Kradozhon S. Development of a mathematical model and selection parameters of a conveyor technological transport-dewatering system for the preparation of crushed iron ore beneficiation products

In the dissertation work, the actual scientific task is solved of increasing the efficiency of the drying process of finely dispersed materials by choosing rational parameters of the system. One of the possible ways to improve the drying process can be the use of a combined method of drying chopped enrichment products with internal heat sources. A mathematical model was developed that fully describes the process of drying finely dispersed materials under the influence of alternating electric current; obtained analytical dependences for determining the final humidity and temperature of the material. A laboratory setup was developed to study the process of drying finely dispersed materials under the direct influence of electric current. As a result of the conducted experiments, the adequacy of the mathematical model was confirmed, the influence of the structural and technological parameters of the system was established. On the basis of the obtained data, a laboratory installation was developed for dehydration of chopped enrichment products by a combined method. It has been proven that the greatest efficiency of squeezing out droplet moisture can be achieved when the electrodes are immersed by 60-65% in the material layer; it was found that the minimization of specific energy consumption with the combined method of dehydration is achieved at an alternating electric current intensity of 6.5⋅103 to 8.5⋅103 V/m. As a result of the conducted research, a plant for dehydration of chopped enrichment products with internal heat sources under electric heating conditions and a methodology for calculating the design parameters of the drying plant were developed; method of calculating the final moisture content of the material.