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稀土电解槽内电解质导热系数的计算 总被引:1,自引:1,他引:1
根据混合熔盐导热系数计算原则,通过计算稀土电解槽内电解质单组分熔盐导热系数,从而预测稀土电解槽内三元系电解质熔盐导热系数,为稀土电解槽内温度场的研究提供了一个重要物性参数。 相似文献
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针对熔盐电解制备稀土中间合金过程中电解温度对合金组成的影响很大,通过不同阴极电流密度和电解电流条件对电解槽温度分布的测定,得到了氯化物熔盐电解制备富钇-镍稀土中间合金中电解槽熔体温度分布曲线,对指导生产具有一定的意义。 相似文献
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采用Comsol Multiphysics 有限元软件,基于麦克斯韦原理,在电流不变的情况下,研究建立3 kA稀土钕熔盐电解槽电场数学模型,考察电极插入深度和极距对槽电压、电流密度等电场特征的影响。结果表明,模拟结果与实际生产数据吻合度高,所建立模型能较好地反映钕熔盐电解生产实际;随着电极插入深度的增大和极距的缩短,电解槽电压下降,利于降低电能消耗,但阴极电流密度比阳极电流密度下降快,不利于电流效率提高。应综合考虑能耗和效率,合理调整电极插入深度和极距,以降低钕熔盐电解单位能耗。 相似文献
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随着稀土熔盐电解槽电解过程的进行,阴极形状会随着时间的推移发生电腐蚀,电解槽底部阴极锥角α不断增大,对电解效率与热场产生了一定影响.以越南镝铁阴极稀土电解槽为研究对象,利用COMSOL多物理场耦合软件,计算了稀土电解槽中阴极不同电解阶段不同阴极形状的电解特性参数,得到了电解槽中不同阴极锥角α值与最大电流密度关系曲线图,并分析了电解槽内阴极电蚀对整个电解反应过程的影响,为电解槽的后期维护提供了参考依据. 相似文献
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借助已有的稀土电解槽温度场理论研究成果,以6kA稀土镨钕电解槽为研究对象,根据实测电解生产数据与稀土金属产品的化学检测结果对电解温度与稀土熔盐电解技术指标之间的关系进行了分析。结果表明,温度对电解过程的正常进行起着重要作用;能使本稀土镨钕电解槽实现高效、稳定生产的最佳电解温度为1 090℃。 相似文献
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《有色金属科学与工程》2019,(6)
随着稀土熔盐电解槽电解过程的进行,阴极形状会随着时间的推移发生电腐蚀,电解槽底部阴极锥角α不断增大,对电解效率与热场产生了一定影响.以越南镝铁阴极稀土电解槽为研究对象,利用COMSOL多物理场耦合软件,计算了稀土电解槽中阴极不同电解阶段不同阴极形状的电解特性参数,得到了电解槽中不同阴极锥角α值与最大电流密度关系曲线图,并分析了电解槽内阴极电蚀对整个电解反应过程的影响,为电解槽的后期维护提供了参考依据. 相似文献
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通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。 相似文献
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K Ohta M Nishi M Ueda S Ohyama T Matsubara T Takahashi T Nakajima 《Canadian Metallurgical Quarterly》1998,99(9):589-594
Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients. 相似文献
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Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies. 相似文献
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鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美". 相似文献
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针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。 相似文献
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The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed. 相似文献