Simple improvement device for airflow mill filter

Abstract

The invention discloses a simple improvement device for an airflow mill filter. The simple improvement device comprises a first-level cyclone separator and nano-level filters. The simple improvement device further comprises at least one second-level cyclone separator. The second-level cyclone separators are connected between the first-level cyclone separator and the nano-level filters in series. The simple improvement device further comprises magnets arranged at the outer portions of the second-level cyclone separators. According to the simple improvement device for the airflow mill filter, a strong magnetic field is exerted on the second-level cyclone separators, on one hand, ultrafine powder entering the second-level cyclone separators is magnetized and gathered, the weight of single powder is increased, and therefore the powder can be better separated; and on the other hand, through the strong magnetism environment, the centripetal force and the flowing speed of the ultrafine powder are reduced under the action of magnetic force, the powder cannot ascend along with airflow, the separation effect is improved, and most of ultrafine powder is prevented from entering the nano-level filters.

Description

technical field [0001] The invention relates to the field of NdFeB production and sintering, more specifically, it relates to a simple improvement device for a jet mill filter. Background technique [0002] Jet mill is the key equipment for producing high-performance rare earth permanent magnet materials. It has the characteristics of no pollution, no oxidation and good particle size distribution. [0003] Traditional jet mill equipment realizes gas-solid separation through a first-stage cyclone separator and a nanoscale filter (a nanofilter is usually equipped with multiple nanoscale filter rods). Among them, most of the particles above 1 micron are collected in the primary cyclone separator, while the particles below 1 micron are captured in the nano-scale filter, thus realizing the pure gas circulation. However, with the prolongation of grinding time and the increase of ultra-fine powder, the filtration effect of the nano-scale filter will deteriorate, the separation eff...

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Problems solved by technology

However, with the prolongation of grinding time and the increase of ultra-fine powder, the filtration effect of the nano-scale filter will deteriorate, the separation efficiency of the system will deteriorate, and the particle size distribution of the product will deteriorate. At this time, the equipment needs to be shut down for cleaning; even if it is timely Shutdown cleaning, due to the super-adhesive properties of rare earth permanent magnet ultra-fine particle size powder, it is difficult to clean up at one time, and oxidation treatment is often required to achieve thorough cleaning, which reduces the effective running time of the equipment and product stability, which is not conducive to air flow Continuous production of grinding equipment

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