A mine tailings paste filling system and method

Abstract

The present invention provides a mine tailings paste filling system and method. The mine tailings paste filling system includes an underground goaf, a ball bin, a filling pipeline, a material making machine and a pumping device connected to the material making machine. The filling pipeline connects the pumping device and the underground goaf. A plurality of first balls are arranged in the ball bin. The diameter of the first balls is consistent with the inner diameter of the filling pipeline. The ball bin is connected to the filling pipeline through a first pipeline. The first balls can enter the filling pipeline from the first pipeline and are located in the lower section of the pumping device. The present invention arranges a first ball with the same inner diameter as a plug in the filling pipeline, so that the slurry falls with the first ball, thereby realizing positive pressure full pipe flow transportation and effectively reducing negative pressure air resistance blockage during downward transportation.

Description

Technical Field

[0001] The invention relates to the technical field of mining filling, and in particular to a mine full tailings paste filling system and method. Background Art

[0002] At present, backfill mining is the main mining method to ensure safe production in mines and treat solid waste in mines. When backfill mining is applied, a backfill system must be built to enable the mine to backfill the stope.

[0003] The existing filling systems include dry filling, water-sand filling, graded tailings filling and full tailings paste filling. Among them, full tailings paste filling has been widely promoted and applied because it can handle large-scale mining solid waste, effectively ensure the safety of mining sites, and has less pollution to groundwater.

[0004] The existing full tailings paste filling system mainly includes a thickener, a gelling material bin, a mixer, a pumping device and a filling pipeline. The thickener and the gelling material bin are connected to the mixer, the mixer is connected to the pumping device, and the filling pipeline is connected to the pumping device and the underground goaf. The slurry in the thickener and the gelling material bin is mixed evenly by the mixer, and then transported to the underground goaf by the pumping device for filling. Because the filling pipeline has a bent downward section, the slurry falls too fast under the action of gravity when it falls downward, forming an air blockage, causing the filling pipeline to be blocked, affecting the normal pumping of the slurry. Summary of the invention

[0005] The object of the present invention is to provide a mine tailings paste filling system and method which can effectively reduce negative pressure air resistance blockage during downward transportation.

[0006] The technical solution of the present invention is: a mine tailings paste filling system, including an underground goaf, a ball bin, a filling pipeline, a material making machine and a pumping equipment connected to the material making machine, the filling pipeline connects the pumping equipment and the underground goaf, a plurality of first balls are arranged in the ball bin, the diameter of the first balls is consistent with the inner diameter of the filling pipeline, the ball bin is connected to the filling pipeline through a first pipeline, the first balls can enter the filling pipeline from the first pipeline and are located in the lower section of the pumping equipment.

[0007] In the above scheme, a first ball with the same inner diameter as the filling pipe is set as a plug, so that the slurry falls together with the first ball, realizing positive pressure full pipe flow transportation, and effectively reducing negative pressure air resistance blockage during downward transportation.

[0008] The full-pipe conveying means that when paste slurry is conveyed in a mine, a full-pipe plug is used to block the front end of the paste slurry, so that when the paste filling slurry is conveyed in the filling pipeline (especially when conveyed downward), the front end is isolated from the air and no exchange occurs, and no slurry falls freely to cause cavitation and pipe blockage.

[0009] Preferably, the mine tailings paste filling system also includes an air compressor and a pressurizing chamber, the pressurizing chamber is connected to the first pipeline, the air compressor is connected to the pressurizing chamber through a pipeline, and a second valve is provided on the first pipeline, and the second valve is located between the outlet of the pressurizing chamber and the filling pipeline.

[0010] Preferably, the mine tailings paste filling system further comprises a high-pressure water tank, a second pipeline and a third pipeline, wherein the high-pressure water tank is connected to the pressurization tank through the second pipeline, one end of the third pipeline is connected to the second pipeline, and the other end of the third pipeline is located between the pumping equipment and the first pipeline and is connected to the filling pipeline. The water in the high-pressure water tank is pressurized to hundreds of atmospheres or more by specific equipment.

[0011] Preferably, a first valve is provided on the third pipeline, and a second three-way valve is provided between the second pipeline and the third pipeline.

[0012] Preferably, there are multiple ball bins, the first ball is placed in one of the ball bins, and multiple second balls are placed in the remaining ball bins, the diameter of the second ball is smaller than the diameter of the first ball, and each ball bin is connected to the first pipe through a fourth pipe.

[0013] Preferably, a first three-way valve is connected between three adjacent fourth pipelines and between the fourth pipeline and the first pipeline.

[0014] Preferably, the filling pipeline includes a first horizontal section, a lifting section, a second horizontal section and a bending section connected in sequence, the first horizontal section is connected to the pumping equipment, the bending section is connected to the underground goaf, the lifting section is inclined upward so that the second horizontal section is higher than the first horizontal section, and the first pipeline is connected to the first horizontal section.

[0015] Preferably, a water level warning device is provided on the first horizontal section, the water level warning device is placed between the first pipeline and the lifting section, and a third valve is provided on the water level warning device.

[0016] The present invention also provides a mine tailings paste filling method, which is performed using the above-mentioned mine tailings paste filling system, and comprises: Step 1, opening the ball bin to release a first ball into the filling pipe; Step 2, pushing the first ball to the lower section of the filling pipe located at the first pipe; Step 3, starting the material making machine to make full tailings paste filling slurry; Step 4, start the pumping equipment to start pumping; the slurry contacts the first ball in the filling pipe and pushes the first ball to move in the filling pipe until it falls into the underground goaf for filling.

[0017] Preferably, an upwardly inclined lifting section is provided on the filling pipe, and in step two, high-pressure water is used to push the first ball to the lifting section.

[0018] Compared with the related art, the present invention has the following beneficial effects: 1. When the filling slurry is initially transported in the mine tailings paste filling system, a first ball with the same inner diameter as the filling pipe is used as a plug, so that the filling slurry is transported in the filling pipe with a positive pressure and full pipe flow, effectively reducing or even avoiding negative pressure air resistance during downward transportation; Second, the mine tailings paste filling system is provided with a plurality of second balls with a diameter smaller than that of the first ball. When the filling pipe is washed after the filling is completed, the second ball is driven by the high-pressure gas and water flow to flow at a high speed in the filling pipe, and the high-speed movement of the second ball is used to collide and wash the stubborn condensate on the wall of the filling pipe, so as to efficiently clean the stubborn condensate on the wall of the filling pipe; 3. Set a lifting section in the filling pipe to prevent the first ball from being pushed down directly and affecting the filling of the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the mine tailings paste filling system provided by the present invention.

[0020] In the attached figure: 1. thickener; 2. silo; 3. mixer; 4. pumping equipment; 5. ball silo; 6. pressurizing silo; 7. air compressor; 8. high-pressure water silo; 9. filling pipeline; 91. first horizontal section; 92. lifting section; 93. second horizontal section; 94. bending section; 10. second valve; 11. first three-way valve; 12. first valve; 13. water level warning device; 14. exhaust valve; 15. filter bag; 16. first pipeline; 17. second pipeline; 18. third pipeline; 19. second three-way valve; 20. underground goaf; 21. third valve; 22. material making machine; 23. fourth pipeline. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0022] like Figure 1 As shown, a mine tailings paste filling system provided in this embodiment includes a pumping equipment 4, a spherical bin 5, a pressurizing bin 6, an air compressor 7, a high-pressure water bin 8, a filling pipeline 9, a second valve 10, a first three-way valve 11, a first valve 12, a water level warning device 13, an exhaust valve 14, a filter bag 15, a first pipeline 16, a second pipeline 17, a third pipeline 18, a second three-way valve 19, an underground goaf 20, a third valve 21 and a material making machine 22.

[0023] The material making machine 22 includes a thickener 1, a silo 2 and a mixer 3. The thickener 1 and the silo 2 are connected to the mixer 3, and the mixer 3 is connected to the pumping equipment 4. The filling pipeline 9 includes a first horizontal section 91, a lifting section 92, a second horizontal section 93 and a bending section 94 connected in sequence. The first horizontal section 91 is connected to the pumping equipment 4, and the bending section 94 is connected to the underground goaf 20. The lifting section 92 is inclined upward (the gentle slope lifting angle is about 30°~45°) so that the second horizontal section 93 is higher than the first horizontal section 91.

[0024] In this embodiment, there are multiple spherical silos 5, which are silos with a conical bottom and a volume of about 1-2 m 3 . Among the multiple ball bins 5, one of the ball bins 5 is used to place multiple first balls, and the diameter of the first balls is consistent with the inner diameter of the filling pipe 9. The remaining ball bins 5 are used to place second balls for cleaning. The diameters of the second balls can be different, and they are packed in different ball bins 5 according to the diameter specifications. The first balls and the second balls are hollow steel balls. The diameters of the first balls and the second balls are in multiple relationship, and the diameter of the first ball is the largest.

[0025] Each of the ball bins 5 is connected to the first pipe 16 through the fourth pipe 23, and the first pipe 16 is connected to the first horizontal section 91 of the filling pipe 9. A first three-way valve 11 is connected between three adjacent fourth pipes 23 and between the fourth pipe 23 and the first pipe 16. A pressurizing bin 6 and a second valve 10 are provided on the first pipe 16, and the second valve 10 is located at the outlet of the pressurizing bin 6.

[0026] The air compressor 7 is connected to the pressurizing bin 6 through a pipeline, so as to deliver the first ball or the second ball in the ball bin 5 to the filling pipe 9 by pressurizing.

[0027] The high-pressure water tank 8 is connected to the pressurized tank 6 through the second pipe 17. One end of the third pipe 18 is connected to the second pipe 17, and the other end of the third pipe 18 is located between the pumping device 4 and the first pipe 16 and is connected to the filling pipe 9. The third pipe 18 is provided with a first valve 12, and a second three-way valve 19 is provided between the second pipe 17 and the third pipe 18.

[0028] The first horizontal section 91 is provided with an exhaust valve 14 and a water level warning device 13. The exhaust valve 14 is provided close to the pumping device 4. The water level warning device 13 is placed between the first pipeline 16 and the lifting section 92. The water level warning device 13 is composed of a vertically upward pipeline and a third valve 21 provided on the pipeline, and the top elevation of the pipeline is 0.1-0.2 m lower than the top elevation of the lifting section 92.

[0029] The present invention also provides a mine tailings paste filling method, which is performed using the above-mentioned mine tailings paste filling system and comprises the following steps: S1, before filling, respectively open the ball bin 5 where the first ball is placed to release the first ball, and open the first three-way valve 11 to allow the first ball to enter the pressurized bin 6 of the first pipeline 16; S2, start the air compressor 7 and open the second valve 10 on the first pipeline 16, the first ball enters the filling pipeline 9 from the pressurizing chamber 6, and the second valve 10 is closed; S3, respectively open the third valve 21 on the water level warning device 13, the second three-way valve 19 on the second pipe 17, the second valve 10 on the third pipe 18 and the exhaust valve 14; the high-pressure water in the high-pressure water tank 8 enters the first horizontal section 91 through the second pipe 17 and the third pipe 18 in sequence, and is pushed to the first ball in the filling pipe 9 to the lifting section 92; S4, when the exhaust valve 14 discharges water, close the exhaust valve 14; when the water level warning device 13 discharges water, close the third valve 21, and simultaneously close the second valve 10 and the second three-way valve 19; S5, start the material making machine 22, at this time, the thickener 1 and the silo 2 (containing the cementitious material) are discharged to the mixer 3 and mixed into a full tailings paste filling slurry; S6, start the pumping device 4, and pump the stirred slurry into the filling pipe 9; at this time, the slurry contacts the first ball in the lifting section 92, and the first ball is used as a plug to achieve full pipe flow transportation, so that the slurry and the first ball are transported along the filling pipe 9 to the underground goaf 20 for filling, thereby preventing the slurry from falling and forming a blockage during downward transportation; S7, after the filling is completed, the first three-way valve 11 on the fourth pipe 23 of the remaining ball bins 5 is opened to release a certain number of second balls into the pressurizing bin 6, and the air compressor 7 and the second three-way valve 19 are opened to add high-pressure water and high-pressure gas to the pressurizing bin 6 respectively. After the pressure in the pressurizing bin 6 reaches a certain level, the second valve 10 is opened, and the high-pressure water flow drives the second balls to flush the filling pipe 9; In step S7, a second ball with a small diameter can be used to mix with wind and water to flush the pipeline, gradually flushing and expanding the blockage of stubborn condensation, and then the ball bin 5 where the second ball with a small diameter is placed can be closed; then a second ball with a larger diameter can be released, and the pipeline can be flushed with mixed wind and water in the same way to further flush and expand the diameter of the blockage, and the above steps can be repeated until the blockage is completely flushed.

[0030] In order to recover the second ball, a filter bag 15 is arranged at the end of the bent section 94 of the filling pipe 9 located in the underground goaf 20 .

[0031] The present invention aims at the problem that the filling slurry of the current mine tailings paste filling system is easy to fall during the downward transportation, causing air blockage, siltation and pipe blockage. After the filling is completed, the stubborn condensate attached to the wall of the filling pipe cannot be quickly and efficiently cleaned, causing siltation and even pipe blockage. By designing the mine tailings paste filling system of the present invention, full pipe flow transportation with plugs is achieved to avoid air blockage and siltation during the downward transportation of the filling slurry. After the filling is completed, the second balls of different diameters are driven by high-pressure gas and water to collide with the stubborn condensate on the wall of the filling pipe 9 in a distributed flushing manner, so as to achieve the purpose of efficiently cleaning the filling pipe 9, thereby effectively reducing or even avoiding silt blockage in the filling pipe 9.

[0032] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A mine tailings paste filling system, comprising an underground goaf (20), a material making machine (22) and a pumping device (4) connected to the material making machine (22), characterized in that: It also includes a ball bin (5) and a filling pipe (9), wherein the filling pipe (9) connects the pumping equipment (4) and the underground goaf (20), wherein a plurality of first balls are arranged in the ball bin (5), wherein the diameter of the first balls is consistent with the inner diameter of the filling pipe (9), and the ball bin (5) is connected to the filling pipe (9) via a first pipe (16), wherein the first balls can enter the filling pipe (9) from the first pipe (16) and are located at the lower section of the pumping equipment (4).

2. The mine tailings paste filling system according to claim 1, characterized in that: It also includes an air compressor (7) and a pressurizing chamber (6), wherein the pressurizing chamber (6) is connected to the first pipeline (16), the air compressor (7) is communicated with the pressurizing chamber (6) through a pipeline, and the first pipeline (16) is provided with a second valve (10), and the second valve (10) is located between the outlet of the pressurizing chamber (6) and the filling pipeline (9).

3. The mine tailings paste filling system according to claim 2, characterized in that: It also comprises a high-pressure water tank (8), a second pipe (17) and a third pipe (18); the high-pressure water tank (8) is connected to the pressurized tank (6) via the second pipe (17); one end of the third pipe (18) is connected to the second pipe (17); the other end of the third pipe (18) is located between the pumping device (4) and the first pipe (16) and is connected to the filling pipe (9).

4. The mine tailings paste filling system according to claim 3 is characterized in that: The third pipeline (18) is provided with a first valve (12), and a second three-way valve (19) is provided between the second pipeline (17) and the third pipeline (18).

5. The mine tailings paste filling system according to claim 1, characterized in that: There are a plurality of ball bins (5), the first ball is placed in one of the ball bins (5), and a plurality of second balls are placed in the remaining ball bins (5), the diameter of the second balls being smaller than the diameter of the first balls, and each ball bin (5) is connected to the first pipe (16) via a fourth pipe (23).

6. The mine tailings paste filling system according to claim 5, characterized in that: A first three-way valve (11) is connected between three adjacent fourth pipelines (23) and between the fourth pipeline (23) and the first pipeline (16).

7. The mine tailings paste filling system according to claim 1, characterized in that: The filling pipeline (9) comprises a first horizontal section (91), a lifting section (92), a second horizontal section (93) and a bending section (94) which are connected in sequence, the first horizontal section (91) is connected to the pumping equipment (4), the bending section (94) is connected to the underground goaf (20), the lifting section (92) is inclined upward so that the second horizontal section (93) is higher than the first horizontal section (91), and the first pipeline (16) is connected to the first horizontal section (91).

8. The mine tailings paste filling system according to claim 7, characterized in that: A water level warning device (13) is provided on the first horizontal section (91); the water level warning device (13) is placed between the first pipeline (16) and the lifting section (92); and a third valve (21) is provided on the water level warning device (13).

9. A mine tailings paste filling method, using the mine tailings paste filling system according to any one of claims 1 to 8, characterized in that: include: Step 1, opening the ball bin (5) to release a first ball into the filling pipe (9); Step 2, pushing the first ball into the filling pipe (9) at the lower section of the first pipe (16); Step 3, starting the material making machine (22) to make a full tailings paste filling slurry; Step 4, start the pumping device (4) to start pumping; the slurry contacts the first ball in the filling pipe (9) and pushes the first ball to move in the filling pipe (9) until it falls into the underground goaf (20) for filling.

10. The method for filling the mine tailings paste according to claim 9, characterized in that: An upwardly inclined lifting section (92) is provided on the filling pipe (9). In step 2, high-pressure water is used to push the first ball to the lifting section (92).

Images