CaF2对阿利特-硫铝酸锶钙水泥性能的影响

将硫铝酸锶钙矿物引入到硅酸盐熟料矿物体系中,合成阿利特-硫铝酸锶钙水泥.利用XRD,SEM-EDS和岩相等测试手段研究了CaF2对阿利特-硫铝酸锶钙水泥熟料矿物组成和水泥性能的影响.结果表明,CaF2能够促进固相反应使得阿利特在较低温度下形成,有利于阿利特和硫铝酸锶钙矿物的共存.当CaF2在熟料中的掺入量为0.6%时,阿利特-硫铝酸锶钙水泥的1 d、3 d和28 d抗压强度分别达到32.8 MPa、67.7 MPa和120.4 MPa,表现出良好的力学性能.     

MgO对阿利特-硫铝酸锶钙水泥组成、结构和性能的影响

利用X射线衍射、扫描电子显微镜、能谱和岩相分析研究了MgO对阿利特-硫铝酸锶钙水泥矿物组成、结构和性能的影响.结果表明:当MgO含量为1%～5%时,阿利特-硫铝酸锶钙水泥早期强度明显提高;MgO在水泥中的最佳含量为2%,在最佳掺量条件下,其3 d和28 d强度分别为64.3 MPa和103.6 MPa;适量的MgO能够...     

钡掺杂对高阿利特硅酸盐水泥熟料组成与性能的影响

采用正交试验方法研究了掺杂氧化钡及形成的新矿物硫铝酸钡钙(C_(2.75)B_(1.25)A_3(S))对高阿利特水泥熟料组成与性能的影响.借助于X射线衍射和扫描电镜-能谱仪及岩相等分析方法,研究了水泥熟料的组成、结构及性能.结果表明:阿利特和硫铝酸钡钙矿物可以在同一熟料体系中共存;氧化钡的掺入促进了硫铝酸钡钙矿物的形成,同时对在低温下形成阿利特及对贝利特矿物的活化起到了重要作用.从早期强度角度分析,BaO的适宜掺量为1.8%(质量分数,下同),硫铝酸钡钙矿物的最佳设计含量为4.0%.所制备的高阿利特硅酸盐水泥的3,7,28d抗压强度分别为52.3,78.4,102.5MPa,展现了良好的早期力学性能;从后期强度分析,BaO的适宜掺量为1.3%,硫铝酸钡钙矿物的最佳设计含量为2.0%,所制备的高阿利特硅酸盐水泥的3,7,28d抗压强度分别为42.9,77.8,108.8MPa,显示了较高的后期强度.     

阿利特-硫铝酸锶钙水泥的制备与性能研究

通过固定硅酸盐水泥熟料率值,改变硫铝酸锶钙矿物的含量,研究了阿利特-硫铝酸锶钙水泥的合成与性能。利用X射线衍射、扫描电镜与能谱分析、岩相分析等测试手段分析了阿利特-硫铝酸锶钙水泥熟料的组成和结构。结果表明,硫铝酸锶钙矿物与硅酸盐熟料矿物可以共存,其最佳引入量为6%～12%,在1350～1380℃温度范围烧成时结晶较好。在上述条件下制备的阿利特-硫铝酸锶钙水泥的ld、3d和28d抗压强度最高分别达到30.5MPa、58.4MPa和122.2MPa。     

阿利特-硫铝酸钡钙水泥材料制备技术的研究

通过正交试验研究制备阿利特-硫铝酸钡钙水泥材料。结果表明：阿利特和硫铝酸钡钙矿物能够共存于同一熟料体系,这为合成阿利特一硫铝酸钡钙水泥材料奠定了重要基础;对该熟料力学性能影响程度最大的因素是矿物设计比例,其次是煅烧温度,各因素的最佳水平分别为矿物设计比例C3S：C2S：C2.75,5B1.25A3S^-=15：15：65。煅烧温度为1350℃,Fe2O3掺加量为1％,CaF2掺加量为2％;同时,在最佳水平条件下制备的熟料1d,3d和28d抗压强度分别达到51．7MPa,77．0MPa和79．5MPa,展现出良好的早期力学性能。同时利用XRD和SEM-EDS对熟料矿物组成及结构进行了分析。     

硫铝酸盐与硅酸盐矿物合成高性能水泥

主要阐述以硅酸盐矿物阿利特(C3S)或贝利特(C2S)与硫铝酸盐矿物硫铝酸钙(C4A3S↑-)或硫铝酸钡钙[C(B)1A3S↑-]为主导矿物的复合型水泥的组成设计、低温合成技术及其性能与应用,同时还阐述了具有突出快硬旱强特点的硫铝酸钡钙矿物的性能以及由该矿物复合成的新型水泥的研究进展,对以阿利特-硫铝酸钡钙为主导矿物的新型高胶凝性水泥的发展前景进行了展望。     

MgO对熟料烧成及性能的影响机理

采用化学试剂合成硅酸盐水泥熟料,应用X射线衍射结合Rietveld方法和差示扫描量热等,研究了MgO对熟料煅烧、矿物组成、阿利特晶型及熟料性能等的影响。结果表明:MgO在碳酸钙分解反应阶段已开始影响甚至参与了熟料烧成反应;MgO掺入使阿利特和铁铝酸四钙含量增多,贝利特和铝酸三钙含量相对降低;但当MgO掺量达到2%(固溶置换极限)及以上时,方镁石形成,熟料矿物组成基本不再变化;随着MgO的掺入,阿利特的晶型逐渐由M1型为主转变稳定为M3晶型。MgO掺量在1%附近时,靠近阿利特准同型相界处,熟料发展强度最高。     

贝利特-硫铝酸钡钙水泥的微观结构和力学性能

贝利特-硫铝酸钡钙水泥是一种新型的水泥材料,通过在贝利特熟料矿物体系中引入硫铝酸钡钙矿物,达到提高贝利特水泥早期强度的目的.研究了过量掺加SO3和BaO对贝利特-硫铝酸钡钙水泥性能的影响.研究结果表明:熟料中SO3和BaO最佳过掺量(质量分数)分别为50%和80%,制得的贝利特-硫铝酸钡钙水泥的3 d和28 d抗压强度分别达到27.0MPa和85.6MPa,展现了良好的力学性能.SO3和BaO的掺入促进了硫铝酸钡钙矿物的形成,同时对阿利特在低温下形成及对贝利特矿物的活化起到了重要作用.     

硫铝酸锶钙矿物的研究

以硫铝酸盐水泥的主要矿物的硫铝酸钙(C4A3)为基础,用Sr2+对C4A3中的Ca2+进行取代,合成了新的水泥矿物——硫铝酸锶钙系列,研究了该系列矿物试样煅烧后的强度发展规律。结果表明:硫铝酸锶钙系列矿物试样经1300℃煅烧后的抗压强度明显高于硫铝酸钙,抗压强度最大的矿物组成为Ca1.50Sr2.50A3,其3d和28d抗压强度分别为76.6MPa和89.6MPa,用X射线衍射仪、扫描电子显微镜和差热分析仪等对熟料的形成和水化机理进行了初步分析,发现硫铝酸锶钙矿物水化产物主要是钙钒石(AFt),水化铝酸一钙(CAH10),Ca(OH)2以及Al2O3(aq)。     

B_2O_3和CaF_2对C_3S-C_(2.75)B_(1.25)A_3-C_2S-C_3A水泥熟料矿物体系力学性能影响

研究了B2O3和CaF2对C3S-C2.75B1.25A3S珚-C2S-C3A熟料矿物体系的组成、结构与力学性能的影响。研究结果表明:在该熟料体系中C3S,C2.75B1.25A3S珔,C2S和C3A的适宜含量分别为50%,10%,25%和15%,B2O3和CaF2的适宜掺量为2%和1.5%。在最佳组成和制备工艺条件下,合成的阿利特-硫铝酸钡钙水泥的1d,3d和28d抗压强度分别达到18MPa,48MPa和95MPa以上,展现了良好的早期力学性能。同时,掺加CaF2能有效降低熟料中游离氧化钙的含量,促进阿利特在低温条件下形成。利用SEM-EDS,XRD等测试手段对熟料的组成、结构及性能进行了分析。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

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。     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Semi-empirical equation of state of metals. Equation of state of aluminum

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. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

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%.     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

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.     

塔设备改造选型的分析

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）。     

Effect of degree of deacetylation of chitin on the properties of chitin crystallites

In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997