高还原势气氛下烧结矿低温还原粉化试验研究

在高还原势气氛下进行烧结矿的低温还原粉化试验,考察RDI＋6.3、RDI＋3.15和RDI-0.5的变化情况,分析不同还原气氛对烧结矿低温还原粉化的影响规律,探究烧结矿在氧气高炉上部的粉化行为.结果表明：烧结矿在氧气高炉气氛下的低温还原粉化率高于在传统高炉气氛下的低温还原粉化率,但其RDI＋3.15仍高达82.7%;随着还原气氛中CO和H2含量的提高,烧结矿的低温还原粉化率明显上升.     

烧结矿低温还原粉化影响因素研究进展

烧结矿入炉后,会在高炉上部发生低温还原粉化现象,严重时会影响高炉料柱透气性,破坏高炉顺行.为了改善烧结矿的这一性能,揭示烧结矿粉化机制,归纳了化学成分、添加物、微观结构、外部还原气氛和烧结工艺等对烧结矿低温还原粉化的影响,分析了改善烧结矿低温还原粉化性能的方法,为粉化机制研究、烧结配矿提供参考.     

烧结矿表面喷洒新一代CaCl2溶液效果分析

烧结矿低温还原粉化率高,困扰着高炉生产的正常进行.原喷洒CaCl2溶液后,虽低温还原粉化率有降低,但还原度也有所降低,不能满足高炉的需求.试验及工业生产证明喷洒新一代CaCl2活性溶液,可以显著降低烧结矿低温还原粉化率,同时对还原度没有影响,有利于强化高炉冶炼,提高利用系数,降低焦比.     

铁矿石烧结矿低温还原粉化机理研究

铁矿石烧结矿低温还原粉化机理研究［澳大利亚］Ｃ．Ｅ．ＬｏｏＮ．Ｊ．Ｂｒｉｓｔｏｗ关键词烧结矿，低温还原粉化，机理普遍认为，含铁原料在高炉上部的物理粉化对高炉操作及其稳定性有显著影响，６０年代引入“低温还原粉化”这一术语来说明这种现象。一般，用来检测含...     

宏阳烧结矿碱度与低温还原粉化指数关系的研究

烧结矿在高炉炉身上部会发生低温还原粉化现象.还原粉化指数(RDI)是烧结矿的一个重要冶金性能指标.通过实验探讨了宏阳公司烧结矿碱度与其还原粉化指数(RDI)间的关系,并用数学方法做了定性的分析和定量的推导.     

配加落地烧结矿对高炉冶炼影响

通过分析落地烧结矿粒度组成、低温还原粉化率、高温冶金性能、成分和性能稳定性变化,结合高炉大量配加落地烧结矿后炉况变化,采取针对性措施,保证高炉长期稳定顺行.     

烧结矿和球团矿吸附锌的规律及冶金性能变化的研究

模拟高炉中锌的还原及其蒸气在炉料吸附的过程,对入炉烧结矿、球团矿做了锌吸附及低温还原粉化的试验。试验结果表明:烧结矿和球团矿的吸附锌量随着温度的增加而提高,随着粒度的增大而减少;随着锌吸附量的增加,烧结矿和球团矿的低温还原粉化指标下降,这会影响到高炉的透气性,生产中应对入炉原料的锌含量做严格控制。     

喷洒卤化物 降低烧结矿粉化率试验研究

介绍了喷洒卤化物,降低烧结矿粉化率的机理.试验研究和生产实践表明, 成品烧结矿喷洒卤化物后,低温还原粉化率指标得到改善,高炉生产炉况顺行,产量增加,焦比下降.     

榆钢公司烧结矿低温还原粉化指数影响因素研究

结合烧结配料结构、烧结矿成分、工艺生产操作参数与低温还原粉化指数数据的对比分析,研究影响烧结低温还原粉化指数的影响因素.结果表明:烧结矿SiO2、CaO、FeO、MgO的升高有益于低温还原粉化指数的升高,另外生产过程工艺参数(点火温度、主管温度、主管负压、煤气质量)对烧结低温还原粉化指数也有较大影响.     

基于不同炼铁工艺的铁矿石低温还原粉化特征

 为改善铁矿石在炉内的低温还原粉化性能以适应多样的炼铁生产条件,以炼铁生产常用的烧结矿、球团矿以及块矿为研究对象,通过控制还原气体成分和温度的方式,考察并比较了不同种类铁矿石在高炉炼铁工艺和COREX非高炉炼铁工艺2种煤气条件下的低温还原粉化行为。试验结果表明,相同的还原气氛和温度条件下,烧结矿、球团矿以及块矿的还原粉化形式、程度有较大差异,而各类铁矿石对煤气性质、温度变化的敏感性也各不相同。这对更为全面地考察和评价不同类型铁矿石的低温还原粉化特征,进而改善铁矿石冶金性能和优化炼铁工艺参数具有一定的实用性和参考价值。     

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.     

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.     

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。