Abstract
Rare-earth mixtures have been eluted with ammonium HEDTA at 92° with substantial gains in the separation of ErHo, HoDy, DyTb and TbGd pairs. Individual stability constants at 92° have been derived from the observed separation factors, and a simple mechanism has been proposed to account for a drastic drop in chelate stability which occurs when only the lighter rare-earth chelate species are heated from 15° to 92°. A scheme for economical recovery of pure yttrium from yttrium-lanthanide mixtures is discussed.
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