Air classifier technology is becoming more and more important in the powder processing industry
The raw material of the air classifier is not only the basis for the preparation of structural materials, it is also a material with special functions, such as fine ceramics, electronic components, biological engineering treatment, new copy materials, high-quality refractory materials, and materials related to fine chemicals. Required by the field. With the more and more widespread application of air classifiers in modern industry, the status of air classifier classification technology in powder processing is becoming more and more important.
Main research trends of super subdivision
(1) Research and develop new powerful dispersion devices. At present, physical methods and chemical methods have been applied. In the chemical method, it is commonly used to add a dispersing aid to the material before classification in the previous pulverization process, but this method will increase the production cost, and the dispersant may pollute the material, so it is only used in special circumstances. Commonly used physical methods are mechanical or high-speed compressed air dispersion devices, of which high-speed compressed air is the most used. In addition, the chemical method of surface modification to disperse particles is another important way for ultrafine dispersion.
(2) Research on hierarchical flow field. Analyze the flow characteristics of the classification flow field of the turbo-type air classifier and the movement of the classification particles (mainly the movement characteristics of the gas-solid two-phase flow), clarify the influencing factors of the classification flow field, design a reasonable structure form, and reduce local vortices The generation of the grading flow field makes the flow state of the graded flow field as uniform as possible.
(3) The design of the grading force field and the exploration of new grading principles. Through the study of particle surface characteristics, interface states, and the behavior differences of particles in different media and different force fields, new principles, methods and approaches are found, stable and adjustable force fields are designed, and a new and more refined superfine level is developed. machine.
(4) Research on performance parameters and system operating parameters. Through the study of the characteristic parameters of the classifier and the analysis of the operating parameters of the classification system (or crushing-classification system), the classification equipment of reasonable specifications is designed, and the structural parameters and system operating parameters are optimized to make the classification equipment in an ideal working state, that is, high efficiency. , Energy saving and low consumption.
(5) Research on corresponding measures for other problems in the super-subdivision process. For example, in view of the explosion hazard of ultra-fine powder, research on inert gas as a grading medium is carried out; for the tensile test of ultra-fine powder, the development and research of testing devices with good dispersion performance and standard operation can be carried out.