Operational lifetime increase of the pumping equipment when pumping-out contaminated groundwater

Mykola Biloshytskyi,Nataliia Biloshytska,Pavlo Uvarov,Halyna Tatarchenko

doi:10.33271/mining15.01.042

Mykola Biloshytskyi, Nataliia Biloshytska + Show 2 more

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https://doi.org/10.33271/mining15.01.042

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Abstract

Purpose. Solving the problem of increasing the pumping equipment operational lifetime when pumping-out contaminated groundwater in the iron-ore industry by extracting the hard, abrasive part, using magnetic filters based on permanent ferrite magnets. Methods. To produce spherical hard-magnetic ferrite elements that catch finely-dispersed magnetic and weakly-magnetic abrasive particles when pumping-out contaminated groundwater in the iron-ore industry, barium ferrite powder BaО∙6Fe2O3 is applied, which is usually used for obtaining hard-magnetic ferrites. Spherical elements for filling a magnetic filtering installation are obtained by the method of spheroidizing the barium ferrite powder in a dragee machine. Sintering of spherical granules obtained from barium ferrite powder is conducted in a high-temperature atmospheric electric box furnace. The sintered spherical elements made of hard-magnetic barium ferrite are magnetized using a magnetic pulsed toroidal-shaped setup in a pulsed constant magnetic field. Findings. For continuous pumping-out and purification of contaminated groundwater from magnetic, weakly-magnetic and non-magnetic highly abrasive particles with the help of magnetic filters, a scheme of a filtering installation of two sections is pro-posed. A technology for producing spherical permanent magnets from barium ferrite powder has been developed for a filtering installation, which includes a coarse purification column with hollow-spherical permanent magnets of 16-17 mm in diameter and a fine purification column with full-bodied spherical barium ferrite magnets of 6-7 mm in diameter. Originality.The term of pumping equipment operation is doubled if to eliminate abrasive wear due to the filtering two-section installation by filling with barium ferrite spherical magnets. In the case of changing the filter, idle time is reduced by using the supplementary auxiliary column. The possibility of processing filtration products and their use in the field of construction and metallurgy without environmental pollution is substantiated. Practical implications. The scheme of magnetic groundwater purification in the iron-ore industry is proposed, consisting of a filtering column of coarse and fine purification from abrasive particles. A technology for producing spherical magnets with different diameters has been developed to ensure the quality of the process. The research results allow to increase the operational lifetime of pumping equipment by eliminating abrasive wear, which will lead to significant savings in the replacement and repair of centrifugal pumps. Keywords: pumping equipment, groundwater, wear, barium ferrite, spherical magnet, filter, iron-ore industry

Highlights

Development and improvement of technologies aimed at increasing the operational lifetime of the equipment for pumping-out underground water in the iron-ore industry is very acute and pressing production problem [1]-[3], since the removal of groundwater, formed inevitably both from open pits and underground mines of the mining industry, is accompanied by wear of centrifugal power pumps, suction and transporting pipelines, as well shut-off devices
The work is aimed at solving the problem of increasing the operational lifetime of pumping equipment when pumping-out contaminated groundwater in the iron-ore industry by extracting a hard, abrasive part using magnetic filters based on permanent ferrite magnets
Spherical permanent magnets made of barium ferrite, as the most widely used and relatively inexpensive material, are proposed to use as the column filler

Summary

Introduction

Development and improvement of technologies aimed at increasing the operational lifetime of the equipment for pumping-out underground water in the iron-ore industry is very acute and pressing production problem [1]-[3], since the removal of groundwater, formed inevitably both from open pits and underground mines of the mining industry, is accompanied by wear of centrifugal power pumps, suction and transporting pipelines, as well shut-off devices. When exploiting the pumping equipment, abrasive wear mainly occurs, since during the iron ore extraction, insoluble magnetic and weakly-magnetic hard particles are present in the groundwater in a suspended state, which, passing through the system, inevitably penetrate into the gaps of the moving pump surfaces [4]. This leads to a decrease in productivity, the operational lifetime of the parts in their flow channel, to significant operating costs and an increase in the cost of the final mining industry product [5], [6].

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