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

Liquidus of the cryolyte corner of the Na₃AlF₆-Al₂O₃-Na₂SO₄ system

K. Matiašovský and M. Malinovský

Slovak Academy of Sciences, Bratislava 9

Abstract: The effect of Na₂SO₄ on the temp. of the primary crystn. of the system Na₃AlF₆-Al₂O₃ and on the soly. of Al₂O₃ in the cryolite was studied. A phase diagram of the system Na₃AlF₆-Na₂SO₄ and the liquidus of the cryolite corner of the system Na₃AlF₆.-Al₂O₃-Na₂SO₄ were constructed. It was detd. by thermal and x-ray phase analyses that at the temp. of the eutectic, crystn. is the boundary of the existence of the solid soln. 80% Na₂SO₄. In the phase diagram, a large area of solid solns. of Na₂SO₄ in the cryolyte and on the side of Na₂SO₄, a pure Na₂SO₄ was detd. Na₂SO₄ decreases the temp. of the primary crystn. in the cryolite and considerably decreases the soly. of Al₂O₃ in the melt.

Full paper in Portable Document Format: 191a41.pdf (in Slovak)

Chemical Papers 19 (1) 41–45 (1965)