NON-DETONATING CHARGES IN POLYMER HOUSINGS FOR SMOOTH SPLITTING OF ROCK BLOCKS DURING PRIMARY EXTRACTION AND SECONDARY CUTTING

SEPRM - Volume 1

Nadezhda Stoycheva, Petar Shishkov

ABSTRACT. In some cases, during the extraction of certain mineral resources, industrial explosives are not sufficiently safe for the environment in terms of generated shock waves, toxic gases, seismic waves, scattering and vibrations. The main reasons for these harmful effects of the explosion are the speed and the mechanism of the chemical reaction of explosive decomposition. The authors have focused their research on a variety of fast–combusting high–energetic compositions, that can fully replace the widely used detonating explosives in the extraction and secondary processing (cutting) of large stone blocks. Samples from polymer containers filled with non–detonating compositions, based on waste gunpowder and metal–containing pyrotechnic mixtures were subjected to field tests. The experiments were performed in real conditions on stone blo cks with hardness f = 16 according to the Protodyakonov rock strength scale. Depending on the lengths of the blast holes, different charge designs were used.

Keywords: non–detonating blasting cartridges, propellants, smooth blasting, ornamental stone extraction

Stoycheva, N., P. Shishkov. Non-detonating charges in polymer housings for smooth splitting of rock blocks during primary extraction and secondary cutting
DOI: 10.5281/zenodo.4270146
DOI: https://doi.org/10.58903/a14161835

References

1. Boychev Y., Asenov S., 2018. “Pirotehnicheski sastavi za neletalni svetlinnozvukovi sredstva”, ISBN:978-619-7246-20-9, ISSN:2367-7481, 614-620, National Academic Publishing House (in Bulgarian) 

2. Boychev Y., 2018. “Pirotehnicheski neletalni sredstva za zashtita”, National conference with international attendance “Defence Industry – Leader of the Innovations in Bulgaria”, 20.09.2018, Sofia, Bulgaria  (in Bulgarian)

3. Mitkov, V. 2007. Za bezopasnostta na eksplozivite za gragdanski celi.– Annual of the University of Mining and Geology “St. Ivan Rilski”, 50, Part 2, 109−114 (in Bulgarian).  ISSN 1312-1820 

4. Mitkov, V. 2011. Razrabotvane i izsledvane na novi zariadi ot utilizirani boepripasi, Geology and mineral resourses Nr. 4, p. 30-33, ISSN 1310-2265 (in Bulgarian).

5. Mitkov V., 2010. Bezopasnost pri proizvodstvoto i upotrebata na eksplozivi,  ISBN 978-954-353-131-8 (in Bulgarian)

6. Mitkov V., 2010. Development of a new brand of coarse dispersed explosive based on technical ammonium nitrate. Fúrás- robbantástechnika  Nemzetközi Konferencia Balatonkenese 2010, Szeptember 8-10., pp. 65-70, HU ISSN 1788-5671. 

7. Mitkov V., Totev L., 2012.  Development of a new brand of coarse dispersed explosive based on technical ammonium nitrate Conference proceedings from the International conference of Blasting techniques, Stara Lesna, Slovak Republic, p. 135-141, ISBN 978-80-970265-4-7.

8. Shishkov P., Stoycheva N., 2018. Savremenni vzrivni tehniki za dobiv na skalno-oblicovachni materiali  – Mining and geology magazine, 10-11, p.42-49, ISSN 0861-5713 (in Bulgarian with English abstract) 

9. Stoyanov D.,1994. Rakovodstvo za uprazhneniya po probivno-vzrivni raboti v otkriti rudnici, karieri i stroitelstvoto”, MGU, Sofia (in Bulgarian)

10. Stoycheva N., Shishkov P., 2019. Innovative formulations for a new generation of low-speed explosive compositions, designed for blasting in tender conditions and for extraction of rock-cladding materials  – Journal of Mining and Geological Sciences, p.94 – 99, vol.62, Nr.2