Learn more about the benefits of fluidized bed jet mills

Since the advent of jet milling and grading equipment in the 1930s, the types have been continuously updated and the structure has been continuously improved. Bed (on-spray) jet mill, etc.

The fluidized bed jet mill is a new model developed and put into use by a German company in the late 1970s and early 1980s. It has the characteristics of low energy consumption, light wear, low pollution, low noise, fine particle size and relatively uniform distribution of products, etc. Resins, phenolic resins, PVC, pigments and dyes, powder coatings, couplers, pharmaceuticals, cosmetics, advanced ceramics, magnetic powders, abrasives, metal powders, food, fragrances, stearic acid, fats, waxes, mineral powders, and pesticides and wettability It is widely used in the production of powder and so on.

Main Advantage

(1) Change the line and surface impact crushing of the traditional jet mill to the three-dimensional impact crushing of the space, and make full use of the high-speed airflow generated by the jet impact in the flow of materials in the crushing chamber, so that the crushing area is similar to a fluidized state Excellent gas-solid crushing and graded circulation flow effect, which improves the efficiency of impact crushing and the comprehensive utilization of energy. Compared with other traditional methods, the energy consumption is reduced by 30-40% on average;

(2) Since the impact crushing area and the gas-solid flow belt are placed in the middle space of the crushing chamber, the impact and abrasion of the materials driven by the high-speed airflow on the wall of the crushing chamber are avoided, and the most serious wear problem in jet impact crushing is improved, and greatly reduced. the potential for the material to be contaminated;

(3) Protective gases such as high-purity nitrogen or argon are used as the working medium to prevent oxidation, and the closed-loop operation has low gas consumption and reduces costs;

(4) There is no dust flying during the complete closed-loop operation, no pollution to the environment, and no harm to the human body;

(5) After jet milling, the activity of the powder increases. The energy of the high-speed jet flow in the jet mill crushing and classification process can not only cause the particles to be impacted and crushed, but also change the internal structure of the particles, especially the surface state, to a certain extent. The energy of the gas flow removes atoms or ions from the particle lattice, causing a mechanical loss of the crystalline structure. In this way, while the powder material is ultrafinely pulverized, the surface energy or internal energy of the particles increases, and the activity of the particles increases. The increase in the activity of the particles is not only beneficial to the chemical reaction, but also beneficial to the adsorption and coating of the particles.

(6) The particle size of the product is fine, the output is large, and it is suitable for large-scale production; the particle size classification accuracy is high, so the particle size distribution of the product is narrow, and the particle size of the product is also easy to adjust.

The fluidized bed jet mill has many advantages such as low energy consumption, small wear and high classification accuracy, and it is widely used in the current ultrafine grinding equipment. However, because there is no specific theoretical guidance, engineering practice is often used to design the structure of the fluidized bed jet mill.

People have done a lot of research on the nozzle, but the research on the flow field inside the fluidized bed jet mill is still limited to theoretical analysis. There are many applications for the pulverization of fluidized bed jet mills, but in the process of jet milling, they often rely on experience to adjust process parameters, lacking the support and guidance of theoretical research.

Therefore, it is necessary to further deepen the applied basic research of the fluidized bed jet mill jet milling process, and strengthen the understanding and knowledge of the fluidized bed jet mill pulverization mechanism. With the continuous development of fluidized bed jet mill pulverization technology and the widening of its application range, fluidized bed jet mill pulverization technology will play an increasingly important role.