化学品氧化铝的生产与市场预测

本文介绍了化学品氧化铝的主要品种及其发展过程,着重对氢氧化铝系列、高温氧化铝系列、活性氧化铝系列、分子筛系列及拟薄水铝石系列等化学品氧化铝的特性及用途进行了概述,对未来化学品氧化铝的发展进行了分析。     

ρ-氧化铝成形技术研究

以工业α-三水铝石为原料,经过快速脱水即得到ρ-氧化铝,以此为骨料添加特种拟薄水铝石经混料、捏合、成形、烘干、焙烧可以制得不同规格的圆柱形、三叶草形的活性氧化铝载体。添加定量的特种拟薄水铝石可以改善载体的物化指标,如提高其孔容,孔容的提高与加入量成正比,但加入的比例超过25%后难以成形。     

低水泥刚玉质座砖的研制

研究了骨料级配、纯铝酸钙水泥、氧化铝微粉和氧化硅微粉的加入量以及特殊添加剂对材料物理性能的影响。介绍了该材料浇注成座砖在攀钢１６０ｔ钢包上的应用。     

高性能轻质高铝浇注料的研究及应用

以微孔轻质莫来石、复相空心球、高铝矾土、氧化硅和氧化铝微粉为主要原料,用铝酸钙水泥及水合氧化铝为结合剂,研究了轻质骨料组成、微粉组成、结合体系、造孔剂对轻质高铝浇注料性能及结构的影响,在此基础上开发的轻质高铝浇注料具有较好的高温性能,应用于多种工业炉的工作层,均取得了较好的使用效果,节能成效明显。     

一种耐高温活性氧化铝的制备方法

正专利申请号:2019108170944公布号:CN110540222A申请日:2019.08.30公开日:2019.12.06申请人:中国铝业股份有限公司一种耐高温活性氧化铝的制备方法,涉及一种用于汽车尾气净化、催化燃烧等领域的耐高温活性氧化铝的制备方法。其特征在于制备过程的步骤依次包括:(1)将拟薄水铝石进行热浸除杂处理;(2)制备拟薄水铝石溶胶;(3)在拟薄水     

添加轻烧氧化镁对镁铝尖晶石轻质耐火材料烧结性能的影响

以工业氧化铝和重烧氧化镁为原料,通过添加轻烧氧化镁微粉的方法,合成了镁铝尖晶石轻质耐火材料,考察了添加轻烧氧化镁微粉对一步煅烧法制备的镁铝尖晶石轻质耐火材料烧结性能的影响.研究结果表明,添加轻烧氧化镁微粉对镁铝尖晶石的烧结具有明显的促进作用,烧结温度越高越有利于镁铝尖晶石的合成.     

氢氧化铝盐酸溶解性能研究及探讨

研究不同晶型和不同水热温度下氢氧化铝的酸溶性,及温度、时间、酸度、液固比等工艺条件对诺水铝石酸溶性的影响。结果表明:溶解效果最好的是拟薄水铝石,其次是三水铝石和诺水铝石;制备高纯铝盐时,不能先对氢氧化铝进行水热处理;β′-Al(OH)3溶解的最佳温度120℃、转速15 r/min、盐酸浓度36%～38%、时间2 h,液固比3.25。     

关于用偏铝酸钠——二氧化碳法制备拟薄水铝石的研究

前言 Preface 拟薄水铝石（又称假一水软铝石），作为一种基本的催化材料，正在受到人们的广泛关注。这是一种外表呈胶态，结构不完整的氧化铝水合物。人们之所以称其为假一水软铝石，主要是因为拟薄水铝石的X-射线衍射图谱表现为很宽的带，可以同一水软铝石的衍射峰叠合在一起。拟薄水铝石的性能则与其结晶程度密切相关。     

EDTA容量法测定拟薄水铝石的胶溶指数

拟薄水铝石胶溶指数系指其在一定作用下,已胶溶的Al2O3与原所含Al2O3的百分比。它能反映拟薄水铝石的晶相纯度、结晶程度及其使用性能,是衡量拟薄水铝石产品质量一项十分重要的指标。将拟薄水铝石在550℃灼烧2h,计算出样品中氧化铝的含量,根据Al2O3含量准确加入去离子水,配成10%的浆液,加入一定量硝酸,在磁力搅拌下,形成胶体,离心分离,弃取不成胶部分,样品中可胶溶部分的氧化铝溶解后用EDTA络和滴定法测定,从而求得样品的胶溶指数。该方法灵敏度高,重现性好,使用可靠。     

活性氧化铝的表征方法、制备及用途

本文主要论述了活性氧化铝的表征方法、用途及应用。活性氧化铝可以从微观和宏观性质两个方面进行表征；活性氧化铝产品可以分为粉状物和制品两大类。目前较为广泛应用制品成型方法是通过ρ—Al2O3和拟薄水铝石的水解行为来制备，活性氧化铝的主要应用领域是吸附领域和催化剂领域．在吸附领域．它可以被用作气体干燥、液体干燥、净化处理水等。在催化剂领域，活性氧化铝可以用作催化剂．也可以作为催化剂载体。     

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。     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

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。     

Rehabilitation of disorders of the breaking of voice

The adolescent's breaking of the voice is the result of the substitution of the chest voice (or heavy mechanism) for the head voice (or light mechanism). In cases of late breaking, the voice is abnormally high-pitched and feeble, often with a distorted timbre, while the larynx is normal and pubescent. Such people are generally not fully aware of their voices' real nature. Therapy classically resorts to laryngeal manipulations, of which a new technique is put forward. Another therapeutic approach is based, on the one hand, on critical listening compared with a control male voice, thus enabling the subject to become aware of his own voice, and, on the other hand, on high intensity work which helps passing from head to chest voice.