浅谈尾矿微晶玻璃的制备方法和应用

由于微晶玻璃具有优越的综合性能,它已在许多领域得到广泛的应用。为了有效综合利用尾矿资源,本文概述了尾矿微晶玻璃的研究现状,重点介绍了尾矿微晶玻璃的制备方法、工艺和性能,并对尾矿作为制备微晶玻璃原料的应用前景进行了展望。     

尾矿废渣微晶玻璃

尾矿废渣的日积月累给人类的生态环境带来了巨大的压力,加速对其综合利用已近在眉睫。本文简要介绍了用尾矿废渣制备具有高附加值的微晶玻璃的工艺技术,讨论了工业废渣和尾矿尾砂中部分化学成分对微晶玻璃制备工艺和性能的影响,还对尾矿废渣微晶玻璃的研究概况和应用前景进行了评述。     

尾矿废渣微晶玻璃

尾矿废渣的日积月累给人类的生态环境带来的巨大的压力,加速对其综合利用已迫在眉睫,本文简要介绍了用尾矿废渣制备具有高附加值的微晶玻璃的工艺技术,讨论了工业废渣和尾矿尾砂中部分化学成分对微晶玻璃制备工艺和性能的影响,还对尾矿废渣微晶玻璃的研究概况和应用前景进行了评述。     

与环境协调的材料——尾矿废渣微晶玻璃

尾矿废渣的日积月累给人类的生态环境带来了巨大的压力，加速对其综合利用的步伐已迫在眉睫，本文简要介绍了用尾矿废渣制备具有高附加值的微晶玻璃的工艺技术，讨论了工业废渣和尾矿尾砂中部分化学组成对微晶玻璃制备工艺和性能的影响，对尾矿废渣微晶玻璃的研究概况和应用前景进行了评述。     

工业固体废弃物作为合成微晶玻璃原料的开发和利用

概述了以工业废渣、尾矿尾砂、冶炼炉渣等工业固体废弃物为原料制备微晶玻璃的研究现状.对固体废弃物作为制备微晶玻璃原料的前景进行了展望,指出利用页岩残渣制备微晶玻璃的研究将开辟页岩残渣综合利用的新途径.     

微晶泡沫玻璃与固体废弃物的循环利用

概述了微晶泡沫玻璃的制备工艺原理及流程,从结构方面讨论了微晶泡沫玻璃的性能及应用,介绍了废玻璃、粉煤灰、尾矿、冶炼渣、硼泥、煤矸石、陶瓷废料等固体废弃物在微晶泡沫玻璃中的应用。     

利用工业固体废弃物制备微晶泡沫玻璃的研究现状及展望

工业固体废弃物在一定程度上属于可以重新利用的资源,其综合利用问题一直备受国内外学者关注.分析了利用工业固体废弃物制备微晶泡沫玻璃的可行性.综述了以粉煤灰、煤矸石、废玻璃、高炉渣、尾矿和油页岩渣等工业固体废弃物为原料制备微晶泡沫玻璃的国内外研究进展,以期为相关科学研究工作和工业化生产提供参考和借鉴.总结了目前利用工业固体废弃物制备微晶泡沫玻璃亟待解决的问题.     

冶金工业废弃物微晶玻璃的研究概况

冶金工业是重要的原材料工业部门,随之产生了大量的固体废弃物,给自然环境造成了巨大的压力.以冶金固废制备微晶玻璃是冶金资源综合利用的一个重要途径.简要介绍了微晶玻璃的析晶行为及热处理工艺.综述了利用多种冶金固废制备微晶玻璃的研究概况.总结冶金固废微晶玻璃研究目前存在的不足及以后应着重的方向.     

CaO-MgO-Al2O3-SiO2系铜尾矿微晶玻璃析晶特征研究

以铜尾矿为主要原料,采用压延法开展玻璃熔制实验制备CMAS系基础玻璃,进行玻璃微晶化及稳定性等方面的研究.利用差热分析(DSC)、X衍射分析(XRD)、扫描电镜(SEM)等方法系统研究了微晶玻璃组分、热处理温度和时间等因素对玻璃析晶的影响.完成了以透辉石(Ca(Mg,Al)(Si,Al)2 O6)为主晶相的微晶玻璃制品实验配方及制备工艺方案,确定了热处理制度为900℃保温2 h的最佳工艺参数,制备的微晶玻璃力学性能优于市场同类产品.     

利用锂辉石尾矿研制低膨胀微晶玻璃

利用新疆可可托海锂辉石矿尾矿研制出了低膨胀微晶玻璃,用尾矿代替部分常规原料能够降低原料成本,降低熔化温度,为尾矿综合利用开辟了新的途径.通过实验探讨了低膨胀微晶玻璃的成分、热处理制度与其性能之间的关系.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

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.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.