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The compressed air from the compressor of the air jet mill is introduced into the mill. The raw material is sent to the pulverizing chamber at a supersonic speed by a push nozzle and a venturi nozzle. In addition, high-speed compressed air is injected from a plurality of grinding nozzles, and the material particles in the gas flow in the pulverizing chamber are pulverized by the strong impact. The pulverizer is provided with a sorting chamber for sorting the particles in the high-speed swirling flow, and the micro-powder-eight-collecting system that loses the centrifugal force becomes the finished product, and the coarse particles are settled to the pulverizing chamber along the outside of the swirling flow under the centrifugal force, so that It was crushed again.
The flow bed type jet mill material is transported from the check valve to the storage hopper, and sent to the grinding chamber through the screw feeder. The supersonic air enters the grinding chamber through several nozzles and is concentrated to the center to make the material fluidized. The ground material is comminuted under a strong impact. The pulverized material fluid rises for classification and collection. The coarse particles are settled back to the pulverizer grinding chamber and then pulverized. Since the high-speed particles do not collide with the machine wall and no material passes through the nozzle, the grinding machine does not cause wear during processing.
In order to prepare ultrafine powders, various types of superfine pulverizing equipment have been developed in various countries. Jet jet mills are one of them. The equipment has the advantages of non-contamination of materials, high grinding degree (particle size up to 5 mixing m, low energy consumption, less equipment wear, low noise, easy cleaning, etc.), suitable for pulverizing high purity, heat sensitive and difficult to pulverize layered structure. In order to develop advanced refractory products, it is important to increase the amount of ultrafine powder in the ingredients to improve the performance of the products. Therefore, jet pulverizers are used in the refractory industry, but because of the high cost of equipment, only for special Processing of raw materials for refractory products. Working principle The jet mill uses steam, compressed air or other gases to inject into the machine at a certain pressure to produce a high-speed rotating vortex, so that the material particles in the machine rotate with it, and during the rotation process. The collision between the granules and the granules is caused by collision, impact, and grinding. Types and structures commonly used are double jet pipe jet mills, airflow mills, and flow bed jet mills. The airflow uses compressed air. The compressed air coming out of the machine is introduced into the mill after drying, filtering, degreasing and water removal, and the pressure is about .6 MPa. The crusher material is sent to the pipeline of the ascending airflow by the screw feeder. After the machine settles, it is accelerated by the spray pipe to the supersonic speed, and is introduced into the crushing chamber of the crusher. The materials collide with each other at a higher relative speed. The pulverized material forms a fine powder. The pulverized material is brought into the classifier by the air flow, and the fine powder that loses the centrifugal force is introduced into the micropowder collection system by the airflow to become a micropowder product. The coarse particles are settled along the casing by centrifugal force, and again enter the injection pipe for secondary pulverization. Until the powder is reached.
Jet mill counterflowimpactmill