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冶金工厂的各种废渣,过去一直当作废物排放,侵占农田,污染江河,使得冶金企业环保赔款不断增加,有的企业还因此而被迫停产。近年来冶金渣作为建筑材料虽选用了一部分,但是绝大多数工厂还是堆积如山,目前国内外已出现利用冶金渣作廉价农用肥料的情况。苏联利用钢渣和高碱度铁合金渣制备钙肥已有报道。他们认为炼钢炉渣渣粉是农业用户的宝贵矿物肥料。炼钢炉渣除含氧化钙外,还含有一系列微量元素、磷和其它能影 相似文献
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以钢铁厂的钢渣尾料和水淬矿渣为主要原料,对钢渣尾料和水淬矿渣分别进行湿法球磨,通过原材料计量混合、搅拌加热、浇注发气、静停预养、脱模切割、养护、陈化检验等工序处理后生产出了冶金渣蒸压加气混凝土砌块,其中,复合外加剂的引入可显著提高冶金渣蒸压加气混凝土砌块各项性能指标.试验结果发现不同养护条件下的加气混凝土砌块存在立方体... 相似文献
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进行了国内外冶金行业的景气分析,通过对山西省冶金行业的发展状况、存在问题和主要优势、发展潜力几个因素的分析,提出了山西省冶金行业的发展策略,如支持重点企业、加快太原不锈钢生态工业园建设、加快冶金行业的物流建设等. 相似文献
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为了提高钢渣的利用率,改善掺入钢渣对混凝土电通量的不利影响,通过磷渣粉与钢渣粉复掺的方式,制备了强度等级为C40的钢渣粉-磷渣粉混凝土。采用扫描电镜和压汞法等手段,研究了钢渣粉、磷渣粉单掺及复掺时对混凝土水化产物和微观结构的影响。试验结果表明:当总掺量为60%(钢渣粉与磷渣粉掺量比为2∶1)时,28 d抗压强度达到59.4 MPa,是空白组的116%,56 d电通量为1 450 C,低于空白组电通量,比单掺40%钢渣粉组的电通量降低了1 749 C。该复掺方式比单掺钢渣粉或磷渣粉更能减少水泥的用量。磷渣粉的掺入使钢渣粉掺量从20%左右提升到了50%,不仅提高了钢渣粉的利用率,还改善了钢渣粉掺入对混凝土抗氯离子渗透性的不利影响。 相似文献
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生态工业园是实现可持续发展和绿色经济途径之一的,被认为是继经济技术开发区、高新技术开发区之后的第三代产业园区.从生态工业园的概念及其目标出发,用社会经济、绿色经济、资源消耗和可持续发展度4个因素18个指标构建生态工业园及其区内企业发展能力评价模型,以避免评价指标单一、评价过程不合理的问题. 相似文献
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研究了钢渣对氧化镁坩埚的侵蚀.试验结果表明,钢渣对氧化镁坩埚的侵蚀有两个方面,坩埚中氧化镁向渣中溶解及渣中低熔点氧化物向坩埚中扩散,并介绍了解决办法. 相似文献
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钢渣用作建筑材料时,由于其中含有大量游离氧化钙(f-CaO),稳定性较差,通常需要改性钢渣以提高其稳定性、胶凝性.在对钢渣、高炉渣进行化学成分和矿物组成分析的基础上,对高炉渣改性钢渣的可能性进行了热力学计算,结果表明高炉渣中的SiO2与钢渣中f-CaO反应,生成胶凝相,同时降低了钢渣中的f-CaO含量.本文通过研究热态高炉渣改性钢渣,结合X射线衍射、拉曼光谱、扫描电镜及能谱分析等研究方法,对改性钢渣的矿物成分、f-CaO含量、黏度变化等进行了分析.研究发现随着热态高炉渣配比量的增加,改性渣黏度缓慢增加,改性钢渣中f-CaO、RO相含量降低,改性渣的胶凝性能提高.在1550℃下,钢渣中添加10%高炉渣时,改性渣中2CaO·SiO2(C2S)、3CaO·SiO2(C3S)含量显著提高,f-CaO质量分数降至1.64%,稳定性大大提高,符合建材化使用要求.此外,进一步使用焦炭还原改性渣中的铁,轻松实现了渣铁分离,提高改性渣的易磨性. 相似文献
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Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
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Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly. 相似文献
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理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。 相似文献
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As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death. 相似文献
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Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula- 相似文献
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Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re- 相似文献
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Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that 相似文献
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《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献
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《吉林大学学报(理学版)》2014,(5):1105
<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has 相似文献