磁—浮联合工艺回收重晶石选矿试验研究

针对广西某铅锌尾矿中重晶石含量低、白云石含量高的特点,开展了重选工艺和磁选-浮选联合工艺回收重晶石试验研究。结果表明,磁选-浮选联合工艺获得了较好的选别指标,对BaSO_4品位为13.52%的铅锌尾矿,采用高梯度磁选可预先抛除35.27%的脉石矿物,浮选采用酸化水玻璃作抑制剂、十二烷基磺酸钠作捕收剂,闭路试验获得了BaSO_4品位为92.16%、回收率为79.36%的重晶石精矿。该工艺有效地回收了铅锌尾矿中的重晶石,实现了资源的综合利用。     

某大型钼尾矿强化回收铜精矿的试验研究

本文基于某大型铜钼矿浮选的钼尾矿进行铜精矿的强化回收研究,开发出一套合理工艺来提高钼尾矿中铜精矿的充分回收。通过多元素及岩矿分析,钼尾矿中铜品位为1.075%,硫化铜占比97.81%,含铜矿物呈微细粒连生导致回收困难。通过磨矿和浮选试验确定再磨细度-0.038mm占89%,采用氧化钙、丁基黄药、2#油的药剂制度,制定一粗三精二扫工艺,获得铜精矿产率为5.78%,铜品位为21.15%,回收率为72.86%的良好指标,满足三级品铜精矿的质量要求。     

辽宁某含金铁矿石综合回收的选矿试验研究

辽宁省本溪市某铁矿在生产过程中发现含有金,原矿含金品位为1.47g/t,含铁品位为18.82%。通过浮选回收金+磁选回收铁的联合工艺流程,获得了比较理想的选矿工艺指标。试验矿石在磨矿细度为-0.075mm占65%的条件下,采用硫酸铜作为金载体矿物的活化剂,丁基黄药和丁铵黑药作为捕收剂,采用一次粗选三次精选二次扫选的浮选工艺流程,试验取得的工艺指标为,金精矿含金品位为50.85g/t,金回收率为75.49%。浮选尾矿进行湿式弱磁场回收磁铁矿,粗精矿再磨至细度为-0.075mm 97%再选得铁精矿,试验取得的工艺指标为,铁精矿含铁品位为65.52%,铁回收率为29.42%。     

超贫钒钛磁铁矿综合回收铁磷选矿工艺研究

对某地超贫钒钛磁铁矿中的铁及伴生磷进行了弱磁选回收铁、浮选回收磷的试验研究。结果表明,原矿在第一段磨矿细度为-200目占50%、第二段磨矿细度为-200目占80%的条件下,通过弱磁选可获得铁品位64.42%、回收率为55.45%的铁精矿;磁选尾矿经一次粗选三次精选一次扫选,可获得品位P2O535.36%、回收率93.83%的磷精矿。     

铁尾矿综合回收磷钛的试验研究

对某地铁尾矿进行了回收磷和钛的试验研究。结果表明,原矿在-200目占52.14%的磨矿细度条件下,进行1次粗选3次精选的开路浮选试验,可得到P2O5品位为31.58%、回收率为84.21%的磷精矿,磷浮选尾矿再磨至-200目占75.18%后通过强磁选—浮选可获得品位为48.19%、回收率为42.96%的合格钛精矿。     

孙村选煤厂二次浮选工艺改造实践

孙村选煤厂针对浮选工艺现状及系统存在的问题，对原浮选工艺进行了改造，采用浮选机与浮选柱联合二次浮选工艺，并采用高频叠筛回收精煤磁选尾矿，充分发挥了各设备的优势，降低了浮选精煤灰分，取得了良好的工艺效果。     

某铁尾矿中磷灰石的低温浮选回收试验研究

对我国某铁尾矿中伴生的磷灰石进行了综合回收试验研究,采用新型、高效的AW系列浮选捕收剂实现了磷的低温浮选。试验结果表明,在矿浆温度为15℃的条件下,对含P2O56.22%的选铁尾矿,通过一粗一扫浮选流程获得了P2O5品位为34.56%、回收率为88.46%的优质磷精矿,试验结果为实现该尾矿中磷灰石的有效回收提供了参考依据。     

回收某磁铁矿尾矿中铁的试验研究

某铁矿是一座贫磁铁矿矿山,矿石经三段一闭路破碎、阶段磨矿、阶段磁选的选矿工艺,尾矿全铁品位8%左右,磁性铁品位0.9～1.0%。该铁矿选矿厂利用实验室设备,针对矿石性质,制定了尾矿分级选别和尾矿强磁抛尾两组试验,探索尾矿中含铁矿物回收。试验结果表明,尾矿经强磁抛尾-磨矿-离心重选流程分选,最高能获得铁精粉品位为20%左右,综合回收率为25.36%。     

从云南某高硫铅锌矿尾矿中综合回收锌的试验研究

云南某高硫铅锌矿尾矿平均含Pb 0.84％、Zn 3.67％,综合回收价值较高,其中含铅矿物主要为方铅矿和白铅矿,含锌矿物主要为闪锌矿和菱锌矿.实验室选矿试验研究表明,采用"硫化矿优先浮选-浮硫尾矿脱泥-氧化锌浮选"工艺可较好地实现尾矿中有价矿物的高效回收,进一步研究发现在氧化锌浮选过程中,粗选和扫选分别采用不同碳链长...     

屯兰选煤厂提高尾煤泥灰分和精煤回收率的改造实践

经技术检查和试验检测,屯兰选煤厂原煤泥水系统工艺设计中因主厂房扫地水、中矸磁选尾矿、浮选尾矿等煤泥水直接流入浓缩池,导致尾煤泥灰分偏低;为解决这一问题,采取主厂房扫地水就近回收利用、提高磁选机回收效率等措施,有效提高了全厂精煤产率和尾煤泥灰分,降低了尾煤泥发热量,实现了企业经济效益最大化。     

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。