Chemical foaming of emulsion explosive compositions

Details Chemical foaming of emulsion explosive compositions Chemical foaming of emulsion explosive compositions

1989-02-02

1989-10-24

Miller, Edward A.

Explosive and thermic compositions or charges

Processes of making

149 2, 149 44, 149 60, 149 61, D03D 2300, C06B 4500

Patent

active

048759511

ABSTRACT:
This invention provides an improved method of foaming a water-in-oil emulsion explosive wherein a gassing agent which is a water-in-oil emulsion containing an aqueous solution of sodium nitrite in its discontinuous phase is mixed with the emulsion explosive. The sodium nitrite reacts with ammonium nitrate in the discontinuous phase of the emulsion explosive to generate small particles of gas which are distributed throughout the explosive. The method improves the gas bubble distribution and enhances the sensitivity of the explosive to blasting cap initiation.

REFERENCES:
patent: 4409044 (1983-10-01), Bhattacharyya et al.
patent: 4507161 (1985-03-01), Sujansky et al.
patent: 4594118 (1986-06-01), Curtin et al.
patent: 4711678 (1987-12-01), Ehrnstrom
patent: 4737207 (1988-04-01), Ehrnstrom et al.
patent: 4756776 (1988-07-01), Halliday et al.
patent: 4790890 (1988-12-01), Miller
patent: 4790891 (1988-12-01), Halliday et al.

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