氨浸法从含砷粗氧化锌制活性氧化锌研究

在碱性氨浸法处理含有砷、铅的低级氧化锌制取活性氧化锌的工艺中，引入铁盐除砷方法，解决了氨浸法生产活性氧化锌中除砷的问题，对于含砷１％～２％的原料，产品中的砷含量可降低至０．０００５以下，本方法还为含砷的铜、镍、钴废料的利用提供了参考途径。     

氨法超细活性氧化锌工艺的中试

以锌焙砂为原料，开发了氨法生产超细活性氧化锌新工艺。把实验室氨法超细活性氧化锌工艺进行中试，净化工序摒弃了传统的高锰酸钾除铁锰，改为静置氧化除铁锰和二氧化铅深度除锰，提高了净化液技术指标。同时着重考察上述工艺工业化的各项技术经济指标，优化了工艺路线，为建厂做好技术准备工作。     

氨配合法制活性氧化锌除杂净化过程研究

本文对氨水－碳酸氨作浸取液以粗氧化锌为原料制活性氧化锌的除杂净化过程进行了研究。氨配合法生产活性氧化锌深度除杂净化中，以H2O2作氧化剂深度除锰，以（NH4）2S为沉淀除杂剂深度除铜，使低品位的原料浸取液得以净化。     

饮用水除砷吸附剂的研究进展

砷在水体中主要以As(Ⅲ)和As(Ⅴ)的无机酸形式存在,对人体的危害很大,吸附法是国内外研究最广泛的饮用水除砷技术之一.详细说明了饮用水除砷的吸附剂类型,指出:复合材料效率高、费用低,目前应用最为广泛;纳米材料与砷结合后性质稳定,除砷效率最高,是今后的主要发展方向;生物吸附材料以其高吸附率、低成本成为研究的热点.     

氨—碳酸铵法生产活性氧化锌工艺研究

本文是利用氧化锌易溶于氨—碳酸铵混合溶液中生成锌氨络合溶液的这一特性,以低级氧化锌或锌焙砂为原料,生产活性氧化锌工艺的研究。     

氨法制取纳米氧化锌的粒径控制研究

为有效控制氨法制取纳米氧化锌的粒径,在蒸氨前将浸出原液用一定量的纯净水稀释,可增加初期沉淀生成的晶核数,使沉淀粒径更加均匀和细化,同时发现蒸氨残液不可以作为浸出原液的稀释剂回用.蒸氨的加热方式对纳米氧化锌的粒径也有影响,选择蒸汽直接加热,当溶液含锌质量浓度小于0.3 g/L时,所制取的纳米氧化锌粒径满足GB/T 19589-2004纳米氧化锌的要求 .     

黄磷除砷工艺条件的选择及应用

本文介绍了黄磷除砷的低温氧化法,用正交法选出了最佳工艺条件,经生产实践标明本方法有很好的除砷效果和磷的回收率,除砷率最高可达９１．５％,磷收率达９５％。     

三氯化铁除砷的工艺研究

为了减少铁盐除砷过程中产生的危险废渣的数量,研究了三氯化铁作为除砷剂处理砷(Ⅲ)和砷(Ⅴ)废水的工艺条件,主要包括pH值、铁砷摩尔比(nFe/As)、反应时间等.结果表明,用三氯化铁处理含砷(Ⅲ)1647.8 mg·L-1废水的最佳工艺条件为:pH=9、反应时间1h、nFe/As=2；处理含砷(Ⅴ) 3697.2 mg· L-1废水的最佳工艺条件为:pH=8、反应时间1h、nFe/As=2.此外,阳离子型絮凝剂PAM209cc适合于铁砷沉淀物的沉降,对砷(Ⅲ)废水和砷(Ⅴ)废水的最佳投加量分别为40 mL· L-1、20 mL· L-1.     

沉淀-絮凝法处理低砷矿坑水的研究

采用沉淀-絮凝法处理低砷矿坑废水,试验研究了沉淀剂种类,用量等因素对除砷效果的影响。结果表明,在适应操作条件下,选择明矾作为沉淀剂,处理后废水中砷浓度小于0.05mg/L,符合国家地表水环境质量标准（GB3838-2002）。该方法经济合理,有较好的工程应用价值。     

氨浸法制取活性氧化锌新工艺研究

通过该厂具体的生产实践,介绍一种新的生产活性氧化锌的工艺——氨浸法,该法用含氧化锌75%的原料,生产活性氧化锌,工艺简单,污染小。一、前言本研究是在中型试验的基础上进行的工业性扩大生产试验。     

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。