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Reactions of sulphides in molten cryolite |
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| Authors: | P. Fellner, M. Korenko, M. Ambrov , V. Danielik,J. Thonstad |
| Affiliation: | a Department of Inorganic Technology, Slovak University of Technology, Radlinského 9, SK-812 37, Bratislava, Slovakia b Department of Materials Technology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway |
| Abstract: | The freezing point depression of cryolite (Na3AlF6) by the addition of Al2S3 and FeS was investigated. It was found that for contents of up to 10 wt.% Al2S3, it brings into the melt three new species. X-ray analysis of solidified melts of the system Na3AlF6–Al2S3 showed that it contained chiolite, Na5Al3F14 and Na2S. Chiolite originates from a reaction between Na3AlF6 and AlF3. This suggests that the system Na3AlF6–Al2S3 is a part of the reciprocal system NaF, AlF3//Na2S, Al2S3. The solubility of FeS in cryolite melt is so low that it cannot be determined by the thermal analysis. When FeO is added to the Na3AlF6–Al2S3 melt, Fe2+ cations and S2− anions react under the formation of solid FeS. A similar reaction was observed for Ni2+ and S2− ions. |
| Keywords: | Cryolite Aluminium sulphide Cryoscopy |
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