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锰对硅酸盐水泥熟料煅烧的影响 总被引:1,自引:0,他引:1
通过高温差热分析、XRD、高温显微镜分析、SEM、EPMA以及测定fCaO等方法研究了MnO2对硅酸盐水泥熟料煅烧的影响。试验结果表明,锰主要分布在中间相,随着MnO2外掺量的增多,熟料中铁相含量增多,C3A及C3S含量减少,液相大量出现的温度升高。当MnO2掺量小于20%,煅烧温度高于1400℃时,MnO2对生料的易烧性影响不大;当煅烧温度低于1400℃时,MnO2使得生料的易烧性变差。MnO2外掺量越多,生料易烧性越差。MnO2没有矿化作用,它的存在抑制了CaF2的助熔及矿化作用。 相似文献
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1引言众所周知,生料中掺入矿化剂,可以改善生料的易烧性,提高熟料质量和降低能耗。值得注意的是有些立窑水泥厂,掺加矿化剂或复合矿化剂后没有达到预期效果。出现凝结时间不正常,而且强度也忽高或者忽低,在熟料烧失量<10%,fCaO<30%情况下,安定性... 相似文献
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贵州遵义李家湾水泥厂为年产10万t立窑水泥厂,该厂采用低铁、高硫配料方案。取得了理想的技术经济效果。1生、熟料成分控制表1为该厂的原料、生料、熟料成分分析结果。其配料方案的特点为:(1)生料中不再掺加铁质校正原料,熟料中氧化铁含量完全由其它原、燃料所引入,生料中氧化铁含量一般为1.6%~2.0%;(2)采用萤石和磷石膏作为复合矿化剂,生料CaF2含量控制为0.3%~0.4%,SO3含量控制为1.2%~2.0%;(3)生料中要求较高的氧化铝含量,控制在3.7%~4.0%较为合适,为此该厂在生料中掺入1… 相似文献
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为探讨煅烧煤矸石在水泥生产中的应用,按KH=0.88~0.92,SM=2.1~2.5,肼=1.2~1.9的熟料率值控制,分别掺入4%,6%和8%的煅烧煤矸石代江砂配料,进行了煤矸石对生料易烧性影响的试验;同时进行煤矸石掺量对熟料烧成制度(烧成温度和烧成时间)影响的研究。在此基础上,进行了煅烧煤矸石对水泥熟料矿物形成过程、组成及质量的影响和作用机理分析探讨。结果表明:(1)掺入4%-8%的煅烧煤矸石,可明显改善生料的易烧性,减少f-CaO含量并能降低烧成温度50~100℃;(2)对掺入6%的煅烧煤矸石并经1250℃,1300℃和1400℃烧成物料的XRD分析可知,在1300℃其烧成反应已较充分,C3S结晶程度高.其熟料烧成范围为1300~1400℃;(3)煤矸石与矿化剂复掺可进一步改善生料的易烧性,其中复掺萤石效果最好。 相似文献
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尾矿及氟硫复合矿化剂对生料易烧性影响及中间过渡相研究 总被引:1,自引:1,他引:0
运用XRD,DTA,化学分析,生料膨胀收缩等分析测试手段,研究了铜尾矿和铅锌尾矿及尾矿与氟硫复合矿化剂对生料易烧性的影响及机理,结果表明,水泥生料中掺入尾矿明显地改善了生料的易烧性,如尾矿与氟硫共掺则效果最佳,并对系统中出现的中间过渡相-氟硫硅钙石进行了研究,当水泥生料中存在Al2O3,MgO及用工业原料和尾矿替代化学纯原料时,氟硫钙硅石的分解熔融温度从1267℃左右下降至968℃,并产生不一致熔 相似文献
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稀土对水泥熟料矿物形成的作用 总被引:5,自引:1,他引:4
稀土元素氧化物于0.2 ̄2.0×10^-4的微量范围内可改善水泥生料的易烧性,降低熟料中游离氧化钙含量,增加阿利特含量。在该微量范围内,随着稀土含量增加,其作用相应增强;但超过2.0×10^-4后,即使稀土元素氧化物含量增至1.0×10^-3,其作用增幅亦不大。煅烧温度于1300℃以下,稀土的作用甚弱,而于1350℃至1400℃时其作用较显著。不同种类的稀土元素对水泥熟料矿物形成的作用有差别,镧系 相似文献
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通过实验研究了在生料中掺加镁渣对熟料煅烧、辊磨系统运行及用作非活性混合材对水泥性能的影响。实验结果和生产实践表明,生料中的镁渣掺量≥8.0%时,可明显改善生料易烧性,大幅提高熟料的抗压强度;镁渣中含有少量Ca F2,可起到矿化剂和晶种的作用,可改善生料易烧性;用镁渣代替水泥中的石灰石和炉渣等非活性混合材,可提高水泥3d抗压强度,但不会影响水泥的抗收缩性能。 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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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 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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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