Coal gangue recycling system

Abstract

This application provides a coal gangue recycling system, comprising: a gangue silo, a crushing station, a ball mill workshop, and a grouting station connected sequentially by a conveying device; the gangue silo for storing coal gangue; the crushing station equipped with a crushing device for crushing the coal gangue conveyed from the gangue silo by the conveying device to obtain coal gangue fragments; the ball mill workshop equipped with a ball milling device for grinding the coal gangue fragments conveyed from the ball milling device by the conveying device to obtain coal gangue powder; the grouting station equipped with a grout mixing tank, which has a coal gangue powder inlet, a fly ash inlet, and a water inlet for mixing the coal gangue powder, fly ash, and water into a grout; and a grouting pipe body, one end of which is connected to the grout mixing tank and the other end of which extends into a grouting hole in the ground for injecting the grout into the grouting hole in the ground. This application achieves both solid waste reduction and surface subsidence reduction.

Description

Technical Field

[0001] This application relates to the field of coal gangue technology, and more particularly to a coal gangue recycling system. Background Technology

[0002] Coal gangue is a solid waste generated during coal mining and washing. It is a dark gray rock with a low carbon content and harder than coal, which is associated with coal seams during coal formation. It includes gangue excavated during tunneling, gangue extracted from the roof, floor, and interlayers during mining, and gangue removed during coal washing. Due to the large volume of gangue excavated in the early stages of mine construction, or the inability to promptly dispose of surface-washed gangue, the temperature of the gangue pile gradually increases over time, eventually leading to spontaneous combustion. This combustion causes various sulfides to precipitate or leach, polluting the atmosphere, land, and water bodies, and easily causing environmental and safety accidents. Furthermore, with the deepening of the national energy industry's green transformation and increasingly stringent environmental policies, the green treatment of coal gangue is urgently needed.

[0003] However, existing methods for treating coal gangue mainly involve surface stockpiling, trench filling, and land reclamation. Since coal gangue typically contains combustible materials such as pyrite (FeS2), these materials react with oxygen at room temperature, releasing heat. When this heat accumulates to a certain level, the temperature rises, eventually leading to spontaneous combustion. These methods expose the coal gangue directly to the oxygen-containing air. Therefore, these methods of treating coal gangue may pose a risk of spontaneous combustion, making them unsafe. Based on this, this application proposes a coal gangue recycling system. Utility Model Content

[0004] This application provides a coal gangue recycling system to solve the technical problems described in the background section.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution: This application provides a coal gangue recycling system, comprising a gangue bin, a crushing station, a ball mill workshop, and a grouting station that are connected in sequence by a conveying device; The gangue bin is used to store coal gangue; The crushing station is equipped with a crushing device, which is used to crush the coal gangue conveyed from the gangue bin by the conveying device to obtain coal gangue fragments. The ball mill workshop is equipped with a ball milling device, which is used to grind the coal gangue fragments conveyed from the ball milling device by the conveying device to obtain coal gangue powder. The grouting station is equipped with a slurry mixing tank, which has a coal gangue powder inlet, a fly ash inlet and a water inlet, for mixing the coal gangue powder, fly ash and water into a slurry. The grouting pipe body has one end connected to the grout mixing tank and the other end extending into the grouting hole in the ground, for injecting the grout into the grouting hole in the ground.

[0006] Optionally, a transfer station is provided between the gangue bin and the crushing station, and the inlet and outlet of the transfer station are respectively connected to the outlet of the gangue bin and the inlet of the crushing station through the conveying device; The transfer station is used to pre-process the coal gangue transported therefrom by the conveying device from the gangue bin.

[0007] Optionally, the grouting pipe body includes a first grouting pipe and a plurality of second grouting pipes; One end of the first grouting pipe is connected to the grout mixing tank, and a plurality of second grouting pipes are sequentially connected to the pipe body of the first grouting pipe near the grout mixing tank. The other end of the first grouting pipe and the other end of the plurality of second grouting pipes are both used to extend into the grouting holes of the ground that correspond to them one by one. Each of the first grouting pipe and the plurality of second grouting pipes is equipped with a first grouting pump.

[0008] Optionally, the other end of the first grouting pipe can be connected to a third grouting pipe, and the end of the third grouting pipe away from the first grouting pipe is used to extend into the grouting hole in the ground. The other end of each of the second grouting pipes can be connected to a fourth grouting pipe, and the end of the fourth grouting pipe away from the second grouting pipe is used to extend into the grouting hole in the ground. Both the third grouting pipe and the fourth grouting pipe are equipped with a second grouting pump.

[0009] Optionally, there are multiple third grouting pipes, and the multiple third grouting pipes are connected in sequence; There are multiple fourth grouting pipes, and the multiple fourth grouting pipes are connected in sequence.

[0010] Optionally, one end of the first grouting pipe is connected to the bottom of the grout mixing tank, and a grout valve is provided on the pipe body near the grout mixing tank. A plurality of second grouting pipes are sequentially connected to the pipe body of the first grouting pipe near the grout valve.

[0011] Optionally, the mixing tank is equipped with a stirring unit, the bottom end of which penetrates and extends into the mixing tank to mix the coal gangue powder, fly ash and water entering the mixing tank.

[0012] The coal gangue recycling system provided in this application stores coal gangue generated during coal mining through a gangue bin. The coal gangue stored in the bin is transported to a crushing station via a conveying device, where it is crushed by a crushing device to obtain coal gangue fragments. The coal gangue fragments are then transported to a ball mill workshop via a conveying device and ground into coal gangue powder by a ball mill device. The coal gangue powder is then transported to a slurry mixing tank via a conveying device, where fly ash and water are added to produce a slurry with good fluidity. The slurry in the mixing tank is injected into grouting holes on the ground through the grouting pipe body to achieve the recycling of coal gangue. Compared with existing methods of treating coal gangue, such as ground stockpiling, trench filling, and land reclamation, this application not only reduces solid waste emissions but also reduces surface sedimentation. Furthermore, this application can process and reuse large quantities of coal gangue, minimizing the risk of spontaneous combustion of reused coal gangue and thus improving the safety of coal gangue reuse. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A flowchart of a coal gangue recycling system provided in an embodiment of this application; Figure 2 A flowchart of a coal gangue recycling system provided in another embodiment of this application; Figure 3 A schematic diagram of the structure of a coal gangue recycling system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a coal gangue recycling system provided in another embodiment of this application.

[0015] In the diagram: 100, conveying device; 200, gangue bin; 300, crushing station; 301, crushing device; 400, ball mill workshop; 401, ball mill device; 500, grouting station; 501, grout mixing tank; 5011, coal gangue powder inlet; 5012, fly ash inlet; 5013, water inlet; 5014, mixing unit; 600, grouting pipe body; 601, first grouting pipe; 6011, first grouting pump; 602, second grouting pipe; 603, third grouting pipe; 6031, second grouting pump; 604, fourth grouting pipe; 700, grouting hole; 800, transfer station; 900, slurry valve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0017] refer to Figures 1 to 4 This application provides a coal gangue recycling system, including a gangue silo 200, a crushing station 300, a ball mill workshop 400, and a grouting station 500 connected in sequence by a conveying device 100. The conveying device 100 can be a belt conveyor, a pneumatic conveyor, etc. The belt conveyor is suitable for conveying lumpy coal gangue, and the pneumatic conveyor is suitable for conveying powdery coal gangue. The specific type and model of the conveying device 100 can be selected according to the actual situation. Therefore, this application does not specifically limit it.

[0018] The gangue bin 200 is used to store coal gangue. By collecting and storing the coal gangue generated during the coal mining process in the gangue bin 200, the random piling of coal gangue is avoided, and centralized storage of coal gangue is achieved.

[0019] The crushing station 300 is equipped with a crushing device 301, which is used to crush coal gangue conveyed from the gangue bin 200 by the conveying device 100 to obtain coal gangue fragments. The crushing device 301 can be a jaw crusher, cone crusher, impact crusher, shear, etc., and its purpose is to crush the coal gangue through mechanical means such as compression, impact, and shearing to obtain coal gangue fragments. The ball mill workshop 400 is equipped with a ball mill device 401, which is used to grind the coal gangue fragments conveyed from the ball mill device 401 by the conveying device 100 to obtain coal gangue powder. The ball mill device 401 can be a ball mill, which includes dry ball mills, wet ball mills, etc., and the specific type can be selected according to the material to be ground; however, this application does not specifically limit its type.

[0020] The grouting station 500 is equipped with a grout mixing tank 501, which has a coal gangue powder inlet 5011, a fly ash inlet 5012, and a water inlet 5013. The coal gangue powder, fly ash, and water entering the tank are mixed to form a slurry. Specifically, the slurry has good fluidity. During the slurry preparation process, the masses of coal gangue powder, fly ash, and water are all fixed and can be set according to actual conditions. Coal gangue powder is added to the grout mixing tank 501 through the coal gangue powder inlet 5011, fly ash is added to the grout mixing tank 501 through the fly ash inlet 5012, and water is added to the grout mixing tank 501 through the water inlet 5013. The coal gangue powder, fly ash, and water then mix within the grout mixing tank 501 to obtain the slurry.

[0021] The grouting pipe body 600 has one end connected to the grout mixing tank 501 and the other end extending into the grouting hole 700 on the ground for injecting grout into the grouting hole 700. The grouting hole 700 is located on the ground, and its depth depends on the rock strata movement and surface subsidence. The grout is filled into the key layers of rock strata movement and surface subsidence, and the filled grout, after solidification, can minimize rock strata movement and surface subsidence. Furthermore, the applicant uses this application to achieve the reuse of coal gangue, with a disposal capacity of 600,000 to 800,000 tons per year. This application can be widely applied to coal mining, solid waste reduction, and surface subsidence reduction, and has advantages such as low cost and high efficiency.

[0022] The coal gangue recycling system provided in this application stores coal gangue generated during coal mining through a gangue bin 200. The coal gangue stored in the gangue bin 200 is transported to a crushing station 300 via a conveying device 100 and crushed by a crushing device 301 in the crushing station 300 to obtain coal gangue fragments. The coal gangue fragments are then transported to a ball mill workshop 400 via the conveying device 100 and ground into coal gangue powder by the ball mill device 401 in the ball mill workshop 400. The coal gangue powder is then transported to a slurry mixing tank 501 via the conveying device 100, and fly ash and water are added to the slurry mixing tank 501 to obtain a slurry with good fluidity. The slurry in the slurry mixing tank 501 is injected into a grouting hole 700 on the ground through a grouting pipe body 600 to realize the recycling of coal gangue. Compared with existing methods of treating coal gangue, such as ground stockpiling, trench filling, and land reclamation, this application not only reduces solid waste emissions but also reduces surface sedimentation. Furthermore, this application can process and reuse large quantities of coal gangue, minimizing the risk of spontaneous combustion of reused coal gangue and thus improving the safety of coal gangue reuse.

[0023] In some embodiments, reference Figure 2In this application, a transfer station 800 is provided between the gangue bin 200 and the crushing station 300. The inlet and outlet of the transfer station 800 are connected to the outlet of the gangue bin 200 and the inlet of the crushing station 300 through the conveying device 100, respectively. Specifically, the transfer station 800 is used to pre-process the coal gangue transported from the gangue bin to it by the conveying device 100.

[0024] In the above embodiments, the transfer station 800 is an intermediate place for pre-processing the coal gangue transported from the gangue bin 200 by the conveying device 100. The pre-processing refers to screening the coal lumps and other impurities mixed in the coal gangue, with the aim of increasing the coal gangue content in the final ground coal gangue powder to ensure the fluidity of the slurry.

[0025] In some embodiments, reference Figure 3 and Figure 4 The grouting pipe body 600 in this application includes a first grouting pipe 601 and a plurality of second grouting pipes 602; wherein, the number of second grouting pipes 602 can be set according to the actual situation, and this application does not specifically limit it.

[0026] Specifically, one end of the first grouting pipe 601 is connected to the grout mixing tank 501, and a plurality of second grouting pipes 602 are sequentially connected to the pipe body of the first grouting pipe 601 near the grout mixing tank 501. The other end of the first grouting pipe 601 and the other end of the plurality of second grouting pipes 602 are both used to extend into the grouting holes 700 on the ground corresponding to them. A first grouting pump 6011 is provided on the first grouting pipe 601 and the plurality of second grouting pipes 602.

[0027] In the above embodiment, by sequentially connecting multiple second grouting pipes 602 to the pipe body of the first grouting pipe 601 near the grout mixing tank 501, and under the power provided by the first grouting pump 6011, the grout in the grout mixing tank 501 is simultaneously injected into multiple ground grouting holes 700 corresponding one-to-one with the first grouting pipe 601 and the multiple second grouting pipes 602, the grouting efficiency is improved.

[0028] In some embodiments, reference Figure 4 In this application, the other end of the first grouting pipe 601 (specifically, the end of the first grouting pipe 601 away from the grout mixing tank 501) can be connected to the third grouting pipe 603. The end of the third grouting pipe 603 away from the first grouting pipe 601 is used to extend into the grouting hole 700 in the ground. When the end of the first grouting pipe 601 away from the grout mixing tank 501 is too far from the grouting port 700 in the ground to extend into the grouting hole 700, the grout can be transported over a long distance by connecting the end of the first grouting pipe 601 away from the grout mixing tank 501 to the third grouting pipe 603.

[0029] In addition, the other end of each of the multiple second grouting pipes 602 can be connected to a fourth grouting pipe 604. The end of the fourth grouting pipe 604 away from the second grouting pipe 602 is used to extend into the grouting hole 700 in the ground. When the end of the second grouting pipe 602 away from the first grouting pipe 601 is too far from the grouting port 700 in the ground to extend into the grouting hole 700, the grout can be transported over a long distance by connecting the end of the second grouting pipe 602 away from the first grouting pipe 601 to the fourth grouting pipe 604.

[0030] The third grouting pipe 603 and the fourth grouting pipe 604 are each equipped with a second grouting pump 6031.

[0031] In the above embodiment, when the grout in the grout mixing tank 501 enters the grouting hole 700 of the ground corresponding to the first grouting pipe 601 through the first grouting pipe 601 and the third grouting pipe 603 in sequence, the first grouting pump 6011 on the first grouting pipe 601 and the second grouting pump 6031 on the third grouting pipe 603 are turned on, thereby providing the power for the grout in the grout mixing tank 501 to enter the grouting hole 700 of the ground corresponding to the first grouting pipe 601 through the first grouting pipe 601 and the third grouting pipe 603. In addition, when the grout in the mixing tank 501 enters the grouting hole 700 on the ground corresponding to the second grouting pipe 602 through the first grouting pipe 601, the second grouting pipe 602 and the fourth grouting pipe 604 in sequence, the first grouting pump 6011 on the second grouting pipe 602 and the second grouting pump 6031 on the fourth grouting pipe 604 are turned on, thereby providing the power for the grout in the mixing tank 501 to enter the grouting hole 700 on the ground corresponding to the second grouting pipe 602 through the first grouting pipe 601, the second grouting pipe 602 and the third grouting pipe 603.

[0032] In some embodiments, there are multiple third grouting pipes 603 in this application, and the multiple third grouting pipes 603 are connected in sequence; wherein, the number of third grouting pipes 603 depends on the distance between the end of the first grouting pipe 601 away from the grouting tank 501 and the grouting port 700 on the ground. The number of third grouting pipes 603 can be set according to the actual situation, and this application does not specifically limit it.

[0033] In addition, there are multiple fourth grouting pipes 604, which are connected in sequence. The number of fourth grouting pipes 604 depends on the distance between the end of each second grouting pipe 602 away from the first grouting pipe 601 and the grouting port 700 on the ground. The number of fourth grouting pipes 604 can be set according to the actual situation, and this application does not make a specific limitation on it.

[0034] In the above embodiments, when the end of the first grouting pipe 601 that is far from the grout mixing tank 501 cannot extend into the grouting port 700 on the ground corresponding to it, multiple third grouting pipes 603 can be sequentially connected to the end of the first grouting pipe 601 that is far from the grout mixing tank 501 until the end of the third grouting pipe 603 that is far from the first grouting pipe 601 connected to it or the end of the third grouting pipe 603 that is far from the third grouting pipe 603 connected to it can extend into the grouting hole 700 on the ground corresponding to the first grouting pipe 601 and inject the grout into the grouting hole 700 on the ground, thereby realizing the long-distance transportation and reuse of coal gangue. In addition, when the end of the second grouting pipe that is far from the first grouting pipe cannot be inserted into the grouting port on the ground corresponding to it, multiple fourth grouting pipes 604 can be sequentially connected to the end of the second grouting pipe 602 that is far from the first grouting pipe 601 until the end of the fourth grouting pipe 604 that is far from the second grouting pipe 602 connected to it or the end of the fourth grouting pipe 604 that is far from the fourth grouting pipe 604 connected to it can be inserted into the grouting hole 700 on the ground corresponding to the second grouting pipe 602 and the grout can be injected into the grouting hole 700 on the ground, thereby realizing the long-distance transportation and reuse of coal gangue.

[0035] In some embodiments, reference Figure 3 and Figure 4 In this application, one end of the first grouting pipe 601 is connected to the bottom of the grout mixing tank 501, and a grout valve 900 is provided on the pipe body near the grout mixing tank 501. A plurality of second grouting pipes 602 are sequentially connected to the pipe body of the first grouting pipe 601 near the grout valve 900.

[0036] In the above embodiment, the slurry valve 900 is closed during the slurry preparation process in the slurry mixing tank 501. Once the slurry in the mixing tank 501 is prepared, the slurry valve 900 is opened, and under the action of the first grouting pump 6011 and the second grouting pump 6031, the slurry in the mixing tank 501 is sequentially injected through the first grouting pipe 601 and multiple second grouting pipes 602 into the grouting ports 700 on the ground corresponding to the first grouting pipe 601 and multiple second grouting pipes 602, making the slurry preparation and grouting process easy to adjust.

[0037] In some embodiments, reference Figure 3 and Figure 4The mixing tank 501 in this application is equipped with a stirring unit 5014. The bottom end of the stirring unit 5014 penetrates and extends into the mixing tank 501 to mix the coal gangue powder, fly ash, and water entering the mixing tank 501. The stirring unit 5014 includes a stirring shaft and stirring blades mounted on the stirring shaft. The stirring shaft is rotatably connected to the top wall of the mixing tank 501 via bearings. The top end of the stirring shaft, located outside the mixing tank 501, is driven by a drive motor. The structure and stirring of the stirring unit 5014 are existing technologies and are not innovative points of this application. Therefore, this application does not specifically limit them.

[0038] In the above embodiments, coal gangue powder, fly ash, and water are added to the slurry mixing tank 501 through the coal gangue inlet 5011, fly ash inlet 5012, and water inlet 5013, respectively. The coal gangue powder, fly ash, and water entering the slurry mixing tank 501 are stirred by the stirring unit 5014 to make the coal gangue powder, fly ash, and water more uniformly mixed, thereby improving the uniformity of the slurry and making the slurry more fluid.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A coal gangue recycling system, characterized in that, include: The gangue bin (200), crushing station (300), ball mill workshop (400), and grouting station (500) are connected in sequence by a conveying device (100). The gangue bin (200) is used to store coal gangue; The crushing station (300) is equipped with a crushing device (301), which is used to crush the coal gangue conveyed from the gangue bin (200) by the conveying device (100) to obtain coal gangue fragments; The ball mill workshop (400) is equipped with a ball milling device (401), which is used to grind the coal gangue fragments conveyed from the ball milling device (401) by the conveying device (100) to obtain coal gangue powder. The grouting station (500) is equipped with a grout mixing tank (501), which has a coal gangue powder inlet (5011), a fly ash inlet (5012) and a water inlet (5013) for mixing the coal gangue powder, fly ash and water into a grout. Grouting pipe body (600), one end of which is connected to the grout mixing tank (501) and the other end of which extends into the grouting hole (700) on the ground, for injecting the grout into the grouting hole (700) on the ground.

2. The coal gangue recycling system according to claim 1, characterized in that, A transfer station (800) is provided between the gangue bin (200) and the crushing station (300). The inlet and outlet of the transfer station (800) are respectively connected to the outlet of the gangue bin (200) and the inlet of the crushing station (300) through the conveying device (100). The transfer station (800) is used to pre-process the coal gangue transported therefrom the gangue bin (200) by the conveying device (100).

3. The coal gangue recycling system according to claim 1, characterized in that, The grouting pipe body (600) includes a first grouting pipe (601) and a plurality of second grouting pipes (602). One end of the first grouting pipe (601) is connected to the grout mixing tank (501), and a plurality of second grouting pipes (602) are sequentially connected to the pipe body of the first grouting pipe (601) near the grout mixing tank (501). The other end of the first grouting pipe (601) and the other end of the plurality of second grouting pipes (602) are both used to extend into the grouting holes (700) of the ground that correspond to them one by one. The first grouting pipe (601) and the plurality of second grouting pipes (602) are each equipped with a first grouting pump (6011).

4. The coal gangue recycling system according to claim 3, characterized in that, The other end of the first grouting pipe (601) can be connected to the third grouting pipe (603), and the end of the third grouting pipe (603) away from the first grouting pipe (601) is used to extend into the grouting hole (700) of the ground. The other end of each of the plurality of second grouting pipes (602) can be connected to a fourth grouting pipe (604), the end of the fourth grouting pipe (604) away from the second grouting pipe (602) being used to extend into the grouting hole (700) of the ground; The third grouting pipe (603) and the fourth grouting pipe (604) are each equipped with a second grouting pump (6031).

5. The coal gangue recycling system according to claim 4, characterized in that, There are multiple third grouting pipes (603), and the multiple third grouting pipes (603) are connected in sequence; There are multiple fourth grouting pipes (604), and the multiple fourth grouting pipes (604) are connected in sequence.

6. The coal gangue recycling system according to claim 3, characterized in that, One end of the first grouting pipe (601) is connected to the bottom of the grout mixing tank (501), and a grout valve (900) is provided on the pipe body near the grout mixing tank (501). A plurality of second grouting pipes (602) are sequentially connected to the pipe body of the first grouting pipe (601) near the grout valve (900).

7. The coal gangue recycling system according to any one of claims 1 to 6, characterized in that, The mixing tank (501) is equipped with a stirring unit (5014), the bottom end of which penetrates and extends into the mixing tank (501) to mix the coal gangue powder, fly ash and water that enter the mixing tank (501).

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