Method for formation of deep-hole charge

FIELD: mining industry, applicable in opencast mining of mineral resources and hydraulic engineering.

SUBSTANCE: the method for formation of a deep-hole charge of a multi-component mixed explosive consists in impregnation of porous and crystal ammonium nitrate with liquid petroleum product and placement of the obtained explosive in the hole, formation of the mentioned deep-hole charge in its extension is accomplished with sections of various density of the explosive depending the physico-mechanical properties of the rocks located in the length of the hole, varying the density of the explosive by varying the mass percent relation of the quantity of granules of porous and crystal ammonium nitrate in the explosive compound, the mass percent of a granule of porous ammonium nitrate is within 54.5 to 71.5, a granule of crystal ammonium nitrate is within 20 to 40, liquid petroleum product - within 5.5 to 8.5, the granules of porous ammonium nitrate are used with sizes of 2.5 to 4.5 mm, and those of crystal ammonium nitrate - 0.7 to 1.3 mm, mineral oil is used as petroleum product.

EFFECT: provided optimized destruction of the rock in opencast mining of mineral resources and in building blasting operations.

3 cl

 

The invention relates to the mining industry and can be used in the open-air mining and engineering.

A known method of regulating the density and volumetric energy density of borehole charges of slurry explosives (BBB) by aeration during mixing of the supply air or the introduction of chemicals, thus stabilizing the distribution of air or gas in the form of tiny bubbles reach a preliminary transformation of the liquid phase BBB in the gel due to its density and structure (see RF patent №2097680, M CL F 42 D 3/04, published. 27.11.97).

The disadvantage of this method is that the output of the mixer to receive the downhole charge one fixed density, which when placed in the hole evenly changes its density from the wellhead to the bottom depending on the pressure generated along the length of the charge weight of the column charge, the height of the water column above the charge, length and volume weight of the material, tamping and other factors. While most dense charge with high volumetric energy density is formed at the borehole bottom, and towards the mouth its density is uniformly reduced, which makes it impossible to form the charges required along their length density and volume concentration. In addition, the gel CENTURIES who have a large critical diameter of the open charge therefore they are not suitable for use in cases when you need to regulate the volume concentration of the energy of the explosion.

The closest in technical essence is a method of forming a downhole charge of the multi-component composite EXPLOSIVES containing a mixture of ammonium nitrate with liquid non-explosive combustible substance, which consists in impregnating granules of ammonium nitrate liquid petroleum product and placing the resulting multi-component composite EXPLOSIVES in a borehole (see RF patent №2076304, M CL F 42 D 3/04, published. 27.03.97).

The invention is directed to solving the problem of creating a method of forming a downhole explosive charge with different densities along the length of the charge. While this method must be implemented directly by mechanical loading wells.

The technical result that can be obtained from the use of the invention is to reduce the unproductive consumption CENTURIES due to the formation of charge required along its length density and volume concentration in mechanized charging wells.

The claimed technical result is achieved due to the fact that carry out the method which consists in forming a borehole charge of the multi-component composite EXPLOSIVES. Specified CENTURIES contains a mixture of ammonium nitrate with nonexplosive liquid fuel in the society, which impregnate the granules of ammonium nitrate. Next, the resulting multi-component composite EXPLOSIVES placed in the borehole, and borehole charge along its length is formed with areas of different density CENTURIES depending on the physico-mechanical properties of rocks located along the borehole. Density CENTURIES change by changing the mass percentage of the number of porous and crystalline ammonium nitrate per unit volume of explosive, which consists of these components taken in the following ratios, wt%:

granules of porous ammonium nitrate 54,5-71,5

granules of crystalline ammonium nitrate 20-40

liquid petroleum 5,5-8,5

In addition, the fact that the formation of charge use of porous ammonium nitrate with a grain size of 2.5-4.5 mm and crystalline ammonium nitrate with a grain size of 0.7 to 1.3 mm

In addition, the fact that the formation of charge as a liquid oil product use mineral oil.

This set included the essential features, each of which are necessary and together sufficient for obtaining the claimed technical result.

The technical essence of the method is based on a different mechanism of destruction of rocks depending on their physico-mechanical characteristics. So, in fragile environments, features resouses high elastic constant, the most useful application of EXPLOSIVES with high initial pressure, detonation speed and density.

The relationship between the numerical value of the initial pressure CENTURIES and acoustic stiffness of the rock can be determined from experimentally installed dependencies:

Pn=(0,126ξCp-1,7·104)

where Rn- the value of the initial pressure of the gaseous products of the explosion in kgf/cm2;

ξ is the density of species in kg/m3;

Withp- the speed of longitudinal waves in m/s.

Hence determine the numerical value of the velocity of detonation of EXPLOSIVES:

where ω - velocity of detonation of EXPLOSIVES in m/s;

ξCC- density CENTURIES kg/m3.

And the required density CENTURIES at a known velocity of detonation:

Thus, knowing the density of EXPLOSIVES to destroy a specific rocks, it is possible to make multi-component CENTURIES of components of different densities, taking these components in different proportions. Thus, by changing the density of CC, you can adjust the speed of the detonation.

According to the present method is proposed to change the density of multicomponent CENTURIES, made on the basis of porous ammonium nitrate by including it as a solid dispersion additives Krista is symbolic of ammonium nitrate. Changing in ready CENTURIES percentage denser crystalline ammonium nitrate, regulate the density of CENTURIES.

Granules of crystalline ammonium nitrate, distributed in the BB and impregnated with liquid fuel, perform the role of sensitizer, because, despite several high content of liquid fuel in the charge granules of crystalline ammonium nitrate absorbs fuel in insufficient quantity. Thus, porous ammonium nitrate performs in the role of charge phlegmatizer, and crystal - sensitizer. As liquid petroleum product used mainly mineral oil. The best results in some cases, the benefits of using waste engine oil.

The density of the mixture aminoi nitrate explosive charge can vary from 0,754 g/cm3to 0,805 g/cm3.

The method is as follows. At site A, is equal to 1.2 m along the borehole depending on the physico-mechanical properties of rocks of this area, which define the known devices, define the required density CENTURIES, or by calculation using the above formula, or through appropriate experimentation. To obtain the necessary explosive density, equal 0,754 g/cm3determine the content of the crystalline nitrate in the amount of 20 wt.%and porous nitrate in amounts to 71.5 wt.%. For site B, is equal to 5 meters, to obtain the necessary explosive density, equal to 0.78 g/cm3you must provide content in CENTURIES crystalline ammonium nitrate in the amount of 34 wt.% and porous ammonium nitrate in the amount of 60 wt.%. The remaining 3.8 m 10 m borehole charge EXPLOSIVES density 0,805 g/cm3when the maximum number of granules of crystalline ammonium nitrate in the explosive composition, equal to 40 wt.%.

For this you can use a mixing machine, such as CUZN-2 with two sections for porous and crystalline nitrate and capacity for used liquid oil product. Partition components through the dispenser are fed into the mixer. In this mixer serves a liquid petroleum product in the required settlement amount. Supply of EXPLOSIVES in a borehole are also carried out through the dispenser. Thus, the hole charge the BB, which has a different density on the well depth, depending on the properties of destructible rocks.

1. Method of forming a downhole charge of multicomponent mixed explosives (he), which consists in impregnating porous and crystalline ammonium nitrate liquid petroleum product and placing the resulting specified CENTURIES in the borehole, characterized in that the formation of this borehole charge along its length is performed with the different areas is th explosive density depending on the physico-mechanical properties of rocks, located along the borehole, changing the density CENTURIES by changing the mass percentage of the number of porous and crystalline ammonium nitrate in EXPLOSIVES composition, wt.%: granules of porous ammonium nitrate -54,5-71,5; granules of crystalline ammonium nitrate - 20-40; liquid petroleum - 5,5-8,5.

2. The method according to claim 1, characterized in that the porous granules of ammonium nitrate used with dimensions of 2.5-4.5 mm, and crystalline nitrate - 0,7-1,3 mm

3. The method according to claim 1, characterized in that a liquid oil product use mineral oil.



 

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