Dissertation is devoted to solving actual scientific problem that consists in increasing the reliability and efficiency of slurry pump of mining and metallurgical complex by restoring and protecting its parts from the complex impact of the abrasive, cavitation and corrosion using a composite material based on polyurethane with the addition of corundum various factions. In the first section an analytical review of this scientific task was performed, which showed that today in the conditions of the blast-furnace shop of PJSC "Ilyich Iron and Steel Works" for the restoration of armor of shells of slurry pumps, which are used in the technology of semi-fine purification of blast furnace gas from dust, use insufficiently effective recovery method and materials that are not able to withstand the joint action of intense abrasive, hydroabrasive and cavitation wear. There are a large number of methods for protecting and restoring parts and units of metallurgical machines, each of which is designed for a separate type of wear, but in the case of a combination of several types of wear, such methods of protection may be ineffective. The analysis of literary and other types of information sources indicates that existing methods of protection and restoration of worn surfaces are not efficient enough and labor-intensive in combating complex wear and tear, and the materials used do not allow to solve the problem of protection in the conditions of joint action of abrasive, corrosion and cavitation wear.At the same time, these materials have a fairly high cost, which does not allow them to be used to cover a large area in pumps and other equipment. The second section is devoted to the analysis of operating conditions and failure of slurry pumps in the conditions of the gas works of PJSC "Ilyich Iron and Steel Works". The slurry pumps in the enterprise are used in the technology of semi-fine blast-furnace gas cleaning from dust, the amount of which varies depending on the degree of preparation of raw materials for smelting, the strength of coke and the equality of stroke. In the third section experimentally it was determined the mechanical characteristics of the composite material used to restore the pumping equipment.Based on experimental and theoretical research it was developed the optimal composition of composite material and was protected by the patent for a useful model, the technology of recovering elements of the pumping equipment, as well as new construction of the suction nozzle of a slurry pump, also was protected by the patent for useful model. It has been further developed using as armor protection hull slurry pump composite material based on polyurethane with inclusions of strengthening elements, thus improving resource pumping equipment. In the fourth section, mathematical and computer simulation of the loading process of the working surfaces of slurry pumps reconstructed with the help of a polymeric material is performed. In this paperit's performed a theoretical analysis of the wear process of slurry pumps' armor,a mathematical model of wear process from which improved the method of calculation of the intensity of wear composite material based on polyurethane. That allowed to obtain analytical dependence the stability armor hull of the duration of contact with the pumping environment considering experimentally found values of their mechanical characteristics, confirmed by physical modeling the process stress armor and allowed to change as housing construction and thickness of the protective coating. The first time it is proposed method for evaluating the reliability armor hull slurry pump, which takes into account the complex nature of the interaction pumping environment and the protective layer of coating that allows to predict the time of failure of slurry pump. The results as the analytical model of abrasion wear of composite armor and recovery technology of slurry pumps are introduced in the educational process ofSHEE "PSTU". The fifth section presents the results of industrial research and testing of the developed technology for the restoration of the armored layer of shells of slurry pumps and the design of their suction nozzles.The proposed technologies were tested in a variety conditions.In order to increase the wear resistance of the slurry pump body, it was proposed to improve the design of the suction pipe, namely, its lining to perform a conical shape with a smaller aperture on the side of the hydrosubstance input and longitudinal P-shaped projections on the part of the output portion of the pipe. Developed methods of recovering pumps are introduced in the gas plant ofPJSC "Ilyich Iron and Steel Works", which makes it possible to increase the reliability of reduced equipment to 53.6%. The same time developed technology has allowed putting into operation transfer pumps of South Ukraine Nuclear Power Plant. Keywords: abrasive wear, reliability, slurry pump, hull, composite material, recovery technology, intensity of wear, protective armor.
