JP2009143782A - Ammonium nitrate oil explosive cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ammonium nitrate oil explosive cartridge capable of showing markedly improved strength compared to conventional ammonium nitrate oil explosive cartridges while retaining conventional sympathetic detonation performance and initiation sensitivity (insensitivity). <P>SOLUTION: The ammonium nitrate oil explosive cartridge is obtained by packing ammonium nitrate oil explosive comprising porous prilled ammonium nitrate with a hardness of 0.1-3% and oil in a cartridge. The hardness of the prilled ammonium nitrate is determined by a test method (described on page 4 of Newsletter issued by Japan Industrial Explosive Association on July 15, 1965) comprising steps of: screening a sample through 10-14 meshes, collecting 50 g of the sample (W<SB>1</SB>) on a plate and spreading it over the entire plate; placing a milling plate over the sample and lightly gripping a handle so as to rotate the plate five times in 10 sec; and taking out the sample, screening it through a 14 mesh and collecting and weighing the ground product (W<SB>2</SB>) that has passed through the 14 mesh. The hardness is calculated by the formula: hardness=W<SB>2</SB>/W<SB>1</SB>×100(%), provided that accuracy in weighing W<SB>1</SB>is 500 g=0.5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a salt oil explosive pack.
The sachet explosive sachets are used for civil engineering construction, quarrying, mining, coal mining, mining fields such as tunnel excavation, blasting, crushing, drilling, etc. in the agricultural and forestry and marine fields.

  An ammonium explosive explosive is an explosive composed of two components having a basic composition of porous prill ammonium nitrate (94 parts) and an oil agent (6 parts) and insensitive to initiation. Compared to other industrial explosives, it can be manufactured at a low cost by a simple method, and since it can be loaded into a machine, it is widely used with some problems, and its consumption is increasing.

In Japanese Patent No. 3043672, 80% by weight or more of the salt oil explosive explosive consists of a particle size of 0.8 to less than 1.4 mm (A) and a particle size of 1.4 to 2.0 mm (B), and When the weight ratio (A / B) is set to 6/4 to 8/2, it is proposed to have the waist strength as an explosive sachet while having the conventional initiation sensitivity (insensitivity) and to improve the explosion performance. Has been.
Japanese Patent No. 3043672

However, the anti-nitrile explosive described in Japanese Patent No. 3043672 still has insufficient strength as an explosive sachet. Therefore, when loading into the blast hole at various blast sites, the waist of the explosive sachet is soft as “Knyakunya”, making it impossible to load the blast hole at a predetermined position, which may hinder the safety of the blasting work. There is a problem that the working efficiency is remarkably lowered due to the long loading time.
In addition, when storing the explosive sachet pack for a certain period of time, the explosive sap explosive using conventional prill ammonium nitrate cannot maintain the waist strength more than the above. Therefore, there is a possibility that the ammonium nitrate explosive described in Japanese Patent No. 3043672 may also become an explosive package not suitable for long-term storage.

  The present invention has been made to solve such a conventional problem, and its purpose is to significantly improve the waist strength compared to the conventional anti-depressant sachet pack, and to improve the conventional detonation performance and detonation sensitivity (insensitivity). The object is to provide an ammonium nitrate explosive pack that can be maintained.

The invention according to claim 1 is characterized in that a medicinal package is filled with an ammonium explosive explosive having a porous prill ammonium nitrate having a hardness of 0.1% to 3% obtained by the test method described below and an oil agent. And
Hardness test method (Test method described on page 4 of the Industrial Pyrotechnics published by the Japan Industrial Explosives Association on July 15, 1965)
A sample 50 g (W ₁ ) collected by sieving to 10 mesh to 14 mesh is placed in a receiving pan and spread over the entire surface of the pan. Place a ground plate on the sample, lightly grab the handle and rotate it 5 times in 10 seconds. A sample is taken out, sieved with a 14-mesh sieve, and the pulverized product passing through the 14-mesh is collected and weighed (W ₂ ).
Hardness = W ₂ / W ₁ × 100 (%)
However, the weighing accuracy in W ₁ is 500 g = 0.5

The invention according to claim 2 is the nitrate oil explosive sachet according to claim 1, wherein the particle diameter of the ammonium nitrate explosive is A from 1.40 mm to 2.00 mm, and B from 2.00 mm to 2.36 mm. In this case, (A + B) is 75% or more, preferably 80% or more, and the ratio of (A / B) is in the range of 9/1 to 6/4.
According to a third aspect of the present invention, the sagging oil explosive sachet according to the first or second aspect has a sag angle of 8 ° to 12 ° after one week and 8 ° to 17 ° after one month. It is characterized by that.
The sagging angle is fixed to 1/3 of the longitudinal direction of the salt oil explosive sachet when the amount of the powder sachet explosive sachet is 500 g × 50 mm in diameter, and the degree of bending depends on the weight of the unfixed part. Find as a corner.

  We were able to improve the weakness of the waist strength, which was a drawback of the sachet explosive sachet. In addition, the present situation can be maintained in the detonation performance and detonation performance (insensitivity).

Hereinafter, embodiments of the ammonium nitrate explosive pack according to the present invention will be described.
(Embodiment 1)
FIG. 1 shows an embodiment of an embodiment of an ammonium nitrate explosive bag 1 according to the present embodiment, in which one end of a medicine pack 3 made of nylon, an adhesive resin, and a polyethylene film is closed with a heat seal 4 and filled with an ammonium nitrate explosive 2. It is constituted by closing with.
In this embodiment, a porous prill ammonium nitrate having a hardness of 0.1% to 3% was used to produce an ammonium nitrate oil explosive. Here, as the hardness test method, the test method described on page 4 of the industry newsletter published on July 15, 1965 by the Japan Industrial Explosives Association was used.
Here, the explosive of the ammonium salt oil explosive has a particle diameter of 1.40 mm to 2.00 mm as A, 2.00 mm to 2.36 mm as B, and (A / B) is a ratio of 9/1 to 6/4. , (A + B) was 75% or more, and the medicine package 3 was filled to prepare a salt oil explosive package (amount 500 g × a diameter 50 mm) shown in FIG.
We evaluated the waist strength of the anti-maltite sachets with different hardness. The results are shown in Table 1.

The waist strength measurement will be described.
As shown in FIG. 2, about 1/3 of the longitudinal direction of the manufactured anti-maltite explosive sachet (dose 500 g × drug diameter 50 mm) 1 is placed on a table 10 and fixed with, for example, tape 11 and not fixed. The degree of bending due to the weight of the part is determined as the sag angle. The protractor 12 was placed at the fulcrum portion of the salt oil explosive pack 1 to perform measurement, and the comparison was made between the salt oil explosive pack 1 according to the present embodiment and the salt oil explosive pack according to Comparative Examples 1 to 4.

Table 1 shows waist strength data after 1 week and after 1 month of the salt oil explosive sachet 1 manufactured with different hardness (continuous level) as a comparison of hardness. Here, Comparative Example 1 has a hardness of 0.1% to 10%, Comparative Example 2 has a hardness of 5% to 10%, Comparative Example 3 has a hardness of 4% to 14%, and Comparative Example 4 has a hardness of 3% to 10%. 15%.
In Table 1, the waist strength was measured at each n = 3, and the average value was described.

From Table 1, when comparing the salt oil explosive bag 1 according to this embodiment and the salt oil explosive bag according to Comparative Examples 1 to 4, the hardness is 0.1 as in the salt oil explosive bag 1 according to this embodiment. By setting it to% to 3%, the sag angle is kept within a range of 8 ° to 12 ° (average 10 °) after one week and 8 ° to 17 ° (average 10 ° to 15 °) after one month. I was able to confirm. This confirmed that the waist strength could be greatly increased.
On the other hand, in the salt oil explosive sachets according to Comparative Examples 1 to 4, the sag angle was 11 ° to 28 ° after 1 week (average 15 ° to 25 °), and 18 ° to 28 ° after 1 month (average 20). It was confirmed that the degree of bending due to its own weight was large and the waist strength was not sufficient as compared with the ammonium nitrate explosive bag 1 according to the present embodiment.

Here, the clear reason for the sagging angle range due to the waist strength of the anti-maltite explosive sachet is described.
At an actual blasting site, the ammonium nitrate explosive pack 1 is basically used in a side hole as shown in FIG. 3, for example. The salt oil explosive pack 1 is loaded by a loading rod (wood, etc.) 8. Therefore, when the waist is weak, when the hole 6 is loaded or clogged with the obstacle (projection) 7 at the tip, the diameter of the hole 6 (φ65 mm to φ75 mm) and the diameter of the anti-nitrate explosive packet 1 (φ50 mm) )), The ammonium nitrate explosive sachet 1 bends and becomes difficult to load into a predetermined position. In addition, the frequency of occurrence such as very difficult to collect also when collecting the anti-maltite explosive pack 1 loaded at one end becomes high. For example, when using an explosive sachet with a diameter of 50 mm, the hole diameter is generally 65 mm to 75 mm.
Therefore, the above-mentioned phenomenon can be reduced when the salt oil explosive bag 1 according to the present embodiment is compared with the salt oil explosive bag embodiments according to Comparative Examples 1 to 4.

Next, the reason why the position of 1/3 of the salt oil explosive pack 1 is used as a starting point for determining the waist strength will be described.
In the case of the waist strength (buckling) test, the manufactured ammonium nitrate oil explosive sachet (dose 500 g × drug diameter 50 mm) 1 has a drug length of about 300 mm. In the test, as shown in FIG. 2, 1/3 of the longitudinal direction was placed on the table 10 and the bending angle due to the weight of the unfixed portion was measured with the protractor 12, but 1/2 or 1/4 of the longitudinal direction was measured. Also experimented with. However, when the relative comparison was made at 1/2, no significant difference appeared. In addition, in 1/4, the hip folding angle appears slightly larger than 1/3, but as a relative comparison, the data is almost unchanged as 1/3.

Next, a mechanism for increasing waist strength will be described.
Porous prill ammonium sulfate having a low hardness has a large pore volume in the ammonium nitrate, so that the particles are liable to collapse due to a large cavity inside the particles. Therefore, the present inventor has found that the hardness of the conventional porous prill ammonium sulfate is less than 8% to 10% and the powder prill ammonium nitrate having a hardness of 0.1% to 3% is used to suppress pulverization.
And, as for the relationship between waist strength and hardness as a sachet explosive sachet, if the hardness of porous prill ammonium is weak, it is easy to pulverize, and pulverization is promoted by friction between porous prill ammonium in vibrations such as transportation .
When the degree of pulverization increases as an anti-maltite explosive sachet, the waist strength maintained as granular cannot be maintained, and the waist strength is weakened.

  For example, as shown in FIG. 4A, what was initially maintained by the porous prill ammonium particles 2A is pulverized by transport vibration and friction between the porous prill ammonium particles 2A as shown in FIG. 4B. When the powdered product 2a of the porous prill ammonium nitrate particles 2A is clogged in the gaps between the porous prill ammonium nitrate particles 2A, the gaps as the ammonium nitrate oil explosive sachet 1 become large, and the waist strength becomes weak.

As described above, the strength of the porous prill ammonium nitrate can remarkably improve the waist strength of the ammonium nitrate oil explosive bag 1. In other words, the individual particles as the salt oil explosive explosive 2 are harder than the conventional salt oil explosive explosives, so that the particles are hard to break and the ratio of powdering becomes small, and the tension as a salt explosive explosive wrap is prolonged. It was confirmed that the waist strength could be maintained at the same time.
In addition, it was confirmed that the anti-saxe explosive sachet produced by adjusting the particle size with a salt-powder explosive using porous prill ammonium which has a high hardness and a large particle size can maintain a strong waist strength.

(Embodiment 2)
The ammonium nitrate explosive bag 1 according to this embodiment was manufactured in the same manner as in the first embodiment.
In Comparative Example 5, the particle diameter of the ammonium nitrate explosive explosive is 0.85 mm to 1.40 mm as A, 1.40 mm to 2.00 mm as B, and the ratio (A / B) is 9/1 to 6/4. The mixture was mixed so that (A + B) was 75% or more, filled in the medicine package 3, and manufactured in the same manner as the ammonium nitrate explosive package (dose 500 g × diameter 50 mm) 1 shown in FIG.

In the present embodiment, the salt oil explosive bag 1 according to the present embodiment and the salt oil explosive pack 1 according to the comparative example 5 were compared by a detonation performance test.
As shown in FIG. 5, the distance L between two anti-maltite explosive sachets (dose 500 g × dose 50 mm) 1 set in the center of the 65A steel pipe (inner diameter 68.0 mm, length 2.75 m) 15 is adjusted. However, the maximum value of the distance at which both sides completed the explosion (detonation distance L) was measured, and the detonation degree “L / explosive envelope diameter” was calculated and designated as explosive. In addition, slurry explosive (drug size 30 mm × drug amount 100 g) was used for the parent die 16 for the initiation. The results are shown in Table 2.

Here, the steel pipe explosion test will be described.
Usually, the explosion test is a sand explosion test according to JIS K 4810 and the pyrotechnic association standard ES-31 (1). However, the decommissioning reaction is unstable and the accurate performance evaluation is difficult in the place where the restraint conditions such as atmospheric pressure are sweet, and the detonation is stable at atmospheric pressure. Is said to have a drug diameter of 300 mm or more (larger for poorly reactive porous prill ammonium sulfate). However, since it is impossible to perform an experiment with this diameter, in this embodiment, a 65A steel pipe (inner diameter 68.0 mm, length 2.75 m) 15 is used to simulate actual drilling as a steel pipe explosion test. By doing so, the detonation reaction was stabilized and an accurate evaluation of the detonation test was made possible.
In the explosion test, each 3/3 explosion point maximum value was recorded.

In this embodiment, it was confirmed that by setting the hardness of the porous prill ammonium nitrate used for the ammonium oil explosive explosive to 0.1% to 3%, pulverization can be suppressed and waist strength can be maintained for a long time. .
On the other hand, in Comparative Example 5, the hardness of porous prill ammonium sulfate was 8% to 10%, so that the degree of powdering became large and it was difficult to maintain the waist strength for a long time.

In this embodiment, the one using 100% of the particle size 1.40 mm to 2.00 mm of the ammonium carbonate explosive explosive 2 has lower waist strength than that adjusted the mixing ratio of the particle size, so this embodiment is Comparative example shows that the mixing ratio (A / B) is improved in the range of 9/1 to 6/4 when A is 1.40 mm to 2.00 mm and B is 2.00 mm to 2.36 mm. This can be confirmed by comparing the mixing ratio (A / B) when the particle diameter of 0.85 mm to 1.40 mm in A is A and 1.40 mm to 2.00 m is B.
The detonation performance was the same as that of Comparative Example 5, and it was confirmed that the waist strength as an explosive package could be kept strong while maintaining the detonation performance.

It is sectional drawing which shows the salt oil explosive bag which concerns on this embodiment. It is explanatory drawing which shows a waist strength test. It is explanatory drawing which shows the loading condition of a salt oil explosive sachet. (A) Schematic diagram showing the original ammonium nitrate explosive package, (B) Schematic diagram showing the ammonium explosive envelope after transport. It is explanatory drawing which shows a detonation performance test.

Explanation of symbols

1 Membrane explosive pack 2 Membrane explosive pack 3 Pill pack 4 Heat seal 5 Aluminum clip

Claims (3)

An anti-nitric acid explosive sachet comprising a medicinal sachet filled with an anti-poisonous ammonium explosive having a hardness of 0.1% to 3% by the test method described below and an oil.
Hardness test method (Test method described on page 4 of the Industrial Pyrotechnics published by the Japan Industrial Explosives Association on July 15, 1965)
A sample 50 g (W ₁ ) collected by sieving to 10 mesh to 14 mesh is placed in a receiving pan and spread over the entire surface of the pan. Place a ground plate on the sample, lightly grab the handle and rotate it 5 times in 10 seconds. A sample is taken out, sieved with a 14-mesh sieve, and the pulverized product passing through the 14-mesh is collected and weighed (W ₂ ).
Hardness = W ₂ / W ₁ × 100 (%)
However, the weighing accuracy in W ₁ is 500 g = 0.5 In the ammonium nitrate explosive sachet according to claim 1,
When the particle size of the ammonium oil explosive explosive is 1.40 mm to 2.00 mm as A and 2.00 mm to 2.36 mm as B, (A + B) is 75% or more, preferably 80% or more, The ratio of (A / B) is in the range of 9/1 to 6/4. In the salt oil explosive sachet according to claim 1 or claim 2,
The sagging angle shown below is 8 ° to 12 ° after 1 week, and 8 ° to 17 ° after 1 month.
The sagging angle is fixed to 1/3 of the longitudinal direction of the salt oil explosive sachet when the amount of the powder sachet explosive sachet is 500 g × 50 mm in diameter, and the degree of bending depends on the weight of the unfixed part. Find as a corner.

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