Analysis of the factors that affect in the explosibility of coal dust in underground mines

Abstract

In order to establish which factors concern with coal dust explosibility  in the underground mines samples of coal dust of different mines in Antioquia, Boyaca y Norte de Santander and of lithotypes associations of several coal seams of mine from Antioquia were collected. Samples were under explosibility test, proximate analysis, sizing, petrographic, ignition point, and index of grinding hardgrove (IGH) to the coal seams samples.  The results indicate that the majority of coal dust present in the mines is explosive and for this reason it requires  of  inertization  in  percentages  greater  than  60%,  with  limestone  (principally).    It  was  determined that petrographic composition plays a roll preponderant roll in explosibility, i.e., the plies richest in liptinitic components  have major explosibility than those rich in vitrinites.  The coals with plastic proprieties, due they have free hydrocarbons and produce normally dust very thin, present high indexes of explosibility.