St. Petersburg Mining University (St. Petersburg, Russia):

Alexandrov V. I., Head of Chair, Doctor of Engineering Sciences, Professor, victalex@mail.ru
Serzhan S. L., Associate Professor, Candidate of Engineering Sciences, sergei.serzhan@inbox.ru

«Mekhanobr Engineering» JSC (St. Petersburg, Russia):

Kibirev V. I., Deputy General Director, Candidate of Engineering Sciences, spb.kibirev@mail.ru

The hydrotransport system of Mikhailovsky GOK PJSC used for iron ore processing tailings was studied with the aim of establishing its performance in slurry pipelines with and without polyurethane coatings of their internal surfaces under mass concentration variations of 10 to 70 %, as well as for preparing related recommendations for the enterprise. Theoretical and laboratory studies were completed with the development of a methodology for recalculating the experimental laboratory data for the specific head loss in industrial pipelines. It has been established that the use of internal polyurethane coatings significantly reduces the specific head losses in hydraulic transportation of thickened tailings slurry for iron ore processing tailings. The respective feasibility calculations confirm the economic efficiency of using steel pipes with internal polyurethane coating in hydrotransport slurry pipelines. The calculated specific head losses for the pipelines with a polyurethane coating in the hydraulic transportation of processing tailings slurry with the mass concentration of the solid phase of 6.95 % are almost 1.8 times lower than in steel pipelines without such coating. It is proposed to use the results obtained in the reconstruction of the tailings slurry hydrotransport system at Mikhailovsky GOK PJSC with a conversion to hydraulic transportation of bulk concentration tailings thickened to 35–40 % in slurry pipelines with an internal polyurethane coating, which will ensure energy savings in the hydrotransport process.

1. Alexandrov V. I., Vasylieva M. A. The rheological properties of high concentration slurry at pipeline transportation on example of copper-nickel ore tailings. Miner’s Week – 2015. Reports of the XXIII International scientific symposium. 2015. pp. 452–460.
2. Chukhlonov V. Yu., Selivanov O. G., Selivanova N. V., Chukhlonova N. V. Development and research of a protective coating based on modified polyurethane. Fundamentalnye Issledovaniya. 2014. No. 6–7. pp. 1365–1368.
3. Antoev K. P., Popov S. N., Zarovnyaev B. N. A study of promising polymer lining materials resistance to hydroabrasive effects. Izvestiya Tulskogo Gosudarstvennogo Universiteta. Nauki o Zemle. 2019. No. 1. pp. 185–191.

4. Aleksandrov V. I., Avksentyev S. Yu. The Kolskaya Mine-and-Mill coppernickel ore processing tailings thickened slurry hydrotransport parameters study. Obogashchenie Rud. 2016. No. 2. pp. 40–43. DOI: 10.17580/or.2016.02.07.
5. Antoev K. P., Popov S. N. Investigation of resistance to hydroabrasive wear of GRP pipes with a polyurethane coating. Nauka i Obrazovanie. 2017. No. 1. pp. 87–90.
6. Góral D., Kyureghyan Kh., Kluza F., Kluza P. A. Method for determination of critical and effective diameter of pipeline insulation. Electronic Journal of Polish Agricultural Universities. 2014. Vol. 17, Iss. 3. URL: http://www.ejpau.media.pl/volume17/issue3/art-10.html.
7. Kumar U., Singh S. N., Seshadri V. Bi-modal slurry pressure drop characteristics at high concentration in straight horizontal pipes. International Journal of Engineering and Technical Research. 2015. Vol. 3, Iss. 4. pp. 394–397.
8. Parent L. L., Li D. Y. Wear of hydrotransport lines in Athabasca oil sands. Wear. 2013. Vol. 301, Iss. 1–2. pp. 477–482.
9. Sviridenok A. I., Myshkin N. K., Kovaliova I. N. Latest developments in tribology in the Journal Friction and Wear. Journal of Friction and Wear. 2015. Vol. 36, No. 6. pp. 459–453.
10. Westling V., Reiter R., Müller T. Hydroabrasive wear of high carbide infiltration materials. IOP Conference Series: Material Science and Enginiring. 2019. Vol. 480. DOI: 10.1088/1757-899X/480/1/012030.
11. Xu B. F., Lin Zh. D., Chen J. M., Lin J. Preparation and characterization of wear-resistant polyurethan-based materials. Applied Mechanics and Materials. 2014. Vol. 556–562. pp. 343–346.
12. Yagi T., Okude T., Miyazaki S., Koreishi A. An analysis of the hydraulic transport of solids in horizontal pipelines. Report of the Port and Harbour Research Institute. 1972. Vol. 11, No. 3.