Charging method of emulsion explosive compounds

FIELD: explosives.

SUBSTANCE: method provides for delivery of emulsion explosive by means of pump to charging hose and during transportation via the latter of components of emulsion explosive components the supply to annular gap between the hose wall and the flow of water composition with surface-active substance. Alkyl benzene sulphonate (NP-1 sulphanole) or alkyl sulphate of secondary alcohol (penta-surface active substances) in quantity of 0.05-0.1% is used as surface active substance.

EFFECT: introduction of surface active substances allows reducing inter-phase surface tension between emulsion explosives and wall of charging hose, which considerably reduces the pressure during the charging process and excludes the break of the charging hose.

2 cl, 1 tbl

 

The present invention relates to a method of loading of emulsion explosive compositions used in mining types of blasting.

Currently, the developed emulsion compositions of various types and areas of application, including for underground blasting. Common features of all of emulsion explosives and methods of their preparation are cooking at a high temperature and mechanical stirring of the aqueous phase from a solution of salts, oxidizers and flammable hydrocarbon phase containing the additive surfactant, called an emulsifier, as an individual substance or a complex composition of several components. Resulting from this procedure, the mass is called the "matrix emulsion", suggesting the possibility of adding other ingredients, such as an aqueous solution of chemical reagents for sensitization gas, or solid porous particles, microspheres, or energy fuel from metal powders and / or granules of ammonium nitrate. All components are mainly added in the process of loading special mixing-charging machines. As examples of the above emulsion explosives can cause RF patents №2123488, No. 1783759. Data of emulsion explosives manufactured in mixing-charging machines on plug units quarries, usually sensibiliser water R is the target of the sodium nitrite concentration of 5÷30%, dispersive it using static or dynamic mixers, mounted together with other units on the chassis charging machines. In the loading process it is necessary to transport the emulsion explosive over relatively large distances (several tens of meters) to wells or bore-holes on the charging hose, the diameter of which is up to 25 mm. of Course, that the hose due to the high viscosity of emulsion explosives develops high pressure, which can lead to rupture of the charging hose with traumatic consequences for staff. Often, to reduce the pressure in the charging hoses, through a special device to supply water. However, for some types of mixed emulsion explosives and especially with pellets these measures prove to be insufficient. For example, a device for loading on the patent of the Russian Federation 2312301 and device for mixing and loading wells mixed emulsion explosive according to the patent 2163344, which reduce the internal resistance in the hose by filing under pressure of clean water in the annular stream between the wall of the charging hose and the flow of the emulsion composition.

However, when the loading occurs a partial mixing of the flow of emulsion explosives and water, which progresses through the hose resistance increases and, as a consequence, there is growing pressure in it that may cause it to rupture.

The most the e closest to the claimed invention is a method of loading wells of emulsion explosives in the patent of the Russian Federation 1457501, where mixing of the components of the mixture of emulsion explosives occurs after exiting the pump immediately before charging the line in the mixer and is carried out by dividing the flow CENTURIES many jets pins along a helical line and water are separately fed through the ring in the charging hose.

The technical objective of the proposed solutions is to improve the method of loading the emulsion explosive discharge for charging hoses, namely, that applies the technique of reducing the interfacial surface tension between the emulsion explosive and wall charger hose, which significantly reduces the pressure loading.

The implementation of this task is achieved by the fact that the water in the mixing-charging machine, which is served in the charging hose is injected surfactant. It is known that the greatest influence on the formation of a hydrophilic surface of any pipeline have only a water-soluble surfactant. Influence of surfactants on selective wetting was being investigated substances, which was widely spread in the industry. Of the anionic surfactants were investigated: alkylbenzene-sulfonates - sulfonic acid NP-1 and NP sulfonic acid, 3-alkyl sulphates and secondary alcohols containing 32% of the active substance disodium salt alkanesulphonic acid (BPS). The selected reagents was determined by the surface tension of the water races the thief on the border of the emulsion and the charging hose. Surface activity of a substance is determined by its chemical structure and its state of aggregation in solution. For example, it is known that surfactants, in which the hydrocarbon radicals are branched structure, are the best wetting, representative of which is alkylaryl-sulfonate, based on the propylene tetramer (sulfonic acid NP-1). The magnitude of the kinetic wetting, characterizing the rate of adsorption of the surfactant on the phase boundary is determined by the time of loading the standard sample hydrophobic carbon powder from the surface of the surfactant solution in the liquid volume. The lower the value of the kinetic wetting, the higher the rate of adsorption of surfactants at the border section of the phases and the greater surface activity has reagent. The highest surface activity have aqueous solutions of block copolymers of ethylene oxide and propylene (disolved, proxanol is chosen, prokimen), sulfonal and secondary alkyl sulphates alcohols (Potapov). Of the investigated surfactants best performance results were obtained with the introduction of sulfonic acid in water (TU 6-01-1612839-90), Potapova-430 (TU 2481-019-40245042-01).

Comparative results of the impact assessment of the amount of surfactant additives in the water pressure in the charging hose of the prototype and the present invention are shown in the table.

The amount of additive in water %The length of the charging hose, mPressure when charging, ATM
Without the addition of surfactants104,1
208,2
3014,6
50gap
The sulfonic acid0,01103,4
NP-10,01206,9
0,013012,1
0,0150Gap
0,05102,5
0,05205,6
0,05309,4
0,055014,3
0,1101,9
0,1204,2
0,1307,6
0,150the 10.1
0,2101,8
0,2204,3
0,2306,8
0,250the 9.7
Potapov-4300,01103,2
0,01206,5
0,013011,3
50Gap
0,05102,2
0,05205,1
0,05308,6
0,055013,5
0,1101,6
0,120a 3.9
0,1307,6
0,1509,2
0,2101,4
0,220the 3.8
0,2306,9
0,250 9,1

The proposed method loader provides the operational characteristics of emulsion explosives at the level of the prototype method, but significantly reduces the pressure in the charging hose. From the table it follows that the use of surfactant type, sulfonic acid, Potapova allows to reduce pressure when charged emulsion compositions and to eliminate the gap of the charging hose. The amount of surfactant should be in the range of 0.05-0.1%.

1. The method of loading of emulsion explosive compositions, including the injection pump mass composition in the charging hose with the water flow in the annular gap between the wall of the hose and the flow of composition, characterized in that water is injected surfactant.

2. The method loader emulsion explosive composition according to claim 1, characterized in that as the surfactant used Las or alkylsulfate secondary alcohol in a quantity of 0.05-0.1%.



 

Same patents:

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Spacer tamping bar // 2285899

FIELD: drilling and blasting operations in hard rocks, applicable in various branches using blasting, operations in hard rock masses.

SUBSTANCE: the spacer tamping bar represents a split cylinder with at least three longitudinal slots and a tapered expansion of the cavity down from the bottom, which is connected to the supporting ring through a spacer tube. A hollow spacer plug is inserted in the split cylinder from the bottom, it consists of tapered and cylindrical parts with at least three longitudinal slots, provided with a tubular haulage with a thread on the upper end, freely passing through the holes in the cylinder and supporting ring.

EFFECT: provided locking of blast products in the charge cavity before destruction of products in the charge cavity before destruction of the mass, enhanced efficiency of use of the blast energy for crushing of the rock.

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Spacer tamping bar // 2285900

FIELD: drilling and blasting operation in hard rocks, applicable in various branches using blasting operations in hard rock masses.

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4 dwg

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