粉子Blaine值与阳极生产

采用Blaine值表示粉子相对比表面积，Blaine值能更准确地指导阳极生产。本文通过大量分析数据证明Blaine控制生产的科学性，并对影响Blaine的因素进行探讨，最后找出控制Blaine值的方法及最佳值，从而使阳极生产更加稳定。     

大型预焙阳极配方中粉料技术的研究

论述了大型铝电解槽用炭阳极配方中粉料的作用、影响、质量趋势,分析了代表其特性指标的纯度、细度、比表面积以及Blaine值的关系,提出了粉料的级配应用概念,同时从理论及实用角度解析了粉料的级配关系。     

布袋除尘回收粉料再利用

笔者针对在喷雾阶段布袋除尘器所回收粉料的化学成分和颜色波动造成回收粉料不可再利用的现状。根据化学成分和烧成后的颜色,对浆料进行分类。通过分类喷粉,减小了布袋除尘器回收粉料的波动性,通过对布袋除尘器回收的粉料化浆分散和成分调整,避免了对布袋除尘器回收粉料进行球磨造成浆料颗粒度进一步减小。通过分类回收和化浆制粉,提高了利用布袋除尘粉料制备的再生粉料的稳定性,实现对布袋除尘粉料的再利用。     

粉子在线检测技术在预焙阳极生产中的应用

炭素厂生阳极产品制造过程中,磨粉工序生产的粉末原料纯度/Blaine值对生阳极的质量影响较大。本文在磨粉工序引入粉子在线检测系统,监控粉末原料的制备。粉子在线检测系统的工作方式是利用气力连续取样,样品在样品室内被激光照射后返回工艺管路;根据光的波粒二象性和惠更斯-菲涅尔原理对被测样品进行检测,并转换成电信号;粉子在线系统组成包括工作端、控制系统、辅助系统。与以往的工艺设计中多采用离线间断的检测方式相比,检测的准确性、时效性和连续性大大提高。     

勃氏透气仪替代Blaine值测定仪在预焙阳极生产中应用可行性分析

通过对Blaine值测定仪和勃氏透气仪测量原理及其测量结果的分析,发现Blaine值与勃氏透气仪测量的比表面积值在数值上具有密切联系和对应关系,从而在预焙阳极生产中勃氏透气仪替代Blaine值测定仪具有一定的可行性.     

细粉在生阳极工艺配方中的作用

考虑到细粉配入量对预焙阳极性能的影响,Alumar铝业公司多年来通过试验来研究这种影响.本文中细粉的细度用Blaine指数进行衡量.通过调整Blaine指数改变粉料用量,结果表明:生阳极和预焙阳极体积密度的提高与空气渗透性的改善有着紧密的关联性,电阻率和抗弯强度的改善需要提高沥青配入量,在裂纹出现概率没有增加的前提下焙烧过程的烧失量较低.在煅后石油焦振实堆积密度呈现下降趋势的情况下,加强对细粉的控制也是一个潜在的提高预焙阳极质量的有效手段.     

新型玻璃防霉隔离粉回收的实践探讨

面向循环经济的可回收新型玻璃防霉隔离粉,其配方以隔离树脂为基本骨架,加入流动促进剂,对无机酸和有机酸进行改性处理。对原片玻璃不仅有优良的隔离作用,而且对玻璃表面有非常好的防腐蚀作用,进一步深入研究了与之配套的玻璃防霉隔离粉回收工艺。     

浅谈如何提高粉尾回收利用率

本文通过定义粉尾回收范围和回收利用率,对粉尾不能进行大比例回收的原因进行了总结分析,得知设备配置不完善、浆料工艺参数不达标、喷粉过程随意性大等是造成粉尾难以回收的主要原因。根据原因提出了相应的控制措施并严格执行跟踪,项目实施后,达到了回收利用率超过80%的目标,效益可观。     

铝阳极氧化废液中硫酸铝的回收

将铝阳极氧化生产中碱蚀和阳极氧化工序的废液按一定的比例排放至混合槽内,控制混合液的pH值为5．5左右,通过加入凝聚剂、沉淀过滤、稀硫酸调整pH值、加热浓缩结晶、重结晶等工序可得到高纯度的硫酸铝。该回收处理操作简便,既解决了环保问题,又提高了经济效益。     

粉料对预焙阳极质量的影响及控制途径

在预焙阳极生产中,使用到的主要材料是石油焦。如果石油焦粉焦和杂质的含量较高,一方面是对煅后焦的中碎、筛分和配料工序产生干扰影响,另一方面则由于粉料粒度不均匀,导致阳极难成型,或是在焙烧过程中阳极性能不稳定。     

废纸基电路板非金属材料性质及其复合材料性能

利用电镜扫描、X射线荧光光谱和红外光谱分析废纸基PCBs非金属粉以及对复合材料力学性能和热性能测试,研究了废纸基PCBs非金属粉性质及对复合材料性能的影响,结果表明:废纸基PCBs中含少量玻璃纤维,绝大多数是树脂聚合物,颗粒表面存在羟基、羰基、缩醛基、硅醇基等官能团,是极性材料;非金属粉经改性后与基体PP混合表现出很好的相容性,有效提高复合材料弯曲强度和维卡软化温度(VST),增加复合材料的阻燃性能;复合材料弯曲强度随非金属粉添加量增加而增大,0.08cm(180目)非金属粉添加量30%时可提高弯曲强度9.1MPa,VST约提高2℃;小颗粒非金属粉有利于复合材料性能改善,可作为填料制作PP复合材料。     

The properties of recycled PVC bottle compounds. 2: Reprocessing stability

Following a study of the mechanical properties of recycled PVC recovered from post-consumer bottles, this study focuses on the effects of recycled material on processing. In particular, the effects of multiple recycling were studied to investigate any problems that may arise due to the repeated incorporation of recycled material into the processing stream. Batches of recycled flake and powder as well as pure but processed bottle flake material were subjected to simulated multiple recycling using a Torque Rheometer. Ten minutes at 170°C followed by granulation represented one recycle. Molecular weight and Infrared analyses were performed to assess the degree of degradation occurring during reprocessing. The results indicated a rapid degradation of the two recycled grades when compared with the purer bottle flake PVC. Further multiple recycling was then performed on bottle flake mixed with 0.2% polyethylene, which showed that the PE impurities accelerate the degradation process. Finally, the effects of restabilizing by adding new bottle flake material at each step were investigated. It was shown that surprisingly small levels of new material (30%) prevented degradation, even after 15 recycle steps.     

Effect of Blaine fineness of recycling brick powder replacing cementitious materials in self compacting mortar

The present study aims to investigate the use of recycling brick powder (RBP) as a fractional replacement of cement in self compacting mortar. Cement was replaced by recycling brick powder in different proportions (0, 5, 10, 15 and 20%) by weight of cement. Three Blaine fineness (SSB) were used in this study (3900, 4300, and 5200 cm²/g). The experimental results showed that the substitution of cement by recycling brick powder with higher content (20%) decreases the workability of self compacting mortar (about 3%) and reduces its passing ability (about 30%). On the other hand, the increase of Blaine fineness of (RBP) led to improve the Fresh behaviour of mortars when the content of recycling brick powder kept constant. Mechanical performances of mortars in terms of compressive and tensile strength were improved by 13 and 105% respectively. Economically, the substitution of cement with 10% of brick powder gives a win of 10% of cement with an increase of 13% in compressive strength and 107% in tensile strength.     

Fire‐retardant plastic material from oyster‐shell powder and recycled polyethylene

A series of plastic materials from recycled polyethylene (PE) and oyster‐shell powder were prepared to test their fire‐retardant properties with an aim of finding a practical way of waste recycling. Oyster‐shell powder was found to be mainly composed of calcium carbonate and it decomposed to calcium oxide and carbon dioxide at temperature higher than ～800°C, thus preventing fire from access of oxygen by the produced carbon dioxide. This fire‐retardation mechanism is environmental‐friendly, since another available method, the inclusion of halogen‐containing compounds, normally generates toxic chemicals like dioxine during incineration. To improve mechanical properties of this composite material, surface of oyster‐shell powder was coated with cetyltrimethylammonium bromide (CTAB). Flame retardation and the mechanical properties of these composite resins were analyzed. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1583–1589, 2006     

Investigation of the recyclability of powder coatings

100% recyclability is one of the major advantages of powder coating. However, it can never be achieved in reality. Coating powders, especially finer powders with particle size below 30 μm, were found to have much worse flow performances after recycling from electrostatic spraying so as to decrease the recyclability. Therefore, this study was designed to investigate recycled coating powders to determine the underlying cause of decreased flow performance. The investigations were based upon three major factors that make the differences between original powder and its recycled powder: particle size, humidity exposure and flow additive concentration. By adjusting the three factors independently, the influences to powder flow properties were analyzed. Results showed that the decreased particle size of the recycled powder had the most significant effect on the flow properties. Additive concentration on the powder particles did not change with respect to the particle specific surface area after electrostatic spraying. Humidity had only a minor effect on the flow properties of powder coatings.     

鞍山千山公路再生沥青老化研究

以辽河AH-90高升工地沥青为再生沥青的补充沥青,选用自制废旧沥青再生剂,制备出符合JTG F40-2004标准中2-2气候分区中所要求的A类90#沥青。考察该再生沥青在老化过程当中主要理化性质的变化,并与辽河AH-90高升工地沥青抗老化性质作对比实验。结果表明,所制备的再生沥青抗老化性质较补充到废旧沥青当中的新沥青抗老化性质稍差。本实验采用失重系数法考察沥青的抗老化性质,实验方法较简便结果较准确。     

建筑废弃物再生冗余土制备预拌流态固化土及性能研究

再生冗余土作为建筑废弃物资源化利用处理的副产物,具有成分组成复杂、含泥量高等特点,相较已经得到成熟应用的再生骨料,再生冗余土的研究与应用相对较少。为解决其资源化利用难题,采用再生冗余土作为原料,水泥、钢渣粉、粉煤灰作为固化剂制备预拌流态固化土,研究加水量、固化剂掺量与组成对预拌流态固化土工作性能与力学性能的影响。结果表明,通过调整加水量与固化剂掺量,可制备坍落度80~240 mm的再生冗余土-预拌流态固化土,28 d龄期强度介于0.68~9.54 MPa,作为低成本回填材料可以替代素土或素混凝土回填,有效消纳冗余土的同时实现与工业固废的协同利用。     

回收HMX基炸药制备民用耐热炸药性能研究

利用回收HMX基炸药制备民用炸药H781A,对该炸药药粉在产品组成、热安定性、机械感度等性能和装药的高温安全性、使用性能以及穿深性能进行试验。药粉试验结果表明,该产品符合民用炸药产品验收规范;装药试验结果表明,H781A与民用炸药H781性能相当。因此,由废旧HMX基炸药回收制备的耐热炸药H781A,可安全、有效地装填射孔弹进行高温射孔作业。     

Powder adhesive moulding of recycled expandable polystyrene

Abstract

Expandable polystyrene (EPS) has been used in numerous and varied applications. Its products are commonly made via the steam injection moulding process. This paper discusses a new process approach using ground recycled EPS mixed with powder adhesive to produce the specimens. Adopting the design of experiment approach, the amount of recycled EPS was found to be the most significant controlling parameter for this process. The optimal process conditions and empirical relationships for good bead fusion were also established and the specimens derived were found to be good and comparable with those of steam injected moulded ones. Common causes of failures were also identified.