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

Aleksandrov V. I., Head of Chair, Doctor of Engineering Sciences, Professor, victalex@mail.ru

Mekhanobr Engineering JSC (St. Petersburg, Russia):
Kibirev V. I., Head of Depertment, Candidate of Engineering Sciences, spb.kibirev@mail.ru

The paper describes the Kachkanarsky Mining-and-Concentrating Complex iron ore processing tailings slurry hydraulic transport parameters determination with solid phase mass fraction from 30 to 70 % and presents the recommendations developed for commercial operation of highly-concentrated slurry hydraulic transport in the Kachkanarsky MCC tailings disposal system. The analytical methods included the laboratory studies of thickened tailings slurry hydraulic transport parameters with development of calculation methodology; pilot-scale testing of the Kachkanarsky MCC tailings hydraulic transport system. It was established, that with use of polyurethane coating on internal surface of hydrotransport pipelines, specific head losses are significantly reduced (by the factor of 1.75) in thickened tailings slurry hydraulic transport. This permits to considerably increase hydraulic transport distances in tailings disposal to distant areas of the tailings storage pond. The accomplished technical and economic calculations verified the economic efficiency of application of steel pipelines with internal polyurethane coating. The results of the work are proposed to be used in the Kachkanarsky MCC tailings disposal system hydraulic transport upgrade project, making provisions for change over to hydrotransport of thickened tailings slurry with solid phase mass fraction of 35–40 %, using pipelines with internal polyurethane coating, thus achieving energy saving in hydraulic transport process.

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