新型捕收剂在沙特某低品位胶磷矿浮选中的应用

利用新型捕收剂,采用单一反浮选的方法对沙特某低品位胶磷矿进行浮选试验,考察了磨矿细度、浮选时间、抑制剂和捕收剂用量对精矿P2O5品位和P2O5回收率的影响.结果表明,当原矿P2O5品位为19.60％,磨矿细度-0.074 mm占60％,浮选时间1.5 min,抑制剂用量11.09 kg/t,捕收剂用量1.0 kg/t时,可以获得P2O5品位32.23％、P2O5回收率86.86％的磷精矿.     

用于磷矿浮选的不同聚合度AEO增效棉油酸皂的性能研究

为了探究不同聚合度脂肪醇聚氧乙烯醚(AEO)对棉油酸皂的增效作用,通过单一正浮选流程考察了不同聚合度AEO增效棉油酸皂的最佳配比,并筛选出增效作用最强的AEO-5与棉油酸皂复配成捕收剂用于宜昌磷矿浮选。试验结果表明:AEO对于棉油酸皂浮选有明显增效作用,不同聚合度AEO相比棉油酸皂浮选时磷精矿品位提高1.14%~2.91%,产率提高14.38%~30.15%,回收率提高19.19%~41.79%,选矿效率提高4.81%~11.64%。AEO-5复配比为10%且用量为1.4kg/t时,在所有不同聚合度AEO中其增效作用最强,将按此比例复配棉油酸皂获得的捕收剂ZLX-28用于本试验。在磨矿细度为-0.074mm质量分数占75.5%,粗选碳酸钠用量为7kg/t,水玻璃用量为3kg/t,捕收剂用量为1.24kg/t,扫选捕收剂用量为0.3kg/t,反浮选粗选硫酸用量为12kg/t,磷酸用量为1kg/t,反浮选捕收剂用量为0.52kg/t,扫选硫酸用量为2kg/t的条件下,进行了正浮选1粗1精1扫,反浮选1粗1扫的闭路流程试验,结果能够将磷矿品位从19.97%提高到30.48%,回收率达到89.58%。     

贵州某中低品位磷矿石浮选试验研究

为了考察工艺条件对贵州某中低品位磷矿石浮选的影响,本文系统地研究了磨矿细度、抑制剂和捕收剂用量对浮选指标的影响,结果表明:磨矿细度为-0.074mm占77.18%时,采用一粗一精的反浮选工艺流程,在粗选H_2SO_4和捕收剂FAS用量分别为10kg/t和1.6kg/t,精选H_2SO_4和捕收剂FAS用量分别为3.33kg/t和0.4kg/t,表面活性剂BMH-2用量为捕收剂用量的15%的条件下,对于P_2O_5品位为24.05%、MgO品位为6.11%的原矿,获得的磷精矿P_2O_5品位和回收率分别为31.36%和92.59%,MgO品位0.97%,达到了酸法加工磷矿石中的一等品(Ⅰ)的要求。     

江西某钼矿选矿试验研究

分析了江西某钼矿的有用矿物组成及粒度特征,通过试验确定了该矿物浮选分离的合适磨矿细度、粗浮选合适的捕收剂MG的用量、1次精选的抑制剂水玻璃和Na2S的用量、并采用"钼优先浮选+钼粗精矿再磨精选+黄铁矿浮选"的流程进行了试验,最终获得了钼品位46.62%,回收率86.32%的钼精矿;硫品位41.79%,回收率94.19%的硫精矿。     

利用微量捕收剂工艺从某尾矿中回收硫

研究采用正交试验方法,利用微量捕收剂工艺从某尾矿中回收硫,并对正交试验结果进行了极差分析和方差分析。结果表明,DHN的用量是影响硫粗精矿品位的最显著因素,浮选时间是影响硫粗精矿回收率的最显著因素。确定硫粗选作业的最佳药剂用量为:DHN250g/t,丁基黄药80g/t,2~#油40g/t,浮选时间9min。在此基础上,采用一粗一精二扫的闭路流程,可获得品位为48.64%、回收率为83.45%的硫精矿。研究结果对现场药剂制度的优化及生产有一定的指导意义。     

新型组合捕收剂条件探索及选矿试验研究

以辽宁某低品位铁磷矿(P2O5品位2.36%)为研究对象,通过研究新型捕收剂各组分药剂配比,探索对该低品位磷矿捕收性能更好的组合捕收剂。在磨矿细度-0.074mm占45%的条件下,使用捕收剂MG-2∶MES∶氧化石蜡皂=20.89∶1∶1.46的配比条件,采用一粗两精一扫的闭路流程,得到精矿品位32.56%,回收率74.33%的浮选指标。     

云南某中低品位胶磷矿浮选试验研究

对云南某中低品位胶磷矿进行了浮选试验研究,探索了磨矿细度、硫酸用量、磷酸用量、捕收剂(YP6-2B)用量对浮选指标的影响,结果表明:采用1粗1精开路单反浮选工艺流程,在磨矿细度为-0.074 mm质量分数占90.56%、H 2 SO 4用量为15.0 kg/t、H 3 PO 4用量为3.5 kg/t、YP6-2B用量为1.5 kg/t的条件下,P 2 O品位为22.46%、MgO品位为5.32%的原矿经浮选后可获得P 2 O 5品位为28.26%、MgO品位为0.91%、P 2 O 5回收率为82.22%的精矿指标。     

阳离子捕收剂醚胺对硫铁矿的试验研究

通过浮选试验,比较了阳离子捕收剂醚胺FX-13,硫醚胺FX-15与丁基黄药和十二胺对硫铁矿捕收性能的影响。试验结果表明硫醚胺FX-15能在低碱度(p H=8~10)以较少用量(2.4 g/t)显著提高硫铁矿的回收率。用FX-15作捕收剂反浮选硫铁矿可获得硫品位为50.79%,回收率为95.54%的优质硫精矿,是实现常温浮选硫铁矿的理想的捕收剂。     

钟祥磷矿选矿中不同捕收剂的浮选性能研究

根据钟祥磷矿的性质,采用正-反浮选工艺处理该胶磷矿。通过试验探索了不同性质的捕收剂对浮选的影响,最终选用合适的捕收剂按一定的配比进行试验,从原矿P2O5品位为19.20%,获得了磷精矿品位为30.51%,回收率80.13%的选矿指标,实现了目的矿物与脉石矿物的有效分离。     

湖北某磷矿反浮选钾长石试验研究

针对湖北某低品位难选硅钙(镁)质磷矿,主要脉石矿物为钾长石,原矿P2O5品位19.84％,SiO2品位27.78％.在磨矿细度-0.074 mm占比80.16％,预先脱除白云石及细泥的情况下,用醚胺类捕收剂T-609反浮选钾长石,可获得精矿P2O5品位33.65％,回收率达72.83％的良好指标,实现了磷灰石和钾长石的有效分离.捕收剂T-609与钾长石主要以物理吸附为主,T-609和消泡剂TOP的搭配使用,可有效改善阳离子捕收剂反浮选钾长石泡沫性能.     

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.     

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.     

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.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。     

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.     

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.