砂沟选煤厂的优化设计

分析了砂沟选煤厂原煤性质,说明煤1属中灰煤、较难选煤,原煤易碎,粒度细,煤泥、矸石含量大;煤2、煤3分属高灰煤、极难选煤和低灰煤、易选煤,煤中含夹矸,煤泥量大。通过分析砂沟选煤厂产品结构和设备选型,将选煤工艺分为原煤准备系统、脱泥分选系统、产品脱介脱水系统、TBS粗煤泥分选系统、介质回收机添加系统、浮选及煤泥水系统;确定选煤方法为：100—50mm动筛排矸,50．0—1．0mm脱泥有压给料三产品重介质旋流器分选,1．00—0．25mm粗煤泥TBS分选,-0．25mm细煤泥浮选机浮选。最后对主厂房,准备、浓缩及产品仓,输送带通廊进行了厂房布置,说明砂沟选煤厂优化设计具有产品结构合理、选煤方法先进、工艺设计适应煤质特性、设备先进可靠、自动化程度高、厂房布置空间宽敞、便于操作检修等特点。     

糯东矿无烟煤分选工艺的选择

为提高无烟煤分选效果,分析了糯东矿煤质特性、粒度组成和可选性,确定原煤属低中灰~中灰、中高硫~高硫、低磷、特低抗破碎强度无烟煤,煤中硫以无机硫化铁硫形式为主;煤中细粒级含量较高,需加强细粒煤分选,粗煤泥可单独分选,产品易脱水;原煤可选性为中等可选。结合原煤性质,确定糯东选煤厂产品定位为:17煤分选中、小块煤用于化工用煤,末精煤用于高炉喷吹用煤;20煤分选中、小块煤用于化工用煤,混煤用于动力用煤。通过对比分析常用选煤方法及工艺的特点,确定糯东选煤厂无烟煤分选方案为:选前+100(80)mm检查性手选、-100(80)mm混合跳汰入选、粗煤泥干扰床分选机(TBS)分选、细煤泥浮选、尾煤浓缩压滤的联合工艺流程。     

赵家山选煤厂粗煤泥系统改造实践

针对赵家山选煤厂粗煤泥分选系统TBS精矿高灰细泥影响精煤灰分、TBS尾矿产率高且灰分低、粗煤泥设备处理能力不足进行改造。将原设计TBS分选改为TBS+螺旋二级分选；精矿由振动弧形筛改为叠层高频振动细筛脱泥降灰；改变筛下煤泥水流向。改造后中煤产率降低11.30%,精煤产率增加5.60%,矸石(煤泥)产率增加5.70%。     

螺旋分选机精选煤泥新工艺

<正> 我国选煤厂大于0.5mm的煤一般采用跳汰和重介选,而小于0.5mm的煤则采用浮选。近几年煤泥分选技术虽有新的发展,但尚不能满足选煤生产的需要,并存在如下问题:1.许多选煤厂跳汰机的分选下限高,而用振动筛回收粗煤泥时,因其灰分高,在掺入出厂精煤后,影响销售精煤的灰分或全厂精煤的产率。2.有的选煤厂因入选原煤量增加,而浮选车间的处理能力不足,造成出厂煤泥量增加,并影响全厂精煤的产率。3.有的小型炼焦煤选煤厂不设浮选车间,煤泥不经分选而直接排至厂外沉淀池,不但使煤炭资源得不到合理利用,而且加剧矿区环境污染。螺旋分选机是分选煤泥的新重选设备,国外一些国家已在选煤生产中广泛应用,国内近几年只在选矿生产中推广使用。为了提高我国煤泥处理的技术水平,改     

赵固一矿选煤厂选煤工艺的确定

通过对赵固一矿选煤厂原煤粒度组成、浮沉试验、可浮性评定和发热量的分析可知:原煤较脆,矸石易泥化,煤泥中存在高灰细泥,原煤块、末煤可选性均为易选。在分析原煤性质及产品定位的基础上,提出了选煤工艺设计原则,确定了末煤分选下限为1.5 mm,并可调节至0.25 mm和0;确定赵固一矿选煤厂选煤工艺流程为:80～13(10)mm块煤采用重介浅槽分选机主再选,13(10)～1.5 mm末煤采用脱泥有压三产品重介旋流器分选,1.50～0.25 mm采用TBS分选,-0.25 mm采用浮选柱分选。最后阐述了选煤厂选煤工艺设计步骤,即应以煤质分析为基础,以产品结构为目标,以设备特点为依托,同时特殊环节特殊关照,确定出最适合选煤厂煤质特征的选煤工艺流程,实现选煤设计的简洁、高效、灵活。     

三产品重介质选煤工艺在安泰选煤厂的应用

为设计高效、先进的炼焦煤选煤厂,通过对比分析目前国内常用炼焦煤工艺,结合安泰选煤厂的原煤性质及周边矿区现有分选工艺,研究确定安泰选煤厂工艺流程,并对选煤厂应用效果进行分析。结果表明,当分选精煤灰分为10%左右时,精煤产率均在50%以上,原煤可选性属于较难选~难选,为良好炼焦用煤。确定安泰选煤厂工艺流程为:预先脱泥无压三产品重介质旋流器主选,1.5~0.25 mm TBS粗煤泥分选,0.25 mm细煤泥浮选,经浓缩压滤后回收。分选密度稳定在1.40 g/cm3时,TBS精煤灰分为10.17%~11.71%,浮选精煤灰分为9.28%~10.67%,分选精煤灰分均在10%以下。中煤损失产率维持在1.85%~3.20%,中煤发热量为23 MJ/kg以上,达到动力煤要求。     

潘一东、济三选煤厂改造工艺的设计与研究

针对潘一东、济三两座选煤厂原工艺系统存在的问题,对两厂的煤质资料进行了分析,确定了原煤选前是否脱泥,粗煤泥是否分选,高灰细泥如何脱泥浮选等工艺,提高了1/3焦精煤产率,提高了选煤厂经济效益。     

赵各庄矿选煤厂技术改造实践

赵各庄矿选煤厂原煤、煤泥筛分试验表明:原煤由难选煤转化为极难选煤,原煤煤泥中细粒级含量较大,细粒级煤泥灰分较高。针对选煤厂存在的处理能力低、精煤产率低、介耗超标和工艺系统复杂等问题,采用了无压给料三产品重介质旋流器不脱泥不分级选煤工艺替换原跳汰—重介—浮选联合分选工艺。从受煤系统及原煤准备,分选、脱介及脱水作业,煤泥重介分选,介质回收,粗煤泥回收和煤泥水处理6个方面详细介绍了选煤厂技术改造措施。最后对选煤厂技术改造效果进行了分析,结果表明:技术改造后,赵各庄矿选煤厂简化了煤泥水系统,解决了选煤厂洗水浓度高的问题;选煤系统最大处理能力由300 t/h提高到450 t/h,节省吨煤加工费928.8万元/a,利润可达4500多万元/a。     

红柳选煤厂估算入洗原煤灰分指导配煤生产的实践

根据：原煤灰分=(精煤灰分×精煤产率+矸石灰分×矸石产率)÷100的算法原理，在上位机使用Python软件实时获取红柳选煤厂皮带秤的在线数据，计算出精煤产率、矸石产率，结合日常精煤、矸石的平均灰分(红柳选煤厂的精煤、矸石灰分比较稳定),估算出原煤灰分。然后根据精煤灰分和估算的原煤灰分，配煤生产灰分为14.50%～17.00%的产品(洗混煤),既提高了配煤产品灰分的合格率，又减少了生产过程人工采样检测灰分的劳动量。     

柳湾煤矿选煤厂粗煤泥分级回收工艺优化研究

柳湾煤矿选煤厂为解决粗煤泥分级分选中存在的粗精煤泥产品灰分不稳定及高灰细泥污染精煤产品两个问题,通过工艺优化,选用叠层高频振动细筛替换原用弧形筛后,工艺效果评价结果表明,脱泥效率、粗精煤泥产率均有提高,同时也提高了TBS分选密度和TBS尾矿灰分,为企业创造了很好的经济效益。     

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。     

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.     

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。     

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.