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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
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电解铝降低阳极碳耗的途径与措施 总被引:8,自引:1,他引:7
阐述了冰晶石一氧化铝电解法生产铝的炭阳极消耗机理。推导出炭阳极与CO2作用以及炭阳极与空气反应阳极消耗数量的计算公式和在电解铝生产过程中如何确定过量消耗碳量。电解过程中炭阳极消耗与电解槽设计、电解工艺操作、阳极质量等有关,并提出了新型阳极炭块形状及结构型式。以及降低阳极碳消耗途径与措施。 相似文献
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《中国有色金属学报》2017,(5)
采用含TiO_2炭阳极直接熔盐电解制备低钛铝合金。对含TiO_2炭阳极在CO_2/空气中的残余率分别进行测试,用XRD对含钛沥青焦进行分析,运用SEM和EDS手段对炭阳极、原铝和电解铝的形貌和组成进行表征。结果表明:TiO_2的添加可显著改善炭阳极在CO_2和空气中的残余率,当TiO_2添加量(质量分数)为1%时,炭阳极在CO_2中的残余率由76.3%急剧增加到93.5%,在空气中的残余率从51.87%增加到65.92%;TiO_2在炭阳极制备过程中其化学成分未发生变化,含TiO_2炭阳极在电解过程中运行稳定;随着炭阳极的消耗,TiO_2溶入电解质中,可实现低钛铝合金的制备。 相似文献
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对于炭阳极生产企业来说,阳极理化指标的好坏可直接从阳极在电解槽的消耗中体现出来,阳极消耗的速度过快,阳极在电解槽中的使用周期过短,将增加企业的生产成本,说明阳极质量还需改善。而阳极消耗速度与阳极的抗氧化性能有很大的关系,抗氧化性能低的阳极还来不及参与化学反应,就已经以炭渣的形式脱落,沉淀在电解槽,给电解槽作业带来负面影响。在炭阳极实际生产中,通过弥补原料质量缺陷、优化阳极生产工艺控制等举措可以有效改善阳极抗氧化性能,进而降低阳极消耗。 相似文献
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LAIYanqing LIJie LIQingyu DINGFengqi 《稀有金属(英文版)》2004,23(2):109-114
Airbum reaction and carboxy reaction result in the excess consumption of carbon anode in aluminum electrolysis.To reduce the excess carbon consumption, carbon anode was doped with aluminum-containing additives, such as A1, Al4C3,AlF3 and Al2O3. Their reactivity in air and CO2 was determined with an isothermal-gravimetric method to study the effect of aluminum-containing additives on the reactivity in air and CO2 of carbon anode. Results shown that the airbum reactivity at 450℃ and carboxy reactivity at 970℃ of carbon anode both decreased with Al-containing additives adding, while shown a minimum with the amount of Al4C3, AlF3 and Al2O3 increasing. However, all Al-containing additives increase the alrbum reactivity at 550℃ of carbon anodes. Coke yield measurement and XRD examination with aluminum containing additives doped pitch cokes revealed that the effect of Al-containing additives on the airburn reactivity and carboxy reactivity of carbon anode would result from chemical factors and structural factors. 相似文献
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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
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W. K. Fischer R. Perruchoud 《JOM Journal of the Minerals, Metals and Materials Society》1987,39(11):43-45
Critical to the performance of an aluminum reduction cell is anode quality and durability. In recognition of this consideration, the aluminum industry uses a number of standardized tests to evaluate baked anode samples. In addition to these routine evaluation procedures, recent innovations have led to newer methods which are helpful in diagnosing anode problems and improving net carbon usage. Recent work in particular has enlightened operators in such areas as carboxy reactivity, air reactivity, and thermal shock. 相似文献
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《稀有金属(英文版)》2019,(12)
The lithium-ion capacitor is a promising energy storage system with a higher energy density than traditional supercapacitors.However,its cycling and rate performances,which depend on the electrochemical properties of the anode,are still required to be improved.In this work,soft carbon anodes reinforced using carbon-Si composites of various compositions were fabricated to investigate their beneficial influences on the performance of lithium-ion capacitors.The results showed that the specific capacities of the anodes increased significantly by 16.6 mAh g~(-1) with 1.0 wt% carbon-Si composite,while the initial discharge efficiency barely changed.The specific capacity of the anode with a 10.0 wt% carbon-Si composite reached 513.1 mAh g~(-1),and the initial discharge efficiency was 83.79%.Furthermore,the anodes with 7.5 wt% or lower amounts of carbon-Si composite demonstrated reduced charge transfer resistances,which caused an improvement in the rate performance of the lithium-ion capacitors.Moreover,the use of the optimized amount(7.5 wt%) of carbon-Si composite in the anode could significantly improve the cycling performance of the lithium-ion capacitor by compensating the consumption of active lithium.The capacity retention of the lithium-ion capacitor reached 95.14% at 20 C after 10,000 cycles,while the anode potential remained below 0.412 V,which is much lower than that of a soft carbon anode. 相似文献
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随着大型电解槽的不断开发和运用,对预焙阳极提出了更高的要求,而成型工序是影响阳极质量的一个重要环节。本文针对二成型车间一年多来强力冷却机的运行情况以及相应的工艺技术条件的改变进行了说明,并对强力冷却机使用后的质量情况进行了对比。 相似文献
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作为锂离子电池负极材料,硅基材料具有较高的理论比容量、适中的嵌/脱锂电位、与电解液反应活性低等特点,成为最有前景的锂离子电池负极材料之一。然而由于其巨大的体积效应和较低的导电性导致其商业化应用具有相当的挑战性。本文综述了近年来为改善硅基材料的缺点而做的一些研究,展望了硅基材料作为锂离子电池负极材料的发展趋势。 相似文献
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1 INTRODUCTIONAluminummetallurgyadoptsthemethodofhightemperaturemeltsaltelectrolysisdevelopedonehun dredyearsago .Intheprocessofresearchanddevel opmentinthisfield ,physicalchemistry ,electro chemistry ,materialscience ,roboticizedtechnologyandsoonwerecombinedwithaluminummetallurgytechniques,makingthebasicprincipleoftheHall Heroultprocessbeingmoredeeplyrealizedbypeople .Furthermore ,thistechnologywasdevelopedcon stantlyandbecamemoreandmoreperfectinordertofurthersaveenergy ,reducerawmateri… 相似文献