SU1395839A1 - Dust suppression arrangement for blast holes - Google Patents

Abstract

This invention relates to the mining industry. The purpose of the invention is to increase the efficiency of pressure reduction due to the production of foam when a charge of explosives is exploded and interacting with dust particles. The device contains an elastic waterproof sheath 1 filled with water 2 placed in a well above the explosive charge. The sheath 1 has a tip 3 installed above the well bore, made of an elastic-elastic material, having nozzles 4 and filled with a foaming agent solution. The cap 3 is connected via diaphragm 5 to bore 6 and non-return valve 7 with casing 1. Valve 7 closes bore 6, foam is emitted into the atmosphere through nozzles 4 due to the elasticity of the compressing cap 3. This ensures the suppression of dust that coagulates on the surface foam. Diaphragm 5 prevents the tip 3 from collapsing. After the tip 3 is dropped onto the blasted rock, the foaming reaction continues, and the foam continues to bind the debris. 3 il. (L oo co 00 00 co Stock ph.1

Description

The invention relates to mining compaction and can be used for pressure suppression and as an internal stemming in the blasting of wells, mainly for loosening and breaking the rock mass in open pit mining.

The purpose of the invention is to increase the efficiency of pressure reduction due to the production of Q foam in the explosion of explosive charge in a well and the interaction of foam aerosol with dust particles.

FIG. 1 shows a device for pressure suppression when wells are fired in the initial position before the explosion; in fig. 2 - the same, at the initial moment vzresha; in fig. 3 - then, with the explosion.

The device consists of an elastic waterproof sheath 1, which is a non-woven skin, for example, from polyethylene, in the upper part of the side wall of which

valve or plug is mounted 2. Dia

shell meter is equal to or more

greater than the diameter of the well. The cap with a cavity filled with a foaming agent solution is made of an elastic material, such as rubber, and is equipped with nozzles 4 and a diaphragm 5 with a hole 6 that is blocked by a check valve 7 ..

The preparation of the devices is carried out in the following order.

At the wellhead, charged with an explosive (IV), is used. The shell 1 filled with the tip 3, which through the valve 2 is filled with water, at the same time ensures the tightness of the shell against the walls of the well. The water in the casing performs the function of tamping and is a component during foaming.

The device works as follows.

At the initial moment of vzrysh gaseous products, rushing to break through the well, compress the shell 1 (Fig. 2), while part of the water contained through the hole 6, overcoming the resistance of the check valve

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35

40

45

surface of the blasted array. At the last moment of destruction and shear of rocks (Fig. 3), the gases that have broken through the surface lift the head 3 upwards. At the same time, the check valve closes the opening 6 in the diaphragm and the foam is emitted into the atmosphere through the nozzle 4 due to the elasticity of the compressive tip, which provides dust suppression all over the entire thickness of the coagulated foam with foam. Destruction of the tip 3 is prevented by the diaphragm 5. After the tip is over the exploded rock, the foaming reaction continues with, and the foam continues to displace the surface, binding the precipitated dust particles

The efficiency of the suppression of dust is increased due to the fact that foam formation occurs at the time of the explosion and after it, and the mixing of the fluid particles is more intensive in their suspension and on the surface of the blasted massif, i.e. in the zone of the most intense center of the left hole and in its atmosphere, without wetting large pieces of exploded rock, the least amount of foaming is required, and the use of foam is directed directly at suppressing dust. In addition, there is a reduction in the time of the start of work on the excavation of pores after the production of mass explosions.

Form LA inventions

A pressure suppression device for boreholes, including a well-water-resistant elastic water-proofable casing with a valve that is sized in the well, which is designed to increase the efficiency of the pressure suppression due to foaming when exploding the explosive charge and interacting with the pressure parts , elastic in a donproof shell fitted with

7, displaced to widening; ICO-50 installed above the wellhead

Q

about

five

R

five

0

five

surface of the blasted array. At the last moment of destruction and displacement of rocks (Fig. 3), the gases that have broken to the surface raise the tip 3 upwards. In this case, the check valve 7 closes the opening 6 in the diaphragm 5, and the foam is emitted into the atmosphere through the nozzle 4 due to the elasticity of the compressive tip, which provides dust suppression throughout the entire thickness of the dust that has broken through to the surface and coagulated with foam. Destruction of the tip 3 is prevented by the diaphragm 5. After the tip is dropped onto the blasted rock, the foaming reaction continues, and the foam continues to be pushed to the surface, binding the precipitated dust particles

Increasing the efficiency of dust suppression occurs due to the fact that foaming occurs at the time of the explosion and after it, and coagulation of the pie-shaped particles is more intensive in their suspension and on the surface of the exploded array, i.e. in the zone of the most intense source of the dust gap and in its atmosphere, without wetting large pieces of blasted rock, therefore, the least amount of foaming is required, and the use of foam is aimed directly at suppressing dust. In addition, there is a reduction in the time until the start of work on excavation of rocks after the production of mass explosions.

Form LA inventions

A pressure suppression device for boreholes, including a highly charged water-filled explosive charge placed in a well, is an elastic waterproof sheath with a valve, characterized in that, in order to increase the pressure suppression efficiency by producing foam when the explosive charge is exploded and interacting with the fluid particles, it is water resistant the shell is supplied

The SIDE 3, where interacting with the foaming agent solution placed in it, forms a foam suppressant mixture in the form of foam, which initially fills the expanding head, creating pressure in it (at the moment of explosion), escapes into the atmosphere and enters on

head made of elastic elastic material with nozzles and filled with a solution of foaming

by means of diaphragm and non-return valve with elastic waterproof sheath.

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Claims (1)

Claim Dust suppression device for blast holes, including an elastic waterproof shell with a valve located in a well above the explosive charge, filled with water, characterized in that, in order to increase the efficiency of dust suppression due to the formation of foam during the explosion of the explosive charge and its interaction with dust particles, the waterproof the shell is equipped with a head mounted above the wellhead made of an elastic elastic material having nozzles and filled with a foaming agent solution, while the head connected to the diaphragm and check valve with an elastic waterproof shell. fi. 2 fi. 3