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Phase Analysis of the Binary System of Cryolite (Na3AlF6) and Sodium Metasilicate (Na2SiO3)

✍ Scribed by František Šimko; Miroslav Boča

Publisher: John Wiley and Sons
Year: 2007
Tongue: German
Weight: 103 KB
Volume: 90
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.200790160

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✦ Synopsis

The phase analysis of cryolite (Na 3 AlF 6 ) and sodium metasilicate (Na 2 SiO 3 ) was performed by thermal analysis. The eutectic system with a region of two immiscible substances at a concentration of Na 2 SiO 3 between 42.8 and 46.3 mol-% was identified and the eutectic temperature determined to (886 AE 2) 8C. Based on the results of mass-loss measurements, it was assumed that the introduced Na 2 SiO 3 reacts with Na 3 AlF 6 due to the formation of some nonvolatile stable compounds. The stable reaction products were identified by X-ray diffraction analysis and IR spectroscopy of the spontaneously cooled samples, which established the formation of NaF and stable amorphous aluminosilicate compounds.

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