共查询到20条相似文献,搜索用时 312 毫秒
1.
2.
钛离子在低碳钢电极上电化学还原过程 总被引:1,自引:0,他引:1
采用循环伏安法及卷积伏安法研究了 LiCl-KCl 熔盐体系中低价钛离子的电化学还原过程。研究表明,低价钛离子在低碳钢电极上的阴极还原过程为产物可溶的电化学极接近可逆反应。同时还发现,在制备低价钛的过程中可能有杂质产生,这种杂质估计是钛的氯氧化物。 相似文献
3.
5.
6.
本文采用三种电化学研究方法探讨了酸性氯盐水溶液中离子在钛电极上阴极还原的电极过程动力学规律和电极反应的可能机理。 相似文献
7.
熔盐中Al—Ti合金共沉积的电极过程 总被引:4,自引:0,他引:4
应用循环伏安等电化学测量方法,研究了在低温(200℃)熔盐体系中铝阴极还原及铝,钛共沉积的电极过程,提出铝,钛共沉积的电极过程为二步反应,即Ti^3+首先还原为i^2+,继而为Ti^2+与Al^3+离子的共沉积,形成Al+Ti合金镀层。 相似文献
8.
9.
10.
11.
电解铜中的氢对铜线坯拉丝影响的实践(上篇:电解铜与熔炼) 总被引:1,自引:1,他引:0
阴极铜电解过程中使用的添加剂是阴极铜增氢的一个主要因素,阴极铜表面有大量凸瘤时,氢含量可增加数倍以上,感应电炉采用微还原性气氛熔炼,对氢无能为力,氢在铸造凝同时析出,过量气体的逸出会造成品界脆弱,导至轧制中开裂,影响线坯拉制微细线的性能。不能逸出的氢气体在铸坯中形成气孔,是拉线断线的一个主要原因。根据阴极铜质量和熔炼方式,在阴极铜熔化过程中,最大限度的降低氢的含量。 相似文献
12.
由于膜的吸水特性,高压质子交换膜(PEM)制氢(尤其是差压式,氢侧高压/氧侧常压)存在氢气渗透问题,影响电解堆的运行安全与效率。基于菲克定律描述的渗透通量与渗透率、分压差的关系,综述了温度/压力、膜水合程度、氢气分压差对氢气渗透的影响规律。在常规运行压力范围(3.5 MPa)内,扩散系数与溶解度主要受温度影响,温度升高则渗透率增大;氢气渗透率随膜水合程度的增加而增大;氢气分压差对渗透的影响表现出线性(渗透池环境)与非线性(电解制氢环境)两种关系,非线性可能源于膜透水性提升与水通道结构改变引起的对流渗透。考虑到电解制氢实际工况存在电流,综述了电流密度对氢渗透的影响,氢气渗透率随运行电流密度的升高而增大,氢过饱和是可能的影响机理,高电流密度下氢过饱和度升高,导致氢气通过膜的渗透增加。 相似文献
13.
周楠 《有色金属(冶炼部分)》2024,(2):28-34
阴极铜质量的稳定关系到企业品牌形象的稳固和产量任务的顺利完成。获得板面平整、结晶致密、化学成分合格、物理外观良好的阴极铜一直是贵溪冶炼厂电解车间提升工艺技术水平的重点工作。通过对阴极铜表面质量影响因素的综合分析,深入追踪阴极铜电解生产环节中由物料指标控制、循环系统生产环境、产品输出洗涤质量所带来的一系列不足之处,从中总结归纳出阴极铜表面质量缺陷把控关键性技术措施,为阴极铜电解生产质量的提高做出进一步的保障。 相似文献
14.
随着阴极铜产品质量要求越来越严格,技术人员对影响阴极铜质量的因素进行分析,最终找到了导致阴极铜板面附着酸性杂质的原因。技术人员通过对剥片洗涤机组增加二次洗涤系统,自动夹边条校边装置,优化一次洗涤系统等设备改造,同时规范了工艺操作过程,明确了对喷嘴和洗涤水的清洁要求,通过实践的开展有效地避免机组洗涤后的阴极铜板面附酸的现象,有力地提升了阴极铜产品质量。 相似文献
15.
Pati Soobhankar Yoon Kyung Joong Gopalan Srikanth Pal Uday B. 《Metallurgical and Materials Transactions B》2009,40(6):1041-1053
A laboratory-scale solid oxide membrane (SOM) steam electrolyzer that can potentially use energy value in waste or any source
of carbon or hydrocarbon to produce high-purity hydrogen has been fabricated and evaluated. The SOM electrolyzer comprises
an oxygen-ion-conducting yttria-stabilized zirconia (YSZ) electrolyte with a Ni-YSZ cermet cathode coated on one side and
liquid-metal anode on the other side. The SOM electrolyzer is operated at 1000 °C by providing a steam-rich gas feed to the
Ni-YSZ cermet cathode and feeding a reductant source into the liquid-metal anode. The steam is reduced over the cathode, and
oxygen ions are transported through the YSZ electrolyte and are oxidized at the molten metal electrode by the reductant feed.
The advantage of SOM electrolyzer over the state-of-the-art solid oxide electrolyzer is its ability to use solid, liquid,
and gaseous reductant feed in the liquid-metal anode to reduce the oxygen chemical potential and drive the reaction for hydrogen
production. In this study, an electrochemical process model for a SOM electrolyzer was developed. The condition of the liquid-metal
anode with reductant was simulated by bubbling humidified hydrogen (3 pct H2O) in the liquid metal, and the electrochemical performance of the SOM electrolyzer was modeled. The experimental data were
curve-fitted into the model to identify the various polarization losses. It showed that the performance of the SOM electrolyzer
was dominated by the ohmic resistance of the YSZ membrane. Based on the results of this study, future work is needed toward
increasing the performance efficiency of the SOM electrolyzer. 相似文献
16.
介绍连铸连轧法试制电解电容器用铝质负极箔的工艺研究过程。在生产中高品质的铸轧坯料和合理的轧制工艺是生产负极箔的关键。经过试制证明用连铸连轧法能生产出高品质的负极箔。在外观质量和腐蚀性能上都能满足客户的标准要求。 相似文献
17.
18.
19.
Groundwater contamination by chlorinated ethenes is a widespread environmental problem. Shortcomings in conventional remediation methods have motivated research into novel treatment technologies. A palladium/alumina catalyst in the presence of molecular hydrogen gas (referred to hereafter as the Pd/H2 system) has been demonstrated to destroy chlorinated ethenes in contaminated groundwater. This study presents a model for aqueous-phase destruction of chlorinated ethenes in contaminated groundwater using the Pd/H2 system that includes catalyst deactivation and regeneration. The model is validated using published data from laboratory column experiments from Stanford University. The model is then coupled with an analytical groundwater flow model to simulate application of in-well Pd/H2 reactors for in situ treatment of chlorinated ethene contaminated groundwater in a recirculating horizontal flow treatment Well (HFTW) system. Applying the model under realistic conditions results in approximately 130 days of HFTW system operation without significant catalyst deactivation. This suggests catalyst deactivation will not significantly affect system performance in a real remediation scenario. The model presented in this study, which simulates deactivation kinetics and regeneration of an in-well catalyst that is a component of a recirculating well system designed for in situ treatment of contaminated groundwater, represents an important step in transitioning the Pd/H2 technology to the field. 相似文献