Research of the options for improving the soil base for iron ore pulp
DOI:
https://doi.org/10.62911/ete.2023.01.01.09Keywords:
pump, pulp, lining, gum ball, flow part, impeller, bladeAbstract
For pumping iron ore slurry, many mining and processing plants in Ukraine use an 8Gr-8m submersible pump. As shown its performance under the conditions of pumping pulp with a density of up to 1400 kg/m 3, they do not correspond to the passport data, and this is mainly due to concerns the flow chamber, the service life of which is reduced by almost 2 times compared to the manufacturer’s suggested service life. Therefore, the aim of the work was to study options for improving the design of the flow part of the 8Gr-8m pump, which would significantly increase its service life. To achieve this goal and obtain the required results we chose a method based on hydrodynamic studies using CAD technologies, for which, in addition to the 3D model of the existing pump, four more different designs were developed. The proposed designs were studied using SOLIDWORKS Flow Simulation program, which allowed us to model the movement of the pulp in the pump flow chamber. The parameters for modeling were selected based on pump operation conditions at the iron ore pulp pumping section concentrator of the Southern Mining and Processing Plant in Kryvyi Rih. The analysis of the results showed that the best performance is provided by a composite impeller with 4 blades of complex shape, low profile, which has a good pumping characteristic with a minimum tendency to wear. The design of the removable impeller is made of cast steel and lined with rubber, it has 4 blades with rounded front edges. The distance along the armhole between the side washers is 50 mm, it is unchanged. The pressure surface of the blade has a short ledge. The distribution zone is a high layer of small diameter. The inlet washer is flat, but with a high flap on the diffuser. The diameter of the wheel is 520 mm, and its weight is 70 kg. Based on this model, animproved design was proposed for of the flowing part of the 8GR-8m pump impeller and its lining lining based on SCS-30ARKM-15 rubber, which in combination with technical solutions allows to more effectively prevent wear of the studied unit and leads to increase its service life.
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