Investigating wettability of cryolitic melts on carbon/graphite cathode materials in cooperation with image analysis
Wetting and penetration of cryolitic melts into carbon cathodes during aluminum electrolysis is an important factor for cathode deterioration. This work is aimed to develop a better digital method for characterization of the porous structure and the cryolite wettability on C/G cathode materials for aluminum electrolysis. The wettings by sodium or potassium cryolite melts at 700-960 ℃ were determined using a modified sessile drop method, which were presented in correlation with image analysis on the internal porosity, pore size distribution, pore shape and direction, pore connectivity, and so on. The results indicated that the wetting process was porous structure and materials dependent, where pores distribution was the strong interaction and potassium cryolite wetted the cathode surface very well. Full graphitic and graphitized cathode samples had similar wetting due to their homologous porous structure and materials, while semi-graphitic cathode sample was different entirely. The profiles of penetrated cryolite across the wetted interface into the cathode samples after wetting were detected using SEM-EDS analysis. It was found that the pores number, specific surface area and graphite content of cathode materials contributed the most to cryolite penetration into the carbon cathodes.
image analysis wetting porous structure C/G cathode materials
ZHU Jun XUE Jilai GAO Yuanling LI Jigang ZHANG Yanan
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Be School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Be
国际会议
The 3rd Asian Conference on Molten Salts and Ions Liquids 2011(第三届亚洲熔盐与离子液体会议)
哈尔滨
英文
19-23
2011-01-06（万方平台首次上网日期，不代表论文的发表时间）