Effects of Porous Structures on Electrical Resistivity of Carbon Cathodes for Aluminum Reduction cells
Received:December 26, 2014  Revised:December 29, 2014
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KeyWord:carbon cathodes; porous structure; electrical resistivity; aluminum electrolysis
Zhu Jun 北京科技大学冶金与生态工程学院
Xue Jilai 北京科技大学冶金与生态工程学院
Chen Tong 北京科技大学冶金与生态工程学院
Li Xiang 北京科技大学冶金与生态工程学院
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      The effects of porous structures on resistivity of three industrial cathodes, i.e. semi-graphitic (HC35), full-graphitic (HC100) and graphitized (SMH), were investigated. The results show that HC35 is the highest in the aspect ratio and SMH is the biggest in the mean diameter, while both have similar values in pores size distribution. HC100 shows the least value in aspect ratio, mean diameter and pores size distribution. The variation in porous structure for the three cathodes may result in difference in their temperature dependence of resistivity (TDR). SMH has the lowest resistivity and the most stable TDR, while HC100 has middle resistivity but the lowest TDR. The relationship between ambient resistivity (ρ) and open porosity (ε) can be quantitatively described by the model of ρ=ρ0(1?ε)?4.63 for three typical carbon cathodes used in aluminum industry.