MICRO-RAMAN SPECTRA RESEARCH ON NaF-AlF_3-NaCl MELTS

摘要

Raman spectra of NaF-AlF_3-NaCl melts with the compositions in aluminum electrolysis practice are recorded by using the ultraviolet laser source. A kind of sealed sample cell was used to improve the measuring precision. The ionic structure of the melts with different cryolite ratio (molar ratio between NaF and AlF_3) and NaCl contents was studied. The effect of the composition and temperature was analyzed. The results show that with the addition of the NaCl to the acidic NaF-AlF_3 melts, the relative contents of the Al-F entities have been changed greatly. It is thought that the relative contents of the complex ions are also greatly influenced by the temperature.