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A Cell Condition-Sensitive Frequency Segmentation Method Based on the Sub-Band Instantaneous Energy Spectrum of aluminum electrolysis Cell Voltage

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Engineering 2021年第9期7卷 1282-1292页

作者： Zhaohui Zeng Weihua Gui Xiaofang Chen Yongfang Xie Hongliang Zhang Yubo Sun School of Automation Central South UniversityChangsha 410083China Key Laboratory of Intelligent Computing&Information Processing Ministry of EducationXiangtan UniversityXiangtan 411105China School of Metallurgy and Environment Central South UniversityChangsha 410083China

Cell voltage is a widely used signal that can be measured online from an industrial aluminum electrolysis cell.A variety of parameters for the analysis and control of industrial cells are calculated using the cell voltage.In this paper,the frequency segmentation of cell voltage is used as the basis for designing filters to obtain these parameters.Based on the qualitative analysis of the cell voltage,the sub-band instantaneous energy spectrum(SIEP)is first proposed,which is then used to quantitatively represent the characteristics of the designated frequency bands of the cell voltage under various cell conditions.Ultimately,a cell condition-sensitive frequency segmentation method is given.The proposed frequency segmentation method divides the effective frequency band into the[0,0.001]Hz band of lowfrequency signals and the[0.001,0.050]Hz band of low-frequency noise,and subdivides the lowfrequency noise into the[0.001,0.010]Hz band of metal pad abnormal rolling and the[0.01,0.05]Hz band of sub-low-frequency noise.Compared with the instantaneous energy spectrum based on empirical mode decomposition,the SIEP more finely represents the law of energy change with time in any designated frequency band within the effective frequency band of the cell voltage.The proposed frequency segmentation method is more sensitive to cell condition changes and can obtain more elaborate details of online cell condition information,thus providing a more reliable and accurate online basis for cell condition monitoring and control decisions.

关键词： Sub-band instantaneous energy spectrum Cell condition-sensitive frequency band Frequency segmentation Metal pad abnormal rolling aluminum electrolysis

EFFECT OF Cu-Ni CONTENT ON THE CORROSION RESISTANCE OF(Cu-Ni)/(10NiO-90NiFe204)CERMET INERT ANODE FOR aluminum electrolysis

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Acta Metallurgica Sinica(English Letters) 2008年第1期21卷 72-78页

作者： Z.L. Tian Y.Q. Lai J. Li Y.X. Liu School of Metallurgical Science and Engineering Central South University Changsha 410083 China

（Cu-Ni）/（10NiO-90NiFe204） cermet inert anodes containing metal Cu-Ni0, 5, 10, 15 and 20 wt pct were prepared and their corrosion resistance to Na3AlF6-Al2O3 melts was investigated. The results indicate that the content of metal Cu-Ni has little effect on the steady-state concentration of Ni in the electrolyte and the values could not be used to effectively differentiate their corrosion resistance. The steady-state concentration of Fe decreases from 304×10^-6 to 168×10^-6 and that of Cu increases from 21×10^-6 to 71×10^-6 with the content of metal Cu-Ni increasing from 0 to 20 wt pct. Post-examination shows that metallic phase Cu-Ni is corroded preferentially during electrolysis and many pores are left at the anode surface. Considering the corrosion resistance and electrical conductivity, the cermet containing metal Cu-Ni 5 wt pct should be selected and studied further.

关键词： aluminum electrolysis Inert anode NiFe2O4 based cermet Corrosion resistance

EFFECT OF STRUCTURAL PARAMETERS ON THE THERMAL STRESS OF A NiFe_(2)O_(4)-BASED CERMET INERT ANODE IN aluminum electrolysis

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Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 139-147页

作者： J. Li Z.G. Wang Y.Q. Lai Y.Y. Wu S.L. Ye School of Metallurgy Science and Engineering Central South University Changsha 410083 China

Inert anode has been a hot issue in the aluminum industry for many decades. With the help of FEA （finite element analysis） software ANSYS, a model was developed to simulate the thermal stress distribution working condition of an inert anode. To reduce its thermal stress, the effect of some parameters on the thermal stress distribution was investigated, including the anode height, the anode radius, the hole depth, the hole radius, and the radius of inner chamfer and outer chamfer. The results showed that in the actual working condition of an inert anode, there existed a large axial tensile stress near the tangent interface between the anode and bath, which was the major cause of anode breaking. Increasing the anode height and reducing the hole depth properly seemed to be beneficial for the stress distribution. With the increase of anode radius, the stress distribution became better first and then deteriorated, the reasonable value was between 0.045 to 0.06m. The hole radius had a significant effect on the stress and a smaller radius would reduce the thermal stress. The effect of the radius of the inner chamfer and the outer chamfer was less than other parameters.

关键词： inert anode thermal stress structural parameter aluminum electrolysis

Electrical Conductivity and Corrosion Resistanceof ZnFe _(2)O _(4) Based Materials Used as Inert Anodefor aluminum electrolysis

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Advances in Manufacturing 1999年第3期3卷 251-254页

作者： YU Xian-jin ZHANG Guang-li QIU Zhu-xian ZHAO Min-shou SU Qiang Changchun Institute of Applied Chemistry Chinese Academy of Science Northeast University

ZnFe 2O 4 and ZnFe 2O 4 based materials were tested to obtain the electrical conductivity and corrosion resistance in melting bath for aluminum electrolysis. The results proved that adequate additives, such as Ni 2O 3 CuO, Cu, ZnO and CeO 2 would increase the electrical conductivity, and the ZnFe 2O 4 based anodes with these additives were of good corrosion resistance. The current density on anode, the mole ratio of NaF/AlF 3 (MR) and the content of alumina in the bath effect the anode corrosion rate in different way.

关键词： aluminum electrolysis ZnFe _(2)O _(4) based materials inert anode for aluminum electrolysis

Research on Co-Cu-Al alloy inert anode for aluminum electrolysis in potassium cryolite low temperature electrolyte system

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Research on Co-Cu-Al alloy inert anode for aluminum electrol...

Research on Decision Support System of aluminum electrolysis Process Based on Data Warehouse

The 3rd Asian Conference on Molten Salts and Ions Liquids

作者：丁海洋卢世刚杨娟玉张向军阚素荣 R＆D Centre for Vehicle Battery and Energy Storage General Research Institute for Non-Ferrous Metals

The ternary Co-Cu-Al alloy was employed as inert anode for aluminum electrolysis in potassium cryolite system.The aluminum product purity was 99.4 wt.%.Co existed in the Co-Cu-Al matrix in the form of metal compound CoAl,thus restraining the diffusion of molten salt.The corrosion rate for the Co-Cu-Al anode was 14.38 mm/a,only 67.8%of that for the Cu-Al anode.

关键词： inert anode alloys anodes corrosion aluminum electrolysis potassium cryolite rare earths

来源： cnki会议评论

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Research on Decision Support System of Aluminum Electrolysis...

Effect of Yb_2O_3 doping on the grain boundary of NiFe_2O_4–10NiO-based cermets after sintering

2010 Chinese Control and Decision Conference

作者： CAO Danyang~1,YANG Bingru~2,LI Jinhong~1,ZENG Shuiping~1 1.College of Information Engineering,North China University of Technology,Beijing 100144 2.College of Information Engineering,Beijing University of Science and Technology,Beijing 100083

＜正＞The aluminum electrolysis process is nonlinear and multivariable.By studying the decision support system,a decision support system of aluminum electrolysis process based on Web is built.This article describes the key technologies of the system including system architecture,data warehouse model,OLAP,human-computer interaction based on Web,and the research on aluminum electrolytic process parameters.This system converts the aluminum electrolytic production data to knowledge and improves enterprise decision-making ability and production efficiency.

关键词： Decision Support System Data Warehouse aluminum electrolysis OLAP

来源： cnki会议评论

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International Journal of Minerals,Metallurgy and Materials 2015年第12期22卷 1334-1341页

作者： Han-bing He School of Metallurgy and Environment Central South University Department of Metallurgical Engineering University of Utah

xYb2O3-15（20Ni-Cu）/（85 -x）（NiFe2O4-10NiO）（x = 0, 0.25, 0.5, 0.75, 1.0, 2.0, and 10.0） cermets for aluminum electrolysis were prepared to investigate the effect ofYb2O3 doping on the grain boundary of the cermets after sintering. The results showed that each interface was very clear and that with increasing Yb2O3 content, most of the Yb was evenly distributed at the grain boundary. Moreover, according to the phase composition and microstructural analysis by X-ray diffraction （XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy （SEM/EDX）, and electron probe microanalysis （EPMA）, YbFeO3 was produced along the grain boundary. The YbFeO3 was concluded to not only have formed from the interaction between the NiFe2O4 or Fe2O3 component and Yb2O3 at the grain boundary of the cermets, but also from the decomposition of NiFe2O4 into NiO and Fe2O3 and the subsequent reaction of Fe2O3 with Yb2O3. Thus, the production of YbFeO3 resulted in a cermet with high relative density, good electrical conductivity, and good corrosion resistance.

关键词： cermets ytterbium oxide doping grain boundaries aluminum electrolysis

Electrolytic properties and element migration in Ni-TiB_(2)/Al_(2)O_(3)composite cathode

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Rare Metals 2021年第1期40卷 57-64页

作者： Yu-Dong Liang Li-Jun Wang Deng-Peng Chai Sheng-Zhong Bao Ting-Ting Niu Jun-Wei Wang Ying Liu Rare Metals and Metallurgy Materials Research Institute General Research Institute for Nonferrous MetalsBeijing 100088China Zhengzhou Nonferrous Metals Research Institute Co. LtdChaleoZhengzhou 450041China

With alumina sol as binder and Ni metal as sintering aids,the Ni-TiB_(2)/Al_(2)O_(3) composite cathode material for aluminum electrolysis was prepared by coldpressed sintering.The mechanical properties of the composite cathode material were measured.Its electrolytic properties were identified by a 20-A electrolysis test.Cathode samples before and after electrolysis test were measured by energy-dispersive spectroscopy(EDS).The migration behavior of various elements in the electrolysis process was studied by phase analysis.The result shows that Ni metal can effectively fill the gap between the aggregate during the sintering process,which can improve the sintering density of the composite cathode material significantly.The voltage of the 20-A electrolysis test is stable.The impurity of aluminum liquid is 0.42%.The aluminum liquid can wet the cathode surface effectively,and the Ni-TiB_(2)/Al_(2)O_(3) composite is an ideal wettable cathode material.In the process of electrolysis,the alkali elements in the electrolyte penetrate the electrode,where K goes deeper than Na.Al generated on the cathode surface will also penetrate the cathode through the gap of the composite material,while Ni in the electrode will spread into the aluminum liquid layer.

关键词： aluminum electrolysis TiB_(2) Alumina sol Cold-pressed sintering Infiltration

Electrocatalysis of carbon anode in aluminium electrolysis

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Rare Metals 2002年第2期21卷 117-122页

作者： LAIYanqing LIUYexiang YANGJianhong THONSTADJomar Dept.MetallurgicalScience&Engineering CentralSouthUniversityChangsha410083.China Dept.MaterialsTechnologyandElectrochemistry NorwegianUniversityofScienceandTechnologyTrondheim7491Norway

The anodic over voltage of the carbon anode in aluminumelectrolysis is of the order of 0.6 V at normal current densities.However, it can be reduced somewhat by doping the anode carbon withvarious inorganic compounds. A new apparatus was designed to improvethe precision of over voltage measurements. Anodes were doped withMgAl_2O_4 and AlF_3 both by impregnation of the coke and by addingpowder, and the measured over voltage was compared with that ofUndoped samples. For prebake type anodes baked at around 1150 deg. C,the anodic overvoltage was reduced by 40-60 mV, And for Soderbergtype anodes, baked at 950 deg. C, by 60-80 mV.

关键词： electrocatalysis carbon anode aluminum electrolysis