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.     

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.     

降低烧结矿低温还原粉化率的试验研究

随着太钢450 m2烧结机投产,配矿结构中进口矿粉比例大增,烧结矿低温还原粉化率升高.为了保高炉精料,进行了烧结矿喷洒CaCl2溶液的试验研究并加以实施,烧结矿低温还原粉化率平均降低4 %～6 %,取得了比较明显的效果.     

降低湘钢烧结矿低温还原粉化率的试验

对湘钢烧结矿喷洒工业废液进行表面处理，经试验检测及２高炉工业试验，初步取得了降低烧结矿低温还原粉化率一高炉冶炼期增铁节焦的良好效果。     

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.     

高炉生产使用喷洒CaCl2溶液的烧结矿的试验研究

韶钢高炉使用喷洒ＣａＣｌ２溶液的烧结矿的工业试验结果表明,烧结矿喷洒ＣａＣｌ２Ｉ溶液后对降低高炉上部炉料的低温还原粉化。改善料柱透气性,促进炉况顺行起到了较大作用。喷洒ＣａＣｌ２溶液浓度３％、液量１％时效果较好,高炉可增产３．２％降低焦比１．５％。     

烧结矿表面喷洒CaCl2溶液应用试验

1 前言 烧结矿和球团矿的低温还原粉化是影响高炉生产的重要因素之一.改善烧结矿低温还原粉化性能的措施一般有提高烧结矿的FeO和MgO的含量、生产高碱度烧结矿、添加蛇纹石、硅石等,但这些措施对烧结矿质量和品位有一定的影响,而且使高炉燃耗增加.因此,20世纪80年代中期,国外烧结生产者研究开发了能降低烧结矿低温粉化的方法--卤素溶液法.     

烧结矿喷洒氯化钙的试验研究

通过试验室试验和工业试验，得知在梅山原料条件下，采用喷洒CaCl2技术，可有效地抑制烧结矿低温还原粉化，改善冶金性能。工业试验结果表明，配加浓度为4％、喷洒量为4．2kg／t—s的CaCl2溶液，烧结矿RDI 3.15提高5．63％。高炉使用该矿后，炉况顺行，生产率提高，能耗降低，为高炉带来较大经济效益。     

抑制烧结矿的粉化

1.前言烧结矿的粉化,是指烧结矿在自然冷却过程中,在不受外力影响的情况下,矿体由于逐步碎裂,产生灰色粉末的现象。我厂自1987年11月17日新建的二号高炉投产后,烧结矿耗用量增加一倍多,但烧结生产的工艺和设备仍用原来供应一座高炉生产时期的,而供应烧结生产的原材料更为紧     

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.     

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。     

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.     

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.