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2003-2017 冶金工程技术
为您找到包含“”的内容共300

冯乃祥,彭建平,戚喜全,姜艳丽

2009-01-08

本文对新型结构泄流式电解槽的热电场进行了数值模拟。对于有可能影响电解槽能量平衡的因素分别进行了讨论。计算结果表明,将75kA预焙电解槽改造成泄流式电解槽后,由于极距的降低,能量收入的减少,电流强度须强化至94kA可维持较好的能量平衡。在阴极倾角小于9o 之前,阳极、阴极、极间及槽总体压降随倾角增大而降低,大于9o 后则随之升高。在倾角9o 左右能量平衡效果最佳。聚铝沟内铝液面越低,阳极、阴极、极间及槽总体压降越高,在铝液充满聚铝沟时,阳极、阴极、极间及槽总体压降最低,且能量平衡效果最佳。聚铝沟宽度越小,槽压降越高。在聚铝沟宽度与边部加工面同宽时,能量平衡效果最好。适当加强侧部保温,并将电流降低至87kA时,电解槽总体压降较低,能量平衡效果较好,且侧部炉帮占据聚铝沟空间较小。此方案更为理想。

教育部博士点基金(20050145005

国家自然科学基金(50274031

东北大学材料与冶金学院,东北大学材料与冶金学院,东北大学材料与冶金学院,东北大学材料与冶金学院

#冶金工程技术#

0评论(0 分享(0)

彭建平,冯乃祥,戚喜全,何冲

2009-01-08

本文选用具有较高的耐火度和较好化学稳定性的耐火原料,用捣制法制成了泄流式铝电解槽阴极碳块侧下部周围的耐火混凝土材料,并取样对不同温度下的膨胀系数和抗冰晶石熔体的腐蚀性能进行测定与实验。测定与实验研究结果表明:由本研究制成的泄流式铝电解槽阴极碳块侧下部周围的耐火混凝土材料比现行工业铝电解槽上使用的耐火混凝土材料具有较高的热膨胀系数和较好的抗电解质熔体腐蚀的性能。

教育部博士点基金(20050145005

东北大学材料与冶金学院,东北大学材料与冶金学院,东北大学材料与冶金学院,东北大学材料与冶金学院

#冶金工程技术#

0评论(0 分享(0)

冯乃祥,戚喜全,彭建平,姜艳丽

2009-01-09

本文通过对不同电解质成分及不同TiB2/C涂层配比条件下,电解过程的阳极过电压和阴极过电压实验研究,得出:在相同电解温度下,电解槽阴极过电压随分子比的升高而降低。阴极涂层中TiB2含量对阴极过电压有着显著影响。随TiB2含量增加,涂层抵抗NaF和Na离子渗透能力加强,导致阴极表面Na离子层加强,阴极过电压增加。阴极过电压与阴极电流密度也遵循Tafel方程,但Tafel方程的斜率和截距都明显小于阳极过电压Tafel 方程中的斜率和截距。另外,从测试结果看,实验室电解槽上的阴极过电压比现行工业电解槽的阴极过电压高,这是由于实验室电解槽中不存在剧烈的熔体流动,不能给离子层以扰动的原因。

教育部博士点基金(20050145005

国家自然科学基金(50274031

东北大学材料与冶金学院,东北大学材料与冶金学院,东北大学材料与冶金学院,东北大学材料与冶金学院

#冶金工程技术#

0评论(0 分享(0)

李百松,薛济来,朱骏

2009-01-13

采用自行研制的高温电阻测试仪分别测定了石墨、含30%TiB2功能材料和TiB2-C/C功能梯度阴极试样在接近铝电解使用条件下的电阻率。研究结果表明:添加TiB2功能过渡层可降低阴极试样的电阻率;电解后阴极试样的电阻率会有所增加,但添加过渡层会减少电解后阴极试样电阻率的增加幅度。

北京科技大学冶金与生态工程学院,北京科技大学冶金与生态工程学院,北京科技大学冶金与生态工程学院

#冶金工程技术#

0评论(0 分享(0)

Zhen-shan Cui,Jin-ling Zhang,Juan Liu

A temperature model for plate hot rolling is developed by using series function solution. The model is a part of mixed analytical-numerical modeling aiming at the prediction of deformation variables and microstructure evolution for plate production by hot rolling. The model takes into account the heat generated by deformation and the cooling effects resulted from hydraulic descale sprays, work roll chilling, radiation heat flux in interstand areas and on-line water cooling operations. To accomplish the continuous computation of temperatures in the whole process, compatible relationships of constants in the solutions are successfully established between passes and operations. The model is employed in the simulation of an experimental 3-passes rolling of type 304 stainless steel plate and an industrial 12-passes rolling of Q235A steel plate. The comparison of computed temperature with measured data demonstrates a favorable coincidence, which verifies the validity of the model. The application also indicates that the model can be easily employed in simulation of multi-pass rolling and other continuous operations, with a quite short computational time.

2009-01-14

教育部博士点基金(20050248007

Shanghai Jiao Tong University,Shanghai Jiao Tong University,Shanghai Jiao Tong University

#Metallurgical Engineering#

0评论(0 分享(0)

陈兴,薛济来,朱骏

2009-01-16

铝电解阴极材料的铝液润湿性直接影响到阴极的抗钠和抗电解质的侵蚀和渗透性能,是评价阴极材料性能的重要指标之一。本文采用改进的座滴法测量了不同石墨(G)含量和不同TiB2含量的C/G/TiB2复合阴极材料的两组试样的Al液润湿性,实验在900℃下进行,采用高纯氩气作为保护气氛。结果显示:当石墨含量小于70%时,石墨含量的增加,Al液润湿性改善;当石墨含量大于70%时,石墨含量的增加,Al液润湿性变差。TiB2含量小于30%时,TiB2含量增加,Al液润湿性明显改善;TiB2含量大于30%时,TiB2含量增加,Al液润湿性改善,但是改善的程度已不明显。本文还通过XRD、SEM对阴极材料与Al液界面反应与润湿过程的关系进行了讨论,认为界面反应与润湿过程有直接关系。

北京科技大学有色系,北京科技大学有色系,北京科技大学有色系

#冶金工程技术#

0评论(0 分享(0)

Liang Sha,Guo Xueyi,Feng Ningchuan,Tian Qinghua

The present article describes the adsorption behaviors of Cu2+ and Cd2+ on chemically modified waste orange peel. The adsorbents were characterized using scanning electron microscopy and infrared spectrophotometer. The effect of various parameters like solution pH, shaking time, initial metal ion concentration and temperature on adsorption efficiencies of these two metals were studied systematically by batch experiments.. Adsorption isotherms of these two metals on orange peel and chemically modified orange peel were obtained and compared with Langmuir and Freundlich type models. The rate of adsorption of Cu2+ and Cd2+ on chemically modified orange peel at a constant temperature (25 oC) found to follow a pseudo-second order equation, indicating their chemical adsorption. Temperature has a negative impact on Cu2+ adsorption, while Cd2+ adsorption found to be more or less independent of temperature. Maximum adsorption capacities of Cu2+ and Cd2+ on the chemically modified orange peel were found to be 70.67 and 136.05 mg/g, respectively. Adsorption–desorption studies made on chemically modified orange peel showed that, the adsorption capacities remain high until 5th cycle. This study demonstrated that, the waste orange peel after simple chemical treatment could be used as a potential adsorbent for toxic metals such as Cu and Cd.

2009-01-22

国家自然科学基金(50774100

Central South University,Central South University,Central South University,Central South University

#Metallurgical Engineering#

0评论(0 分享(0)

郭学益,梁莎,冯宁川,田庆华

2009-01-22

本文研究了经巯基乙酸改性的橘子皮吸附剂对Pb2+的吸附性能。考察了溶液pH值、吸附时间及Pb2+初始浓度对该吸附剂吸附性能的影响。结果表明,吸附过程可以很好地用准二级动力学方程描述,吸附等温线用Langmuir方程拟合效果优于Freundlich方程。pH4.5,30℃时最大吸附容量为146.413mg•g-1。经改性的橘子皮可重复使用5次以上。

国家自然科学基金(50774100

中南大学冶金科学与工程学院,中南大学冶金科学与工程学院,宁夏医学院基础学院,宁夏医学院基础学院

#冶金工程技术#

0评论(0 分享(0)

Liang Sha,Guo Xueyi,Feng Ningchuan,Tian Qinghua

Pristine orange peel was chemically modified by introducing sulphur groups with the carbon disulfide treatment in alkaline medium. The presence of sulphur groups on orange peel xanthate were identified by FTIR spectroscopic study. Equilibrium isotherms and kinetics were obtained and the effect of various parameters including equilibrium pH, contact time, temperature and initial ion concentration on adsorption of Pb2+ were studied by batch experiments. The maximum adsorption capacity of orange peel xanthate was 204.50 mg•g-1, which was found to increase by about 150% compared to that of pristine orange peel. The adsorption process can attain equilibrium within 20 min, and kinetics was found to be best-fit pseudo-second order equation. Temperature has little effect on the adsorption capacity of orange peel xanthate. In addition, the adsorption mechanism was proposed.

2009-01-24

National Natural Science Foundation(50774100

School of Metallurgical Science and Engineering,Central South University,School of Metallurgical Science and Engineering,Central South University,School of Metallurgical Science and Engineering,Central South University,School of Metallurgical Science and Engineering,Central South University

#Metallurgical Engineering#

0评论(0 分享(0)

Guo Xueyi,Zhong Juya,Song Yu,Tian qinghua

The method of Substance Flow Analysis (abbreviated as SFA) provides a helpful tool for the study of the industrial metabolism of a certain metal within a regional level. Zinc is one of the important strategic commodities of national economic development in China, the resources utilization and recycling of which is important for the sustainable development of China\

2009-01-27

School of Metallurgical Science & Engineering, Central South University,School of Metallurgical Science & Engineering, Central South University,School of Metallurgical Science & Engineering, Central South University,School of Metallurgical Science & Engineering, Central South University

#Metallurgical Engineering#

0评论(0 分享(0)