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通过单矿物浮选实验、动电位、吸附量及红外光谱测试分析,考察了蓝晶石、石英、黑云母的浮选行为以及矿物与药剂的作用机理。浮选实验结果表明,在中性条件下,单独用十二胺盐酸盐(DAC)作捕收剂,3者可浮性差异不大,不能有效分离,必须添加抑制剂。3种抑制剂在相同的质量浓度下,对蓝晶石矿物的抑制强弱顺序为:淀粉水玻璃氟化钠。金属阳离子的添加对3种矿物的浮选影响也不同,对蓝晶石及石英的抑制强弱顺序为:Al 3+Fe3+Mg2+Ca2+,对黑云母的抑制顺序为Ca2+Mg2+Al 3+Fe3+,黑云母总体趋势变化不明显。动电位、吸附量及红外光谱分析表明,淀粉在蓝晶石表面的吸附为物理吸附,并且主要通过氢键作用来实现,这样淀粉对蓝晶石具有更强的抑制能力,能有效地实现蓝晶石矿物的反浮选分离。 相似文献
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通过沉降试验、吸附量测试和Zeta电位测试,研究壳聚糖对微细粒蛇纹石的分散及絮凝作用,并考察其作用机理.结果表明:蛇纹石的沉降受pH值影响较大,在pH =9时沉降较快.壳聚糖对蛇纹石的絮凝作用受pH影响较大,在pH值为3时,壳聚糖溶解在水中,通过氢键作用吸附在蛇纹石表面,吸附量较低,对微细粒蛇纹石产生分散作用,使其沉降速度降低;pH值为9时,壳聚糖从溶液中析出,沉积在蛇纹石表面,吸附量较大,从而使微细粒蛇纹石形成较大的絮团,沉降速度较快并在底部形成体积较大的沉降体.当沉降体的pH值从9变为3时,沉积在蛇纹石表面的壳聚糖重新溶解,絮凝作用消失,蛇纹石絮团分散,蛇纹石颗粒在自身重力作用下继续沉降,使沉降体体积降低,含水量也降低. 相似文献
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通过单矿物试验、人工混合矿分离试验研究了酸性水玻璃、单宁酸、酸性水玻璃+单宁酸对重晶石、白云石浮选的影响。单矿物试验结果表明,以HN-1作为捕收剂的浮选体系中,酸性水玻璃+单宁酸用量达到60mg/L时,白云石回收率为17.10%,明显低于使用单一抑制剂的白云石回收率,表明使用组合抑制剂可更强烈地抑制白云石,同时对重晶石可浮性影响较小。人工混合矿分离试验结果表明,在酸性水玻璃+单宁酸用量为54mg/L+6mg/L的条件下重晶石与白云石的浮选分离指标最好,其中泡沫精矿含BaSO_493.81%、CaCO_36.02%,BaSO_4回收率为95.48%;产品的扫描电镜分析结果表明,该条件下重晶石泡沫精矿中的白云石仅为少量的被重晶石包裹的微细粒态白云石,表明使用组合抑制剂的抑制效果远优于单一抑制剂。 相似文献
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通过浮选试验、Zeta电位测试、SEM-EDS测试、X射线光电子能谱(XPS)测试研究了氟化钠在蛇纹石/黄铁矿体系中的作用机理。蛇纹石是硫化铜镍矿中的主要脉石矿物,不仅会抑制硫化矿物的浮选,而且会进入浮选精矿使后续的冶炼成本增加,因此需要利用氟化钠来消除蛇纹石对黄铁矿浮选的不利影响。研究结果表明,氟化钠可以显著改变蛇纹石的表面电位,使蛇纹石和黄铁矿由原来的静电吸引变为静电排斥,使黄铁矿在蛇纹石存在条件下的浮选回收率由41.2%提升至82.5%。其机理是氟化钠可以与蛇纹石表面的Mg(OH)_(2)反应生成MgF_(2),减少蛇纹石表面暴露的Mg^(2+),从而改变蛇纹石的表面电位,提高黄铁矿的浮选回收率。 相似文献
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针对泡沫钻井过程中井壁失稳问题,采用Waring-Blender法、滚动回收实验以及硬度测试,通过对发泡剂、稳泡剂以及胺类泥页岩抑制剂的优选,筛选出发泡性能优越,抗温、抗污染能力强,且具有强效持久抑制性能的胺类强抑制泡沫钻井液。同时,借助红外光谱与XRD分析手段,分析胺类泥页岩抑制剂抑制作用机理。结果表明,低分子胺类聚合物能进入黏土晶层,阻止水分子进入并水化黏土。高分子胺类聚合物由于相对分子质量大,不能有效地进入黏土晶层,因此主要吸附于黏土表面,形成分子保护膜,防止周围流体中水分子的进一步侵入。由于胺类聚合物通过提供多重阳离子吸附于黏土矿物上,因此能保持长久性黏土稳定且不易于逆转吸附,从而具备持久抑制性能。 相似文献
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M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
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. 相似文献
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Cheng-Le Zhao Shane Porzio Alan Smith Haiyan Ge H. T. Davis L. E. Scriven 《Journal of Coatings Technology and Research》2006,3(2):109-115
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. 相似文献
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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. 相似文献
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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. 相似文献
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中蓝晨光化工研究院有限公司《塑料工业》编辑部 《塑料工业》2009,37(3)
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. 相似文献
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中蓝晨光化工研究院《塑料工业》编辑部 《塑料工业》2007,35(3):1-25,67
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。 相似文献