C - Chemistry – Metallurgy – 06 – B
Patent
C - Chemistry, Metallurgy
06
B
52/11
C06B 31/28 (2006.01) C06B 47/14 (2006.01)
Patent
CA 1087396
ABSTRACT OF THE DISCLOSURE The present invention relates to an aqueous blasting compo- sition having a continuous aqueous phase and comprising inorganic oxidizer salt, water, immiscible liquid hydrocarbon fuel finely and stably dispersed throughout the aqueous phase, thickener and, as the improvement, a crystal habit modifier to reduce the crystal size of the oxidizer salt and thereby increase the stability of the fine dispersion of the immiscible liquid fuel throughout the composition. The crystal habit modifier is preferably an anionic surfactant such as sodium methylnaphthalene sulfonate. The modifier is preferably used in amount from about 0.05% to about 3.0% by weight. Gassing and cross-linking agents are preferably employed. The present invention also relates to a method of sensitizing an aqueous blasting composition. The method comprises adding a crystal habit modifier to an aqueous blasting composition having a continuous aqueous phase and comprising oxidizer salt at least partially dis- solved in the aqueous phase; water; thickener and an immiscible liquid hydrocarbon fuel, such as No. 2 fuel oil, finely and stably dispersed throughout the aqueous phase. The modifier is added to the aqueous, salt-containing phase of the composition at a temperature above the crystallization temperature of the oxidizer salt in the phase. Thus, when precipitation of the salt occurs, it is controlled by the presence of the modifier.
283982
Borden Ladner Gervais Llp
Ireco Chemicals
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