块矿对高炉炉料冶金性能的影响

通过研究高炉炉料的还原性、低温还原粉化性能和软熔滴落性能,探讨了巴西块矿对高炉炉料冶金性能的影响。结果表明:混合炉料中巴西块矿配比从5%增加到20%,炉料的低温还原粉化性能变差,但还原性能和软熔滴落性能得到改善,还原度指数增加了3.86%,滴落温度升高了40℃;当巴西块矿配比为10%时,软熔滴落性能达到最优,此时炉料的反应性指数最大。同时研究了单种炉料与混合炉料冶金性能的关系,2种炉料的还原性能和低温还原粉化性能具有叠加性,软熔滴落性能不具有叠加性,可通过反应性指数来判断炉料软熔滴落性能的改善情况。     

安钢原料冶金性能的研究

对安钢常用几种原料的冶金性能进行了分析,结果表明,孔隙率发达的高碱度烧结矿的还原度最高,其次是印度块矿和海南块矿,澳矿和南非块矿的还原度最低,但澳矿和南非块矿的低温还原粉化指数最低,高碱度烧结矿和澳矿及南非块矿的软化开始温度、矿石熔滴温度较高,但其矿石软化温度区间、矿石软熔温度区间均比加拿大球团和海南块矿要宽,澳矿和南非块矿的最大压差最小,综合炉料具有较好的冶金性能.     

几种高炉炉料冶金性能的对比研究

系统研究了我国炼铁生产中几种常用炉料的高温冶金性能.结果表明:孔隙率发达的高碱度烧结矿的还原度最高,其次是进口球团矿和进口块矿,国内球团矿的还原度最低;但进口球团矿和进口块矿的低温还原粉化指数高于高碱度烧结矿;无论国内还是进口球团矿,其软化开始温度、矿石熔滴温度,均低于高碱度烧结矿,但其矿石软化温度区间、矿石软熔温度区间均比高碱度烧结矿要窄;南非块矿的最大压差最大,高达5.669 kPa;在各种炉料中,虽然钒钛块矿的还原度最低,但低温还原粉化指数最高,其软熔区间最窄,是一种合适的护炉炉料.     

块矿配比对高炉配合炉料冶金性能影响规律研究

针对宝钢高炉所用的两种块矿——N块矿和F块矿,进行了包括热爆裂、低温还原粉化、还原性以及熔滴性能在内的一系列冶金性能试验研究,结果表明:N块矿的热爆裂性能要好于F块矿;当N块矿与F块矿的配比分别占到35％时,炉料的粉化RDI指数最好;当F块矿和N块矿分别与烧结矿混合后,炉料还原性能得到提升;在软熔性能试验中,当N块矿与烧结矿混合后其配比占到40％时,作为炉料透气性指数的特征值面积(S)最小,当F块矿与烧结矿混合后,相比单独F块矿而言,混合后的熔滴性能明显得到提升,并且F块矿的配比不宜超过 15％.     

安钢高炉块矿代替部分球团矿的研究

通过对安钢高炉入炉含铁炉料进行还原性、低温还原粉化及熔滴性能的试验研究,分析了各种入炉原料的冶金性能和块矿对炉料的冶金性能的影响,指出了在当前原料条件下安钢高炉炉料结构中提高块矿比例的可行性,为实际生产提供了理论依据。     

武钢高炉炉料冶金性能的研究

对武钢目前使用的不同炉料的冶金性能进行了研究,结果表明,武钢自产烧结矿铁分较稳定,低温还原粉化指标稍差,还原度却较好;块矿及球团矿低温还原粉化指标较好,还原度稍差;高碱度烧结矿的滴落温度明显高于酸性球团矿,而酸性球团矿的软化区间较高碱度烧结矿要窄。结合现场生产实际,合理的炉料结构为烧结矿65%、球团矿28%、块矿7%。     

含MgO熔剂性球团矿特点及生产实践

简要分析了酸性球团矿的理化优点和冶金性能缺陷。理论和实践证明，适当控制球团矿碱度和MgO含量，可以改善球团矿低温还原粉化率、还原度指数和软熔温度等冶金性能，有利于高炉顺行。     

高铝低硅块矿工艺矿物学及冶金性能研究

研究了一种产自非洲的高铝低硅块矿工艺矿物学和冶金性能,并与几种国内外典型块矿的冶金性能进行对比.结果表明:非洲块矿是一种由赤铁矿、针铁矿和三水铝石等矿物组成的高铝低硅高铁矿石,微孔发达,Al2O3含量较高.而就其含铁品位及脉石含量而言,要明显高于国内天然块矿,但低于其它进口块矿.非洲块矿具有良好的还原性(RI80!)和低温还原粉化性能(RDI+3.15 mm达86.69!)、较强的抗热爆裂性能(DI-6.3mm1!)及与其它进口块矿相近的高温软熔特性,可与国内低铝块矿、烧结矿、球团矿搭配使用来满足高炉渣型的要求,进而控制炼铁成本、扩大原料来源.     

安钢高炉炉料冶金性能研究

检测和研究了安钢炼铁生产中单一炉料及综合炉料的冶金性能.研究表明安钢自产高碱度烧结矿具有较好的还原性,但其低温还原粉化率却是最高的;酸性球团矿及块矿则有着较好的低温还原粉化指数及良好的熔滴性能,能够与高碱度烧结矿搭配形成合理的综合炉料结构,满足高炉冶炼要求.并提出了安钢综合炉料结构优化方向.     

铁矿石在含氢煤气中的还原行为研究

通过低温还原粉化、静态荷重还原和熔滴试验,模拟COREX还原温度和含氢煤气条件,研究了球团和块矿还原行为的差异.结果表明,与球团相比,块矿因其结构致密、孔隙率低,导致其低温还原粉化率差,还原前中期还原速率慢,还原过程中强度低,开始软化和熔融温度低,熔融区间窄,最大压差高.为解释现场使用块矿后压差上升、金属化率下降、易黏结等生产现象提供一定依据.     

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。     

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.     

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。     

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)     

Comparison of rates of infection of two methods of emergency ventricular drainage

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.     

浅析《野草》的版画特征

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".     

四辊破碎机车刀架的改造

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。     

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.