球团矿化学成分控制现状及展望

 综述了近年来国内外高炉球团矿使用比例的现状,分析了球团矿化学成分控制以及不同化学成分对球团矿冶金性能的影响。分析表明,多数国内钢铁企业球团矿TFe的质量分数较低,SiO₂质量分数较高且差异较大。不同企业球团矿Al₂O₃和FeO的质量分数不同。应控制球团矿中SiO₂、Al₂O₃和FeO的质量分数。随着CaO和MgO质量分数的提高,球团矿抗压强度均降低。适宜质量分数的CaO有利于改善球团矿的还原膨胀性能。随着MgO质量分数的提高,球团矿的还原膨胀性和软熔滴落性能均变好。高炉炉料结构采用低MgO烧结矿、酸性球团矿和镁质球团相结合,可以充分发挥球团矿的冶炼优势,实现球团矿入炉比例的提高。MgO和CaO在球团矿焙烧过程中的作用机理,以及如何控制镁质球团中的液相含量以提高球团矿的抗压强度等需要进一步深入研究。     

生产高质量的球团矿

通过中外球团矿的质量对比,找出了我国目前球团矿质量的差距,并分析了在球团矿生产中的各种影响因素,指出了生产高质量球团矿的必要性和改进方向。     

球团矿质量分层综合评价方法研究

球团矿是强化高炉炼铁必不可少的优质炉料,但评价球团矿质量的指标很多,目前尚缺乏对球团矿质量综合评价的方法,导致在优化高炉炉料结构时对不同性能球团矿的选择上缺乏科学依据。本文在系统分析宝钢高炉用球团矿的基本物化性能和冶金性能的基础上,通过建立球团矿质量指标分层综合评价模型,对球团矿的质量进行了综合评价,综合评价指数计算结果与宝钢实际生产效果吻合,为高炉筛选入炉球团矿提供了一种科学的方法。     

宣钢球团矿质量攻关

2015年1月~6月,球团矿质量出现阶段性波动,FeO含量升高,还原性降低,球团矿整体质量变差。为改善球团矿质量,宣钢从原料结构优化、工艺操作、设备检修和维护等方面采取改进措施,取得了明显效果,球团矿质量大幅度改善,为后续球团生产提供了参考。     

生产操作参数对球团矿质量的影响(英文)

球团矿质量取决于生产操作参数和原料的理化性能。可以预期,特别是原料性能、混合比例、生产设备参数和焙烧过程中热处理条件的变化将导致成品球团矿特性的改变。在炼铁单元中球团矿质量起着决定性的影响,炼铁单元要提高球团矿质量,需要基本了解工厂操作条件对于球团矿质量的影响。考虑到这一点,对1号球团厂数据进行了分析。从数据分析中发现球团矿质量主要受原料氧化铝含量、生球碳和水分含量、成品球团矿FeO含量、烧透温度和焙烧机给料速率及料层高度的影响。     

提高8m~2竖炉球团矿产量和质量的实践

为了提高8 m2竖炉球团矿产量和质量,采取了改造干燥床篦条、调整优化干燥床、提高生球质量和开发应用竖炉二冷系统等措施,使球团矿产能提高了51.49%,稳定了球团矿质量,降低了能源消耗。     

球团矿中膨润土的检验方法与用量

介绍了膨润土各项检测项目及方法,分析了膨润土各项指标对球团矿质量的影响;通过对球团矿中膨润土检测分析的全过程的质量控制,使作业标准化,调节膨润土的用量,使球团矿质量得到更好的控制。     

不同质量分数MgO对球团质量的影响

通过某球团厂现有生产所用的矿粉配矿得到不同MgO质量分数的球团矿,运用一系列的试验方案和检测手段找出球团矿最优的抗压强度和冶金性能下的MgO质量分数,并探究了不同MgO质量分数对其球团矿的抗压强度和冶金性能影响的规律。结果表明,MgO质量分数为0.5%时,所生产的球团矿抗压强度最强,随着MgO质量分数的增加,球团矿的抗压强度下降。MgO质量分数为0.5%时,还原度最高,达到了75.59%,随着MgO质量分数的增加,球团矿的还原度下降。MgO质量分数为1%时,低温还原粉化率最大,随着MgO质量分数的增加,球团矿的低温还原粉化率先升高后降低;MgO质量分数为1%时,软化开始温度最高,熔滴温度区间最窄,熔滴性最好,随着MgO质量分数的增加,球团矿的软化开始温度先上升后下降,熔滴温度区间先变窄后变宽。     

峨口铁矿竖炉球团系统的影响因素分析及技术对策

结合峨口铁矿采用自产铁放制取球团矿的工艺流程,系统地分析了影响球团矿产质量的各种因素,介绍了针对这些影响因素所进行的技术改进,以及球团矿产质量得到提高的情况。     

碱性含镁球团矿的应用及合理炉料结构研究

使用碱性含镁球团矿可提高氧化球团矿质量,进而改善高炉生产指标.从理论上分析了碱性含镁球团矿的冶金性能,并探讨了包钢高炉炼铁合理的炉料结构,研究结果表明:碱性含镁球团矿中合理的MgO的质量分数为1.8%,烧结矿中合理的MgO的质量分数为1.8%、碱度为1.7.依据包钢现有的资源条件分析了通过添加轻烧白云石细磨粉,制作含镁碱性球团的可行性.     

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)     

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.