As the speed of the classifier increases, the particle size of the graphite powder gradually becomes finer. According to the principle of airflow classification, the grading power is to use the rotation of the classifier impeller to form a centrifugal force field. The particles at any position on the rotating flow section are simultaneously subjected to centrifugal force F (director wall) and airflow centripetal force R (pointing to the rotor center). If the tangential velocity of the particles and the tangential velocity of the swirl are equal, the centrifugal force F It is: F=Pd3(Qs-Q)V2t6r where: d, particle diameter; Qs, particle density; Q, gas density; Vt, tangential velocity of swirl; r, rotor radius. Assuming that the radial velocity of the particles is equal to the radial velocity of the gas flow, according to Stokes' law, the centripetal force R is related to the viscous system L of the gas stream and is proportional to the particle size d and the radial velocity Vr of the swirl: R = 3PLVrd Where: Vr, radial velocity of the swirl; L, viscosity coefficient of the gas stream; d, particle diameter. According to the above formula, for graphite particles (F>R) having a particle diameter (d) greater than 3Vt2LrVrQs-Q, the moving wall falls into the feeder and is subjected to secondary pulverization, and the graphite particles having a fine particle size are moved to the rotor. Center, discharged outside the classifier (F
The influence of the speed of the induced draft fan: fixed working pressure P=0.60MPa, classifier speed N1=40Hz and secondary air inlet opening K=75%, adjust the speed of the induced draft fan, the test result, with the speed of the induced draft fan, the particle size is 20Lm The cumulative volume distribution of graphite powder is significantly reduced. The induced draft fan is an important part of the CP-11 air classifier. Its function is to establish the supersonic flow field of the pulverizer and overcome the resistance. The faster the speed of the induced draft fan, the greater the pumping force and the coarser graphite powder. The body is forced into the collector and the resulting product has a coarser particle size. Therefore, adjusting the speed of the induced draft fan can significantly affect the particle size of the graphite powder.
Under the premise of satisfying the establishment of flow field, the effect of working pressure P on changing the particle size of graphite powder is not obvious. By changing the secondary air inlet opening and increasing the secondary air inlet amount, the particle size of the graphite powder can be significantly thickened. Adjusting the speed of the classifier can significantly change the particle size of the graphite powder. With the increase of the speed of the induced draft fan, the content of fine powder can be reduced, and the particle size of the finished graphite powder can be obviously adjusted. According to the graphite powder produced by the process described in this paper, lithium ion battery samples have been assembled in the laboratory, and their indexes have reached the level of commercially available products, and individual performance is even better than imported products.
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