高电流密度TiB2/G阴极泄流式铝电解槽的电解实验

详述了泄流式TiB2/G阴极电解槽的制作与电解运行操作.在焦粒焙烧、干法启动后,保持1.54 A/cm2的高阳极电流密度进行140 h电解实验,平均电流效率为86.5%.实验过程中,TiB2/G层稳定而牢固,其腐蚀脱落速度为0.4 g/(h·m2),能很好地保护阴极基体.利用铝参比电极由瞬时断电技术测得泄流式电解槽的阳极过电压和阴极过电压,它们与对应的电流密度遵循塔菲尔方程关系,其阳极过电压与工业电解槽相当,而其阴极过电压比工业电解槽的高0.4 V左右.这可能是由于泄流式电解槽中不存在铝液波动,阴极表面附近的电解质分子比远高于工业电解槽阴极表面的电解质分子比.     

TiB2—C复合阴极在铝电解槽上的应用

介绍了采用碳素厂直接生产的ＴｉＢ２－Ｃ复合阴极在铝电解槽上的提效降耗效果。其优点是：工艺简单、成本低、ＴｉＢ２不易脱落、原铝质量中钛含量低，是铝电解槽应用ＴｉＢ２技术的一大进步。     

应用新一代常温固化TiB2阴极涂层技术提高我国预焙铝电解槽寿命

介绍了我国铝电解工业的发展现状；指出了我国预焙铝电解槽寿命短的弊端；讲述了电解槽早期破损的原因和采用TiB2阴极涂层技术提高电解槽寿命的机理：叙述了新一代常温固化TiB2阴极涂层的特点，并强调应用新一代常，温固化TiB2阴极涂层技术，提高电解槽寿命，是符合我国国情，且行之有效的措施。     

铝电解槽TiB2涂层阴极技术

将含有ＴｉＢ２、碳纤维和热固性粘结剂的涂料，涂敷到铝电解槽的阴极基体上，制备出可润湿的阴极表面。经固化和碳化后，涂层和碳质基体材料的粘结力强，热膨胀匹配性好。每台硼化钛涂层阴极试验槽能节省ＮａＦ２５０～３００ｋｇ，试验槽的电流效率高出对比槽１．４４％，能耗降低１７５～２１１ｋＷ·ｈ／ｔＡ     

TiB2—C复合阴极在45kA铝电解槽上的应用

ＴｉＢ２－Ｃ复合阴极在两以４５ｋＡ铝电解槽上进行的工业试验，经过一年多的对比考核，证明这种阴极材料确有提效降耗效果。电流效率提高２．８４％，交流电单耗降低５３９ｋＷｈ／ｔＡｌ。     

铝用TiB2—C复合阴极炭块的开发与应用

介绍了一体化成型TiB2-C复合层阴极炭块和TiB2-C复合冷捣糊的研制、产品检测，在75kA工业预焙槽上的应用试验以及经济效益与社会效益分析。     

惰性电极大型铝电解槽设计实验

进行了具有金属陶瓷惰性阳极及TiB2隋性阴极的电解扩大实验研究.电解实验过程38h,电流强度150A,阳极未出现任何破损和变形.相关性能测试结果较理想,阳极腐蚀速率为23mm/a,电解所得阴极铝的纯度经测定达到97.3%.实验证明设计的3000A～6000A平行配置惰性阳极和TiB2惰性阴性新型铝电解槽是可行的.     

60kA侧插铝电解槽阳极锥体槽外焙烧及焙烧炉改进

通过铝电解技改工程中采用不同的阳极铸型方法,讨论阳极锥体槽内焙烧与槽外焙烧的特点,重点阐述了槽外焙烧的工艺技术要求及焙烧设计。通过改进焙烧炉设计提高,阳极铸型质量满足了铝电解生产的工艺要求。     

TiB2—C复合阴极在铝电解槽上的应用效果

采用碳素厂直接生产的ＴｉＢ２－Ｃ复合阴极在两台铝电解槽上进行实用工业试验，经一年多的对比考核，证明这种复合阴极的优点是：工艺简单、成本低、ＴｉＢ２不易脱落，原铝质量中钛含量低，提效降耗的效果为：电流效率提高０．９５％，节电９５ｋＷｈ／ｔ．铝是铝电解槽应用ＴｉＢ２技术的一大进步。     

导流槽阴极导杆安装方式对阴极表面电流分布的影响

将某厂现有的160kA Hall—Heroult铝电解槽改造成导流槽后，在阴极上表面和阳极底面呈斜坡状的条件下，计算了采用不同阴极导杆安装方式时阴极的电位和电流分布，即通过建立导流槽内部从阳极到阴极的一个半切片电热场模型，用有限元法分别对水平和平行于阴极斜坡两种不同导流槽阴极导杆的安装方式下阴极电位和表面电流密度分布进行了计算。结果表明，不同的阴极导杆安装方法对导流槽阴极的总电位降大小没有明显影响，但是水平阴极导杆安装更有利于阴极表面电流密度的均匀分布。     

Heat balance simulation of drained aluminum reduction cell

1　INTRODUCTIONThecarbon linedbottomoftheexistingHall Heroult(H H)cellworksasthecathodeandalsoasacontainer ,inwhichthemoltenaluminumpadisaccu mulatedtoaheightofabout 18to 2 0cm .Themetalpadisbeneficialtothewettabilityofthecarboncath odeandthereductionofcontactresistancebetweenthecarboncathodeandaluminumliquid .However ,becausethemoltenaluminumpadwhichalsoservesasthecellcathodecanbecomeirregularandvariableinthicknessduetoelectromagneticeffectsandbathcir culation ,itisrequiredthattheanodec…     

异型阴极电解槽焙烧方法的探索研究

通过对阴极电解槽的燃气焙烧法、以阳极炭块作为填充物的焦粒焙烧法以及以电解质块作为填充物的异型阴极焦粒焙烧方法的分析研究,根据试验数据和运行状况,认为以电解质块作为填充物的方法在生产实际中运用能够成功解决异型阴极电解槽其它焙烧方法存在的弊端.     

Ambient temperature cured TiB_2 cathode coating for aluminum electrolysis

1　INTRODUCTIONAluminumindustryhasbeendevelopingrapidlyinChinainrecentyears ,soderbergcellshavebeenre placedwithmodernprebakecellsinmanyaluminumsmelters,theaveragecelllifehowever ,forprebakecellsinourcountrywasonlyabout130 0d ,muchlowerthantheaveragecelllife ,i.e .above 2 5 0 0d ,forthecellsindevelopedcountries .TiB2 cathodecoating (TCC)couldbeoneofthesolutionstoreducegreatlytheopportunitytotheearlyfailureofcellsandextendthecelllifeofprebakecell[14 ] .Theconceptoftitaniumdiboride (TiB2 …     

75kA导流槽磁场及其引起的铝液流场模拟分析

以商用有限元计算软件ANSYS为计算平台,对75kA导流型铝电解槽电磁场和电磁力场分布及其对铝液流动和波动的影响进行了模拟计算。结果表明：阴极斜坡表面电磁场和电磁力场分布基本呈沿电解槽长轴对称分布,且电磁力与重力方向相同,这有利于阴极表面电磁力向聚铝沟排放,而在电磁力作用下,聚铝沟内铝液波动最大幅度为0.021m,仍保持在安全范围之内,不会引起两极短路现象的发生,表明在现有75kA普通预焙槽母线配置方案下,可以维持导流型结构电解槽的正常运行。     

Mathematical simulation of gas induced bath flow in drained aluminum reduction cell

A mathematical model describing the bubble driven bath flow in a drained cell with a center sump was presented, which spanned the fluid around half an anode and was developed to simulate the flow fields. The calculated results show reasonable agreement with the experiment. Then the model was developed to a full cell model, and bath flow pattern in the whole cell was predicted and analyzed. The flow pattern variation with the changes of the ACD, anode slope, anode immersion depth and current density, especially the fluid secondary recirculation, was modeled. According to the results, side channel or slots feeding technique was recommended in such a drained cell.     

铝电解质对TiB2镀层的渗透

采用熔盐体系在石墨基体上电沉积制备了TiB2镀层．将TiB2镀层和铝电解阴极碳块和石墨分别作为阴极，考察了Na和电解质对其渗透腐蚀．电解4h后，由酚酞试剂检测表明，Na对TiB2镀层的渗透深度为零，对阴极炭块的渗透深度为16mm，对石墨的渗透深度为4mm．电子探针的分析结果指出，Na和F元素渗透到石墨基体的量很少，元素Al相对较多，TiB2镀层阻碍了Na的产生并减缓了Na的渗透，但没有改变Na的渗透机理．同时。镀层与基体的结合力良好，Al对TiB2镀层的湿润性良好．     

Physical modeling of gas induced bath flow in drained aluminum reduction cell

A room temperature physical model was used to study the bubble behavior and gas induced bath circulation in a drained aluminum reduction cell. By passing compressed argon through the penetrated Plexiglas box bottom plate immersed in water, gas evolution at the anode bottom surface was simulated. Bubble behavior and liquid flow field were studied and analysis was presented. Bath secondary recirculation was observed in the interpolar gap not the net rising flow as expected. Liquid driven by the bubbles forms small vortices along the interpolar gap with small mean and turbulent velocities and accordingly poor mass transfer. Secondary recirculation also exists between the slot and interpolar gap, part of the flow in the interpolar gap go to the slot with the bubbles and fluid at the bottom of the slot enters the interpolar gap directly without going to the center channel. The existence of the fluid secondary recirculation is very unfavorable to the alumina dissolution and dispersion. Increasing the anode tilt or gas flow rate, or decreasing the anode-cathode distance can make the secondary recirculation in the interpolar gap weak, however, will intensify the secondary recirculation between the slot and interpolar gap.