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Effect of TiB_2 content on resistance to sodium penetration of TiB_2/C cathode composites for aluminium electrolysis

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Journal of Central South University of Technology 2004年第4期11卷 400-404页

作者：李劼方静李庆余赖延清 School of Metallurgical Science and Engineering Central South UniversityChangsha 410083China Department of Chemistry Guangxi Normal UniversityGuilin 541004China

TiB2/C cathode composites with various contents of TiB2 were prepared and their characterizations were observed and compared. The expansion of samples due to sodium and bath penetration was tested with a modified laboratory Rapoport apparatus and the appearances of the cut sections of specimens after electrolysis were studied. The results show that the mass of TiB2/C cathode composites with mass fraction of TiB2 less than 70% appreciably increases, but that of the composites with mass fraction of TiB2 more than 70% decreases slightly after being baked. The resistance to sodium and bath penetration of TiB2/C cathode composites increases with the increase of TiB2 content, especially in the composites with high TiB2 content. TiB2/C cathode composites have high resistance to the penetration of sodium and bath as well as good wettability by molten aluminum, and keep integrality and have little change of appearance after electrolysis, which indicates that TiB2/C cathode composites can be used as inert wettable cathode for aluminum electrolysis.

关键词： aluminium electrolysis TiB_2 cathode composite material sodium penetration

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Simulation of thermal and sodium expansion stress in aluminum reduction cells

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Journal of Central South University of Technology 2008年第2期15卷 198-203页

作者：李劼伍玉云赖延清刘伟王志刚刘杰刘业翔 School of Metallurgical Science and Engineering Central South University

Two finite element(FE) models were built up for analysis of stress field in the lining of aluminum electrolysis *** of sodium concentration in cathode carbon blocks was calculated by one FE model of a cathode *** stress field was calculated by the other slice model of the cell at the end of the *** stresses coupling thermal and sodium expansion were considered after 30 d *** results indicate that sodium penetrates to the bottom of the cathode block after 30 d *** semi-graphitic carbon block has the largest stress at the thermal *** 30 d start-up the anthracitic carbon has the greatest sodium expansion stress and the graphitized carbon has the lowest sodium expansion *** penetration can cause larger deformation and stress in the cathode carbon block than thermal expansion.

关键词： aluminum reduction cell stress sodium penetration sodium expansion simulation

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