Experimental investigation and mathematical modelling of grinding talc in a jet mill
Résumé
The objective of the study is to generalize the experimental data on grinding talc in an opposed jet mill obtained earlier and to build a mathematical model of the process. The data on the rate of grinding were generalized on the basis of an exponential formula with gives the strong decrease of the rate with deviation of the hold-up from thr optimum one. The model of particle size distribution transformation in the mill, which in fact is the closed milling circuit with a rotor classifier, was built on the basis of the theory of Markov chains where the sample space was taken as two-dimensional: size fractions – elements of the circuit. After defining of parameters of the model, it was able to predict the existence of the minimum of ground material fineness with respect to the feed rate, which was found in experiments, and some other features of the process, which were not introduced into the model in advance.