Eirich混捏机的性能特点及其应用

随着当前电解铝行业的蓬勃发展,德国Eirich连续混捏机在铝用炭阳极生产领域的应用愈来愈广泛。本文介绍Eirich混捏机的性能特点,并和传统连续混捏机进行比较,Eirich混捏机应用前景广泛。     

强力冷却机在炭阳极间断混捏生产中的探索与运用

随着大型电解槽的不断开发和运用,对预焙阳极的质量提出了更高的要求,而成型工序是影响阳极质量的一个重要环节。本文主要针对铝用阳极在电解过程中的使用情况,浅谈糊料强力冷却技术和设备在间断混捏生产阳极中的探索与应用,对间断混捏(混捏锅)的传统糊料冷却方式进行了技术改进,改进后糊料的冷却温度可以提高30℃以上,为糊料混捏温度提升至180~190℃创造了条件。成功解决了阳极成型工序中必须高温混捏,低温成型的矛盾,而且使沥青浸润焦炭颗粒的效果更好,混捏质量得到进一步提高,使阳极生块的致密性与均质性均得到稳定的提高,从而整体提高了预焙阳极的质量。     

卧式双轴S型混捏机的设计与计算

在化学工业、硅酸盐工业、橡胶工业以及其他工业中用于混捏固体、散粒状(粉状)及粘糊状物料的设备烦多,分类方法也很多,本文拟就卧式双轴S 型混捏机的工作、设计计算的一般原理加以探讨。一、卧式双轴S 型混捏机的轱构与工作原理卧式双轴S 型混捏机的结构为内部平行装一对S型的铸铜搅刀,搅刀在机壳内作反方向旋转,机壳的底是由两个半圆筒形的槽构成,这样便在槽的中央构成了一个纵向脊形座。混捏机的一些主要部件如图1所     

新型碳糊混捏设备——爱立许强力混合机简介

在生产炼钢用电极和炼铝用阳极中,各国制备碳糊使用的混捏设备,目前常用的有双Z型搅刀混捏锅和连续混捏机。生产双Z型搅刀混捏锅的工厂或公司有:英国JENKINS公司、美国JOY公司、英国BAKER RERKIHS公司、西德KHD公司等。生产连续混捏机的工厂或公司有:瑞士BUSS公司、瑞士LIST、公司美国BAKER PERKINS公司等。近些年来西德爱立许(EIRICH)公司研制的新型混捏设     

炭素制品的混捏工艺改进研究

在炭素制品生产中,混捏是制备优质糊料的关键工艺,对制品的理化指标具有重要的影响。本文以铝用炭阳极制备为例,对传统混捏工艺进行了改进。结果表明,与传统混捏工艺相比,在配方固定的前提下,将适量的粉料预先添加到熔化沥青中,然后再与干料混捏,能有效改善炭阳极的常规物理性能。     

炭素混捏凉料机设计研制思考及解决方案

为改善炭素企业的生产环境,提高混捏产品质量,着手对混捏凉料机设计研制,扼要介绍了混捏凉料机设计研制中搅刀轴系统的总体设计、搅刀体的设计及制作,在设计过程中对混捏凉料机螺旋叶片更换以及对混捏凉料机中物料粘机体进行了考虑及其分析.     

关于电极生产凉料工艺的探讨

针对我国电极生产混控成型中凉料工艺的生产现状．综合现代热媒换热技术．提出用热媒换热凉料的新工艺──在混捏机中完成混捏和凉料，并进行了综合传热分析。     

热媒锅炉载热体融化沥青的应用

热媒锅炉载热体融化沥青的应用冯建中，刘建军（包头铝厂）１前言我国自焙电解槽用阳极糊在铝用炭素生产中仍占重要位置。阳极糊是不同粒度的石油焦煅浇后和粘结剂（煤沥青），按照一定的工艺配方经过高温混捏后冷却而成。做为粘结剂的煤沥青在阳极糊生产过程中，国内除少...     

双搅拌双加热混捏机研究应用

山东晨阳碳素股份有限公司引入国内首创的NH2000升双搅拌、双加热、预热混捏机（又称为双层混捏机），替代老式混捏机，每锅可混捏糊料2.0t，混捏时间由原来的每锅60min，缩短到40min。此混捏机在没有增加动力负荷的情况下，利用链条传动，下层锅加入粘结剂湿混，上层为干混，在由同一电动机运行时带动两混捏室绞刀同时运转，达到同时湿捏和干混的目的。     

宝钢型煤系统的分析与思考

在宝钢三期型煤工艺的设计中,根据一期型煤工艺的设计原理及生产实践,取消成品冷却系统,采用了卧式混捏机,将混合与混捏合二为一,使三期的型煤工艺流程大为简化,取得了可观的经济效益。文中对影响型煤发展、降低优质炼焦煤的配入等问题进行了分析与思考。     

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.     

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.     

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。