In 2019, my country's airflow milling market, the demand for medical sectors is the largest, reaching 27%; next is the field of new materials and chemical industry, demand proportion is 11% and 10%; biological, non-metallic The needs of mine and equipment manufacturing are between 5% and 7%; the demand in new energy and food sector is between 4% -5%; other areas are all over 3%. Pharmaceutical, new materials, and chemical industry are an important downstream application market for gas flow grinding in my country.
The material is deformed, the crushing process is very complicated, the airflow pulverizer is not an isolated system, but an open system with substance and energy exchange with the outside world, is also a spiral evolution process of a steady-state gradient At the same time, the dissipation of energy and other energy is accompanied. To complete the system, establish a material smashing power consumption, need multidisciplinary theory, under the premise of multi-discipline cross-integration, to establish a power consumption equation may be more complete and comprehensive, in order to reveal the material smash this complex system Intrinsic evolution mechanism. Based on fluidized bed airflow pulverization mechanism, the effect of working pressure and nozzle in the pulverization chamber on the morphology of SiC particles.
The average particle size of the material after the gas flow is thin, the particle size distribution is narrow, the surface of the particles is smooth, the particle shape is standard, the purity is high, the activity is high, and the dispersibility is good. The low melting point and thermal material and biologically active article can be pulverized (because the airflow pulverizer is powered by compressed air, the adiabatic expansion of the compressed gas at the nozzle will reduce the temperature of the system), statistical display, about 25% of the international airflow mill It is ultra-fine preparation for drugs. Moreover, if N2, CO2 is used, a pulverization in an inert atmosphere can be performed in a special occasion. The gas flow is pulverized in a sterile state; the production process is continuous, the production capacity is large, self-controlled, and the automation is high. Since the pulverization mechanism is mainly self-grinding of the interaction between the powder, the product is not easily contaminated by other substances, and high-purity ultrafine powder can be obtained. According to the material of different properties, the corresponding lining material can be selected, so that there is a problem, the problem brought by the material in the pulverization, the structure is simple, no operation of the component, except for the liner, other components It is generally not damaged. The entire crushing process is sealed, no dust is flying.
In general, the micron-stage product can be obtained, and the material can be obtained according to the material properties, the inner wall is made of stainless steel material, which is better to prevent iron, and the pollution of iron is to be the principle of gas flow. Self-grinding of the particles, so the product is contaminated, so that the high purity product is obtained. The compressed gas of the gas flow pulverizer passes through the nozzle due to the cooling effect produced by the adiabatic expansion, so that the pulverization is low-temperature, and the heat sensitive The advantages of substances are particularly significant. The crushed material moves with airflow to the classified area, separating the crude material by the variable frequency adjustment, and the product that meets the fineness requirement is collected with the airflow into the cyclone collector and the crude material returns secondary comminution. The material is subjected to a strong impact of the high-speed rotation of the pulverization plate, and the action of the centrifugal force is collided with the crushing ring gear, and the material is used by shear, friction, collision. The pulverized, the pulverized material is moved with the airflow to the grading area, and the crude material is separated by the variable frequency adjustment. In order to make the performance of the airflow pulverizer become stronger, it is necessary to have a continuous improvement in crushing technology.
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