闸阀挡渣工艺技术在安钢150t转炉上的应用

为满足冶炼超低磷钢等高附加值钢种的需要,安钢第二炼轧厂3号150 t转炉引进了闸阀挡渣工艺技术。文章介绍了该挡渣系统的设备、工艺、使用情况、存在的问题及应对措施等。实践表明,该挡渣系统运行稳定,基本达到了设计的功能要求,为今后冶炼高附加值品种钢奠定了基础。     

气动挡渣系统在本钢炼钢厂的应用

为提高钢水纯净度，本钢炼钢厂1号转炉采用了由VAI公司引进的气动挡渣技术，介绍了该系统的工艺、功能技术指标及使用中出现的问题及解决方法。该系统的设计功能已基本达到，为冶炼高质量、高附加值品种钢奠定了基础。     

H08A焊条钢的开发

河北敬业集团从市场需求和集团的实际情况出发,开发了H08A焊条钢。介绍了H08A焊条钢冶炼的主要设备、工艺流程,针对该钢低碳低硅的特点,转炉冶炼时尽量一次拉碳出钢、一次拉碳多倒渣,做到温度与化学成分双命中;采用挡渣塞和挡渣锥挡渣出钢,加铝镁钙、中碳锰铁等合金脱氧、去除夹杂物;钢包到站后,在包底分别于软吹氩和钙处理后测温、取样,控制钢水的化学成分达到目标值;全程保护浇铸,防止钢水出现二次氧化。从试生产检测试样结果后,H08A焊条钢连铸坯未发现裂纹和气泡,连浇炉次由3～4炉上升到目前的15炉以上,铸坯成品合格率达到98.3%。     

120t氧气顶吹转炉挡渣球试验简况

转炉在冶炼硅钢、不锈钢、高强度钢或者进行炉外精炼时,使用挡渣技术是不可缺少的.它有提高合金效率、避免出钢过程回磷、减少钢渣对钢液的污染、提高钢液的纯度、提高钢包寿命和提高炉外精炼效果等作用.目前的挡渣方法较多,挡一次渣法有的用挡渣帽,有的用代渣槽的钢包车.挡二次渣法有挡渣球,挡渣塞,挡渣包,还有采用U型出钢口.但目前国内外较广泛应用的是挡渣球和挡渣塞.因为它们不需要对炉子进行改造和增加复杂的设备,只需要一个简单的投球设备.攀钢炼钢厂未进行一次挡     

300t转炉闸阀式挡渣技术的应用

从挡渣球挡渣法、气动挡渣法到挡渣塞挡渣法的发展状况,评述了这几种挡渣技术在实际转炉挡渣过程中的原理、特点和效果。介绍了宝山钢铁股份公司采用新的挡渣工艺——转炉闸阀式挡渣技术的生产实际情况,应用结果表明,闸阀式挡渣效率大于95%。     

高碳钢82B转炉脱磷技术的研究

冶炼82B主要从入炉废钢、高碱度渣、双渣法、温度控制、高拉补吹法、挡渣出钢、避渣操作、钝化炉渣等方法控制钢中磷含量,本文主要通过论述影响转炉脱磷的各种因素,阐述82B冶炼过程脱磷的各个控制环节.     

转炉滑板挡渣出钢工艺的实践应用

本文介绍了福建三钢闽光股份有责任公司炼钢厂在2座l00t和1座120t转炉上采用滑板挡渣出钢工艺代替原有的挡渣塞挡渣出钢工艺的情况。实践表明,采用滑板挡渣出钢时,滑板自动关闭成功率达100%,自动下渣检测成功率达98%以上。转炉实现了少渣出钢,为冶炼高品质钢种提供了技术保障,品种得于拓展。     

滑板挡渣技术对转炉成本的影响

随着滑板挡渣技术在转炉炼钢工艺中优势的凸显,被越来越多的钢铁企业采用,尤其是品种比较高的钢铁企业,该技术让生产高附加值品种钢时,对P、S等有害元素和夹杂物控制的苛刻要求变得可控.滑板挡渣技术优势明显,但转炉耐材成本的增加让钢铁企业利润空间缩小.本文通过宣钢150 t转炉滑板挡渣技术投入前后冶炼数据的对比,详细分析滑板挡...     

基于PLC自动控制和红外下渣检测的滑板挡渣技术应用

通过对转炉出钢过程中前期渣、中期渣和后期渣的分析,系统对比了挡渣球、挡渣塞、气动挡渣和滑板挡渣等挡渣方式的挡渣效果。滑板挡渣通过PLC自动控制系统采集转炉倾动角度,同时利用红外下渣检测判断下渣量。根据挡渣工艺要求,滑动水口的全开或全闭可在0.5 s内自动完成,实现出钢过程中前期渣、中期渣和后期渣的最有效阻挡。与其他挡渣方法相比,滑板的挡渣成功率达到100%,转炉出钢下渣量控制在50 mm,回磷稳定控制在0.002%以下,降低了钢水氧化性,减少了合金消耗,提高了转炉成分命中率。     

梅钢转炉挡渣技术生产实践

介绍了上海梅山钢铁股份有限公司炼钢厂150 t转炉挡渣工艺。使用挡渣帽和挡渣塞双挡渣并配合下渣检测仪联合使用模式,可以控制钢水回磷质量分数在5×10-6左右;提高出钢口使用寿命,冶炼IF、SPHC和H-235P钢时,出钢口平均使用寿命可以分别达到98、110和117炉;减少每炉下渣量约100 kg,提高了钢水洁净度。     

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.     

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.     

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)