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

Thermal analysis of (NaF/AlF₃)-FeF₃ and (NaF/AlF₃)-FeO systems

František Šimko

Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia

E-mail: uachsim@savba.sk

Abstract: Thermal analysis of the two systems, (NaF/AlF₃)-FeF₃ and (NaF/AlF₃)-FeO, was carried out with three different cryolite ratios. In these systems, “impurity compounds” decreased the temperature of primary crystallisation with decreasing cryolite ratios. From the slope of the dependencies, it can be assumed that the excess of AlF₃ plays a more significant role in changes in the “Fe(III)” systems than in “Fe(II)” systems.

Keywords: aluminium electrolysis – impurity – acid electrolyte – FeF3 – FeO – thermal analysis

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-011-0114-2

Chemical Papers 66 (3) 235–238 (2012)