Application of Modified Thermodynamic Grinding Theory in Jet Mill |
| D. Urbaniaka, H. Otwinowskia, V.P. Zhukovb, A.Y. Barochkinb, J. Borycaa, T. Wylecia la
aCzęstochowa University of Technology, 42-201 Częstochowa, Poland bIvanovo State Power Engineering University, 153003 Ivanovo, Russia |
| Full Text PDF |
| Two problems are particularly important in the works devoted to the grinding process. One of them (the grinding theory) is the dependence that describes the relationship between the energy supplied to the process and its effect. The second issue is the description of particles size distribution of the grinding product. Grinding theories are generally not universal. They relatively reliably describe the effect of cause-and-effect in the crushing process, others - in the grinding process in mechanical mills, and still others - in the superfine comminution process. The so-called thermodynamic theory of grinding is discussed in the present paper. This theory is a combination of Rittinger's theory and Kick's theory. In relation to the classic form of the theory, a certain modification was proposed, resulting from the authors' own research. The results allowing the verification of the proposed modification are presented. In order to analyze the modified form of the thermodynamic theory of grinding, the quantities determining the input of kinetic energy were calculated on the basis of research on the grinding process in a jet mill. The modified thermodynamic grinding theory allows the influence of material defects on the actual value of the resistance to destruction of the ground material to be taken into account. Determining the total energy necessary for grinding by two components - volumetric and surface - allows the influence of both the internal structure of the substance and the external surface of the feed to be taken into account in the grinding process. The validity of this description is confirmed by experimental studies. |
DOI:10.12693/APhysPolA.139.529 topics: comminution, grinding energy, thermodynamic grinding theory, jet mill |