共查询到17条相似文献,搜索用时 113 毫秒
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《中国粉体技术》2016,(1):34-38
采用小型卧式行星磨粉磨水泥熟料,在不同行星因子和入料粒级的条件下,研究粉磨后粉体的粒度分布和粉磨能耗理论。结果表明:所得产物粉体粒度分布符合RRSB(Rosin-Rammler-Schuhmann-Bennett)分布,粉体的均匀性系数约为0.8;当行星因子为14并且粉磨120 s时,80μm筛余质量分数小于10%,45μm筛余质量分数小于30%,粒度分布符合国家标准GB 175—2007要求,此时单位产量能耗为332 J/g;通过对粒度与能耗的关系进行曲线拟合,得到粉碎功指数为1.999 36,数值接近雷廷格粉碎功指数,比表面积增加量与粉磨能耗呈线性关系;在不同行星因子时的雷廷格粉磨能耗理论均适用于卧式行星磨。 相似文献
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《中国粉体工业》2006,(4)
项目概况:层叠式行星环磨是最新才研究发明创造出的一种新型粉体加工机械设备。是当今世界上还没有生产和应用过的粉磨机械设备。已申报国家专利,授权号:ZL200420069444.2。层叠式行星环磨机是一种高效节能,具有独特性能的粉体加工机械设备。其性能、技术处于国际领先。推广应用,对粉体工业具有极高的节能效果和经济效益。粉体工业现代常使用的粉磨设备主要有:球磨机、立磨、锤磨、对辊磨、轮碾磨、震动磨、砂磨、辊碗磨、风扫磨、笼型粉碎机、钢爪粉碎机、涡轮粉碎机、汽流粉碎机、磨粉机等。这些设备虽结构各异,但工作原理都是利用重力、压力、惯性力、摩檫力来将物粒粉碎。加工细粉或超细粉需配置庞大的粉体分级和除尘设备。这些粉磨设备电耗高,占粉体制备生产工业用电量的2/3以上。层叠式行星环磨机是一种利用碾轮沿碾环作轨面行星运动,碾轮作圆周运动产生离心力,由此碾轮与碾环之间形成一股强大的离心力,物粒通过碾轮与碾环之间被离心力粉碎。物粒经过多层的粉碎,便成为细粉或超细粉粉体。离心力可随着线速度加快而增大,离心力越大,物粒就会被粉碎的越细。本设备采用变频调速控制系统,可根据入磨物粒粒度大小、物质硬度、产品细度要求,调整碾轮运行速度,控制出... 相似文献
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Evaluation of process parameters and performance of planetary mills is considered an important issue in optimization of their predicted efficiencies. The current research deals with a computer simulation based on discrete element method (DEM) employed to evaluate the grinding mechanism of a planetary mill. The effect of rotational speed, the volume percentage of the balls and powders on impact energy, the frequency of the impacts, the abrasion of the balls and the dissipated energy have been investigated. It was realized that by increasing the rotational speed, the impact energy and the number of impacts of ball–ball, ball–container, ball–powder, powder–powder and dissipated energy were increased. By increasing the balls filling ratio, the impact energy value of ball–ball remained almost constant after a critical point while those of ball–powder impact energy and the dissipated energy were slightly increased. With an increase in powders filing ratio, a maximum value was observed for the ball–powder impact energy; however, the ball–ball impact energy remained almost constant and the dissipated energy indicates a reduction in rate. 相似文献
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行星球磨机制备甘草超细粉及其抗菌性能 总被引:1,自引:0,他引:1
采用摆动式行星球磨机对中药甘草进行粉碎,分析磨机转速、粉碎时间、磨介质充填率、球料质量比对超细粉体粒径的影响。确定最佳工艺参数为:球磨机转速为300 r/min、粉碎时间1 h、磨介质充填率30%、球料质量比为15∶1。对甘草粉体提取液的抗菌性能进行测试。结果表明:超细粉碎很大程度地提高了甘草有效成分的溶出量,其有效成分提取液对金黄色葡萄球菌和大肠杆菌均有较好的抑菌效果,抑菌率分别达到89.12%和81.76%。 相似文献
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In order to investigate the abrasion phenomena in a planetary ball mill, we conducted the grinding operation without a powder and sought a correlation between the ball abrasion and the ball impact energy estimated by a Discrete Element Method (DEM) simulation. Experimental results showed that the mass of abraded balls increased in proportion to the grinding time in the early stage of grinding up to 75 min. The abrasion rate increases quadratically with the mill rotation speed. It decreases with an increase in ball diameter up to 12.7 mm and then slightly increases when the diameter is 15.8 mm. It also increases with an increase in the ball-filling ratio of the mill up to 50%. Similar tendencies are found in the impact energy calculated from the balls motion simulated by DEM. Therefore, it is said that the abrasion rate has a strong correlation to the impact energy of balls under any milling conditions. 相似文献
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The influence of several grinding parameters such as charged material volume, ball filling ratio, and mill rotation speed on energy efficiency of fine grinding of hydrated lime and the product fineness of hydrated lime was studied experimentally using a laboratory scale ball mill. The product size and surface area of the ground samples were determined with respect to the above variables, and changes in energy input during the grinding were described in detailed. Finally, the optimum conditions for the grinding of the hydrated lime with the ball mill were obtained. The results from this study showed that the ball mill load and mill speed are the most important parameters rather than ball mill charged material volume for the fine grinding of the hydrated lime using the ball mill in terms of energy efficiency associated with external surfaces. 相似文献
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为了评估行星磨的粉磨效率,对卧式行星磨中物料填充率对水泥熟料的破碎速率和初始破碎分布函数进行研究。实验所用的物料填充率为0.07、0.08、0.09、0.10、0.12,物料为>2.36~3.35、>2.0~2.36 mm粒级的水泥熟料,对不同物料填充率下的破碎速率进行比较。结果表明,不同物料填充率下对水泥熟料进行粉磨遵循一级粉磨动力学方程,两个粒级的物料破碎速率都是在填充率为0.10时最大,此时的粉磨速率最快;初步研究认为物料填充率对初始破碎分布参数影响较大;>2.36~3.35 mm粒度的物料填充率为0.07时曲线下半段的斜率最小,下半段的截距和上半段的斜率在物料填充率为0.12时达到最大值;2.0~2.36 mm粒度的物料填充率为0.09时曲线下半段的斜率最小,下半段的截距和上半段的斜率在物料填充率为0.12时达到最大值。 相似文献
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黑索今超细化技术研究 总被引:2,自引:0,他引:2
文章针对如何实现超细黑索今(RDX)的安全连续批量生产问题,提出了采用卧式搅拌球磨机制备超细RDX粉体的工艺方法,介绍了卧式搅拌球磨机粉碎原理,详细分析了卧式搅拌球磨机搅拌器转速、研磨时间、磨球种类、介质球填充率及RDX浆料浓度等工艺参数对超细RDX粉体产品粒度的影响。试验结果表明:搅拌球磨这种粉碎方式能制备粒度为D90=3.05μm的超细RDX粉体产品,工艺安全可控,产品质量稳定。这种超细RDX粉体产品能满足高性能炸药及高能推进剂的需要。 相似文献