碱金属对高炉生产的影响

随着高炉冶炼技术的进步,碱金属及锌等对高炉的危害越来越得到重视。碱金属在高炉内的循环富集,给高炉带来一系列不利影响。承钢近年来对高炉碱金属元素进行调查,对其炉衬侵蚀机理进行分析,结合实际生产情况提出了防止高炉碱害的措施,以减少碱金属元素危害,确保高炉长期顺行,延长高炉寿命,达到更好的经济技术指标。     

高炉内氯元素反应行为的热力学分析

利用热力学软件(HSC Chemistry 6.0)研究氯元素在高炉内可能存在的化学反应,分析氯元素在高炉内不同温度区间发生的主要化学反应,得到无碱金属、少量碱金属和大量碱金属存在三种冶炼条件下高炉内氯元素的反应行为。结果表明,在无碱金属存在时,由原燃料带入高炉内的氯多生成HCl气体;在含少量碱金属时,氯以HCl气体和碱金属氯化物的形式存在;在高炉内碱金属含量较高时,氯主要以碱金属氯化物形式存在。上述含氯产物随高炉煤气上升,部分吸附在含铁炉料和焦炭上并随之下降,部分随高炉煤气排出,少量氯元素被炉渣吸收,从而影响高炉冶炼过程。。     

韶钢6号高炉碱金属的危害及其控制

介绍近一年来韶钢6号高炉碱金属元素调查情况,对其炉衬侵蚀机理进行分析,结合实际生产情况提出了防止高炉碱害的措施,以减少碱金属元素危害,确保高炉长期顺行,延长高炉寿命,达到更好的经济技术指标.     

有害元素对攀钢高炉的危害分析

 分析了锌和碱金属等有害元素在炉内行为和攀钢高炉结瘤物成分及有害元素走向,揭示了有害元素对攀钢钒钛磁铁矿高炉冶炼产生的危害,锌对攀钢高炉已经产生危害,而碱金属目前未对高炉产生不良影响,但随着炉料结构的变化不容忽视,并提出了相应的应对措施。     

邯钢高炉有害元素的分布及控制

重点对邯钢高炉有害元素的分布情况进行了分析,认为邯钢高炉碱金属负荷较高,烧结矿、球团矿、焦炭是高炉碱金属的主要来源。针对邯钢高炉生产现状,在碱金属的控制、锌元素的控制和氯元素的控制等方面采取了一些技术措施,使得高炉碱金属负荷由3.80 kg/t下降至2.92 kg/t,锌负荷由320 g/t下降至236 g/t,燃料比降低7.4kg/t,炉况顺行显著改善,保证了高炉顺行。     

碱金属及锌对武钢高炉炉身侵蚀的研究

本文通过武钢二、三、四高炉的破损调研,了解了有害元素碱金属、锌对高炉炉衬侵蚀的影响,并借助于试验室的模拟试验提出了碱金属、锌对高炉粘土材质的侵蚀机理。     

马钢大型高炉有害元素负荷及平衡分析

对马钢大型高炉有害元素(碱金属、锌、TiO_2、Al_2O_3)的收入、支出情况进行跟踪和计算,分析研究了烧结矿、球团矿及高炉原燃料中各有害元素的主要来源、所占比例、变化趋势、富集情况以及进出平衡情况。结果表明:马钢大型高炉Zn、碱金属负荷均在控制要求范围内,收支基本平衡,但有害元素负荷月平均值波动较大;烧结原料中混匀矿、OG泥以及球团原料中自产精1是高炉有害元素负荷的主要来源。提出了控制马钢大型高炉有害元素负荷的建议和措施。     

榆钢高炉有害元素现状调查与应对措施

通过对榆钢高炉有害元素现状调查,认为榆钢高炉人炉有害元素超标且大量富集的主要原因是,没有对入炉原燃料的有害元素(主要是碱金属和锌)进行有效控制。针对有害元素对高炉生产操作的影响,提出了应对措施。     

朝阳钢铁高炉有害元素分析及控制

针对鞍钢集团朝阳钢铁有限公司2600 m3高炉有害元素对高炉的危害情况,从2013年开始定期对有害元素的入炉情况进行分析,根据分析结果制定了烧结矿有害元素的控制标准,并采取相应措施有计划地控制高炉碱金属负荷、Zn负荷,对高炉的长周期稳定顺行起到了决定性作用。     

1~#1080m~3高炉排碱操作研究

根据莱钢1#1 080 m~3高炉Zn元素及碱金属富集炉况表现,分析引起Zn元素及碱金属富集的原因,探索高炉排碱操作期间的高炉操作制度,通过对排碱过程进行跟踪,对排碱结果进行归纳总结得出,在保证渣铁热量的前提下,降低炉渣碱度、控制合适炉温,有利于提高排碱效率。     

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.