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研究粉煤灰原料微观结构特性,确定粉煤灰原料物理化学性能及高温特性,为粉煤灰的开发利用提供理论依据.重点研究粉煤灰原料的物相组成(XRD)、综合热性能(TG-DSC)、化学组成(ICP-AES)、微观形貌(FESEM)及其宏观性能(粒度分布、比表面及孔隙率、耐火度等),结果表明:粉煤灰的主要物相为莫来石和刚玉相,其中(Al2O3+ SiO2)含量近90%;粉煤灰颗粒呈规则圆球形,颗粒表面光滑平整,并含有部分空心球,颗粒粒度约20 ~ 25 μm,90%的颗粒均在71μm以内;粉煤灰高温性能稳定,耐火度高,可作为开发轻质耐火材料的原料. 相似文献
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对神东某矿区高效煤粉工业锅炉粉煤灰的工业分析、化学组分、矿物构成、粒度分布、孔隙结构及微观形貌等进行了研究分析.结果表明,该样品的化学成分以SiO2和Al2O3为主,其次是CaO和Fe2O3;固定碳含量为0.69%,在1 000℃下的烧失量为4.35%.粉煤灰粒度主要集中在50μm以下,其中粒径为10μm左右的颗粒所占比例最多,约占粉煤灰颗粒总量的4.8%.微观结构以狭缝状孔道为主,并且含有较多的二次孔,孔径分布以中孔为主,孔径为3.8nm,BET比表面积为36.5m2/g.从微观形貌上看,粉煤灰由空心或实心的球形及一些形状不规则的颗粒构成,其中以球形颗粒为主. 相似文献
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用激光粒度仪测定不同细度粉煤灰的粒度分布,以灰色关联方法分析了粉煤灰粒度分布与其活性之间的相关性.研究表明:粉煤灰粒度分布明显影响其活性;0~19.953 μm范围内的颗粒体积分数与粉煤灰活性指数的关联极性均为正,说明这些颗粒对粉煤灰的活性有积极贡献;其中以5.012~19.953 μm的关联度为最大,说明该粒径范围内... 相似文献
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粉煤灰粉体颗粒细度与分维数研究 总被引:1,自引:0,他引:1
利用分形几何学原理研究粉煤灰粉体颗粒,探讨了粉煤灰粉体粒度的分布特征,测试、计算了相应的分形维数,研究表明:(1)粉煤灰粉体颗粒粒度分布都表现出分形分布,粉体粒度分布的分维值1〈D〈3;(2)粉煤灰粉体颗粒的分维值越大,其细度比和细度模数越小,其形态系数随之增大;(3)粉煤灰粉体颗粒的分维数与需水量比的关系成曲线关系,大致在分维值2以下时,其需水量比逐渐增大;但分维值大于2以后,其需水量比逐渐下降。 相似文献
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对比研究了生物质灰与普通粉煤灰在粒度分布、颗粒形态、化学组成、活性指数等方面的不同,并开展了不同掺量生物质灰对水泥硬化浆体抗压强度的影响研究.结果表明:生物质灰颗粒形状不规则、平均粒径及粒径分布范围较大,具有特有的细长纤维状颗粒,且其活性组分Al2O3不足普通粉煤灰的三分之一;生物质灰的火山灰活性小于普通粉煤灰;相同掺量下,生物质灰-水泥复合胶砂各龄期的抗压强度均小于普通粉煤灰-水泥复合胶砂,生物质灰掺量越大,复合胶砂的强度相比纯水泥组下降程度越大;与普通粉煤灰相比,掺加生物质灰的硬化水泥浆体微观结构更为疏松多孔,特别是其特有的细长纤维状颗粒的存在. 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献