Method of ore and rock breakage in development of solid mineral deposits

FIELD: mining.

SUBSTANCE: during performance of drilling and blasting works in the lower part of each explosive well a bottom charge is arranged, on the outer surface of which there is a circular cumulative groove arranged, the top of which lies in the horizontal plane, which separates the volume of the bottom charge in two and matches the plane of a working site of an open pit ledge or a bottom of an underground stope. The value of well subgrade drilling is accepted as equal to the half of the cumulative groove base width.

EFFECT: reduced drilling flow due to reduction of subgrade drilling and higher quality of arrangement of a working site of open pit ledges and a bottom of stopes at underground mining works.

2 dwg

 

The invention relates to mining and, in particular, to the open and underground mining of solid minerals.

There is a method of blasting ores and rocks, consisting in drilling and detonations well pereboom determined by well-known methods, but not exceeding 3-4 m [1]. The disadvantage of this method is the need for unnecessary consumption of drilling at least 15-20%, to ensure a fairly smooth working area of the next ledge, and overruns BB and significant disruption of the surface of the work platform, fixed with additional works at its layout.

The closest in technical essence is a way of blasting ores and rocks using boiler charges [2]. The disadvantage of this method is the high complexity, highly complex organization of work and high material costs on the formation of an additional volume of the charging chamber at the bottom of blastholes.

The aim of the invention is the reduction of General and specific volume of drilling and improving the quality of design work platform ledges quarry and the bottom of the treatment blocks in underground mining operations.

This goal is achieved by the fact that when carrying out blasting at the bottom of each vertical downward wells have Donne the first charge, on the external surface of which is formed an annular cumulative recess, the top of which lies in a horizontal plane dividing the volume of the bottom charge in half and coincident with the plane of the working surface of the ledge career or bottom groundwater treatment unit. When blasting each such charge in the blasting process is formed of a flat annular cumulative stream with a high concentration of energy, which, meeting with the same stream of shaped charges of the neighboring wells, forms a horizontal plane fracture of the array, passing through the vertex cumulative excavation and forming the working space of the next ledge career or flat bottom of the underground unit. The amount of perebor wells thus equal to half the width of the base of cumulative extraction.

The invention is illustrated by drawings, where figure 1 shows a General scheme of conducting blasting vertical downward wells. Figure 2 shows the location of the horizontal annular cumulative notches in the bottom charge and its parameters.

The way blasting ores and rocks in underground and open cast mining contains the thump of hands tonnes mined array 1, a vertical downward borehole 2, the bottom charge 3 with the outer surface 4, cumulative ring in the recess 5, the top 6 cumulative extraction, horizon is inuu plane 7, base 8 and a depth of 9 cumulative indentations, perebor 10.

The method is implemented as follows. The thump of hands the amount of the massif 1 amerivault vertical downward wells 2 using well-known methods for the determination of passport drilling (figure 1). In each hole 2 establish a pre-made base charge 3, which has on the outer surface of the battery 4 is formed an annular cumulative recess 5, a top 6 which lies in a horizontal plane 7, dividing the volume of the bottom charge in half 3 and coinciding with the plane of the working surface of the ledge career or bottom groundwater treatment unit. The amount of base 8 and a depth of 9 cumulative recess 5 is determined by known methods (figure 2). Thus perebor 10 for each well 2 is equal to half the value of the base 8 cumulative notches 5. After installation of the bottom charge 3 hole 2 is charged in a known manner using known EXPLOSIVES and blasting agents. After loading all wells produce 2 initiating, starting from the bottom of the battery 3, and blasting in accordance with the applied technology of blasting ores and rocks.

Sources of information taken into account

1. Trubetskoy, K.N., Krasnyansky GL, Cronin V.V., Kovalenko V.S. the quarries Design: a Tutorial. M.: Higher school, 2009. 694 S. (Str, RES; str-430).

2. Ibid (P.41 and 431).

The way blasting ores and rocks in the development of solid mineral deposits, including blasthole drilling, loading using conventional and shaped charges and blasting charges, characterized in that in order to reduce the flow of drilling by reducing perebor and improve the quality of blasting in the lower part of the vertical descending wells have a bottom charge on the outer surface of which is formed an annular cumulative recess, the top of which lies in a horizontal plane dividing the volume of the bottom charge in half and coincident with the plane of the working surface of the ledge career or bottom groundwater treatment unit, and the magnitude of perebor well take equal to half the width of the base of cumulative extraction.



 

Same patents:

FIELD: mining.

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3 tbl, 4 dwg

FIELD: blasting.

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1 tbl, 6 ex

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1 tbl, 12 ex

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Suspended well stem // 2419063

FIELD: mining.

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3 dwg

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2 cl, 1 tbl

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3 dwg

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EFFECT: increased reliability and capacity.

57 cl, 30 dwg

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