宝钢全量铁水预处理的实践

结合宝钢铁水预脱硫的生产实践,分析了宝钢现行6类铁水脱硫模式的生产效果、粉剂消耗、生产工艺组织及经济效益情况.结果表明,铁水脱硫模式的选择必须充分考虑原料条件、工艺总图布置、铁钢对应程度、处理目标要求、处理综合成本等要素.宝钢目前采用的铁水包脱硫模式,具有处理时间短、粉剂消耗低、处理后硫低、综合处理成本最优特点,是值得推广和普遍采用的高效脱硫技术.     

复合喷吹法铁水脱硫工艺与设备分析

介绍复合喷吹铁水脱硫在冶金工业中的重要作用,重点讨论其工艺流程和设备的设计合理性、实用性和可靠性。采用复合喷吹脱硫的工艺,具有处理时间短、粉剂消耗低、处理后硫含量低、综合处理成本最优特点,是值得推广和普遍采用的高效脱硫技术。     

铁水包喷吹Mg+CaO粉剂脱硫技术

分析了宝山钢铁股份有限公司采用TDS(Torpedo Car Desulphurization)、PTC(Hot Metal Pre-treatment Center)和铁水包单枪、双枪喷Mg+CaO脱硫模式的生产情况.结果表明,采用铁水包喷吹Mg+CaO脱硫在喷吹时间、脱硫效果、粉剂消耗、生产组织及经济效益等方面明显优于混铁车喷吹脱硫.脱硫时间可缩短50%以上,终点硫质量分数可达到0.001%～0.003%,粉剂总耗量仅为CaC2基粉剂耗量的50%、CaO基粉剂耗量的20%,综合成本比TDS或PTC混铁车脱硫低18%～30%.铁水罐双枪喷Mg+CaO脱硫模式的效果最好.     

铁水双枪脱硫技术应用研究

铁水脱硫技术是提高钢材质量、生产高附加值产品的主要技术保证。为达到产品要求,包钢薄板厂对现有脱硫工艺进行改造,改造后采用了双抢双工位、CaO＋Mg复合喷吹脱硫模式。具有处理时间短、粉剂消耗低、处理后硫低、综合处理成本最优的特点,脱硫率和脱硫效率得到很大提高,满足了生产工艺要求。     

Ca-Mg系粉剂复合喷吹脱硫技术在鞍钢的应用

论述了Ca-Mg系粉剂复合喷吹铁水脱硫的技术特点及在鞍钢的应用,包括铁水脱硫方法的选择、脱硫粉剂的选择、脱硫扒渣的控制及冶金效果等.     

Ca-Mg系粉剂复合喷吹脱硫技术在鞍钢的应用

论述了Ca-Mg系粉剂复合喷吹铁水脱硫的技术特点及在鞍钢的应用,包括铁水脱硫方法的选择、脱硫粉剂的选择、脱硫扒渣的控制及冶金效果等.     

喷吹法和KR法铁水脱硫技术在西昌钢钒的研究及应用

本文以笔者参与的西昌钢钒新建Ⅲ部铁水脱硫装置项目为背景，通过对KR和喷吹法对含钒铁水脱硫工艺的分析比较，结合西昌钢钒含钒铁水硫含量高达0.079%,品种钢脱硫目标值低至0.005%的特点，以及西昌钢钒产品结构要求，西昌钢钒新建Ⅲ部铁水脱硫装置最终采用喷吹法。同时根据脱硫反应热力学计算分析，确定了西昌钢钒针对含钒铁水预处理工序选择合适的脱硫粉剂，通过生产实践表明，在复合喷吹作业过程中对降低铁水脱硫成本，提高脱硫效率，尤其是生产品种钢时效果较明显。因此，本文研究计算结果可以为确定脱硫工艺及装备设计选型提供理论计算依据，对于工程设计及应用领域具有一定的指导意义。     

复合旋转喷吹铁水脱硫预处理工艺研究与应用

鞍钢股份有限公司炼钢总厂结合复合喷吹脱硫和KR搅拌脱硫两种工艺的优势,研制了复合旋转喷吹铁水脱硫预处理工艺,并且增加了脱硫喷枪的喷吹孔数量,调整了喷枪旋转转速,优化了喷吹孔位置分布以及喷吹孔径尺寸等参数。实践表明,采用复合旋转喷吹铁水脱硫预处理工艺可以降低脱硫粉剂消耗约30%,脱硫率提高了4.25%。     

镁基粉剂脱硫剂铁水脱硫技术

本文论述了镁基粉剂脱硫剂铁水脱硫的反应特点与喷吹方式以及该技术对脱硫处理工序的经济效益，其复合喷吹技术是铁水脱硫的一项可靠，灵活，操作成本较低的实用先进技术。     

影响CaO基复合脱硫剂脱硫效率的因素分析

从脱硫原理上分析脱硫的影响因素,分析了石灰质量、粉剂粒度、铁水装入量、铁水温度及铁水中钛含量等对脱硫的影响.在国内某钢厂使用业绩表明:脱硫粉剂中ω(CaO)达到90％、粉剂粒度小于0.15 mm比例占96％时,脱硫效率达95.1％,粉剂消耗从17 kg/t降低至13.5 kg/t.     

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.