Coal-based solid waste caving area treatment system and method

Abstract

The application discloses a coal-based solid waste caving area treatment system and method, which comprises a ground feeding well, an underground coarse crusher, an underground sewage pool, an underground box body; the ground feeding well is sequentially connected with an underground gangue washing buffer bin, an A continuous metering feeder, a gangue feeding belt conveyor, a high-fineness crusher, a transfer belt conveyor, a continuous screening machine, a finished gangue powder bin, the continuous screening machine is connected with a material returning belt conveyor, the material returning belt conveyor is connected with the high-fineness crusher, and the finished gangue powder bin is sequentially connected with a B continuous metering feeder and a feeder; the underground coarse crusher is sequentially connected with an underground gangue selecting buffer bin and a C continuous metering feeder; the underground sewage pool is sequentially connected with a variable frequency water supply pump, an A three-way regulating valve, an A flow meter and a feeder, and the A three-way regulating valve is connected with the underground sewage pool; the underground box body is sequentially connected with a variable frequency feeding pump, a B three-way regulating valve, a B flow meter and a feeder; and the feeder is sequentially connected with a continuous mixer, a plunger industrial pump, an underground main pipe and a caving area branch pipe.

Description

Technical Field

[0001] This invention belongs to the field of mining engineering technology, specifically relating to a coal-based solid waste collapse zone treatment system and method. Background Technology

[0002] Coal-based solid waste, represented by coal gangue, is typically used as the main raw material in paste-filled or solid-filled coal mining. Under longwall mining systems, both paste-filled and solid-filled coal mining face bottlenecks in filling capacity due to the influence of special supports for the working face and the conflict between mining and filling. If the primary objective of paste-filled and solid-filled coal mining is coal extraction, the filling process cannot meet the capacity requirements of high-yield and high-efficiency mines, limiting its widespread application and ensuring the large-scale consumption of gangue. If the primary objective of paste-filled and solid-filled coal mining is the consumption of gangue, the huge investment in longwall face filling supports reduces the economic feasibility of consuming gangue during filling, given the already limited number of working faces and capacity targets in the mine. Therefore, the method of consuming gangue by backfilling coal mining faces has the disadvantages of "high investment, low production capacity and limited application". In particular, for large mines with a capacity of tens of millions of tons with one or two faces, the contradiction between gangue processing capacity and backfilling capacity is prominent, and the problem of large-scale treatment of coal-based solid waste needs to be solved urgently. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of existing technologies in the treatment of coal gangue through gangue backfilling, which include large investment, low production capacity and limited application, and provides a coal-based solid waste collapse zone treatment system and method.

[0004] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0005] The coal-based solid waste runoff treatment system includes a surface feeding well (1), an underground coarse crusher (4), an underground sewage tank (19), and an underground enclosure (23); the surface feeding well (1) is connected to the underground washing gangue buffer silo (2), the underground washing gangue buffer silo (2) is connected to the A continuous metering feeder (3), the A continuous metering feeder (3) is connected to the gangue feeding conveyor belt (7), the gangue feeding conveyor belt (7) is connected to the high-fineness crusher (8), the high-fineness crusher (8) is connected to the transfer conveyor belt (9), and the transfer conveyor belt (9) is connected to the transfer conveyor belt (9). The underground coarse crusher (4) is connected to the underground gangue powder silo (12), which is connected to the finished gangue powder silo (12). The underground coarse crusher (4) is connected to the underground gangue selection buffer silo (5), which is connected to the underground gangue selection buffer silo (5). The feeder (6) is connected to the continuous metering feeder (6), which is connected to the gangue conveyor belt (7); the underground sewage tank (19) is connected to the variable frequency water pump (20), which is connected to the A three-way regulating valve (21), which is connected to the A flow meter (22), which is connected to the feeder (14), and the A three-way regulating valve (21) is also connected to the underground sewage tank (19); the underground housing (23) is connected to the variable frequency feed pump (24), which is connected to the variable frequency feeder belt belt (7); the underground sewage tank (19) is connected to the variable frequency feed pump (24), which is connected to the feeder belt belt belt (7); the underground sewage tank (19) is connected to the variable frequency water pump (20), which ... The feed pump (24) is connected to the B three-way regulating valve (25), the B three-way regulating valve (25) is connected to the B flow meter (26), the B flow meter (26) is connected to the feeder (14); the feeder (14) is connected to the continuous mixer (15), the continuous mixer (15) is connected to the plunger industrial pump (16), the plunger industrial pump (16) is connected to the downhole main pipeline (17), the downhole main pipeline (17) is connected to the caving zone branch pipe (18), and the caving zone branch pipe (18) is connected to the caving void zone (27).

[0006] Preferably, the feeder (14) is provided with a gangue powder channel, a water channel, an admixture channel and a material curtain pool (water and admixture share the material curtain pool); the continuous mixer (15) includes a single-stage continuous mixer and a double-stage continuous mixer (with a remote frequency conversion control interface).

[0007] Preferably, the minimum capacity of the finished gangue powder silo (12), the minimum capacity of the underground sewage tank (19), the minimum capacity of the underground box (23), and the minimum capacity of the plunger industrial pump (16) are calculated according to the following algorithm:

[0008] Minimum capacity of finished waste rock bin:

[0009] Minimum capacity of underground sewage tank:

[0010] Minimum capacity of the underground enclosure:

[0011] Minimum capacity of plunger industrial pump: Q Bmin = (L×h) c ×d c ×c1×c2×c3) / t c ;

[0012] Among them, Q Bmin -Minimum pump capacity, m 3 / h; L - Working face length, m; h c - Average mining height of the working face, m; d c - Daily progress at the working face, m / d; c1 - Working face recovery rate, %; c2 - Void rate in the caving zone, %; c3 - Void filling rate in the caving zone, %; t c -Effective pumping time, h / d; W g - Moisture content of finished gangue powder, %; C m -Preparation of gangue slurry mass concentration, %; M gmin -Minimum capacity of gangue powder silo, t; k t -Relative mass percentage of admixture, %; γ g -True density of finished gangue powder, t / m³ 3 ;γ w -True density of mine wastewater, t / m³ 3 ;γ t - True density of admixture, t / m³ 3 The admixture is a pumping agent and / or a quick-setting agent.

[0013] More preferably, the underground gangue washing buffer silo (2), gangue sorting buffer silo (5), and finished gangue powder silo (12) can be either a rock cylindrical silo or a rock rectangular silo; the A continuous metering feeder (3), C continuous metering feeder (6), and B continuous metering feeder (13) can be either a variable frequency motor speed-regulating belt metering or a speed reducer stepless speed-regulating belt metering, and have a remote control interface; the fine crusher (8) can be either a bottomless screen type or an impact type; the continuous screening machine (10) can be either a drum type or a vibrating type; the discharge end of the A three-way regulating valve (21) and the B three-way regulating valve (25) are both electric regulating valves.

[0014] The coal-based solid waste caving zone treatment method based on the above-mentioned coal-based solid waste caving zone treatment system includes the following steps:

[0015] (1) Preparation of finished gangue powder: The washed gangue on the ground enters the underground washed gangue buffer bin by gravity through the ground feeding well, and is then continuously metered and fed to the gangue feeding conveyor by the A continuous metering feeder; the gangue selected underground directly enters the underground gangue buffer bin; the gangue mined underground is crushed by the underground coarse crusher and then enters the underground gangue buffer bin, and is continuously metered and fed to the gangue feeding conveyor by the C continuous metering feeder; the gangue on the gangue feeding conveyor enters the high-fine crusher for crushing, and then enters the continuous screening machine via the transfer conveyor. The gangue on the screen is returned to the high-fine crusher for recycling crushing via the return conveyor, and the gangue under the screen directly enters the finished gangue bin; in addition, the operation system for the preparation of finished gangue powder is the same as the operation system for the coal mining production shift at the working face;

[0016] (2) Gangue powder slurry batching and mixing: Gangue powder in the finished gangue powder silo is fed into the feeder through B continuous metering feeder; sewage in the underground sewage tank is fed into the feeder through a pipeline equipped with A three-way regulating valve and A flow meter by a variable frequency water pump. By adjusting the frequency of the variable frequency water pump and the reflux opening of the three-way regulating valve, the index of A flow meter reaches the calculated value; admixtures in the underground tank are fed into the feeder through a pipeline equipped with B three-way regulating valve and B flow meter by a variable frequency feed pump. By adjusting the frequency of the variable frequency feed pump and the reflux opening of B three-way regulating valve, the index of B flow meter reaches the calculated value; all raw materials passing through the feeder enter the continuous mixer to complete batching and slurry preparation. The continuous mixer can adjust the mixing speed according to the feeding capacity by variable frequency; in addition, the underground batching and mixing operation system is the same as the working face maintenance team operation system.

[0017] (3) Gangue powder slurry pumping: The slurry mixed by the continuous mixer is pumped into the plunger industrial pump for pressurization, and then enters the caving void area through the underground main pipeline and the branch pipe of the caving area. The slurry is transported to the caving area one by one in the direction from the lower end of the working face to the upper end of the working face, together with the branch pipe of the caving area. In addition, the gangue powder slurry pumping and gangue powder slurry batching and mixing are carried out simultaneously, and the same as the working face maintenance team's operation system.

[0018] (4) Drag the branch pipe in the collapse zone: After the gap in the collapse zone is filled with gangue powder slurry, stop the batching, mixing and pumping, and drag it synchronously with the forward movement of the working face support during the coal mining shift.

[0019] Preferably, the particle size of the surface-washed gangue and the underground-selected gangue is -50mm, the particle size of the underground excavated gangue is -300mm, the particle size of the oversize material of the continuous screening machine 10 is +5mm, and the particle size of the undersize material is -5mm.

[0020] Preferably, the branch pipes in the caving zone are arranged at intervals parallel to the long wall working face, with the spacing between the branch pipes being 10-15 times the width of the working face support. The length of a single branch pipe is 1.2-1.5 times the daily advance of the working face. The branch pipes extend from the reserved holes in the base of the working face support, and the slurry outlet is located in the caving zone.

[0021] More preferably, in step (2), the gangue powder in the finished gangue powder silo is fed into the feeder via the B continuous metering feeder based on the feeding capacity calculated by the following algorithm:

[0022] Finished gangue powder feeding capacity:

[0023] The calculated value of the flow meter A in step (2) is obtained by the following algorithm:

[0024] Mine water feeding capacity:

[0025] The calculated value of the flow meter B in step (2) is obtained by the following algorithm:

[0026] Minimum capacity of admixture tank:

[0027] Among them, Q B -Designed pumping capacity, m 3 / h;Q g - Finished gangue powder feeding capacity, t / h; Q w -Water supply capacity, m 3 / h;Q t -Admixture feeding capacity, m 3 / h;W g - Moisture content of finished gangue powder, %; C m - The mass concentration of the prepared gangue slurry, %; k t -Relative mass percentage of admixture, %; γ g -True density of finished gangue powder, t / m³ 3 ;γ w -True density of mine wastewater, t / m³ 3 ;γ t - True density of admixture, t / m³ 3 .

[0028] The material flow, working process, and principle of this invention are embodied in the method steps. Compared with the prior art, this invention solves the drawbacks of paste backfilling and solid backfilling coal mining for gangue treatment. The specific beneficial effects are as follows:

[0029] 1. For handling gangue in the collapse area, no special backing support is required for the coal mining face. Traditional fully mechanized hydraulic supports can be used. Only pipe through holes need to be reserved in the support base. This has no impact on the matching of the three machines in the coal mining face and saves the cost of special supports for paste backing and solid backing.

[0030] 2. The gangue is treated in the caving area. The slurry outlet is located in the caving area. The preparation of finished gangue powder is synchronized with the coal mining production shift, and the preparation and transportation of slurry is synchronized with the maintenance shift. Coal mining production and slurry preparation and transportation are completely staggered in time and space, and do not affect each other, thus solving the contradiction between mining and filling.

[0031] 3. The underground gangue washing buffer silo, underground gangue sorting buffer silo, and finished gangue powder silo can be arranged using the existing mine shaft and tunnel engineering elevations. There are natural elevation differences, and they are completely staggered in space so as not to affect each other.

[0032] 4. An underground gangue buffer bin is set up to simultaneously handle both underground gangue and underground excavated gangue, so that gangue is not brought to the surface, thereby increasing the effective coal production of the mine.

[0033] 5. The continuous batching and mixing process is adopted, and the equipment can be arranged linearly along the tunnel, which occupies less space and height. There is no need to build a multi-story filling building. Under the same capacity conditions, it requires fewer equipment and consumes less energy than the paste filling batch mixing process.

[0034] 6. The underground station construction method allows for simultaneous implementation with the construction of new mine shafts and tunnels. Underground station construction offers greater flexibility in site selection, avoiding the limitations and difficulties in land acquisition associated with surface station construction. Compared to surface paste filling, it eliminates the risk of pipe blockage during slurry delivery via surface boreholes, ensuring higher safety.

[0035] 7. The preparation and transportation of underground slurry does not involve the addition of cement-based binders, making it a non-binder slurry preparation method with low material costs.

[0036] 8. The slurry outlet is far from the coal face and there is a natural barrier zone for the falling gangue during the shift, so the gangue slurry has little impact on the working face and is safe and reliable.

[0037] 9. The preparation of finished gangue powder is synchronized with the coal mining production shift. Under the "four-six system (three shifts for coal mining and one shift for maintenance)" work system, the preparation time is 18 hours. Under the "three-eight system (two shifts for coal mining and one shift for maintenance)" work system, the preparation time is 16 hours. The preparation time of finished gangue powder is sufficient, and small-scale equipment can be used, with less investment.

[0038] 10. The treatment of gangue in the collapse area adopts a non-cementing method, which can realize pipe-free transportation and eliminate the drawbacks of switching between multiple slurries and flushing pipelines when filling the ground with paste.

[0039] 11. A variable frequency feedwater pump and an A three-way regulating valve were installed, eliminating the adverse operating conditions of frequent start-stop of batch intermittent process water pumps. Under steady-state conditions with the variable frequency feedwater pump in its frequency range, the return water flow is further adjusted through the A three-way regulating valve, solving the problem of low-frequency instability of the feedwater pump under low-flow water supply conditions, and enabling wide-range flow regulation of water.

[0040] 12. A variable frequency feed pump and a B-type three-way regulating valve were installed, eliminating the adverse operating conditions of frequent start-stop of the admixture pump in batch-intermittent processes. Under steady-state conditions with the variable frequency feed pump in its frequency range, the admixture return flow rate is further adjusted through the B-type three-way regulating valve, solving the problem of low-frequency instability of the variable frequency feed pump under low flow conditions, and enabling wide-range flow rate adjustment of the admixture.

[0041] 13. A feeder is installed to make full use of the liquid raw material conditions of water and additives. The feeder forms a liquid raw material waterfall, which cuts off the dust escape channel of gangue powder in the continuous mixer, realizes dust removal without power, and overcomes the disadvantage of bag dust collectors where the dust collection bags become caked and sticky under humid conditions.

[0042] 14. The system equipment configuration adopts the method of determining capacity based on space, which avoids waste of equipment capacity and provides the system equipment with specificity and adaptability.

[0043] In summary, this invention provides a system and method for treating coal-based solid waste runoff areas. The system is arranged entirely underground, ensuring that the crushing and screening of gangue, the preparation of slurry, and the transportation and discharge of slurry are spatially independent. Gangue crushing is synchronized with the coal mining shift, and slurry preparation and transportation are synchronized with the maintenance shift, ensuring that they are not temporally interfering with each other. This solves the inherent drawbacks of traditional paste-filling and solid-filling methods for treating coal-based solid waste, which involve conflicts between mining and filling processes. The use of non-cemented slurry ensures low-cost treatment, unifies equipment and methods, reduces the number of systems and equipment, lowers system energy consumption and investment, and improves system efficiency and reliability. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the coal-based solid waste runoff area treatment system described in this invention.

[0045] In the diagram: 1. Surface feeding well; 2. Underground waste rock washing buffer silo; 3. A. Continuous metering feeder; 4. Underground coarse crusher; 5. Underground waste rock separation buffer silo; 6. C. Continuous metering feeder; 7. Waste rock inlet conveyor belt; 8. High-fineness crusher; 9. Transfer conveyor belt; 10. Continuous screening machine; 11. Return conveyor belt; 12. Finished waste rock powder silo; 13. B. Continuous metering feeder; 14. Feeder; 15. Continuous mixer; 16. Plunger industrial pump; 17. Underground main pipeline; 18. Branch pipe in the caving zone; 19. Underground sewage tank; 20. Variable frequency water pump; 21. A. Three-way regulating valve; 22. A. Flow meter; 23. Underground housing; 24. Variable frequency feed pump; 25. B. Three-way regulating valve; 26. B. Flow meter; 27. Cavity area. Detailed Implementation

[0046] Example 1

[0047] See Figure 1The coal-based solid waste runoff treatment system includes a surface feeding well 1, an underground coarse crusher 4, an underground sewage tank 19, and an underground enclosure 23. The surface feeding well 1 is connected to an underground washing waste buffer silo 2, which is connected to a continuous metering feeder 3 (A), which is connected to an infeed conveyor belt 7, which is connected to a fine crusher 8, which is connected to a transfer conveyor belt 9. 9 is connected to the continuous screening machine 10, which is connected to the finished product gangue powder silo 12. The continuous screening machine 10 is also connected to the return conveyor belt 11, which is connected to the high-fineness crusher 8. The finished product gangue powder silo 12 is connected to the B continuous metering feeder 13, which is connected to the feeder 14. The underground coarse crusher 4 is connected to the underground gangue selection buffer silo 5, which is connected to the C continuous... The metering feeder 6 is connected, and the C continuous metering feeder 6 is connected to the gangue feeding belt conveyor 7; the underground sewage tank 19 is connected to the variable frequency water pump 20, the variable frequency water pump 20 is connected to the A three-way regulating valve 21, the A three-way regulating valve 21 is connected to the A flow meter 22, the A flow meter 22 is connected to the feeder 14, and the A three-way regulating valve 21 is also connected to the underground sewage tank 19; the underground housing 23 is connected to the variable frequency feed pump 24, and the variable frequency feeder 25 is connected to the underground sewage tank 19. The frequency feed pump 24 is connected to the B three-way regulating valve 25, the B three-way regulating valve 25 is connected to the B flow meter 26, the B flow meter 26 is connected to the feeder 14; the feeder 14 is connected to the continuous mixer 15, the continuous mixer 15 is connected to the plunger industrial pump 16, the plunger industrial pump 16 is connected to the downhole main pipeline 17, the downhole main pipeline 17 is connected to the caving zone branch pipe 18, and the caving zone branch pipe 18 is connected to the caving void zone 27.

[0048] The feeder 14 is equipped with a gangue powder channel, a water channel, an admixture channel, and a material curtain pool where water and admixtures share a material curtain pool; the continuous mixer 15 includes a single-stage continuous mixer and a double-stage continuous mixer with a remote frequency conversion control interface.

[0049] The minimum capacity of the finished gangue powder silo 12, the minimum capacity of the underground sewage tank 19, the minimum capacity of the underground box 23, and the minimum capacity of the plunger industrial pump 16 are calculated using the following algorithm:

[0050] Minimum capacity of finished waste rock bin:

[0051] Minimum capacity of underground sewage tank:

[0052] Minimum capacity of the underground enclosure:

[0053] Minimum capacity of plunger industrial pump: Q Bmin= (L×h) c ×d c ×c1×c2×c3) / t c ;

[0054] Among them, Q Bmin -Minimum pump capacity, m 3 / h; L - Working face length, m; h c - Average mining height of the working face, m; d c - Daily progress at the working face, m / d; c1 - Working face recovery rate, %; c2 - Void rate in the caving zone, %; c3 - Void filling rate in the caving zone, %; t c -Effective pumping time, h / d; W g - Moisture content of finished gangue powder, %; C m -Preparation of gangue slurry mass concentration, %; M gmin -Minimum capacity of gangue powder silo, t; k t -Relative mass percentage of admixture, %; γ g -True density of finished gangue powder, t / m³ 3 ;γ w -True density of mine wastewater, t / m³ 3 ;γ t - True density of admixture, t / m³ 3 .

[0055] The underground gangue washing buffer bin 2, gangue sorting buffer bin 5, and finished gangue powder bin 12 can be either cylindrical or rectangular; the continuous metering feeder A 3, continuous metering feeder C 6, and continuous metering feeder B 13 can be either variable frequency motor speed-regulating belt metering or stepless speed-regulating belt metering with a reducer, and have a remote control interface; the fine crusher 8 can be either bottomless screen or impact crusher; the continuous screening machine 10 can be either drum or vibrating screen; the discharge end of the three-way regulating valve A 21 and the three-way regulating valve B 25 are both electric regulating valves.

[0056] Example 2

[0057] The coal-based solid waste caving zone treatment method based on the coal-based solid waste caving zone treatment system described in Example 1 includes the following steps:

[0058] (1) Preparation of finished gangue powder: The washed gangue on the ground enters the underground washed gangue buffer bin by gravity through the ground feeding well, and is then continuously metered and fed to the gangue feeding conveyor by the A continuous metering feeder; the gangue selected underground directly enters the underground gangue buffer bin; the gangue mined underground is crushed by the underground coarse crusher and then enters the underground gangue buffer bin, and is continuously metered and fed to the gangue feeding conveyor by the C continuous metering feeder; the gangue on the gangue feeding conveyor enters the high-fine crusher for crushing, and then enters the continuous screening machine via the transfer conveyor. The gangue on the screen is returned to the high-fine crusher for recycling crushing via the return conveyor, and the gangue under the screen directly enters the finished gangue bin; in addition, the operation system for the preparation of finished gangue powder is the same as the operation system for the coal mining production shift at the working face;

[0059] (2) Gangue powder slurry batching and mixing: Gangue powder in the finished gangue powder silo is fed into the feeder through B continuous metering feeder; sewage in the underground sewage tank is fed into the feeder through a pipeline equipped with A three-way regulating valve and A flow meter by a variable frequency water pump. By adjusting the frequency of the variable frequency water pump and the reflux opening of the three-way regulating valve, the index of A flow meter reaches the calculated value; admixtures in the underground tank are fed into the feeder through a pipeline equipped with B three-way regulating valve and B flow meter by a variable frequency feed pump. By adjusting the frequency of the variable frequency feed pump and the reflux opening of B three-way regulating valve, the index of B flow meter reaches the calculated value; all raw materials passing through the feeder enter the continuous mixer to complete batching and slurry preparation. The continuous mixer can adjust the mixing speed according to the feeding capacity by variable frequency; in addition, the underground batching and mixing operation system is the same as the working face maintenance team operation system.

[0060] (3) Gangue powder slurry pumping: The slurry mixed by the continuous mixer is pumped into the plunger industrial pump for pressurization, and then enters the caving void area through the underground main pipeline and the branch pipe of the caving area. The slurry is transported to the caving area one by one in the direction from the lower end of the working face to the upper end of the working face, together with the branch pipe of the caving area. In addition, the gangue powder slurry pumping and gangue powder slurry batching and mixing are carried out simultaneously, and the same as the working face maintenance team's operation system.

[0061] (4) Drag the branch pipe in the collapse zone: After the gap in the collapse zone is filled with gangue powder slurry, stop the batching, mixing and pumping, and drag it synchronously with the forward movement of the working face support during the coal mining shift.

[0062] The particle size of the surface-washed and underground-selected gangue is -50mm, the particle size of the underground excavated gangue is -300mm, the particle size of the oversize material of the continuous screening machine 10 is +5mm, and the particle size of the undersize material is -5mm.

[0063] The branch pipes in the caving zone are arranged at intervals parallel to the long wall working face, with a spacing of 10-15 times the width of the working face support. The length of a single branch pipe is 1.2-1.5 times the daily advance of the working face. The branch pipes extend from the pre-reserved holes in the base of the working face support, and the slurry outlet is located in the caving zone.

[0064] In step (2), the gangue powder in the finished gangue powder silo is fed into the feeder via the B continuous metering feeder. The feeding capacity is calculated based on the following algorithm:

[0065] Finished gangue powder feeding capacity:

[0066] The calculated value of the flow meter A in step (2) is obtained by the following algorithm:

[0067] Mine water feeding capacity:

[0068] The calculated value of the flow meter B in step (2) is obtained by the following algorithm:

[0069] Minimum capacity of admixture tank: Among them, Q B -Designed pumping capacity, m 3 / h;Q g - Finished gangue powder feeding capacity, t / h; Q w -Water supply capacity, m 3 / h;Q t -Admixture feeding capacity, m 3 / h;W g - Moisture content of finished gangue powder, %; C m - The mass concentration of the prepared gangue slurry, %; k t -Relative mass percentage of admixture, %; γ g -True density of finished gangue powder, t / m³ 3 ;γ w -True density of mine wastewater, t / m³ 3 ;γ t - True density of admixture, t / m³ 3 .

Claims

1. A coal-based solid waste runoff area treatment system, characterized in that, The coal-based solid waste runoff treatment system includes a surface feeding well (1), an underground coarse crusher (4), an underground sewage tank (19), and an underground enclosure (23); the surface feeding well (1) is connected to the underground washing gangue buffer silo (2), the underground washing gangue buffer silo (2) is connected to the A continuous metering feeder (3), the A continuous metering feeder (3) is connected to the gangue feeding conveyor belt (7), the gangue feeding conveyor belt (7) is connected to the high-fineness crusher (8), the high-fineness crusher (8) is connected to the transfer conveyor belt (9), and the transfer conveyor belt (9) is connected to the transfer conveyor belt (9). The underground coarse crusher (4) is connected to the underground gangue powder silo (12), which is connected to the finished gangue powder silo (12). The underground coarse crusher (4) is connected to the underground gangue selection buffer silo (5), which is connected to the underground gangue selection buffer silo (5). The feeder (6) is connected to the continuous metering feeder (6), which is connected to the gangue conveyor belt (7); the underground sewage tank (19) is connected to the variable frequency water pump (20), which is connected to the A three-way regulating valve (21), which is connected to the A flow meter (22), which is connected to the feeder (14), and the A three-way regulating valve (21) is also connected to the underground sewage tank (19); the underground housing (23) is connected to the variable frequency feed pump (24), which is connected to the variable frequency feeder belt belt (7); the underground sewage tank (19) is connected to the variable frequency feed pump (24), which is connected to the feeder belt belt belt (7); the underground sewage tank (19) is connected to the variable frequency water pump (20), which ... The feed pump (24) is connected to the B three-way regulating valve (25), the B three-way regulating valve (25) is connected to the B flow meter (26), the B flow meter (26) is connected to the feeder (14); the feeder (14) is connected to the continuous mixer (15), the continuous mixer (15) is connected to the plunger industrial pump (16), the plunger industrial pump (16) is connected to the downhole main pipeline (17), the downhole main pipeline (17) is connected to the caving zone branch pipe (18), and the caving zone branch pipe (18) is connected to the caving void zone (27).

2. The coal-based solid waste runoff area treatment system as described in claim 1, characterized in that, The feeder (14) is provided with a gangue powder channel, a water channel, an additive channel and a material curtain pool; the continuous mixer (15) includes a single-stage continuous mixer and a double-stage continuous mixer.

3. The coal-based solid waste runoff area treatment system as described in claim 1, characterized in that, The minimum capacity of the finished gangue powder silo (12), the minimum capacity of the underground sewage tank (19), the minimum capacity of the underground box (23), and the minimum capacity of the plunger industrial pump (16) are calculated according to the following algorithm: Minimum capacity of finished waste rock bin: Minimum capacity of underground sewage tank: Minimum capacity of the underground enclosure: Minimum capacity of plunger industrial pump: Q Bmin = (L×h) c ×d c ×c1×c2×c3) / t c ; Among them, Q Bmin -Minimum pump capacity, m 3 / h; L - Working face length, m; h c - Average mining height of the working face, m; d c - Daily progress at the working face, m / d; c1 - Working face recovery rate, %; c2 - Void rate in the caving zone, %; c3 - Void filling rate in the caving zone, %; t c -Effective pumping time, h / d; W g - Moisture content of finished gangue powder, %; C m -Preparation of gangue slurry mass concentration, %; M gmin -Minimum capacity of gangue powder silo, t; k t -Relative mass percentage of admixture, %; γ g -True density of finished gangue powder, t / m³ 3 ;γ w -True density of mine wastewater, t / m³ 3 ;γ t - True density of admixture, t / m³ 3 The admixture is a pumping agent and / or a quick-setting agent.

4. A method for treating coal-based solid waste caving zones based on the coal-based solid waste caving zone treatment system of claim 1, characterized in that, The method includes the following steps: (1) Preparation of finished gangue powder: The washed gangue on the ground enters the underground washed gangue buffer bin by gravity through the ground feeding well, and is then continuously metered and fed to the gangue feeding belt conveyor by the A continuous metering feeder; the gangue selected underground directly enters the underground gangue selection buffer bin; the gangue excavated underground enters the underground gangue selection buffer bin after primary crushing by the underground coarse crusher, and is then continuously metered and fed to the gangue feeding belt conveyor by the C continuous metering feeder; the gangue on the gangue feeding belt conveyor enters the high-fine crusher for crushing, and then enters the continuous screening machine via the transfer belt conveyor. The gangue on the screen is returned to the high-fine crusher for recycling crushing via the return belt conveyor, and the gangue under the screen directly enters the finished gangue bin; (2) Gangue powder slurry batching and mixing: Gangue powder in the finished gangue powder silo is fed into the feeder through B continuous metering feeder; sewage in the underground sewage tank is fed into the feeder through a pipeline equipped with A three-way regulating valve and A flow meter by a variable frequency water pump. By adjusting the frequency of the variable frequency water pump and the reflux opening of the three-way regulating valve, the index of A flow meter reaches the calculated value; admixtures in the underground tank are fed into the feeder through a pipeline equipped with B three-way regulating valve and B flow meter by a variable frequency feed pump. By adjusting the frequency of the variable frequency feed pump and the reflux opening of B three-way regulating valve, the index of B flow meter reaches the calculated value; all raw materials through the feeder enter the continuous mixer to complete batching and slurry preparation. The continuous mixer can adjust the mixing speed according to the feeding capacity by variable frequency. (3) Gangue powder slurry pumping: The slurry mixed by the continuous mixer is pumped into the plunger industrial pump for pressurization, and then enters the caving void area through the underground main pipeline and the caving zone branch pipe. The slurry is then transported to the caving zone one by one in the direction from the lower end of the working face to the upper end of the working face, together with the caving zone branch pipe. (4) Drag the branch pipe in the collapse zone: After the gap in the collapse zone is filled with gangue powder slurry, stop the batching, mixing and pumping, and drag it synchronously with the forward movement of the working face support during the coal mining shift.

5. The method as described in claim 4, characterized in that, The particle size of the surface-washed and underground-selected gangue is -50mm, the particle size of the underground excavated gangue is -300mm, the particle size of the oversize material of the continuous screening machine is +5mm, and the particle size of the undersize material is -5mm.

6. The method as described in claim 4, characterized in that, The branch pipes in the caving zone are arranged at intervals parallel to the long wall working face, with a spacing of 10-15 working face supports. The length of a single branch pipe is 1.2-1.5 times the daily working face advance. The branch pipes extend from the pre-reserved holes in the base of the working face support, and the slurry outlet is located in the caving zone.

7. The method as described in claim 4, characterized in that, In step (2), the gangue powder in the finished gangue powder silo is fed into the feeder via the B continuous metering feeder. The feeding capacity is calculated based on the following algorithm: Finished gangue powder feeding capacity: The calculated value of the flow meter A in step (2) is obtained by the following algorithm: Mine water feeding capacity: The calculated value of the flow meter B in step (2) is obtained by the following algorithm: Minimum capacity of admixture tank: Among them, Q B -Designed pumping capacity, m 3 / h;Q g - Finished gangue powder feeding capacity, t / h; Q w -Water supply capacity, m 3 / h;Q t -Admixture feeding capacity, m 3 / h;W g - Moisture content of finished gangue powder, %; C m - The mass concentration of the prepared gangue slurry, %; k t -Relative mass percentage of admixture, %; γ g -True density of finished gangue powder, t / m³ 3 ;γ w -True density of mine wastewater, t / m³ 3 ;γ t - True density of admixture, t / m 3 The admixture is a pumping agent and / or a quick-setting agent.

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