首页 | 本学科首页   官方微博 | 高级检索  
     


Phase Analysis of the Binary System of Cryolite (Na3AlF6) and Sodium Metasilicate (Na2SiO3)
Authors:František Šimko  Miroslav Boča
Affiliation:1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845?36 Bratislava, Slovak Republic, (phone: 00421‐2‐59410420;2. fax: 00421‐2‐59410444)
Abstract:The phase analysis of cryolite (Na3AlF6) and sodium metasilicate (Na2SiO3) was performed by thermal analysis. The eutectic system with a region of two immiscible substances at a concentration of Na2SiO3 between 42.8 and 46.3 mol‐% was identified and the eutectic temperature determined to (886±2) °C. Based on the results of mass‐loss measurements, it was assumed that the introduced Na2SiO3 reacts with Na3AlF6 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.
Keywords:Aluminium  Electrolysis  Cryolite  Thermal analysis  Sodium metasilicate  Silica  Phase equilibrium
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号