Coal mining tail end gangue fluidization roadway cemented filling method

Abstract

The invention discloses a coal mining tail end gangue fluidization roadway cemented filling method which comprises the following steps: when cemented slurry discharged by a slurry conveying pipeline flows downwards in a roadway to be filled, gangue discharged by a belt conveyor is driven to flow together; the cemented slurry drives the gangue to flow under the action of potential energy, so that the gangue and the cemented slurry can be naturally stirred and automatically filled; the method has the beneficial effects that the gangue material and the prepared cementing slurry are naturally mixed at the underground filling position, so that the filling mode not only reduces the energy consumption, but also reduces 2 / 3 of the filling cost by using a large amount of gangue, accelerates the filling speed, increases the strength of the filling body, and improves the filling quality. The damage to the environment caused by surface subsidence and ground gangue accumulation is avoided, and green and environment-friendly mining is realized. Meanwhile, the problem that the filling pipe is impacted and damaged by solid blocks in filling materials in a traditional filling mode is solved, pipeline blockage and fracture accidents are prevented, and the risk of mine accidents is reduced.

Description

Technical field:

[0001] The invention belongs to the field of coal mining tunnel filling, and in particular relates to a coal mining end gangue fluidized tunnel cementing filling method. Background technology:

[0002] During the construction and production process of underground coal mines, a large amount of solid waste, coal gangue, is generated. The traditional method of treating coal gangue is to lift it to the ground and pile it up. However, a large amount of coal gangue piled on the surface will form coal mine-specific gangue mountains, causing damage to the ecological environment. In order to reduce the negative impact of gangue, some coal mining companies adopt backfill mining to treat it.

[0003] The traditional filling method is to mix part of the gangue with the binder on the ground, and then transport it to the location underground that needs filling through a pumped filling pipe. This filling method has a simple system, but it consumes a lot of energy and has a high cost input during the filling process. The gangue processing capacity is low and the economic applicability is poor. In addition, the traditional filling method has a slow filling speed and is not timely. The filling body has low strength and is prone to surface subsidence. Both will cause great damage to the ecological environment.

[0004] Moreover, during the pipeline transportation process of the traditional filling method, the solid blocks in the filling material will cause great impact and wear on the filling pipe, which can easily cause pipeline blockage and rupture accidents, making the maintenance of the filling system complicated and the filling operation unable to be carried out normally on time, thereby increasing the risk of mine accidents. Summary of the invention:

[0005] The purpose of the present invention is to provide a method for cementing and filling fluidized gangue tunnels at the end of coal mining, which adopts the method of separating and transporting gangue slurry and centrally mixing and filling the tunnels at the underground working face to overcome the shortcomings of the above-mentioned existing technologies and effectively solve the problem of green, environmentally friendly and economical filling of tunnels in filling mining.

[0006] The content of the present invention: A method for cementing and filling fluidized gangue tunnels at the end of coal mining, comprising the following steps: Step 1, transporting the gangue materials mined on the ground to a gangue conveying station; Step 2, transporting the gangue materials in the gangue conveying station to the belt conveyor underground through a vertical conveying shaft, and the belt conveyor delivers the gangue materials to the return air chute of the continuous mining working face to be filled in the tunnel; Step 3, the pulping station delivers the prepared cementing slurry to the return air chute of the continuous mining working face to be filled in the tunnel through a slurry pipeline; Step 4, the cementing slurry discharged from the slurry pipeline drives the gangue unloaded by the belt conveyor to flow together when flowing downward in the tunnel to be filled, and the fluidized cementing slurry drives the gangue to flow under the action of potential energy, so that the gangue and the cementing slurry are mixed on the working face to form natural stirring and gravity filling.

[0007] Furthermore, the slurry transportation at the pulping station and the gangue transportation at the gangue transportation station are synchronously controlled in real time.

[0008] Furthermore, gangue automatic adjustment feeding devices are provided at the top and bottom of the feeding well.

[0009] Furthermore, a gangue crushing device is provided at the bottom of the feeding well.

[0010] Furthermore, an intelligent anti-blocking control system is provided in the conveying shaft.

[0011] Furthermore, a dynamic concentration measurement sensor is provided in the tunnel to be filled, and the sensor collects real-time information of the gangue slurry mixed fluid in the filling tunnel and feeds back the information to the ground pulping station synchronously.

[0012] Furthermore, the slurry delivery pipeline is a four-inch steel pipe.

[0013] Furthermore, a slurry injection control device is installed at the discharge port of the slurry conveying pipeline.

[0014] Furthermore, the bonding slurry is cement, fly ash and water, and the mass ratio of cement, fly ash and water is 40:25:35.

[0015] Furthermore, the mass ratio of the gangue to the cementitious slurry is 2.25:1.

[0016] The beneficial effects of the present invention are as follows: by adopting the separation and transportation of gangue slurry, the gangue material and the prepared cementing slurry are naturally mixed at the filling position of the underground working surface to form a mortar-like fluidized substance. The mixture realizes self-leveling in a creeping manner during the fluidization process, and is filled and connected to the top at a uniform speed from bottom to top, and finally realizes dense and top-connected filling of the entire tunnel. This filling method not only reduces energy consumption, but also reduces cost investment due to the large amount of gangue used and the strong gangue processing capacity, improves the filling speed and filling body strength, avoids surface subsidence and large accumulation of gangue on the ground, and realizes the problem of green, environmental protection and economic applicability of filling mining technology. At the same time, it also solves the problem of solid blocks in the filling material in the traditional filling method causing impact damage to the filling pipe, prevents pipeline blockage and rupture accidents, and reduces the risk of mine accidents. Description of the drawings:

[0017] Figure 1 It is an overall schematic diagram of the filling tunnel in the present invention;

[0018] In the figure: 1 gangue material, 2 gangue conveying station, 3 conveying shaft, 4 belt conveyor, 5 tunnel to be filled, 6 slurry making station, 7 slurry conveying pipeline. Specific implementation method:

[0019] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings:

[0020] like Figure 1 As shown, a method for cementing and filling the waste rock fluidized roadway at the end of coal mining comprises the following steps: Step 1, the waste rock materials 1 mined on the ground are transported to the waste rock conveying station 2; Step 2, the waste rock materials 1 in the waste rock conveying station 2 are transported to the belt conveyor 4 underground through the vertical feeding shaft 3, and the belt conveyor 4 transports the waste rock materials 1 to the return air chute to be filled in the roadway 5 of the continuous mining working face; Step 3, the slurry making station 6 passes the prepared cementing slurry through the The slurry delivery pipeline 7 is delivered to the return air chute of the continuous mining working face to be filled in the tunnel 5; step four, the cementing slurry discharged from the slurry delivery pipeline 7 drives the gangue unloaded by the belt conveyor 4 to flow together when it flows downward in the tunnel 5 to be filled, and the fluidized cementing slurry drives the gangue to flow under the action of potential energy, so that the gangue and the cementing slurry are mixed on the working face to form natural stirring and gravity filling; the slurry conveying of the slurry by the slurry making station 6 and the gangue conveying of the gangue by the gangue conveying station 2 are synchronously controlled in real time.

[0021] Specifically, by naturally mixing the gangue material 1 with the prepared cementing slurry at the underground filling position, the energy consumption and cost problems of traditional filling operations are reduced, and the filling speed and filling body strength are improved.

[0022] During actual use, the gangue material 1 screened out from the ground is transported to the gangue conveying station 2 after preliminary and uniform crushing, and is put into the conveying shaft 3 vertical to the underground. At this time, the gangue material 1 naturally falls into the well by its own gravity. The belt conveyor 4 transports the gangue material 1 to the return air chute to be filled tunnel 5 of the continuous mining working face, and then unloads it into the tunnel 5 to be filled through the gangue unloader. The underground original gangue is directly put into the belt conveyor 4 for transportation together. The pulping station 6 operating synchronously uses the static pressure conveying method to convey the cementing slurry to the return air chute to be filled tunnel 5 of the continuous mining working face through the slurry pipeline 7. After the solid and liquid meet, the kinetic energy at the end of the cementing slurry and its buoyancy and drag on the solid matter are used to realize the fluidization of the solid matter, that is, the gangue is driven to move together by the fluidity of the cementing slurry. The gangue and cementing slurry are naturally stirred and filled by gravity, and finally mixed into a new filling material to gradually fill the tunnel 5 to be filled; a gangue automatic adjustment and discharge device is provided at the top of the feeding shaft 3, a gangue crushing device is provided at the bottom of the feeding shaft 3, an intelligent anti-blocking control system is provided in the feeding shaft 3, and a dynamic concentration measurement sensor is provided in the tunnel 5 to be filled. The sensor collects real-time information on the gangue slurry mixed fluid in the filling tunnel and synchronously feeds back to the ground detection room. The slurry pipeline 7 is a four-inch steel pipe, and a slurry injection device is installed at the discharge port of the slurry pipeline 7. The cementing slurry is cement, fly ash and water, and the mass ratio of cement, fly ash and water is 40:25:35; the mass ratio of the gangue and cementing slurry is 2.25:1.

[0023] Specifically, the amount of gangue discharged can be further controlled by automatically adjusting the discharge device, so that the mixing ratio of gangue and cementing slurry underground is uniform.

[0024] In actual use, automatic adjustment and discharge devices for gangue are provided at the top and bottom of the feeding well 3. When the amount of cementing slurry is changed, the amount of gangue is adjusted so that the two can be mixed evenly in proportion in the tunnel to be filled 5; the gangue crushing device located at the bottom of the feeding well 3 can further crush the gangue evenly, thereby reducing the large pieces of gangue with poor self-flow ability after the gangue slurry is mixed; the intelligent anti-blocking control system set in the feeding well 3 can make the transportation of gangue smoother; when the amount of gangue is increased, the slurry injection device installed at the discharge port of the slurry pipeline 7 can further increase the flow rate of the cementing slurry, increase the kinetic energy, enable it to be better mixed with the gangue and drive the gangue to move; the dynamic concentration measurement sensor and sensor set in the tunnel to be filled 5 can collect real-time information on the gangue slurry mixed fluid in the filling tunnel, and synchronously feed back the information to the ground slurry station, so that the ground staff can adjust the filling ratio in time.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for cementing and filling waste rock fluidized roadway at the end of coal mining, characterized by: The invention comprises the following steps: step 1, the gangue materials (1) mined on the ground are transported to the gangue conveying station (2); step 2, the gangue materials (1) in the gangue conveying station (2) are transported to the belt conveyor (4) under the well through the vertical feeding shaft (3); the belt conveyor (4) transports the gangue materials (1) to the return air chute to be filled roadway (5) of the continuous mining working face; step 3, the pulping station (6) prepares the glue The cemented slurry is delivered to the return air chute of the continuous mining working face to be filled (5) through the slurry delivery pipeline (7); in step 4, the cemented slurry discharged from the slurry delivery pipeline (7) drives the gangue unloaded by the belt conveyor (4) to flow together when it flows downward in the to-be-filled tunnel (5). The fluidized cemented slurry drives the gangue to flow under the action of potential energy, so that the gangue and the cemented slurry are mixed on the working face, forming natural stirring and gravity filling.

2. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 1, characterized in that: The cementing slurry delivered by the slurry making station (6) and the gangue delivered by the gangue delivery station (2) are synchronously controlled in real time.

3. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 1, characterized in that: Gangue automatic adjustment feeding devices are provided at the top and bottom openings of the feeding well (3).

4. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 3, characterized in that: A gangue crushing device is provided at the bottom of the feeding well (3).

5. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 3, characterized in that: An intelligent anti-blocking control system is provided in the material conveying well (3).

6. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 1, characterized in that: A dynamic concentration measurement sensor is provided in the tunnel to be filled (5), and the sensor collects real-time information on the gangue slurry mixed fluid in the filling tunnel and synchronously feeds back information to the ground pulping station.

7. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 1, characterized in that: The slurry delivery pipeline (7) is a four-inch steel pipe.

8. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 6, characterized in that: A slurry injection control device is installed at the discharge port of the slurry delivery pipeline (7).

9. The method for cementing and filling the fluidized gangue roadway at the end of coal mining according to claim 1, characterized in that: The bonding slurry is composed of cement, fly ash and water, and the mass ratio of the cement, fly ash and water is 40:25:

35.

10. The method for cementing and filling fluidized gangue tunnels at the end of coal mining according to claim 1, characterized in that: The mass ratio of the gangue to the cementing slurry is 2.25:1.

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