Coal gangue slurry long-distance pipeline conveying device and conveying method

Abstract

The application discloses a long-distance pipeline conveying device and method for coal gangue slurry, which comprises a coal gangue slurry preparation conveying system and a terminal dehydration system, a water return system for conveying separated water to be used in the preparation of the coal gangue slurry is arranged between the terminal dehydration system and the coal gangue slurry preparation conveying system, the water return system comprises a first-end water pool and a terminal water pool, and the coal gangue slurry preparation conveying system is connected to the terminal dehydration system through a main slurry conveying pipeline. The coal gangue is prepared into coal gangue slurry for pipeline conveying, is conveyed to a user terminal in a pipeline conveying mode, is dehydrated for use by the user, and long-distance clean and efficient transfer of the coal gangue is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal gangue solid waste disposal, in particular to a coal gangue slurry long-distance pipeline conveying device and conveying method. BACKGROUND

[0002] Coal gangue is an industrial solid waste discharged in the process of coal mining and washing, and its discharge amount is large. The accumulated coal gangue not only occupies a large amount of land, but also contains sulfides that are easy to oxidize and self-ignite, causing environmental pollution after rainwater erosion. At present, coal gangue is mostly treated by comprehensive utilization as circulating fluidized bed boiler fuel, building production material, light aggregate raw material, and goaf filling material. The traditional transfer mode of coal gangue includes railway, automobile or belt conveyor, etc. With the gradual increase of the discharge amount of coal gangue, the railway transfer capacity cannot meet the requirement of large volume, and the transfer of coal gangue by automobile or belt conveyor is restricted by environmental protection measures and green development. The large-volume clean transfer and treatment of coal gangue become a problem to be solved. At present, the existing large-volume comprehensive utilization of coal gangue is to use coal gangue as underground filling material. After the coal gangue is finely crushed and a certain proportion of fly ash or cement is added, a paste is prepared and then conveyed to the underground. The paste has high concentration and can only be conveyed for a short distance. Therefore, how to realize the stable long-distance pipeline conveying of coal gangue slurry is a problem to be solved. SUMMARY

[0003] In view of the above problems of the prior art, the present application provides a coal gangue slurry long-distance pipeline conveying device and conveying method. The coal gangue is prepared into coal gangue slurry for pipeline conveying, and is conveyed to the user terminal by the pipeline conveying mode. After dehydration treatment, the coal gangue is used by the user, realizing the long-distance clean and efficient transfer of coal gangue.

[0004] The technical scheme provided by the present application is as follows: a coal gangue slurry long-distance pipeline conveying device, which comprises a coal gangue slurry preparation and conveying system and a terminal dehydration system. A water return system for conveying separated water to the coal gangue slurry preparation is arranged between the terminal dehydration system and the coal gangue slurry preparation and conveying system. The coal gangue slurry preparation and conveying system comprises a belt conveyor, a coarse crusher and a multi-roller crusher connected in sequence. The outlet of the multi-roller crusher is connected with a first buffer bin and a second buffer bin, respectively. The outlet of the first buffer bin is connected to a mill metering belt. The outlet of the mill metering belt is connected to the inlet of a mill. The water return system comprises a first-end water pool and a terminal water pool. The outlet of the mill is connected to a buffer tank. The outlet of the buffer tank is connected to a slurry mixing tank. The outlet of the first-end water pool is connected to the inlet of the mill and the inlet of the slurry mixing tank in two ways. The outlet of the second buffer bin is connected to the inlet of the slurry mixing tank through a slurry mixing tank metering belt. The outlet of the slurry mixing tank is connected to the terminal dehydration system through a slurry conveying main pipeline.

[0005] Further, the terminal dewatering system comprises a terminal slurry storage tank connected with the slurry main pipeline, the outlet of the terminal slurry storage tank is connected to a vibrating screen, the oversize outlet of the vibrating screen is connected to a stockyard, the undersize outlet of the vibrating screen is connected to a coal gangue dewatering bin, the bottom of the coal gangue dewatering bin is provided with a pneumatic gate and a drainage valve, the outlet of the pneumatic gate is connected to the stockyard, the outlet of the drainage valve is connected to a thickener, the supernatant outlet of the thickener is connected to a terminal water pool, and the underflow of the thickener is pumped to the coal gangue dewatering bin.

[0006] Further, the terminal water pool is provided with a water main pipeline between the terminal water pool and the head-end water pool, and the water main pipeline is provided with a water main pump and an online densimeter.

[0007] Further, the pipeline between the head-end water pool and the mill is provided with a first electric valve and a mill water supply flowmeter, and the pipeline between the head-end water pool and the slurry mixing tank is provided with a second electric valve and a slurry mixing tank water supply flowmeter.

[0008] Further, the online densimeter is interlocked with the mill metering belt and the opening of the first electric valve.

[0009] Further, the bottom of the first buffer bin and the second buffer bin is provided with an electro-hydraulic gate, and the pipeline between the buffer tank and the slurry mixing tank is provided with a buffer tank discharge valve and a buffer tank discharge pump.

[0010] Further, the slurry main pipeline is provided with a slurry main pump, the buffer tank is provided with a liquid level meter, and the liquid level meter is interlocked with the buffer tank discharge valve and the buffer tank discharge pump.

[0011] Further, the slurry main pipeline, the water main pipeline and other gangue slurry pipelines all adopt alumina ceramic composite steel pipes, and the flow channels of all valves are coated with polyurethane layers to prevent abrasion.

[0012] The application provides another technical scheme: a coal gangue slurry long-distance pipeline conveying method, which comprises the following steps:

[0013] (1) the rubber belt conveyor is opened, the coal gangue raw materials enter a coarse crusher and a multi-roller crusher in sequence, and then enter two buffer bins until the coal amount reaches a preset value;

[0014] (2) clean water is injected into a head-end water pool, and a first electric valve and a second electric valve are opened and adjusted;

[0015] (3) the mill is started, the opening of the electro-hydraulic gate of the two buffer bins is adjusted, the ratio of the discharging amount of the slurry mixing tank metering belt to the discharging amount of the mill metering belt is set to be less than or equal to 25%, the slurry concentration in the mill is about 40% to 60%, and the buffer tank discharge valve is closed;

[0016] (4) When the mill runs stably and the buffer tank reaches a medium-high liquid level, open the buffer tank discharge valve and buffer tank discharge pump, and open the slurry mixing tank metering belt and the slurry mixing tank agitator, adjust the opening of the second electric valve, and the slurry concentration in the slurry mixing tank is 30%-55%;

[0017] (5) When the slurry quantity in the slurry mixing tank reaches the quantity of one-time pipe transportation, open the slurry transportation main pump and the terminal slurry storage tank agitator;

[0018] (6) After the coal gangue slurry is transported to the terminal slurry storage tank, start the vibrating screen, and the coal gangue slurry is screened by the vibrating screen, the undersize is pumped to the coal gangue dewatering bin for dewatering, the oversize is transferred into the stockyard together with the gangue discharged by the pneumatic valve of the coal gangue dewatering bin, the filtrate discharged by the drainage valve of the coal gangue dewatering bin is concentrated in the thickener, the thickener underflow returns to the coal gangue dewatering bin, and the supernatant of the thickener enters the terminal water pool;

[0019] (7) Start the water transportation main pump and the online density meter, and supplement the water quantity of the first-end water pool until stable.

[0020] Further, the particle size of the coal gangue raw material is not greater than 200 mm, the coal gangue is broken to a particle size range of less than 6 mm by a coarse crusher and a multi-roller crusher, the maximum particle size of the mill discharge is 1.0 mm-2.0 mm, and the proportion of -0.045 mm fine particles is 20%-40%, and the agitator speed in the buffer tank is 100 r / min-140 r / min.

[0021] The beneficial effects of the present application are:

[0022] (1) After the coal gangue is broken in multiple stages, the metering belt and the fine mill are arranged, and the coal gangue after partial crushing is quantitatively fine ground, the content of fine particles in the coal gangue slurry can be flexibly adjusted according to the pipe transportation concentration and the concentration of the terminal backwater, the pipe transportation slurry particle size grading is adjusted, and the safety and stable operation of pipe transportation are ensured;

[0023] (2) The inner lining of the conveying main pipe is an alumina ceramic composite steel pipe, and the inner wall of the valve flow channel is coated with a polyurethane layer, which effectively alleviates the characteristics that the coal gangue is hard and more easily abrades the pipe and valve at high speed;

[0024] (3) The terminal dewatering adopts a coal gangue dewatering bin according to the characteristics that the coal gangue is not easy to absorb water and the fine particle coal gangue will wear out the filter cloth when pressure filtering, and uses gravity to remove water, which reduces the use of similar pressure filtration equipment and reduces the cost investment;

[0025] (4) The water removed at the terminal contains a certain amount of fine particles, which can be pumped back to the first end as one of the water sources for production, realizing the saving and secondary use of water resources;

[0026] The coal gangue is crushed and finely processed before long-distance pipeline transportation, and the end user does not need to further process the coal gangue, so that the process treatment link of the end user is simplified, and the conveying process is clean, efficient, environmentally friendly and high in flexibility. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the present application;

[0028] In the figure: 1 - belt conveyor; 2 - coarse crusher; 3 - multi-roll crusher; 4 - electro-hydraulic gate; 5 - mill metering belt; 6 - mixing tank metering belt; 7 - mill; 8 - buffer tank; 9 - buffer tank discharge pump; 10 - buffer tank discharge valve; 11 - mixing tank; 12 - slurry conveying main pump; 13 - slurry conveying main pipeline; 14 - terminal slurry storage tank; 15 - vibrating screen; 16 - coal gangue bin; 17 - pneumatic gate; 18 - drain valve; 19 - thickener; 20 - terminal water pool; 21-1 - online density meter; 21-2 - mixing tank water supply flow meter; 21-3 - mill water supply flow meter; 22 - water conveying main pump; 23 - water conveying main pipeline; 24 - first end water pool; 25 - second electric valve; 26 - first electric valve; 27 - first buffer bin; 28 - second buffer bin. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with specific embodiments, wherein the drawings are only used for exemplary description, and the representations are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present application. In order to better illustrate the specific embodiments of the present application, some components of the drawings will be omitted, enlarged or reduced, and it can be understood by those skilled in the art that some known structures and their descriptions in the drawings can be omitted. Based on the specific embodiments in the present application, all other specific embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0031] As Figure 1The device for long-distance pipeline transportation of coal gangue slurry includes a coal gangue slurry preparation and transportation system and a terminal dehydration system, a water return system for transporting separated water to be used in the preparation of coal gangue slurry is arranged between the terminal dehydration system and the coal gangue slurry preparation and transportation system, the coal gangue slurry preparation and transportation system includes a belt conveyor 1, a coarse crusher 2 and a multi-roller crusher 3 connected in sequence, the outlet of the multi-roller crusher 3 is connected with a first buffer bin 27 and a second buffer bin 28 respectively, the outlet of the first buffer bin 27 is connected to a mill metering belt 5, the outlet of the mill metering belt 5 is connected to the inlet of a mill 7, the water return system includes a first-end water pool 21 and a terminal water pool 20, the outlet of the mill 7 is connected to a buffer tank 8, the outlet of the buffer tank 8 is connected to a slurry mixing tank 11, the water outlet of the first-end water pool 24 is connected to the inlet of the mill 7 and the inlet of the slurry mixing tank 11 in two ways, the outlet of the second buffer bin 28 is connected to the inlet of the slurry mixing tank 11 through a slurry mixing tank metering belt 6, and the outlet of the slurry mixing tank 11 is connected to a terminal dehydration system through a slurry transportation main pipeline 13.

[0032] The two-stage crushing of the coarse crusher 2 and the multi-roller crusher 3 can crush the coal gangue to below 6 mm and store the coal gangue in the two buffer bins, a part of the coal gangue is metered by the mill metering belt 5 and then sent to the mill 7 for fine grinding, and a part of the coal gangue is metered by the slurry mixing tank metering belt 6 and then mixed with the slurry product from the mill 7 and the water for production in the slurry mixing tank 11, and the slurry after being stirred uniformly is pumped into the terminal storage tank 14 for stirring.

[0033] The terminal dehydration system includes a terminal slurry storage tank 14 connected with the slurry transportation main pipeline 13, the outlet of the terminal slurry storage tank 14 is connected to a vibrating screen 15, the screen upper material outlet of the vibrating screen 15 is connected to a stockyard, the screen lower material outlet of the vibrating screen 15 is connected to a coal gangue dehydration bin 16, the bottom of the coal gangue dehydration bin 16 is provided with a pneumatic gate 17 and a drainage valve 18, the outlet of the pneumatic gate 17 is connected to the stockyard, the outlet of the drainage valve 18 is connected to a thickener 19, the supernatant outlet of the thickener 19 is connected to the terminal water pool 20, and the underflow of the thickener 19 is pumped to the coal gangue dehydration bin 16.

[0034] The coal gangue dehydration bin 16 is provided with at least two or more bins according to the transportation capacity, one of which is a standby bin, and the two coal gangue dehydration bins are used alternately, one of which is used for feeding while the other can be used for draining or discharging at the same time. The coal gangue dehydration bin is a cylindrical steel structure bin, the discharge part of the bin is a cone, and the radius and height of the bin are determined according to the transportation capacity. The discharge part is provided with a pneumatic gate 17 and a drainage valve 18. The drainage valve 18 and the pneumatic gate 17 of the coal gangue dehydration bin cannot be opened at the same time, and the pneumatic gate 17 is in a closed state when the drainage valve 18 is opened.

[0035] The terminal water tank 20 to the first end water tank 21 is provided with a water delivery main pipeline 23, and the water delivery main pipeline 23 is provided with a water delivery main pump 22 and an online density meter 21-1. The backwater in the terminal water tank 20 is pumped to the first end water tank 24 by the water delivery main pump 22 through the water delivery main pipeline 23. The water delivery main pipeline 23 is provided with an online density meter at the outlet end of the water tank, which can remotely display the concentration of particles in the backwater. The water in the first end water tank 24 is pumped to the mill inlet and the mixing tank inlet pipeline as needed. The mill inlet pipeline and the mixing tank inlet pipeline are provided with water supply flow meters.

[0036] The pipeline between the first end water tank 24 and the mill 7 is provided with a first electric valve 26 and a mill water supply flow meter 21-3, and the pipeline between the first end water tank 24 and the mixing tank 11 is provided with a second electric valve 25 and a mixing tank water supply flow meter 21-2. The online density meter 21-1 is interlocked with the mill metering belt 5 and the opening of the first electric valve 26. The content of fine particles in the coal gangue slurry is flexibly adjusted according to the pipeline delivery concentration and the concentration of the terminal backwater, and the particle size grading of the pipeline slurry is adjusted. The online density meter 21-1 can display the density of the backwater in the terminal water tank 20 on site, and the feed amount of the mill metering belt 5 and the opening of the first electric valve 26 can be adjusted according to the backwater density and the delivery concentration, so as to control the product concentration and particle size grading of the mill 7.

[0037] The bottom of the first buffer bin 27 and the second buffer bin 28 is provided with an electro-hydraulic gate 4, and the pipeline between the buffer tank 8 and the mixing tank 11 is provided with a buffer tank discharge valve 10 and a buffer tank discharge pump 9.

[0038] The buffer tank 8 is provided with a liquid level meter, and the liquid level meter is interlocked with the buffer tank discharge valve 10 and the buffer tank discharge pump 9.

[0039] The slurry delivery main pipeline 13, the water delivery main pipeline 23 and other gangue slurry pipelines are all made of alumina ceramic composite steel pipes, and the flow channels of all valves are coated with a polyurethane layer to prevent erosion.

[0040] A coal gangue slurry long-distance pipeline transportation method, comprising the following steps:

[0041] (1) Open the belt conveyor 1, and the coal gangue raw materials enter the coarse crusher 2 and the multi-roller crusher 3 in turn, and then enter the two buffer bins until the coal amount reaches the preset value;

[0042] (2) Inject clean water into the first end water tank 24, and open and adjust the first electric valve 26 and the second electric valve 25;

[0043] (3) Start the mill 7, adjust the opening of the electro-hydraulic gate 4 of the two buffer bins, set the ratio of the discharge amount of the mill metering belt 5 to the discharge amount of the buffer tank metering belt 6 to be less than 25%, and the slurry concentration in the mill 7 is about 40% to 60%, and the buffer tank discharge valve 10 is closed;

[0044] (4) When the mill 7 runs stably and the buffer tank 8 reaches a medium-high liquid level, open the buffer tank discharge valve 10 and the buffer tank discharge pump 9, and open the mixer tank metering belt 6 and the mixer tank 11 agitator, adjust the opening of the second electric valve 25, and the slurry concentration in the mixer tank 11 is 30% to 55%;

[0045] (5) When the amount in the mixer tank 11 reaches the amount of slurry transported by a pipe at a time, open the slurry main pump 12 and the terminal slurry storage tank 14 agitator;

[0046] (6) After the coal gangue slurry is transported to the terminal slurry storage tank 14, start the vibrating screen 15, and after the coal gangue slurry is screened by the vibrating screen 15, the undersize is pumped to the coal gangue dewatering bin 16 for dewatering, the oversize is transferred into the stockyard together with the gangue discharged by the pneumatic valve 17 of the coal gangue dewatering bin 16, the filtrate discharged by the drainage valve 18 of the coal gangue dewatering bin 16 is concentrated by the thickener 19, the thickener underflow is returned to the coal gangue dewatering bin 16, and the supernatant of the thickener 19 is discharged into the terminal water pool 20;

[0047] (7) Start the water main pump 22 and the online density meter 21-1, and supplement the water in the head-end water pool 24 until it is stable. Example 1

[0048] The coal gangue used in this example is a common coal gangue in Pingdingshan, which is washed by a coal preparation plant, and the maximum particle size is 75 mm and the water content is 5%. The steps for preparing the coal gangue slurry for long-distance pipeline transportation are as follows:

[0049] (1) After being crushed by a coarse crusher and a multi-roller crusher, the maximum particle size of the coal gangue is 6 mm;

[0050] (2) After injecting clean water into the head-end water pool, the first electric valve and the second electric valve are opened and adjusted in sequence;

[0051] (3) Start the mill, adjust the opening of the electro-hydraulic gate of the two buffer bins, set the ratio of the discharge amount of the mill metering belt to the discharge amount of the buffer tank metering belt to be 20%, adjust the slurry concentration in the mill to be about 52%, and after the mill runs stably, the product particle size of the mill discharge gangue slurry is measured to be a maximum particle size of 1.2 mm, and the content of -0.045 mm fine particles is 30%;

[0052] (4) open the buffer tank discharge valve and the buffer tank discharge pump, and open the mixing tank metering belt and the mixer of the mixing tank, adjust the second electric valve to a certain opening, the mixer speed in the buffer tank 8 is 130 r / min, the slurry concentration in the mixing tank 11 is about 50%, the content of -0.045mm fine particles is 25.5%, and the slurry viscosity is about 105mpa·s, so that the coal gangue slurry can be stably transported to the terminal.

[0053] Comparative Example 1

[0054] The coal gangue used in the present comparative example is a common coal gangue in Pingdingshan, which is washed in a coal preparation plant, and the maximum particle size is 75mm and the water content is 5%. The steps for preparing the coal gangue slurry for long-distance pipeline transportation are as follows:

[0055] (1) After being crushed by a coarse crusher, the maximum particle size of the coal gangue is 15mm;

[0056] (2) After injecting clean water into the first-end pool, the first electric valve and the second electric valve are opened and adjusted in sequence;

[0057] (3) Start the mill, adjust the opening of the electro-hydraulic gate of the two buffer bins, set the discharge amount ratio of the mill metering belt to the mixing tank metering belt to 33%, and adjust the slurry concentration in the mill to about 52%. After the mill runs stably, the product particle size of the mill discharge gangue slurry is measured to be a maximum particle size of 3mm, and the content of -0.045mm fine particles is 15%;

[0058] (4) open the buffer tank discharge valve and the buffer tank discharge pump, and open the mixing tank metering belt and the mixer of the mixing tank, adjust the second electric valve to a certain opening, the mixer speed in the buffer tank 8 is 130 r / min, the slurry concentration in the mixing tank 11 is about 50%, the content of -0.045mm fine particles is 25.5%, and the slurry viscosity is about 105mpa·s, so that the coal gangue slurry can be stably transported to the terminal.

[0059] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A coal gangue slurry long distance pipeline transportation device, characterized in that, The coal gangue pulping conveying system and the terminal dewatering system are provided with a backwater system for conveying separated water to the coal gangue pulping, the coal gangue pulping conveying system comprises a belt conveyor (1), a coarse crusher (2) and a multi-roller crusher (3) connected in sequence, the outlet of the multi-roller crusher (3) is connected with a first buffer bin (27) and a second buffer bin (28) respectively, the outlet of the first buffer bin (27) is connected to a mill metering belt (5), the outlet of the mill metering belt (5) is connected to the inlet of a mill (7), the backwater system comprises a head-end water tank (21) and a terminal water tank (20), the outlet of the mill (7) is connected to a buffer tank (8), the outlet of the buffer tank (8) is connected to a slurry mixing tank (11), the outlet of the head-end water tank (24) is connected to the inlet of the mill (7) and the inlet of the slurry mixing tank (11) in two ways, the outlet of the second buffer bin (28) is connected to the inlet of the slurry mixing tank (11) through a slurry mixing tank metering belt (6), and the outlet of the slurry mixing tank (11) is connected to a terminal dewatering system through a slurry conveying main pipeline (13). The terminal dewatering system comprises a terminal slurry storage tank (14) connected with the slurry conveying main pipeline (13), the outlet of the terminal slurry storage tank (14) is connected to a vibrating screen (15), the oversize outlet of the vibrating screen (15) is connected to a stockyard, the undersize outlet of the vibrating screen (15) is connected to a coal gangue dewatering bin (16), the bottom of the coal gangue dewatering bin (16) is provided with a pneumatic gate (17) and a drainage valve (18), the outlet of the pneumatic gate (17) is connected to the stockyard, the outlet of the drainage valve (18) is connected to a thickener (19), the supernatant outlet of the thickener (19) is connected to the terminal water tank (20), and the underflow of the thickener (19) is pumped to the coal gangue dewatering bin (16). A water conveying main pipeline (23) is arranged between the terminal water tank (20) and the head-end water tank (21), and a water conveying main pump (22) and an online densimeter (21-1) are arranged on the water conveying main pipeline (23). A first electric valve (26) and a mill water supply flowmeter (21-3) are arranged on the pipeline between the head-end water tank (24) and the mill (7), and a second electric valve (25) and a slurry mixing tank water supply flowmeter (21-2) are arranged on the pipeline between the head-end water tank (24) and the slurry mixing tank (11). The online densimeter (21-1) is interlocked with the mill metering belt (5) and the opening of the first electric valve (26). The slurry conveying main pipeline (13), the water conveying main pipeline (23) and other slurry conveying pipelines are all made of an alumina ceramic lined steel pipe, and the flow channels of all the valves are coated with a polyurethane layer to prevent abrasion.

2. The coal gangue slurry long distance pipeline transportation device according to claim 1, characterized in that, The bottom of the first buffer bin (27) and the second buffer bin (28) is provided with an electro-hydraulic gate (4), and a buffer tank discharge valve (10) and a buffer tank discharge pump (9) are arranged on the pipeline between the buffer tank (8) and the slurry mixing tank (11).

3. The coal gangue slurry long distance pipeline transportation device according to claim 2, characterized in that, The main pulp conveying pipeline (13) is provided with a main pulp conveying pump (12), the buffer tank (8) is provided with a liquid level meter, and the liquid level meter is interlocked with the buffer tank discharge valve (10) and the buffer tank discharge pump (9).

4. A long-distance pipeline transportation method of coal gangue slurry, which is implemented by using the long-distance pipeline transportation device of coal gangue slurry according to claim 3, characterized in that, It comprises the following steps: (1) Open the adhesive tape conveyor (1), and the coal gangue raw materials enter the coarse crusher (2) and the multi-roller crusher (3) in turn, and then enter the two buffer bins, and the coal amount reaches the preset value; (2) Inject clean water into the first-end water pool (24), open and adjust the first electric valve (26) and the second electric valve (25); (3) Start the mill (7), adjust the opening of the electro-hydraulic gate (4) of the two buffer bins, set the ratio of the discharging amount of the mill metering belt (5) and the mixing tank metering belt (6) to be less than or equal to 25%, the pulp concentration in the mill (7) is 40%-60%, and the buffer tank discharge valve (10) is closed; (4) When the mill (7) runs stably and the buffer tank (8) reaches a medium-high liquid level, open the buffer tank discharge valve (10) and the buffer tank discharge pump (9), and open the mixer of the mixing tank (11) and the mixing tank metering belt (6), adjust the opening of the second electric valve (25), and the pulp concentration in the mixing tank (11) is 30%-55%; (5) When the amount in the mixing tank (11) reaches the amount of the first pipe conveying pulp, open the main pulp conveying pump (12) and the agitator of the terminal slurry storage tank (14); (6) After the coal gangue slurry is conveyed to the terminal slurry storage tank (14), start the vibrating screen (15), the undersize is pumped to the coal gangue dewatering bin (16) for dewatering after being screened by the vibrating screen (15), the oversize is loaded into the stockyard together with the gangue discharged by the pneumatic valve (17) of the coal gangue dewatering bin (16), the filtrate discharged by the drainage valve (18) of the coal gangue dewatering bin (16) is concentrated in the thickener (19), the concentrated underflow returns to the coal gangue dewatering bin (16), and the supernatant of the thickener (19) enters the terminal water pool (20); (7) Start the water conveying main pump (22) and the online density meter (21-1), and supplement the water amount of the first-end water pool (24) until it is stable.

5. The coal gangue slurry long distance pipeline transportation method according to claim 4, characterized in that: The particle size of the coal gangue raw materials is not greater than 200 mm, the coal gangue is crushed to a particle size range of less than 6 mm by the coarse crusher (2) and the multi-roller crusher (3), the maximum particle size of the mill (7) is 1.0 mm-2.0 mm, the proportion of the -0.045 mm fine particles in the particle size distribution of the mill discharge product is 20%-40%, and the stirring speed of the buffer tank (8) is 100 r / min-140 r / min.

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