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CN113893933B - Aboveground crushing and underground pulping system and using method - Google Patents

Aboveground crushing and underground pulping system and using method Download PDF

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Publication number
CN113893933B
CN113893933B CN202111227982.4A CN202111227982A CN113893933B CN 113893933 B CN113893933 B CN 113893933B CN 202111227982 A CN202111227982 A CN 202111227982A CN 113893933 B CN113893933 B CN 113893933B
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underground
crushing
pulping
aboveground
output end
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CN113893933A (en
Inventor
朱磊
潘浩
古文哲
张新福
徐凯
李娟�
刘治成
宋天奇
秋丰岐
赵萌烨
王翰秋
袁超峰
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China Coal Energy Research Institute Co Ltd
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China Coal Energy Research Institute Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00Other disintegrating devices or methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02Feeding devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00Methods or devices for placing filling-up materials in underground workings

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The invention provides an aboveground crushing and underground pulping system and a using method thereof, wherein the system is used for placing a crushing system on a well, waste rock is conveyed into the crushing system through an aboveground feeding system to be crushed to form waste rock powder and then put into the well, the pulping system is arranged under the well, the waste rock powder is conveyed into a stirrer through the underground feeding system to be stirred and pulped, and then the waste rock powder flows into a feeding machine to be cached and stirred automatically, so that the aboveground crushing and underground pulping are realized, the aboveground crushing system is not limited by the position under the well on the well, the scale and fine crushing of the waste rock is realized, and the matching performance of the crushing system and the pulping system is enhanced; the invention avoids the problem of pipeline blockage caused by long-distance pipeline transportation and vertical pipe transportation of slurry, greatly reduces the pipeline transportation distance and ensures the stable transportation of slurry compared with the conventional aboveground crushing and pulping system.

Description

Aboveground crushing and underground pulping system and using method
Technical Field
The invention relates to the technical field of mining, in particular to an aboveground crushing underground pulping system and a using method thereof.
Background
With the implementation of green coal mining and the tightening of environmental protection policies, the slurry filling technology for safely, efficiently and environmentally disposing coal gangue is more and more accepted by coal enterprises as a slurry filling technology which can dispose coal gangue safely, efficiently and green on the premise of not influencing the normal production of a working face at present. At present, according to field test feedback and equipment investigation, the complete large-scale arrangement of an aboveground crushing and pulping system and an underground crushing and pulping system is respectively restricted by the pipe blockage safety caused by long-distance pipeline transportation and vertical slurry transportation, the coal safety requirement of the underground large-scale crushing system and the dust safety. Therefore, by combining actual requirements on site, a complete system arrangement for crushing the slurry underground on the well is provided to solve the problems of pipe blockage of slurry pipeline transportation, coal safety requirements of underground crushing equipment and the like.
Disclosure of Invention
Aiming at the problems of pipe blockage in slurry pipeline transportation and high coal safety requirement of underground crushing equipment in the prior art, the invention provides the underground pulping system for the underground crushing and the using method thereof, which have the advantages of simple structure and convenience in operation, and effectively solve the problems of pipe blockage in slurry pipeline transportation and high coal safety requirement of the underground crushing equipment.
The invention is realized by the following technical scheme:
an aboveground crushing underground pulping system comprises a control room and an aboveground crushing underground pulping system body, wherein the control room is connected with a power supply; the above-well crushing and under-well pulping system body comprises an above-well crushing system, an under-well pulping system and an above-well and under-well transportation unit; the underground pulping system is arranged in an underground pulping chamber, one end of the underground transportation unit is connected with the output end of the underground crushing system, and the other end of the underground transportation unit is connected with the input end of the underground pulping system;
the aboveground crushing system comprises a feeding system and a crushing system; the output end of the feeding system is connected to the input end of a crushing system, and the output end of the crushing system is connected to the input end of an uphole and downhole transportation unit;
the underground pulping system comprises an underground constant feeder, a pulping system and a water supply system; the input end of the underground constant feeder is connected to the output end of the aboveground and underground transportation unit, the output end of the underground constant feeder is connected to the pulping system, and the output end of the pulping system is connected to the underground goaf caving zone; the output end of the water supply system is connected to the pulping system;
the underground and aboveground transportation unit comprises an underground receiving hopper, a blanking hole and an underground receiving hopper which are sequentially communicated, the input end of the underground receiving hopper is connected to the output end of the crushing system, the output end of the underground receiving hopper is connected to the input end of the blanking hole, the output end of the blanking hole is connected to the input end of the underground receiving hopper, and the output end of the underground receiving hopper is connected to the input end of the underground quantitative feeder.
Preferably, a control system is arranged in the control chamber, the input end of the control system is connected with the signal input module, the output end of the control system is connected with the switching signal module, the variable frequency output module and the fixed frequency output module, and the output end of the fixed frequency output module is connected with the feeding system; the output end of the variable frequency output module is connected to the underground constant feeder; the output end of the switch signal module is respectively connected to the crushing system and the pulping system; the input end of the signal input module is respectively connected with the aboveground receiving hopper and the underground receiving hopper.
Preferably, a first transfer transmission mechanism is arranged between the feeding system and the crushing system; and a second transfer transmission mechanism is arranged between the crushing system and the aboveground receiving hopper.
Preferably, the feeding system comprises a waste bin and an aboveground feeding machine; the output end of the waste bin is assembled on the above-well feeder, and the output end of the above-well feeder is connected to the input end of the crushing system.
Preferably, a buffer device is arranged between the output end of the blanking hole and the underground receiving hopper.
Preferably, a feeding transmission mechanism is arranged between the underground constant feeder and the pulping system.
Preferably, the pulping system comprises a stirrer, a buffer storage feeding machine and a grouting pump; the input of mixer is connected the output of batcher in the pit, water supply system's output leads to on water piping connection to the mixer, the output of mixer is connected to the buffer memory material loading machine, the grouting pump sets up in the buffer memory material loading machine, and the output connecting tube of grouting pump, pipeline are connected to the goaf area that falls in the pit through the buffer memory material loading machine.
The use method of the aboveground crushing underground pulping system comprises the following steps of:
the feeding system conveys the gangue to the crushing system to crush the gangue to obtain gangue powder, and conveys the gangue powder to an aboveground receiving hopper;
the waste rock powder enters an underground receiving hopper and then is automatically put into a discharging hole, the waste rock powder enters the underground receiving hopper through the discharging hole and then enters an underground constant feeder through the underground receiving hopper, and the underground constant feeder conveys the waste rock powder into a pulping system in a constant quantity;
the pulping system is used for pulping the gangue powder, the control system is used for controlling the water supply system, and the quantitative water is injected into the pulping system and mixed with the gangue powder for pulping and stirring to obtain gangue slurry; and after the gangue slurry is pulped in the pulping system, caching the gangue slurry, and simultaneously conveying the cached gangue slurry to the caving zone of the underground goaf for grouting and filling.
Preferably, slurrying system includes mixer and buffer memory material loading machine, and waste rock powder ration is carried to the mixer in, and water supply system leads to pipe ration to the mixer injected water, mixes the stirring and obtains the waste rock slurry, the waste rock slurry is carried and is carried out the buffer memory in the buffer memory material loading machine, be equipped with the grouting pump in the buffer memory material loading machine, the waste rock slurry in the buffer memory material loading machine carries out the slip casting through the grouting pump to goaf caving zone in the pit and fills.
Preferably, the particle size of the gangue powder is 3mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides an aboveground crushing and underground pulping system and a using method thereof, wherein the system is used for placing a crushing system on a well, waste rock is conveyed into the crushing system through an aboveground feeding system to be crushed to form waste rock powder and then put into the well, the pulping system is arranged under the well, the waste rock powder is conveyed into a stirrer through the underground feeding system to be stirred and pulped, and then the waste rock powder flows into a feeding machine to be cached and stirred automatically, so that the aboveground crushing and underground pulping are realized, the aboveground crushing system is not limited by the position under the well on the well, the scale and fine crushing of the waste rock is realized, and the matching performance of the crushing system and the pulping system is enhanced; the invention avoids the problem of pipeline blockage caused by long-distance pipeline transportation and vertical pipe transportation of slurry, greatly reduces the pipeline transportation distance and ensures the stable transportation of slurry compared with the conventional aboveground crushing and pulping system.
Furthermore, the control system effectively controls the underground pulping system body for crushing the ground on the well, so that the ground is conveniently crushed and pulped cooperatively.
Furthermore, the first transshipment conveying mechanism and the second transshipment conveying mechanism improve the conveying performance between the feeding system and the crushing system and between the crushing system and the ground receiving hopper.
Furthermore, a buffer device is arranged between the output end of the discharging hole and the underground receiving hopper, so that the impact of the gangue powder dropping process on the underground receiving hopper is relieved.
Furthermore, a feeding transmission mechanism is arranged between the underground constant feeder and the pulping system, so that the transmission performance between the underground constant feeder and the pulping system is improved.
Furthermore, the pulping system improves the stirring of the gangue slurry and effectively pumps the gangue slurry to the underground goaf caving zone by the grouting pump through the pipeline.
The use method of the underground pulping system with the underground crushing function comprises the steps of crushing waste rocks on the ground, realizing large-scale and fine crushing of the waste rocks in the crushing system, and simultaneously enhancing the matching performance of the crushing system and the pulping system; gangue is crushed on the well, and pulping is carried out under the well, so that the space of the pulping chamber under the well is saved, and the pulping efficiency is improved.
Drawings
FIG. 1 is a diagram of an above-well crushing and down-well slurrying system according to the present invention;
fig. 2 is a schematic structural diagram of a control system according to the present invention.
In the figure: 1-a waste rock bin; 2-an aboveground feeder; 3-a first transfer transport mechanism; 4-a crushing system; 5-a second transfer transmission mechanism; 6-an aboveground receiving hopper; 7-a blanking hole; 8-a buffer device; 9-a downhole receiving hopper; 10-downhole constant feeder; 11-a feed transport mechanism; 12-a stirrer; 13-buffer loading machine; 14-grouting pump; 15-a pipeline; 16-a water pipe; 17-a slurrying chamber; 18-control room.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
in one embodiment of the invention, the underground slurry preparing system for the aboveground crushing is provided, has a simple structure and is convenient to operate, and the problems of pipe blockage in slurry pipeline transportation and high coal safety requirement of underground crushing equipment are effectively solved.
Specifically, the aboveground crushing underground pulping system comprises a control room 18 and an aboveground crushing underground pulping system body, wherein the control room 18 is connected with a power supply, as shown in figure 1; the above-well crushing and underground pulping system body comprises an above-well crushing system, an underground pulping system and an above-well and underground transportation unit; the underground pulping system is arranged in an underground pulping chamber 17, one end of the underground transportation unit is connected with the output end of the underground crushing system, and the other end of the underground transportation unit is connected with the input end of the underground pulping system;
the aboveground crushing system comprises a feeding system and a crushing system 4; the output end of the feeding system is connected to the input end of a crushing system 4, and the output end of the crushing system 4 is connected to the input end of an uphole and downhole transportation unit;
the underground pulping system comprises an underground constant feeder 10, a pulping system and a water supply system; the input end of the underground constant feeder 10 is connected to the output end of the underground transportation unit, the output end of the underground constant feeder 10 is connected to a pulping system, and the output end of the pulping system is connected to a goaf caving zone; the output end of the water supply system is connected to the pulping system;
the underground and aboveground transportation unit comprises an underground receiving hopper 6, a discharging hole 7 and an underground receiving hopper 9 which are sequentially communicated, the input end of the underground receiving hopper 6 is connected to the output end of the crushing system 4, the output end of the underground receiving hopper 6 is connected to the input end of the discharging hole 7, the output end of the discharging hole 7 is connected to the input end of the underground receiving hopper 9, and the output end of the underground receiving hopper 9 is connected to the input end of the underground quantitative feeder 10.
Specifically, a control system is arranged in the control room 18, as shown in fig. 2, an input end of the control system is connected with the signal input module, an output end of the control system is connected with the switching signal module, the variable frequency output module and the fixed frequency output module, and an output end of the fixed frequency output module is connected with the feeding system; the output end of the variable frequency output module is connected to the underground constant feeder 10; the output end of the switch signal module is respectively connected to the crushing system and the pulping system; the input end of the signal input module is respectively connected with the aboveground receiving hopper 6 and the underground receiving hopper 9.
Specifically, a first transfer transmission mechanism 3 is arranged between the feeding system and the crushing system 4; and a second transfer transmission mechanism 5 is arranged between the crushing system 4 and the aboveground receiving hopper 6.
Specifically, the feeding system comprises a waste rock bin 1 and an over-the-pit feeding machine 2; the output end of the waste rock bin 1 is assembled on the over-the-pit feeding machine 2, and the output end of the over-the-pit feeding machine 2 is connected to the input end of the crushing system 4.
Specifically, a buffer device 8 is arranged between the output end of the blanking hole 7 and the underground receiving hopper 9.
Specifically, a feeding transmission mechanism 11 is arranged between the underground constant feeder 10 and the pulping system.
Specifically, the pulping system comprises a stirrer 12, a buffer feeding machine 13 and a grouting pump 14; the input end of the stirrer 12 is connected with the output end of the underground constant feeder 10, the output end of the water supply system is connected to the stirrer 12 through a water pipe 16, the output end of the stirrer 12 is connected to the cache feeding machine 13, the grouting pump 14 is arranged in the cache feeding machine 13, the output end of the grouting pump 14 is connected with a pipeline 15, and the pipeline 15 is connected to an underground goaf caving zone through the cache feeding machine 13.
The invention also provides a use method of the aboveground crushing underground pulping system, and the aboveground crushing underground pulping system based on the aboveground crushing underground pulping system comprises the following steps:
the feeding system conveys the waste rock to the crushing system 4 to crush the waste rock to obtain waste rock powder, wherein the particle size of the waste rock powder is 3mm, and the waste rock powder is conveyed into the aboveground receiving hopper 6;
the waste rock powder enters an underground receiving hopper 6 and then is automatically put into a discharging hole 7, the waste rock powder enters an underground receiving hopper 9 from the discharging hole 7 and then enters an underground quantitative feeder 10 through the underground receiving hopper 9, and the underground quantitative feeder 10 quantitatively conveys the waste rock powder into a pulping system;
the pulping system is used for pulping the gangue powder, the control system is used for controlling the water supply system, and the quantitative water is injected into the pulping system and mixed with the gangue powder for pulping and stirring to obtain gangue slurry; and after the gangue slurry is pulped in the pulping system, caching the gangue slurry, and simultaneously conveying the cached gangue slurry to the caving zone of the underground goaf for grouting and filling.
Concretely, slurrying system includes mixer 12 and buffer memory material loading machine 13, and waste rock powder ration is carried to mixer 12 in, and water supply system leads to pipe ration to mixer 12 injected water, mixes the stirring and obtains the waste rock slurry, the waste rock slurry carries and carries out the buffer memory to buffer memory material loading machine 13 in, be equipped with grouting pump 14 in the buffer memory material loading machine 13, the waste rock slurry in the buffer memory material loading machine 13 carries out the slip casting and fills through grouting pump 14 through pipeline 15 pump sending to goaf caving zone in the pit.
Examples
Transferring the waste rock in the waste rock bin 1 into a crushing system 4 through an aboveground feeder 2 and a first transshipment conveying mechanism 3, crushing 50mm of waste rock into 3mm of waste rock powder in the crushing system 4, and enabling the waste rock powder to enter an aboveground receiving hopper 6 through a second transshipment conveying mechanism 5;
gangue powder in the underground receiving hopper 6 enters the underground receiving hopper 9 through the blanking hole 7, and a buffer device 8 is arranged between the blanking hole 7 and the underground receiving hopper 9;
when the stirring machine 12 starts to operate, the underground quantitative feeder 10 below the underground receiving hopper 9 conveys the gangue powder into the stirring machine 12 through the feeding conveying mechanism 11, and meanwhile, the control system injects water into the stirring machine 12 through the water pipe 16;
after the slurry in the stirrer 12 is uniformly stirred, the slurry enters a buffer feeding machine 13 for buffer storage, and finally the gangue slurry in the buffer feeding machine 13 is conveyed to a caving zone of the underground goaf through a pipeline 15 by a grouting pump 14.
In conclusion, the invention provides an underground pulping system for underground crushing and a using method thereof, the system prevents a crushing system 4 from being arranged on the ground, waste rocks are conveyed into the crushing system 4 through a feeding system to be crushed to form waste rock powder to be arranged underground, the pulping system is arranged underground, so that the underground cooperative crushing and pulping are realized, the underground crushing system is not limited by the underground position on the ground, the large-scale and fine crushing of the waste rocks is realized, and the matching performance of the crushing system and the pulping system is enhanced; the invention avoids the problem of pipeline blockage caused by long-distance pipeline transportation and vertical pipe transportation of slurry, greatly reduces the pipeline transportation distance and ensures the stable transportation of the slurry compared with the conventional aboveground crushing and pulping system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (8)

1. The underground pulping system is characterized by comprising a control room (18) and an underground pulping system body, wherein the control room is connected with a power supply; the above-well crushing and under-well pulping system body comprises an above-well crushing system, an under-well pulping system and an above-well and under-well transportation unit; the underground pulping system is arranged in an underground pulping chamber (17), one end of the underground conveying unit is connected with the output end of the underground crushing system, and the other end of the underground conveying unit is connected with the input end of the underground pulping system;
the aboveground crushing system comprises a feeding system and a crushing system (4); the output end of the feeding system is connected to the input end of a crushing system (4), and the output end of the crushing system (4) is connected to the input end of an uphole and downhole transportation unit;
the underground pulping system comprises an underground constant feeder (10), a pulping system and a water supply system; the input end of the underground constant feeder (10) is connected to the output end of the underground transportation unit, the output end of the underground constant feeder (10) is connected to a pulping system, and the output end of the pulping system is connected to a goaf caving zone; the output end of the water supply system is connected to the pulping system;
the underground and aboveground transportation unit comprises an underground receiving hopper (6), a blanking hole (7) and an underground receiving hopper (9) which are sequentially communicated, the input end of the underground receiving hopper (6) is connected to the output end of the crushing system (4), the output end of the underground receiving hopper (6) is connected to the input end of the blanking hole (7), the output end of the blanking hole (7) is connected to the input end of the underground receiving hopper (9), and the output end of the underground receiving hopper (9) is connected to the input end of the underground quantitative feeding machine (10);
a control system is arranged in the control room (18), the input end of the control system is connected with the signal input module, the output end of the control system is connected with the switching signal module, the variable frequency output module and the fixed frequency output module, and the output end of the fixed frequency output module is connected with the feeding system; the output end of the variable frequency output module is connected to an underground constant feeder (10); the output end of the switch signal module is respectively connected to the crushing system and the pulping system; the input end of the signal input module is respectively connected with an aboveground receiving hopper (6) and an underground receiving hopper (9);
and a buffer device (8) is arranged between the output end of the blanking hole (7) and the underground receiving hopper (9).
2. An aboveground crushing and downhole pulping system according to claim 1, wherein a first transfer transmission mechanism (3) is arranged between the feeding system and the crushing system (4); a second transfer transmission mechanism (5) is arranged between the crushing system (4) and the aboveground receiving hopper (6).
3. An uphole crushing downhole pulping system according to claim 1, characterized in that the feeding system comprises a gangue silo (1) and an uphole feeder (2); the output end of the waste rock bin (1) is assembled on the over-the-pit feeder (2), and the output end of the over-the-pit feeder (2) is connected to the input end of the crushing system (4).
4. An aboveground crushing and downhole pulping system according to claim 1, wherein a feeding and conveying mechanism (11) is arranged between the downhole constant feeder (10) and the pulping system.
5. An aboveground crushing downhole pulping system according to claim 1, characterized in that the pulping system comprises a blender (12), a buffer loader (13) and an injection pump (14); the output of batcher (10) in the pit is connected to the input of mixer (12), water supply system's output leads to pipe (16) and is connected to on mixer (12), the output of mixer (12) is connected to buffer memory material loading machine (13), grouting pump (14) set up in buffer memory material loading machine (13), and pipeline (15) are connected to the output of grouting pump (14), and pipeline (15) are connected to the goaf area that collapses in the pit through buffer memory material loading machine (13).
6. The use method of the aboveground crushing underground pulping system is based on the aboveground crushing underground pulping system of any one of claims 1 to 5, and is characterized by comprising the following steps:
the feeding system conveys the gangue to the crushing system (4) to crush the gangue to obtain gangue powder, and conveys the gangue powder to an aboveground receiving hopper (6);
the waste rock powder enters an underground receiving hopper (6) and then is automatically put into a discharging hole (7), the waste rock powder enters an underground receiving hopper (9) from the discharging hole (7) and then enters an underground quantitative feeder (10) through the underground receiving hopper (9), and the underground quantitative feeder (10) quantitatively conveys the waste rock powder into a pulping system;
the pulping system is used for pulping the gangue powder, the control system is used for controlling the water supply system, and the quantitative water is injected into the pulping system and mixed with the gangue powder for pulping and stirring to obtain gangue slurry; and after the gangue slurry is pulped in the pulping system, caching the gangue slurry, and simultaneously conveying the cached gangue slurry to the caving zone of the underground goaf for grouting and filling.
7. The use method of the above-ground crushing and underground pulping system according to claim 6, wherein the pulping system comprises a stirrer (12) and a buffer feeding machine (13), the waste rock powder is conveyed into the stirrer (12) in a quantitative mode, a water supply system injects water into the stirrer (12) in a quantitative mode through a water pipe for mixing and stirring to obtain waste rock slurry, the waste rock slurry is conveyed into the buffer feeding machine (13) for buffer storage, a grouting pump (14) is arranged in the buffer feeding machine (13), and the waste rock slurry in the buffer feeding machine (13) is pumped into a down-hole mining caving zone through a pipeline (15) through the grouting pump (14) for grouting and filling.
8. The method of using an above-well crushing downhole pulping system according to claim 6, wherein the gangue powder has a particle size of 3mm.
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CN114320374A (en) * 2022-01-11 2022-04-12 安徽马钢矿业资源集团姑山矿业有限公司 Conveying system from surface of guniting material to underground

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