帘线用钢夹杂物控制技术研究

本文从夹杂物形态、尺寸、成分及热力学计算等方面分析了帘线用钢夹杂物的控制技术。生产过程中采用Si、Mn合金进行终脱氧,结合碱度1.0左右的精炼渣,以及冶炼过程避免采用铝等措施,夹杂物控制可以满足帘线用钢质量要求。     

利用加氢裂化轻质油研制烧烤炭油

以加氢裂化轻质白油为原料,通过精馏切割、精制,研制烧烤炭专用油。经分析和试验表明：所制取的烧烤炭专用油达到容易点火燃烧、无黑烟、金属无炭黑,所含重金属和稠环芳香烃等有害物质极微,烧烤食品安全,不污染环境等要求,满足了人们的生活需求。     

春秋时期采邑炼铜业和铸铜业初探

近年来在今山东曲阜、湖北钟祥等地相继发现了春秋时期的炼铜、铸铜遗址。根据古代文献以及前人的研究,可初步认定在春秋时,某些卿大夫的采邑与这些遗址的所在地可能位于同一区域内,那么由此可推断春秋时期这些采邑中可能存在着炼铜业或铸铜业。这有助于扩大对春秋时期采邑经济的进一步认识。     

生化法处理炼油污水最佳工艺条件控制研究

通过对二级生化处理最佳工艺条件控制系列试验,探索了微生物种群与有机物降解率的关系,获得了提高水质达标率的数据,对炼油污水二级生化处理具有现实意义.     

RH和RH-KTB精炼过程中钢液流动和混合特性的研究

The flow and mixing characteristics of molten steel during the vacuum circulation refining,including RH(Ruhrstahl-Heraeus) and RH-KTB(Ruhrastahl-Heraeus-Kawasaki top blowing) processes,were investigated on a 1/5 linear scale water model of a 90t multifunction RH degasser,The circulation rate was directly and more accurately determined,using a new method by which the more reliable results can be obtained.The fluid flow pattern and flow field in the ladle were demonstrated,observed and analyzed.The mixing time of liquid in the ladle was measured using electrical conductivity method.The residence time distribution in the RH model was obtained by tracer response technique.The influence of the main technological and geometric factors,including the gas top blowing*(KTB) operation,was examined.The results indicated that the circulation rate of molten steel in the RH degasser can be fairly precisely calculated by the formula:Q1p=0.0333Qg^0.26Du^0.69Dd^0.80(t/min),where Qg-the lifting gas flow rate(NL/min);Du and Dd-the inner diameters of the up and down-snorkels(cm),respectively.The maximum value of circulation rate of molten steel in the case of the 30cm diameters either of the up-and down-snorkels for the RH degasser(the “Saturated” rate) is approximately 31 t/min.the corresponding gas flow rate is 900NL/min.Blowing gas into the vacuum chamber through the top lance like KTB operation does not markedly influence the circulatory flow and mixing charateristics of the RH process under the conditions of the present work.There exist a major loop and a large number of small vortices and eddies in the ladle during the RH refining process.A liquidliquid two-phase flow is formed between the descnding stream from the down-snorkel and the liquid around the stream.All of these flow situation and pattern will strongly influence and determine the mixing and mass transfer in the ladle during the refining.The correlation between the mixing time and the stirring energy density is τmε^0.50 for the RH degasser.The mixing time rapidly shortens with an increase in the lifting gas flowrate.At a same gas flow rate,the mixing times with the up-and down-snorkel diameters either of 6 and 7cm are essentially same.The 30cm diameters either of the up-and down-snorkels for the RH degasser would be reasonalble.The concentration-time curve showed that three circulation cycles are at least needed for complete mixing of the liquid steel in the RH degasser.     

汽车尾气的催化净化技术研究

随着我国对汽车排放法规的日趋严格,催化净化技术对汽车尾气的治理显得尤为重要。本文系统论述了催化净化技术的发展、类型;催化剂的组成;三效催化转化器的构成、工作过程及应用中的问题等。     

提高拜耳法晶种分解率的途径分析

结合生产实际,分析造成种分分解率低的原因,提出了降低溶出液αk、减小精液αk与溶出液αk的差、适当提高分解槽固含、制定合理的温降制度、适当延长分解时间等提高分解率的有效途径。     

信息时代传统主流媒体如何提升新闻提炼能力

在信息时代背景下,＂内容为王＂仍然是新闻传播的核心竞争要求,而对新闻的提炼能力是至关重要的新闻传播核心竞争力之一。在论述新闻提炼的概念和要求的基础上,分析了主流媒体提升新闻提炼能力的3个途径。     

装饰造型的表现手段

装饰造型是生活中最为普遍的审美行为。装饰造型的基础是人们对自然中的客观事物的细微观察与启示。也是客观事物引起审美愉悦的结果。对客观事物的认识是装饰造型的基本来源。我们把在客观现实中认识的装饰材料通过主观的整合．利用夸张、变形、取舍等造型原理去掉其无序性、杂乱性、易逝性。使其更加符合艺术美．提高审美质量。     

感应钢包炉结构与电磁特性的改进

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