Bagazeev V. K., Boikov I. S., Valiev N. G., Zdorovets I. L. Heavy minerals secondary processing estimation at pulp hydrotransport in the pipeline. Izvestiya vysshikh uchebnykh zavedenii.  Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 7: 25–33 (In Russ.). DOI: 10.21440/0536-1028-2019-7-25-33

Introduction. When developing placers containing small amounts of heavy minerals, it is advisable to use the technology of hydraulic mining which includes secondary processing of these minerals essential for sand preliminary processing.
Research aim is to estimate heavy minerals secondary processing in pipeline bottom layer and single this layer out of the general fow at pulp hydrotransport when developing placers with dredgers.
Methodology. Based on the regularities analysis of pulp hydrotransport, sands granulometric distribution and the results of physical simulation of the process in laboratory conditions, the analytical substantiation of hard minerals secondary processing parameters is carried out. The main provisions of secondary concentration are as follows: at sand hydrotransport, bottom layer of large and heavy particles arises in the pipeline, the particles drag or roll over. At that, particles distribution by size and density in the cross section of pulp fow corresponds to Rozin-Rammler equation.
Results. The results are presented of the laboratory research of weighing heavy particles from the bottom sediment, measuring weighing speed for heavy minerals and quartz sand. The obtained results were approximated by the formula. The example is given of heavy minerals secondary processing possibility analytical estimation.
Summary. The use of the secondary processing without change of a feld development process fow diagram will signifcantly improve the efciency of the subsequent processing processes when developing placer deposits.

Key words: dredger; hydrotransport; sedimentation; secondary processing of heavy minerals.

REFERENCES

1. Sogin A. V., Sogin I. A., Bitiurin K. A. Hydraulic mining at the inwash of construction sites, soil structures, and beaches. Nizhny Novgorod: NNSU Publishing; 2013. (In Russ.)
2. Petropavlovskaia V. E., Novichenkova T. B., Belov V. V., Buriakov A. F. Granulometric composition as a criterion of dispersed systems properties regulation. Stroitelnye materialy = Constructional Materials; 2013: 64–65. (In Russ.)
3. Semenenko E. V., Nikiforova N. A., Tatarko L. G. Hydrotransport parameters calculation at signifcant diference of the transported particles density. Visnik Dnipropetrovskogo universitetu. Seriia Mekhanika = Herald of Dnepropetrovsk National University. Mechanics. 2013; 1 (17): 105–111. (In Russ.)
4. Digitemie I. E., Ioppa A. V. Mini suction dredger for sand. In: The fourteenth International Scientifc and Practical Conference of Students, Postgraduates and Young Scientists “Modern Techniques and Technologies” (MTT’2008), Tomsk, Tomsk Polytechnic University. Tomsk: TPU Press Publishing; 2008. p. 56–58.
5. Ialtanets I. M. Hydraulic mining reference. Moscow: Gornaia kniga Publishing; 2011. (In Russ.)
6. Glevitskii V. I. Hydraulic mining at transport construction: handbook. Moscow: Nedra Publishing; 1989. (In Russ.)
7. Bessonov E. A. Technology and hydraulic mining technology at hydromechanized operations. Moscow: Tsentr Publishing; 1999. (In Russ.)
8. Filippov V. V. Process pipelines and pipeline fttings. Samara: SSTU Publishing; 2007. (In Russ.)
9. Zhurin V. D., Iufn A. P. Equipment for hydraulic mining. Moscow: Gosstroiizdat Publishing; 1960. (In Russ.)
10. Zvereva N. A., Valtsifer V. A. Internal structure of a powder during of its compacting. In: 14 International Congress of Chemical and Process Engineering CHISA. Praha (Czech Republic);
2000. Р. 63.
11. Pilov P. I. Mineral gravity separation. Dnepropetrovsk: NSU Publishing; 2010. (In Russ.)
12. Valiev N. G. Calculation of gold particles distribution by size at the slope of the inwash mass. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2002; 6: 15–18. (In Russ.)
13. Bagazeev V. K., Valiev N. G. Hydraulic mining: developing sand and gravel deposits by dredgers. Ekaterinburg: UrSMU Publishing; 2006. (In Russ.)
14. Idelchik I. E. Hydraulic resistance reference. Moscow: Mashinostroenie Publishing; 1992. (In Russ.)
15. Kutishchev A. V. Particle size structure of the cretaceous sand sediment section of the eastern section of Central deposit of Tambov region. Vestnik VGU. Ser. Geologiia = Proceedings of VSU. Geology. 2013; 2: 35–39. (In Russ.)

Received 2 July 2019