Transport numbers in the molten system NaF-KF-AlF3-Al2O3

被引：17
|
作者：
Hives, Jan [1 ]
Fellner, Pavel [1 ]
Thonstad, Jomar [2 ]
机构：
[1] Slovak Univ Technol Bratislava, SK-81237 Bratislava, Slovakia
[2] Norwegian Univ Sci & Technol, N-7034 Trondheim, Norway
来源：
IONICS | 2013年 / 19卷 / 02期
关键词：
Molten cryolite; Charge transport; Acid bath; BN cell; HITTORF METHOD; ALUMINUM; ELECTROLYSIS;
D O I：
10.1007/s11581-012-0736-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Transport numbers in the molten system NaF-KF-AlF3 (Al2O3, CaF2) were investigated by the Hittorf method. It was confirmed that in molten cryolite, Na3AlF6, 1,010 A degrees C, the current is transported almost exclusively by the Na+ cations (t(Na+) = 0.99). When AlF3 was added to a Na3AlF6 melt, the transport number of sodium cations decreased to 0.74 at the composition corresponding to NaAlF4. In molten K3AlF6, the transport number of K+ cations equals 0.836 at 1,005 A degrees C. In melts containing both Na+ and K+, the cations contribute to the charge transport approximately in the ratio of the squares of their ionic radii. When 5 mass % of CaF2 was added to the molten NaF-KF-AlF3 system, it remarkably influenced the transport numbers of potassium and fluoride anions.
引用
收藏
页码：315 / 319
页数：5
相关论文
共 50 条
  • [31] VISCOSITY OF NAF-ALF3-AL2O3 MELT MIXTURES
    TORKLEP, K
    OYE, HA
    ELECTROCHIMICA ACTA, 1980, 25 (02) : 229 - 235
  • [32] Cathode Process in the KF-AlF3-Al2O3 Melts
    Nikolaev, A. Yu
    Suzdaltsev, A., V
    Zaikov, Yu P.
    JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2019, 166 (15) : D784 - D791
  • [33] INTERFACIAL PHENOMENA IN THE REACTIONS OF AL AND AL-TI MELTS WITH KF-ALF3 AND NAF-ALF3 MELTS
    LEE, MS
    TERRY, BS
    GRIEVESON, P
    METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY, 1993, 24 (06): : 955 - 961
  • [34] THE DETERMINATION OF THE THERMODYNAMICS OF THE NAF-ALF3-AL2O3 SYSTEM WITH A SOLID ELECTROLYTE CELL
    BRISLEY, RJ
    FRAY, DJ
    METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY, 1984, 15 (01): : 135 - 139
  • [35] PHASE CONVERSIONS IN NAF-AL2O3 CROSS-SECTION OF 6NAF+AL2O3 REVERSIBLE 2ALF3+3NA2O SYSTEM
    PAVLIKOV, VN
    ARTEMOV, VA
    ZHURNAL NEORGANICHESKOI KHIMII, 1977, 22 (07): : 1943 - 1947
  • [36] Density of Na3AlF6-AlF3-LiF-MgF2-La2O3-Al2O3 Molten Salts System
    Jiao Y.
    Liao C.
    Wang X.
    Liu Q.
    Zhou R.
    Xiyou Jinshu/Chinese Journal of Rare Metals, 2019, 43 (05): : 532 - 540
  • [37] THE ACTIVITY OF LANTHANA IN NAF-ALF3-AL2O3-LA2O3 MELTS
    LIU, X
    SHEN, S
    JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1987, 134 (8B) : C513 - C513
  • [38] KF-NaF-AlF3 System: Liquidus Temperature and Phase Transition
    Yan, Hengwei
    Liu, Zhanwei
    Ma, Wenhui
    Huang, Liqiang
    Wang, Chengzhi
    Liu, Yingxin
    JOM, 2020, 72 (01) : 247 - 252
  • [39] KF-NaF-AlF3 System: Liquidus Temperature and Phase Transition
    Hengwei Yan
    Zhanwei Liu
    Wenhui Ma
    Liqiang Huang
    Chengzhi Wang
    Yingxin Liu
    JOM, 2020, 72 : 247 - 252
  • [40] Cathodic Processes in the KF-AlF3-Al2O3-B2O3 Melt
    Filatov, A. A.
    Suzdal'tsev, A., V
    Zaikov, Yu P.
    RUSSIAN METALLURGY, 2022, 2022 (08): : 837 - 843
12345