraction of rare-earth fission products from a molten-salt breeder reactor fuel salt