Underground mining metal mine paste filling system and filling method thereof

Abstract

The invention discloses an underground mining metal mine paste filling system and a filling method thereof, and relates to the technical field of paste filling. Comprising a goaf, a coal gangue bin, a fly ash bin, a crusher mounted below the coal gangue bin and the fly ash bin, a buffer bin mounted on one side of the crusher, a first conveyor connected between the crusher and the buffer bin, a stirrer mounted below the buffer bin, and a second conveyor connected between the buffer bin and the stirrer, the cementing stock bin is arranged above the stirring machine, and the water bin is arranged on one side of the stirring machine. By arranging the air positive pressure system and the air negative pressure system, the cleaning effect of water flow on the inner wall of the filling pipeline can be better, and residual stubborn slurry particles on the pipe wall can be effectively removed through high impact force generated when the water flow is pressed; and by arranging the circulating recovery system, the effect of discharging flushing sewage in the filling pipeline to the ground is achieved, and the situation that slurry solidification is affected by accumulated water in the goaf is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of paste filling, in particular to an underground metal ore paste filling system and a filling method thereof. Background Art

[0002] Paste filling is a technology that uses paste for mining filling. In metal mines, paste filling can be used when the ore is stable but the surrounding rock is not stable enough, the surface is not allowed to collapse, and rare precious metals or high-grade rich ores are mined. The use of paste filling mining can effectively control surface subsidence, support rock formations, and reduce the impact of coal mining on the surface. The paste is a toothpaste-like mud made by mixing surface tailings and other solid waste with a binder and water, which realizes the resource utilization of all tailings and reduces the emission and accumulation of solid waste in mines.

[0003] At present, paste filling technology is mostly completed using an overall paste filling system. The paste filling system is usually composed of multiple silos, conveyors, crushers, mixers, filling pumps and filling pipes. The filling method is to mix the solid materials processed by the crusher with water in a certain proportion, and mix them into a paste through a mixer. Then, a filling pump is used to transport the paste to the goaf through a filling pipe. The paste solidifies in the goaf to form a filling body with a certain strength. After filling, clean water needs to be passed into the mixer, and the filling pump will pump water into the filling pipe to flush the mixer and the filling pipe. The sewage after flushing is passed into the goaf.

[0004] The impact effect of water flowing in the filling pipe is limited. It can easily wash away slightly adhered slurry particles, but it is difficult to completely flush out stubborn residues. The current cleaning method is to enhance the flushing effect of the filling pipe by pumping water multiple times, but the water of each flushing is directly discharged into the goaf. Multiple drainage causes excessive water accumulation in the goaf, affecting the normal solidification of the slurry in the goaf. Summary of the Invention

[0005] The object of the present invention is to provide an underground mining metal ore paste filling system and a filling method thereof to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A metal ore paste filling system for underground mining, comprising a goaf, a gangue bin, a fly ash bin, a crusher installed below the gangue bin and the fly ash bin, a buffer bin installed on one side of the crusher, a first conveyor connected between the crusher and the buffer bin, a mixer installed below the buffer bin, a second conveyor connected between the buffer bin and the mixer, a cementing material bin installed above the mixer, a water tank installed on one side of the mixer, a filling pipe connected to the bottom of the mixer, and a filling pump installed on the filling pipe, an upper shut-off valve installed on the filling pipe below the filling pump, a lower shut-off valve installed on the filling pipe on one side of the goaf, an air negative pressure system connected to the side wall of the filling pipe below the upper shut-off valve, a circulation recovery system connected to the side wall of the filling pipe below the air negative pressure system, and an air positive pressure system connected to the side wall of the filling pipe below the circulation recovery system;

[0008] The positive air pressure system includes a high-pressure air pump installed on the ground, the air outlet of the high-pressure air pump is connected to an air charging main pipe, one side of the air charging main pipe is connected to a first branch pipe, the bottom of the air charging main pipe is connected to a second branch pipe, a first air charging valve is installed on the first branch pipe, a second air charging valve is installed on the second branch pipe, and the air inlet of the high-pressure air pump is connected to a compressed gas generator;

[0009] The air negative pressure system includes a vacuum pump, an air intake pipe is connected between the air inlet of the vacuum pump and the filling pipe, and an air intake valve is installed on the air intake pipe.

[0010] Preferably, the inflation main is connected to the above-ground portion of the filling pipeline via a first branch pipe, the second branch pipe is inserted into the ground, and the inflation main is connected to the underground portion of the filling pipeline close to the goaf via the second branch pipe.

[0011] Preferably, the vacuum pump is connected to the filling pipe via an air suction pipe, and the air negative pressure system and the air positive pressure system are both installed on the side wall of the filling pipe between the upper shut-off valve and the lower shut-off valve.

[0012] Preferably, the circulation recovery system includes a recovery box installed on the ground, the top of the recovery box is connected to a drain pipe, the drain pipe is installed with a drain pump, the drain pipe on the side of the drain pump close to the filling pipe is installed with a drain valve, the side wall of the recovery box is connected to a water inlet pipe, the water inlet pump is installed on the water inlet pipe, the water inlet valve is installed on the water inlet pipe on the side of the water inlet pump close to the filling pipe, and a flow meter is installed on the water inlet pipe between the water inlet pump and the water inlet valve.

[0013] Preferably, a filter is installed inside the recovery box, and the filter divides the inner cavity of the recovery box into a slurry stirring chamber and a water storage chamber arranged up and down. A rotating shaft is installed in the middle of the slurry stirring chamber, and a bearing is installed between the bottom of the rotating shaft and the filter. The top of the rotating shaft extends from the upper surface of the recovery box and is connected to a motor. A slurry discharge port is opened through the side wall of the recovery box on one side of the slurry stirring chamber, a material guide plate is connected to the outside of the slurry discharge port, a baffle is movably inserted inside the slurry discharge port, and an electric push rod is connected to the top of the baffle.

[0014] Preferably, one side of the drainage pipe is connected to the filling pipe, and the other side of the drainage pipe is connected to the slurry stirring chamber in the recovery box. One end of the water inlet pipe is connected to the water storage chamber in the recovery box, and the other end of the water inlet pipe is connected to the filling pipe.

[0015] Preferably, the outer side wall of the rotating shaft is connected with a stirring rod, and the stirring rod is rotatably connected to the rotating shaft and the recovery box via a bearing.

[0016] A method for filling a paste of an underground metal ore, which adopts the above-mentioned underground metal ore paste filling system, comprises the following steps:

[0017] S1: Open the water tank, introduce a certain amount of clean water into the mixer, and open the bottom valve of the mixer, as well as the upper shut-off valve and the lower shut-off valve. Use the filling pump to introduce clean water into the filling pipe to preliminarily clean the filling pipe and remove the air in the filling pipe.

[0018] S2: Open the fly ash bin and the gangue bin to feed a fixed ratio of fly ash and gangue into the crusher. The crusher processes the fly ash and gangue into aggregate, and the first conveyor transports the aggregate to the buffer bin for storage.

[0019] S3: Open the buffer bin, water bin, and cementitious material bin, and introduce fixed proportions of aggregate, cementitious material, and water into the mixer. The mixer mixes the aggregate, cementitious material, and water to form a slurry.

[0020] S4: After the material is discharged from the bottom of the mixer, the filling pump will pass the slurry into the filling pipe. The slurry will flow in the filling pipe until it enters the goaf behind the working face.

[0021] S5: After the slurry filling is completed, close the lower throttle valve, open the water tank and introduce a certain amount of clean water into the mixer. The clean water will flush out the residual slurry on the inner wall of the mixer, and the filling pump will introduce the water into the filling pipe, and then close the upper shut-off valve;

[0022] S6: When water flows in the filling pipe, some slurry residue on the inner wall of the filling pipe is removed. The suction valve and the second inflation valve are opened. The high-pressure inflation pump passes the compressed gas produced by the compressed gas generator into the underground part of the filling pipe through the inflation main pipe and the second branch pipe. At the same time, the vacuum pump sucks the above-ground part of the filling pipe through the suction pipe. The water is pushed upward in the filling pipe by the method of upper suction and lower inflation;

[0023] S7: Close the second inflation valve and the suction valve, open the first inflation valve, the vacuum pump stops suction and starts exhausting, and at the same time, the compressed gas produced by the high-pressure inflation pump through the compressed gas generator is introduced into the above-ground part of the filling pipe through the inflation main pipe and the first branch pipe. The driving effect of the upper inflation and the downward flow of water due to gravity push the water to flow downward in the filling pipe;

[0024] S8: Repeat S6 and S7 multiple times to drive the water flow to flow up and down in the filling pipe. The water flow is driven by positive and negative pressure to enhance the impact effect, thereby removing the slurry residue on the inner wall of the filling pipe.

[0025] S9: After flushing is completed, the first air filling valve is closed, the drain valve is opened, and the drainage pump discharges the sewage in the filling pipe into the recovery tank through the drainage pipe on the ground;

[0026] S10: The sewage entering the recovery tank is filtered through the filter in the slurry stirring chamber, and the slurry particles remain on the filter. The water flows into the water storage chamber for collection. When the filling pipe is cleaned for the second time, the water inlet valve is opened and the water filtered out of the water storage chamber is re-introduced into the filling pipe by the water inlet pump for reuse.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] 1. The local underground mining metal ore paste filling system and filling method thereof are provided with an air positive pressure system and an air negative pressure system, and the compressed gas is introduced into the underground part of the filling pipeline through the inflation main pipe and the second branch pipe by a high-pressure air pump, and the above-ground part of the filling pipeline is sucked by the vacuum pump through the suction pipe, so that the flushing water in the filling pipeline is sucked by the vacuum on the top and squeezed by the compressed gas on the bottom, thereby pushing the flushing water to flow upward in the filling pipeline. Then, the high-pressure air pump is used to switch the inflation main pipe and the first branch pipe to the above-ground part of the filling pipeline through compressed gas, so that the flushing water is squeezed by the compressed gas on the top and flows downward in the filling pipeline with gravity, and the water flow is driven to flow back and forth up and down in the filling pipeline, and the flushing force of the water flow in the filling pipeline is enhanced by compressed gas squeezing, vacuum suction and water flow falling by gravity, so that the water flow has a better cleaning effect on the inner wall of the filling pipeline, and the high impact force generated by the pressure of the water flow can effectively remove the stubborn slurry particles remaining on the pipe wall.

[0029] 2. The local underground mining metal ore paste filling system and filling method thereof, by setting up a circulation recovery system, the sewage after flushing in the filling pipe is sucked out by a drainage pump, and the sewage is sucked from the filling pipe into the drainage pipe, and finally collected from the drainage pipe into the recovery box, so as to achieve the effect of discharging the flushing sewage in the filling pipe to the ground, changing the traditional paste filling method of discharging all the flushing water into the goaf, avoiding the situation where water accumulates in the goaf and affects the solidification of the slurry.

[0030] 3. The local underground mining metal ore paste filling system and filling method thereof are provided with a filter, a water inlet pipe and a water inlet pump. The flushing sewage discharged into the recovery box enters the slurry stirring chamber first. The sewage is filtered through the filter in the slurry stirring chamber, and the slurry particles remain on the filter. The water flows into the water storage chamber for collection. When the filling pipe is cleaned for the second time, the water inlet valve is opened, and the water filtered out of the water storage chamber is re-introduced into the filling pipe by the water inlet pump for reuse, thereby achieving the effect of recycling and filtering the flushing sewage and reusing it for flushing the filling pipe.

[0031] 4. The local underground mining metal ore paste filling system and filling method thereof are as follows: by setting a rotating shaft and a stirring rod, the slurry particles left on the surface of the filter are accumulated in the slurry stirring chamber. In order to prevent the slurry particles from agglomerating on the filter, the rotating shaft is driven by a motor to rotate, and the rotating shaft drives the stirring rod to stir the slurry particles. The baffle can be pushed out of the slurry discharge port by extending the electric push rod, and the slurry particles in the slurry stirring chamber can be discharged for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the filling system of the present invention;

[0033] Figure 2 Schematic diagram of the connection structure of the air positive pressure system, air negative pressure system and recycling system with the filling pipeline of the present invention;

[0034] Figure 3 This is a schematic diagram of the front cross-section structure of the recycling box of the present invention.

[0035] In the figure: 1. Gangue silo; 2. Crusher; 3. First conveyor; 4. Buffer silo; 5. Fly ash silo; 6. Second conveyor; 7. Mixer; 8. Cementing material silo; 9. Water silo; 10. Filling pipe; 11. Goaf; 12. Filling pump; 13. Upper shut-off valve; 14. Lower shut-off valve; 15. Air positive pressure system; 151. High-pressure air pump; 152. Air main pipe; 153. First branch pipe; 154. First air valve; 155. Second branch pipe; 156. Second air valve; 157. Compressed gas generator; 16. Air negative pressure system; 161 , vacuum pump; 162, suction pipe; 163, suction valve; 17, recycling system; 171, recovery box; 1711, filter; 1712, slurry stirring chamber; 1713, water storage chamber; 1714, rotating shaft; 1715, bearing; 1716, stirring rod; 1717, motor; 1718, slurry discharge port; 1719, guide plate; 17110, baffle; 17111, electric push rod; 172, drain pipe; 173, drain pump; 174, drain valve; 175, water inlet pipe; 176, water inlet pump; 177, flow meter; 178, water inlet valve. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 3 As shown, an underground mining metal ore paste filling system includes a goaf 11, a coal gangue bin 1, a fly ash bin 5, a crusher 2 installed below the coal gangue bin 1 and the fly ash bin 5, a buffer bin 4 installed on one side of the crusher 2, a first conveyor 3 connected between the crusher 2 and the buffer bin 4, a mixer 7 installed below the buffer bin 4, a second conveyor 6 connected between the buffer bin 4 and the mixer 7, a binder silo 8 installed above the mixer 7, a water tank 9 installed on one side of the mixer 7, a filling pipe 10 connected to the bottom of the mixer 7, and a filling pump 12 installed on the filling pipe 10, and also includes a central control station for controlling the normal operation of each device in the system and monitoring the equipment operation data. The filling pipe 10 below the filling pump 12 An upper shut-off valve 13 is installed on the upper portion, and a lower shut-off valve 14 is installed on the filling pipe 10 on one side of the goaf 11. The upper shut-off valve 13 and the lower shut-off valve 14 are used to seal the upper and lower ends of the filling pipe 10 to maintain a closed area for water flow and flushing. The side wall of the filling pipe 10 below the upper shut-off valve 13 is connected to an air negative pressure system 16, which is used to suck the top of the filling pipe 10 and apply negative pressure suction to the flushing water. The side wall of the filling pipe 10 below the air negative pressure system 16 is connected to a circulation recovery system 17, which is used to recover the sewage after flushing in the filling pipe 10. The side wall of the filling pipe 10 below the circulation recovery system 17 is connected to an air positive pressure system 15, which is used to introduce compressed gas into the filling pipe 10 and apply positive pressure to the flushing water.

[0038] The air positive pressure system 15 includes a high-pressure air pump 151 installed on the ground. The air outlet of the high-pressure air pump 151 is connected to an air filling main pipe 152. One side of the air filling main pipe 152 is connected to a first branch pipe 153. The bottom of the air filling main pipe 152 is connected to a second branch pipe 155. The air filling main pipe 152, the first branch pipe 153 and the second branch pipe 155 are all pressure-resistant pipes. The second branch pipe 155 follows the filling pipe 10 deep into the ground. The first branch pipe 153 is equipped with a first inflation valve 154, and the second branch pipe 155 is connected to the second inflation valve 155. A second inflation valve 156 is installed on the branch pipe 155. The first inflation valve 154 and the second inflation valve 156 are used to intercept the flow in the first branch pipe 153 and the second branch pipe 155 respectively. When the slurry is filled in the filling pipe 10, the first inflation valve 154 and the second inflation valve 156 are both in a closed state. The air inlet of the high-pressure air pump 151 is connected to the compressed gas generator 157, and the compressed gas produced by the compressed gas generator 157 is passed into the inflation main pipe 152 through the high-pressure air pump 151.

[0039] The air negative pressure system 16 includes a vacuum pump 161, and an intake pipe 162 is connected between the air inlet of the vacuum pump 161 and the filling pipe 10. The air outlet of the vacuum pump 161 is connected to the external environment. The vacuum pump 161 is a pump with an exhaust function. An intake valve 163 is installed on the intake pipe 162 for intercepting the intake pipe 162. It is in a closed state when the slurry is filled in the filling pipe 10.

[0040] Specifically, the inflation main pipe 152 is connected to the above-ground part of the filling pipe 10 through the first branch pipe 153, and the second branch pipe 155 is inserted into the ground. The inflation main pipe 152 is connected to the underground part of the filling pipe 10 close to the goaf 11 through the second branch pipe 155. The high-pressure inflation pump 151 applies positive pressure to the top of the flushing water through the inflation main pipe 152 and the first branch pipe 153. The high-pressure inflation pump 151 applies positive pressure to the bottom of the flushing water through the inflation main pipe 152 and the second branch pipe 155.

[0041] Furthermore, the vacuum pump 161 is connected to the filling pipe 10 through the suction pipe 162, and the vacuum pump 161 applies negative pressure to the top of the flushing water in the filling pipe 10 through the suction pipe 162. The air negative pressure system 16 and the air positive pressure system 15 are both installed on the side wall of the filling pipe 10 between the upper shut-off valve 13 and the lower shut-off valve 14. The flushing water is driven upstream by the upward squeezing of compressed gas and the upward suction of vacuum, and the flushing water is driven downstream by the downward squeezing of compressed gas and the downward flow of flushing water due to gravity. The water flow is repeatedly made to flow up and down in the filling pipe 10, and the inner wall of the filling pipe 10 is flushed multiple times. The flushing force of the water flow in the filling pipe 10 is enhanced by the squeezing of compressed gas, vacuum suction and the downward fall of water flow due to gravity, so that the water flow has a better cleaning effect on the inner wall of the filling pipe 10, and the high impact force generated by the pressurized water flow can effectively remove the stubborn slurry particles remaining on the pipe wall.

[0042] Furthermore, the recycling system 17 includes a recycling box 171 installed on the ground, a drainage pipe 172 is connected to the top of the recycling box 171, the water flow direction of the drainage pipe 172 is from the filling pipe 10 toward the recycling box 171, a drainage pump 173 is installed on the drainage pipe 172, and a drainage valve 174 is installed on the drainage pipe 172 on the side of the drainage pump 173 close to the filling pipe 10 for intercepting the drainage pipe 172. When the filling pipe 10 is filled with slurry, the drainage valve 174 is closed, and the side wall of the recycling box 171 is connected to the water inlet pipe 175, and the water flow direction of the water in the water inlet pipe 175 is from the recycling box 171 toward the filling pipe 10. A water inlet pump 176 is installed on the water inlet pipe 175. A water inlet valve 178 is installed on the water inlet pipe 175 on the side of the water inlet pump 176 close to the filling pipe 10, which is used to intercept the water inlet pipe 175. When the filling pipe 10 is filled with slurry, the water inlet valve 178 is closed. A flow meter 177 is installed on the water inlet pipe 175 between the water inlet pump 176 and the water inlet valve 178. When the water in the water storage chamber 1713 in the recovery box 171 is introduced into the filling pipe 10 through the water inlet pipe 175 for secondary flushing, the flow rate of the incoming water is controlled by using the flow meter 177 to keep the water flow consistent with the initial flushing.

[0043] Furthermore, a filter screen 1711 is installed inside the recovery box 171 for solid-liquid separation of the flushing sewage. The filter screen 1711 separates the inner cavity of the recovery box 171 into a slurry stirring chamber 1712 and a water storage chamber 1713 arranged up and down. A rotating shaft 1714 is installed in the middle of the slurry stirring chamber 1712. A bearing 1715 is installed between the bottom of the rotating shaft 1714 and the filter screen 1711. The top of the rotating shaft 1714 extends from the upper surface of the recovery box 171 and is connected to a motor 1717. The motor 1717 is installed on the upper surface of the recovery box 171. A slurry discharge port 1717 is provided on the side wall of the recovery box 171 on one side of the slurry stirring chamber 1712. 718 is used to discharge the slurry particles in the slurry stirring chamber 1712. If the slurry does not lose its coagulation effect after contacting water, the filtered slurry particles can be taken out and concentrated for subsequent filling. If the slurry loses its coagulation effect, the slurry particles can be used as solid waste after drying. The outer side of the slurry discharge port 1718 is connected to a guide plate 1719, and the inside of the slurry discharge port 1718 is movably connected with a baffle 17110. The top of the baffle 17110 is connected to an electric push rod 17111. The electric push rod 17111 is extended to push the baffle 17110 upward and draw it out from the slurry discharge port 1718, so that the slurry particles can be discharged from the slurry discharge port 1718 conveniently.

[0044] Furthermore, one side of the drain pipe 172 is connected to the filling pipe 10, and the other side of the drain pipe 172 is connected to the slurry stirring chamber 1712 in the recovery box 171. One end of the water inlet pipe 175 is connected to the water storage chamber 1713 in the recovery box 171, and the other end of the water inlet pipe 175 is connected to the filling pipe 10. The water filtered by the filter 1711 flows into the water storage chamber 1713 for collection. When the filling pipe 10 is cleaned for the second time, the water inlet valve 178 is opened, and the water filtered out of the water storage chamber 1713 is re-introduced into the filling pipe 10 by the water inlet pump 176 for reuse, thereby achieving the effect of recycling and filtering the flushing sewage and reusing it for flushing the filling pipe 10.

[0045] Furthermore, a stirring rod 1716 is connected to the outer wall of the rotating shaft 1714, and the stirring rod 1716 and the rotating shaft 1714 are rotatably connected to the recovery box 171 via the bearing 1715. When the flushing sewage is filtered on the filter screen 1711, the slurry particles deposited therein are likely to clog the filter screen 1711. The rotating shaft 1714 is driven to rotate by the motor 1717, and the rotating shaft 1714 drives the stirring rod 1716 to stir the slurry particles. On the one hand, the slurry particles are stirred to maintain the filtration efficiency, and on the other hand, the slurry particles are prevented from clumping on the filter screen 1711.

[0046] A method for filling a paste of an underground metal ore, which adopts the above-mentioned underground metal ore paste filling system, comprises the following steps:

[0047] S1: Open the water tank 9, introduce a certain amount of clean water into the mixer 7, and open the bottom valve of the mixer 7, as well as the upper shut-off valve 13 and the lower shut-off valve 14. The filling pump 12 allows clean water to be introduced into the filling pipe 10 to preliminarily clean the filling pipe 10 and remove the air in the filling pipe 10;

[0048] Flushing the filling pipe 10 with water before filling can expel the air in the pipe, keep the pipe full at all times, and moisten the inner wall of the filling pipe 10 to reduce filling obstruction. In this step, the water flow that moistens the pipe eventually flows into the goaf 11.

[0049] S2: Open the fly ash bin 5 and the gangue bin 1 to feed a fixed ratio of fly ash and gangue into the crusher 2. The crusher 2 processes the fly ash and gangue to form aggregates, and the first conveyor 3 transfers the aggregates to the buffer bin 4 for storage.

[0050] S3: Open the buffer bin 4, the water bin 9 and the cementitious material bin 8, and introduce fixed proportions of aggregate, cementitious material and water into the mixer 7. The mixer 7 mixes the aggregate, cementitious material and water to form a slurry.

[0051] S4: After the material is discharged from the bottom of the mixer 7, the filling pump 12 passes the slurry into the filling pipe 10. The slurry flows in the filling pipe 10 until it passes into the goaf 11 behind the working face.

[0052] S5: After the slurry filling is completed, the lower throttle valve is closed, the water tank 9 is opened to introduce a certain amount of clean water into the mixer 7, the clean water flushes out the residual slurry on the inner wall of the mixer 7, and the filling pump 12 introduces the water into the filling pipe 10, and then the upper shut-off valve 13 is closed.

[0053] The initial flushing water comes from the water tank 9, so the slurry residue in the mixer 7 must also be flushed out. The flow of the initial flushing water is controlled according to the actual length and inner diameter of the filling pipe 10. It is necessary to keep the flushing water in the filling pipe 10 between the upper shut-off valve 13 and the lower shut-off valve 14 occupying less than two-thirds of the total volume to provide sufficient impact space for the water flow to flush back and forth.

[0054] S6: When water flows in the filling pipe 10, some slurry residues on the inner wall of the filling pipe 10 are removed, and the suction valve 163 and the second inflation valve 156 are opened. The compressed gas produced by the compressed gas generator 157 of the high-pressure inflation pump 151 is introduced into the underground part of the filling pipe 10 through the inflation main pipe 152 and the second branch pipe 155. At the same time, the vacuum pump 161 sucks the above-ground part of the filling pipe 10 through the suction pipe 162, and the water is pushed to flow upward in the filling pipe 10 by the upper suction and lower inflation method.

[0055] S7: Close the second inflation valve 156 and the suction valve 163, open the first inflation valve 154, the vacuum pump 161 stops suction and starts exhausting, and at the same time, the compressed gas produced by the compressed gas generator 157 of the high-pressure inflation pump 151 is introduced into the above-ground part of the filling pipe 10 through the inflation main pipe 152 and the first branch pipe 153, and the water is pushed downward in the filling pipe 10 by the driving effect of the upper inflation and the tendency of the water to flow downward due to gravity.

[0056] S8: Repeat S6 and S7 multiple times to drive the water flow to flow up and down in the filling pipe 10. The water flow is driven by positive and negative pressure to enhance the impact effect, thereby removing the slurry residue on the inner wall of the filling pipe 10.

[0057] S9: After flushing is completed, the first air filling valve 154 is closed, the drain valve 174 is opened, and the drain pump 173 discharges the sewage in the filling pipe 10 into the recovery box 171 through the drain pipe 172 on the ground.

[0058] S10: The sewage entering the recovery box 171 is filtered through the filter 1711 in the slurry stirring chamber 1712, the slurry particles remain on the filter 1711, and the water flows into the water storage chamber 1713 for collection. When the filling pipe 10 is cleaned for the second time, the water inlet valve 178 is opened, and the water filtered out of the water storage chamber 1713 is re-introduced into the filling pipe 10 by the water inlet pump 176 for reuse.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A metal ore paste filling system for underground mining, comprising a goaf (11), a gangue bin (1), a fly ash bin (5), a crusher (2) installed below the gangue bin (1) and the fly ash bin (5), a buffer bin (4) installed on one side of the crusher (2), a first conveyor (3) connected between the crusher (2) and the buffer bin (4), a mixer (7) installed below the buffer bin (4), a second conveyor (6) connected between the buffer bin (4) and the mixer (7), a cementing material bin (8) installed above the mixer (7), a water tank (9) installed on one side of the mixer (7), a filling pipe (10) connected to the bottom of the mixer (7), and a filling pump (12) installed on the filling pipe (10), characterized in that: An upper shut-off valve (13) is installed on the filling pipe (10) below the filling pump (12), a lower shut-off valve (14) is installed on the filling pipe (10) on the side of the goaf (11), a side wall of the filling pipe (10) below the upper shut-off valve (13) is connected to an air negative pressure system (16), a side wall of the filling pipe (10) below the air negative pressure system (16) is connected to a circulation recovery system (17), and a side wall of the filling pipe (10) below the circulation recovery system (17) is connected to an air positive pressure system (15); The positive air pressure system (15) comprises a high-pressure air pump (151) installed on the ground, the air outlet of the high-pressure air pump (151) is connected to an air charging main pipe (152), one side of the air charging main pipe (152) is connected to a first branch pipe (153), the bottom of the air charging main pipe (152) is connected to a second branch pipe (155), a first air charging valve (154) is installed on the first branch pipe (153), a second air charging valve (156) is installed on the second branch pipe (155), and an air inlet of the high-pressure air pump (151) is connected to a compressed gas generator (157); The negative air pressure system (16) comprises a vacuum pump (161), an air intake pipe (162) is connected between the air inlet of the vacuum pump (161) and the filling pipe (10), and an air intake valve (163) is installed on the air intake pipe (162).

2. The underground mining metal ore paste filling system according to claim 1, characterized in that: The main gas charging pipe (152) is connected to the above-ground portion of the filling pipe (10) via a first branch pipe (153), and the second branch pipe (155) is inserted into the ground. The main gas charging pipe (152) is connected to the underground portion of the filling pipe (10) near the goaf (11) via the second branch pipe (155).

3. The underground mining metal ore paste filling system according to claim 2, characterized in that: The vacuum pump (161) is connected to the filling pipe (10) via the suction pipe (162), and the air negative pressure system (16) and the air positive pressure system (15) are both installed on the side wall of the filling pipe (10) between the upper shut-off valve (13) and the lower shut-off valve (14).

4. The underground mining metal ore paste filling system according to claim 3, characterized in that: The recycling system (17) comprises a recycling box (171) installed on the ground, the top of the recycling box (171) is connected to a drainage pipe (172), a drainage pump (173) is installed on the drainage pipe (172), a drainage valve (174) is installed on the drainage pipe (172) on the side of the drainage pump (173) close to the filling pipe (10), a water inlet pipe (175) is connected to the side wall of the recycling box (171), a water inlet pump (176) is installed on the water inlet pipe (175), a water inlet valve (178) is installed on the water inlet pipe (175) on the side of the water inlet pump (176) close to the filling pipe (10), and a flow meter (177) is installed on the water inlet pipe (175) between the water inlet pump (176) and the water inlet valve (178).

5. The underground mining metal ore paste filling system according to claim 4, characterized in that: A filter screen (1711) is installed inside the recovery box (171), and the filter screen (1711) separates the inner cavity of the recovery box (171) into a slurry stirring chamber (1712) and a water storage chamber (1713) arranged in an upper and lower manner. A rotating shaft (1714) is installed in the middle of the slurry stirring chamber (1712), and a bearing (1715) is installed between the bottom of the rotating shaft (1714) and the filter screen (1711). The top of the rotating shaft (1714) is provided with a bearing (1715). A motor (1717) extends from the upper surface of the recovery box (171) and is connected to the motor. A slurry discharge port (1718) is provided through the side wall of the recovery box (171) on one side of the slurry stirring chamber (1712). A material guide plate (1719) is connected to the outside of the slurry discharge port (1718). A baffle (17110) is movably inserted into the interior of the slurry discharge port (1718). An electric push rod (17111) is connected to the top of the baffle (17110).

6. The underground mining metal ore paste filling system according to claim 5, characterized in that: One side of the drainage pipe (172) is in communication with the filling pipe (10), and the other side of the drainage pipe (172) is in communication with the slurry stirring chamber (1712) in the recovery box (171). One end of the water inlet pipe (175) is in communication with the water storage chamber (1713) in the recovery box (171), and the other end of the water inlet pipe (175) is in communication with the filling pipe (10).

7. The underground mining metal ore paste filling system according to claim 6, characterized in that: The outer wall of the rotating shaft (1714) is connected to a stirring rod (1716), and the stirring rod (1716) and the rotating shaft (1714) are rotatably connected to the recovery box (171) via a bearing (1715).

8. A method for filling underground metal ore paste, characterized in that: The method adopts the underground mining metal ore paste filling system according to claim 7, and the method comprises the following steps: S1: Open the water tank (9), introduce a fixed amount of clean water into the mixer (7), open the bottom valve of the mixer (7), and open the upper shut-off valve (13) and the lower shut-off valve (14), and let the clean water flow into the filling pipe (10) through the filling pump (12), preliminarily clean the filling pipe (10) and remove the air in the filling pipe (10); S2: opening the fly ash bin (5) and the coal gangue bin (1) to introduce a fixed ratio of fly ash and coal gangue into the crusher (2); the crusher (2) processes the fly ash and coal gangue to form aggregates; and the first conveyor (3) transports the aggregates to the buffer bin (4) for storage; S3: opening the buffer bin (4), the water bin (9) and the cementing material bin (8), introducing aggregate, cementing material and water in a fixed ratio into the mixer (7), and the mixer (7) mixes the aggregate, cementing material and water to form a slurry; S4: After the mixer (7) is opened to discharge the material, the filling pump (12) passes the slurry into the filling pipe (10), and the slurry flows in the filling pipe (10) until it enters the goaf (11) behind the working face; S5: After the slurry filling is completed, the lower throttle valve is closed, the water tank (9) is opened, and a fixed amount of clean water is introduced into the mixer (7). The clean water flushes out the residual slurry on the inner wall of the mixer (7), and the water is introduced into the filling pipe (10) by the filling pump (12), and then the upper shut-off valve (13) is closed; S6: When water flows in the filling pipe (10), the slurry residue on the inner wall of the filling pipe (10) is removed, and the suction valve (163) and the second inflation valve (156) are opened. The compressed gas produced by the high-pressure inflation pump (151) through the compressed gas generator (157) is introduced into the underground part of the filling pipe (10) through the inflation main pipe (152) and the second branch pipe (155). At the same time, the vacuum pump (161) sucks the above-ground part of the filling pipe (10) through the suction pipe (162). The water is pushed to flow upward in the filling pipe (10) by means of upper suction and lower inflation; S7: The second inflation valve (156) and the suction valve (163) are closed, and the first inflation valve (154) is opened. The vacuum pump (161) stops suctioning and starts exhausting. At the same time, the compressed gas produced by the high-pressure inflation pump (151) through the compressed gas generator (157) is introduced into the above-ground portion of the filling pipe (10) through the inflation main pipe (152) and the first branch pipe (153). The water is pushed downward in the filling pipe (10) by the driving effect of the inflation and the downward flow of the water due to gravity. S8: Repeat S6 and S7 multiple times to drive the water flow to flow up and down in the filling pipe (10). The water flow is driven by positive and negative pressure to enhance the impact effect, thereby removing the slurry residue on the inner wall of the filling pipe (10); S9: After the flushing is completed, the first air filling valve (154) is closed, the drain valve (174) is opened, and the drain pump (173) discharges the sewage in the filling pipe (10) into the recovery box (171) through the drain pipe (172) on the ground; S10: The sewage entering the recovery box (171) is filtered through the filter (1711) in the slurry stirring chamber (1712), and the slurry particles remain on the filter (1711). The water flows into the water storage chamber (1713) for collection. When the filling pipe (10) is cleaned for the second time, the water inlet valve (178) is opened, and the water filtered out of the water storage chamber (1713) is re-introduced into the filling pipe (10) by the water inlet pump (176) for reuse.

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