Accession Number : AD0603382

Title :   Solute Distribution in the Na20-B203-NaC1 System. II. Alkaline Earths and Rare Earths.

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Rowell,M. H.

Report Date : 17 JUN 1964

Pagination or Media Count : 27

Abstract : Radioactive tracers were used to determine the distribution of micro quantities of Ba, Sr, Nd, and Eu between the two conjugate liquid phases throughout the immiscibility region in the system Na2O-B2O3-NaCl at 830C. Phase diagram data and borate/salt distribution coefficients of the solutes were obtained. The distribution coefficients of these cations increase according to their field strengths, in agreement with the previously proposed ion-exchange mechanism for solute distribution. Distribution coefficients are extremely sensitive to phase compositions, and increase with increasing Na2O content, until maxima are reached in the region where the borate network structure begins to break down. Large separation factors exist between the alkali metal, alkaline earth, and rare earth groups. Appreciable intragroup separation factors are also found, the Ba-Sr and Eu-Nd separation factors being about 2.7 and 1.9 respectively. Phase diagram and solute distribution data are correlated with known polyborate structures. (Author)

Descriptors :   (*ION EXCHANGE, PHASE STUDIES), (*ALKALINE EARTH METALS, ION EXCHANGE), (*RARE EARTH ELEMENTS, ION EXCHANGE), LIQUID METALS, SODIUM COMPOUNDS, BORON COMPOUNDS, OXIDES, CHLORIDES, BARIUM, STRONTIUM, NEODYMIUM, EUROPIUM, DISTRIBUTION, SOLUTIONS(MIXTURES), SEPARATION, BORATES, MOLECULAR STRUCTURE, CHEMICAL EQUILIBRIUM, SOLVENT EXTRACTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE