Performance of a New Composite Explosive Used in Permissible Detonators for Coal Mining

A new type of composite explosive used in a permissible detonator for coal mining has been manufactured through a two-phase granulation process. The new composite explosive (NCE) contains 79–88 wt% RDX, 3–5 wt% polymer binder, 1.5–2.5 wt% insensitive agent, 6–14 wt% sodium aluminum silicate (SAS), and 1–2 wt% polyvinyl alcohol (PVA). Firstly, a water suspension granulation method was utilized to produce spherical explosive molding powder. Then, the molding powder was coated with a flame inhibitor by a spraying granulation technique. Comparatively, the molding powder provided in this work outperforms the powder manufactured from other processing in terms of fluidity, particle size distribution, flame inhibitor coating quality, and accumulation of static electricity as a result of the chemical composition and the unique granulation process. This study offers a new type of detonating explosive with improved safety and initiating ability for mining industries, and it may also provide a novel strategy for processing other types of energetic materials.