CN112377247B - In-situ grouting filling method for in-situ separation of coal mine underground gangue - Google Patents
In-situ grouting filling method for in-situ separation of coal mine underground gangue Download PDFInfo
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- CN112377247B CN112377247B CN202011134893.0A CN202011134893A CN112377247B CN 112377247 B CN112377247 B CN 112377247B CN 202011134893 A CN202011134893 A CN 202011134893A CN 112377247 B CN112377247 B CN 112377247B
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- coal
- gangue
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- slurry
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
Abstract
The invention discloses an in-situ separation and grouting filling method for underground coal mine waste rock, which comprises the steps of firstly transferring raw coal on a coal conveying belt in a conveying roadway to a separation and pulping roadway by using a plow discharger, then dividing the raw coal into clean coal, slack coal and waste rock by using a screening and separation system, returning the clean coal and the slack coal to the coal conveying belt in the conveying roadway by using a coal returning belt, preparing the waste rock into slurry with preset concentration by using a crushing system and a pulping system, and finally filling the waste rock slurry into a goaf behind a stoping face by using a grouting pump in a pipeline conveying mode through the conveying roadway of an adjacent working face and an adjacent grouting hole. The invention can ensure that the coal gangue does not rise in the well under the condition of not influencing the normal production of the coal mine, and can be efficiently, safely and low-cost filled into the in-situ goaf.
Description
Technical Field
The invention belongs to the technical field of mining, and particularly relates to an in-situ separation and grouting filling method for underground gangue of a coal mine, which is suitable for a coal face with more gangue and small water inflow in a coal seam.
Background
The underground coal mine can generate a large amount of solid waste, namely coal gangue, in the construction and production processes, and the coal gangue is lifted to the ground for stacking, the coal gangue is continuously stacked on the ground surface or comprehensively utilized in the traditional treatment mode, the comprehensive utilization inherits the green development concept, so that the coal gangue is applied to various aspects of power generation, building materials, fertilizer preparation, reclamation and the like, but only a small amount of coal gangue can be solved, and a large amount of coal gangue is stacked on the ground surface to form a special gangue dump of the coal mine, thereby causing great threat and damage to the ecological environment. In recent years, with the rapid development of underground coal mine filling, coal gangue is filled in a goaf as a solid or paste material, which becomes a way of effectively solving the problem of coal gangue discharge, but for solid filling, the lower filling efficiency and higher filling cost become main factors restricting the development of the coal gangue, and the high cost of paste filling and the complex process thereof cannot be widely applied. Therefore, an efficient, safe and low-cost filling method for coal gangue on-site disposal without lifting a well is needed.
Disclosure of Invention
The invention aims to provide an in-situ grouting filling method for in-situ separation of gangue in a coal mine, which can ensure that the gangue does not rise in a well under the condition of not influencing the normal production of the coal mine, and can be filled into an in-situ goaf efficiently, safely and at low cost.
The invention is realized by adopting the following technical scheme:
the method comprises the steps of firstly, transferring raw coal on a coal conveying belt in a conveying roadway to a separation pulping roadway by using a plow discharger, then, dividing the raw coal into clean coal, slack coal and gangue by using a screening separation system, returning the clean coal and the slack coal to the coal conveying belt in the conveying roadway by using a coal returning belt, preparing the gangue into slurry with preset concentration by using a crushing system and a pulping system, and finally, filling the gangue slurry into a goaf behind the stoping working face through the conveying roadway of an adjacent working face and an adjacent grouting hole in a pipeline conveying mode by using a grouting pump.
The invention further improves that the separation pulping lane is positioned in the middle of the stoping line and the auxiliary transportation main lane, and three systems, namely a screening separation system, a crushing buffer system and a pulping pumping system, are arranged in the separation pulping lane.
The invention is further improved in that the screening and sorting system comprises a vibrating screening machine, a distributing device and an intelligent dry separation machine, wherein the vibrating screening machine screens slack coal in the raw coal to a coal returning belt, the distributing device lays the blocky raw coal orderly, and the intelligent dry separation machine separates clean coal and gangue in the blocky raw coal.
The crushing caching system is further improved in that the crushing caching system comprises a jaw crusher, a two-stage crusher and a gangue powder caching bin, gangue is crushed into powder with the size of 2mm through two-stage crushing of the jaw crusher and the two-stage crusher, and the gangue powder caching bin is used for caching gangue powder.
The invention has the further improvement that the pulping pumping system comprises a stirring tank, a pulp storage tank and a grouting pump, wherein the stirring tank is positioned on a roadway bottom plate, the pulp storage tank is positioned below the bottom plate and is connected with the bottom plate through a chute, the stirring tank is used for preparing the gangue powder, water and additives into slurry with preset concentration, the water is from mine water, the pulp storage tank is used for storing the prepared slurry, and the grouting pump is used for conveying the slurry in the pulp storage tank to a goaf through a pipeline.
The invention is further improved in that the adjacent grouting holes are inclined holes inclined upward from the conveying lane of the adjacent working face to the goaf of the stope, the distance between the adjacent grouting holes is 30m, and the adjacent grouting holes lags behind the stope by 100m.
The invention has the further improvement that the in-situ separation and in-situ grouting filling of the underground gangue of the coal mine comprises the following steps:
a. along with the extraction of the working face, raw coal is conveyed to a coal conveying belt in a conveying roadway from the working face through a scraper conveyor;
b. when the coal conveying belt conveys the raw coal to the plow discharger, the plow discharger discharges the raw coal onto the transfer belt, and the transfer belt conveys the raw coal to the separation and pulping lane;
c. after raw coal enters a separation pulping lane, the raw coal firstly enters a vibration screening machine, the vibration screening machine screens slack coal in the raw coal onto a coal returning belt, then the slack coal is conveyed back to a coal conveying belt, and the rest of blocky raw coal is conveyed to a distributing device and then enters an intelligent dry separation machine;
d. after passing through an intelligent dry separator, the blocky raw coal is divided into clean coal and gangue, the clean coal enters a coal return belt and is conveyed to a coal conveying belt, the gangue sequentially enters a jaw crusher and a two-stage crusher to be crushed, finally the gangue is crushed into gangue powder with the particle size of 2mm, and then the gangue powder enters a gangue powder buffer bin;
e. firstly, injecting a proper amount of water and additives into the stirring pool, then conveying the waste rock powder in the waste rock powder buffer bin into the stirring pool through a belt for stirring, sliding the prepared slurry into the slurry storage pool by using a chute after stirring for 10-15 min, and finally filling the slurry in the slurry storage pool into a goaf behind the stope through a conveying roadway and an adjacent grouting hole of an adjacent working face by using a grouting pump in a pipeline conveying mode.
The invention has at least the following beneficial technical effects:
the in-situ separation and grouting filling method for the underground gangue of the coal mine can realize high-efficiency and low-cost discharge of the gangue without lifting a well under the condition of not influencing the normal production of a working face. In the aspect of raw coal transportation, the method enables the raw coal to be separated into slack coal, clean coal and gangue underground on site, greatly saves the transportation cost of the gangue in the raw coal, reduces the ineffective lifting of the gangue, and improves the lifting amount of the clean coal; in the aspect of slurry filling, the in-situ grouting filling efficiency is higher, the filling capacity is larger, the mine water can be cooperatively treated, and the pollution to the environment of a mining area caused by lifting the gangue and the mine water to the ground is avoided; in the aspect of rock stratum control, the gap between the rock blocks of the caving zone is filled with the gangue slurry, further compression of the caving rock blocks can be limited, further displacement of the top plate overlying rock of the goaf is weakened, and therefore the purpose of weakening surface subsidence is achieved. In addition, compared with the filling of solid and paste on the working face, the filling method does not need to arrange an independent working face, realizes the independent mining and filling operation, has the filling efficiency not limited by the tunneling speed any more compared with the short-wall roadway type filling, and realizes the purpose of processing the gangue on a large scale.
Drawings
FIG. 1 is a plan view schematically illustrating an in-situ grouting filling method for in-situ separation of underground gangue in a coal mine according to the invention;
FIG. 2 is a schematic view of a screening and sorting system of the present invention;
FIG. 3 is a schematic diagram of a fragmentation caching system of the present invention;
FIG. 4 is a schematic view of the present pulping pumping system;
FIG. 5 isbase:Sub>A sectional view A-A ofbase:Sub>A plane schematic view of the in-situ separation grouting filling method for the gangue under the coal mine well;
description of reference numerals:
the method comprises the following steps of 1-working face, 2-conveying lane, 3-separation pulping lane, 4-auxiliary conveying lane, 5-conveying lane adjacent to the working face, 6-auxiliary conveying lane, 7-conveying lane, 8-return air lane, 9-goaf, 10-plough discharger, 11-vibration screening machine, 12-distributor, 13-intelligent dry separation machine, 14-jaw crusher, 15-double-stage crusher, 16-gangue powder buffer bin, 17-stirring tank, 18-slurry storage tank, 19-grouting pump, 20-scraper conveyor, 21-coal conveying belt, 22-transfer belt, 23-coal return belt, 24-water pipe, 25-grouting pipe, 26-adjacent-position grouting hole, 27-stoping line and 28-chute.
Detailed Description
For a better understanding of the present invention, the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1 to 5, the method for in-situ separation and in-situ grouting filling of underground gangue of a coal mine provided by the invention comprises the steps of firstly transferring raw coal on a coal conveying belt 21 in a conveying roadway to a separation and pulping roadway by using a plow discharger 10, then dividing the raw coal into clean coal, slack coal and gangue by using a separation and screening system, returning the clean coal and the slack coal to the coal conveying belt 21 in the conveying roadway by using a coal returning belt 23, preparing the gangue into slurry with preset concentration by using a crushing system and a pulping system, and finally filling the gangue slurry into a goaf 9 behind the mining working face by using a grouting pump 19 in a manner of conveying the gangue slurry through a conveying roadway 5 and an adjacent grouting hole 26 of an adjacent working face by using a grouting pipe 25.
The auxiliary transportation main lane 6, the transportation main lane 7 and the return air main lane 8 are three development main lanes, a water pipe 24 is distributed in the auxiliary transportation main lane 6, the water pipe enters the separation pulping lane from the auxiliary transportation main lane through the auxiliary transportation lane to provide a water source for the stirring pool, and the water source is mine water; the main transportation lane is connected with the transportation lane and is a main channel for transporting coal to the ground; the air return main roadway is an air return channel of the whole mining area.
The separation pulping lane is positioned in the middle of the stope line 27 and the auxiliary transportation main lane 6, and three systems, namely a screening separation system, a crushing buffer system and a pulping pumping system, are arranged in the separation pulping lane.
The screening and sorting system comprises a vibrating screening machine 11, a distributing device 12 and an intelligent dry separation machine 13, slack coal in raw coal is screened onto a coal returning belt 23 by the vibrating screening machine, blocky raw coal is laid by the distributing device 12 in order, and clean coal and gangue in the blocky raw coal are separated by the intelligent dry separation machine 13. The crushing caching system comprises a jaw crusher 14, a double-stage crusher 15 and a gangue powder caching bin 16, gangue is crushed into powder with the size of 2mm through two-stage crushing of the jaw crusher and the double-stage crusher 15, and the gangue powder caching bin 16 is used for caching gangue powder. Pulping pumping system includes stirring pond 17, stores up thick liquid pond 18 and grouting pump 19, and stirring pond 17 is located the tunnel bottom plate, and stores up thick liquid pond 18 and is located under the bottom plate, and both connect through chute 28, and stirring pond 17's effect is the slurry of making waste rock powder, water and additive and predetermineeing concentration, and water derives from the mine water, and the slurry of making is stored to storing pond 18's effect, and grouting pump 19's effect is to pass through pipeline transport to collecting space area 9 with the slurry in the storing pond 18.
The adjacent grouting holes 26 are inclined holes inclined upward in the drilling direction from the conveying lane 5 of the adjacent working face to the goaf 9 of the stope face, the distance between the adjacent grouting holes 26 is 30m, and the adjacent grouting holes are delayed by 100m from the stope face.
The specific process flow of the invention is as follows:
a. along with the extraction of the working face 1, raw coal is transported from the working face 1 to a coal conveying belt 21 in the conveying roadway 2 through a scraper conveyor 20;
b. when the coal conveying belt 21 conveys the raw coal to the plow discharger 10, the plow discharger 10 discharges the raw coal onto the transfer belt 22, and the transfer belt 22 conveys the raw coal to the separation and pulping lane 3;
c. after raw coal enters the separation pulping lane 3, the raw coal firstly enters a vibration screening machine 11, the vibration screening machine 11 screens slack coal in the raw coal onto a coal returning belt 23, then the slack coal is conveyed onto a coal conveying belt 21, and the rest of blocky raw coal is conveyed onto a distributor 12 and then enters an intelligent dry separation machine 13;
d. after passing through the intelligent dry separator 13, the blocky raw coal is divided into clean coal and gangue, the clean coal enters the coal return belt 23 and is conveyed to the coal conveying belt 21, the gangue sequentially enters the jaw crusher 14 and the two-stage crusher 15 to be crushed, and finally is crushed into gangue powder with the size of about 2mm, and then the gangue powder enters the gangue powder buffer bin 16;
e. injecting a proper amount of water and additives into a stirring pool 17, conveying the waste rock powder in a waste rock powder buffer bin 16 into the stirring pool 17 through a belt for stirring, after stirring for 10-15 min, slipping the prepared slurry into a slurry storage pool 18 by using a chute 28, and finally filling the waste rock slurry into a goaf 9 behind the stope by using an injection pump 19 in a manner that the waste rock slurry is conveyed by an injection pipe 25 through a conveying roadway 5 and an adjacent grouting hole 26 of the adjacent working face.
Claims (1)
1. The method is characterized in that firstly, a plough-type discharger is used for transferring raw coal on a coal conveying belt in a conveying roadway to a separation pulping roadway, then a screening separation system is used for separating the raw coal into clean coal, slack coal and gangue, the clean coal and the slack coal return to the coal conveying belt in the conveying roadway through a coal return belt, the gangue is made into slurry with preset concentration through a crushing system and a pulping system, and finally a grouting pump is used for filling the gangue slurry into a goaf behind a stope face through the conveying roadway of an adjacent working face and an adjacent grouting hole in a pipeline conveying mode;
the separation pulping lane is positioned in the middle of the stoping line and the auxiliary transportation main lane, and three systems, namely a screening separation system, a crushing buffer system and a pulping pumping system, are arranged in the separation pulping lane;
the screening and sorting system comprises a vibrating screening machine, a distributing device and an intelligent dry sorting machine, wherein the vibrating screening machine screens slack coal in raw coal to a coal returning belt, the distributing device lays the blocky raw coal orderly, and the intelligent dry sorting machine separates clean coal and gangue in the blocky raw coal;
the crushing and caching system comprises a jaw crusher, a two-stage crusher and a waste rock powder caching bin, waste rocks are crushed into powder with the size of 2mm through two-stage crushing of the jaw crusher and the two-stage crusher, and the waste rock powder caching bin is used for caching waste rock powder;
the pulping pumping system comprises a stirring pool, a slurry storage pool and a grouting pump, wherein the stirring pool is positioned on a roadway bottom plate, the slurry storage pool is positioned below the bottom plate and is connected with the bottom plate through a chute, the stirring pool is used for preparing gangue powder, water and additives into slurry with preset concentration, the water is from mine water, the slurry storage pool is used for storing the prepared slurry, and the grouting pump is used for conveying the slurry in the slurry storage pool to a goaf through a pipeline;
the adjacent grouting holes are inclined upward holes drilled from the conveying lane of the adjacent working face to the goaf of the stope working face, the distance between the adjacent grouting holes is 30m, and the adjacent grouting holes lags behind the stope working face by 100m;
the in-situ separation and grouting filling of the underground gangue of the coal mine comprises the following steps:
a. along with the extraction of the working face, raw coal is conveyed to a coal conveying belt in a conveying roadway from the working face through a scraper conveyor;
b. when the coal conveying belt conveys the raw coal to the plow discharger, the plow discharger discharges the raw coal onto the transfer belt, and the transfer belt conveys the raw coal to the separation and pulping lane;
c. after raw coal enters a separation pulping lane, the raw coal firstly enters a vibration screening machine, the vibration screening machine screens slack coal in the raw coal to a coal returning belt, then the slack coal is conveyed back to a coal conveying belt, and the rest of blocky raw coal is conveyed to a distributor and then enters an intelligent dry separation machine;
d. after passing through an intelligent dry separator, the blocky raw coal is divided into clean coal and gangue, the clean coal enters a coal return belt and is conveyed to a coal conveying belt, the gangue sequentially enters a jaw crusher and a two-stage crusher to be crushed, finally the gangue is crushed into gangue powder with the particle size of 2mm, and then the gangue powder enters a gangue powder buffer bin;
e. firstly, injecting a proper amount of water and additives into the stirring pool, then conveying the waste rock powder in the waste rock powder buffer bin into the stirring pool through a belt for stirring, sliding the prepared slurry into the slurry storage pool by using a chute after stirring for 10-15 min, and finally filling the slurry in the slurry storage pool into a goaf behind the stope through a conveying roadway and an adjacent grouting hole of an adjacent working face by using a grouting pump in a pipeline conveying mode.
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| CN112796829A (en) * | 2021-03-30 | 2021-05-14 | 陕西煤业化工技术研究院有限责任公司 | Underground original gangue filling system and method for caving area of fully mechanized caving face |
| CN113250743A (en) * | 2021-05-31 | 2021-08-13 | 中煤能源研究院有限责任公司 | Coal mine underground working face mining, selecting and charging integrated system and using method |
| CN113339056A (en) * | 2021-06-24 | 2021-09-03 | 中国矿业大学 | Fluidized gangue layer surface subsequent filling system and method |
| CN113638768B (en) * | 2021-08-25 | 2024-01-26 | 中煤能源研究院有限责任公司 | Underground gangue powder transportation system with buffer device and use method |
| CN113893933B (en) * | 2021-10-21 | 2023-03-14 | 中煤能源研究院有限责任公司 | Aboveground crushing and underground pulping system and using method |
| CN114776370B (en) * | 2022-05-18 | 2024-04-16 | 中煤地生态环境科技有限公司 | Method for treating coal gangue |
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| GB2158855B (en) * | 1984-04-11 | 1988-03-09 | Bergwerksverband Gmbh | Method for refilling the voids of debris and pipeline for carrying out the method |
| CN107246279B (en) * | 2017-07-11 | 2019-05-28 | 太原理工大学 | Underground, which picks up sieve and mixes, fills the cementing construction filling system of integrated spoil and method |
| CN107755283A (en) * | 2017-10-26 | 2018-03-06 | 天津美腾科技有限公司 | Underground coal mine dry separation waste rock discharge device and technique |
| CN111335944B (en) * | 2020-03-30 | 2021-06-15 | 中煤能源研究院有限责任公司 | Coal face gangue slurry pipeline collaborative filling method |
| CN111744662A (en) * | 2020-07-23 | 2020-10-09 | 中国矿业大学 | Underground movable intelligent mining and selecting modular process method |
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