On the Risk of Area Occurrence with Reduced Oxygen in the Underground Mines when Developing Sulphide Ores


Annotation:

At the underground development of the sulfide deposits by the systems with a consolidating stowing, the temperature of the ore mass and the mine atmosphere increases due to the heat released during the hydration reaction of the hardening mixtures. This facilitates the activation of the oxidizing processes occurring in the sulfide ores. As a result, the areas with a reduced oxygen content are formed in the extended upstream workings. A decrease of the oxygen content in the working atmosphere below the critical values is a source of mortal danger for the underground mine personnel.

These assumptions were confirmed when analyzing the causes of the emergency at the Taimyrsky mine of PJSC «MMC «Norilsk Nickel». The production here is carried out with the application of slicing and chamber mining systems with the filling of the mined-out space by the consolidating stowing. Main ore minerals: pyrrhotite, chalcopyrite, cubanite, talnakhite and pentlandite, which chemical activity testifies to their potential fire hazard. Solid (rich) sulfide copper-nickel ores are prone in the fragmentary and crushed state to oxidation by air oxygen accompanied by the formation of heat. More intensive oxidation occurs in the presence of moisture and air flow through the crushed ore.

The calculations showed that the high air temperature, along with the presence of wet ore dust and fines in the dead-end mine where the accident occurred, contributed to the occurrence of critical deoxygenation of the atmosphere, which was the objective cause of the incident. In order to avoid the recurrence of this situation, it is required to control the oxygen content in the dead-end mine workings located near the filling mass. In addition, accidental penetration of people into these workings should be completely excluded.

References:
  1. Safety rules for conducting mining work and processing of solid minerals: Federal rules and regulations in the field of industrial safety. Ser. 03. Iss. 78. Moscow: ZAO NTTs PB, 2020. 302 p. (In Russ.).
  2. Kravchenko V.T. Development and implementation of the technology of consolidating stowing in the development of extensive low-falling deposits of high-value ores in the Far North conditions: thesis... Doctor of Technical Sciences. Moscow: IPKON, 1998. 71 p. (In Russ.).
  3. R & D report Assessment of the tendency of ores and host rocks to spontaneous combustion and explosion under operating conditions at the depths of more than 1500 m. Novosibirsk–Norilsk, 2017. 236 p. (In Russ.).
  4. Jung S. Sulphide self-heating: moisture content and sulphur formation. Montreal: McGill University, 2012. 104 p. 
  5. Rosenblum F. The key role of sample weathering in self-heating testing methodologies for sulphides. Review of self-heating testing methodologies. Proceedings of the XXVII International Mineral Processing Congress. Santiago, 2014.
  6. Ngabe B., Finch J.A. Self-heating activation energy and specific heat capacity of sulphide mixtures at low temperature. Minerals Engineering. 2014. Vol. 55. pp. 154–161. DOI: 10.1016/j.mineng.2013.09.016
  7. Somot S., Finch J.A. Possible role of hydrogen sulphide gas in self-heating of pyrrhotite-rich materials. Minerals Engineering. 2010. Vol. 23. Iss. 2. pp. 104–110. DOI: 10.1016/j.mineng.2009.10.011
  8. Schaufuss A.G., Nesbitt H.W., Scaini M.J., Hoechst H., Bancroft M.G., Szargan R. Reactivity of surface chemical states on fractured arsenopyrite (FeAsS) toward oxygen. American Mineralogist. 2000. Vol. 85. № 11–12. pp. 1754–1766. DOI: 10.2138/am-2000-11-1219
  9. Rosso K.M., Vaughan D.J. Sulphide mineral surfaces. Reviews in Mineralogy and Geochemistry. Vol. 61. Sulfide Mineralogy and Geochemistry. Berlin: De Gruyter, 2006. pp. 505–556. DOI: 10.1515/9781501509490-010
  10. Rosso K.M., Vaughan D.J. Reactivity of Sulfide Mineral Surfaces. Reviews in Mineralogy and Geochemistry. Vol. 61. Sulfide Mineralogy and Geochemistry. Berlin: De Gruyter, 2006. pp. 557–608. DOI: 10.1515/9781501509490-011
  11. Chiriţă P., Rimstidt J.D. Pyrrhotite dissolution in acidic media. Applied Geochemistry. 2014. Vol. 41. pp. 1–10. DOI: 10.1016/j.apgeochem.2013.11.013
  12. Naya T., Kohga M. Influence of Fe2O3 Size on Burning Characteristics of Ammonium Nitrate/Fe2O3 Propellants. Journal of Propulsion and Power. 2014. Vol. 30. Iss. 3. pp. 864–867. DOI: 10.2514/1.B35153
  13. Lara R.H., Monroy M.G., Mallet M., Dossot M., González M.A., Cruz R. An experimental study of iron sulfides weathering under simulated calcareous soil conditions. Environmental Earth Sciences. 2015. Vol. 73. pp. 1849–1869. DOI: 10.1007/s12665-014-3540-y
  14. Jun D., Xiaofeng M., Yutao Z., Yaqing L., Wenwen Z. Effects of pyrite on the spontaneous combustion of coal. International Journal of Coal Science & Technology. 2015. Vol. 2. Iss. 4. pp. 306–311. DOI: 10.1007/s40789-015-0085-y
  15. Payant R., Rosenblum F., Nesset J.E., Finch J.A. The self-heating of sulfides: Galvanic effect. Minerals Engineering. 2012. Vol. 26. pp. 57–63. DOI: 10.1016/j.mineng.2011.10.019
  16. Skochinskiy A.A., Komarov V.B. Mine ventilation. 2-e izd. Moscow–Leningrad: Ugletekhizdat, 1951. 564 p. (In Russ.).
  17. Markovich T.I. Kinetics of pyrrhotite leaching with sulphuric acid solutions under oxidative conditions with the participation of nitrous acid. Khimiya v interesakh ustoychivogo razvitiya = Chemistry for Sustainable Development. 2005. Vol. 13. № 4. pp. 541–550. (In Russ.).
  18. Sobolev A.E. Kinetics of pyrite and sphalerite dissolution in the presence of oxidants: thesis... Candidate of Сhemical Sciences. Tver, 2004. 280 p. (In Russ.).
  19. Gorinov S.A., Maslov I.Yu. Physical and mathematical model of heating of sulfide-bearing inclusions in ammonium nitrate explosives. Gornyy informatsionno-analiticheskiy byulleten = Mining Information and Analytical Bulletin. 2017. № S33. pp. 3–12. (In Russ.). DOI: 10.25018/0236-1493-2017-12-33-3-12
  20. Adamov E.V., Abdurakhmanov E. Collection of lectures on the course: Biotechnological processes in metallurgy. Navoi: NGGI, 2011. 142 p. (In Russ.).
  21. Sokolova G.A., Karavayko G.I. Physiology and geochemical activity of thion bacteria. Moscow: Nauka, 1964. 333 p. (In Russ).
DOI: 10.24000/0409-2961-2021-1-21-26
Year: 2021
Issue num: January
Keywords : sulfide ores underground working mining systems with a h consolidating stowing oxidation processes oxidation rate deoxygenation of the atmosphere
Authors:
  • Gorinov S.A.
    Gorinov S.A.
    Dr. Sci. (Eng.), Scientific Consultant, akaz2006@yandex.ru Global Mining Explosion — Russia LLC, Naro-Fominsk, Russia
  • Maslov I.Yu.
    Maslov I.Yu.
    Cand. Sci. (Eng.), Chief Engineer Global Mining Explosion — Russia LLC, Naro-Fominsk, Russia
  • Filatov A.P.
    Filatov A.P.
    Cand. Sci. (Eng.), Department Head Rostechnadzor, Moscow, Russia