The method of development of permafrost deposits with the mined-out space

 

(57) Abstract:

The invention relates to the field of mining and can be used in underground mining in permafrost (permafrost) systems with the mined-out space during formation of the backfill array (artificial pillar). The inventive method for underground mining in permafrost deposits includes the formation of primary treatment workings, submission to the developed space filler, binder and cooled air, while in the developed space serves the refrigerant with the desired temperature determined by the formula tx= /, where is the thickness of the layer of frozen water artificial array, m; the time of freezing water layer, C; is the coefficient of convective heat transfer, W/(m2deg); - latent heat of crystallization of water, j/m3; K - coefficient taking into account the time water cooling to 0oAnd freezing of ice to steady state array; tx- the temperature of the refrigerant,oC. When, first served refrigerant, and then scatter the cooled water in the amount determined by the formula Min=Mn[(-txx- the initial temperature of the refrigerant (breed), grad. The invention provides high efficiency for underground mining in permafrost deposits at the expense of sustainable backfill array at the specified time, linking with the technology development of the permafrost, which allows to extract minerals, high-performance and highly mechanized systems with maximum rates of extraction from the subsoil. 1 C.p. f-crystals.

The invention relates to the field of mining and can be used in underground mining in permafrost (permafrost) systems with the mined-out space during formation of the backfill array (artificial pillar). More than 70% of the minerals of Russia are located in the permafrost zone, which has enormous reserves of coal, iron, precious and rare metals.

There is a method of constructing artificial pillars and backfill arrays in mining by underground way with the mined-out space (see instruction manual for the production of filling operations in the mines of Norilsk combine // Mintsvetmetom the USSR on the construction of artificial backfill array consisting of the construction of metal-filling complexes and the complexity of creating a backfill mixtures are stable to negative temperatures.

The closest technical solution is the technology field development with the formation of amorgianos rock bookmarks in the generated space (see Red S. N. Pilot testing amorgianos breed laying-out of space // non-ferrous metallurgy, 1985, 7, S. 13-15).

The disadvantage of this technical solution is that when forming the backfill array is not exposed to the freezing mechanism, which would allow to link the time of treatment works with the period of filling the array necessary strength. Therefore, when using high-performance equipment and a large volume of ore mining stowing behind the sewage treatment works.

The purpose of the invention is to control the formation of the backfill array, allowing high adaptability filling operations to effective technologies of underground mining.

During the field development systems with the mined-out space in the conditions the mining waste. In this case, form filling an array is necessary in rational mode, i.e. in the case where the thickness of the filling mass and the time required to set the desired strength, linked to the technology of wastewater treatment works and depending on thermophysical properties of water, refrigerants (air, waste rock dumps, tailings processing plants, etc.) and their initial temperatures.

This objective is achieved in that in the known method of forming artificial filling of the array, including the formation of primary treatment workings, submission to the developed space filler, binder and cooled air, first determine the value (magnitude) of the temperature of the refrigerant to obtain bookmarks necessary strength for technologically specified period of time according to the formula:

tx= to/ (1)

where is the thickness of the layer of frozen water artificial array, m;

the time of freezing of the water layer with;

is the coefficient of convective heat transfer, W/(m2deg);

- latent heat of crystallization of water, j/m3;

K - coefficient taking into account the time water cooling to 0oWith and ice freezing to ustoichivosti with respect to the following conditions apply: the end temperature of the backfill array (pillar) - not more than minus 4oC; ratio time-based water cooling to 0oWith and ice freezing to the steady state of the array K=1,2; the coefficient of convective heat transfer = 6-12 W/(m2deg); latent heat of crystallization of water = 0,33109J/m3; the coefficient of thermal diffusivity of water =0,13 m2/s, the thickness of a single layer of watero- not more than 0.2 m

In addition, this objective is achieved in that for the adopted restrictions on the basis of the law of conservation of energy, determine the limiting ratio between the mass of water and mass of refrigerant according to the formula:

< / BR>
where Mnweight refrigerant (crushed rock), kg;

Min- the mass of water, kg;

tin- initial water temperature, deg;

tx- the initial temperature of the refrigerant (breed), grad.

The method is as follows.

Consider the development of the Deposit chamber system comprising a primary sewage treatment works (camera, layer drifts), filling the primary workings laying, testing mezhdurebernyh pillars after dialing the backfill array of necessary strength. In the case of the formation of the ice pillar array created with the of ice (Laporte) array which is that freezing time is not dependent on the thickness of the ore body as the layer of water freezes at the same time, with a different area of the camera. In other words, the freezing time depends on the thickness of a single layer (ceteris paribus temperature refrigerants, water, mountain massif, etc.), but not from his area.

For example, testing of a horizontal layer is performed by means of drifts height of 2.2 m To ensure freezing for a technologically necessary period of time, for example, for 50 days, the temperature of the refrigerant (in accordance with the terms and formula 1) should be no more than minus 20oC. If for technical reasons it is necessary to shorten the freezing, for example up to 40 days. According to the conditions outlined above calculations in this case you must use a refrigerant with a temperature of minus 25oC. Thus, changing the parameters of a single layer of frozen water, the temperature of the refrigerant or freezing time, you can control the formation process of filling the array in accordance with the specific process requirements.

In the case of the use Laporte bookmarks as m in the above case. The peculiarity in this case is the following sequence of forming artificial array: first occiput crushed material from the waste material with a negative temperature in accordance with the formula 1, then at him dissipate the chilled water in an amount determined by the formula 2, above which these conditions creates an array with unequal strength. Therefore, the use of the obtained dependences provides a stable backfill array at the specified time, linking technology with the development of permafrost. This, ultimately, allows to extract minerals, high-performance and highly mechanized systems with maximum rates of extraction from the subsoil. The absolute condition that the above requirements apply to the extraction of valuable ores and precious metals.

1. Method of underground mining permafrost deposits, including the formation of primary treatment workings, submission to the developed space filler, binder and cooled air, characterized in that the developed space serves the refrigerant with the required temperature, OA, m;

the time of freezing of the water layer with;

is the coefficient of convective heat transfer, W/m2grad.;

- latent heat of crystallization of water, j/m3;

K - coefficient taking into account the time water cooling to 0oAnd freezing of ice to steady state array;

tx- the temperature of the refrigerant, oC.

2. The method according to p. 1, characterized in that the first serves the refrigerant, and then scatter the cooled water in the amount determined by the formula

< / BR>
where Mnweight refrigerant (crushed rock), kg;

Min- the mass of water, kg;

tin- initial water temperature, deg.;

tx- the initial temperature of the refrigerant (breed), grad.

 

Same patents:

The invention relates to the mining industry and can be used to eliminate mine shafts at operating enterprises

The invention relates to the mining and metallurgical industry, in particular to the disposal of tailings and hydrometallurgical processing of mineral resources in areas of natural occurrence and mining of these minerals, for example in underground mine workings
The invention relates to mining and can be used in underground mining for the construction of the supports for the protection of preparatory workings on the layers up to 1.2 m
The invention relates to the mining industry and can be used in underground mining with a mined-out space
The invention relates to the mining industry and can be used in underground mining with a mined-out space

The invention relates to the mining industry and can be used in the development of mineral deposits with a mined-out space

The invention relates to the mining industry and can be used in underground mining with a mined-out space

The invention relates to mining and can be used in mining at the mining enterprises, having in its composition concentrator and leading mining systems development with the mined-out space

The invention relates to the mining industry and can be used at the enterprises, having in its composition concentrator and leading mining systems development with the mined-out space

The invention relates to the field of mining and can be used in the development of fields in the conditions of permafrost (permafrost) systems with the mined-out space during formation of the backfill array (artificial ice pillar)

The invention relates to the mining industry and can be used for the protection of mining in conditions of high rock pressure

The invention relates to the mining industry and can be used for mining of bedded deposits

The invention relates to the mining industry, to a method of blasting with blasting and can be used in the development of deposits in conditions of high rock pressure

The invention relates to mining and can be used in underground mining of thick layers of minerals

The invention relates to mining and can be used for underground mining average power of bedded deposits of minerals

The invention relates to mining and can be used in underground reservoir minerals

The invention relates to mining and can be used in underground reservoir minerals

The invention relates to mining and can be used in the preparation of gas-saturated layer to simulate long posts

The invention relates to the field of mining and can be used in the development of fields in the conditions of permafrost (permafrost) systems with the mined-out space during formation of the backfill array (artificial ice pillar)

The invention relates to mining, diamond mining of steeply dipping bodies of kimberlite deposits

FIELD: mining industry.

SUBSTANCE: method includes use of screw-drilling machine for driving of several first ventilation shafts in ore body and driving several second shafts, while second and each second shaft crosses, at least, one matching first shaft, forming first support walls, supporting ceiling. First supporting ceilings consist of ore body zones between neighboring second shafts, each first support wall has portion of at least one first shaft, passing horizontally through it. Horizontal channels are formed, each of which is placed transversely to matching second shaft between appropriate portions of first shaft, formed in adjacent support walls, for forming of group of continuous ventilation shafts. Second shafts are filled for forming second supporting walls, supporting well ceiling, and first supporting walls are extracted. First ventilation shafts can be made parallel to each other. Second shafts may be directed perpendicularly relatively to first ventilation shafts. In ore body air-outlet and air-inlet ventilation mines can be formed, placed at distance from each other along horizontal line, while first or each first ventilation shaft passes through portion of ore body between air-inlet and air-outlet ventilation mines. Driving of second or each second shaft can be performed by cutting machine, or by drilling or explosive mining.

EFFECT: higher efficiency.

7 cl, 11 dwg

Up!