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针对镁质浇注料在使用过程中抗渣渗透能力差,易剥落等问题,本实验加入铝镁尖晶石对镁质浇注料进行改性研究.实验分为两部分:先将镁砂细粉、镁质添加剂和铝镁尖晶石细粉等机压成型,进行高温热处理,研究其物相组成和显微结构;然后以电熔镁砂为骨料,电熔镁砂细粉、氧化铝微粉、铝镁尖晶石细粉和镁质添加剂为基质,按骨料:细粉=75∶25进行配制,研究铝镁尖晶石加入量对镁质浇注料性能的影响.结果表明:在镁质材料中引入尖晶石,能促进结构致密化;加入9%的铝镁尖晶石的浇注料试样显气孔率低,线变化率小,体积密度大,强度大,抗渣性能最好,由于镁铝尖晶石生成时体积膨胀,使得材料结构致密化;同时能有效吸收渣中CaO及FeOx等成分,减少渣的渗透作用,从而提高了浇注料的抗渣性能. 相似文献
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以棕刚玉、碳化硅、α-Al2O3微粉、白刚玉、硅微粉、97硅粉、Si3N4粉为主要原料,以高铝水泥为结合剂,制备了铁沟浇注料,研究了Si3N4加入量(质量分数分别为0、3%、6%、9%、12%)对试样抗渣性能的影响.结果表明:加入氮化硅的浇注料具有更优异的抗渣性能.抗渣机理为:一方面由于材料在烧结过程中Si3N4能部分保留下来,并生成了O'-Sialon,使得材料的抗渣性能增强;另一方面,材料在烧结过程中体积膨胀,减少了铁渣渗透的通道,也提高了材料的抗渣性能. 相似文献
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以电熔镁砂为主要原料,通过改变刚玉细粉的加入量,在110℃、24h烘干及1 500℃、3h烧成制度下,研究了刚玉细粉的加入量对镁质浇注料性能的影响。结果表明,当刚玉细粉的加入量大于或小于6%时,镁质浇注料显气孔率大、耐压强度低、抗渣性能差。当刚玉细粉加入量为6%时,镁质浇注料综合性能优良。 相似文献
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以配料组成(w):≤3 mm的高纯镁砂82%、≤3μm的SiO2微粉6%、≤0.043 mm的SiC微粉9%、≤0.045 mm棕刚玉微粉3%、≤0.045 mm的Al粉0.5%(外加)为基础配方,用炭黑替代部分镁砂粉研究了炭黑添加量(w)为0、0.2%、0.4%、0.6%时对镁质浇注料施工性能、力学性能及抗渣性能的影响。结果表明:在加水量一定的情况下,随着炭黑加入量的增加,浇注料的流动性能逐渐降低;干燥后试样的抗折强度和耐压强度均高于1 500℃3 h热处理试样的;不同气氛下烧结,浇注料的抗渣性呈现逐渐增强的趋势,在炭黑加入量为0.2%~0.4%(w)时,浇注料具有较好的常温物理性能及抗渣性。 相似文献
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分别以98电熔镁砂和95烧结镁砂为原料,按骨料与基质料的质量比70:30配料,并外加不同量环保型无机结合剂Na2SiO3.9H2O制成试样,200℃3 h烘干后,分别于1 100℃3 h和1 550℃3 h进行热处理。通过常温性能检测、显微结构观察,研究了镁砂原料的种类及结合剂Na2SiO3.9H2O的添加量(质量分数分别为4%、5%、6%、7%)对镁质干式料性能的影响,并采用静态坩埚法评价了试样的抗渣性能。结果表明:(1)以电熔镁砂为原料的试样,其常温物理性能优于烧结镁砂的;(2)结合剂Na2SiO3.9H2O的适宜添加量为5%;(3)Na2SiO3.9H2O结合的试样其抗渣性能优于酚醛树脂结合的;(4)渣蚀过程以渗透为主,在渗透的过程中,方镁石与熔渣反应,使熔渣的黏度增大,减缓了其进一步渗透。 相似文献
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以粒度为3~1、≤1、≤0.088 mm的中档烧结镁砂为主要原料,按骨料与基质的质量比65 35配料,选用糖、硅酸钠为复合结合剂制备了镁质干式振动料试样。采用静态坩埚法研究了糖、硅酸钠加入量和添加剂(分别为铝矾土粉,α-A l2O3粉)对干式振动料抗渣性能的影响。结果表明:1)糖、硅酸钠复合加入对镁质干式振动料抗渣性能不利,糖和硅酸钠加入量(w)分别为4%和2%时相对最好;2)镁质干式振动料的渣蚀过程以渗透为主;引入高铝矾土粉和α-A l2O3粉均可与镁砂(MgO)高温下反应生成的尖晶石(MA)可以显著提高干式振动料的抗渣性能。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献