JPS60103094A - Ammonium nitrate oil explosive resistant to high temperature sulfide ore - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention is an ammonium nitrate oil explosive (hereinafter referred to as ANFO explosive)
In particular, the present invention relates to an ANFO explosive suitable for use in mines producing high-temperature sulfide ores.

ANFO explosives have traditionally been widely used as cheap and safe explosives. However, in mines that produce high-temperature sulfide ores, there is a problem in that the naked ANFO explosive loaded in the blast hole emits smoke during preparation for blasting, creating a risk of explosion.

The reason for this is that in high-temperature sulfide ore mines where the rock temperature is said to be approximately 110°C to 140°C, when the ANFO explosive comes into contact with the high-temperature sulfide ore, the ammonium nitrate in the ANF (l) chemical reaction occurs with the iron sulfide. This is because the reaction is accelerated, especially in the presence of acidic water.

It is known that each of these is individually blended into ANFO explosives. However, the effect of such a reaction inhibitor differs depending on the type of ore, and moreover, a large amount of the reaction inhibitor is required. As a result, there was a problem that the power and sensitivity of ANFO detonation decreased, specifically, the detonation speed decreased and the detonating ability of the detonator decreased. In addition, the poly(π) addition of urea 11 increases the water solubility of ANFO explosives, which reduces the water resistance during water spraying at the face, and the ANFO explosives.
There was a problem in that FO explosives tend to solidify during long-term storage in proportion to the amount of urea added. In addition, the addition of large amounts of calcium carbonate not only harms the environment due to ammonia odor, but also causes direct damage to AN.
It has a significant effect on reducing the power and sensitivity of FO explosives. Because of these problems, the amount of these reaction inhibitors added is limited to about 2% by weight, and as a result, the smoke suppression time (smoke waiting time) of ANFO explosives is several hours to more than 10 hours at most, and it is about 24% by weight. It was not possible to obtain a smoke suppression time (which may occur due to contact between unexploded ANFO mulberry and sulfide ore).

As mentioned above, the present invention can be used in combination with a specific reaction inhibitor among the conventionally known reaction inhibitors, which cannot be put to practical use due to various problems when blended alone. The present invention was completed based on the discovery that the above problems do not occur, and the present invention provides an ANFO explosive that can withstand high-temperature sulfide ores without deteriorating its practical properties.

That is, the present invention provides an AN containing ammonium nitrate (hereinafter referred to as ammonium nitrate) and a fuel oil such as light oil or kerosene,
The FO explosive contains 0.5 to 3% by weight of urea and 0.5 to 3% by weight of calcium carbonate, and the total blending ratio of urea and calcium carbonate is 2.5 to 4 MiA0
% is mainly composed of gold, but it also includes those containing non-flame sensitizers.

The urea and charcoal 1jλ calcium used in the present invention may be industrial products, and the particle size is not particularly limited, but it is preferable that they pass through 24 meshes. :t/r
-, the blending ratio is 0.5% of urea to 8% of NFO
~3% by weight, calcium carbonate is 0.5~3% by weight, and the total blending ratio is 2.5~4% by weight, and a sufficient smoke suppression effect can be obtained if it is less than this range. Moreover, if the amount exceeds this range, it is not preferable because it causes problems with conventional glue and soil as described above.

In the present invention, urine JA and calcium carbonate may be blended into the ANFO explosive using any mixing method and moisture order as long as they are blended uniformly.

The ANFO explosive of the present invention obtained in this way has an excellent smoke suppression time of 24 hours or more, and is superior to conventional products in terms of water resistance and ammonia odor generation, which are problems in practical use, and has excellent detonation speed and detonation. There is almost no decrease in sex, so
It can be safely used in the harsh environment of high-temperature sulfide ore mines.

Next, the effects of the single blade of the present invention will be specifically explained using all examples and comparative examples.

Examples 1 to 7 ANFO explosives of the present invention were obtained by adding reaction inhibitors as shown in Table 1 to an ANFO explosive composition consisting of a glass fork (page 94) and 6 parts by weight of light oil. Various sexualization tests were conducted. The results were as shown in Table 1.

[The secret to smoke suppression time (smoke waiting time)]

30 parts of ANFO explosive, 70 parts by weight of ore (sulfide ore or clayey sulfide ore dissemination zone), and mineral water (P 2.6) 5
100 pieces of sample obtained by uniformly mixing the amount of melon
I11+++1 Filled in a 400m long iron pipe and heated to 140℃
The sample was heated in a constant temperature bath and the time until it started smoking was measured.

[Elution amount test]

200 y of ANFO explosives were filled into an iron pipe with a diameter of 35 mm and a length of 400 yen.The iron tube was tilted 10 degrees from the horizontal and placed in a constant temperature chamber at 90°C and relative humidity of 100%.After 2 hours, the ANFO explosives were filled. The elution amount was measured. We investigated whether and how much ammonia odor was generated in the same sowing.

[Explosive speed test]

ANFO explosive 90 (MF) was packed into an iron pipe with a diameter of 35 and a length of 1 m, titamite (trade name of water-in-oil emulsion Baku-Shichikin made by NOF Corporation) xooy was used as a booster, and it was detonated using the Dautrich method. was measured.

[Detonator detonation test]

ANFO Explosive Engineer 207 with a diameter of 25 mm and a length of 30 mm (
Fill one iron pipe, detonate it with a No. 6 detonator, and explode.
We checked whether it was a non-explosion (marked with an "O") or a non-explosion (marked with an "x").

Comparative Examples 1 to 8 Using the same ANFO bomb composition as used in the examples, as shown in Table 1, an example in which no reaction inhibitor was added, and an example in which urea and calcium carbonate were added outside the scope of the present invention. Examples using reaction inhibitors other than the reaction inhibitor of the present invention were tested using the same test method as in the examples, and the results are shown in Table 1.
It was shown to.

As is clear from the results of the above examples and comparative examples,
Addition of a known reaction inhibitor alone avoids a reduction in smoke suppression time, but the desired smoke suppression time is too short and insufficient (Example 6.7 of Ratio 11). If the additives were added in combination outside the above range, the smoke suppression time was 20 hours or less, and various performances were also degraded, making it impossible to use in practical terms (Comparative Example 4.5). On the other hand, as in the present invention, urea and calcium carbonate are
′? i. By using the additive in a certain range of amounts, the smoke generation suppression time was completely increased to 24 hours or more, and the fogging performance and other various performances were able to be sufficiently reduced to a practical range.

Patent Applicant: L Hon Yushi Co., Ltd.

Claims (1)

[Claims] An ammonium nitrate oil explosive whose main components are ammonium nitrate and fuel oil, which contains 0.5 to 3% by weight of urea and 0.5 to 3% by weight of calcium carbonate, and the total blending ratio of urea and calcium carbonate is 2. Eight ammonium nitrate oil preparations characterized by having a concentration of .5 to 4% by weight.