煅烧温度对水泥熟料主要矿物形成的影响

选取SP窑硅酸盐水泥熟料、NSP窑硅酸盐水泥熟料和低热水泥熟料在1350℃、1450℃和1500℃三种温度下进行煅烧,对每种熟料在不同温度煅烧下的样品进行XRD定性、定量分析和岩相分析.研究结果表明,高温煅烧后熟料中C3S主要以M1型和M3型存在,R型C3S不明显,未发现T型C3S.此外,煅烧温度的变化对熟料中各矿物晶型和含量影响较大.随温度升高,硅酸盐矿物中C3S总体含量通常提高,C2S含量降低;三种熟料中的C3A都呈减少趋势,而C4AF则呈增加趋势,总矿物在最高温度1500℃时达到最大值.随温度升高,矿物存在不同程度的晶型转变,通常M1型C3S向M3型C3S转变.不同温度下熟料的岩相也不同,比较各熟料岩相分析结果与XRD分析结果相吻合.     

微波煅烧硅酸盐水泥的研究

用微波在1370℃,1400℃,不同生料组成下煅烧了硅酸盐水泥,并与在1450℃的电炉煅烧进行了比较.结果显示:微波煅烧比电炉煅烧的温度至少降低50℃,煅烧时间减少约70%.微波煅烧(1400℃,10min)水化活性优于电炉煅烧(1450℃,30min),强度也提高.同种生料,两种不同煅烧模式得到的熟料中,其四大矿物(C3S,C2S,C3A,C4AF)是相同的,阿利特相结构都属于Ⅲ型和Ⅰ型单斜晶系,但微波煅烧的熟料中硅酸盐矿物(C3S+C2S)总含量提高了约10%,晶体的尺寸较小且比例较高,中间相(C3A+C4AF)的含量降低了约10%,黑色中间相的尺寸有增大趋势.结果还表明,适宜的组成有利于微波烧成硅酸盐水泥,并且其矿物形成过程也不同于电炉煅烧.     

易磨硅酸盐水泥熟料的研究

研究了一种容易粉磨硅酸盐水泥熟料的组成、粉磨特性与物理性能。这种容易粉磨硅酸盐水泥熟料可以在假烧温度低于1400℃的条件下烧成。其矿物组成与普通硅酸盐水泥熟料相同，但具有C3S含量高(＞70％)的特点。在水泥熟料粉磨至比表面积320m^2/kg条件下，容易粉磨硅酸盐水泥熟料需要粉磨4．5min，而普通硅酸盐水泥熟料需要粉磨8min。容易粉磨硅酸盐水泥熟料的3d抗压强度可达37MPa，28d抗压强度可达60MPa。     

高硅酸盐水泥熟料煅烧的试验研究

本文从生料易烧性人手,研究了氟硫复合矿化剂对高硅酸盐矿物含量水泥熟料煅烧的影响.利用XRD及XRF对易烧性较好且C3S含量较高的熟料进行了矿物组成及硫含量分析.研究结果表明:在添加氟硫复合矿化剂的条件下可煅烧获得硅酸盐矿物含量大于90％且C3S含量大于70％的高硅酸盐水泥熟料.熟料中f-CaO含量随饱和比LAD的增加而增加,随助溶剂量QLP的增加逐渐减少,随硫过量系数EC的增加而略微升高.熟料中的主要矿物C3S和C2S形成情况良好.     

白色硅酸盐水泥熟料及结球料的矿物组成分析

白色硅酸盐水泥(简称白水泥)是装饰用的特种水泥。白水泥熟料的石灰饱和系数和通用硅酸盐水泥熟料相差不大,但硅率较高(一般在3.5~5.0),铝率很高。这种低铁、高硅、高饱和比的熟料,要求煅烧温度达　1 500℃以上,为降低烧结温度,在生料中必须加入少量矿化剂,最常用的矿化剂是萤石,其掺量控制在0.5%之内。白水泥熟料矿物组成范围为：C3S (55%~60%),C2S (20%~30%),C3A (12%~14%),C4AF(<1%)。     

磷尾矿作原料在水泥生产中的工业试验分析

为合理开发利用日益剧增的磷尾矿工业废渣,本文将磷尾矿应用于水泥生产中。用磷尾矿取代部分原料配制生料,在工业窑进行了试生产,并通过XRD、TG-DTA、岩相、SEM-DES分析方法,与普通硅酸盐水泥熟料进行对比。结果表明:磷尾矿作为原料制备硅酸盐水泥熟料,可以降低生料中碳酸钙的分解温度;减少熟料中的游离氧化钙含量,显著改善了生料的易烧性。掺磷尾矿熟料晶型形貌较好,MⅠ型的C3S和β-C2S的含量有所增加,这有利于熟料早期和后期强度的提高。磷元素在B矿中的富集最多。但由于磷尾矿本身磷含量波动大且试验工厂工业均化效果不佳,实际生产熟料质量产生一定的波动。     

大冶铜尾矿配制高强低能耗水泥的研究

以大冶铜尾矿和部分纯化学试剂为原料，在实验室配料、煅烧高铁和普通硅酸盐水泥，并用岩相、ＸＲＤ等手段进行分析研究。分析表明，由于大冶铜尾矿中ＳＯ_３含量低，尽管显示一定的矿化作用，但效果不明显。但所配制的水泥，特别是掺尾矿达２４％时配制的高铁水泥，具有早强、后期强度高和煅烧温度低的特点。分析认为是铜尾矿中微量元素固溶于熟料矿物中增加矿物结构缺陷，从而提高熟料矿物的水化活性和熟料强度。     

不同熟料矿物含量的水泥对混凝土部分性能的影响

研究了不同熟料矿物含量的水泥对配制混凝土抗疲劳、抗冲击和耐磨性能的影响。结果表明,当熟料中硅酸盐矿物C2S、C3S含量接近时,随着熟料中Fe2O3含量的增加,C4AF含量增加,C3A含量降低,所配制混凝土在28d和90d龄期的抗疲劳、抗冲击和耐磨性能都依次提高;在保证熟料中适量C3S满足强度要求和熔剂矿物C3A、C4AF含量接近的前提下,低C3S高C2S含量的水泥配制的混凝土抗疲劳、抗冲击和耐磨性能都优于高C3S低C2S含量的水泥配制的混凝土。即：在保证足够C3S含量满足强度要求、熔剂矿物含量为19%～20%时,适当提高C4AF和C2S含量对提高混凝土的上述性能是有益的。     

基于CaO-SiO2-Al2O3-Fe2O3-SO3系统的水泥熟料矿物研究

采用石灰石、硬石膏、粉煤灰、硅石为原料,研究了固定铝硫比（P=3.82）条件下,氧化铝含量为10%时,碱度系数和煅烧温度对CaO-SiO2-Al2O3-Fe2O3-SO3系统水泥熟料矿物烧成的影响。结果表明,碱度系数为1.2,煅烧温度范围为1375~1425℃时制得的水泥为高贝利特硅酸盐水泥;C4A3S分解生成了C3A,而非C12A7;在SO3和C3A存在的条件下,促进C3S在低温下形成,部分C3S在高温下分解为α＇-C2S;水泥熟料的矿物形貌未发生明显的变化。     

钼尾矿制备贝利特水泥熟料早期性能研究

本文以钼尾矿为主要原料制备贝利特水泥熟料.并通过强度、X射线衍射、扫描电镜等测试,研究了原料配比和石膏活化剂掺量对水泥熟料性能的影响.实验结果表明:以质量分数为23.3％钼尾矿、3.4％的河砂和73.3％的石灰石为原料,再添加1.5％的石膏作活化剂,在1350℃下煅烧0.5h制得的贝利特水泥熟料强度最高.钼尾矿的掺加对贝利特水泥熟料主要矿物种类没有影响.加入石膏可促进熟料烧成,且生成了少量硫铝酸钙,使得熟料强度明显增加.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料，介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比，介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序，对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.