正交试验法在汽车涂料选材中的应用

介绍了在汽车涂料选材过程中,应用正交试验的可行性.通过对清漆选材DOE案例进行描述,找出较优水平,经过验证确定最佳的清漆材料以及配套的工艺参数.强调了在汽车涂料选材过程中要寻求合适的方法,以期得到事半功倍的效果.     

硫铵母液储槽选材的研讨

介绍硫铵母液储槽的应用情况和选材对储槽使用的影响,防止选材不当造成的浪费与事故.     

ABS塑料作银锌蓄电池壳体

叙述银锌蓄电池壳体的选材依据,国内外应用工程塑料简况,选材试验以及应用效果和注意事项。     

双金属复合管液胀成形选材标准理论分析探讨

首先针对当前复合管液胀成形技术现状,对选材标准进行理论分析。然后通过分析衬管和基管在液胀成形复合管过程的应力应变,得到了复合管能够复合的基本要求,结合材料的力学特性,得到了衬管和基管能够实现液胀成形复合管的选材标准。最后利用有限元软件Abaqus进行模拟分析,验证了选材标准的正确性,为复合管液胀成形的初步选材提供了理论支撑,利用相关企业的实际生产,为双金属复合管液胀成形工程实际提供了重要依据。     

管道全压设计分析研究

从管道等级确定,管道选材,阀门选用形式及连接方式几个方面进行了论述,为海洋平台高压管道选材提供了方案。     

关于药型罩材料与工艺技术的分析研究

药型罩作为聚能装药破甲弹的核心元件，其选材和工艺技术已成为国内外研究的热点问题之一。本文介绍了国内外相关领域的研究现状，对药型罩选材和成形工艺作了详细论述，同时提出了粉末金属药型罩的制造工艺技术和选材的发展趋势。     

高温分离器设计

对高温分离器的设计中的选材、斜插管的局部应力考虑、设备螺栓的选材进行分析和讨论,为类似容器的设计提供经验性参考。     

航煤加氢装置管道腐蚀与选材

本文分析了航煤加氢装置管道的腐蚀类型,包括湿H_2S腐蚀、高温氢腐蚀、铵盐腐蚀、高温H_2+H_2S腐蚀。并提出了湿H_2S腐蚀环境选材通常为20#钢并做焊后应力消除热处理,高温氢腐蚀环境选材通常为20#钢和15CrMo,铵盐腐蚀环境选材通常为304L,高温H_2+H_2S腐蚀环境选材通常为321。     

除盐水站管道腐蚀与选材

本文介绍了除盐水站的离子交换法工艺流程,分析了主要的几种腐蚀类型及相应管道防腐选材。并提出了酸液腐蚀环境选材通常为钢衬塑复合管,碱液腐蚀环境选材通常为碳钢并做焊后应力消除热处理,酸碱废水宜选用钢衬塑复合管。     

球磨机磨球选材的两个重要条件

磨球的硬度和韧性是磨球选材时需要考虑的两项重要指标,为此而提出了相应的算式,以期改变过去的选材靠经验、数据靠试验的传统方法。     

研磨介质在细磨煤系煅烧高岭土中的行为与影响

利用戒严型湿式搅拌磨,研究了磨矿介质各行为－－介质种类、介质尺雨配比和介南物料比等对煤系煅烧高土超细磨矿的影响。在优化研磨介质等条件的基础上,进行了模拟生产状态的连续磨矿试验,实现了磨矿产品－２μｍ含量大于９０％的预期结果。     

Using the attainable region analysis to determine the effect of process parameters on breakage in a ball mill

Ball milling is one of the most common unit operations used for size reduction across a range of industries. However, it is also a notoriously inefficient process, often contributing substantially to operational costs. In this work, we investigate the influence of rotation rate, grinding media fill level and grinding media size on the optimal production of a product of intermediate size. We find that changing the grinding media size at otherwise identical conditions produces different breakage products as well as nonmonotonic trends with varying rotation rate and grinding media fill levels. In addition, we show how to use the attainable region analysis to explore the parameter space in a reduced time without having to perform tests at every parameter combination. Finally, we examine how the complex interplay between rotation rate, grinding media fill level and grinding media size can control the mechanism of breakage occurring inside a ball mill. © 2011 American Institute of Chemical Engineers AIChE J, 2012     

Nassmahl‐Technologien mit Mahlkörpern und Lösungsansätze für Zentrifugenmühlen zur Herstellung nanoskaliger Suspensionspartikeln

Wet‐grinding Technologies with Grinding Media and Visions of Solutions for Centrifuge Mills for the Production of Nanoparticles A complete overview is given on the wet‐grinding technologies with grinding media in stirred‐media mills for comminuting and dispersing of organic and inorganic solid particles in suspensions. With regard to the state‐of‐the‐art and long time experience of the chemical, paint‐ and printing inks industries, it becomes clear that further development of wet‐grinding‐technology is necessary in order to satisfy the requirements of the production of nanoparticles with specific functional properties in the future. Visions of solutions are presented and first results are discussed.     

Mechanical production and stabilization of submicron particles in stirred media mills

A joint research project between the Technical University of Braunschweig and the Technical University of München investigates the possibilities for the production of stable product suspensions in a particle size range smaller than 100 nm. This paper shows the experimental setup which allows the measurement of the most important electrochemical properties and the analysis of the particle size distribution of the product suspension as well as an adjustment of the pH value for stabilization during the comminution process. Results for comminution of fused corundum with different grinding media materials and grinding media sizes are shown. In addition, results showing the influence of the electrostatic stabilization on the grinding progress are presented. Further, the rheology of the product suspension is examined depending on grinding progress and suspension stability.     

Naßmahlung in Rührwerksmühlen

Wet grinding in agitated ball mills. To ensure certain product qualities it is necessary to have very fine particles or a narrow particle size distribution. For this process agitated ball mill grinding can be used as well as crystallisation and precipitation. Cost effective grinding of very fine products to a narrow particle size distribution requires that the effects of variation of strain intensity, frequency of impacts, residence time distribution, size of grinding media, viscosity of liquid and concentration of feed material should be known. The most important parameters and their effects on the grinding result are demonstrated, as well as explained by a model, and the consequences for the operating conditions of agitated ball mills are presented. By using small grinding media in agitated ball mills the production rate can be increased, or at the same energy level smaller particles can be obtained by grinding or deagglomeration. At high flow rates and a narrow residence time distribution the feed material becomes more homogeneous. These facts require the development of new or modified types of agitated ball mills.     

Electrostatic Stabilization and Characterization of Fine Ground Silicon Particles in Ethanol

Silicon - Stirred media milling is a common method for the efficient production of nanoparticles. Here the grinding of semi-metallic silicon nanoparticles is presented, which are of special...     

研磨体形状的理论评价方法

研磨体作为传统球磨机的主要工作部件，对粉磨效率的影响极为敏感。研磨体形状对粉磨效率的早为人们所认识，迄今为止，已有许多形状的研磨体投入使用或正在开发，但没有哪一种可称为最佳，原因是目前尚未有完整系统的理论对研磨体的形状作出具体评价和分析。本文根据球磨机的工作原理，对评价研磨体形状的理论方法进行了探讨。     

Inferring the distribution of iron oxidation species on mineral surfaces during grinding of base metal sulphides

Electrochemistry plays an important role in the flotation of base metal sulphide minerals. During grinding a galvanic interaction occurs between minerals and grinding media and controls the iron contamination on mineral surfaces, which depresses mineral flotation significantly. In this study, the galvanic interaction was quantified by measuring the iron oxidation species originated from grinding media by ethylene diamine-tetra acid (EDTA) extraction in single mineral and mixed mineral systems. It was found that the extent of galvanic interaction between minerals and grinding media was intimately associated with the electrochemical reactivity of minerals. The nobler the mineral, the stronger the galvanic interaction with grinding media, and the higher the amount of iron oxidation species from grinding media. For both galena and chalcopyrite a linear relationship was observed between the amount of iron oxidation species and flotation recovery in single mineral systems. This relationship was able to predict the iron oxidation species on galena and chalcopyrite surfaces when they were mixed with pyrite separately. The distribution of iron oxidation species onto the two minerals in the mixture changed with the ratio of the mineral surface areas and was correlated with mineral flotation recovery. The major cathodic mineral in the mixture was dictated by the combination of mineral surface area and reactivity and drew iron oxidation species from the grinding media.     

高铝瓷球常见缺陷及原因分析

在总结α氧化铝粉为主要原料生产高铝瓷球研磨介质生产实践经验的基础上,对高铝瓷球的质量缺陷进行了较为系统的研究分析与总结,并提出了一些有效的处理方法和改进措施以为同行提供参考。     

研磨介质在油墨基料研磨中的应用

介绍不同的研磨介质在油墨中的应用,并讨论了研磨介质的种类,体积比及尺寸对基料细度的影响。实验表明选择合适的研磨介质能提高分散研磨的效率。