Electrical conductivity of (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts
来源期刊：中南大学学报(英文版)2008年第6期
论文作者：黄有国 赖延清 田忠良 李劼 刘业翔 李庆余
文章页码：819 - 823
Key words：aluminum electrolysis; electrical conductivity; activation energy; additive; superheat
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 ℃ 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.
基金信息：the Major State Basic Research and Development Program of China
the National High-Tech Research and Development Program of China
by Applied Basic Research in Guangxi Province, China
