降低联合粉磨系统水泥标准稠度用水量的途径

针对联合粉磨系统出磨P O42.5水泥标准稠度用水量较大的问题进行探讨,结果是:(1)熟料的易磨性变化会引起水泥颗粒级配变化,从而影响水泥标准稠度用水量;(2)上调入磨混合材水分,增加易磨性较好的混合材(石灰石或粉煤灰)掺加量以产生较多的1μm～10μm微粉,减少空隙填充水,可降低水泥浆体的用水量;(3)降低出磨水泥比表面积,拓宽45μm、80μm筛余含量,可优化水泥颗粒分布减少颗粒间隙填充水和表面吸附水;(4)严格控制进厂二水石膏结晶水及SO3含量,避免或减少混入半水石膏、硬石膏,当熟料用水量持续增大或外界气温上升时适当上调出磨水泥SO3控制指标;(5)选用助磨兼减水性能的助磨剂,既可改善物料粘聚又能适当降低水泥用水量。     

磨内喷水系统的使用经验

我公司年产100万t的水泥粉磨站是由辊压机和开路水泥磨组成的联合粉磨系统,水泥磨为Φ4.2m×13m边缘传动开路磨,在夏季,出磨水泥温度较高,公司于2010年5月在磨头和磨尾各配置了一套磨内喷水系统。     

测量皮带秤粉料厚度的快速标定方法应用

<正>我公司水泥粉磨生产线是由HFCG120/45辊压机+SF500/100打散分级机+Φ3.2m×13m水泥磨组成的联合粉磨系统,粉煤灰在混合材中掺量最大,其计量秤的波动对水泥质量影响较大,而且粉煤灰有流动性强的特性,流量不易控制,生产中粉煤灰秤的标定     

减少开路水泥粉磨系统磨尾熟料颗粒的措施

我厂2台Φ2.4m×13m开路高细磨因开路系统存在严重过粉磨及磨尾水泥成品中含有熟料颗粒等问题，使粉磨系统很难达到优化状态。水泥颗粒在经包装回转筛时能够筛除，不会给施工带来影响，但采用散装水泥时，特别是精确计量水泥量的施工中，常常因水泥中的颗粒，而使设备不能正常运转，影响施工。为此，对我厂开路水泥粉磨系统磨尾颗粒进行了检测并采取了一些改进措施。1磨尾颗粒的检测研究1.1磨尾颗粒的检测方法及结果　　检测时，分别对1号、2号水泥磨磨尾多次瞬时取样，做筛余分析，研究掌握我厂磨尾颗粒的现状。　　每2h为1个检测周期，每…     

粉煤灰计量管理与除尘改进

某水泥厂2台φ3.0m×11 m闭路水泥磨实施磨尾掺加粉煤灰的技术改造,重点介绍了粉煤灰库位置的确定和粉煤灰库除尘方案、粉煤灰计量方案的对比和确定;同时对改造后运行中存在的问题(粉煤灰溢出计量和输送设备,粉煤灰库顶扬尘和其中一台水泥磨提升机扬尘严重甚至断链)及其处理措施,也进行了分析和介绍.目前该系统运行良好,粉煤灰的流量稳定、计量准确,且运行电耗较低.     

机械活化对粉煤灰作为水泥混合材使用性能的影响

活性较低是限制粉煤灰在水泥建材行业大规模应用的重要因素之一,通过试验研究了机械粉磨对粉煤灰粒度分布与粉煤灰使用性能的影响。研究表明：采用机械粉磨的方式显著增大了粉煤灰中中小颗粒区间（0～32μm）的量,粉煤灰的活性得到激发,具体表现在增大粉煤灰的细度显著缩短了水泥的凝结时间,且高细度的粉煤灰能有效的提高水泥的力学性能。     

磨机体外掺粉煤灰生产水泥

2004.11CHINACEMENT在现有的生产工艺中,使用粉煤灰作混合材生产水泥时,是将粉煤灰同水泥熟料、石膏等原料经配比共同入磨粉磨,出磨物料入选粉机进行分离,符合细度要求的水泥粉被及时分选出来成为水泥成品,较粗颗粒物料又回磨机内循环粉磨至成品。2001年我公司在1号水泥磨(2台准2.2m×6.5m)实施了磨机体外掺粉煤灰生产水泥工艺,实施效果十分理想,公司14台准2.2m×6.5m或准2.2m×7.0m水泥磨相继推广使用,这16台水泥磨机体外掺粉煤灰生产工艺是一样的。2003年公司2×2500t/d新型干法生产线设计时也推广该工艺,工艺作了改动。这两种工艺和…     

粉煤灰在串联磨中的应用

利用粉煤灰可以作助磨剂和混合材的2种特性,在生产复合硅酸盐水泥时将粉煤灰按一定比例分别在一级磨和二级磨中粉磨,使水泥磨产量、出磨水泥质量、粉煤灰掺量都有一定程度的提高。     

不同混合材及掺量对水泥性能的影响

水泥中掺加混合材的作用主要是提高水泥产量,降低水泥生产成本,调节水泥强度等级,改善水泥性能与质量,综合利用工业废弃物,减少环境污染,实现水泥工业的生态化[1]。矿渣（矿粉）、粉煤灰及石灰石是目前应用最为广泛的混合材。矿渣掺加方式常见有两种,一种是矿渣磨前加入,另一种是矿粉外掺。矿渣与水泥熟料共同粉磨时,由于矿渣易磨性明显差于熟料及其他混合材,混磨的结果是出现选择性粉磨,矿渣不能被有效粉磨,无法充分发挥矿渣的活性。因此有必要了解矿渣与熟料共同粉磨对水泥性能的影响的量化关系。粉煤灰作为混合材,其活性成分之所以能参与火山灰反应,在于粉煤灰颗粒中的玻璃相在碱性条件下可以破裂而溶出活性成分,然后得以与Ca（OH）2反应生成C-S-H这种对强度有贡献的产物[2]。     

一种水泥助磨剂配方的研究及其性能测试

在水泥粉磨过程中加入水泥助磨剂,是提高生产效率和节约能耗的重要途径之一。为了降低助磨剂生产成本,选用化工废料聚合醇胺为原料,制备出一种液体水泥助磨剂,然后研究其对粉煤灰水泥物理化学性能的影响。实验结果表明:小于30μm的颗粒增加4.2%,0.08 mm筛筛余降低1.7%;凝结时间和安定性均合格,对实验水泥不仅起到了良好的助磨效果,也能提高水泥的中后期强度。     

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。