Abstract
The rate of reductive extraction of actinide and lanthanide elements was measured in the two-phase system of molten LiF-BeF 2 salt and liquid bismuth at 823–973 K. The effect of temperature, salt composition and reductant concentration was studied. In most cases, it was observed that the solid bismuthides of these elements were formed at the salt-bismuth interface following the addition of reductant. The extraction rate was limited by their solubility in bismuth. The mass transfer coefficient of each element was evaluated by applying a film theory. On the basis of the obtained results, some considerations are made for the development of extraction systems.
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