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V. I. Efimov
V. I. Efimov

Articles

Geoecology and occupational health and safety
  • Date submitted
    2016-08-30
  • Date accepted
    2016-10-30
  • Date published
    2017-02-22

Gas-dynamic processes affecting coal mine radon hazard

Article preview

The paper focuses on vertical migration of radon in surrounding rocks described by Fick's first law as well as by the continuity equation for diffusion flow, with allowance for sorption and radioactive decay processes. Taking into account special characteristics of vertical radon diffusion, the process can be considered stable. It is demonstrated that for productive areas it is feasible to consider one-dimensional convective diffusion, as diffusive transport of radon by the air of productive areas occurs at steady-state conditions. Normally the factor of radon emissions prevails if atmospheric pressure is constant. Amount of air, calculated using this factor, by 20-30 % exceeds the one needed to dilute carbon dioxide to maximum allowed concentration (MAC).

How to cite: Efimov V.I., Zhabin A.B., Stas G.V. Gas-dynamic processes affecting coal mine radon hazard // Journal of Mining Institute. 2017. Vol. 223. p. 109-115. DOI: 10.18454/PMI.2017.1.109
Without section
  • Date submitted
    1996-06-22
  • Date accepted
    1996-07-04
  • Date published
    1997-09-30

Structure formation conditions of the Bazhenov chrysotile-asbestos deposit and regularities in the distribution of natural and industrial ore types

Article preview

The primary role of the fault zone in the formation and preservation of chrysotile-asbestos mineralization of the Bazhenov subtype, which can be attributed to deposits of near-fault metamorphism, has been established.

How to cite: Efimov V.I., Barabanov V.P. Structure formation conditions of the Bazhenov chrysotile-asbestos deposit and regularities in the distribution of natural and industrial ore types // Journal of Mining Institute. 1997. Vol. 143. p. 63-69.