WO2020155524A1

WO2020155524A1 - Fully-mechanized coal-mining face mine shaft water resource utilization system and method for using same

Info

Publication number: WO2020155524A1
Application number: PCT/CN2019/091822
Authority: WO
Inventors: 黄艳利; 李巍; 翟文; 李俊孟; 董霁红; 马昆; 高华东; 韩震; 阮泽宇; 郭亚超; 扎伊泽小赛米尔; 张吉雄
Original assignee: 中国矿业大学
Priority date: 2019-02-01
Filing date: 2019-06-19
Publication date: 2020-08-06
Also published as: CN109761395A; ZA202105490B; AU2019425968B2; CN109761395B; AU2019425968A1

Abstract

A fully-mechanized coal-mining face mine shaft water resource utilization system, which is constituted by a coal-mining face wastewater and goaf area stagnant water collecting and purification system (5), a sludge treatment system, and a feedback control system. The mining-face wastewater and goaf area stagnant water collection and purification system (5) can be divided into four parts, namely a wastewater collecting area (17), a physical filtration area (14), a suspended matter treatment area (15), and a heavy metal ion treatment area (16). The sludge treatment system comprises a sludge suction pipe (32), a sludge pump (2), and a mechanical centrifuge (1). The feedback control system comprises an automatic control panel (3), a control line (34), an electric control valve, and a water pump. Also provided is a method for using the system, in which the pH of the suspended matter treatment area (15) is adjusted to 6-8, flocculants PAM and PAC are added, and starch xanthate is added to the heavy metal ion treatment area (16). This allows wastewater to be treated into industrial water and household water and achieves the goal of resource recovery and utilization of coal-mining face and goaf area wastewater.

Description

Mine water resources utilization system for fully mechanized mining face and its use method

Technical field

The present invention relates to the field of mine wastewater recycling and utilization, in particular to a system for utilizing water resources in a fully mechanized coal mining face and a use method thereof.

Background technique

In recent years, coal mining in eastern China has gradually shifted to central and western China, and coal mining has destroyed the environment where groundwater is stored, leading to the loss of groundwater resources, resulting in increasingly scarce water resources in water-scarce areas in the west. Longwall mining is the main coal mining method in our country. After the working face is pushed, a void-filled space is formed in the goaf. The water in the rock strata and fissures tends to gather in the goaf and form water accumulation in the goaf.

After the working face is pushed, cracks will inevitably appear in the roof and floor of the goaf. The cracks between the roof and the floor connect the goaf with the adjacent confined aquifer, and the water in the confined aquifer will enter the goaf. Water forms in the goaf. A large amount of dust will be generated in the coal mining process at the working face. The coal shearer and the working face support are equipped with spray dust suppression devices. The dust in the air is reduced by spraying, which will generate a large amount of dust reduction sewage. In the northwestern region, water resources are relatively scarce, which not only consumes a lot of water resources in mine production, but also damages the original water resources. The main pollutants in the goaf water and dustfall sewage at the working face are solid particles, suspended tiny particles and heavy metal ions. After the pollutants in the water are removed, the water in the goaf and the sewage from the production work surface are recycled, which not only saves water costs for mine production, but also alleviates the shortage of water resources. The traditional sewage treatment system can only use the water pump to pump the water in the sump to the ground for treatment, which not only takes up a lot of land resources, but also needs to transport clean water to the well when using water, which increases transportation costs. The accumulated water in the mine has not been used, and the accumulated water in the goaf has also brought potential pollution risks to the groundwater body. Therefore, there is a need for a water treatment system that can recycle the water accumulated in the goaf and the dust-fall sewage from the working face.

Summary of the invention

The purpose of the present invention is to provide a comprehensive mining face mine water resources utilization system and its use method, to collect the face sewage and the water in the goaf, and to purify the sewage into a clean water that meets the production water and water standards Water, to realize the utilization of water resources in fully mechanized mining face.

In order to achieve the above-mentioned purpose of the invention, the technical scheme of the invention is specifically as follows:

A system for utilizing water resources in a fully mechanized coal mining face includes a collection and purification system 5 for working face sewage and goaf water, a silt treatment system and a feedback control system, a domestic water delivery pipeline and a production water delivery pipeline.

The sewage and goaf water collection and purification system 5 includes a roadway floor drain 8, an isolation gangue metal grid 13, a horizontal partition plate 21, a vertical partition plate 23, and a filter metal grid 18. One end of the roadway floor channel 8 is located At the stop line, the other end is located at the open cut. The isolation gangue metal grid 13 is covered on the channel 8 of the roadway floor. The horizontal divider 21 is installed horizontally in the tunnel floor of the roadway 8 to divide the tunnel floor of the roadway 8 into upper and lower layers. The upper layer is the sewage collection area 17, and the lower layer is the physical filtration area 14, the suspended solids treatment area 15 and the metal ion treatment area 16. , And leave an opening near the end of the canal. Two vertical partition plates 23 separate the lower layer of the roadway floor drain 8 into three areas: a physical filtration area 14, a suspended matter processing area 15, and a metal ion processing area 16. A number of filter metal grids 18 with different pore diameters are vertically arranged in the physical filter zone 14;

A water pump 23 is provided in the physical filtration area 14, and the water pump 23 is used to pump the filtered water in the physical filtration area 14 into the suspended matter processing area into the suspended matter processing area 15. Microporous filter membrane 19, PH value detector 26 and turbidity detector 25 are arranged in the suspended matter treatment area 15. There is a water pump 24 in the suspended matter treatment area 15 for pumping purified water into the metal. Ion treatment zone 16. A reverse osmosis membrane 20, a metal ion detector one 35 and a metal ion detector two 27 are arranged in the metal ion treatment zone 16. The metal ion detector one 35 is arranged in the water inlet area of the metal ion treatment zone 16, and the metal ion detector two 27 It is arranged in the water outlet area of the metal ion treatment zone 16.

The production water outlet pipe 28 is in communication with the outlet area of the suspended solids treatment zone 15. The domestic water storage pipe 29 communicates with the water outlet area of the metal ion treatment zone 16. The sludge treatment system includes a sludge pumping pipe 32, a sludge pump 2 and a mechanical centrifuge 1. One end of the sludge pipe 32 is connected to the water inlet area of the suspended matter treatment area 15 and the water outlet area of the suspended matter treatment area 15 and metal ions through a branch pipe. The water inlet area of the treatment zone 16 is connected, and the other end of the sludge pumping pipe is connected to the sludge pump 2 arranged within the stop line of the mining tunnel; the sludge pump 2 is connected to the mechanical centrifuge 1 through a pipeline, and the sewage discharged from the mechanical centrifuge 1 Enter the sewage collection area 17 through the return pipe 33.

The feedback control system includes an automatic console 3, a control line 34, electronically controlled valves and water pumps. The automatic console 3 is arranged in the roadway stop line. The automatic console 3 is connected to the electronic control valve 9 and the electronic control through the control line 34. Valve two 10, electronic control valve three 11, electronic control valve four 12, water pump three 4, water pump four 23, water pump five 24, metal ion detector one 35, metal ion detector two 27, PH value detector 26 and turbidity The detector 25 is connected; the metal ion detector 35 is used to determine the amount of starch xanthate added, the PH detector 26 and the turbidity detector 25 are used to determine whether the water quality meets the water standard, when the water quality in the outlet area does not meet the standard When the time, the automatic console automatically closes the electronic control valve 2 10, opens the electronic control valve 4 12 and the water pump 3 4, so that the water in the suspended solids treatment area 15 is returned to the sewage collection area 17; the metal ion detector 2 27 is used to judge the water quality Whether it meets the water standard, when the water quality in the water outlet area does not meet the standard, the automatic console will automatically close the electronic control valve 9 and open the electronic control valve 311 and the water pump 34, so that the water in the metal ion treatment area 16 is returned to the sewage collection area 17 . The domestic water delivery pipeline is arranged in the underground tunnel. One end of the domestic water delivery pipeline is connected to the water outlet area of the metal ion treatment zone 15 of the working face sewage and goaf water collection and purification system 5, and one end is connected to the domestic water facilities. The production water transmission pipeline is arranged in the underground roadway, one end is connected to the water outlet area of the suspended solids treatment area 15 of the working face sewage and goaf water collection and purification system 5, and one end is respectively connected to the production water location of the underground working face.

Further, the width W of the bottom of the roadway 8 is 1/5 of the width of the roadway, and the depth

Among them, P is the amount of sewage discharged into the canal within 1 minute from the working face; Y is the amount of water flowing into the goaf within 1 minute.

Further, there are five filter metal grids 18, and the apertures of the five filter metal grids 18 are 10 ⁶ um, 10 ⁵ um, 10 ⁴ um, 10 ³ um, and 10 ² um in order along the water flow direction.

Further, the pore size of the microporous filter membrane 19 is 10 um.

A method for using a system for utilizing water resources in a fully mechanized mining face, including the steps:

S1: Working face sewage and goaf water flows into the tunnel floor drain 8 under gravity, and the goaf water and working face sewage flow through the isolation gangue metal grid 13 into the sewage collection area 17, and then into the physical filtration area 14. After being filtered by the physical classification filter metal grid 18, it is pumped into the suspended solids treatment area 15 by the water pump 23;

S2: Add acid-base regulator in the suspended solids treatment zone 15, adjust the pH of the water to 6-8, add PAM and PAC flocculants, the solid suspended solids react with PAM and PAC flocculants to form a precipitate. After the water is filtered by the microporous membrane 19, part of the water enters the production water delivery pipe 28, and part of the water is pumped into the metal ion treatment zone 16 by the water pump 24;

S3: In the heavy metal ion treatment zone 16, heavy metal ions in the water react with starch xanthate to form a precipitate, and the treated water enters the domestic water delivery pipe 29 after passing through the reverse osmosis membrane 20.

Further, the sequence of adding the treatment agent in the suspended solids treatment zone 15 is:

B1: Add the acid-base regulator through the acid-base regulator injection pipe 36 to adjust the pH value of the water to 6-8,

B2: Add the PAC flocculant through the PAM and PAC flocculant injection pipe 30, and finally add the PAM treatment agent, turn off the water pump 23 and the water pump 24 during the process of adding PAC and PAM flocculant; the mass of the added PAC flocculant m _pac ＝100q ₂ t ₂ , the mass of PAM flocculant added is m _pam = 2q ₂ t ₂ , where m _pac is the mass of PAC flocculant added, g; m _pam is the mass of PAM flocculant added, g; q ₂ is suspended matter The water flow in the treatment zone, m ³ /h; t ₂ is the time interval between two additions of PAC flocculant, h.

Further, the method of adding starch xanthate in the metal ion treatment zone 16 is:

Add starch xanthogenate to the metal ion treatment zone 16 through the starch xanthate injection pipe 31. In the process of adding starch xanthate, turn off the water pump 23 and the water pump 24. The molecular formula of the injected starch xanthate is It is cross-linked starch-O-CSS-Mg-SSC-cross-linked starch, the sulfur content of starch xanthate is 8.14%, and the quality of starch xanthate is

In the formula, m _d represents the quality of starch xanthate, g; t represents the time interval of starch xanthate, h; q ₁ represents the flow of water in the metal ion treatment zone m ³ /h, i represents the first i kind of metal ion; c _i represents the concentration of metal ion in the i-th, g/m ³ .

Compared with the prior art, the present invention has the following beneficial effects:

(1) After the working face dust-reducing sewage enters the working face dust-reducing sewage and the goaf water collection and purification device, after treatment, it enters the working surface water tank through the production water delivery pipe to realize the recycling of working water;

(2) Collecting and purifying the water in the goaf through the collection and purification device for dust and sewage from the working face and the water in the goaf, which not only basically eliminates the potential pollution risk of groundwater from the water in the goaf, but also realizes the goaf Resource utilization of stagnant water in the district.

(3) Purifying sewage into production water and domestic water, transporting domestic water to the above-well domestic water facilities, and transporting the production water to underground production water points, which improves the efficiency of water purification and eases the shortage of water in the mine.

Description of the drawings

Figure 1 is a schematic diagram of the layout of the mine water resource utilization system at a fully mechanized mining face;

Figure 2 is a vertical section view of the mine water resources utilization system of the fully mechanized mining face in Figure 1;

Figure 3 is a horizontal cross-sectional view of the upper layer of the tunnel floor drain in Figure 2;

Figure 4 is a horizontal cross-sectional view of the lower layer of the tunnel floor in Figure 2.

detailed description:

The present invention will be further described below with reference to the drawings.

Example 1

As shown in Figure 1-4, a comprehensive mining face mine water resource utilization system, a comprehensive mining face mine water resource utilization system, including working face sewage and goaf water collection and purification system 5. Silt Processing system and feedback control system, domestic water delivery pipeline and production water delivery pipeline.

The sewage and goaf water collection and purification system 5 includes a roadway floor drain 8, an isolation gangue metal grid 13, a horizontal partition plate 21, a vertical partition plate 23, and a filter metal grid 18. One end of the roadway floor channel 8 is located At the stop line, the other end is located at the open cut. The width W of the tunnel floor drain 8 is 1/5 of the width of the tunnel, and the depth

The isolation gangue metal grid 13 is covered on the channel 8 of the roadway floor. The horizontal divider 21 is installed horizontally in the tunnel floor of the roadway 8 to divide the tunnel floor of the roadway 8 into upper and lower layers. The upper layer is the sewage collection area 17, and the lower layer is the physical filtration area 14, the suspended solids treatment area 15 and the metal ion treatment area 16. , And leave an opening near the end of the canal. Two vertical partition plates 23 separate the lower layer of the roadway floor drain 8 into three areas: a physical filtration area 14, a suspended matter processing area 15, and a metal ion processing area 16. A number of filter metal grids 18 with different pore diameters are vertically arranged in the physical filter zone 14, and the pore diameter of the microporous filter membrane 19 is 10um.

The feedback control system includes an automatic console 3, a control line 34, electronically controlled valves, and water pumps. The automatic console 3 is arranged in the roadway stop line. The automatic console 3 is connected to the electronic control valve 9 and the electronic control valve through the control line 34. Valve two 10, electronic control valve three 11, electronic control valve four 12, water pump three 4, water pump four 23, water pump five 24, metal ion detector one 35, metal ion detector two 27, PH value detector 26 and turbidity The detector 25 is connected; the metal ion detector 35 is used to determine the amount of starch xanthate added, the PH detector 26 and the turbidity detector 25 are used to determine whether the water quality meets the water standard, when the water quality in the outlet area does not meet the standard When the time, the automatic console (3) automatically closes the electronic control valve two 10, opens the electronic control valve four 12 and the water pump three 4, so that the water in the suspended solids treatment area 15 is returned to the sewage collection area 17; the metal ion detector two 27 is used In judging whether the water quality meets the water standard, when the water quality in the outlet area does not meet the standard, the automatic console will automatically close the electronic control valve 9 and open the electronic control valve 311 and water pump 34, so that the water in the metal ion treatment zone 16 is returned to the sewage Collection area 17. The domestic water delivery pipeline is arranged in the underground tunnel. One end of the domestic water delivery pipeline is connected to the water outlet area of the metal ion treatment zone 15 of the working face sewage and goaf water collection and purification system 5, and one end is connected to domestic water facilities. The production water delivery pipeline is arranged in the underground roadway, one end is connected to the water outlet area of the suspended solids treatment area 15 of the working face sewage and goaf water collection and purification system 5, and one end is respectively connected to the production water location of the underground working face. Further, there are five filter metal grids 18, and the apertures of the five filter metal grids 18 are 10 ⁶ um, 10 ⁵ um, 10 ⁴ um, 10 ³ um, and 10 ² um in order along the water flow direction.

Example 2

The method for treating sewage with the system for utilizing water resources in a fully mechanized mining face in embodiment 1, includes the following steps:

Among them, the sequence of adding the treatment agent in the suspended solids treatment zone 15 is:

The method of adding starch xanthate in the metal ion treatment zone 16 is:

In the formula, m _d represents the quality of starch xanthogenate, g; t represents the time interval of starch xanthogenate, h; q ₁ represents the flow of water in the metal ion treatment zone m ³ /hI; represents the ith Kind of metal ion; c _i represents the concentration of metal ion in the i-th, g/m ³ .

After the dust-reducing sewage of the working face enters the collecting and purifying device 22 for the dust-reducing sewage of the working face and the accumulated water in the goaf, after treatment, it enters the working surface water tank through the production water conveying pipe to realize the recycling of working water. Collecting and purifying the water in the goaf through the collection and purification device 22 for collecting and purifying dust and sewage from the working face and the water in the goaf, not only basically eliminates the potential pollution risk of groundwater from the water in the goaf, but also realizes the accumulation of the goaf. Water resource utilization. Purifying sewage into production water and domestic water, transporting domestic water to the above-well domestic water facilities, and transporting the production water to underground production water points, which improves the efficiency of water purification and eases the shortage of water in the mine.

Example 3

This embodiment takes a mining roadway with a low elevation and a long-wall working face as an example for detailed description:

A longwall face, a lower elevation recovery roadway width 5m, the rear goaf water inflow Y is 0.20m ³ / min, the flow rate of waste water to the face P is 0.23m ³ / min, Mining The metal ions contained in the gushing water in the empty area are Cu ²⁺ , Zn ²⁺ , Ni ²⁺ , Cr ²⁺ , among which the concentration of Cu ²⁺ is 10 mg/L, the concentration of Zn ²⁺ is 12 mg/L, and the concentration of Ni ²⁺ 6mg/L, the concentration of Cr ²⁺ is 5mg/L.

Excavate the tunnel floor drain 8 in the roadway floor with lower elevation. The width of the channel W is 1m, and the depth of the channel

The water canal is divided into upper and lower layers by a horizontal partition 21, and the water canal is divided into 3 areas by a vertical partition in the lower layer of the canal. The upper layer of the canal is the sewage treatment area 17, and the lower layer of the canal is followed by the physical filtration area 14, the suspended solids treatment area 15, and the metal ion treatment area 16 along the water flow direction.

A starch xanthate injection pipe 31, a PAM and PAC flocculant injection pipe 30, and an acid-base regulator injection pipe 36 are arranged in the sewage collection area 17. The outlet of the starch xanthate injection pipe 31 passes through the horizontal partition plate 21 and enters the metal ion treatment zone 16, and the outlet of the PAM and PAC flocculant injection pipe 30 passes through the horizontal partition plate 21 and enters the suspended matter treatment area 15. The outlet of the regulator injection pipe 36 passes through the horizontal partition 21 and enters the suspended solids processing area 15. In the physical filter zone 14, five filter metal grids 18 with different apertures are vertically arranged, and the apertures of the metal grids along the water flow direction are 10 ⁶ um, 10 ⁵ um, 10 ⁴ um, 10 ³ um, and 10 ² um in order; The filtered water in the physical filtration zone 14 is pumped into the suspended matter treatment zone by a water pump 23. In the suspended matter treatment zone 15 are arranged a microporous membrane 19 with a pore size of 10um, a pH value detector 26, and one Turbidity detector 25; the purified water in the suspended solids treatment zone 15 is pumped into the metal ion treatment zone 16 by the water pump 24. The metal ion treatment zone 16 is arranged with a reverse osmosis membrane 20, a metal ion detector 35 and a metal ion detector 27. A metal ion detector 35 is arranged in the water inlet area of the metal ion treatment area 16, and a metal ion detector 27 is arranged in the water outlet area of the metal ion treatment area 16; the production water outlet pipe 28 and the suspended solids treatment area 15 The water outlet area is connected; the domestic water storage pipe 29 is connected to the water outlet area of the metal ion treatment zone 16.

A mechanical centrifuge 1, a sludge pump 2, an automatic console 3 and a water pump 4 are arranged in the stop line of the mining tunnel. The sludge pump 2 is connected to the bottom of the metal ion treatment zone 16, the bottom of the water inlet zone of the suspended matter treatment zone 15 and the bottom of the water outlet zone of the suspended matter treatment zone 15 through a sludge suction pipe 32. The sludge pump 2 is connected to the mechanical centrifuge through a pipeline. The sewage discharged from the mechanical centrifuge 1 flows into the sewage collection area 17 through the return pipe 33. The automatic console 3 is connected to the electronic control valve 9, electronic control valve 10, electronic control valve 11, electronic control valve 12, water pump 4, water pump 23, water pump 24, metal ion detector 35, metal ion detector 27, and Turbidity detector, turbidity detector and PH detector are connected.

If dosing once every 1h, the quality of PAC flocculant every time

m _pac ＝100q ₂ t ₂ ＝100×(P+Y)×1=100×(0.23+0.20)×60×1=2580g

The quality of each input of PAM flocculant

m _pam ＝2q ₂ t ₂ ＝2×(P+Y)×60×1=41.6g

The flow of water entering the metal ion treatment zone can be controlled by the water pump 24. Assuming that the flow entering the metal ion treatment zone 16 is 1/4 of the flow entering the suspended solids treatment zone 15, the quality of starch xanthate is put in each time

The domestic water delivery pipeline is arranged in the underground roadway, one end is connected to the water outlet area of the metal ion treatment zone 15 of the working face sewage and goaf water collection and purification system 5, and one end is connected to domestic water facilities. The production water delivery pipeline is arranged in the underground roadway, one end is connected to the water outlet area of the suspended solids treatment area 15 of the working face sewage and goaf water collection and purification system 5, and one end is respectively connected to the downhole working face spray pump, water tank, and equipment condensation Use water, dust-proof water, ground coal washing water and other production water locations.

Claims

A system for the utilization of water resources in a fully mechanized coal mining face, which is characterized in that it includes a collection and purification system (5) for working face sewage and goaf water, a silt treatment system and a feedback control system, a domestic water delivery pipeline, and production water Delivery pipeline

The collection and purification system (5) of working face sewage and goaf water collection and purification includes roadway floor drain (8), isolation gangue metal grid (13), horizontal partition plate (21), vertical partition plate (23) and filter metal Grid (18), one end of the roadway floor drain (8) is located at the stop line, and the other end is located at the cut hole;

The isolation gangue metal grid (13) is covered on the channel (8) of the roadway floor;

The horizontal divider (21) is installed horizontally in the tunnel (8) of the roadway floor, and divides the tunnel (8) into the upper and lower layers. The upper layer is the sewage collection area (17), and the lower layer is the physical filtration area (14), suspension Waste treatment area (15) and metal ion treatment area (16), and leave an opening near the end of the canal;

Two vertical partition plates (23) separate the lower layer of the tunnel floor drain (8) into three areas: physical filtration area (14), suspended matter treatment area (15), and metal ion treatment area (16);

A number of filter metal grids (18) with different pore diameters are vertically arranged in the physical filter area (14); the physical filter area (14) has a water pump one (23), and water pump one (23) is used to connect the physical filter area ( 14) The internally filtered water is pumped into the suspended solids treatment area and pumped into the suspended solids treatment area (15);

Microporous filter membrane (19), PH value detector (26) and turbidity detector (25) are arranged in the suspended matter treatment zone (15). The suspended matter treatment zone (15) is equipped with water pump two (24) and water pump Two (24) for pumping purified water into the metal ion treatment zone (16);

A reverse osmosis membrane (20), a metal ion detector one (35) and a metal ion detector two (27) are arranged in the metal ion treatment area (16), and the metal ion detector one (35) is arranged in the metal ion treatment area ( In the water inlet area of 16), the metal ion detector two (27) is arranged in the water outlet area of the metal ion treatment area (16);

The production water outlet pipe (28) is connected with the outlet area of the suspended solids treatment area (15);

The domestic water storage pipe (29) is connected with the water outlet area of the metal ion treatment zone (16);

The sludge treatment system includes a sludge suction pipe (32), a sludge pump (2) and a mechanical centrifuge (1). One end of the sludge pipe (32) is connected to the water inlet area and suspension area of the suspended matter treatment area (15) through a branch pipeline. The water outlet area of the waste treatment area (15) is connected to the water inlet area of the metal ion treatment area (16), and the other end of the sludge pumping pipe is connected to the sludge pump (2) arranged within the stop line of the mining roadway; the sludge pump ( 2) Connected to the mechanical centrifuge (1) through a pipeline, and the sewage discharged from the mechanical centrifuge (1) enters the sewage collection area (17) through the return pipe (33);

The feedback control system includes an automatic console (3), a control line (34), an electric control valve and a water pump. The automatic console (3) is arranged in the roadway stop line, and the automatic console (3) passes through the control line (34). And electronic control valve one (9), electronic control valve two (10), electronic control valve three (11), electronic control valve four (12), water pump three (4), water pump four (23), water pump five (24) ), metal ion detector one (35), metal ion detector two (27), PH value detector (26) and turbidity detector (25) are connected; metal ion detector one (35) is used to determine the dosage The amount of starch xanthate, the PH detector (26) and turbidity detector (25) are used to judge whether the water quality meets the water standard. When the water quality in the outlet area does not meet the standard, the automatic console (3) automatically turns off the electric control Valve two (10), open the electronic control valve four (12) and water pump three (4), so that the water in the suspended solids treatment area (15) is returned to the sewage collection area (17); the metal ion detector two (27) is used To judge whether the water quality meets the water standard, when the water quality in the water outlet area does not meet the standard, the automatic console (3) automatically closes the electronic control valve one (9), opens the electronic control valve three (11) and the water pump three (4) to make the metal ion The water in the treatment area (16) is returned to the sewage collection area (17);

The domestic water delivery pipeline is arranged in the underground tunnel. One end of the domestic water delivery pipeline is connected to the water outlet area of the metal ion treatment area (15) of the working face sewage and goaf water collection and purification system (5), and one end is connected to domestic water facilities ；

The production water delivery pipeline is arranged in the underground roadway, one end is connected to the water outlet area of the suspended solids treatment area (15) of the working face sewage and goaf water collection and purification system (5), and one end is connected to the production water of the underground working face. location.
The system for utilizing water resources in a fully mechanized mining face according to claim 1, characterized in that the width W of the bottom channel (8) of the roadway is 1/5 of the width of the roadway, and the depth
Among them, P is the amount of sewage discharged into the canal within 1 minute from the working face; Y is the amount of water flowing into the goaf within 1 minute.
The system for utilizing water resources in a fully mechanized mining face according to claim 1, characterized in that there are five filter metal grids (18), and the apertures of the five filter metal grids (18) are sequentially along the water flow direction. It is 10 6 um, 10 5 um, 10 4 um, 10 3 um, and 10 2 um.
The system for utilizing water resources in a fully mechanized coal mining face according to claim 1, wherein the pore size of the microporous filter membrane (19) is 10um.
A method for using a system for utilizing water resources in a fully mechanized mining face, which is characterized in that it comprises the steps:

S1: Working face sewage and goaf water flows into the tunnel floor drain (8) under gravity, the goaf water and working face sewage flow into the sewage collection area (17) through the isolation gangue metal fence (13), and then Flow into the physical filtration area (14), after being filtered by the physical classification filter metal grid (18), it is pumped into the suspended solids treatment area (15) by the water pump (23);

S2: Add acid-base regulator in the suspended solids treatment zone (15), adjust the pH of the water to 6-8, then add PAM and PAC flocculants, the solid suspended solids react with PAM and PAC flocculants to form a precipitate, and treat After the latter water is filtered by the microporous filter membrane (19), part of the water enters the process water delivery pipe (28), and part of the water is pumped into the metal ion treatment zone (16) by the water pump (24);

S3: In the heavy metal ion treatment zone (16), heavy metal ions in the water react with starch xanthogenate to form a precipitate, and the treated water enters the domestic water delivery pipe (29) after passing through the reverse osmosis membrane (20).
The method according to claim 5, characterized in that the sequence of adding the treatment agent in the suspended solids treatment zone (15) is:

B1: Add the acid-base regulator through the acid-base regulator feed pipe (36) to adjust the pH value of the water to 6-8,

B2: Add PAC flocculant through the PAM and PAC flocculant injection pipe (30), and finally add the PAM treatment agent, turn off the water pump (23) and water pump (24) during the process of adding PAC and PAM flocculant;

The mass of PAC flocculant added is m pac =100q 2 t 2 , the mass of PAM flocculant added is m pam ＝2q 2 t 2 , where m pac is the mass of PAC flocculant added, g; m pam is the addition of PAM flocculation The mass of the agent, g; q 2 is the water flow in the suspended solids treatment zone, m 3 /h; t 2 is the time interval between two additions of PAC flocculant, h.
The method according to claim 5, characterized in that the method of adding starch xanthate in the metal ion treatment zone (16) is:

Add starch xanthogenate to the metal ion treatment zone (16) through the starch xanthate injection tube (31). During the addition of starch xanthate, turn off the water pump (23) and the water pump (24), so The molecular formula of starch xanthogenate is cross-linked starch-O-CSS-Mg-SSC-cross-linked starch, the sulfur content of starch xanthate is 8.14%, and the quality of starch xanthate is
In the formula, m d represents the quality of starch xanthate, g; t represents the time interval of starch xanthate, h; q 1 represents the flow of water in the metal ion treatment zone m 3 /h; i represents the first i kind of metal ion; c i represents the concentration of metal ion in the i-th, g/m 3 .