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

Physicochemical analyses of some systems important in aluminum production. VII. Liquidus of the cryolite angle in the cut of the system Na₃AlF₆AlF₃-Al₂O₃-CaF₂-NaCl-MgF₂ with the constant mount of 3 percent CaF₂

K. Matiašovský and M. Malinovský

Slovak Technical University, Bratislava

Abstract: cf. CA 56, 60a. By thermal analysis and visual methods, the cryolite angle in the cut of the system Na₃AlF₆AlF₃-Al₂O₃-CaF₂-NaCl-MgF₂  was studied. The effect of the addn. of NaCl in combination with the addn. of MgF₂ and AlF₃ on the temp. decrease of the primary crystn. of cryolite fusions and on the soly. of Al₂O₃ in the fusion was detd. The effect of the addn. of NaCl on the electrolyte fusion is approx. the same as that of MgF₂ (5°/1% of the addn.). Less effective is the addn. of AlF₃ (2-3°/1% AlF₃). The effect of these addns. on the decrease of the iso-thermal soly. of Al₂O₃ increases in the order NaCl < AlF₃ < MgF₂ (0.15-0.20% Al₂O₃/1% NaCl, 0.2 0.3% Al₂O₃/1% AlF₃, 0.25-0.50% Al₂O₃/1% MgF₂).

Full paper in Portable Document Format: 1510a699.pdf (in Slovak)

Chemical Papers 15 (10) 699–712 (1961)