Maschinentechnische Beeinflussungsmöglichkeiten des Zerkleinerungsergebnisses bei der Prallzerkleinerung von Gasflammkohlen

Factors affecting the comminution of medium‐volatile bituminous coal in a universal impact mill are rotor geometry, rotor speed and sieve opening geometry. Product properties like mean particle size and width of the product particle distribution are also influenced as well as energy efficiency. The result of comminution for medium‐volatile bituminous coals and the universal impact mill used depends mainly on the geometry of the sieve openings and on the rotor speed. By changing the sieve opening geometry the width of the product particle size distribution can be influenced.     

扁平式气流粉碎机超微粉碎布洛芬的工艺研究

采用扁平式气流粉碎技术进行了布洛芬微粉化试验研究,考察了工质压力、进样速度、布洛芬原料粒度及分布等对布洛芬微粉颗粒大小和粒径分布的影响.实验结果表明采用扁平式气流粉碎技术进行超细粉碎,可使布洛芬微粉平均粒径达到6μm,达到制备布洛芬缓释胶囊的要求.     

盘式辊压破碎机能耗模型及优化

以并列双系统、3级粉碎样机为例,建立盘式辊压破碎机整机理论能耗模型。利用邦德功耗理论,给出第1级磨辊能耗计算式。以盘辊料层挤压分析为基础,给出第2,3级磨辊能耗计算式。通过钢渣粉碎试验,研究盘辊间隙、磨辊力和磨盘转速对粉碎效果与料层稳定性的影响,确定这些参数的临界值或取值区间。通过四因素三水平中心复合试验,利用响应面法构建整机试验能耗模型。理论能耗模型具有通用性,可以用于设备设计和结构参数优化。试验能耗模型能对设备能耗进行局部试验分析,检验和校正理论能耗模型。以整机最小单位能耗为目标进行参数优化,在保证第2级磨辊力有效利用率和下磨盘受力均衡的情况下,使设备单位能耗和第2,3级磨辊力峰值均有约10%的降幅。     

魔芋粉湿法微粉碎机械力化学效应研究

研究湿法微粉碎对魔芋粉产生的机械力化学效应。结果发现 ,经湿法微粉碎处理 ,魔芋粉的粒径由原精粉的 87 47%以上不能通过 12 0目筛变为 95 5 4%以上能通过 12 0目筛 ,魔芋粉颗粒形态由椭球形异细胞变成不规则的微小碎片 ,但颗粒总体粒度和形态较为均一 ;经湿法微粉碎处理后 ,魔芋粉葡甘聚糖重均分子质量由 1 5 6× 10 6u下降为 0 83× 10 6u ,魔芋粉色度得到一定改善 ,充分溶胀时间由 2 40min缩短为 60min ,溶胶粘度由 2 94Pa·s提高为 8 2 8Pa·s ;凝胶强度由 5 1 3 0Pa增强为 5 8 94Pa。     

利用辊压机联合粉磨系统进行高炉水渣粉磨的技术探讨

针对辊压机在联合粉磨系统中进行高炉水渣粉磨中出现的问题,现场对设备及工艺参数进行了分析,查明了出现问题的原因,提出了初步解决措施,使辊压机在挤压高炉水渣时处于平稳运行状态,并提出了进一步完善辊压系统的措施和方法。     

A novel PM-wear protection method to meet high comminution demands

High-pressure grinding roller presses have been used to an increasing extent in recent years for grinding cement because of their better energy utilization. However, the service life of the roller surfaces, an important factor in the cost-efficiency of high compression comminution, still needs to be improved. This formed the background for the introduction of a novel wear protection called HEXADUR^®, in which a very hard, wear-resistant, roller surface is generated by a special combination and distribution of two different materials in a selected pattern. The new HEXADUR^® wear protection system is based on a fundamental examination of the wear system occurring during high compression comminution.     

超细粉碎与分级技术进展

结合作者的研究开发工作,从超细粉碎技术的应用、超细粉碎设备和超细分级技术的研究与开发３ 个方面综合评述了该技术的现状。对比国外同行的水平,分析了国内相关技术和研究的特点,对超细粉碎分级技术今后的发展提出自己的观点     

非金属矿超细粉碎中的几个问题

超细粉碎与分级技术是非金属矿深加工的重要手段之一,作者对国内涉及到的超细粉碎设备,工艺,产品粒度等方面的问题提出了自己的见解,以求起国内同行的重视。以利超细粉碎技术的发展。     

The effect of abradant particle comminution on the intensity of three-body abrasion

An attempt has been made to understand why testing involving abradant particles leads to inconsistent results, despite identical test conditions. The work undertaken involved experiments on a rubber wheel abrasion tester (RWAT), and found comminution of the abradant to be the omitted factor: careful examination of the abradant particles after each test revealed that, even for the lowest load, the particles did not remain unbroken. The results obtained showed that at least part of the variation between tests carried out under nominally identical conditions can therefore be ascribed to ignoring the effects of size reduction. The paper concludes by recommending some changes in standard procedure.     

Method of abrasive wear testing in comminution processes

The abrasive wear properties of materials in sliding contact with solid mineral particles during a comminution process have been studied. The equipment used can simulate tribo-conditions inside coal pulverisers. Using the experimental apparatus, a number of different materials have been tested and classified according to their resistance to abrasive wear in rubbing contact with particulate coal. The method and principles of three new rigs have been described in the previous paper (see p. 235).