摘要:
A process for the production of explosives grade ammonium nitrate prill (EGAN) comprises the steps of
(A). producing seed ammonium nitrate prill as substantially monosized prills; and then (B). fattening using melt/solution of ammonium or mixed nitrates, with drying and thermal treatments, the seed prill in an inclined rotating jacketed pan granulator or a cascade of such pans to produce a final fattened EGAN prill product preferably having at most about 4 mm diameter.
摘要:
A method for producing an emulsion explosive comprises introducing a liquid organic fuel phase and an immiscible liquid oxidiser phase into apparatus having a mixer chamber (5), flow constrictor means (8) for introducing the liquid oxidiser phase as an emergent turbulent jet into the chamber to cause its fragmentation into droplets in situ within the chamber, means (10) for introducing the fuel phase into the chamber (5) so that the fuel phase introduced thereby contacts and becomes distributed around the droplets of oxidiser phase as they form to produce emulsion and further providing shear mixing means (12) within the mixing chamber (5) to effect enhancement of the mixing of the chamber contents and thereby to continuously incorporate the fuel phase to produce a more refined emulsion suitable for use as the basis for an explosive system, particularly emulsions of high velocity.
摘要:
Apparatus for producing a multi-phase emulsion explosive from a liquid organic fuel medium and an immiscible liquid oxidiser comprises a mixing chamber 5, flow constrictor means 8.9 for introducing the liquid oxidiser as an emergent turbulent jet to said chamber and causing formation of droplets of said oxidiser in situ within the chamber, means 10 for introducing the fuel medium to said chamber so that the fuel introduced thereby contacts and stabilises the droplets of oxidiser solution as they are formed to maintain same as discrete droplets of oxidiser liquid and thereby provide an emulsion suitable for use as the basis for an explosive system.
摘要:
Precipitation of fine azide core particles with in-situ coating with suspended tiny oxide particles, followed by concentration of the dilute suspension of these bodies to form a slurry with residual dissolved azide in the liquor, and finally converting the slurry in to solid aggregates of the pyrotechnic bodies by e.g. prilling whereby liquid phase evaporation releases dissolved azide causing the pyrotechnic bodies to be adhered together in to larger aggregates.
摘要:
Precipitation of fine azide core particles with in-situ coating with suspended tiny oxide particles, followed by concentration of the dilute suspension of these bodies to form a slurry with residual dissolved azide in the liquor, and finally converting the slurry in to solid aggregates of the pyrotechnic bodies by e.g. prilling whereby liquid phase evaporation releases dissolved azide causing the pyrotechnic bodies to be adhered together in to larger aggregates.
摘要:
Explosive grade ammonium nitrate (EGAN) prills are made by a process that comprises the steps of:
a. continuously spraying a 95 to 98% by weight solution/melt of ammonium nitrate (or a mixture of ammonium nitrate and minor proportions of one or more other EGAN - acceptable nitrates) in/with water under spray-head conditions causing the emergent jets to break into cascades of substantially mono-sized droplets; b. allowing the formed droplets to fall within a vertical duct; c. continuously feeding a stream of cooling gas upwards through the duct to effect cooling and solidification of the falling droplets and some removal of moisture so as to form substantially mono-sized EGAN prills of up to about 4 mm diameter, and d. continuously withdrawing the EGAN prills collecting at the base of the duct (such EGAN prills then optionally being further cooled and/or dried in a forced draught regime), the process being further characterised by intensification of the upward gas flow regime in the duct such that:
(i) the temperature difference of the gas flow between its inlet to the duct and its outlet from the duct is at least about 60°C; and (ii) the falling velocity of the prills in the duct is at most about 3 metres/second relative to ground (i.e. a stationary observer external to the duct) the upward gas flow velocity being e.g. 6 m/s relative to ground for 2 mm prill and 9 m/s for 3 mm prill and, optionally, (iii) recycling the gas stream after washing and cooling and addition of any required make-up gas.