Fluidized-bed Jet Mill | Global Trade leader ecrobot

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Fluidized-bed Jet Mill

Posting date : Apr 15, 2008

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MACHINERY & ELECTRICAL | Nuclear re

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原理流化床气流粉碎机是一种用高速气流来实现干式物料超微粉碎的设备，它由粉碎喷嘴、分级转子、螺旋加料器等组成，物料通过螺旋加料器进入粉碎室，压速空气通过特殊配置的超音速喷嘴向粉碎室高速喷射，物料在超音速喷嘴射流中加速，并在喷嘴交汇处反复冲击、碰撞，达到粉碎。被粉碎物料随上升气流进入分级室，由于分级转自高速旋转，粒子既受到分级转子产生的离心力，又受到气流粘性作用产生的向心力，当粒子受到离心力大于向心力，即分级径以上的粗粒子返回粉碎室继续冲击粉碎，分级径以下的细粒子随气流进入旋风分离器、捕集器收集，气体由引风机排出。特　点 1 、粉碎范围广, 粉碎细度可以达到2微米,且可以根据要求任意调节粉碎细度. 2 、磨损小，由于主要粉碎作用是粒子相互碰撞，高速粒子与壁面很少碰撞，可适用于粉碎莫氏硬度九级以上物料。 3 、无污染，因为是物料在气流带动下自身碰撞粉碎，不带入介质，这样物料在粉碎过程中不会构成污染。 4 、不升温，由于物料是在气体膨胀状态下粉碎，所以粉碎腔体温度控制在常温状态，温度不会升高。 5 、对易燃，易爆易氧化物料可用惰性气体作工质粉碎。适用范围　　该机广泛应用于西药、中药、农药、化工、冶金、非金属矿、滑石、重晶石、高岭土、石英、石墨、阻燃材料、高级材料、陶瓷等干粉类物料的超细粉碎。 Fluidized-Bed Jet Mill Principle The fluidized-bed jet mill is such a device as using the high-speed air flow to perform the dry-type superfine pulverizing. It consists of milling nozzle, grading the screw feeder to the milling chamber, where the high-pressure air is activating the high-speed injection by means of special ultrasonic nozzle. Therefore, the materials will be ground by being accelerated, impacted and collided repeatedly in the midst of ultrasonic injection Flow. The ground materials will brought together with up flow to the grading chamber. The centrifugal force produced by the fast rotation of grading rotator together with the centripetal force by the pneumatic adhesion act on the grading grains. When the centrifugal force on the grain is greater than the centripetal force, the coarser grains above the grading range will be swirled back to the milling chamber for further milling. The thinner grains below the grading range will be blasted to cyclone separator and collector, whereas the purified air will be vented outside from the draft. Features 1, Endurance, Applied to materials with Moth's Hardness below Grade9, since the milling effect only involves the impact and collision among the grains rather than the collision with the wall. 2, Wide Grading Range,d97=2~15um 3, No contamination, The whole process is contamination-free as the materials are moved by the airflow and ground through the collision and impact among themselves without involving the media. 4, No rise in temperature, The temperature will not increase as the materials are pulverized under the working conditions of pneumatic expansion and the temperature in the milling cavity is kept normal. 5, Inert gas can be used as media for milling of flammable, oxidable and explosive materials. Application Scope It is widely applied to superfine pulverizing for graphite fire retardant materials, chemical, smelt, pharmacy, traditional Chinese medicine, agricultural chemical and ceramics, as well as for such dry powders as highly adhesive and superfine pesticides. The unit can be used to pulverize flammable, explosive and easily oxidative materials.