秦岭地区某页岩型钒矿中钒的赋存状态研究

通过对秦岭地区寒武纪某页岩型钒矿进行详细的工艺矿物学研究,基本查明了样品中钒的赋存状态和分布规律,分析了矿石工艺性质对选别工艺的影响.样品含0.94％ V2O5,主要矿物为石英(61.7％)、粘土(27.8％)、云母(3.3％),次要矿物为褐铁矿(1.1％)、黄铁矿(1.9％)和重晶石(0.9％).平衡配分结果表明,钒主要赋存于粘土矿物中,其中粘土矿物、云母、褐铁矿和石英的分布率分别为86.25％、8.93％、3.6％和1.22％.各矿物V2 O5配分总量为1.01％,与实际分析品位0.94％接近.样品中86.25％的钒赋存于粘土矿物中,应将粘土矿物作为选钒的载体矿物,并充分利用粘土和石英二者硬度和比重的差异来进行钒的富集.对于此类粘土型钒矿,建议采用阶段磨矿-阶段擦洗-磁选的工艺流程.     

玻璃组成对Li_2O–Al_2O_3–SiO_2微晶玻璃热膨胀系数的影响(英文)

通过传统熔融法制备了具有低膨胀系数的Li2O-Al2O3-SiO2(LAS)微晶玻璃.利用扫描电镜、X射线衍射、差热分折及热膨胀系数测定等分 析手段,研究了玻璃组成中Li2O,Al2O3,SiO2的含量对微晶玻璃热膨胀系数的影响.结果表明:在标准样品的基础上,Li2O的含量对热膨胀系数影 响很大:Li2O的含量提高,由于形成β-锂辉石,微晶玻璃的结晶程度增加与晶粒尺寸增大,导致热膨胀系数增大.与此相比较,Al2O3和SiO2成分 的变化对膨胀系数的影响较小.当玻璃组成(质量分数,下同)为4%～6%Li2O,16%~18%Al203,66%~68%Si02时,Li2O-Al2Oy-SiO2玻璃的膨胀 系数为-1.5～1.5×10-7/℃(0~700℃)     

稀土La_2O_3对Li_2O-Al_2O_3-SiO_2微晶玻璃结构和性能的影响

本文主要研究添加微量稀土La2O3对Li2O-Al2O3-SiO2微晶玻璃晶相组成、显微结构、抗折强度的影响。研究结果表明:添加微量La2O3有利于Li2O-Al2O3-SiO2微晶玻璃中的主晶相β-锂辉石发育成完整的柱状、板状晶体,提高了微晶玻璃的抗折强度。     

某萤石矿工艺矿物学特征研究

萤石是现代氟化工的基础原料,为了综合利用甘肃某矿区萤石矿,采用化学分析、XRF、AMICS(矿物特征自动定量分析系统)、扫描电镜分析等方法,对该地区萤石矿的化学成分、矿物组成、矿物嵌布特征、有价组分的粒度和赋存状态以及单体解离度等进行了系统的工艺矿物学研究,结果表明:该萤石矿中有用矿物为CaF2,质量分数为5.10％;...     

火山岩型铀多金属矿工艺矿物学研究

为了查明广东某火山岩型铀多金属矿矿的工艺矿物学性质,采用化学分析、X射线衍射、MLA等技术手段,对矿石的多元素成分、矿物组成以及铀的赋存状态进行了系统研究.研究表明:该矿石中蓝钼矿、晶质铀矿等矿物含量较高,是主要有用矿物,矿石样品中铀含量为X％,钼含量为0.085％,其他矿物含量较低综合利用价值不大.     

锂辉石在中性硼硅玻璃中的应用研究

以锂辉石中的Li2O等量替代中性硼硅玻璃(简称5.0医药玻璃)化学组成中的Na2O和B2O3,研究Li2O对工艺性能和节能减排的影响。研究结果表明:Li2O具有较好的助熔效果,可以显著降低玻璃高、低温黏度特征点所对应的温度;当0.20%～0.30%(质量分数)Li2O替代Na2O时,5.0医药玻璃拉管工艺性能达到最好,0.20%Li2O替代B2O3时,其拉管工艺性能最好。因此,锂辉石对中性硼硅玻璃具有显著的节能减排效果,并能显著提高其拉管工艺性能。     

硅质胶磷矿选矿工艺试验研究

针对贵州省织金地区以玉髓形式存在的硅质胶磷矿,通过矿石工艺矿物学研究,查明了矿石中主要的矿物存在形式。有用矿物为碳氟磷灰石,占矿物组成的55.01%。脉石矿物主要为硅质矿物,其中以玉髓为主,占31.42%;云母次之,占8.9%;而石英仅占1.13%。对矿样分别开展了正浮选、反浮选、反正联合浮选、脱泥—正浮选、超声波强化药剂分散等工艺的脱硅试验研究,得出了正浮选+超声波强化药剂分散的联合工艺为最适合于以玉髓形式存在的硅质胶磷矿的选矿工艺的结论。     

云南某含铁磷矿可选性实验研究

为提高云南某含铁磷矿资源的综合利用率,通过洗矿—磁选—浮选联合工艺对该矿进行了综合回收磷、铁矿物实验.结果表明,该工艺可获得高质量的磷精矿产品,磷精矿w(P2O5)可达35％以上,浮选作业P2O5回收率可达85％～90％.     

三价铁盐沉淀-Fenton联合工艺处理HEDP预镀铜废水

采用三价铁盐沉淀-Fenton氧化联合工艺处理湖南某电镀厂羟基亚乙基二膦酸(HEDP)预镀铜废水,研究了三价铁盐沉淀阶段pH、Fe3+投加量、反应时间及Fenton反应阶段pH、H2O2投加量、m[Fe2+]/m[H2O2]、反应时间等因素对处理效果的影响.结果表明,采用三价铁盐沉淀-Fenton氧化工艺能有效处理HEDP预镀铜废水;在优化反应条件下,TP、COD和Cu2+去除率分别达到99.97％、97.88％和99.87％,出水优于电镀污染物排放标准(GB 21900-2008)要求.     

Li2O-Al2O3-SiO2系低膨胀微晶玻璃的研究

本文以Li2O-Al2O3-SiO2(LAS)系统为基础玻璃成分，锂辉石、高岭土、石英砂、滑石等矿物和部分化学试剂为主要原料，采用熔融法制备了LAS系低膨胀微晶玻璃。运用XED和SEM等现代测试分析手段对材料的晶相和显微结构进行了观察和分析，并讨论了不同的Li2O、Al2O3、SiO2之比和不同的晶核剂对析出主晶相的影响。实验表明，所制微晶玻璃的主晶相为β-锂辉石固溶体，晶粒尺寸为0.5～2μm，材料不透明，其抗折强度为80～108MPa。     

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.     

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.     

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.     

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.     

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。