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

Physicochemical analysis of some systems important in the production of aluminum. V. Liquidus of the cryolite angle of the system Na₃AlF₆-AlF₃-Al₂O₃-NaCl

K. Matiašovský and M. Malinovský

Slovak Academy of Sciences, Bratislava

Abstract: cf. CA 55, 23263b.-By thermal analysis and by a visual method the cryolite angle of the system Na₃AlF₆AlF₃-Al₂O₃-NaCl (I) was studied to det. the effect of the addn. of NaCl on the temp. of the primary crystn. and on the soly. of Al₂O₃ in fusions of the system Na₃AlF₆-AlF₃-Al₂O₃. Liquidus diagrams of 4 cuts of I at cryolite ratios 2.75, 2.50, 2.25, and 2.00 were constructed. They are analogous to those of the system Na₃AlF₆-Al₂O₃-NaCl. AlF₃ decreases the temp. of primary crystn. and the soly. of AlO₃ in cryolite fusions, in agreement with data in the literature. The addn. of NaCl decreases the temp. of primary crystn. by approx. 90°. The decrease produced by NaCl of the soly. of Al₂O₃ in the fusion depends on the cryolite ratio and decreases relatively with increasing AlF₃ concn.

Full paper in Portable Document Format: 154a241.pdf (in Slovak)

Chemical Papers 15 (4) 241–256 (1961)