The method of preparation watered kimberlite pipes to underground mining in areas with cold climate

 

(57) Abstract:

The method relates to the mining industry and can be used in underground mining of kimberlite pipes in areas with cold climates, such as the Yakut diamond deposits. The method includes the erection of waterproof pillar in the form of artificially frozen rocks by drilling of wells, installation of pipes freezing circuit, passes through the pipes of the refrigerant from the cooling circuit during the period of low temperatures on the surface. Around kimberlite pipes, the main and auxiliary mine shafts along a helical line in descending order are held for the production of drilling freezing circuit, grouped by sections. Each section through the surface of the well is connected to the refrigerant circuit on the surface. The beginning of the revolution have in permafrost over the thickness of the rocks of the aquifer. The sinking of the underlying coil is carried out in frozen rocks of production overlying coils. The method allows to increase the efficiency of the preparation for the development of irrigated kimberlite pipes by freezing aquifer thickness is Ozernoe mining of kimberlite pipes in areas with cold climate, for example, the Yakut diamond fields.

There is a method of mining under water bodies, including the construction of waterproof pillar in the form of artificial frozen rocks by drilling of wells, installation of pipes freezing contour of the heat exchanger and passing through the pipes of the refrigerant from the cooling circuit, the extraction of ore under the protection of the built pillar (see, for example, Tropak N. G. Special methods for mining. M: Whiteheat, 1951, S. 369-370).

The disadvantage of this method is the most labor-and energy on creating a pillar.

The closest analogue to the technical essence is "the Way of the development of mineral deposits under water bodies (see, for example, patent of Russia No. 2059814, E 21 C 41/16, bull.13, 1996).

Before mining operations are subject to the recess of the mine, under the river, protect waterproof as a whole, in the form of artificially frozen rocks. They are developing and drilling of wells, in which is mounted a pipe for passage of the refrigerant of the freezing circuit heat exchanger, and on the surface of the pillar ustanavlivaetsya due to the temperature difference in the contours.

The disadvantage of this method is the inability to freeze aquifer strata of rocks, intersecting kimberlite pipe under the permafrost rocks.

Natural technical object of the present invention is freezing aquifer strata of rocks, intersecting kimberlite pipe under the permafrost.

The problem is solved as follows. Around the kimberlite pipes of the main and auxiliary shafts along a helical line in descending order are held for the production of drilling freezing circuit, grouped into sections, and each section through the surface of the wells connected to the refrigerant circuit on the surface, and the coil is placed in the zone of permafrost over the thickness of the rocks of the aquifer, and the driving of the underlying coils carried out under the protection of the freezing of the rock mass produced from the generation of the overlying loop.

Significant differences of the proposed technical regime are:

around kimberlite pipes, the main and auxiliary mine shafts along a helical line in descending the="ptx2">

This solution allows for minimal length production to ensure the approach to watered rocks. Currently established and widely used mining machines, which in sedimentary rocks (fortress to 8 on a scale of Professor M. M. Protodiakonov) can take up to 10 km per month. The presence of the object of this tunnel system allows you to provide any required front for drilling freezing circuit.

Step helix generation define the technical capabilities for drilling wells, as well as with due consideration of technical equipment for the installation and operation of freezing columns.

The main and auxiliary mine shafts fitted within the ring of artificially zamorojennih rocks, it then decreases operating costs. With the beginning of round production combined with the main shaft, and the end of revolution generation after performing turn around kimberlite pipes connected with the auxiliary shaft barrel.

For ventilation and emergency exit when driving a new round of production intervals produce the linkage of the wells increased diameter with vyrabotki the us their length and direction determine thermophysical calculations so that for the period with negative temperatures on the surface of a frozen array in rocks with the formation of artificially waterproof pillar, structurally specified size. Mounted in the wells of freezing columns to aggregate (combine) in sections simultaneously temperature effects on the array. The number of merged columns in sections determine thermophysical calculation.

Each section through the surface of the wells connected to the refrigerant circuit on the surface.

This technical solution provides for the freezing of the array at a certain thermophysical calculation of the length of screw production, where the set of wells section. Through wells drilled from the surface at the beginning and the end sections are combined outer cooling circuit made heat sinks, and internal freezing circuit made freezing speakers mounted in the wells drilled in the rock aquifer thickness of coil output. The distance between the wells drilled from the surface, is determined by calculation on the possibility of filing Oh the columns section.

The beginning of the revolution have in permafrost over the thickness of the rocks of the aquifer.

This solution allows the driving of the first round to make from an array of permafrost, which reduces the complexity of the organization of freezing technology of the array.

The technical solution provided part of the first round lead generation leading artificial freezing of the bottom output of the known technical solutions, but this option is provided as an emergency due to poor documentation obtained during the study of the Deposit.

The sinking of the underlying coil is carried out in a frozen rock mass produced from the generation of the overlying loop.

The solution provides the driving of production in advance of frozen rocks, which will provide high performance with sinking.

At the same time possible quality control freezing array on the highway passable production from the end of the previous round, which also increases the speed of advance of the face.

Around kimberlite pipes, main and vspomogateljnye path.

In wells mount freezing columns that join the sections. Each section of freezing columns by means of two wells connected to a cooling circuit located on the surface. The beginning of the revolution generation feature in permafrost over the thickness of the rocks of the aquifer, and the driving of each lower coil is carried out in artificially frozen rock mass produced from the generation of the overlying loop.

An example of performing the method of preparation watered kimberlite pipes to underground mining in areas with cold climates shown in Fig.1, 2, 3, where

in Fig.1 is a schematic diagram of the method of preparation watered kimberlite pipes to underground mining in areas with cold climate - projection on a vertical plane;

in Fig. 2 - scheme of grouping sections of freezing contour along the length of the coil framing;

in Fig.3 is a diagram of the formation of artificial nevrogennogo pillar of generation, passed along a helical line in descending order.

Kimberlite pipe 1 (Fig.1) intersects the column 2 aquifer rocks under area 3 of the permafrost. Warnasooriya 7 shafts. The barrels 6 and 7 are outside the zone of displacement 8 from mining operations during the mining of lower underground horizon.

Above an aquifer 2 in the zone of permafrost 3 from the main stem 6 start driving along the helical line in descending order of generation 9 (Fig.1, 2). From the production of 9 drilling the sets of wells 10 for mounting them in freezing columns made known technical solutions (column not shown). The number of wells, their length, the distance between them, the spatial location in the array determine thermophysical calculations so that, when the surface of the negative temperature, numerosity waterproof pillar 11 and the dimensions it would have been such, that the accumulated cold persisted in the summer.

Installed in wells 10 freezing columns are combined into sections distributed along the length of the production of 9.

Each section of freezing columns pipeline, mounted on two wells 12, drilled from the surface (surface of the well 12), are connected by a heat exchanger 13 in the form of a system of radiators.

The pipeline system by the heat exchanger 13, pipelines in shallow wells 12, battery, speaker, buzzer the tour fill fluid coolant for example freon. The movement of the coolant through the freezing circuit is carried out forcibly by means of pumps (not shown) or due to the temperature difference in freezing pipes located in the rock mass, and the heat sinks 13 installed on the surface.

The distance between the surface of the wells 12 determine thermophysical calculations and economic considerations.

The following stage production 14 (Fig.3) are in the frozen zone 11, obtained through wells 10 with freezing columns from generation 9.

The thickness of artificially nevrogennogo waterproof pillar is determined by calculation and control during the drilling of the set of wells of the following round production 14.

Step screw generation 9 (the vertical distance from the production of 9 to generate 14) determine the technical capabilities of freezing columns and drilling equipment, as well as for economic reasons. Step screw production can change as it is sinking.

An example of performing the method of preparation watered kimberlite pipes to underground processing in areas with cold climate.

Beyond the zone rock the trunks of the known methods of stopping leaks with sinking water-saturated thickness of 2 rocks.

From the main shaft 6 in zone 3 of permafrost above the aquifer thickness 2 start driving along the helical line in descending order of production of 9 around kimberlite pipes 1 and the main and auxiliary mine shafts 6, 7. On the surface above the track, which will host the production of 9, mounted radiators 13 cooling loop.

With the surface drilling of wells 12 for piping from cooling radiators up to freezing circuit (column). The distance between the wells is equal to the length of the section of the kit that combines simultaneous freezing columns.

Produce piping section of the cooling and freezing of the contours. Assemble the necessary shut-off apparatus and equipment for monitoring temperature in a mountain array and, if necessary, a pump to move the coolant through pipelines and automatic control freezing complex.

From the production of 9 drilling the sets of wells 10 and mounted them in the cooling column. Fill a piping system sections, a liquid coolant, such as freon.

In the period of low temperatures on the surface include in Zamora the e column in the wells 10. The direction of the coolant is shown by arrows in Fig.2. There is the freezing array 11 and the cold accumulation. The movement of the coolant through pipelines is due to the temperature difference in heat sinks and freezing pipes or force pumps.

The dimensions of the artificial nevrogennogo waterproof pillar and accumulated in it cold during the winter period should provide (on thermophysical calculations) reliable operation in the summer, when the freezing complex off.

In artificially frozen array are drifting downstream coil framing 14. Quality control freezing is carried out at the drilling sets of wells of the openings 9 and 14.

Long cold winter in Yakutia, where the kimberlite deposits, allows you to store in the array rather cold for a short summer, save water resistant artificially nevrogennogo pillar.

The method of preparation watered kimberlite pipes to underground mining in areas with cold climates, which includes the construction of waterproof pillar in the form of artificially frozen rock by drilling with the paths in the period of low temperatures on the surface, characterized in that around the kimberlite pipes, the main and auxiliary mine shafts along a helical line in descending order are held for the production of drilling freezing circuit, grouped into sections, and each section through the surface of the wells connected to the refrigerant circuit on the surface, and the coil is placed in the zone of permafrost over the thickness of the rocks of the aquifer, and the driving of the underlying coil is carried out in frozen rocks of production overlying coils.

 

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