EP0568387B1 - Low-density water-gel explosive composition, production and use thereof - Google Patents
Low-density water-gel explosive composition, production and use thereof Download PDFInfo
- Publication number
- EP0568387B1 EP0568387B1 EP93303408A EP93303408A EP0568387B1 EP 0568387 B1 EP0568387 B1 EP 0568387B1 EP 93303408 A EP93303408 A EP 93303408A EP 93303408 A EP93303408 A EP 93303408A EP 0568387 B1 EP0568387 B1 EP 0568387B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- composition
- density
- solution
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
- C06B23/002—Sensitisers or density reducing agents, foam stabilisers, crystal habit modifiers
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B47/00—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B47/00—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase
- C06B47/14—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase comprising a solid component and an aqueous phase
Definitions
- This invention relates to a low-density water-gel explosive composition, as well as to the production and use thereof.
- Such reducing agents include air bubbles, which may be entrained during mixing of ingredients, gas bubbles produced in situ chemically, small, hollow, dispersed glass or plastic spheres and other porous, gas-entraining solids, such as expanded perlite.
- the present invention relates to water-gel explosive compositions of this general type. It more particularly relates to low-density water-gel explosive compositions having a density of less than 0.7 g/ml.
- ANFO ammonium nitrate
- fuel oil or equivalent The most commonly used explosive is ANFO, which is a blend of ammonium nitrate (AN) prills and fuel oil or equivalent.
- ANFO suffers from the disadvantage that it is not water-resistant and therefore may be used successfully only in dry boreholes, in boreholes that have been dewatered or lined with a water-resistant liner or in packaged form in "wet" applications. These methods of using ANFO in wet applications involve additional time and/or expense. Even in dewatered boreholes, water seepage with time may degrade the loaded ANFO due to dissolution of the AN.
- ANFO has a relatively low density (from about 0.82 to about 0.9 g/ml) and thus is suited for applications requiring relatively low bulk explosive energy, such as for presplit applications and blasting of "soft" rock, coal or overburden. Even so, the explosive energy of ANFO may exceed that desired for certain "soft” blasting applications such as blasting of coal seams that ideally required less explosive energy than even that produced by ANFO. Such "soft" blasting operations also may be in wet boreholes that require dewatering.
- Water-gel explosives satisfy one of these needs in that they generally are water-resistant due to the thickened, continuous aqueous phase thereof. However, the densities thereof are generally much higher than those even of ANFO, generally ranging from 0.9 to 1.6 g/ml and usually well above 1.0 g/ml.
- Australian Patent no. 550,930 discloses a "melt explosive composition” that may have a density as low as 0.3 g/ml for low energy applications, but these compositions are distinguished from “water-gels” in that the melt compositions are "not diluted by an appreciable amount of water,” and therefore have a higher energy per unit weight, and comprise a melt of oxidizer and fuel mixed with oiled ammonium nitrate prills.
- the present invention provides a low-density water-gel explosive composition which comprises a continuous phase of inorganic oxidizer salt solution comprising water and/or water-miscible organic liquids in an amount of from 10 to 40% by weight of the solution, ammonium nitrate particles in an amount of from 10 to 70% of the composition, a thickening agent, a cross-linking agent, solid and/or water-immiscible organic liquid fuel and a dispersion of chemically-produced gas bubbles in a quantity sufficient to reduce the density of the composition to less than 0.7 g/ml characterised in that the ammonium nitrate particles are in prill form and contain water-immiscible organic liquid fuel.
- the invention also provides a process for the production of such explosive composition characterised in that it comprises forming the inorganic oxidizer salt solution, pre-thickening the solution with the thickening agent, adding the fuel, dispersing a chemical gassing agent throughout the pre-thickened solution to form a fine, stable dispersion of gas bubbles in a quantity sufficient to reduce the density to less than 0.7 g/ml and cross-linking the thickened solution by the addition of the cross-linking agent, the ammonium nitrate particles in prill form optionally being added to the pre-thickened solution, thus meeting both of the described needs for water-resistance and low energy.
- Another advantageous characteristic of these compositions for "soft" blasting operations is that they may have relatively low detonation velocities.
- the inorganic oxidizer salt solution forming the continuous phase of the explosive generally comprises ammonium nitrate in an amount of from about 30 to about 90%, and water and/or water-miscible organic liquids in an amount of from about 10 to about 40%, by weight of the solution.
- the oxidizer salts are generally selected from ammonium, alkali metal and alkaline earth metal nitrates, chlorates and perchlorates.
- the preferred oxidizer salt is ammonium nitrate (AN), but calcium nitrate (CN) and sodium nitrate (SN) or other oxidizer salts may be used.
- the total solubilized oxidizer salt employed is preferably from about 50 to about 86%.
- ammonium nitrate in solid form or ANFO AN prills and fuel oil may additionally be added to the compositions.
- the total amount of water and/or water-miscible liquid present in the composition is generally from about 10 to about 40% by weight of the solution.
- the use of water and/or water-miscible liquid in amounts within this range will generally allow the compositions to be sufficiently fluid to be pumped by conventional slurry pumps at formulation or mixing temperatures, i.e., about the crystallization temperature (fudge point) of the composition. After pumping, precipitation of some of the dissolved oxidizer salt may occur upon cooling to temperatures below the fudge point, although re-pumpable formulations may experience little, if any, precipitation.
- the fuel may be solid and/or liquid.
- solid fuels which may be used include aluminium particles and carbonaceous materials such as gilsonite or coal.
- Liquid or soluble fuels may include either water-miscible or -immiscible organics. Miscible liquid or soluble fuels include alcohols, such as methyl alcohol, glycols, such as ethylene glycol, amides such as formamide, urea, and analogous nitrogen-containing liquids. These fuels generally act as a solvent for the oxidizer salt or water extender and, therefore, may replace some or all of the water.
- Water-immiscible organic liquid fuels may be aliphatic, alicyclic and/or aromatic and either saturated and/or unsaturated.
- toluene and the xylenes may be employed.
- Aliphatic and aromatic nitro-compounds may also be used.
- Preferred fuels include mixtures of normally-liquid hydrocarbons generally referred to as petroleum distillates, such as gasoline, kerosene and diesel fuels.
- a particularly preferred liquid fuel is No. 2 fuel oil.
- Tall oil and paraffin oil may also be used. Mixtures of the above fuels may be used.
- the water-immiscible organic liquid fuel is combined with ammonium nitrate prills before it is added to the composition.
- the fuel is generally present in an amount to provide an overall oxygen balance of from about -10 to about 0 percent.
- Fuel oil when used, is normally used in amounts of from about 1 to about 8%, by weight, preferably from about 3 to about 7%, and when used as the sole fuel, is preferably used in amounts of from about 4 to about 6%, by weight.
- the aqueous fluid phase of the composition is rendered viscous by the addition of one or more thickening agents of the type and in the amount commonly employed in the art.
- thickening agents include galactomannin, preferably guar, gums; guar gum of reduced molecular weight as described in US Patent No 3,788,909, polyacrylamide and analogous synthetic thickeners, flours and starches. Biopolymer gums, such as those described in US Patent No 3,788,909 may also be used.
- Thickening agents are generally used in amounts ranging from about 0.2 to about 2.0%, but flours and starches may be employed in much greater amounts of up to about 10% in which case they also function importantly as fuels. Mixtures of thickening agents may be used.
- the thickening agent is preferably used in an amount sufficient to pre-thicken the aqueous solution to a viscosity of at least 500 centipoise (mPas) (Brookfield viscometer, Model HATD, No. 2 HA spindle at 100 rpm) prior to the addition of the density-reducing agent as described below.
- mPas centipoise
- density-reducing agents are employed to lower and control the density of and to impart sensitivity to water-gel explosive compositions.
- the present compositions preferably employ a small amount, e.g. from about 0.01 to about 0.2% or more, of a chemical gassing agent to obtain a composition density of less than 0.7 g/ml.
- the compositions according to the present invention preferably have a density of less than 0.6 g/ml.
- a preferred gassing agent is a nitrite salt, such as sodium nitrite, which chemically reacts in the solution of the composition to produce gas bubbles.
- Other trace ingredients may also be added to enhance gassing rates or adjust pH.
- a cross-linking agent is employed in the present compositions.
- Cross-linking agents for cross-linking the thickening agents are well known in the art. Such agents are usually added in trace amounts and usually comprise metallic ions, such as dichromate or antimony ions.
- the preferred cross-linking agent is antimony ion, preferably from potassium pyroantimonate, in an amount of from about 0.001 to about 0.1%.
- solid ammonium nitrate (AN) prills are added in an amount of from about 10 to about 70% of the total composition.
- Water-immiscible organic liquid fuel may preferably be added to the prills prior to adding the prills to the composition. This is the preferred manner of adding the water -immiscible organic liquid fuel to the composition, because when added separately it tends to fluidize the mixture and thus reduce its viscosity, thereby decreasing the ability of the aqueous phase to entrain air or hold gas bubbles.
- the explosives may be prepared by first forming a solution of the oxidiser salt and water and/or water-miscible organic liquids (including miscible liquid fuel, if any) at a temperature above the fudge point or crystallization temperature of the solution. Typically, the explosives are prepared at a temperature of at least 10C° above the fudge point. The thickening agent is then added to pre-thicken the solution to a desired degree, preferably to a viscosity of at least 500 centipoise (mPas) (Brookfield viscometer).
- mPas centipoise
- the density-reducing agent preferably a chemical gassing agent
- the density-reducing agent is then added and dispersed throughout the pre-thickened solution to form a fine, stable dispersion of air or gas bubbles in a volume sufficient to reduce the density to the desired level.
- a cross-linking agent is then preferably added to cross-link the thickened solution and impart final desired rheology.
- Ammonium nitrate particles containing water-immiscible organic liquid fuel are added to the pre-thickened solution and dispersed uniformly throughout the composition.
- Conventional metering, blending and mixing apparatus may be employed in the above steps, which may be performed in a continuous or batch process.
- Table 2 shows a composition in accordance with the present invention that has been gassed to the extremely low density of 0.28 g/ml. Even at this very low density, the composition detonated in larger diameters unconfined and in a steel pipe of 100 millimetres internal diameter.
- Table 3 shows a composition according to the present invention that is re-pumpable, i.e. one that remains fluid enough to be transported from its place of production to a storage or blasting site where it is the "re-pumped” from a transportation container into a borehole or storage container.
- the gassing and cross-linking agents are not generally added to the composition until just prior to delivery into a borehole.
- the explosive compositions according to the present invention may be used in a conventional manner. They may be plant-mixed to a desired degree of fluidity and then transported to a blasting site where they may be re-pumped into boreholes following the addition of gassing and cross-linking agents. They may also be mixed on-site in a site-mixed system or truck as is known in the art. Since the densities thereof are below that of water, they are generally loaded into dry or dewatered boreholes. As previously indicated, the compositions are water-resistant and may thus be used effectively in boreholes that may have some water present, such as in dewatered boreholes that experience seepage. They may also be used in packaged form.
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Abstract
Description
1 | 2 | 3 | 4 | |
AN (in solution) | 53.62 | 51.59 | 49.60 | 47.31 |
H2O | 15.60 | 17.68 | 19.98 | 22.27 |
Guar Gum | 0.42 | 0.45 | 0.28 | 0.28 |
Fuel Oil | 4.58 | 4.46 | 4.34 | 4.34 |
AN Prill | 25.00 | 25.00 | 25.00 | 25.00 |
Cross-linking Agent | 0.07 | 0.07 | 0.05 | 0.05 |
Gassing Agent | 0.65 | 0.64 | 0.65 | 0.65 |
Acetic Acid (60%) | 0.06 | 0.10 | 0.10 | 0.10 |
Oxidizer Solutions | ||||
Fudge Point (°C) | 50 | 40 | 30 | 20 |
pH | 5.0 | 5.2 | 5.4 | 5.4 |
Viscosity (centipoise) (mPas) | 1100 | 1150 | 1090 | 1000 |
Temperature (°C) | 80 | 55 | 48 | 40 |
Initial Density (g/ml) | 0.56 | 0.62 | 0.66 | 0.66 |
Temperature (°C) | 65 | 45 | 35 | 30 |
Results at 5°C (24 hour storage) | ||||
Density (g/ml) | 0.55 | 0.65 | 0.66 | 0.67 |
Detonation Velocity (km/s) | ||||
75 mm | - | - | - | - |
100 mm | - | 2.3 | - | - |
125 mm | 2.3 | 2.6 | - | 2.4 |
Minimum Booster, 125 mm, det/fail (g of pentolite) | 340g/- | 50g/18g | - | 340g/- |
Critical Diameter, det/fail (mm) 100/75 | 125/100 | 100/75 | - | 125/100 |
Results at 20°C | ||||
Density (g/ml) | 0.55 | 0.65 | 0.66 | 0.67 |
Detonation Velocity (km/s) | ||||
63 mm | 1.8 | 1.9 | - | - |
75 mm | 1.9 | 2.3 | 2.0 | 2.2 |
100 mm | 2.2 | - | 2.4 | 2.4 |
125 mm | 2.5 | - | 2.4 | - |
150mm | - | - | - | - |
Formulation: | ||
AN | 49.67 | Oxidizer Solution |
H2O | 20.00 | Fudge Point: 30°C |
Guar Gum | 0.29 | pH: 5.0-5.5 |
AN prill | 25.00 | Viscosity: 1100 cps (mPas) |
Fuel Oil | 4.34 | Temperature: 75°C |
Gassing agent | 0.60 | |
Acetic Acid (50%) | 0.05 | |
Cross-linking agent | 0.05 | |
Initial density: 0.28-0.5 g/ml | ||
Results at 30°C | ||
Density (g/ml) 0.28 | ||
Detonation velocity (km/s) unconfined cardboard tubes - 340g booster | ||
100 mm | Failed | |
125 mm | Low order | |
150 mm | 1.7 Det | |
292 mm | 2.0 Det | |
Results at 5°C, 340g booster | ||
100 mm (confined) | 2.3 Det | |
150 mm (unconfined) | Low order | |
D (km/s) Two week storage results at 5°C | ||
125 mm (confined) | 2.3 Det |
Formulation: | |
AN (in solution) | 30.00 |
Urea | 10.00 |
H2O | 17.73 |
Guar gum | 0.60 |
ANFO (pre-mixed, 94/6) | 40.00 |
Cross-linking agent | 0.07 |
Gassing agent | 1.00 (10/30/60, NaSCN/NaNO2/H2O) |
Acetic acid (60%) | 0.6 |
Oxidizer solution: | |
Fudge point (°C) | ∼0 |
pH | 4.5 |
Viscosity (cps) (mPas) | ∼5000 |
Temp | ∼20°C |
Results at 20°C: | |
Density (g/ml) D (m/s) | 0.55 |
100 mm | 1550 |
125 mm | 2230 |
150 mm | 2350 |
Minimum booster, 150 mm, det/fail | 90g/50g |
(At 5°C 150 mm fails) |
Claims (13)
- A low density water-gel explosive composition which comprises a continuous phase of inorganic oxidizer salt solution comprising water and/or water-miscible organic liquids in an amount of from 10 to 40% by weight of the solution , ammonium nitrate particles in an amount of from 10 to 70% of the composition, a thickening agent, a cross-linking agent, solid and/or water-immiscible organic liquid fuel and a dispersion of chemically-produced gas bubbles in a quantity sufficient to reduce the density of the composition to less than 0.7 g/ml, characterised in that the ammonium nitrate particles are in prill form and contain water-immiscible organic liquid fuel.
- A composition as claimed in claim 1 wherein the inorganic oxidizer salt solution comprises water and an inorganic oxidizer salt selected from ammonium, alkali metal and alkaline earth metal nitrates and perchlorates.
- A composition as claimed in claim 1 or claim 2 wherein ammonium nitrate is the predominant, or preferably the sole, oxidizer salt used.
- A composition as claimed in any of claims 1 to 3 wherein the thickening agent is guar gum.
- A composition as claimed in any of claims 1 to 4 wherein the cross-linking agent is an antimony ion, preferably potassium pyroantimonate.
- A composition as claimed in any of claims 1 to 5 wherein the water-immiscible organic liquid fuel is No. 2 fuel oil.
- A composition as claimed in any of claims 1 to 6 wherein the inorganic oxidizer salt solution comprises a water-miscible fuel, the water-miscible fuel preferably being selected from alcohols, glycols, amines, and urea.
- A composition as claimed in any of claims 4 to 7 wherein the inorganic oxidizer salt solution comprises ammonium nitrate in an amount of from 30 to 90%, a cross-linking agent in an amount of from 0.001 to 0.1%, guar gum in an amount of from 0.2 to 2% and fuel including water-immiscible organic liquid fuel in an amount of from 0 to 6%.
- A process for the production of a low-density water-gel explosive composition as claimed in any of claims 1 to 8 characterised in that it comprises forming an inorganic oxidizer salt solution, pre-thickening the solution with a thickening agent, adding a fuel, dispersing a chemical gassing agent throughout the pre-thickened solution to form a fine, stable dispersion of gas bubbles in a quantity sufficient to reduce the density to less than 0.7 g/ml and cross-linking the thickened solution by the addition of a cross-linking agent.
- A process as claimed in claim 9 wherein the solution is pre-thickened to a viscosity of at least 500 centipoise (mPas).
- A process as claimed in claim 9 or claim 10 wherein it further comprises adding and dispersing throughout the pre-thickened solution solid ammonium nitrate particles.
- A process as claimed in claim 11 wherein the ammonium nitrate particles are in prill form and contain up to 6% water-immiscible organic liquid, by weight of the particles.
- A method of blasting in an application requiring relatively low bulk explosive energy characterised in that it comprises forming a low-density water-gel explosive composition as claimed in any of claims 1 to 8, and loading the resulting composition into a dry or dewatered borehole.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87713392A | 1992-05-01 | 1992-05-01 | |
US877133 | 1992-05-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0568387A1 EP0568387A1 (en) | 1993-11-03 |
EP0568387B1 true EP0568387B1 (en) | 1998-07-15 |
Family
ID=25369328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93303408A Expired - Lifetime EP0568387B1 (en) | 1992-05-01 | 1993-04-30 | Low-density water-gel explosive composition, production and use thereof |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0568387B1 (en) |
AT (1) | ATE168366T1 (en) |
AU (1) | AU660362B2 (en) |
BR (1) | BR9301715A (en) |
CA (1) | CA2095260C (en) |
DE (1) | DE69319654T2 (en) |
NO (1) | NO180116C (en) |
ZA (1) | ZA932948B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10163978B4 (en) * | 2001-12-22 | 2005-11-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Gel fuel, process for its preparation and its use |
EP2784052A1 (en) * | 2013-03-27 | 2014-10-01 | Maxamcorp Holding, S.L. | Method for the "on-site" manufacture of water-resistant low-density water-gel explosives |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3390030A (en) * | 1967-01-04 | 1968-06-25 | Hercules Inc | Aqueous slurry blasting composition of non-explosive ingredients containing silicon ad an aeration agent |
US3886010A (en) * | 1972-07-24 | 1975-05-27 | Ireco Chemicals | Stabilized and aerated blasting slurry containing thiourea and a nitrite gassing agent |
US3788909A (en) * | 1972-11-24 | 1974-01-29 | Ireco Chemicals | Aqueous blasting compositions containing an immiscible liquid hydrocarbon fuel and method of making same |
CA1096172A (en) * | 1978-11-08 | 1981-02-24 | Anthony C. F. Edmonds | Gelled aqueous slurry explosive containing gas bubbles |
US4889570A (en) * | 1989-03-23 | 1989-12-26 | Eti Explosives Technologies International (Canada), Ltd. | Blasting explosive with improved water resistance |
-
1993
- 1993-04-27 AU AU37154/93A patent/AU660362B2/en not_active Ceased
- 1993-04-27 ZA ZA932948A patent/ZA932948B/en unknown
- 1993-04-28 NO NO931544A patent/NO180116C/en not_active IP Right Cessation
- 1993-04-30 BR BR9301715A patent/BR9301715A/en not_active IP Right Cessation
- 1993-04-30 DE DE69319654T patent/DE69319654T2/en not_active Expired - Fee Related
- 1993-04-30 EP EP93303408A patent/EP0568387B1/en not_active Expired - Lifetime
- 1993-04-30 CA CA002095260A patent/CA2095260C/en not_active Expired - Fee Related
- 1993-04-30 AT AT93303408T patent/ATE168366T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69319654D1 (en) | 1998-08-20 |
CA2095260C (en) | 1999-08-17 |
NO931544L (en) | 1993-11-02 |
NO180116C (en) | 1997-02-19 |
CA2095260A1 (en) | 1993-11-02 |
AU660362B2 (en) | 1995-06-22 |
NO931544D0 (en) | 1993-04-28 |
DE69319654T2 (en) | 1998-11-26 |
ATE168366T1 (en) | 1998-08-15 |
AU3715493A (en) | 1993-11-04 |
EP0568387A1 (en) | 1993-11-03 |
ZA932948B (en) | 1993-12-07 |
BR9301715A (en) | 1993-11-03 |
NO180116B (en) | 1996-11-11 |
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