Ternova K. An acoustic monitoring justification of grinding material dispersion

The thesis is devoted to the acoustic monitoring justification of grinding material dispersion on the basis of connection of the process technological and acoustic parameters. Having examined the existing methods for analyzing the size composition and dispersity of materials, it was revealed that they have a number of drawbacks (the Justification of use of acoustic monitoring of dispersion of material when transporting in a gas-suspension stream is carried out. The analysis of the obtained results of acoustic signals and their characteristics made it possible to determine the characteristic frequencies for narrow fractions of various materials. Existing equations of kinetics and approaches to modeling the kinetics of grinding of bulk materials are considered. The kinetics of the size composition of the grinding product from mass-energy positions was studied. A modified form of the integro-differential equation of the kinetics of fine ore grinding is obtained. Simulation modeling of grinding process and dynamic modeling of shredding kinetics are carried out. A number of experimental studies of the grinding process of various materials have been carried out, which have made it possible to establish the regularity of the changes in the characteristics of acoustic signals recorded by grinding materials of different initial dispersity and products of different fineness. The characteristic frequencies for narrow fractions of materials are established. The experimental setups "Granulometer-1,2" were developed to analyze the size composition of materials in the stream. Regression analysis was performed to improve the design of the experimental setup, taking into account the influence of geometric parameters. The quality control system of the crushed product is developed, which includes visual observation of acoustic signals by the operator and an additional complex of analysis of acoustic signals to refine the monitoring results, which will accelerate the process of determining the fineness of the finished product through acoustic monitoring from 30 minutes to 1 minute. That will ensure the improvement of the ready product quality and the saving of electricity without re-processing of the product.