稀土抛光粉颜色的表征及影响因素研究

文章基于R·S·Hunter提出的Lab空间色彩体系建立了稀土抛光材料颜色的定量表示方法.该方法可以明确表示出稀土抛光材料色彩的色相、纯度、明度等色彩特征.并且针对少钕碳酸稀土生产的稀土抛光粉影响颜色变化的几个因素进行了研究,找出了焙烧温度及焙烧时间对抛光粉色度的影响关系,为将来把抛光粉色度参数引入到稀土抛光材料性能评价和控制提供可能.     

光学玻璃抛光用稀土抛光粉的制备

以碳酸稀土为原料制备稀土抛光粉,研究了焙烧、分级等工艺条件对制备光学用高性能稀土抛光粉的影响。通过抛光机理,分析影响抛光粉抛光能力的因素,从而找出最佳工艺条件,生产出适合光学玻璃抛光的高性能稀土抛光粉。     

氟化方式对含氟铈基稀土抛光粉性能的影响

通过加入氢氟酸对铈基碳酸稀土进行氟化,得到含氟铈基稀土抛光粉前躯体,再经高温焙烧、粉碎分级,得到含氟铈基稀土抛光粉。研究了两种氟化方式对含氟铈基稀土抛光粉的物相结构、粒度大小及分布、抛光性能的影响。结果表明,氟化方式对铈基稀土抛光粉的抛光能力影响不大,但先碳酸氢铵沉淀后氢氟酸氟化所制备前驱体和抛光粉的粒度显著减小,粒度分布变窄。     

粒度及粒度分布对铈基稀土抛光粉性能影响的研究

粒度及粒度分布是铈基稀土抛光粉的一项重要指标,一般认为抛光粉的粒度较大,其抛光能力也较大;抛光粉粒度较小,其抛光能力也较小。经过实验发现,铈基稀土抛光粉的粒度及粒度分布在一定范围内对其抛光能力的影响几乎微乎其微,可以忽略不计,而粒度及粒度分布在抛光过程中会影响抛光粉抛光后玻璃的表面光洁度。     

从稀土抛光粉废料中回收稀土试验研究

研究了从稀土抛光粉废料中回收稀土,考察了稀土抛光粉预处理方式、焙烧产物粒度、氢氧化钠用量、焙烧温度和焙烧时间对稀土的盐酸浸出率的影响。试验结果表明,稀土抛光粉加NaOH焙烧,NaOH用量与抛光粉质量比为0.18、焙烧温度450℃、焙烧时间2.5h最优条件下,稀土的盐酸浸出率平均高于98%。     

废弃稀土抛光粉回收再利用研究进展

稀土抛光粉具有优良的抛光性能,广泛应用于研磨抛光领域。抛光失效的稀土抛光粉铈含量较高,是一种具有经济价值的二次资源。本文分两个部分综述了废弃稀土抛光粉回收的研究进展,介绍了物理分离和化学分离回收废弃稀土抛光粉,概括了酸碱浸出回收技术中的主要影响因素。分析了化学沉淀和萃取法从废弃稀土抛光粉酸浸液回收铈,并对废弃稀土抛光粉回收再利用的发展方向进行了总结和展望。     

稀土抛光粉研磨试验研究

根据抛光粉抛光机理，以H—500型稀土抛光粉对玻璃进行研磨，研究了影响抛光粉抛光效果的主要因素确定了使用研磨机进行研磨检测的分析方法，同时也为指导稀土抛光粉产品的生产提供了理论依据。     

浅析稀土抛光粉产业的发展现状与前景

本文简要介绍了红粉与稀土抛光粉作为抛光材料的优缺点,比较深入地介绍了甘肃稀土集团有限责任公司稀土抛光粉产业的发展历史、产品规模、生产技术工艺特点,并对照分析了国内外其他稀土抛光粉生产企业的类似概况;针对不同抛光材料对稀土抛光粉质量要求的不同,从稀土抛光粉的分类、稀土抛光粉的技术特性等方面进行了详细探讨。通过对国内外生产稀土抛光粉企业的产量规模以及应用行业的发展方向的分析,对甘肃稀土集团有限责任公司稀土抛光粉产业提出了发展方向,展望了未来。     

球磨法制备铈基稀土抛光粉及其抛光性能研究

以碳酸镧铈和氟化铵为原料,采用球磨法制备前驱体氟碳酸稀土,焙烧后得稀土抛光粉,考察球磨时间、球料质量比及球磨速率对稀土抛光粉性能的影响。通过XRD、粒度分析对粉体的物相、粒径分布进行表征,用激光共聚焦显微镜观察抛光后玻璃的表面光洁度及粗糙度。结果表明,随着球磨时间、球料质量比及球磨速率的增大,稀土抛光粉的粒度呈先减小后增大的趋势;随球磨时间的延长,氧化铈主衍射峰强度增强,半高宽增大,粉体的晶粒尺寸减小;最佳球磨参数是球磨时间为3.5 h,球料质量比为10∶1,球磨速率为300 r/min。利用上述条件下制备的稀土抛光粉对Φ7 cm的K9玻璃进行抛光,其抛蚀量为1.5525 mg/min,与抛光前K9玻璃相比较,抛光后其表面粗糙度降低,在259μm×257μm范围内面粗糙度Sa降为0.025μm。     

以氯化稀土为原料制备稀土抛光粉的研究

以氯化稀为原料，研究了焙烧温度，焙烧时间、氟化、合成中间体等条件对制备稀土抛光粉性能的影响，并用粒度仪、ＳＥＭ、ＸＲＤ等分析手段对所得稀土抛光的性能的进行了表征。结果表明，以采用ＮＨ４）２Ｓ沉淀然后ＮａＯＨ转化，经过氟化，所得中间体在９００℃下焙烧３ｈ的制备工艺为宜。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

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。     

Results of treatment of cancer of the cardia

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.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

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)     

Effect of antibiotics of chemotaxis of human leukocytes

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.