SURFACE-TENSION AND DENSITY OF MOLTEN-SALTS BASED ON EQUIMOLAR NACL-KCL WITH ADDITION OF FLUORIDES

Molten salts based on equimolar (NaCl-KCl) with small addition of fluo rides are usually used in remelting secondary aluminum alloy scrap suc h as Used Beverage Cans. In this work, the surface tension of equimola r NaCl-KCl with addition of NaF, LiF, KF, and Na3AlF6 have been measur ed by the pin detachment method. Addition of fluorides into NaCl-KCl i ncreases the surface tensions of molten salts. The experimental result s are compared to the Guggenheim model as well as the modified Guggenh eim model. The binary modified Guggenheim model can give reasonable es timates for ternary salt systems. The density of these molten salts is also found to increase by the addition of fluorides. The implication of the surface tension and density data on ternary salt systems in rem elting process is discussed.