生产改质沥青提高炭素制品质量

简要介绍了改质沥青在炭素制品生产中重要作用以及生产改质沥青的两种工艺。     

添加剂技术生产优质改质沥青

本介绍了在改质沥青产品中回配添加剂的研究及生产情况，实践表明，使用添加剂技术是提高改质沥青质量有效手段。     

提高改质沥青产品收率的研究

为稳定改质沥青产品质量，对改质沥青生产装置中沥青联通管及闪蒸油采出管进行了改造，并相应调整了部分操作控制参数，改造后改质沥青产品收率大幅度提高。     

生产煤系针状焦副产品沥青的应用研究

为了使生产煤系针状焦的副产品沥青得到有效应用,对副产品沥青部分替代中温沥青生产改质沥青进行了反应釜试验研究,以确定改质沥青生产的混配比例和最佳工艺参数,并对应用前景进行了分析。结果表明,应用副产品沥青部分替代中温沥青生产改质沥青是可行的,且得到的改质沥青能够达到行业标准一级品的要求,降低了生产成本,减少了中温沥青用量,提高了软沥青产量。     

提高改质沥青质量的途径

通过生产实践，找到了影响改质沥青产品质量的主要因素和改善改质沥青质量的生产调节方法。     

中温改质沥青生产的研究与试验

通过控制中温沥青软化点，与改质沥青反应釜温度，把闪蒸油回配入改质沥青槽中，生产出合格的中温改质沥青产品。     

改质沥青质量问题及对策

对改质沥青出现的质量问题进行分析,找出影响改质沥青质量的原因并进行实验室模拟实验,在此基础上进行两次试生产并取得成功。该技术可提高现有改质沥青生产设备对中温沥青原料的适应范围。     

低温煤焦油沥青及焦油渣配煤炼焦实验研究

用自制1．5kg小焦炉为主要实验工具，以低温煤焦油沥青和焦油渣为改质添加剂，按不同配比与炼焦配合煤进行炼焦。实验结果表明：添加物与煤共焦化时，焦油和粗苯的产率都有不同程度提高，焦炭产率略有下降。除焦油渣外，各种沥青都使焦炭强度有所改善，尤其是低温煤焦油沥青可使焦炭各向异性成分含量有明显增加，从而使焦炭Ⅰ转鼓强度有较大幅度地提高。     

煤沥青的生产现状及发展趋势

本文对碳素用煤沥青的生产状及发展趋势进行了探讨，提出了改质沥青，浸渍沥青的开发与应用。     

改质沥青生产工艺的技术改进

介绍了在改质沥青生产过程中遇到的问题 ,针对此问题 ,通过技术改造 ,使生产工艺顺行 ,改质沥青质量合格。     

改质沥青对电煅无烟煤和沥青焦浸润性的研究

以改质沥青为粘结剂、电煅无烟煤和沥青焦为骨料,研究骨料粒度、加热温度、保温时间及振动次数对改质沥青浸润性的影响,并对不同粒度分布的电煅无烟煤和沥青焦的比表面积进行测定。结果表明,随着骨料粒度的减小,骨料颗粒的比表面积逐渐增大;改质沥青对电煅无烟煤和沥青焦的浸润性均随骨料粒度的减小和振动次数的增加而大幅度降低,随加热温度和保温时间的增加而逐渐增大。通过适当调整骨料粒度分布、加热温度、保温时间、振动次数等工艺参数,能够改善改质沥青对电煅无烟煤和沥青焦的浸润效果。     

改质沥青对冶金炼焦过程配合煤成焦性质的影响

 研究了配入改质沥青的量对4种配合煤的几种主要成焦性能灰分Ad、挥发分Vdaf、硫分St,d、收缩指数X和煤粘结指数G的影响。研究表明,加入改质沥青小于6％时,4种配煤的灰分逐渐下降,之后又逐渐上升;4种配煤挥发分的含量随改质沥青配入量的增加逐渐增大,到5％时达到最大;硫分含量因配合煤不同而有差异,配比4随改质沥青的增加硫含量变化不大,其它3种配合煤在改质沥青的含量小于5％时,硫含量基本不变,之后急剧增大;4种配合煤的胶质层厚度Y随着改质沥青的加入量的增大而增大;收缩指数X随改质沥青含量的增加而下降;配比3的粘结指数随改质沥青的含量的增加基本不变化,其它3种配合煤的粘结指数在改质沥青为5％～6%时达到最大。     

改质沥青对冶金炼焦过程单种煤成焦性质的影响

 针对宣化钢铁公司焦化厂所用的种煤,分别研究改质沥青的加入量,对灰分Ad、挥发分Vdaf、硫分St,d、收缩指数X和煤粘结指数G等主要成焦性能的影响。研究表明：加入改质沥青小于5％时,对瘦煤、1/3焦煤、焦2煤和弱粘煤的灰分、硫含量的影响不大,对弱粘煤、1/3焦煤和瘦煤的粘结指数没有明显的影响,对弱粘煤和瘦煤的胶质层厚度影响也不明显;随着改质沥青的加入,焦2煤和1/3焦煤的胶质层厚度显著增加,焦2煤的粘结性指数也显著增加。加入改质沥青大于5％时,随着改质沥青的加入,瘦煤和弱粘煤的灰分下降明显,焦2煤硫含量降低增大,瘦煤的胶质层厚度显著增加,弱粘煤、1/3焦煤和瘦煤的粘结指数有明显增加。加入改质沥青对各单种煤收缩指数影响规律较复杂,弱粘煤和1/3焦煤的收缩指数在配入3%改质沥青降到最小,以后又都明显增大,但改质沥青达到5%~6%后又减小;焦2煤和瘦煤在加入量小于5％时,收缩指数变化不大,加入量大于5％时才明显减少。     

浅谈SBS改性沥青防水卷材在莱钢民用住宅中的应用

SBS改性沥青防水卷材，不受季节的影响，冬期也可施工。莱钢近几十万平方米屋面防水工程中应用SBS改性沥青油毡做防水材料，未发生屋面渗漏现象，取得了较好的经济效益和社会效益。     

Cohesion and Toughness Improvement of Pitch Binder by Thermosetting Resin Modification for TiB2/C Composite Cathode

Furan, epoxy, and their composites were used to modify pitch binder for TiB₂/C composite cathode in aluminum electrolysis. The physical-chemical properties of the cathodes have been investigated. When the pitch is modified by furan and epoxy composite, the cathode exhibits the lowest electrolysis expansion (0.60 pct), open porosity (28.80 pct), and electrical resistivity (35.91 μΩ·m); the highest bulk density (2.54 g·cm^–3); and compressive strength (44.90 MPa). Results of the semicokes from a scanning electron microscope show that cohesion and toughness are effectively improved, especially in the case of the furan and epoxy composite-modified pitch semicokes. Studies using Fourier transform infrared spectroscopy indicate that an aromaticity index of 0.845 and a condensed degree Abs₈₈₀/Abs₁₆₀₀ of 0.927 of polynuclear aromatic hydrocarbons are obtained, suggesting that a more complete reaction of the cross-linked curing takes place in the pitch binder modified by furan and epoxy composite, which improves cohesion and toughness of the binder and, thus, enhances the performances of TiB₂/C composite cathode.     

A dual mechanism for sound pitch perception: new evidence from brain electrophysiology

The N1 component of the auditory brain evoked potential was used as a direct electrophysiological index, to study how the perception of pitch for complex periodic tones can be influenced by the phase of the harmonics that make up a sound, according to their ranks. Results showed that in the low pitch and/or high spectra region, N1 latency was modified by phase, whereas it was not in the high pitch and low spectra region. These data help bring evidence towards a dual mechanism for pitch perception, and demonstrate that these processes take place within 110 ms following stimulus onset. Results are compatible with a model based on the resolvability of components and on the bandwidth of auditory filters.     

粘结剂用煤沥青质量状况分析

煤沥青中QI分为原生和次生,影响原生QI的主要因素有：炼焦配煤的组成、煤料的粒度容重、炼焦温度和煤的水分等;影响次生的是：煤焦油加工设备材质和煤焦油蒸馏工艺及煤沥青改质方法。煤沥青主要作为成型碳素材料粘结剂,目前质量还存在未去除携带QI、焦油蒸馏时加碳酸钠使沥青中钠离子偏高、对中间相（次生QI）含量和大小没有控制手段和检验方法等。针对这些问题,我国煤沥青生产厂在技术开发、引进、产品开发、完善检验手段等方面开展了大量工作。     

铝板锯切机清屑装置的改进设计

将铝板锯切机原清屑装置的刮板清屑结构改进为小车清屑结构,解决了传动链条因受力不均被拉断问题;将单节距链条改为双节距链条,解决了传动链条内链板夹屑问题,并减轻了链条重量,降低了链条成本,提高了设备的工作可靠性。     

Absolute pitch.

Absolute pitch (AP) is the ability to identify a tone's pitch or to produce a tone at a particular pitch without the use of an external reference pitch. AP exists in varying degrees among people generally described as AP possessors. AP possessors vary not only in the accuracy with which they can identify pitches, but also in their ability to produce pitches absolutely and in their ability to identify tones of various timbres and in various pitch registers. AP possessors' memory for pitches is mediated by verbal pitch names; they do not have superior memory for pitches per se. Although the etiology of AP is not yet completely understood, evidence points toward the early-learning theory. This theory states that AP can be learned by anyone during a limited period early in development, up to the age 6, after which a general developmental shift from perceiving individual features to perceiving relations among features makes AP difficult or impossible to acquire. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Measuring larynx movement in standard Thia using the cricothyrometer

Vertical movement of the larynx during connected speech was investigated in Standard Thai - a language that has five phonologically contrastive tones. The effects of pitch, consonant phonation-type, vowel quality, tonal categories, and position in the utterance were determined. Utterance position was found to be the factor most clearly associated with variations in larynx movement. The occurrence of an overall rise-fall pattern of larynx movement distributed over utterances of varying pitch patterns leads to the conclusion that larynx height is not a principal factor regulating pitch in connected speech. Implications for models of pitch production, distinctive features for tone, theories on the historical development of tone and the role of larynx movements in the production of consonants and vowels are discussed.