机械磨在氢氧化铝粉碎中的应用

本就机械磨生产氢氧化铝填料，与其它两种粉碎设备进行了比较，并指出机械磨不仅能保证产品质量，而且具有产量高、能耗低的优点，应大力推广应用。     

降低玛瑙填料氢氧化铝色差研究

本课题首先在实验室条件下研究了铝酸钠溶液质量、二氧化碳气体杂质、洗涤用水的质量、烘干条件、氢氧化铝的粒度、粉碎条件对玛瑙填料氢氧化铝色度的影响,找出了生产玛瑙填料的工艺条件。接着,在分解试验的基础上直接生产出了75~90μm碳分玛瑙填料铝,90~110μm的种分玛瑙填,粉体加工技术生产出了40~60μm种分玛瑙填料。从美国和韩国反馈回来的结果可知,出口美国玛瑙填料氢氧化铝"A+1"品级率达到90.33%,出口韩国"C+D"品级率达到84.85%,都达到了预期目标。     

填料用高岭土深度加工新工艺

高岭土粉体是塑料和橡胶制品的重要填料,以往国内的高岭土粉体加工只限于一般的碾磨机械粉碎,难以使高岭土粉体细度提高。近年来通过对高岭土粉体进行超音速气流粉碎,使高岭土粉体细度大幅度提高,如     

4万吨高白填料氢氧化铝项目的改造设计

分析了原有高白填料氢氧化铝制备车间的工艺路线、设备类型,以及由此产生的产品缺陷。通过采用平盘过滤机、超细立磨等设备对原有车间进行了技术改造,并将改造前后产品的质量情况进行了对比。主要介绍了改造技术路线的工艺和主要设备的参数、配置。该技术路线集过滤～烘干～粉碎～混料于一体,可降低产品吸油量、稳定粒度分布,达到提高产品品质、降低生产成本的目的。     

一种新型磨矿介质设计与磨矿试验研究

为了缓解硫化矿选厂粗粒欠磨与细粒过磨等问题,设计了一种新型磨矿介质-黄金分割锻球.通过2种介质磨矿试验对比,表明锻球磨矿具有针对性强,磨矿效果好,试验指标显示：锻球磨矿的产品粗粒会减少0.80%,中等粒级增加3.26%,细粒减少2.46%.分析发现锻磨在磨矿中与物料接触有相当一部分为线接触,细粒因粗粒的“架桥”作用而减少了过粉碎,钢球介质与矿物接触为点接触,粗粒的架桥作用不明显,对粗粒与细粒的粉碎作用具有一致的概率,故选择性差,过粉碎现象严重.设计的锻球介质能明显的缓解粗粒欠磨与细粒过粉碎等问题.     

气流粉碎技术在锑工业上的应用

一、概述随着科学技术的迅速发展,各个工业领域对粉体的超细粉碎提出了迫切的要求,而目前国内的各类粉碎机要使粉体达到1微米以下是很困难的。气流粉碎机是一种新的粉碎技术设备,它能担当起连续和大量的超细粉碎任务,已广泛应用于所有粉体加工领     

拜耳法生产易溶氢氧化铝的工艺技术

基于易溶氢氧化铝生产聚合氯化铝的优势和工艺开发的必要性,山东某铝公司在全部使用澳矿的拜耳法流程基础上,研发了一系列易溶氢氧化铝生产技术,如制备活性晶种、快速连续分解工艺、提高种子活性、降低洗水比、提高白度等,有效提高了易溶氢氧化铝的酸溶率、白度等指标,并达到了节能降耗的目的。     

采用气流粉碎、分级生产碳化钨粉的方法

该发明属于采用气流粉碎、分级生产碳化钨粉的方法，包括粗破碎、气流粉碎、气流分级及物料收集。该发明克服了传统思维及观念的影响将常规用于食品、医药、矿山等行业的气流粉碎、分级方法，根据WC硬度高、密度大、熔点高等特点设计气流粉碎、分级中各工艺参数，使之不但可生产平均粒度小于0．2μm的超细WC粉、且生产率提高3～4倍，产出率高达99．5％以上．产品中杂质含量及粗大和聚集颗粒大幅度降低。设备投资降低65％左右，生产成本降低40％～70％。而具有生产率高、生产成本低、产品质量及纯度高、设备投资省等特点。克服了球磨及筛分法难以生产粒径小于0．2μm的超细WC粉及生产率低、产品含杂量高、质量较差而生产成本高等缺陷。     

铝酸钠溶液碳分—超声酸洗制备高纯Al_2O_3

研究了分解温度、CO_2气体浓度、Al_2O_3浓度和分解时间对铝酸钠溶液碳分Al_2O_3分解率的影响,以及碳分后得到的氢氧化铝粉体在酸洗过程中超声波酸洗对产品氧化铝纯度的影响。结果表明,在溶液浓度105g/L、溶液苛性分子比αk=1.50时,控制碳酸化分解温度60℃左右,CO_2浓度30.0%,分解时间4h,分解率达到93%,碳分后得到的氢氧化铝粉体在普通酸洗条件下得到的Al_2O_3含量为99.87%,超声波酸洗后得到的Al_2O_3含量可以达到99.99%。     

拜耳法精液生产高白氢氧化铝的研发

通过对当前氧化铝工业现状的分析,提出了研发高白氢氧化铝的优势和必要性。同时,通过利用拜耳法精液生产高白氢氧化铝的研发项目,解决了拜耳法厂面临生产精液当中有害杂质去除难、产品指标难控制等问题,提高了精液的品质。     

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.