Emulsion explosive composition and preparation method therefor

Abstract

The present invention relates to an emulsion composition for an explosive and to a method of preparing the same, wherein the emulsion composition includes, based on the total weight thereof, 85 to 95 wt % of an oxidizing agent aqueous solution, 0.3 to 5 wt % of an emulsifier, and 3 to 10 wt % of oil, the emulsifier including a PIBSA (polyisobutylene succinic anhydride) amine salt having an acid value of 30 or less and an amine value of 45 to 65, under a precondition that the oxidizing agent aqueous solution includes at least one of industrial ammonium nitrate, agricultural ammonium nitrate and low-specific-gravity ammonium nitrate for an ammonium nitrate fuel oil explosive, which is used without additional filtration or removal of impurities.

Description

TECHNICAL FIELD[0001]The present invention relates to an emulsion composition for an emulsion explosive, in which stability is ensured when granular ammonium nitrate including an organic or inorganic material is provided in the form of an oxidizing agent aqueous solution using water, without an additional filtration process, and to a method of preparing the same.BACKGROUND ART[0002]In bulk emulsion explosives, which are currently used as industrial explosives at mining sites for metals, coal, limestone and the like worldwide, including Korea, an ammonium-nitrate-based oxidizing agent has been utilized. Specifically, an emulsion explosive is produced by preparing a liquid oxidizing agent through the synthesis of nitric acid and ammonia in a plant for manufacturing a liquid oxidizing agent, which is separately constructed. When the liquid oxidizing agent thus synthesized is used, a pure ammonium nitrate oxidizing agent may be obtained, and the prepared emulsion is advantageous because...

AI Technical Summary

Benefits of technology

The present invention is about an emulsion composition for an emulsion explosive that is stable and cost-effective. The composition includes oxidizing agent aqueous solution and fuel solution. The use of ammonium nitrate with a solidification inhibitor and other organic or inorganic materials provides better stability and long-term storage compared to conventional emulsions. The use of cheap materials like agricultural ammonium nitrate and porous ammonium nitrate reduces material costs by about 12%. The emulsifier used in the composition has a specific amine value and acid value to further enhance the stability. The emulating composition can be used in emulsion explosive formulations.

Problems solved by technology

When the liquid oxidizing agent thus synthesized is used, a pure ammonium nitrate oxidizing agent may be obtained, and the prepared emulsion is advantageous because the stability thereof may be ensured for about 3 months or more, as required by the consumer, but investment costs are undesirably increased due to the need to construct a separate plant for producing a liquid oxidizing agent.

Therefore, in order to minimize the cost of constructing a plant for producing liquid ammonium nitrate, a method of purchasing and dissolving solid ammonium nitrate has been employed as an alternative, but is problematic because ammonium nitrate, having high purity, is solidified due to chemical properties that facilitate absorption of moisture during storage, and thus a crusher has to be additionally used.

However, in order to prepare an emulsion, in the case in which such ammonium nitrate is used in the form of an oxidizing agent aqueous solution by dissolving the same in water, the emulsion cannot be formed or the emulsion stability may deteriorate due to the solidification inhibitor and the additional organic or inorganic material.

With the goal of solving these problems, the emulsion is typically prepared using an oxidizing agent aqueous solution resulting from filtering and removing impurities other than the ammonium nitrate, but problems such as the cost of disposal of the removed impurities, the increased risk due to handling of materials at high temperatures, and lowered productivity due to additional processing may occur.

Meanwhile, Korean Patent Application Publication No. 10-2005-0074279 discloses a waterproof granular explosive composition (Laid-open date: Jul. 18, 2005), comprising porous ammonium nitrate, a nitro compound and the like, whereby the explosive composition is easy to handle, is easily manufactured, and has sufficient water resistance and explosion performance for a typical immersion time upon practical use, but is difficult to apply to an emulsion explosive composition.