| Determination of ohmic/voltage drop and factors influencing anodic overvoltage of carbon anodes in Na_3AlF_6-Al_2O_3 based melts |
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| 作者姓名： | 李庆余 李劼 田忠良 张刚 |
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| 作者单位： | School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering，School of Metallurgical Science and Engineering Central South University，Changsha 410083，China，Chemistry Department，Guangxi Normal University，Guilin 5410043，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China |
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| 基金项目： | Project(G19990 64 90 3 )supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChina |
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| 摘 要： | 1 INTRODUCTIONAlthoughtheanodicprocessandmeasurementofanodicovervoltageincryolite aluminameltshavebeenthesubjectsofnumerousinvestigations ,problemssuchasthereactionmechanismandtherate deter miningstepoftheanodereactionarestillcontrover sialandneedclarification .Theexperimentalinforma tionischaracterisedbymajordivergenceregardingthemagnitudeandthetypeofanodicovervoltage ,whichismostlikelycausedbythefollowingfac tors16 ] :1)Theanodicovervoltagediffersamongtheva rietyofcarbonmaterials,sucha…
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Determination of ohmic/voltage drop and factors influencing anodic overvoltage of carbon anodes in Na3AlF6-Al2O3 based melts |
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| LI Qing yu ,LI Jie ,TIAN Zhong liang ,ZHANG Gang.Determination of ohmic/voltage drop and factors influencing anodic overvoltage of carbon anodes in Na_3AlF_6-Al_2O_3 based melts[J].Transactions of Nonferrous Metals Society of China,2003,13(3). |
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| Authors: | LI Qing yu LI Jie TIAN Zhong liang ZHANG Gang |
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| Affiliation: | LI Qing yu 1,2,LI Jie 1,TIAN Zhong liang 1,ZHANG Gang 1 |
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| Abstract: | Experimental technique has been inadequate to anodic overvoltage measurements in aluminum electrolysis. To determine its ohmic/voltage drop precisely, a current interruption technique was modified with a high frequency digital oscilloscope, current interrupters with fast switching time, an improved cell configuration and a simulation applied to the oscillating potential decay curve. The results show that the technique can give good reproducibility for overvoltage studies. A substantial increase of anodic overvoltage is observed with graphite powder addition, metallic aluminum addition and CO bubbling in the melts. |
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| Keywords: | ohmic/voltage drop anodic overvoltage aluminum electrolysis |
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