Filling slurry preparation system and preparation method thereof

Abstract

The present invention discloses a filling slurry preparation system and a preparation method thereof, wherein the preparation system comprises a thickener, an emergency tank, a stirring system, a filling pump, and a cement conveying and metering device installed at a discharge port of a cement silo, the thickener and the filling pump are both arranged on the ground, a stepped pit is dug under the ground, the stirring system is composed of a high-speed flexible mixer, the high-speed flexible mixer and the emergency tank are arranged in the pit from top to bottom, a hopper and / or a thickening slurry pump is also arranged in the pit between the high-speed flexible mixer and the emergency tank, the sand discharge port of the thickener and the delivery port of the cement conveying and metering device are both connected to the feed port of the high-speed flexible mixer, the hopper is connected between the discharge port of the high-speed flexible mixer and the filling borehole of the underground filling pipe network, and the thickening slurry pump is connected between the discharge port of the high-speed flexible mixer and the pump hopper of the filling pump. The present invention has fewer slurry preparation links, reduces the investment in plant construction, and has flexible equipment layout.

Description

Technical Field

[0001] The invention relates to the technical field of mine solid waste filling, and in particular to a filling slurry preparation system and a preparation method thereof. Background Art

[0002] At the beginning of industrial site planning, the construction plan of the filling system is often not considered. With the increasing attention paid by the state to mine environmental protection, the surface discharge of tailings has increased the economic burden of enterprises. Mines using caving or open-field production also face a series of problems. At present, the above problems are often solved by building filling stations and using tailings cementation filling mining.

[0003] Since the mine did not plan the filling system construction in the early stage, when the filling system was designed and constructed in the later stage, the mine often could not provide a sufficient area for the filling system construction, and the construction scope of the filling station was restricted. Therefore, the existing filling slurry preparation systems basically adopt the form of ground layout of thickeners and filling pumps and high-rise layout of mixing systems, such as the structure of the continuous preparation system of full-grade tailings cemented filling slurry disclosed in the authorization announcement number CN 105834012 B and the filling equipment disclosed in the authorization announcement number CN 101469614 B.

[0004] After long-term use, it is found that the existing preparation system often has the following problems during use:

[0005] 1. Because the sand outlet of the thickener is lower than the feed inlet of the mixer, the high-concentration underflow after thickening by the thickener generally needs to be pumped to the mixer by an underflow slurry pump. Because the underflow concentration of the thickener is high, in order to avoid the failure of the underflow slurry pump and affect the normal filling operation, the underflow slurry pump generally needs to be used in backup mode, which increases the equipment investment and the intermediate links, and increases the risk of normal operation of the filling system.

[0006] 2. In mines that use gravity conveying, in the traditional tailings cementation filling system, the mixing system used for filling slurry preparation generally adopts two-stage mixing to obtain better preparation effects. This not only increases the construction area of ​​the filling station, but also increases the number of mixing links, which increases energy consumption and the risk of normal operation of the filling system.

[0007] 3. In the traditional filling system, for mines that use pump pressure transportation, the filling pump is generally arranged on the ground, the second stage mixer is arranged on the first platform, and the first stage mixer is arranged on the second platform, and the filling pump is generally arranged directly below the second stage mixer. Due to the need to arrange multiple platforms, the filling station plant often needs to be built higher, which increases the investment in plant construction, the column legs of the cement silo also need to be raised accordingly, and the investment in equipment foundation increases accordingly; among the various types of equipment in the filling station, except for the filling slurry preparation system, the filling pump occupies a large size, and the location of the filling pump is limited by the location of the mixer. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies of the prior art and provide a filling slurry preparation system and preparation method thereof with fewer preparation links, smaller site construction area, lower plant construction investment, and flexible equipment layout.

[0009] The filling slurry preparation system provided by the present invention comprises a thickener, a flocculant dosing machine, an overflow water silo, an accident pool, a stirring system, a filling pump, a cement silo and a cement conveying and metering device installed at the discharge port of the cement silo. The thickener, flocculant dosing machine, overflow water silo, filling pump and cement silo are all arranged on the ground. The tailings slurry conveying pipeline of the ore dressing plant and the discharge port of the flocculant dosing machine are connected to the feed trough of the thickener. The overflow port of the thickener is connected to the overflow water silo. A stepped pit is dug under the ground. The stirring system The system consists of a high-speed flexible mixer, which and an accident pool are arranged in a pit from top to bottom. A hopper and / or a thickening pump are also arranged in the pit between the high-speed flexible mixer and the accident pool. The sand discharge port of the thickener and the delivery port of the cement conveying and metering device are all connected with the feed port of the high-speed flexible mixer, the hopper is connected between the discharge port of the high-speed flexible mixer and the filling borehole of the underground filling pipe network, and the thickening pump is connected between the discharge port of the high-speed flexible mixer and the pump bucket of the filling pump; the overflow port is arranged higher than the overflow water tank.

[0010] The preparation system also includes a homogenizing pulping device for homogenizing the slurry concentration in the thickener. The homogenizing pulping device includes an air compressor and an air storage tank arranged on the ground, and several nozzles evenly distributed at the bottom of the inner side of the thickener. The exhaust port of the air compressor is connected to each nozzle through the air storage tank.

[0011] A plurality of overflow valves connected with the overflow water tank are arranged in a stepped manner on the barrel wall of the thickener, and the overflow valves are arranged higher than the overflow water tank.

[0012] A hanging pump connected to the overflow water tank is arranged in the accident pool.

[0013] The cement silo consists of an upper cylindrical section and a lower inverted frustum section, the discharge port is located at the bottom of the inverted frustum section, and a plurality of anti-blocking nozzles are evenly distributed on the side wall of the inverted frustum section. The anti-blocking nozzles are connected to an air pump arranged on the ground through a compressed air pipeline.

[0014] A return water pump is connected to the bottom of the overflow water tank.

[0015] The preparation method provided by the present invention, which is applicable to the above filling slurry preparation system, comprises the following steps:

[0016] S1. The low-concentration tailings slurry transported from the concentrator enters the feed trough of the thickener. At the same time, the flocculant dosing machine automatically adds flocculant to the feed trough;

[0017] S2, the overflow water in the thickener is discharged into the overflow water tank through the overflow port;

[0018] S3. Before sand is released, high-pressure gas is fed into the thickener through an air compressor, a gas storage tank and a nozzle, and the high-pressure gas is used to continuously make slurry in the thickener to make the slurry concentration in the thickener uniform;

[0019] S4. After the slurry making in the thickener is completed, the sand discharge valve at the thickener discharge port is opened, and the thickener bottom flow flows into the high-speed flexible mixer through the sand discharge pipe; at this time, the cement stored in the cement silo is transported and metered by the cement transport and metering device, and then evenly added to the high-speed flexible mixer;

[0020] S5. For mines that use gravity-flow transportation of filling slurry, the filling slurry prepared in the high-speed flexible mixer flows into the hopper by gravity, and then enters the underground filling pipe network through the filling borehole; for mines that use pump pressure transportation, the filling slurry prepared in the high-speed flexible mixer is pumped by the thick slurry pump to the pump bucket of the filling pump, and then transported to the underground empty area by the filling pump through the pipe network.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention arranges the mixing system, hopper, accident pool and dense phase pump in the pit below the ground by excavating a pit, so as to realize the gravity flow of the thickener bottom flow and reliable entry into the mixing system in a short process. For mines with gravity-flowing filling slurry, the filling slurry prepared in the mixer flows into the hopper by gravity, and then enters the underground filling pipe network through the filling borehole; and for mines with pump pressure transportation, in order to avoid excessive pit excavation volume and increase the excavation work and pit support costs, the filling pump is arranged on the ground, and the filling slurry is pumped into the pump bucket of the filling pump through the thick slurry pump arranged under the mixer platform, and then the filling pump transports the slurry to the underground filling area through the pipe network. The layout is very compact, which greatly reduces the floor space of the filling station.

[0023] 2. The present invention utilizes a high-speed flexible mixer to replace the traditional two-stage mixer, thereby achieving a compact layout of the filling station, reducing intermediate links, and lowering the construction investment of the filling station while ensuring the quality of the filling slurry preparation.

[0024] 3. The present invention not only makes the filling equipment compactly arranged by excavating the pit, but also greatly reduces the floor space of the filling station and the height of the equipment layout, and the construction height of the plant can also be greatly reduced, thereby reducing the construction investment of the plant. In addition, the legs of the cement silo can also be greatly shortened, improving the stability and safety of the cement silo.

[0025] 4. In the present invention, the filling slurry prepared by the high-speed flexible mixer is pumped to the pump bucket of the filling pump through the thick slurry pump and the pipeline, which can realize the flexible selection of the location of the filling pump, and can also avoid the adverse effects such as arranging the filling pump in the pit, causing the pit size to be larger, increasing the construction investment, and the sharp turn of the filling pipeline at the front end of the filling pump to increase the pipe resistance.

[0026] The present invention has fewer slurry preparation links, reduces preparation energy consumption, and reduces the risk of filling system failure; reduces plant construction investment, has flexible equipment layout, is easy to concentrate, and is more suitable for use in mine construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of Example 1 of the filling slurry preparation system in the present invention.

[0028] Figure 2 It is a structural schematic diagram of Example 2 of the filling slurry preparation system in the present invention.

[0029] The marks and corresponding component names shown in the figure are:

[0030] 1. Tailings slurry delivery pipeline;

[0031] 2. Flocculant dosing machine; 21. Discharge port; 22. Flocculant delivery pipeline;

[0032] 3. Thickener; 31. Feed trough; 32. Overflow port; 33. Sand discharge port; 34. Overflow valve;

[0033] 4. Overflow water tank;

[0034] 5. Accident pool;

[0035] 6. High-speed flexible mixer; 61. Feeding port; 62. Discharging port;

[0036] 7. Filling pump; 71. Pump bucket;

[0037] 8. Cement silo; 81. Feeding port; 82. Cylindrical section; 83. Frustum section; 84. Anti-blocking nozzle; 85. Compressed air pipeline; 86. Air pump;

[0038] 9. Cement conveying and metering device; 91. Delivery outlet;

[0039] 10. Pit;

[0040] 11. Hopper;

[0041] 12. Thick slurry pump;

[0042] 13. Air compressor;

[0043] 14. Gas storage tank;

[0044] 15. Nozzle;

[0045] 16. Suspension pump;

[0046] 17. Return water pump;

[0047] 18. Filling the drilled hole;

[0048] 19. Cement tanker. DETAILED DESCRIPTION

[0049] Embodiment 1

[0050] from Figure 1 It can be seen that the filling slurry preparation system of the present invention includes a thickener 3 for storing and concentrating tailings slurry, a flocculant dosing machine 2 for adding flocculants into the thickener 3, an overflow water tank 4 for collecting and clarifying overflow water, an accident pool 5 for collecting accident water, a stirring system for preparing filling slurry, a filling pump 7 for pumping filling slurry, a cement silo 8 for storing cement, a cement conveying and metering device 9 for quantitatively conveying cement, a hopper 11 for buffering and conveying filling slurry, and a homogenizing slurry making device for homogenizing the slurry concentration in the thickener 3, wherein the stirring system is composed of a high-speed flexible mixer 6, and the homogenizing slurry making device includes an air compressor 13, an air storage tank 14 and a plurality of nozzles 15.

[0051] Thickener 2, flocculant dosing machine 3, overflow water tank 4, filling pump 7, cement silo 8, cement conveying and metering device 9, air compressor 13 and gas storage tank 14 are all arranged on the ground. A stepped pit 10 is dug under the ground between thickener 2 and cement 8. High-speed flexible mixer 6, hopper 11 and accident pool 5 are arranged in the pit 10 from top to bottom.

[0052] The tailings slurry conveying pipeline 1 of the concentrator is connected to the feed trough 31 of the thickener 3; the discharge port 21 of the flocculant dosing machine 2 is connected to the feed trough 31 of the thickener 3 through the flocculant conveying pipeline 22; the overflow port 32 of the thickener 3 is connected to the overflow water tank 4 through the overflow water pipe, and the overflow port 32 is arranged higher than the overflow water tank 4; the sand discharge port 33 of the thickener 3 is connected to the feed port 61 of the high-speed flexible mixer 6 through the sand discharge pipe; the cement conveying and metering device 9 is arranged at the discharge port 81 of the cement silo 8, and the cement conveying and metering device 9 is arranged at the discharge port 81 of the cement silo 8. The delivery port 91 of the device 9 is connected to the feed port 61 of the high-speed flexible mixer 6 through a mud transport pipe; the discharge port 62 of the high-speed flexible mixer 6 is connected to the hopper 11 through a slurry pipe; the hopper 11 is connected to the filling borehole 18 of the underground filling pipe network through a slurry pipe; the nozzles 15 are evenly distributed at the bottom inner side of the thickener 3, the exhaust port of the air compressor 13 is connected to the inlet of the air tank 14 through an air pipe, and the outlet of the air tank 14 is connected to each nozzle 15 through an air pipe; the mud outlet of the cement tank truck 19 is connected to the top of the cement silo 8 through a soot blowing pipe.

[0053] from Figure 1 It can also be seen that a plurality of overflow valves 34 connected to the overflow water tank 4 are arranged in a stepped manner on the barrel wall of the thickener 3 of the present invention, and the overflow valves 34 are arranged higher than the overflow water tank 4 .

[0054] from Figure 1 It can also be seen that a hanging pump 16 connected to the overflow water tank 4 is provided in the accident pool 5 of the present invention; a return water pump 17 is connected to the bottom of the overflow water tank 4, and the clarified water in the overflow water tank 4 is pumped back to the high-level water tank or tailings pond by the return water pump 17.

[0055] from Figure 1 It can also be seen that the cement silo 8 of the present invention is composed of an upper cylindrical section 82 and a lower inverted frustum section 83, the discharge port 81 is located at the bottom of the inverted frustum section, and a number of anti-blocking nozzles 84 are evenly distributed on the side wall of the inverted frustum section 86. The anti-blocking nozzles 84 are connected to an air pump 86 arranged on the ground through a compressed air pipe 85.

[0056] The filling slurry preparation system in this embodiment is suitable for mines where the filling slurry is transported by gravity.

[0057] For mines where the filling slurry is transported by gravity, the method for preparing the filling slurry of the present invention comprises the following steps:

[0058] S1, the low-concentration tailings slurry transported from the concentrator is fed into the feed tank 31 of the thickener 3 through the tailings slurry delivery pipeline 1, and at the same time, the flocculant dosing machine 2 is turned on, and the flocculant dosing machine 2 automatically adds flocculants to the feed tank 31 through the flocculant delivery pipeline 22;

[0059] S2, the overflow water in the thickener 3 is discharged into the overflow water tank 4 through the overflow port 32 and the overflow valve 34;

[0060] S3. Before sand discharge, turn on the air compressor 13. The high-pressure gas in the air compressor 13 is fed to the bottom of the inside of the thickener 3 through the gas storage tank 14 and the nozzle 15. The high-pressure gas is stirred in the thickener 3 to continuously make slurry, so that the slurry concentration in the thickener 3 is uniform.

[0061] S4, after the slurry making in the thickener 3 is completed, the sand discharge valve at the sand discharge port 33 of the thickener 3 is opened, and the bottom flow of the thickener 3 flows to the high-speed flexible mixer 6 through the sand discharge pipe; at the same time, the cement conveying and metering device 9 is opened, and the cement stored in the cement silo 8 is conveyed and metered by the cement conveying and metering device 9, and then evenly added to the high-speed flexible mixer 6;

[0062] S5. After the filling slurry in the high-speed flexible mixer 6 is prepared, the valve at the discharge port 62 at the bottom side of the high-speed flexible mixer 6 is opened, and the filling slurry prepared in the high-speed flexible mixer 6 is first discharged into the hopper 11 by gravity, and then enters the filling borehole 18 of the underground filling pipe network through the hopper 11, and then flows into the area to be filled by gravity through the underground filling pipe network.

[0063] Embodiment 2

[0064] from Figure 2 It can be seen that the difference between this embodiment and embodiment one is that a slurry pump 12 is arranged in the pit 10 between the high-speed flexible mixer 6 and the accident pool 5, and the inlet of the slurry pump 12 is connected to the discharge port 62 of the high-speed flexible mixer 6 through a slurry pipe, and the outlet of the slurry pump 12 is connected to the pump bucket 71 of the filling pump 7 through the slurry pipe.

[0065] The filling slurry preparation system in this embodiment is suitable for mines that require pump pressure transportation.

[0066] For mines that use pump pressure to transport, the method for preparing the filling slurry of the present invention comprises the following steps:

[0067] S1, the low-concentration tailings slurry transported from the concentrator is fed into the feed tank 31 of the thickener 3 through the tailings slurry delivery pipeline 1, and at the same time, the flocculant dosing machine 2 is turned on, and the flocculant dosing machine 2 automatically adds flocculants to the feed tank 31 through the flocculant delivery pipeline 22;

[0068] S2, the overflow water in the thickener 3 is discharged into the overflow water tank 4 through the overflow port 32 and the overflow valve 34;

[0069] S3. Before sand discharge, turn on the air compressor 13. The high-pressure gas in the air compressor 13 is fed to the bottom of the inside of the thickener 3 through the gas storage tank 14 and the nozzle 15. The high-pressure gas is stirred in the thickener 3 to continuously make slurry, so that the slurry concentration in the thickener 3 is uniform.

[0070] S4, after the slurry making in the thickener 3 is completed, the sand discharge valve at the sand discharge port 33 of the thickener 3 is opened, and the bottom flow of the thickener 3 flows to the high-speed flexible mixer 6 through the sand discharge pipe; at the same time, the cement conveying and metering device 9 is opened, and the cement stored in the cement silo 8 is conveyed and metered by the cement conveying and metering device 9, and then evenly added to the high-speed flexible mixer 6;

[0071] S5. After the filling slurry in the high-speed flexible mixer 6 is prepared, the valve at the discharge port 62 at the bottom side of the high-speed flexible mixer 6, the thick slurry pump 12 and the filling pump 7 are opened. The filling slurry prepared in the high-speed flexible mixer 6 is first pumped by the thick slurry pump 12 to the pump bucket 71 of the filling pump 7, and then pumped to the empty area underground by the filling pump 7 and the pipeline system.

Claims

1. A filling slurry preparation system, comprising a flocculant dosing machine (2), a thickener (3), an overflow silo (4), an accident pool (5), a stirring system, a filling pump (7), a cement silo (8) and a cement conveying and metering device (9) installed at a discharge port (81) of the cement silo, wherein the thickener, the flocculant dosing machine, the overflow silo, the filling pump and the cement silo are all arranged on the ground, the tailings slurry conveying pipeline (1) of the ore dressing plant and the discharge port of the flocculant dosing machine are connected to the feed trough (31) of the thickener, and the overflow port (32) of the thickener is connected to the overflow silo, characterized in that: A stepped pit (10) is dug under the ground. The mixing system consists of a high-speed flexible mixer (6). The high-speed flexible mixer and an accident pool are arranged in the pit from top to bottom. A hopper (11) and a thickening pump (12) are also arranged in the pit between the high-speed flexible mixer and the accident pool. The sand discharge port (33) of the thickener and the delivery port (91) of the cement conveying and metering device are connected to the feed port (61) of the high-speed flexible mixer. The hopper is connected between the discharge port of the high-speed flexible mixer and the filling borehole of the underground filling pipe network. The thickening pump is connected between the discharge port (62) of the high-speed flexible mixer and the pump bucket (71) of the filling pump. The overflow port is arranged above the overflow water tank. Several overflow valves (34) connected to the overflow water tank are arranged in a stepped manner on the barrel wall of the thickener. The overflow valves are arranged above the overflow water tank. A hanging pump (16) connected to the overflow water tank is arranged in the accident pool.

2. The filling slurry preparation system according to claim 1, characterized in that: The preparation system also includes a homogenizing pulping device for homogenizing the slurry concentration in the thickener, the homogenizing pulping device includes an air compressor (13) and an air storage tank (14) arranged on the ground, and a plurality of nozzles (15) evenly distributed at the bottom of the inner side of the thickener, and the exhaust port of the air compressor is connected to each nozzle through the air storage tank.

3. The filling slurry preparation system according to claim 2, characterized in that: The cement silo is composed of an upper cylindrical section (82) and a lower inverted truncated cone section (83). The discharge port is located at the bottom of the inverted truncated cone section. A plurality of anti-blocking nozzles (84) are evenly distributed on the side wall of the inverted truncated cone section. The anti-blocking nozzles are connected to an air pump (86) arranged on the ground through a compressed air pipeline (85).

4. The filling slurry preparation system according to claim 2, characterized in that: A water return pump (17) is connected to the bottom of the overflow water tank.

5. A method for preparing a filling slurry preparation system applicable to any one of claims 2 to 4, characterized in that The steps include: S1, the low-concentration tailings slurry transported from the concentrator enters the feed trough (31) of the thickener (3), and at the same time, the flocculant dosing machine (2) automatically adds flocculant to the feed trough; S2, the overflow water in the thickener is discharged by gravity into the overflow water tank (4) through the overflow port (32); S3, before sand is released, high-pressure gas is fed into the thickener through the air compressor (13), the gas storage tank (14) and the nozzle (15), and the high-pressure gas is used to continuously make slurry in the thickener to make the slurry concentration in the thickener uniform; S4, after the slurry making in the thickener is completed, the sand discharge valve at the thickener sand discharge port (33) is opened, and the thickener bottom flow flows by gravity through the sand discharge pipe to the high-speed flexible mixer (6); at this time, the cement stored in the cement silo (8) is evenly added to the high-speed flexible mixer after being conveyed and measured by the cement conveying and metering device (9); S5. For mines that use gravity-flowing conveying of filling slurry, the filling slurry prepared in the high-speed flexible mixer flows by gravity into the hopper (11), and then enters the underground filling pipe network through the filling borehole; for mines that use pump pressure conveying, the filling slurry prepared in the high-speed flexible mixer is pumped by the thick slurry pump (12) to the pump bucket (71) of the filling pump (7), and then is conveyed by the filling pump to the empty area underground through the pipe network.

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