Liquidus Temperatures of Na3AlF6−AlF3−CaF2−NaCl−Al2O3 Melts

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• 作者：Bingliang Gao ; Shixing Wang ; An Ji ; Xianwei Hu ; Zhongning Shi ; Zhaowen Wang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：November 11, 2010
• 年：2010
• 卷：55
• 期：11
• 页码：5214-5215
• 全文大小：78K
• 年卷期：v.55,no.11(November 11, 2010)
• ISSN：1520-5134

文摘

Temperatures for the primary crystallization of Na₃AlF₆ in multicomponent electrolyte systems of interest for the aluminum electrolysis process were determined by thermal analysis. The molar ratio of NaF/AlF₃ ranged from 2.0 to 3.0. The melts contained up to 9 % NaCl (by mass). An empirical equation describing liquidus temperatures for the primary crystallization of Na₃AlF₆ was derived: t/°C = 978.142 − 4.078w(AlF₃) −13.341w(NaCl) + 0.619w(AlF₃)² + 1.210w(NaCl)² + 1.052w(AlF₃)w(NaCl) − 0.034w(AlF₃)³ − 0.050w(NaCl)³ − 0.040w(AlF₃)w(NaCl)² − 0.070w(AlF₃)²w(NaCl), where w(AlF₃) denotes the mass fraction of excess aluminum fluoride with respect to cryolite and w(NaCl) denotes the mass fraction of sodium chloride.