Figure 51 is a modified convection jet mill; its main feature is the advantage of a spiral classification mechanism that combines a swirl jet type, an elliptical tube type and a convection jet mill. [next] Figure 52 is an opposed jet mill with a fluidized bed. The material to be ground is fed from the silo to the grinding chamber by the screw 1 and then accelerated by the nozzle 4 for blowing. The accelerated material is pulverized by a strong impact at the "focus" of the nozzle 3. A vertical upward airflow is formed around the "focus" 3, and the pulverized material is driven through the sieve 5 like a "fountain"; the sieved fine material is collected into the cyclone 6 and the dust filter 7, and the coarse material is returned to the layer and then pulverized. [next] Japan has developed a PJM type convection jet mill, which is characterized in that a gas-solid mixture fluid is ejected through a nozzle and pulverized through a supersonic nozzle, instead of the nozzle jetting only as the front jet mill. This mill can be used to treat low melting point, high viscosity, high toughness materials such as paraffin, sorbitol, carboxymethyl cellulose, phenolic resin, epoxy resin, and vinylon, as well as silicon carbide, zircon sand, and manganese dioxide. A substance with a high hardness. Its series of products currently have PJM-200, PJM-280, PJM-380 and PJM-510. [next] The CP type jointly developed by the China Aerodynamics Research Institute and the Chengdu Powder Research Institute is an impact plate type jet mill. The CP type jet mill is used to treat the particle size characteristics of different materials. Nantong Zhongyi Electronic Technology Co., Ltd. , https://www.apl-pickleball.com
The main advantage of the convection jet mill is that the processing capacity is very high. Under the same energy consumption, the unit volume of the mill is 10~100 times higher than that of the ball mill ; the unit power consumption is lower, about 60% of the conventional ball mill; The machine has high pulverization efficiency and good dispersion effect, and can obtain products with a particle size of several micrometers or less; the product has a narrow particle size distribution and can be adjusted in a wide range, which is beneficial to the grinding of cement. For example, can improve the early strength of cement 9.8 to 14.7 MPa (100 to 150 kgf / cm 2), setting time is short, particularly in the grinding capable of controlling the temperature rise, for which the difference between the thermal conductivity and low melting point The ultrafine pulverization of the material and the dissociation of the highly cohesive material all have the unique advantages that other mills do not have.
D Impact Plate Jet Mill Figure 53 shows a jet mill with an impact plate; the high velocity airflow carrying the material enters the crushing chamber and impacts on the counterplate 4 to promote further crushing of the material.