NUMERICAL EXPERIMENTS FOR STUDYING THE KINETICS OF DECOMPOSITION OF MINERAL RAW MATERIALS WITH VIBRO-IMPACT SCREENING
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 113
Abstract
Purpose. The study of the kinetics of dehydration in vibroimpact screening on a mathematical model using numeri-cal experiments. Methodology. Synthetic of research results using computer simulation methods has been used. Find-ings. None of the theories of screening is universal or at least generally accepted. A number of important features of the process remain unexplored. These include: studying the effect of surface tension on the process of passing a liquid through the cells of the screening surface and a layer of mineral raw materials, taking into account its properties; the impact on the kinetics of vibratory screening changes in the moisture of the raw material in the process of screening (the mutual influence of the classification by size and dehydration). IGTM NAS of Ukraine created a mathematical model of dehydration, which describes its laws. At the same time, numerical experiments that did not confirm that the mathemat-ical model adequately describes the experimental data were not carried out. Originality. Mathematically described the process of removing fluid located in the capillary-docking bridges between the particles. This is achieved by simulating the transition of a fluid over the height of a layer by a discrete Markov process with discrete states. Geometrical and energy conditions are described mathematically, under which a fluid moves between particles. The mathematical model using numerical experiments studied the kinetics of the removal of capillary-butt water during vibro-impact screening for materials of narrow and wide size spectra with different modes of vibro-impact screening. It is established that the experimental and calculated data differ by no more than 15%, i.e. The mathematical model formulas with a confidence level of 0.95 adequately describe the experimental results. Practical value. The results obtained allow using the math-ematical model of dehydration to calculate and select rational parameters of the process of fluid removal. Conclusions. A method for determining the efficiency of dehydration during vibro-impact screening in enrichment technologies of technogenic deposits has been created, which allows calculating rational regime and technological parameters of the process of mineral dehydration during vibro-impact screening and increasing its efficiency, which will improve the quality of a commercial product and, as a result, the profits of mining and processing enterprises.
Authors and Affiliations
А. Shevchenko
Keywords
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- EP ID EP660739
- DOI 10.30929/1995-0519.2018.6.70-78
- Views 77
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