转炉出钢挡渣改进实践

介绍了酒钢转炉改进出钢挡渣的实践，比较了挡渣塞和挡渣球的效果。挡渣塞的挡渣成功率为98．06％；比用挡渣球高34．42％；下渣量可控制在40mm以内，比用挡渣球减少30mm；平均回磷量控制在0．006％以内；硅的收得率提高2％～3％。改进挡渣方式后提高了出钢口和钢包的寿命，改善了LF炉精炼效果。     

滑板挡渣技术在包钢240t转炉上的应用

通过对转炉下渣过程的分析,系统对比了各挡渣方式的工作原理及其效果。滑板挡渣是基于大包滑动水口的控流系统,通过滑动滑板和固定滑板之间孔洞的位错运动,实现了对前期渣和后期渣有效的控制。滑板挡渣的成功率达到100%,转炉下渣量可以控制在60 mm左右,钢包回磷平均控制在0.000 5%以内,提高了钢水的洁净度,为生产成高附加值的钢种和降低生产成本奠定了良好的基础。     

150t转炉滑板挡渣工艺技术应用实践

介绍了转炉滑板挡渣工艺技术在安钢150 t转炉上的应用情况。应用表明,滑板挡渣技术挡渣成功率高,能有效控制下渣量,改善钢水纯净度,为开发高附加值品种钢和提高产品质量奠定了基础。     

50t转炉挡渣工艺优化

为了提高钢水质量,减少出钢过程下渣量、提高合金元素收得率,唐钢公司第二钢轧厂对转炉挡渣工艺进行了优化,改进了挡渣球结构、出钢口形状、挡渣球的加入方式。优化后,挡渣成功率提高约10%;出钢下渣量减少了30%以上;平均回磷量可控制在0.008%以内;硅锰合金吸收率提高了约7%,碳化硅收得率提高约15%,取得了很好的经济效益,且有利于提高精炼效果。     

滑板挡渣技术在石横特钢炼钢系统的应用实践

结合石横特钢生产条件,通过对滑板挡渣技术的引进、吸收、改进以及滑板挡渣技术的应用,对钢水质量、安全生产、成本、效益等的影响情况进行多种挡渣方式的对比,确定了根据生产钢种不同,选择合适的挡渣方式,达到在保证钢水质量的前提下,实现效益最大化。     

唐钢150t转炉滑板挡渣技术的应用与研究

介绍了转炉滑板挡渣工艺技术在唐钢150 t转炉上的应用情况.应用表明,滑板挡渣技术挡渣成功率高,提高了钢水纯净度.     

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。     

马钢300t转炉挡渣工艺的优化与改进

为减少出钢过程下渣、提高钢水质量及合金元素收得率,马鞍山钢铁股份有限公司第四钢轧总厂对300 t转炉原气动挡渣工艺进行了优化,采用了挡渣镖法和气动挡渣法相配合的方法。现挡渣镖法挡渣成功率达到98%,出钢下渣量减少了30%以上,平均回磷质量分数可控制在0.003%以下,同时提高了钢水收得率,改善了溅渣护炉和后续精炼效果,取得了较好的经济效益。     

悬挂挡渣塞在宣钢150t转炉生产中的应用

介绍了宣钢150 t转炉悬挂式挡渣装置的性能、主要参数、工作方式、事故处理,对比了挡渣球出钢挡渣和挡渣塞出钢挡渣的使用效果,最终确定了挡渣塞出钢挡渣工艺。生产实践表明,150 t转炉采用挡渣塞挡渣出钢,可有效控制出钢下渣量,减少钢水回磷,提高了钢水质量和合金收得率,实现了降本增效的目的。     

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。     

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。     

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.     

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.     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

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.