JP2005029447A - Ammonium nitrate oil agent-base explosive composition and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the dust of fine particles of explosives which is the major cause for the production of granular lumps and the generation of ammonia smells during production which are long-standing problems with ammonium nitrate oil agent-base explosives. <P>SOLUTION: This ammonium nitrate oil agent-base explosive composition consists of an oxidizer of 90-98 wt% and a fuel of 2-10 wt% and involves fine particles, having a diameter of 0.85 mm or less, of 2.0 wt% or less. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to industrial explosives. In particular, mining and industrial fields such as civil engineering, quarrying, mining, coal mining, tunnel excavation, and agricultural and forestry fields such as drainage, irrigation, clearing, root extraction, and logging, and crushing and drilling in marine fields such as removing seaweed and mud in the sea. This relates to the explosives of ammonium nitrate based oil used in the blasting field.

  Since the explosive sensitivity of the ammonium nitrate oil is relatively low and there is no detonator initiation, it does not explode easily unless a booster such as dynamite is used. In addition, in recent years, opportunities for use in tunnels and the like have been increasing due to the low cost while having the problem of poor water resistance and poor gas after blasting.

  Methods for adding aromatic dinitrotoluene and metal powder as disclosed in Patent Document 1, as disclosed in Non-Patent Document 1 and Patent Document 2, such as aluminum powder, magnesium powder A method of adding a metal powder such as Non-Patent Document 2 or Patent Document 3, a method of heating at the time of or after mixing ammonium nitrate and light oil, and a polymer microvalve as shown in Patent Document 4 -A method of using encapsulated microspheres such as glass or glass balloons in prill ammonium sulfate, and adjusting the oil absorption rate and bulk specific gravity of porous prill ammonium as shown in Patent Document 5 There are known methods for improvement, methods for improving explosive performance by incorporating micro hollow spheres into porous prill ammonium as disclosed in Patent Document 6, and the like.

As a measure for improving water resistance, a method of adding waxes and resins shown in Patent Document 7, high absorption of starch-polyacrylonitrile hydrolyzate, vinyl acetate-acrylic acid ester copolymer, etc. as shown in Patent Document 8 A method of adding a functional resin is known.
As a measure for suppressing ammonia generation at the tunnel blasting site where a large amount of spraying concrete is used, an acidic substance as shown in Patent Document 9 is sprayed or sprayed, and basic substances such as ammonium nitrate and concrete are used. A method for suppressing the reaction of is known.

  However, although the explosive performance and water resistance are somewhat improved in any of the above-described methods for the ammonium nitrate explosive-based explosive composition, ammonia odor and handling are one of the problems in consumption and manufacture. Sexuality was not necessarily improved. In particular, the working environment is reduced by the generation of ammonia gas due to the reaction between fine dust particles mainly composed of ammonium nitrate, which are generated when loading explosives in the blasting hole at the tunnel blasting site, and spraying concrete used in large quantities. The problem of being harmed remained unresolved. In addition, when producing a salt-based explosive explosive, ammonium sulfate particles containing light oil often gather together to form an explosive agglomerate having a major axis of about 5 to 10 cm, which may hinder safe and efficient production. If the explosive agglomerates are mixed into the product without being removed, they will grow further during storage and the entire explosive will solidify, resulting in a significant deterioration in quality. Thus, there remains a problem that the safe and efficient loading work at the blasting site is hindered.

JP-A-8-59384 JP-A-2-221178 Japanese Patent Laid-Open No. 8-48590 Japanese Patent Laid-Open No. 7-187661 JP 2001-21368 A JP 2001-39789 A JP-A-2-22979 JP-A-9-208356 JP-A-9-273900 Konomi, “Metal Smelting Explosive Composition Experiment”, Journal of Industrial Explosives, Vol.30, No.124-129 Fukuyama, Ogawa, “Explosiveness of Ammonia (1st report)”, Journal of Industrial Explosives, Vol. 44, No. 208-213 (issued in 1983)

  An object of the present invention is to solve the above-mentioned problems, and provide an ammonium nitrate-based explosive composition having improved ammonia odor and handling property and hardly forming explosive agglomerates and a method for producing the composition. The present invention further provides a safe and efficient method for producing an explosive composition of an ammonium nitrate-based explosive that can be produced safely and efficiently, is unlikely to cause quality degradation, is less likely to cause clogging at the blasting site, and can be loaded efficiently. To do other purposes.

  As a result of diligent research to solve the above-mentioned problems, the present inventors have focused on the composition of explosive particles of a safe oil-based explosive composition, and fine particles having a particle diameter of 0.85 mm or less, that is, JIS-Z8801- Fine particles that pass through a 1994 sieve nominal size of 0.85 mm are more than 2% by weight of the entire explosive particles, and in particular, particles that pass through a JIS-Z8801-1994 sieve nominal size of 0.85 mm, as in the case of ordinary explosives. When fine particles with a diameter of 0.85 mm or less are contained in about 6 to 10% by weight of the entire explosive, particles of 0.85 to 1.7 mm occupying 50% by weight or more of the total amount of ordinary explosive based explosives are adhered to each other. It has been found that the frequency of forming explosive agglomerates with a major axis of 5 to 10 mm is increased, and further, the agglomerates are pulverized into the above-mentioned fine particles, or a JIS sieve nominal size of 0.85 m When the amount of fine particles passing through the explosive particle exceeds 2% by weight of the entire explosive particle, dust is generated when the explosive is loaded into the blasting hole in a tunnel, etc., and there is a strong alkali and uncured concrete or rock mass. The reaction frequency also increased, and it was found that the ammonia generation frequency was increased, and the present invention was completed.

That is, the present invention is as follows.
(1) An anti-nitrile explosive composition comprising 90 to 98% by weight of an oxidant and 2 to 10% by weight of fuel, 2 particles having a particle size of 0.85 mm or less contained in the explosive composition of the anti-sulfur oil type A composition for explosive composition based on ammonium nitrate, characterized by being not more than 0.0% by weight.
(2) The explosive composition according to (1), wherein the oxidizing agent comprises one or more selected from ammonium nitrate, sodium nitrate, calcium nitrate, potassium nitrate and potassium sulfate.
(3) The oxidizing agent is prill ammonium nitrate, and the oil absorption is 22 to 30% by weight, the hardness is 5 to 15%, and the bulk specific gravity is 0.5 to 0.75 (1) Or the ammonium nitrate explosive composition as described in (2).
(4) The fuel oil explosive composition according to (1), (2), or (3), wherein the fuel contains at least light oil.
(5) After mixing 90 to 98% by weight of oxidant and 2 to 10% by weight of fuel, fine particles are removed so that fine particles having a particle size of 0.85 mm or less are 2% by weight or less of the whole. A method for producing a composition of explosive composition based on ammonium nitrate.
(6) An anti-nitrate explosive composition characterized by mixing 90 to 98% by weight of an oxidant from which fine particles having a particle size of 0.85 mm or less have been removed in advance and 2 to 10% by weight of fuel. Production method.

  The explosive composition of the present invention and the production method thereof not only greatly reduce fine particle dust mainly composed of ammonium nitrate, which is a main cause of ammonia odor, which has been generated at the time of loading operation at a tunnel blasting site, The frequency of troubles in the manufacturing process has been greatly reduced, and work efficiency and safety during explosives production have been significantly improved.

  As described above, the present invention provides, for example, a conventional ammonium nitrate oil agent by making fine particles having a particle size of 0.85 mm or less 2% by weight or less of the whole explosive in an ammonium nitrate oil-based explosive mainly composed of an oxidant and a fuel. Explosive agglomerates with a major axis of 5 to 10 mm, which was a cause of trouble during explosives production, were reduced, greatly improving the safety of explosive production work, and dust mainly composed of ammonium nitrate, which was a concern at the blasting site. Can also be reduced.

Hereinafter, the present invention will be described in detail with a focus on the best mode.
The ammonium nitrate explosive composition of the present invention is an ammonium explosive explosive composition comprising 90 to 98% by weight of an oxidant and 2 to 10% by weight of fuel. It is characterized in that the following fine particles are 2% by weight or less of the whole.

  What should be noted in the present invention is that, for example, when ammonium nitrate powder particles containing diesel oil having a particle diameter of 0.85 mm or less that pass a JIS sieve nominal size of 0.85 mm are adjusted to about 2 wt% or less in the explosive composition, blasting In addition to greatly improving the generation of stimulating dust on the human skin that occurs on-site, the frequency of explosive agglomerates formed by the assembly of explosive fine particles generated during the manufacturing process is greatly increased. The quality of the product has been improved, and efficient and safe production has become possible.

  The oxidizing agent of the present invention may be one used for general industrial explosives. Ammonium nitrate, sodium nitrate, calcium nitrate, potassium nitrate, and potassium sulfate are preferred oxidizers that are readily available and inexpensive. In particular, prill ammonium nitrate containing porous ammonium nitrate and porous ammonium containing a micro hollow body are excellent oxidizing agents having good reactivity. The oxidizing agent is used in an amount of 90 to 98% by weight based on the total composition. If it is 90% by weight or less, or 98% by weight or more, the explosion performance is lowered and a stable detonation reaction cannot be obtained. More preferably, it is 92 to 95% by weight.

  The oil absorption rate, hardness and bulk specific gravity of the prill ammonium nitrate are not limited, but particularly preferred oil absorption rate is 22 to 30% by weight, hardness is 5 to 15%, and bulk specific gravity is 0.5 to 0.75. In particular, the oil absorption rate is higher than the prill ammonium nitrate described in JP-A-2001-213686, and more pores into which light oil penetrates into the prill ammonium nitrate particles are formed. The mixing property is improved, and the explosion reactivity is improved. Further, the hardness is lower than the hardness of prill ammonium as disclosed in JP-A-7-69772, and is effective in suppressing the pulverization phenomenon that occurs during handling.

In the present invention, the fuel generally used for industrial explosives is used. Further, the fuel is one kind of oils such as light oil and heavy oil, alcohols, polymer powders such as natural polymers and synthetic polymers, metal powders such as coal powder and aluminum powder, gilsonite, charcoal powder and wheat flour. Selected from two or more. Light oil and alcohol are suitable fuels that are easy to handle because they are liquid at room temperature. In particular, light oil is a more suitable fuel because it has good mixing properties and high reactivity.
The fuel is used in an amount of 2 to 10% by weight based on the total composition. If it is less than 2% by weight, the explosion reaction will be reduced, causing the occurrence of unsettled residue and detonation interruption. If it exceeds 10% by weight, the gas will deteriorate after blasting. Preferably it is 3 to 7 weight%.

  In order to improve the water resistance and adjust the explosive force, a known polymer, a low specific gravity substance, or an acidic substance having an ammonia suppressing action may be supplementarily added to the nitrate oil explosive composition of the present invention. The polymer that can be added to the ammonium nitrate-based explosive composition of the present invention may be a polymer used for general industrial hydrous explosives, such as guar gum, locust bean gum, guar gum derivatives, xanthan gum, polyacrylamide and the like. It consists of a natural product or a combination of two or more of synthetic polymers.

  The polymer is preferably used in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of the explosive composition. If it is less than 0.5 part by weight of the polymer, the practical water resistance tends to be lowered, and the initiation performance at the water hole at the blasting site tends to be hindered. If it exceeds 20 parts by weight, the gas tends to deteriorate after blasting. More preferably, it is 2 to 15 parts by weight. Further, the low specific gravity material that can be added to the ammonium nitrate oil-based explosive composition of the present invention is a shirasu balun, glass micro balun or pearlite foamed with shirasu, glass, pearl, etc. used in industrial explosives. One or more organic low specific gravity materials such as inorganic low specific gravity materials such as Saran hollow particles obtained by foaming resin particles are used. Shirasu balun and pearlite are less expensive than glass micro balun and saran hollow particles, and are particularly suitable when a large amount of low specific gravity is added. The low specific gravity is preferably 0.5 to 20% by weight based on the total composition. If the specific gravity is less than 0.5 parts by weight, it may be difficult to control the performance of the explosive. If the specific gravity exceeds 20 parts by weight, it may be difficult to maintain a practical explosive force.

The average particle size of the low specific gravity is preferably 0.1 to 3 mm. If it is less than 0.1 mm, dust is likely to be generated, and if it exceeds 3 mm, the explosive property tends to be reduced. More preferably, it is 1-2 mm.
The shape of the low specific gravity can be either indefinite or spherical. More preferably, the shape is close to a sphere and has a lot of minute spaces. Objects with a sealed space such as glass micro-balun can be used without any problem, but the low specific gravity of shirasu having a bulk specific gravity of about 0.15 to 0.3 which is foamed by controlling the foaming temperature low and the above-mentioned bulk. Specific gravity pumice, pearlite foam, and heat-treated attapulgite are suitable because they have a lot of open micro space and adsorb excess fuel such as light oil to keep light oil in the product.

  Further, an acidic substance described in JP-A-9-273900 can be further added to and mixed with the ammonium nitrate-based explosive composition of the present invention to further suppress the generation of ammonia. In particular, organic carboxylic acids such as citric acid, malic acid, tartaric acid, lactic acid, and fumaric acid are inexpensive and suitable acidic substances that effectively suppress the generation of ammonia. It is preferable to add 3 to 15 parts by weight of the acidic substance with respect to 100 parts by weight of the explosive composition. If the amount is less than 3 parts by weight, the effect may not be sufficient. If the amount exceeds 15 parts by weight, the explosive force tends to decrease. More preferably, it is 8-10 weight part.

According to the method for producing the explosive composition of the present invention, an explosive fine particle having a particle diameter of 0.85 mm or less is added to 2% by weight or less after mixing 90 to 98% by weight of an oxidant and 2 to 10% by weight of fuel. It removes so that it may become.
The manufacturing method of the ammonium nitrate explosive composition of the present invention is performed, for example, by the following operation.

  As a first method, a sieving oil explosive mixed with an oxidizing agent such as porous ammonium and a fuel such as light oil is sieved with a JIS sieve (nominal size 0.85 mm) to obtain fine particles of 0.85 mm or less. There is a method obtained by adjusting the total amount to 2% by weight or less.

  As a second method, pulverized with JIS sieve (nominal size 0.85 mm) and mixed with fuel such as prill nitrate and light oil adjusted so that fine particles of 0.85 mm or less are 2% by weight or less of the whole. After that, there is a method in which the powder is further sieved with a JIS sieve (nominal size 0.85 mm) and adjusted so that fine particles of 0.85 mm or less are 2% by weight or less of the whole.

  As a third method, a sieving oil-based explosive mixed with an oxidizing agent such as ammonium nitrate and a fuel such as light oil is sieved with a JIS sieve (nominal size 0.85 mm), and fine particles of 0.85 mm or less are 2 in total. For example, a method of obtaining a polymer, a low specific gravity substance, and an acidic substance by adding and mixing them after adjusting to be equal to or less than wt%.

Hereinafter, the present invention will be described by way of examples. Measurements of fine particles (particle size of 0.85 mm or less), dust, agglomerates, bulk specific gravity, and explosion speed of the ammonium nitrate oil-based explosive composition were carried out by the following methods. In addition, these were measured when 24 hours passed after manufacture.
(1) Measurement of explosive particles Set the bottom lid, JIS sieve (nominal size 0.85 mm) and JIS sieve (nominal size 1.7 mm) in this order on a low-tap shaker. Place in a sieve with a dimension of 1.7 mm and fix the top lid. Next, after classifying by operating a low-tap shaker for 10 minutes, the fine particles remaining on the bottom cover after passing through a JIS sieve (nominal size 0.85 mm) are measured, and the weight percentage of the measured value is displayed. did.

(2) Measurement of dust Preparation of 2 kg of sample is prepared in a conical plastic container having a discharge port (diameter 5 cm) that can be opened and closed at the bottom. Next, the plastic container filled with the sample is opened from the floor at about 1 m above the floor, the sample is dropped naturally, the sample is measured by a sensory test, and a lot of dust is generated. A small number was displayed as ○.

(3) Measurement of agglomerates A 2 kg sample is prepared for filling in a plastic container having a discharge port (diameter 5 cm) that can be opened and closed at the bottom. Next, the container filled with the sample is opened from the floor at a height of about 1 m above the floor surface, the sample is dropped naturally, the particle mass is measured by a sensory test, and there are many particles or particles. The case where the lump blocked the discharge port and stopped falling was indicated as x, and the case where the lump did not stop was indicated as ◯.

(4) Measurement of oil absorption rate Oil absorption rate is measured according to the method defined by the Industrial Explosives Association. The details are as follows.
50 g of a sample is collected and weighed on a glass filter (diameter 40 mm, depth 50 mm), and this is set in a vacuum apparatus. Next, while injecting 40 ml of light oil into the glass filter, gently agitate the sample particles so that the particles of the sample do not break, mix the sample and light oil, and after 5 minutes, open the cock attached to the glass filter and leave for 2 minutes. After letting it fall naturally and further sucking with a vacuum pump for 5 minutes (flow rate of 30 L / min), weigh the glass filter containing the sample that has absorbed light oil. After finishing the above measurement, the ratio (%) of the oil absorption increase (g) to the first sample 50 g is displayed as the oil absorption rate (%).

(5) Measurement of hardness Hardness is measured according to the method specified by the Industrial Explosives Association. The details are as follows.
A sample of 50 g is placed in a tray of a hardness measuring device (standard prill ammonium hardness measuring device), spread on the entire surface of the plate on average, and a grinding plate is stacked on top of this to drive the device. After a certain period of time has elapsed, the apparatus is stopped, and after resting, the sample on the pan is placed on a predetermined sieve, set on a shaker and shaken for 1 minute, and the crushing portion (g) passing through the sieve is collected and weighed. After finishing the above measurement, the ratio (%) of the crushing content (g) to the first sample 50 g is displayed as hardness.

(6) Measurement of bulk specific gravity The bulk specific gravity of the ammonium nitrate-based explosive and prill ammonium nitrate was measured according to JIS-K6721. Specifically, a sample is filled into a funnel having a diameter of 90 mm at the upper end, a diameter of 15 mm at the lower end, and a height of 15 mm set on the support base, and a damper at the opening provided at the lower portion of the funnel is slid. Then, the sample is poured into a cup having a lower volume of 100 ccc, and the sample raised in the cup is removed with a spatula so as to be horizontal at the same height as the upper end of the cup, and the weight of the sample in the cup is weighed. The value obtained by dividing the sample weight (g) in the cup by the cup volume (cc) after the above operation was displayed as the bulk specific gravity.

(7) Explosion velocity measurement About 350 g of a sample lightly tamped and filled into a steel pipe (JIS G 3452 35A steel pipe, 350 mm long) was detonated with a detonator with a booster (No. 3 paulownia dynamite) 50 g, and an optical fiber method (Japanese Society of Fire Pharmacy) The detonation speed of the sample was measured according to standard ES-41 (3)), and the result was displayed as the explosion speed.

[Example 1]
Prill Nissan (Mitsubishi Chemical Co., Ltd .; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6) obtained by sieving little by little with a JIS sieve (nominal size 0.85 mm) and removing fine particles of 0.85 mm or less. .9%) After 4,600 g was weighed and stored in a plastic bag, 400 g of No. 2 diesel oil (commercially available) weighed in advance was added to the prill ammonium nitrate in the plastic bag, and No. 2 diesel oil and prill ammonium nitrate were sufficient And the mixture was allowed to stand for 24 hours to obtain a powdered explosive explosive which is a granular explosive composition of the present invention. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 2]
Prill Nissan (Mitsubishi Chemical Co., Ltd .; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6) obtained by sieving little by little with a JIS sieve (nominal size 0.85 mm) and removing fine particles of 0.85 mm or less. 0.9%) After 4,700 g was weighed and stored in a plastic bag, 300 g of commercially available No. 2 diesel oil was added to the prill ammonium nitrate in the plastic bag, and No. 2 diesel oil and prill ammonium nitrate were fully added. After mixing, the mixture was allowed to stand for 24 hours to obtain a salt oil explosive composition which is a granular explosive composition of the present invention. Thereafter, fine particles, dust, agglomerates, bulk specific gravity, and explosion speed were measured using this ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 3]
A commercial No. 2 diesel oil that weighed and stored 4,850 g of prill nitrate (Mitsubishi Chemical Corporation; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6.9%) in a plastic bag. 150 g was added to the prill ammonium nitrate in the plastic bag, and No. 2 diesel oil and prill ammonium nitrate were mixed thoroughly and allowed to stand for 24 hours to obtain the ammonium nitrate oil-based explosive composition which is the granular explosive composition of the present invention. . Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 4]
A commercially available No. 2 that weighed and stored 4,850 g of prill nitrate (Mitsubishi Chemical Corporation; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6.9%) in a plastic bag. Add 150 g of light oil to the prill ammonium nitrate in the plastic bag, thoroughly mix No. 2 light oil and prill ammonium nitrate, and let stand for 24 hours, and sift it little by little with a JIS sieve (nominal size 0.85 mm). The ammonium nitrate explosive composition of the present invention was obtained by removing fine particles of 0.85 mm or less. Thereafter, fine particles, dust, agglomerates, bulk specific gravity, and explosion speed were measured using this ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 5]
Commercially available No. 2 diesel oil after weighing and storing 4,500 g of prill nitrate (bulk specific gravity 0.594, manufactured by Mitsubishi Chemical Corporation, oil absorption 24.5%, hardness 6.9%) in a plastic bag Add 500 g to the prill ammonium nitrate in the plastic bag, thoroughly mix No. 2 diesel oil and prill ammonium nitrate, and let stand for 24 hours, then sieve the powder with a JIS sieve (nominal size 0.85 mm) little by little. After confirming that the fine particles of .85 mm or less were 1% by weight or less, a nitrate oil-based explosive composition which was a granular explosive composition of the present invention was obtained. Thereafter, fine particles, dust, agglomerates, bulk specific gravity, and explosion speed were measured using this ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 6]
No. 2 commercially available, which weighed and stored 4,640 g of prill nitrate (Mitsubishi Chemical Corporation; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6.9%) in a plastic bag. 360g of diesel oil is added to the prill ammonium nitrate in the plastic bag, and the No. 2 diesel oil and prill ammonium nitrate are mixed thoroughly and allowed to stand for 24 hours, and sieved little by little with a JIS sieve (nominal size 0.85mm). It was confirmed that the fine particles of 0.85 mm or less were 1.5% by weight or less, and the ammonium nitrate-based explosive composition of the present invention was obtained. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 7]
Prill Nissan (Mitsubishi Chemical Co., Ltd .; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6) obtained by sieving little by little with a JIS sieve (nominal size 0.85 mm) and removing fine particles of 0.85 mm or less. .9%) After weighing 4,775 g in a plastic bag, add 225 g of commercially available No. 2 diesel oil to the prill ammonium nitrate in the plastic bag, and fully add No. 2 diesel oil and prill ammonium nitrate. The explosive that was mixed and allowed to stand for 24 hours was sieved little by little with a JIS sieve (nominal size 0.85 mm), and after confirming that the fine particles of 0.85 mm or less were 1% by weight or less, 350 g of citric acid (Reagent grade 1) was added and mixed to obtain a safe oil-based explosive composition of the present invention. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Example 8]
Prill Nissan (Mitsubishi Chemical Co., Ltd .; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6) obtained by sieving little by little with a JIS sieve (nominal size 0.85 mm) and removing fine particles of 0.85 mm or less. .9%) After 4,800 g was weighed and stored in a plastic bag, 200 g of commercially available No. 2 diesel oil was added to the prill ammonium nitrate in the plastic bag, and No. 2 diesel oil and prill ammonium nitrate were fully added. After mixing the explosives that were allowed to stand for 24 hours with a JIS sieve (nominal size 0.85 mm), and confirming that the fine particles of 0.85 mm or less were 1% by weight or less, polyacrylamide powder (Kurita Chemical Co., Ltd., trade name Cliff Rock PN161) 500 g was added and mixed to obtain the ammonium nitrate oil explosive composition of the present invention. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Comparative Example 1]
A commercial No. 2 diesel oil that weighed and stored 4,440 g of prill nitrate (Mitsubishi Chemical Corporation; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6.9%) in a plastic bag. 360 g was added to the prill ammonium nitrate in the plastic bag, and the prill ammonium nitrate of the same lot as the previously produced prill ammonium nitrate was sieved with a JIS sieve (nominal size 0.85 mm) to obtain 0. 200 g of fine ammonium nitrate particles of 85 mm or less were added, and No. 2 diesel oil and ammonium nitrate were mixed thoroughly and allowed to stand for 24 hours to obtain an ammonium nitrate explosive. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the explosive as a sample. The results are shown in Table 1.

[Comparative Example 2]
A commercial No. 2 diesel oil that weighed and stored 4,240 g of prill nitrate (Mitsubishi Chemical Corporation; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6.9%) in a plastic bag. 360 g was added to the prill ammonium nitrate in the plastic bag, and the prill ammonium nitrate of the same lot as the previously produced prill ammonium nitrate was sieved with a JIS sieve (nominal size 0.85 mm) to obtain 0. 400 g of fine ammonium nitrate particles of 85 mm or less were added, and No. 2 diesel oil and ammonium nitrate were thoroughly mixed and allowed to stand for 24 hours to obtain an ammonium nitrate oil explosive. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the explosive as a sample. The results are shown in Table 1.

[Comparative Example 3]
Prill Nissan (Mitsubishi Chemical Co., Ltd .; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6) obtained by sieving little by little with a JIS sieve (nominal size 0.85 mm) and removing fine particles of 0.85 mm or less. 0.9%) After 4,400 g was weighed and stored in a plastic bag, 600 g of commercially available No. 2 diesel oil was added to the prill ammonium nitrate in the plastic bag, and No. 2 diesel oil and prill ammonium nitrate were fully added. The mixture was allowed to stand for 24 hours to obtain a salt oil explosive composition. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

[Comparative Example 4]
Prill Nissan (Mitsubishi Chemical Co., Ltd .; bulk specific gravity 0.594, oil absorption 24.5%, hardness 6) obtained by sieving little by little with a JIS sieve (nominal size 0.85 mm) and removing fine particles of 0.85 mm or less. .9%) After weighing 4,925 g in a plastic bag, 75 g of commercially available No. 2 diesel oil was added to the prill ammonium nitrate in the plastic bag, and the No. 2 diesel oil and prill ammonium nitrate were fully The mixture was allowed to stand for 24 hours to obtain a salt oil explosive composition. Thereafter, fine particles, dust, agglomerates, bulk specific gravity and explosion speed were measured using the above-mentioned ammonium nitrate-based explosive as a sample. The results are shown in Table 1.

The composition of the present invention can be suitably used in the field of industrial explosives.

Claims (6)

In the ammonium nitrate explosive composition comprising 90 to 98 wt% oxidant and 2 to 10 wt% fuel, 2.0 wt% of fine particles having a particle size of 0.85 mm or less are contained in the explosive composition. % Explosive composition, characterized by being less than or equal to%. 2. The ammonium oil explosive composition according to claim 1, wherein the oxidizing agent comprises one or more selected from ammonium nitrate, sodium nitrate, calcium nitrate, potassium nitrate, and potassium sulfate. 3. The oxidizer is prill ammonium nitrate, and its oil absorption is 22 to 30% by weight, hardness is 5 to 15%, and bulk specific gravity is 0.5 to 0.75. An explosive composition of an ammonium nitrate oil-based explosive. 4. The nitrate oil explosive composition according to claim 1, 2 or 3, wherein the fuel contains at least light oil. After mixing 90 to 98% by weight of an oxidant and 2 to 10% by weight of fuel, the ammonium nitrate is characterized in that fine particles having a particle diameter of 0.85 mm or less are removed so that the total particles become 2% by weight or less. A method for producing an oil-based explosive composition. A method for producing a nitrate oil-based explosive composition, comprising mixing 90 to 98% by weight of an oxidant from which fine particles having a particle diameter of 0.85 mm or less have been removed in advance and 2 to 10% by weight of fuel.