CaO-SiO2-Al2O3-Fe2O3渣系脱磷行为

利用Factsage软件计算了Al2O3含量对CaO-SiO2-Al2O3-Fe2O3四元渣系熔点和黏度的影响,并通过实验研究了在1 400℃时,CaO-SiO2-Al2O3-Fe2O3四元渣系对高磷铁水脱磷行为的影响.结果表明:渣中Al2O3的质量分数在3％～6％之间时,随着A12O3含量的增加,渣系的熔化温度迅速降低,进一步增加渣中的A12O3含量,渣系的熔化温度逐渐增加;Al2O3对CaO-SiO2-Al2O3-Fe2O3渣系的黏度影响不大;渣中Al2O3的质量分数在3％～6％之间变化时,渣系脱磷能力变化不是很大,脱磷率维持在91％左右,进一步增加渣系中A12O3的量,脱磷率逐渐下降;Al2O3对脱磷率产生影响可能是其改变了炉渣中液相所占比例,进而影响磷从铁水中向液相渣的传质过程.     

高碳铁水脱磷的研究

太钢三脱站用CaO-SiO_2-Fe_2O_3-CaF_2渣系采用正交试验对高炉铁水做了脱磷试验,试验结果:各炉次的脱磷率为72.9%～94.6%,脱磷效果显著,No.10的脱磷率94.6%最高,各因素处于最优方案。铁水含碳量对铁水脱磷的影响并不大;渣的碱度对铁水脱磷的影响最大,高碱度是加强脱磷的必要条件,试验中R=3.5时脱磷效果最好;试验中1 350℃为最佳脱磷温度;w(Fe_2O_3)=10%～20%时,渣中增加Fe_2O_3含量对脱磷有利。     

超低磷钢冶炼试验研究

在实验室15 kg真空感应炉上研究Li2O、Na2O、K2O、CaF2添加试剂对铁水脱磷效果影响的基础上,在120t顶底复吹转炉上的脱磷期通过添加含Li2O、Na2O、K2O的锂云母矿进行了超低磷钢的生产试验。实验室研究结果表明,脱磷渣中添加15%Li2O时铁水中的磷可由0.109 4%降到0.003%的水平,脱磷率高达97.3%,脱磷开始0～5 min时间内表观脱磷速率达到0.021%/min;120 t转炉工业试验表明,在转炉入炉铁水[P]含量0.109 9%条件下,半钢[P]平均0.035%,半钢脱磷率平均68.1%,转炉终点[P]平均0.005 8%,最低0.003%,终点脱磷率平均94.8%,最高97.3%。     

返回转炉钢渣对铁水脱硅、脱磷的影响

在实验室条件下，模拟转炉钢渣的组成，利用CaO-SiO2-Fe2O3-MnO2-MgO-P2O5-Al2O3-CaF2系熔剂对铁水进行预处理，研究了转炉钢渣组成和渣中添加BaO对铁水脱硅和脱磷的影响。结果表明，通过控制转炉钢渣的组成可获得约75％的脱硅率和80％左右的脱磷率。脱硅过程伴随有铁水的回磷反应。随Fe2O3含量增加，回磷率提高，最大回磷率可达22．5％。此外，分析了铁水回磷原因和防止回磷的，发现使用添加BaO的转炉钢渣对脱硅后的铁水进行脱磷处理，当BaO添加量控制在15％－20％范围内时，可明显提高铁水的脱磷率。     

碱金属氧化物对转炉冶炼超低磷钢脱磷效果影响的工业试验

通过15 kg真空感应炉试验得出CaO基脱磷渣系中分别添加Li₂O、CaF₂、Na₂O、K₂O后均有明显的脱磷效果,其中Li₂O含量5%~10%时脱磷效果最佳。120 t顶底复吹转炉双渣操作的工业试验结果表明,脱磷前期在加31.46 kg/t石灰、3.70 kg/t白云石和0.70 kg/t烧结矿的基础上添加13.88 kg/t锂云母矿（/%:56.41SiO_2,3.80FeO,4.50Na₂O,4.17K₂O,3.18Li₂O）较未加锂云母矿的渣料（34.58 kg/t石灰,5.41 kg/t白云石,3.13 kg/t的烧结矿）转炉终点渣氧化性低,转炉半钢的脱磷率和磷平衡分配比的平均值分别是未加锂云母矿的1.67倍和2.81倍,转炉终点的脱磷率和磷平衡分配比的平均值是未加锂云母矿的1.02倍和1.47倍,与未加锂云母矿相比,转炉吹炼终点[P]可由0.009%~0.011%降低到0.005%~0.006%,能够满足超低磷钢生产要求。     

环保型高磷铁水预脱磷渣的脱磷性能研究

实验室条件下采用间接测量法,测定了CaF2系和B2O3系脱磷渣的磷分配.即首先测量磷在液态渣和固态铁间的分配比,再通过计算得到磷在液态渣和铁水之间分配比,同时根据渣系成分和光学碱度计算了磷容量.同时采用了扫描电镜、能谱分析与X射线衍射分析技术对脱磷渣进行了研究.实验结果表明,B2O3系预脱磷渣的磷容量远大于CaF2系预脱磷渣的磷容量,因此可以用B2O3全部替代CaF2作为助熔剂进行高磷铁水的预脱磷处理,2种渣系的磷分配均随渣中有效CaO含量的升高而升高.用B2O3作为助熔剂时,B2O3能与渣中高熔点物质2CaO·SiO2和3CaO·P2O5反应生成低熔点物质,从而起到助熔的作用.且w(B2O3)/w(CaO)比值为0.16时,磷分配比为最高值,即该渣脱磷能力最强.     

用石灰基渣系铁水同时脱磷、脱硫条件的研究

在1300℃研究了实验条件对石灰基渣系铁水同时脱磷、脱硫的影响。结果表明,炉衬耐火材质、载气、渣量和处理时间对脱磷、脱硫均有重要影响。MgO和MgO-11％Al_2O_3等碱性物质可作铁水预处理的耐火材料,空气和氧气都可作为喷吹渣剂的载气。短时处理和少渣均可实现一定程度的同时脱磷、脱硫。     

转炉渣中氧化磷对铁水脱磷影响的研究

以转炉渣为基础渣,在实验室测定了CaF2、P2O5质量分数变化对转炉渣熔点的影响。依据测定结果,利用转炉渣配制适合铁水脱磷要求的脱磷剂进行了铁水预脱磷实验,结合相关的转炉脱磷研究结果,分析了脱磷剂中P2O5对脱磷的影响,提出了对最终外排炉渣中的质量分数要求。在1350 ℃温度条件下,w（P2O5）＝166％转炉渣为基础的脱磷剂,对预脱硅处理后的铁水,脱磷剂加入10％时可取得约77％的脱磷率。脱磷剂中w（P2O5）＜75％时可取得60％以上的脱磷率。     

含制碱残渣的铁水脱磷复合剂的实验研究

研究了CaCl2、CaF2和碱度对脱磷的影响,使用制碱工业残渣配合萤石进行脱磷.结果表明:同时使用CaCl2和CaF2的脱磷效果要比单独使用其中一种助熔剂要好;使用碱渣代替CaCl2进行铁水脱磷,R=2,脱磷剂中添加质量分数为14.8 %的碱渣和5.99 %的CaF2对铁水脱磷时,脱磷率达到了86 %;含碱渣脱磷剂中添加BaCO3能显著降低熔点,提高脱磷率.     

预熔脱磷剂进行铁水脱磷的实验研究

在实验室条件下,以CaO-Fe2O3-CaF2为预熔脱磷剂的主要渣系,对预熔脱磷剂的配比关系、加入量、处理温度、初始铁水磷含量以及预熔渣粒度进行了研究.结果发现:在1 350℃条件下,w(CaO)/w(Fe2O3)约取1.0,在加入量为10%的预熔脱磷剂能将铁水中的磷降低到0.0079%,脱磷率为96.24%,且初始铁水磷含量以及预熔渣粒度对脱磷率影响不大.     

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。     

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。