我国炼铁精料技术的发展

<正>高炉大型化需要有与之相适应的原燃料条件,所以没有精料技术就没有高炉大型化的发展。a.目前我国新建的或更新改造的大型钢铁企业都非常重视配套大型原料场的建设,重视混匀矿的堆积技术,如宝钢等一些先进企业混匀矿的重量指标σSiO20.15和σTFe0.40,保证了烧结矿质量和成分的稳定。     

宝钢湛江炼铁杂副料的回收利用

对宝钢湛江炼铁杂副料的回收利用进行了阐述。从杂副料均质化角度出发,结合宝钢湛江炼铁的混匀矿生产实绩,分析了杂副料均质化对混匀矿质量的影响。在大量使用物化性能波动大、质量差的杂副原料的情况下,通过均质化方法堆积后,第13、14号堆混匀矿质量非常好,混匀矿中的σ_(TFe)的平均波动值从均质化前的1.19%下降到0.4%,σ_(SiO_2)的平均波动值也从以前的0.237%左右下降到现在的0.15%。     

蚁群算法在杭钢烧结混匀矿等SiO2等TFe配料中的应用

针对杭钢炼铁厂烧结工艺的要求，以混匀矿SiO2和TFe含量精度为目标函数，建立了烧结主原料混匀矿等SiO2等TFe配料数学模型，采用蚁群算法对混匀矿配比进行实时优化计算，取得了良好效果，保证了任一时刻堆积物料中SiO2含量和TFe含量与大堆预想成分中的含量基本相近。     

提高混匀矿质量实践

针对邯钢原料来源比较杂、矿点多、含铁原料品质参差不齐、SiO2含量和TFe波动大,且粉矿粒度不均一的问题。通过细化配料管理,推行TFe、SiO2推移图以及采用分阶段变流量堆料工艺,降低了二次料场堆料粒度偏析、原料湿度不同对混匀矿质量的影响,提高了配料精度和原料混匀效果,为烧结生产提供了成分稳定的烧结混匀料。     

首钢京唐等SiO_2等TFe混匀配料技术研究

入炉原料质量稳定是高炉冶炼指标改善的基础,烧结原料混匀有利于改善烧结矿质量。通过对大型料场稳定混匀矿质量技术研究,结合京唐混匀矿原料及料场设备实际情况,将现场工艺限制条件转化为计算机语言,建立数学模型,引进智能算法对模型求解。将混匀矿"等SiO_2"堆积提升为"等SiO_2等TFe"堆积,建立了混匀矿智能优化配料系统,提高了混匀矿指标,烧结矿的质量和稳定性明显改善。     

提高堆积混匀效果的研究及应用

介绍了济南钢铁(集团)总公司原料厂为提高烧结原料质量,通过DOE试验确定了堆料层数与中和料σTFe和σSiO2的量化关系,并根据实验结果对堆料机进行了改造.实验结果和改造后的效果表明,提高混匀堆料层数对提高混匀料成分稳定率有显著的效果.     

济钢烧结原料系统的技术进步

介绍了济南钢铁(集团)公司第一炼铁厂为了提高烧结原料质量,通过开发自动采制样系统、建设新汽车受料槽、提高混匀堆料层数、增加配料圆盘和采用自动变流量堆料等方面的技术进步,混匀料主要质量指标σTFe和σSiO2分别由2003年的0.5和0.21降低到2007年的0.33和0.10。     

自动变流量堆料系统的研究与应用

济南钢铁集团总公司原料厂为提高烧结原料质量,对自动变流量堆料系统进行了研究并应用于生产.混匀料的主要质量指标σTFe和σSiO2,分别由该系统应用前的0.45 %和0.12 %降低到0.34 %和0.09%.     

粘性物料对混匀矿生产的影响及控制实践

随着公司降低配矿成本及提高TFe品位的需要,混匀矿中开始逐步增加精矿粉及厂内回收的杂副原料量,此类粘性物料的配入会引起取料机取料台时低、溜槽堵塞溢料、BH易闷槽及斗轮皮带易压料等一系列问题,导致混匀矿在造堆、输出时故障率持续攀升,制约了混匀矿的生产与输出。原料厂通过改造,解决了相关问题,有效保证了混匀矿生产工艺的顺行,提高了杂副原料和精矿粉在混匀矿大堆中的用量。     

原料结构变化对混匀矿质量的影响及对策

随着海外矿石资源的开发,进口矿用量的增加,原料结构变化引起混匀矿TFe、SiO2含量波动,导致混匀矿质量控制难度加大。为了应对原料结构的变化对烧结生产的影响,烧结厂原料区采取了加强原料准备过程的控制、优化配矿结构、加强配料秤管理、提高原料含水量精准度等措施,不断提高混匀矿的质量,满足了烧结生产的要求。     

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。     

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.     

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。     

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.