Continuous improvement of supersonic jet mill to meet higher requirements

When the compressed gas passes through the feeding ejector, the crushed raw materials enter the crushing chamber. There are multiple crushing nozzles around the crushing chamber, which spray supersonic airflow, so that the materials are impacted by the high-speed airflow and the materials collide with each other to be crushed. The grading wheel separates the particles that meet the particle size, and the coarse particles are circulated back to the pulverizing chamber to continue pulverization. After the internal closed-circuit pulverization, a uniformly distributed ultra-fine powder can be obtained at the discharge port.

1.  Suitable for dry ultra-micro process. Due to the high impact speed, up to 2.5 Mach or more, particles of 1-10 microns (μm) can be easily obtained under normal circumstances, and particles smaller than 1 micron (μm) can also be obtained according to the nature of the material.

2.  Since the pulverizer has a closed-circuit classification mechanism, the coarse particles in the product are continuously circulated and pulverized, so products with uniform particles and small particle size distribution can be obtained.

3.  The equipment has the advantages of short crushing time, simple structure, convenient operation and maintenance, small footprint, low noise (72dB) and no vibration.

4.  High crushing efficiency, continuous crushing can be carried out, and the purity of crushed products can be maintained.

5.  The introduction of the latest German technology, after years of accumulated technical experience, the comprehensive performance of the equipment has been equivalent to the same model imported from Germany and Japan;

6.  It is suitable for crushing, disintegrating, spheroidizing and shaping various powders with Mohs hardness below 10;

7.  After crushing, the fineness of the material can be adjusted between 3~150μm, and the D50 value of some materials can reach 1.5μm;

8.  Because of its special non-medium spray crushing, it is especially suitable for ultrafine crushing of high-purity materials;

9.  No heat is generated during the crushing process, which has an excellent crushing effect on heat-sensitive materials;

10.  Wear-resistant protection: A variety of wear-resistant protection materials can be selected for the inside of the equipment and the grading wheel, such as alumina, zirconia, and organic materials;

11.  Environmental protection and automation design, the system is closed to run without dust leakage, touch screen and PLC automatic monitoring equipment can be selected;

12.  Multi-purpose design: it can be used in series with air classifiers, universal pulverizers, etc., to better meet the powder particle size requirements;

13.  Application fields: chemicals, minerals, traditional Chinese medicine, cosmetics, food, flame retardants, printing toners, activated carbon, resins, etc.;

The supersonic jet mill has the effect of impact shearing on the material and the impact, friction and shearing of the material and other parts to crush the material. Therefore, the average particle size of the material after airflow pulverization is fine, the particle size distribution is narrow, the particle surface is smooth, the particle shape is regular, the purity is high, the activity is high, and the dispersibility is good; it can crush low melting point and heat-sensitive materials and biologically active products (because the airflow The machine is powered by compressed air, and the adiabatic expansion of the compressed gas at the nozzle will reduce the temperature of the system). According to statistics, about 25% of international jet mills are used for ultra-fine preparation.

In recent years, the crushing equipment has been greatly improved on the basis of the previous supersonic crusher, its structure has been continuously improved, and the crushing performance has been continuously improved. In order to meet the higher requirements of the development of information technology, biotechnology and new material technology on the particle size, purity and particle size distribution of powder products, the research of ultrafine jet pulverization technology should focus on the development of the following aspects: To improve and optimize ultra-fine jet pulverization equipment, develop new equipment, and pay attention to the matching design of pulverization and classification systems.