高压辊磨对含硫酸渣超细铁精粉生球性能的影响

摘要：为解决某钢铁企业配加20%(质量分数)硫酸渣超细铁精粉成球性差、生球性能弱的问题,开展了高压辊磨预处理球团原料实验。探究了辊速、辊压、辊磨比例等因素对混合料的成球性和生球性能的影响,研究了在适宜辊磨参数条件下配加有机黏结剂对球团爆裂性能的提升作用。结果表明：在辊速280r/min、辊压1.0MPa、辊磨比例100%条件下,混合料成球性能和生球性能显著提高,其中,静态成球指数由0.28提高至0.81,生球落下和抗压强度分别由2.9次/(0.5m)、13.62N/个提高至4.2次/(0.5m)、18.52N/个;同时当有机黏结剂配比为0.2%时,生球爆裂温度由385℃提高至445℃,生球落下和抗压强度进一步提高到6.4次/(0.5m)、20.22N/个,生球性能满足生产要求。     

高压辊磨预处理对超细粒度磁铁精矿粉球团性能的影响

 某磁铁精矿粉粒度虽然非常细,小于0.044mm的比例达到88%,但由于该矿粉颗粒形貌为板状、片状结构,故为中等成球性能矿粉。采用高压辊磨对该矿粉进行预处理后,其颗粒形貌发生很大变化,造球性能得到改善,膨润土单耗降低,但生球爆裂温度有下降趋势;高压辊磨预处理铁矿粉后,对改善预热球团矿的抗压强度效果不明显,但成品球团抗压强度得到提高。研究结果表明,高压辊磨预处理对细粒度磁铁精矿粉的造球性能及成品球强度有明显的改善效果。     

高压辊磨预处理铁精粉对生球性能的影响

介绍了在试验室用 2 0 0× 75mm高压辊磨机对磁铁精矿进行预处理的试验。对高压辊磨的工艺参数 (辊压、膨润土配比、辊速、辊磨次数、混合料水分 )进行了优化 ,考查了高压辊磨工艺对生球强度、生球破裂温度的影响。研究得出的优化参数是 :辊压为 1 75t、辊速为 10 0r/min、辊磨次数为 2次、混合料水分为 5 %。铁精矿通过高压辊磨预处理后 ,其生球强度明显提高 ,膨润土用量得到降低。     

高压辊磨预加工对铁矿粉生球干燥速率的影响

国内一种细粒级铁矿粉,经高压辊磨预加工后,对其造球性能以及干燥速率的变化进行对比研究。研究结果表明,经过高压辊磨加工,此种铁矿粉生球的性能得以改善,表现为落下次数以及抗压强度得到提高,但生球团矿的干燥速率下降,不利于生球团后期的干燥。     

高压辊磨机边料循环工艺在球团生产中的应用

采用边料循环工艺并结合三钢带式焙烧机生产实践,对高压辊磨机预处理铁精矿进行研究。结果表明,增加高压辊磨边料循环比例,铁精矿的比表面积得到了明显提高,成球性能显著改善。在造球水分为8%的条件下,边料循环50%的铁精矿比表面积、所制备生球以及焙烧球团矿各指标与同配比未经高压辊磨处理的铁精矿相比均有明显提高,铁精矿比表面积增加到1 650 cm2/g,生球落下强度达10 次/(0.5 m),返球率降至15%,成品球团矿抗压强度达到2 678 N,膨润土配比减少1.1 %,满足企业生产要求的同时,实现节能降耗的目的。     

高压辊磨对矿石中金浸出影响试验研究

介绍高压辊磨机的工作原理及其在黄金矿山的应用情况,对高压辊磨和常规破碎样品进行粒度筛析试验。结果表明,高压辊磨后细粒部分比例大幅提高,高压辊磨技术的应用可达到多破少磨的效果;对高压辊磨和常规破碎后样品进行了对比氰化试验,结果表明,如果采用全泥氰化工艺,则高压辊磨与常规破碎在金浸出率上没有明显优势;如果采用堆浸工艺,则经高压辊磨后,金浸出率比常规破碎样品有较大幅度的提高,3种样品金浸出率分别从65.15%、52.74%和76.05%提高至77.27%、85.71%和87.46%。     

高压辊磨对金矿浸出影响试验

介绍了高压辊磨机的工作原理,高压辊磨后细粒部分比例大幅提高;对高压辊磨和常规破碎后样品进行了对比氰化试验。结果表明,采用全泥氰化工艺,高压辊磨在金浸出率上没有优势,金浸出率由89.80%降为79.88%;而采用堆浸工艺,则经高压辊磨后,金浸出率比常规破碎样品有较大幅度的提高,从53.85%升至79.88%。     

高压辊磨的历史、发展现状及技术展望

从高压辊磨的工作原理入手,回顾了高压辊磨的发展历史,介绍了高压辊磨技术的特点及当今工程中应用的典型流程,分析了高压辊磨的设备应用趋势、高压辊磨流程的发展方向以及未来的发展前景。     

钼矿石高压辊磨风力分级试验研究

通过高压辊磨风力分级产品与常规磨矿产品小型对比试验,得出了高压辊磨风力分级工艺可提高钼有效可选粒级含量,提高选钼效率。通过半工业试验,高压辊磨风力分级工艺与其可代替的常规磨矿分级工艺比较,可降低生产成本。该工艺从技术和经济上可行,为今后有色金属矿山磨矿分级工艺改造提供了一个新思路。     

高压辊磨机在工业上的应用

高压辊磨机与对辊破碎机比较,能得到相当多的粉碎的细颗粒,压力越大,细粒级越多;这是由于料层中的颗粒在高压受力时,产生了很多微观裂缝。本文描写了高压辊磨的结构设计、驱动型式以及应用于矿业中的开路与闭路的工艺流程配置,主要用于湿磨,干磨的初磨作业。目前已生产辊径为1～2.8m的高压辊磨机,安装功率高至1200kW,作为初磨机能提高处理能力为55％。     

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。     

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.     

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.