The extraction of plutonium from molten uranium with immiscible molten metals, silver, lanthanum and cerium, has been investigated. A facility is described in which these experiments on uranium containing 0. 2% plutonium were conducted safely. The distribution coefficients and efficiency of removal from uranium were determined for silver and lanthanum at several temperatures in the range 1175-1375° C and for cerium at 1225o C.
Voigt, A. F.; Clark, R. G.; Gonser, J. G.; Haes, D. L.; Lutz, G. J.; and Malaby, K. L., "Removal of plutonium from uranium by molten metal extraction" (1962). Ames Laboratory Technical Reports. 49.