矿渣粉细度对其物理性能影响研究

试验研究了不同粉磨时间对矿渣粉细度及颗粒分布的影响以及不同细度矿渣粉对其物理性能的影响。结果表明:使用球磨机磨制矿渣粉时,如果粉磨时间过长,会因范德华力造成细颗粒相互粘连,粗颗粒增多,比表面积也不会无限提高;随着矿渣粉比表面积的提高,其早期活性(3d、7d)逐步提高,但后期活性(28d、90d)均在达到峰值(28d活性指数达到117%,90d活性指数达到110%)后有所下降;矿渣粉流动度比在比表面积处于350~700m2/kg之间时变化不大,在110%左右,但比表面积超出此范围时,无论升高还是降低,胶砂流动度均迅速下降。     

多功能高效矿渣添加剂的试验研究

针对矿渣易磨性差和早期强度偏低,研究含有羟基的多功能添加剂对矿渣的粉磨效率和掺矿渣水泥的物理力学性能。结果表明:该添加剂能有效的改善矿渣的细度、提高矿粉的比表面积、提高流动性和早期强度,当该添加剂掺量为0.035%时,矿渣细度提高43.8%,勃氏比表面积提高16.0%,水泥净浆流动度由130mm提高到180mm,矿渣水泥3d强度提高了3.3MPa。并在此基础上,探讨了该添加剂的作用机理。     

一次水泥磨细度跑粗的原因分析和处理措施

1异常现象我公司年产高铝水泥15万t,熟料粉磨系统为Φ3m×11m双仓高细磨,N750型O-Sepa选粉机,磨内单独通风除尘。水泥成品主要控制比表面积和45μm水筛筛余。2010年6月下旬,水泥成品比表面积为336m2/kg,但筛余突然变大至20%,并逐渐增加到26%,严重影响了水泥的产质量。     

粉煤灰-矿粉复合超细粉制备及其在水泥中的应用试验研究

将煤粉炉粉煤灰、循环流化床粉煤灰和S95矿粉分别进行超细粉磨，按照不同比例复合配制粉煤灰-矿粉复合超细粉，研究复合超细粉的粒度分布、活性指数和流动度比，以及复合超细粉替代一定比例成品P·O42.5水泥后水泥的标准稠度用水量、凝结时间和力学性能。结果表明，煤粉炉粉煤灰、循环流化床粉煤灰及矿粉分别经超细粉磨后，中位粒径分别为4.632 μm、2.611 μm和6.039 μm，循环流化床粉煤灰粒度更细。粉煤灰-矿粉复合超细粉的活性指数和流动度比均满足S95矿粉、甚至S105矿粉技术要求。粉煤灰-矿粉复合超细粉替代25%成品P·O42.5水泥，复合水泥标准稠度用水量和初凝时间略增加，复合水泥3 d和28 d抗压强度明显提高。     

国内粉煤灰的难磨占比试验统计

以45 μm筛筛余R45、比表面积S和粉磨时间t为依据,通过46例粉煤灰细磨试验表明,国标GB/T 1596规定的三个等级细度都容易达标,但Ⅰ级灰有30.4％的S不足400m2/kg;粉磨到700m2/kg时有50.1％的试样需耗时170～410min,难磨占比呈几何级增大,且有8.7％的试样无法达到;相同S的R45分...     

水泥助磨剂助磨效果的研究

试验选用常用的助磨剂A（丙三醇）、B、D三种不同的助磨剂,从水泥的45 μm筛筛余、比表面积、均匀性系数n、标准稠度用水量4个指标分别来评价三种助磨剂的助磨效果。结果表明,助磨剂的助磨效果可以通过水泥的45 μm筛筛余、比表面积、均匀性系数n进行表征,而用标准稠度用水量来评定效果不理想。     

宝钢Corex渣和常用矿渣性能的比较

研究了宝钢Corex矿渣和常用矿渣的物理性能、易磨性、活性和自身水硬性。结果表明,宝钢Corex渣和常用矿渣的化学成分比较接近。两种矿渣碱度均大于1,说明两者有较高的潜在水化活性。由于Corex渣具有较高的致密性、含铁率和容重,使得Corex渣的易磨性较常用矿渣差。此外,在细度接近时,宝钢Corex渣的自身水硬强度略高于常用矿渣,但Corex渣的早期活性指数明显高于常用矿渣,在比表面积为400~450 m2/kg时,Corex渣的早期(3 d、7 d)活性指数分别高于常用矿渣15%和20%以上,两者后期(28 d)活性相差不大。     

TRM型辊磨在赞比亚2500t/d水泥熟料生产线的应用

介绍了国产大型辊磨设备在中国建材赞比亚建材工业园2500t/d水泥熟料生产线的应用情况,该生产线使用的生料辊磨、煤辊磨和水泥辊磨均由中材(天津)粉体技术装备有限公司提供。TRMR38.4型生料辊磨出磨生料细度80μm筛筛余<12%,水分≤0.5%。TRMC23.2型煤辊磨出磨煤粉80μm筛筛余≤8%,水分≤1.5%。TRMK50.4型四辊水泥辊磨生产的CEMII/A-L42.5R水泥比表面积≥400m^2/kg时,45μm筛筛余≤4%;生产的CEMII/B-L32.5R水泥比表面积≥420m^2/kg时,45μm筛筛余≤7%。各辊磨运行稳定,技术指标均满足设计要求。     

水泥生产中45μm筛筛余指标优化试验

在“辊压机+V型选粉机+球磨机+高效选粉机”联合粉磨系统中出磨物料的45μm筛筛余量约20%～25%,将其按0%～10%比例掺入成品水泥中,保持水泥比表面积基本和成品水泥相同的情况下,试验找出最佳掺入量,可提高成品水泥中45μm筛筛余量,改善水泥工作性,提高产量,甚至可配制出符合GB175—××××《通用硅酸盐水泥》讨论稿中对45μm筛筛余量要求的水泥。     

矿渣微粉的研制及应用研究

矿渣微粉作砼掺合料，有着很好的应用价值。用试验小磨进行了不同比表面积矿粉的性能试验，同时进行了不同矿粉掺量砼的性能试验。结果表明：矿渣微粉的活性指数高，流动性好。生产矿渣微粉的最佳粉磨比表面积为450—500m^2／kg。另外用矿粉代替部分水泥后，砼28d抗压值接近甚至高于对比样；且砼流动性改善明显，1h塌落度损失少；同时还降低了砼的生产成本。所以矿渣微粉是配制高强高性能砼的优质掺合料。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

Abstract

Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed.     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.     

二甲基二烯丙基氯化铵和丙烯酰胺的合成及应用

用复合引发体系(过硫酸盐-偶氮类引发剂)和脂肪胺类氧化还原体系引发,在实验室获得了单体转化率≥98%,特性粘数高于13.6 dL/g的阳离子共聚物PDA,探讨了控制聚合物分子量的影响因素.