《超细粉碎工程》

本书以超细粉碎设备及其应用为主线、系统总结了超细粉碎基础理论和工程实践以及粒度检测原理和方法。全书共分15章，内容包括了与超细粉体制备和分级有关的基础知识、基本原理、粒度和粒形表征，超细粉碎工艺与设计，机械冲击式粉碎机、气流粉碎机、搅拌磨、振动磨、砂磨机、旋转筒式球磨机、辊磨机、胶体磨等超细粉碎设备、干式和湿式精细分级设备及超细粉碎工程中的辅助设备，同时还包括了近年来为解决废橡胶、塑料、电线电缆等循环或综合利用的特种粉碎设备。     

湿法制备超细粒碳化硅微粉试验研究

某特种陶瓷对原料要求平均粒度达到亚微米级,对原料中杂质铁含量要求也较高,以干式气流粉碎物料为试验样品.通过选矿和化学处理除铁,提纯后的产品利用湿式高速搅拌磨机超细磨,高速卧螺离心分级机分级,过滤、真空干燥得到特种陶瓷用碳化硅微粉.     

气流粉碎机简述

<正> 一、前言 粉碎是利用机械力破坏固体物料的内聚力使其断裂而减小固体物料几何尺寸的过程。粉碎机械通常可分成四类,即粗粉碎机、中粉碎机、细粉碎机和超细粉碎机。球磨机、振动磨、锤式粉碎机、气流粉碎机等均属超细粉碎机,一般其能将物料粉碎到44μm(325目)以下(进料尺寸为2～20mm) 。 气流粉碎机(又称流能磨),与其它超细粉碎机不同,是在高速气流作用下,物料     

微粉碎机的特性及发展动向

微粉碎机可分为球磨机、辊磨机、高速冲击式粉碎机、研磨体搅拌磨、气流粉碎机五大几种,各有其特性及应用性。根据现代工业发展需要,有待在微粉化、高效率化、多功能自动化等方面提高微粉碎机性能。     

微粉碎机的特性及发展动向

微粉碎机可分为球磨机,辊磨机,高速冲击式粉碎机,研磨体搅拌磨、气流粉碎机五大几种,各有其特性及应用性,根据现代工业发展需要,有待在微粉化,高效率化,多功能自动化等方面提高微粉碎机性能。     

新一代XFJ超细粉体分级机研制成功

一种可与任何类型超细粉碎机配套，适用于食品、医药、化工、建材、包装等行业的新一代超细粉体分级机，由浙江丰利粉碎设备有限公司在综合分析、吸收消化国外多种分级原理及设备的基础上，采用液体力学原理研制而成。     

行星搅拌球磨机超细粉碎机理分析

描述了行星搅拌球磨机的工作原理,针对物料在其中被粉碎时复杂的运动轨迹和受力方式,通过对超细粉碎过程的颗粒粉碎速度、颗粒碰撞速度的数学分析以及从流体力学角度对湿法粉碎机理的分析,综合分析了利用行星搅拌球磨机制备超细粉的机理。     

超细气流粉碎—分级系统压力参数的确定与分析

工质压力是超细气流粉碎－分级系统至关重要的参数，喷射工质压力、与其匹配的引射工质压力，气流粉碎机的背压、离心式超细空气分级机的压力场，均将直接影响系统的粉碎性能与分级性能。     

水煤浆制浆工艺与专用设备的新发展

介绍了我国制浆工艺及专用设备的发展情况,新的生产工艺有低阶煤分级研磨高浓度制浆工艺、柯林斯达制浆新工艺、洪威高新能源制浆工艺、干法制浆工艺、辊压与球磨工艺;新的破磨设备包括高效节能破磨机、XP系列破碎机、反击(锤)式细碎机、超细预磨机、辊压粉碎机、新型立式超细磨机、高效制浆专用磨机和立式超细搅拌过滤磨机。     

我国废旧线路板回收利用与无害化处理技术获得重大进展 首条年处理万吨级废旧线路板成套设备通过鉴定 "电子废弃物"变成"再生资源"成为现实

国家废旧家电及电子产品回收处理体系建设试点省市之一的浙江省爆出新闻:由该省重点省级研发中心、国家重点高新技术企业--浙江丰利粉碎设备有限公司研发的FXS废旧电子线路板回收处理成套设备,于2004年12月25日在杭州通过省级新产品鉴定。专家认为该设备采用先进的物理法回收工艺:废旧线路板→强力破碎→磁选→中碎→精细粉碎→超微分级→高压静电分离→成品;所研制的强力破碎机、中碎机、精细粉碎机、超微分级机、高压静电分离等     

我国超细粉碎设备的发展前景与努力方向

随着超细粉体在诸多领域广阔的应用前景,对超细粉碎及超细分级设备的制造精度、产品细度、生产能力以及不同规模配套的粉体生产线提出了新的要求。根据我国超细粉碎设备制造尚没有统一的行业标准,研发力量薄弱等问题,提出了今后努力方向。     

物料自粉碎技术初探

根据球磨机的研磨原理，提出了物料自粉碎技术，从而降低了研磨成本，提高了研磨效率，保证了料浆质量。     

NUMERICAL STUDY OF CLASSIFICATION OF ULTRAFINE PARTICLES IN A GAS-SOLID FIELD OF ELBOW-JET CLASSIFIER

Computational fluid dynamics (CFD) is applied to develop a novel submicron air classifier. Based on various sizes and positions of the inner structure of the elbow-jet classifier, its two-dimensional airflow field has been simulated by the Fluent software. For this typical cross-flow field, the standard k ? ? turbulence model is applied. The Coanda effect plays a paramount role in separating ultrafine particles in the high-speed flow field of the elbow-jet classifier. The factors that influence the performance of the Coanda block, i.e., a quarter-cylinder centered in the classifier, are analyzed and discussed. The trajectories of moving particles with different diameters in the channels and chamber of the classifier have been calculated through the velocity field obtained from the CFD simulation. The cut sizes of three products from three outlets of the classifier are obtained based on the calculations of the trajectories of particles and are compared with corresponding experimental results. The ground and classified experiments have been studied simultaneously where the product outlet of a vortex jet mill is used as the feed in an elbow-jet classifier. The combination of the vortex jet mill with the external classifier provides an alternative to grinding equipment for multiple-size products of fine/medium/coarse powder. A centrifugal channel is added between the vortex jet mill and elbow-jet classifier to improve the performance of the air classifier. Both numerical and experimental results show that the pre-distributed feed particles at the exit of the centrifugal channel have a considerable effect on the separation of fine powder and a lesser effect on the separation of coarse powder.     

半终粉磨钢渣微粉生产线的设计和实践

钢渣微粉化是解决钢渣终端利用的有效途径,但采用传统粉磨工艺无法有效解决钢渣微粉生产中的除铁难题,同时也无法保证钢渣微粉产品的稳定细度和活性。采用带辊压机半终粉磨的圈流高细磨钢渣微粉粉磨工艺,可以充分发挥和利用辊压机的挤压优势和球磨机的研磨功能,达到显著改善产品性能、增产节能,又能高效除铁的效果,是当前钢渣固废利用的可靠有效方案。经优化比较和生产实践,建议在新建或改造钢渣微粉生产线时,以控制辊压机与球磨机的装机功率比在0.6~0.7,球磨机的长径比控制在3.5~4.0为宜。     

Influence of crushing equipment on the elementary composition of coke

The influence of grinding equipment on the contamination of the initial material is investigated. In particular, coke of different structure is ground using a drum-type ball mill, a roller mill, and a jet mill. Conclusions are stated regarding the strength of coke as a function of the microstructure (point score) and the increase in impurity content as a function of the equipment employed. Recommendations for reducing the impurity content are made when grinding coke of different structure.     

Empirical and scale-up modeling in stirred ball mills

Stirred ball mills are frequently used for ultrafine- and nanogrinding in food, pharmaceutical and chemical industry, but only few investigations have been published on empirical or scale-up modeling of stirred ball mills. Experiments have been carried out with a laboratory scale stirred ball mill. During the experiments the main technical parameters such as stirrer speed, grinding media, filling ratio, grinding time and the solid mass concentration have been systematically adjusted. The particle size distribution of mill products can be well estimated by empirical functions, so an empirical model has been prepared for the laboratory mill. The relation between the grinding fineness, grinding time and specific grinding work was represented for several materials such as pumice, andesite, limestone and tailings of ore mining industry. The power consumption of the stirred ball mill for scale-up was determined by a method based on the dimensional analysis. A new scale-up model has been presented as well by with industrial size stirred ball mills can be designed on the basis of the laboratory measurements.     

水射流解离煤的分形特征

利用高压水射流粉碎机与球磨机对煤进行超细解离,对解离后的煤颗粒进行了扫锚电镜分析,利用扫锚电镜图像。基于图像处理技术与分形理论,计算了粒度分布分形维数、边界形状分形维数与节理表面分形维数。利用上述3种分维数对解离后的煤颗粒的分形特征进行了研究。     

Optimization of variables in grinding brass particles for paint and pigment industry

Flaky metal powders commonly used as paint and pigments, are generally produced by grinding in ball mills or vibration mills. The key to good quality powder production is to optimize the processing parameters. In the present work grinding of brass particles is studied in detail in a laboratory size ball mill to determine the optimal levels of the ball to material ratio, type and amount of additives, mill speed, ball load, etc. The quality of the powder is assessed on the basis of water coverage, degree of flattening and luster by visual inspection. Preliminary results in a 35 cm diameter ball mill with 30% ball load show that a material to ball ratio of 0.067 with a 0.1% dosage of stearic acid is required for good quality powder. For determining optimal mill speed and ball size a 2² factorial design of experiment has been followed. It has been determined that to achieve best powder quality the mill must run at 70% critical speed and the ball size must not exceed 20 mm. The quality of the powder assessed through SEM study for surface morphology and particle size analysis compares very well with the industrial samples.     

水泥熟料的粉磨动力学研究

采用行星磨对水泥熟料进行不同时间段的研磨,通过测定粉磨产物的粒度分布、比表面积和45 μm筛余值,以Rosin-Rammler-Bennet(RRB)方程作为粒度分布模型,运用线性回归分析和粉磨动力学的特征粒径分析的方法,对熟料进行了粉磨动力学研究和粉磨性能评价.实验结果表明:经过研磨后,水泥熟料粉体的比表面积、特征粒径和均匀性系数与粉磨时间的对数或双对数呈线性关系,熟料的粉磨速度方程为dS/dt=170.66/t,且熟料粉磨细度不宜高于550 m~2·kg~(-1).