Monastyrskyi V.F., Monastyrskyi S.V., Mostovyi B.I. Effect of water medium upon the process of ore disintegration in wet self-grinding mills

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 146

Geoteh. meh. 2019, 146, 91-98

https://doi.org/10.1051/e3sconf/201910900058

EFFECT OF WATER MEDIUM UPON THE PROCESS OF ORE DISINTEGRATION IN WET SELF-GRINDING MILLS

¹Monastyrskyi V.F., ¹Monastyrskyi S.V., ¹Mostovyi B.I.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC 622.724: 622.76                                       

Language: English

Abstract.

This article presents the results of theoretical and experimental studies on the processes of destruction ore in wet self-grinding mills (WSGM). Depending on pH (hydrogen parameter) and Eh (oxidizing-restoration parameter) values, water medium is capable of penetrating into the lumps through cracks formed in the mother rock (germinal ones). Argillaceous and ochreous minerals being practically always available in mineralogical composition of the deposits of diamond-bearing raw material, form specific films on the mineral surfaces. When the lump and obstacles interact, surfaces are destructed, microcracks are closed at the expense of material elasticity, and a lump may be represented as a sphere inside of which there are minor cavities filled with the incompressible liquid. The equivalent circuit for determining the stress-strain state of a piece exposed to the load at an angle of repose of the material in motion are justified. In this case, a uniformly distributed pressure acts on the body of arbitrary shape, depending on the hydrostatic pressure of the pulp inside the drum and the force of hydrodynamic resistance). It is assumed that a piece has the shape of a sphere with a uniform structure, but in some of its parts there are cavities filled with an incompressible fluid. Under the action of forces inside the cavity wedging effects of water occur, the effect of which on the strength ores depends on the expansion force and the angle of the micro crack. The experimental researches are done under laboratory and industrial conditions. Effect of a wedging force upon the ore strength was determined experimentally under laboratory conditions using a plant for one-axial compression of samples from different ores and rocks; the plant was equipped with hydraulic press with 60 kN and computer for simultaneous recording of compression force and deformation. The research methodology stipulated that tests were carried out involving following samples: dry, previously wetted, solid, glued two-layer, and with a cavity. It was established that the disintegration of kimberlitic ore in WSGM is significantly influenced by the characteristics of the aquatic environment pH and Eh, the values of which vary from 3.2 to 7.0 and from -500 to +1020 mV.

Keywords: liquid, experiment, durability, equivalent circuit, hydrogen parameter, oxidizing-restoration parameter.

REFERENCES

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About the authors

Monastyrskyi Vitalii Fedorovych, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in the Department of Geomechanics of Mineral Opencast Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Monastyrskyi Serhii Vitaliiovych, Candidate of Technical Sciences (Ph. D), Junior Researcher in the Department of Geomechanics of Mineral Opencast Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Mostovyi Borys Ivanovych, Master of Science, Principal Specialist in the Department of Geomechanics of Mineral Opencast Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

 

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