УДК 338.23:330.52(98)

DOI: 10.21440/0536-1028-2019-8-97-107

Download

Semenov A. N., Seryi R. S. Hard-to-wash sand disintegration investigation in gold placers. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 8: 88–96 (In Russ.). DOI: 10.21440/0536-1028-2019-8-88-96

Abstract Introduction. A promising area of replenishing the resource base for placer gold mining could be the involvement of high clay content deposits. Important scientifi c and practical problem with this solution is improving the quality of sand preparation for enrichment due to high-quality disintegration. Solving the problem requires not only creating more effi cient clay sands disintegrators, but also study of sand granulometry, evaluation of their physical and mechanical properties, the material composition of the mineral rock mass. The composition of the hard-to-wash sands of the Far East shows that the clay content in them varies widely and can reach 60% or more. Analysis of the existing methods of sands deposits disintegration shows that the use of traditional methods of rock preparation for enrichment will not allow to fully solving the problem of processing high-clay alluvial deposits.
Research aim is the development of a scheme for processing high-clay sands using a high-pressure hydrodynamic disintegrator based on the principle of the effect of hydrodynamic cavitation.
Research methodology. The experiments have been carried out on high-clay sand processing with a laboratory disintegration facility with various cavity activators.
Results. In the course of the study, the design of the device for the disintegration of high-clay sands was developed and proposed for practical implementation, allowing to reduce the loss of gold in the enrichment of high-clay sands on sluice washers, as well as to engage in mining alluvial deposits with high clay content, mining of which was previously considered unprofitable. The use of this technological scheme will make it possible to switch from a two-stage technology for the processing of placers to a one-stage, incorporating the processing of sands and effel into a single technological process, eliminating the costs of processing man-made alluvial sands of gold deposits.

Key words: placer gold deposit; high clay content sands; disintegration; cavitation; hydrodynamic disintegrator.

REFERENCES

1. Mirzekhanov G. S., Litvintsev V. S. Mining waste management at precious metal placers in the Russian Far East: State-of-the-art and problems. Gornyi zhurnal = Mining Journal. 2018; 10: 25–30. DOI: 10.17580/gzh.2018.10.04. (In Russ.)
2. Mirzekhanov G. S., Mirzekhanova Z. G. Resource potential of technogenic formations of gold placers. Moscow: MAKS Press Publishing; 2013. (In Russ.)
3. Litvintsev V. S., Sas P. P. Current state and main directions of innovative development of placer gold mining in Far East Federal District. In: E3S Web of Conferences. 2018; 56. DOI: 10.1051/ e3sconf/20185604004
4. Litvitsev V. S., Alexeev V. S., Kradenykh I. A. The technology of development of residue objects of precious metals placer deposits. In: E3S Web of Conferences. 2018; 56. DOI: 10.1051/e3sconf/20185601005
5. MacFarlane K. E., Nordling M. G. Yukon Exploration and Geology Overview 2013. Whitehorse, Canada (Yukon Geological Survey), 2014. 80 p.
6. Oberthuer T., Melcher F., Weiser T. W. Detrital platinum-group minerals and gold in placers of southeastern Samar Island, Philippines. Canadian Mineralogist. 2017; 55(3): 45–62.
7. Seryi R. S., Nechaev V. V. On the necessity of an integrated approach to the problem of disintegration of hard-to-wash sands of placers. Gornyi informatsionno-analiticheskii biulleten (nauchno-tekhnicheskii zhurnal) = Mining Informational and Analytical Bulletin (scientific and technical journal). 2009; special edition 4. Far East-1. pp. 268–274. (In Russ.)
8. Khnykin V. F. Prospects of hard-to-wash high-clay gold placers. Gornyi zhurnal = Mining Journal. 1995; 11: 26–31. (In Russ.)
9. Beloborodov V. I., Fedotov K. V., Romanenko A. A. Concentrating gold-bearing sand with a high content of clay. Gornyi zhurnal = Mining Journal. 1995; 5: 12–18. (In Russ.)
10. Kisliakov V. E., Karepanov A. V., Semenov A. N. Results of research of clay-bearing sand preparation to gravitational concentration. In: Gravitational methods of concentration. Modern concentration equipment and new technologies to process mineral raw material. Proceedings of the 2nd science and technical conference dedicated to the 100th anniversary of Trud plant. Novosibirsk: Sibprint Publishing; 2005. p. 87–89. (In Russ.)
11. Levkovskii Iu. L. The structure of cavitation flows. Leningrad: Sudostroenie Publishing; 1978. (In Russ.)
12. Kisliakov V. E., Karepanov A. V., Semenov A. N. Study of clay-bearing sand washing efficiency. In: Modern technologies of mineral resources development: collection of works. Krasnoyarsk: GATsMiZ Publishing; 2004. p. 354–362. (In Russ.)
13. Karepanov A. V., Semenov A. N. Study of clay softening with the use of hydrodynamical cavitation. In: Modern technologies of mineral resources development: collection of works. Krasnoyarsk: GATsMiZ Publishing; 2005. p. 190–194. (In Russ.)

Received 7 May 2019