R. Meyer J. Köhler A. Homburg Explosives

Large Hole Blasting
Large Hole Blasting
density: 0,8 g/cm 3
oxygen balance: –1,6%
gas volume: 981 l/kg
specific energy: 1001 kJ/kg
velocity of detonation: 3700 m/s
(steel tube confinement 52/60/1500 mm)
Großbohrloch-Sprengverfahren; sautage à grand trou
In large-scale blasting processes in open pit mining and quarrying,
rows of nearly vertical boreholes are drilled parallel to the quarry face;
the diameter of each borehole is 3–8 in. (in Germany more often
3– 4 in.), while the borehole length is over 12 m. The holes are filled
with explosive and stemmed. W Free-flowing Explosives or pumped
W Slurries can be applied.
Lead Acetylsalicylate
Bleiacetylsalicylat; acétylsalicylate de plomb
colorless, fine crystals
empirical formula: C18H14O8Pb·H2O
molecular weight: 583.5
energy of formation: –810 kcal/kg = –3391 kJ/kg
enthalpy of formation: –823 kcal/kg = –3444 kJ/kg
oxygen balance: –98.7%
Lead acetylsalicylate is a combustion-modifying additive, especially so
in W Double Base rocket propellants.
Lead Azide
Bleiazid; azoture de plomb
Pb(N3)2
colorless crystals; microcrystalline
granules, if dextrinated
molecular weight: 291.3
194