低品位氧化锌矿堆浸实验研究

对含锌11.49%的低品位氧化锌矿以自然粒度筑堆,堆高1 m,浓酸熟化、板结后,采用间歇式喷淋(1/3闲置),喷淋强度10~12 L/(m2×h),堆浸温度20~32℃,堆浸浸出液终点pH值控制在1.0~1.5,经过13周的堆浸后,2 t规模低品位氧化锌矿的锌堆浸浸出率大于93%. 堆浸渣石灰乳处理以消除其可能的环境污染. 低品位氧化锌矿堆浸浸出工艺在技术上是可行的.     

硫酸法钛白粉质量差的原因及解决办法

在硫酸法钛白粉生产过程中,钛白粉产品质量的控制关键在于物料净化、颗粒粒径及粒径分布和表面处理这三大环节。从这三大环节出发,分析了某厂钛白粉产品质量差的原因,主要是钛矿品位低、钛液净化工艺及设备落后、水解技术落后、晶型转化过程中转化剂分散不均匀、偏钛酸洗涤工艺不合理和各煅烧窑煅烧强度不一致等。针对这些原因,分别从工艺和设备上提出了一系列有利于提高硫酸法钛白粉产品质量的技术方案,并对生产装置加以改造。改选方案实施后,钛白粉产品质量大有提高,即钛白粉杂质含量降低,粒径变细且分布变窄,分散性能有了明显好转,遮盖力等指标有了明显提高。     

Cu(II)-Glu2——CO32——H2O体系热力学平衡分析

以L-谷氨酸一钠作为浸出剂浸出低品位氧化铜矿的常见铜形态?碱式碳酸铜,根据配位化学理论,研究了Cu(II)-Glu2--CO32--H2O体系中Cu(II)的配合平衡热力学,并绘制了L-谷氨酸一钠浓度0~3 mol/L和pH 5~14内的热力学平衡图,研究了L-谷氨酸一钠浓度、pH和游离CO32-浓度对L-谷氨酸一钠浸出碱式碳酸铜的影响,并对热力学计算结果进行了实验验证. 结果表明,铜离子浓度理论计算值与实验值相对误差的绝对平均值为5.32%,所选数据的准确性较好,同时也说明用谷氨酸一钠浸出低品位氧化铜矿是可行的.     

攀西地区含钛高炉渣中钛的分选研究

以攀西地区含钛高炉渣为原料,通过高温处理使高炉渣中钛组分富集于钙钛矿中,并确定了最佳磨矿时间。以硫酸和氢氧化钠为pH调整剂、水玻璃为抑制剂、辛基羟肟酸为捕收剂、乙二胺四乙酸为络合剂进行单因素浮选试验,得到了优化的工艺条件:矿浆pH为5~6,乙二胺四乙酸用量为2000 g/t,辛基羟肟酸用量为112.5 g/t,水玻璃用量为600 g/t。采用1粗3精2扫的开路浮选流程进行试验,获得了TiO 2品位为42.38%、TiO 2回收率为23.99%的钛精矿指标,精矿TiO 2品位较高炉渣原渣TiO 2品位提高了1倍。     

全棉筒子纱氧漂工艺的生产实践

为提高漂白全棉筒子纱的白度、强力、毛效等指标,在生产中探讨了水质、过氧化氢用量、漂液pH值、氧漂温度、氧漂时间对筒子纱性能的影响,得出了全棉筒子纱的最佳氧漂工艺。其中27%双氧水浓度12～13 g/L,pH值10.5～11.5之间,氧漂温度与时间控制98±2℃,55分钟。在此工艺下,全棉筒子纱的白度、强力、毛效获得最佳协同效果,可满足客户要求。     

青菜冲矿在学吉化中狠抓科技与安全

开阳磷矿矿务局青菜冲矿在开展质量、品种、效益年活动中认真贯彻本矿的“学习吉化优化管理、科技兴矿、争创一流”的总方针和“安全、保产、优质、高效、实现“052116”的总目标(即0:各类重大事故为零;5:供矿50万吨、掘进5000米;2:供矿品位比计划提高两个百分点、发展粉矿及出口矿两个品种;     

以过氧化氢氧化二甲基二硫制备甲烷磺酸工艺条件的探讨

以过氧化氢氧化二甲基二硫制取甲烷磺酸工艺 ,考察了主要反应条件、温度、配比对反应的影响 ,确定了较佳工艺条件 :反应温度 85℃ ,反应配比m(CH3—S—S—CH3)∶m(H2 O2 )为 1∶1.81。在此条件下 ,产物收率 95 .1%。产品质量符合出口指标要求     

水泥矿山智能质量控制系统的研究

文章介绍基于钻机自动取样分析和石灰石在线中子分析的水泥矿山全流程的智能质量控制系统,该系统通过钻机自动取样分析系统获得高密度、高精度的矿山钻孔数据库,生成更加准确的矿山配矿品位模型,可有效提高配矿作业的品位稳定性,再通过石灰石中子在线分析仪的品位校验,进一步修正进厂石灰石的综合品位与要求值的偏差,有效提高进厂石灰石的品位稳定性。水泥矿山智能质量控制系统使矿山的配矿作业由反馈控制转变为指导控制,形成以配矿品位模型的精细化配矿为主,中子在线分析仪的结果校验为辅的矿山全流程质量闭环控制新模式。     

浮选柱在胶磷矿反浮选中的应用

采用浮选柱对云南某胶磷矿进行了现场分流半工业试验研究,在一段反浮选的工艺流程结构下,获得了精矿品位为P2O531.09%,精矿回收率93.27%的良好指标。与同期浮选机生产相比,在给矿品位和精矿品位基本相同的情况下,P2O5回收率提高了7.43%。该技术的研究为我国中低品位胶磷矿的分选提供了新的途径。     

中低品位磷矿在小磷酸装置的生产实践

介绍中低品位磷矿用于小磷酸装置生产采取的配矿、选矿措施及其指标控制情况,并通过技改逐一解决磷酸生产中出现的问题,取得磷收率由91.9%提高至94.5%的明显效果。     

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.     

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.     

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。     

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.     

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。