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Emulsion explosive sensitising

a technology of emulsion explosives and sensitisation, which is applied in the direction of explosives, non-explosive/non-thermal compositions, weapons, etc., can solve the problems of uncontrollable gassing rate, increased cost, and required modification of equipmen

Inactive Publication Date: 2014-04-03
AEL MINING SERVICES
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  • Abstract
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AI Technical Summary

Benefits of technology

The invention is a method of sensitizing an emulsion explosive through gassing. The method involves preparing an emulsion with a continuous phase, a discontinuous phase containing ammonium nitrate, and a surfactant. The pH of the continuous phase is maintained above 5. The emulsion is then mixed with active sodium hypochlorite. The resulting emulsion has a viscosity of 18,000 to 27,200 cP. The emulsion and gassing solution are used in a ratio of 96% to 2%. The technical effect of this invention is to improve the sensitivity and stability of emulsion explosive.

Problems solved by technology

The use of thiourea is undesirable for it is believed to be a human carcinogen and the use of acetic acid requires modified equipment which adds to cost.
However the rate of gassing is uncontrolled.

Method used

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  • Emulsion explosive sensitising
  • Emulsion explosive sensitising

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Embodiment Construction

[0024]One aspect of the invention is based on the realisation that the fuel phase composition of the emulsion determines the gassing rate and performance of the final product. The surfactant constitutes approximately 20% of the fuel phase and forms an integral part in a barrier between the oxidising solution and the gassing solution.

[0025]Basic head groups on the PIBSA (poly-isobutylene succinic anhydride) surfactant have been used successfully in providing additional stability to the emulsion when oxidiser quality is a problem. These surfactants however have drawbacks in that a sodium nitrite gassing system does not provide sensitisation under normal operating conditions. The independence of a sodium hypochlorite gassing system to pH provides a suitable alternative for sensitising an emulsion system without requiring fundamental changes to operating procedures or equipment.

[0026]In the present invention use is made of a surfactant composition that contains a different surfactant he...

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Abstract

An emulsion explosive, formulated with a basic surfactant, which is sensitised by gassing with active sodium hypochlorite.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates generally to sensitising an emulsion explosive by gassing and more particularly to controlling the rate at which sensitising takes place.[0002]The specification of PCT / AU2008 / 000013 contains a description of sensitising techniques for various types of explosives. In general terms the density of an explosive is reduced. In one technique this is achieved by forming small bubbles of nitrogen or another acceptable gas in situ in the explosive by means of a chemical reaction. One gassing method requires the addition of a substrate such as thiourea and acetic acid. The use of thiourea is undesirable for it is believed to be a human carcinogen and the use of acetic acid requires modified equipment which adds to cost.[0003]Hypochlorite gassing does not require thiourea nor acetic acid. However the rate of gassing is uncontrolled.[0004]An object of the present invention is to control the rate of gassing in a hypochlorite gassing system....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B31/28
CPCC06B31/28C06B23/004C06B47/145
Inventor PIENAAR, ANDREYAKHOUB, HAMATKENNEDY, ERICDLUGOGORSKI, BOGDAN
Owner AEL MINING SERVICES
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