承钢钒钛磁铁矿烧结配矿正交优化研究

目前承钢烧结生产主要以钒钛磁铁精矿为含铁物料,但其成品烧结矿强度低、低温还原粉化严重.针对这一问题,研究了承钢烧结原料烧结性能、烧结过程、烧结矿性能,得出海砂配比为0,黑山钒粉配比为14 %,普通精粉配比为20 %,钢渣配比为1%时为最优配矿,为承钢提高烧结矿质量提供了理论依据.     

印尼海砂对烧结矿产质量影响的研究

研究了印尼海砂的物理化学性质,并考察了印尼海砂配比对杭钢烧结矿产质量及其冶金性能的影响。结果表明:海砂配比在一定范围内,可以提高烧结矿冷强度和成品率,利用系数和固体消耗变化不大。随着印尼海砂配比增加,烧结矿还原性有所增加,但低温还原粉化指数降低幅度大。综合考虑,在目前的原料基础上,印尼海砂配比控制在5%左右为宜。     

高硫精矿配比对烧结矿性能的影响

 相比进口富矿粉,精矿品位较高,可广泛应用于铁矿石烧结工序。为了探究高硫精矿对烧结矿产质量的影响以及精矿中硫元素对烧结过程的影响,利用烧结杯试验装置进行了高硫精矿配比在25%~45%范围内的烧结杯试验。并通过微观结构、技术指标及冶金性能等方面表征了高硫精矿配比对烧结矿性能的影响。试验结果表明,精矿配比为25%时,烧结矿还原的界面反应条件较差,硅酸盐相阻碍了还原气体的扩散,致使烧结矿还原度为77.80%,软化开始温度为1 200 ℃,软熔带透气性能恶化。精矿配比为30%时,烧结利用系数提升至1.19 t/(m2·h)、垂直烧结速度达到22.22 mm/min。精矿配比为40%时,有效改善了烧结矿还原性能,恶化了低温还原粉化性能。精矿配比为45%时,烧结利用系数最高,为1.20 t/(m2·h),还原性能和低温还原粉化性能适宜。整体而言,在试验范围内,适当增加高硫精矿配比有利于提升烧结矿的还原性能和荷重软化熔滴性能,但精矿配比为45%时烧结矿的熔滴S特性值为281.02 kPa·℃,透气性能恶化。烧结烟气方面,精矿配比为40%时,烧结烟气的CO₂和NO_x含量较高,烧结过程氧化性气氛较强,降低了烧结矿中铁橄榄石等低还原性矿物含量,恶化了低温还原性能。烟气分析结果表明,高硫精矿烧结时硫元素基本都进入烧结烟气中,并未恶化烧结矿性能。     

配加新西兰海砂生产实践

依据实验室烧结杯试验结果,确定了新西兰海砂在钒钛矿烧结生产中的合适配比为10%~15%。在烧结机配加后,通过改进松料器、利用蒸汽预热、控制适宜的烧结矿碱度强化混合料成球增强料层透气性等措施,保证了烧结矿产品质量,转鼓强度满足了高炉生产需要。     

酒钢转炉钢渣用于烧结的试验研究

为实现钢渣多途径利用,达到减少资源浪费和环境污染的目的。根据酒钢烧结原料及钢渣特性在实验室进行不同钢渣配比的烧结杯实验,并对烧结矿的冶金性能进行了测定研究。结果表明:钢渣对烧结温度、垂直烧结速度和烧结利用系数有明显的改善作用;随着钢渣配比的增加,烧结矿成品率和转鼓强度均出现了先增大后下降的趋势;烧结矿的还原率随钢渣配比的增加呈现不同程度的下降,而烧结矿的粉化性能得到大大改善;钢渣加入量每增加1%,烧结矿TFe将降低0.3%,P含量将升高0.00375%。     

澳矿粉配比对含钒烧结过程和烧结矿冶金性能的影响

基于承钢烧结现场条件,研究了澳矿粉配比对含钒烧结过程和烧结矿冶金性能的影响.结果表明:在试验条件下,适当增加原料中澳矿粉的配比,烧结矿中的w(FeO)和w(TiO2)降低,而w(SiO2)和w(Al2O3)则升高,赤铁矿和玻璃质含量增加,烧结料层的透气性得到了改善.当澳矿粉配比在33%以内增加时,烧结成品率、烧结矿冷态转鼓指数和低温还原粉化性能以及烧结矿的产量都有所改善.综合考虑澳矿粉配比对烧结矿产量、质量及高炉冶炼过程的影响,应将澳矿粉在烧结原料中的配比提高到33%左右.     

固体燃料种类和配比对钒钛磁铁矿烧结过程及烧结矿性能的影响

结合承钢烧结现场原料条件,研究了固体燃料种类和配比对钒钛磁铁矿烧结过程及烧结矿冶金性能的影响.结果表明:当白煤代替焦粉作为烧结用固体燃料后,烧结矿中的磁铁矿、硅酸盐和玻璃质含量降低,而赤铁矿和铁酸钙含量升高,有利于改善烧结矿的冷态机械强度和低温还原粉化性能.承钢烧结的固体燃料配比不宜太高,当焦粉作为承钢烧结的固体燃料时,其配比应控制在5%左右;当白煤作为承钢烧结的固体燃料时,其配比应控制在5.5%至6%之间比较适宜.综合考虑,承钢烧结应采用白煤作为固体燃料,而烧结矿的FeO含量控制在7%左右为宜.     

360 m2烧结机提质增产工艺参数优化研究

基于360 m2烧结机原燃料条件和生产需求，探究碱度、燃料结构、烧结生石灰配比等工艺参数对烧结经济技术指标的影响。结果表明，碱度升高对烧结经济技术指标及还原性、还原粉化性能有利，但不宜使用高于5.71%的石灰石配比来提高碱度；相对无烟煤粉，焦粉烧结时对烧结产质量指标及冶金性能有更为显著的优势；生石灰配比增加对烧结经济技术指标的提高有着最为显著的作用；对于烧结矿粒度组成，碱度升高、高比例焦粉烧结、高比例生石灰都有利于大粒度烧结矿比例的提高，减少小于5 mm返矿的比例。此外，烧结-高炉的转运会造成烧结矿显著减粒。     

钢渣配入烧结的工艺参数试验及响应曲面法优化

为了优化钢渣配入烧结的最佳工艺参数,本文对钢渣及烧结原料进行性能分析,通过烧结试验研究碱度、抽风负压、配碳量和钢渣配加量对烧结参数与烧结矿质量的影响作用,同时采用响应曲面法对最佳钢渣配比及烧结参数进行优化。结果表明：在Design Expert模拟下,通过方差分析得到对烧结矿冶金性能影响程度较大的4个因素,其从大到小依次为烧结矿碱度、钢渣配比、烧结负压、燃料配比,优化后的烧结参数：碱度为1.85,钢渣配比为7.5%,烧结负压为8.9 kPa,配碳量为3.8%;在模拟最优条件下进行烧结矿质量检验,其还原性为77.2%,低温还原粉化性为73.4%,转鼓强度为71.6%,烧结矿冶金质量符合高炉冶炼的需求。     

海砂对唐山中厚板材有限公司烧结过程的影响

海砂是一种价格比较低廉的含铁矿物，作为烧结原料有利于降低烧结矿的生产成本。但海砂的粒度比较粗，颗粒形状比较规则、结构比较致密、表面比较光滑、硬度和熔点都比较高，使它的用量受到一定限制。试验表明．在唐山中厚板材有限公司烧结厂的原料条件下，烧结混合料中海砂的配比应该严格控制在20％以内。     

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。     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

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.     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.