Processing of energetic materials into propellants explosives or pyrotechnics can be both hazardous and waste producing. Formulations are generally high solid loading and can be very viscous or difficult to mix to homogeneity. The batches generally have limited pot life and for any number of reasons batches can exceed their pot life and generate significant waste. Even under optimum conditions batch mixing requires significant clean up after each run and generates large amounts of hazardous waste. In many processes, batches are made and distributed to the ordnance case. Continuous processes offer significant advantages and mix in case technologies are potentially a big improvement. SERDP and ESTCP have been exploring a variety of methods to improve on the formulation and processing of energetic materials.
Resonant acoustic mixing (RAM) technology was developed with the aid of a DOE grant from their Inventions and Innovation Program. Most conventional mixing requires impeller agitation. RAM induces microscale turbulence by propagating acoustic waves throughout the mix media. RAM devices are simple in design and can be made large enough to perform industrial scale processes. The use of RAM technology for EM formulation offers the ability to mix viscous high solids loaded formulations efficiently with minimal waste. SERDP and ESTCP have funded several projects to explore the utility of RAM for propellants, explosives and pyrotechnic formulations. In addition we are investigating mix in case and continuous processing as a means to further reduce hazardous waste. Learn More...
