Abstract
In the practice of mining works, sulfide-dust explosions often occur during underground development of pyrite ore deposits: copper-zinc, lead-zinc, copper-nickel, antimony, and others. This makes it necessary to conduct researches aimed at improvement of methods for studying the explosive properties of sulfide dust and development of industrial and environmental safety requirements for mining operations. Currently, there is no generally accepted state-approved regulatory procedure for assessment of sulfide dust explosion hazards during underground mining operations in Russia. Assessment of the type and concentration of mine sulfide dust in the underground mine atmosphere is vitally important for solving this problem. In practice, ores even with a sulfur content of less than 35% can constitute a sulfide dust explosion hazard, although mine dust with a sulfur content of less than 35% does not explode in laboratory conditions. To identify the cause of this phenomenon and develop technical solutions for ensuring safety of underground mining operations, change in the sulfur content of various mine dust fractions obtained from primary disintegration of sulfides was studied.
Highlights
The relevance of this research is justified by the role of pyrite ore deposits with non-ferrous and precious metals in the mineral resource balance of Russia
The graph shows that the smallest ore fractions obtained as a result of primary disintegration are characterized by high sulfur content
As follows from analysis of the results obtained during measurement of the sulfur content for various size classes after primary crushing of ores from the Sibayskoye, Sentachan and Shanuch deposits and sample examination by optical microscopy method, it was found that: 1. Increased sulfur content in small fractions of -40 microns is typical for ores characterized by a fine-grained, impregnated structure
Summary
It was established that over the past decade there has been a significant growth of dust generation in the underground conditions, caused by the increase in intensity of drilling and blasting works associated with depletion of the Russian mineral resources base [3] and transition to mining of the poorer sulfide ores. These changes led to the need for a comprehensive assessment of mineralogical and phase composition of sulfide dust with regard to the material composition and structure of ores and enclosing rocks. For an adequate assessment of the sulfide dust explosion hazard, studies expanding knowledge about the sulfide dust properties and allowing assessment of the sulfide dust explosive risks were carried out
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