共查询到20条相似文献,搜索用时 261 毫秒
1.
2.
3.
4.
大型预焙铝电解槽碳耗问题的研究 总被引:1,自引:0,他引:1
根据铝电解过程的总反应方程式导出的用阳极气体组成表示的碳消耗计算公式,对我国两种不同容量的大型预焙铝电解槽正常生产的阳极气体组成进行了检测分析,以此计算出碳阳极的净耗;结合我国大型预焙铝电解槽生产现状,对实际碳耗进行了分析研究提出进一步降低碳耗的措施。 相似文献
5.
6.
7.
8.
通过对石油焦体积密度、真密度改性研究 ,采用压密石油焦新技术 ,使预焙阳极块生产过程中煤沥青加入量控制在 12 %。通过对煤沥青成分改性研究 ,生产出甲苯不溶物 >2 8%、喹啉不溶物 <2 % ,β树脂含量 >2 5 % ,软化点90℃左右的煤沥青 ,使预焙阳极可以在 <160℃条件下混捏 ,同时提高了煤沥青分散性、润滑性、结合强度、石墨化程度。用上述研究成果 ,实现新型预焙阳极块体积密度 1.6g/cm3、耐压强度 3 5MPa、电阻率 5 0 μΩ·m。与常规方法生产的预焙阳极进行比较 ,研究其改性后的石油焦、煤沥青使用特性 ,满足铝电解工业炭素材料发展要求 相似文献
9.
铝工业现代化发展的标志,是建造新结构的预焙阳极电解槽。电解槽容量的增加和碳块尺寸的加大,要求必须制订一套新的阳极质量要求。据国外研究资料,国外鉴定预焙阳极碳块的质量 相似文献
10.
11.
1 INTRODUCTIONAluminummetallurgyadoptsthemethodofhightemperaturemeltsaltelectrolysisdevelopedonehun dredyearsago .Intheprocessofresearchanddevel opmentinthisfield ,physicalchemistry ,electro chemistry ,materialscience ,roboticizedtechnologyandsoonwerecombinedwithaluminummetallurgytechniques,makingthebasicprincipleoftheHall Heroultprocessbeingmoredeeplyrealizedbypeople .Furthermore ,thistechnologywasdevelopedcon stantlyandbecamemoreandmoreperfectinordertofurthersaveenergy ,reducerawmateri… 相似文献
12.
铝电解用炭阳极的综合性能 总被引:2,自引:0,他引:2
在阐述了炭阳极在铝电解生产中所起的重要作用的基础上,对我国铝电解用炭阳极的物理化学性能和电化学性能进行了综合评述,并指出了我国铝电解用炭阳极存在的不足,最后阐述了目前阳极质量改进的一些途径,并从阳极添加剂技术的角度对我国铝电解用炭阳极质量的改进提出了系列建议。 相似文献
13.
在实验室制备各类AlF3掺杂试验阳极,在测试其基本物理化学性能的基础上,采用“改进断电流法”进行阳极过电位测试,研究AlF3添加剂和阳极焙烧温度对阳极过电位的影响。结果表明:在一定条件下,阳极中添加AlF3既可降低阳极的空气/CO2反应活性,也可降低阳极过电位;受高温脱S等因素的影响,阳极的电化学活性及其空气/CO2反应活性并未随着焙烧温度的提高相应降低。 相似文献
14.
1 INTRODUCTIONInaluminumelectrolysis process ,thequantitygradeofcarbonanoderestrictsnotonlytheimprove mentofproductiontechniques ,butalsotheadvance mentofproductiontargets.Formany years ,largenumberofresearchesweredonetoimprovethephysi cal,chemicalandelectrochemicalperformanceoftheanodeinordertoenhancecurrentefficiency ,reduceenergyconsumption ,decrease productioncostandcleancircumstanceofaluminum plantanditssur roundingarea .Recently ,manylaboratoryresearchresultsweresuccessfullyappliedf… 相似文献
15.
16.
《中国有色金属学会会刊》2020,30(8):2067-2078
Al−Zn−Mg alloys with different Zn/Mg mass ratios were evaluated as sacrificial anodes for cathodic protection of carbon steel in 3.5 wt.% NaCl solution. The anodes were fabricated from pure Al, Zn and Mg metals using casting technique. Optical microscopy, SEM−EDS, XRD and electrochemical techniques were used. The results indicated that with decreasing Zn/Mg mass ratio, the grain size of α(Al) and the particle size of the precipitates decreased while the volume fraction of the precipitates increased. The anode with Zn/Mg mass ratio >4.0 exhibited the lowest corrosion rate, while the anode with Zn/Mg mass ratio <0.62 gave the highest corrosion rate and provided the highest cathodic protection efficiency for carbon steel (AISI 1018). Furthermore, the results showed that the anode with Zn/Mg mass ratio <0.62 exhibited a porous corrosion product compared to the other anodes. 相似文献
17.
炭阳极原料中稀土元素镧(La)铈(Ce)对其性能影响 总被引:2,自引:0,他引:2
利用扫描电子显微镜-能谱仪(SEM-EDS)和X射线荧光分析仪(XRF)对炭阳极原料进行表征分析,发现某种炭阳极生产原料中含有稀土元素镧(La)和铈(Ce)。并对含有稀土元素和未含有稀土元素的炭阳极的三个主要指标:二氧化碳反应性、空气反应性和空气渗透率进行了分析测试,结果显示稀土元素对于炭阳极的空气渗透率有提高作用,而对于炭阳极的反应性有催化作用,会加快炭阳极的消耗。 相似文献
18.
Consumable carbon anodes are used in the electrowinning of aluminium by the Hall-Heroult process.Emissions of CO2 may be eliminated by introducing an inert oxygen evolving anode,which however will require a higher anode potential.An alternative approach is to use a natural gas or hydrogen gas anode to reduce the CO2 emissions and lower the anode potential.Preliminary laboratory experiments were carried out in an alternative molten salt electrolyte consisting of CaCl2-CaO-NaCl at 680 °C.Porous anodes of platinum and tin oxide were tested during electrolysis at constant current.The behaviour of inert anode candidate materials such as tin oxide and nickel ferrite were also studied. 相似文献
19.
锌电积作为湿法炼锌的重要环节,其阳极析氧电位对于节能降耗和提高产品质量极为重要。基于纳米碳材料的析氧催化活性,本文分别研究了典型的0维、1维和2维等6种碳纳米材料作为催化增强相制备铅基复合阳极,并在模拟锌电积条件下通过循环伏安曲线、阳极极化、交流阻抗测试以及耐蚀测试比较了复合阳极的电化学行为。纳米碳材料作为增强相掺杂金属铅形成的金属基复合材料表现出优异的析氧电催化活性,其在500A/m2恒电流极化条件下,稳定电位较纯铅低96mV以上。2维碳材料电化学催化性能不如0维碳材料,1维材料性能最佳,1维材料表面修饰官能团或者负载功能颗粒后,电催化性能有显著提升。 相似文献
20.
LAIYanqing LIUYexiang YANGJianhong THONSTADJomar 《稀有金属(英文版)》2002,21(2):117-122
The anodic overvoltage of the carbon anode in aluminum electrolysis is of the order of 0.6 V at normal currem densities. However, it can be reduced somewhat by doping the anode carbon with various inorganic compounds. A new apparatus was designed to improve the precision of overvoltage measurements. Anodes were doped with MgAl2O4 and AlF3both by impregnation of the coke and by adding powder, and the measured overvoltage was compared with that of undoped samples. For prebake type anodes baked at around 1150℃, the anodic overvoltage was reduced by 40-60 mV,and for Soderberg type anodes, baked at 950 ℃, by 60-80 mV. 相似文献