LF精炼过程中顶渣硫容量、分配比和脱硫率的确定

为了确定LF精炼过程中顶渣的脱硫能力，通过对光学碱度的计算，得出了1627℃时CaO-SiO2-Al2O3-MgO(5％)渣系组成与硫容量的关系图。由硫容量、氧活度(与钢中溶解铝平衡值)计算出硫分配比，绘出了不同硫分配比时脱硫率与渣量的关系图，提出了一个由已知渣组成、渣量、钢液氧活度和硫含量来计算LF精炼过程中最大脱硫率的简便方法。     

LF 炉渣循环利用脱硫效果研究

本文对LF炉热态渣循环利用后脱硫效果进行试验,试验分两种不同操作工艺,一种是在循环渣中添加石灰,另一种是不添加石灰。通过比较热态渣循环利用后LF精炼出站钢水硫含量,化学分析终渣成分以及计算硫容量和硫分配比,对热态渣循环利用的脱硫效果进行了综合评价。     

LF炉渣循环利用脱硫效果试验研究

对LF炉热态渣料循环利用后脱硫效果展开试验,试验过程分循环渣中添加石灰和不添加石灰两部分进行。通过比较渣料循环后LF精炼出站钢水中硫的质量分数,取终渣样进行化学分析及计算硫容量和硫分配比,做出了对渣料循环脱硫效果的综合判断。     

超低碳弱脱氧钢炉渣硫容量和硫分配比探讨

首先简述了现有炉渣硫容量的预测模型,包括光学碱度模型和皇家工学院(kungliga tekniska h9gskolan,简称KTH)模型等,同时提出利用FactSage软件计算炉渣的硫容量,并与前两种模型进行对比。结果表明,这3种模型都能较好地预测RH顶渣的硫容量;利用FactSage软件对超低碳钢钢-渣间的硫分配比进行计算,计算结果与检测结果非常接近。因此,FactSage软件可以用来预测超低碳弱脱氧钢RH(Ruhrstahl-Hereaeus)顶渣的硫容量和钢-渣间的硫分配比,并指导生产实践。同时指出,对于超低碳钢的生产,增大RH顶渣中w(CaO)/w(Al_2O_3)比值,降低渣中(FeO+MnO)和SiO_2的质量分数,可以将钢液中硫质量分数控制在较低水平。     

高级别管线钢超低硫控制研究

 利用光学碱度计算了1873 K时CaO SiO2 Al2O3 MgO(10%)四元精炼渣系的硫容量,从理论上分析了精炼高级别管线钢超低硫控制的工艺条件,绘制出精炼渣硫容量、渣中硫、钢中溶解氧与钢中硫的关系图。分析了某钢厂LF VD高级别管线钢生产工艺,LF1（LF炉精炼初期）、LF2（LF炉精炼末期）和VD精炼渣的氧化能力w（（MnO+FeO））分别为11.92%、2.00%和1.1０%,精炼渣碱度分别为3.195、6.250和7.600,精炼渣的曼内斯曼指数M（R/w(Al2O3）)分别为0.09、0.17和0.18,精炼渣硫容量CS′分别为0.010、0.022和0.023。钢中硫的质量分数从LF1的80×10-6,降低到LF2的（20～30）×10-6 ,并稳定在VD末期的20×10-6以下,与理论计算相符。     

IMCT模型和KTH模型在S50C钢脱硫实践中的应用

脱硫是LF精炼的主要任务之一,基于酒钢S50C中高碳钢的开发,对S50C钢LF精炼过程硫容量、硫分配比的计算方法进行了研究。主要利用IMCT模型和KTH模型对LF精炼渣的渣-钢硫分配比进行计算,并通过工业试验对计算结果进行验证。结果表明,IMCT模型和KTH模型的计算值均能表现从LF到站到LF出站的过程中脱硫反应向着平衡的方向发展,但是KTH模型的计算结果更为准确。因此,对IMCT模型进行了修正,修正后的模型也能较为准确地计算出LF精炼末期硫分配比。最后计算了CaF_2含量对硫容量的影响,结果显示CaF_2含量对平衡硫容量的影响较小。     

钢水精炼配渣模型

考虑钢包带渣量和成分的变化,对CaO-SiO2-MgO-Al2O3(-CaF2)精炼渣系建立配渣模型.模型根据是否用铝还原钢包带渣的SiO2,可分两种情况通过化学计量计算达到目标渣成分时精炼渣各成分加入量.     

IMCT模型和KTH模型在S50C钢脱硫实践中的应用

摘要：脱硫是LF精炼的主要任务之一，基于酒钢S50C中高碳钢的开发，对S50C钢LF精炼过程硫容量、硫分配比的计算方法进行了研究。主要利用IMCT模型和KTH模型对LF精炼渣的渣 钢硫分配比进行计算，并通过工业试验对计算结果进行验证。结果表明，IMCT模型和KTH模型的计算值均能表现从LF到站到LF出站的过程中脱硫反应向着平衡的方向发展，但是KTH模型的计算结果更为准确。因此，对IMCT模型进行了修正，修正后的模型也能较为准确地计算出LF精炼末期硫分配比。最后计算了CaF2含量对硫容量的影响，结果显示CaF2含量对平衡硫容量的影响较小。     

硫容量模型和在五元渣系CaO SiO2 MgO Al2O3 FetO中的应用

 硫容量和硫平衡分配比是衡量炼钢过程中渣系脱硫能力的重要指标。通过光学碱度模型和KTH模型计算了五元渣系CaO SiO2 MgO Al2O3 FetO的硫容量,并与文献的实验测定值进行了比较。结果表明用KTH模型计算的硫容量比用光学碱度模型计算的硫容量更接近实验值,因此KTH模型可用来预测不同组元渣系的硫容量。还详细研究了硫容量和硫平衡分配比的影响因素,结果表明硫容量随炉渣碱度和温度的增加而增加,硫平衡分配比随着钢液中铝、碳、硅含量的增加而增加。     

天钢LF炉钢水精炼配渣模型的建立

根据转炉下渣的重量和成分含量,以(12CaO·7Al_2O_3+5%SiO_2)作为LF炉精炼基础渣为目标,建立了适用于任意配比的CaO-SiO_2-Al_2O_3-MgO(-CaF_2)精炼渣配渣模型。LF精炼配渣模型可以根据采用或者不采用铝来还原转炉下渣中含有的SiO_2组分的两种情况,通过计算得到精炼渣的各组分含量。配渣模型采用Microsoft office 2010软件中的Excel在PC计算机上进行计算。计算过程中,在求解方程组时,采取的解法为GAUSS消元法。     

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。