| Electrical conductivity of （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts |
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| 引用本文： | 黄有国,;赖延清,;田忠良,;李劼,;刘业翔,;李庆余.Electrical conductivity of （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts[J].中南工业大学学报(英文版),2008,15(6):819-823. |
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| 作者姓名： | 黄有国 ;赖延清 ;田忠良 ;李劼 ;刘业翔 ;李庆余 |
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| 作者单位： | [1]School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; [2]School of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, China |
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| 基金项目： | Project（2005CB623703） supported by the Major State Basic Research and Development Program of China; Project（2008AA030503） supported by the National High-Tech Research and Development Program of China; Project（GUIKEJI 0639032） supported by Applied Basic Research in Guangxi Province, China |
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| 摘 要： | The effects of contents of AlF3 and Al2O3, and temperature on electrical conductivity of （Na3AlF6-40%K3AlF6）- AlF3-Al2O3 were studied by continuously varying cell censtant （CVCC） technique. The results show that the conductivities of melts increase with the increase of temperature, but by different extents. Every increasing 10 ℃ results in an increase of 1.85 × 10^-2, 1.86× 10^-2, 1.89 × 10^-2 and 2.20 × 10^-2 S/cm in conductivity for the （Na3AlF6-40%K3AlF6）-AlF3 melts containing 0%, 20%, 24%, and 30% AlF3, respectively. An increase of every 10 ℃ in temperature results an increase about 1.89× 10^-2, 1.94 × 10^-2, 1.95 × 10^-2, 1.99× 10^-2 and 2.10× 10^-2 S/cm for （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts containing 0%, 1%, 2%, 3% and 4% Al2O3, respectively. The activation energy of conductance was calculated based on Arrhenius equation. Every increasing 1% of AlF3 results in a decrease of 0.019 and 0.020 S/cm in conductivity for （Na3AlF6-40%K3AlF6）-AlF3 melts at 900 and 1 000 ℃, respectively. Every increase of 1% Al2O3 results in a decrease of 0.07 S/cm in conductivity for （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts. The activation energy of conductance increases with the increase in content of AlF3 and Al2O3.
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| 关 键 词： | 铝电解 电导电性 活化能 添加剂 过热处理 |
Electrical conductivity of (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts |
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| You-guo Huang , Yan-qing Lai , Zhong-liang Tian , Jie Li , Ye-xiang Liu and Qing-yu Li.Electrical conductivity of (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts[J].Journal of Central South University of Technology,2008,15(6):819-823. |
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| Authors: | You-guo Huang Yan-qing Lai Zhong-liang Tian Jie Li Ye-xiang Liu and Qing-yu Li |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China;(2) School of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin, 541004, China |
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| Abstract: | The effects of contents of AlF3 and Al2O3, and temperature on electrical conductivity of (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 were studied by continuously varying cell constant (CVCC) technique. The results show that the conductivities of melts increase
with the increase of temperature, but by different extents. Every increasing 10 °C results in an increase of 1.85×10−2, 1.86×10−2, 1.89×10−2 and 2.20×10−2 S/cm in conductivity for the (Na3AlF6-40%K3AlF6)-AlF3 melts containing 0%, 20%, 24%, and 30% AlF3, respectively. An increase of every 10 °C in temperature results an increase about 1.89×10−2, 1.94×10−2, 1.95×10−2, 1.99×10−2 and 2.10×10−2 S/cm for (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts containing 0%, 1%, 2%, 3% and 4% Al2O3, respectively. The activation energy of conductance was calculated based on Arrhenius equation. Every increasing 1% of AlF3 results in a decrease of 0.019 and 0.020 S/cm in conductivity for (Na3AlF6-40%K3AlF6)-AlF3 melts at 900 and 1 000 °C, respectively. Every increase of 1% Al2O3 results in a decrease of 0.07 S/cm in conductivity for (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts. The activation energy of conductance increases with the increase in content of AlF3 and Al2O3.
Foundation item: Project(2005CB623703) supported by the Major State Basic Research and Development Program of China; Project(2008AA030503)
supported by the National High-Tech Research and Development Program of China; Project(GUIKEJI 0639032) supported by Applied
Basic Research in Guangxi Province, China |
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| Keywords: | aluminum electrolysis electrical conductivity activation energy additive superheat |
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