ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Physical-chemical analysis of some systems important in production of aluminum. III. Liquidus of the cryolite angle of the system Na₃AlF₆-Al₂O₃-CaF₂-NaCl

K. Matiašovský and M. Malinovský

Slovak Academy of Sciences, Bratislava

Abstract: By thermal and visual analyses, the cryolite angle of the system Na₃AlF₆-Al₂O₃-CaF₂-NaCll (I) was studied. The liquidus of the system Na₃AlF₆-Al₂O₃ (II) was proven. This was a simple eutectic system composed of 15.7% Al₂O₃; the temp. of eutectic crystn. was 939°. The liquidus diagram of the cryolite angle of I was constructed. The addn. of NaCl decreased the temp. of primary crystn. by fusion of II in the area of primary crystn. of Na₃AlF₆. The effect of CaF₂ on decrease of temp. of primary crystn. was smaller than that of NaCl. The soly. of Al₂O₃ in fusion was decreased with increasing concn. of NaCl and CaF₂.

Full paper in Portable Document Format: 148a551.pdf (in Slovak)

Chemical Papers 14 (8) 551–563 (1960)