Improvement of the Thermocouple Method for Testing Energy-Intensive Emulsions for Compatibility with the Sulfide Ores



Annotation:

The results are presented concerning improving the thermostatic method for studying the chemical compatibility of modern industrial emulsion explosives based on the ammonium nitrate with surrounding materials, the increased reactivity of which can lead to spontaneous ignition and even explosion. An assessment of the compatibility of emulsion explosives with sulphide ores was conducted using an original thermocouple methodology developed at the D. Mendeleyev University of Chemical Technology of Russia, fixation of the thermal effects of the interaction of shell-free explosives based on the ammonium nitrate with sulfide minerals.

Improved thermocouple method allows to determine chemical compatibility of the industrial explosives with the reactive rocks. It is distinguished by the possibility of continuous recording of the thermocouple measurements during tests using an oscilloscope and combines the reliability of the results with small laboratory weights of the test samples (no more than 20 g, which ensures safety testing). Temperature measurement accuracy is ± 2 °С. It is concluded that the method used is able to identify the cases of the most dangerous interaction from the practice point of view using the emulsion explosives when the pyrite content in the ore exceeds 85 %.

The results of experiments on the applicability of thermocouple measurements to testing low-activity rocks, highly reactive pyrite ores, mixed sulfide ores of medium activity, as well as on the identification of the main regularities of heat release during the interaction of emulsion explosives with the sulfide ores are considered.

References:
1. Iljuhin V.S., Sosnin V.A., Strahov A.G., Filinov A.I. The possibility for emulsion explosives application in sulfide rocks and ores. Vzryvnoe delo = Explosion technology. 2009. № 101/58. pp. 100–109. (In Russ.).
2. Guidelines for the prevention of spontaneous ignitions and explosions of explosives based on ammonium nitrate during blasting operations in the copper-pyrite ores. Ekaterinburg: Unipromed, 1991. 7 p. (In Russ.).
3. Gunawan R., Freij S., Zhang D., Beach F., Littlefair M. A mechanistic study into the reactions of ammonium nitrate with pyrite. Chemical Engineering Science. 2006. Vol. 61. Iss. 17. pp. 5781–5790.
4. Nakamura H., Iwasaki M., Sato S., Hara Y. The reaction of ammonium nitrate with pyrite. Journal of Hazardous Materials. 1994. Vol. 36. Iss. 3. pp. 293–303.
5. Kovalenko I.L., Kuprin V.P., Savchenko N.V. Principles of emulsion explosives design for sulfide rocks safe breaking. Proceedings of 7th World Conference on Explosives and Blasting. Moscow, 2013. pp. 207–211.
6. The Method of testing the thermal stability of industrial explosives based on the ammonium nitrate in contact with the sulfide ore (Appendix B). Moscow: NPO «Kristall», 2002. pp. 26–28. (In Russ.).
7. Code of Practice Elevated Temperature and Reactive Ground. Ed. 4. Australian Explosives Industry and Safety Group Inc., 2017. 59 p.
8. Pupkov V.V., Maslov I.Yu., Bachurin L.V., Lebedev S.M., Kotyashov V.S., Perepelitsyn A.I., Gavrilov N.I. Assessment of chemical compatibility of industrial explosives with the rocks under development. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2004. № 4. pp. 37–40. (In Russ.).
9. European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR). Available at: http://docs.cntd.ru/document/58804886 (accessed: November 15, 2021). (In Russ.).
10. TR TS 028/2012. Technical Regulations of the Customs union «On safety of the explosives and products based on them». Available at: http://docs.cntd.ru/document/902359424 (accessed: November 15, 2021). (In Russ.).
11. Rubcov Ju.I., Kazakov A.I., Andrienko L.P. Macrokinetic patterns of heat release during thermal decomposition of the ammonium nitrate. Materialy 9-go Vsesojuznogo simpoziuma «Gorenie i Vzryvy» (Materials of the 9th All-Union symposium «Burning and Explosions»). Suzdal, 1989. pp. 86–90. (In Russ.).
12. Sosnin V.A., Gabdullin R.H. Investigation of thermal stability of the poremite emulsion. Fizika gorenija i vzryva = Combustion, Explosion and Shock Waves. 1994. № 6. pp. 89–96. (In Russ.).
13. Akinin N.I., Garmashov A.S., Miheev D.I. Ecotoxicity Assessment of the Industrial Explosives Explosion Products. Bezopasnost' truda v promyshlennosti = Occupational Safety in Industry. 2021. № 2. pp. 36–40. (In Russ.). DOI: 10.24000/0409-2961-2021-2-36-40
DOI: 10.24000/0409-2961-2021-11-58-63
Year: 2021
Issue num: November
Keywords : drilling and blasting operations explosives sulfide ores ammonium nitrate thermocouple method chemical compatibility self-heating
Authors:
  • Akinin N.I.
    Dr. Sci. (Eng.), Prof., Head of the Department Mendeleev University of Chemical Technology, Moscow, Russia
  • Garmashov A.S.
    Candidate, garmashov@muctr.ru D. Mendeleev University of Chemical Technology, Moscow, Russia
  • Rudomazin V.V.
    Deputy Head Federal State Autonomous Institution «Environmental Industrial Policy Center», Mytishchi, Russia