Anti-seepage and overflow water treatment device and process for overflow pool of mine filling ore storage bin

Abstract

The invention relates to the technical field of overflow water treatment, in particular to an anti-seepage and overflow water treatment device and process for an overflow water pool of a mine filling ore storage bin, the device comprises a bed rock and the overflow water pool, the overflow water pool with an upward opening is arranged above the bed rock, and a cement mortar protection layer is laid on each of the four walls of the inner side of the overflow water pool. An anti-seepage structure is arranged below the cement mortar protection layer at the bottom of the overflow pool; a filter pressing mechanism is fixedly communicated with the outer side of the lower part of the overflow pool; in the filling ore storage bin material preparation process, ore storage bin overflow water enters the inner side of an overflow water pool, a sandy gravel layer, a composite geomembrane and a cement mortar protection layer are arranged on the inner side of the overflow water pool, a first layer of cement glue is arranged between the sandy gravel layer and the composite geomembrane, and a second layer of cement glue is arranged between the composite geomembrane and the cement mortar protection layer. And the overflow pool is subjected to seepage prevention, so that the problem that ore pulp overflow water entering the overflow pool is directly discharged underground to cause soil pollution is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of overflow water treatment, and in particular to an anti-seepage and overflow water treatment device and process for an overflow water pool of a mine filling ore bin. Background Art

[0002] The overflow water of slurry generated when filling the tailings bin in the mining void has been discharged into the overflow pool for many years. After the overflow water is clarified in the pool, the supernatant is used for mining production, and the tailings precipitated at the bottom of the reservoir are regularly cleaned by machinery and transported to the waste rock field for landfill treatment. Since there are no anti-seepage measures in the overflow pool, wastewater containing excessive heavy metal pollutants will seep into the ground, polluting the groundwater, the environment, and the soil, posing major safety hazards and environmental risks. The cost of cleaning the tailings at the bottom of the reservoir is very high. It is cleaned once every five years. Even if anti-seepage treatment is done, when the overflow pool needs to clean the precipitated tailings, the sand cleaning machinery and equipment will damage the anti-seepage membrane. The wastewater containing excessive heavy metal pollutants in the entire overflow pool will seep into the ground and pollute the environment. After cleaning the tailings at the bottom of the reservoir, it is necessary to re-lay the anti-seepage membrane on the bottom and sides of the reservoir, which is time-consuming and labor-intensive, affecting the normal production of the mine, repeated investment, huge costs, and polluting the environment. Summary of the invention

[0003] The present invention provides an anti-seepage and overflow water treatment device and process for a mine filling ore bin overflow pool, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that sewage is discharged into the ground and soil is polluted due to the lack of anti-seepage measures in the existing slurry overflow pool.

[0004] To solve the above problems, one of the technical solutions of the present invention is achieved in the following manner: an anti-seepage and overflow water treatment device for an overflow pool of a mine filling ore bin, comprising a bedrock and an overflow pool, an overflow pool with an opening facing upward is provided above the bedrock, a cement mortar protective layer is laid on the four inner walls of the overflow pool, and an anti-seepage structure is provided below the cement mortar protective layer at the bottom of the overflow pool; a filter press mechanism is fixedly connected to the outer side of the lower part of the overflow pool, a filter mechanism is fixedly connected to the output end of the filter press mechanism, and a clear water tank for receiving clear water after filtration is provided at the bottom of the filter mechanism; The anti-seepage structure includes a gravel layer, a sand and pebble layer and a composite geomembrane laid in sequence from bottom to top. A layer of cement glue is laid between the sand and pebble layer and the composite geomembrane, and a second layer of cement glue is laid between the composite geomembrane and a cement mortar protective layer at the bottom of the overflow pool. The bottom of the sand and pebble layer is laid together with the upper side of the bedrock.

[0005] The filter press structure comprises a filter press and a filter cake storage tank. The water outlet of the overflow tank is fixedly connected with the inlet of the filter press, and the filter cake storage tank is arranged at the bottom of the filter press.

[0006] The above-mentioned filtering mechanism includes a flocculant box, a sedimentation tank, a stirring motor, an agitator and a filter layer. The outlet of the filter press mechanism is fixedly connected to the sedimentation tank. A flocculant box fixedly connected to the sedimentation tank is provided above the sedimentation tank. An agitator is provided inside the sedimentation tank. A stirring motor with an output shaft passing through the sedimentation tank and connected to the agitator is provided above the sedimentation tank. A plurality of overflow holes that pass through the bottom of the sedimentation tank are provided. A filter layer is provided inside the sedimentation tank below the overflow hole. The clean water tank is located below the sedimentation tank.

[0007] The above also includes a first connecting pipe and a first valve. The first connecting pipe is fixedly connected between the outer side of the lower part of the overflow pool and the filter press mechanism, and the first valve is installed on the first connecting pipe.

[0008] The above also includes a second connecting pipe and a second valve. The second connecting pipe is fixedly connected between the filter pressing mechanism and the filter mechanism, and the second valve is installed on the second connecting pipe.

[0009] The above also includes a clean water outlet pipe and a third valve. The outer side of the lower part of the clean water tank is fixedly connected with a clean water outlet pipe, and the third valve is installed on the clean water outlet pipe.

[0010] The second technical solution of the present invention is achieved by the following method: a mine filling ore bin overflow pool anti-seepage and overflow water treatment process, comprising the following steps: Step 1: Inject overflow water into the filter press for filtration, and the filter cake enters the filter cake storage tank for temporary storage; Step 2: Heat the liquid produced after the filter press, and then enter the sedimentation tank for flocculation, sedimentation and filtration; Step 3: After heating the filtered liquid, continue heating, add special effects agent and coagulant, stir, and enter the clear water tank after reaction; Step 4: Allow the liquid in the clear water tank to settle naturally for 1 hour and then discharge it after reducing the mud.

[0011] The above second step specifically includes: Heat the liquid produced after filter pressing to 50-55°C; add sodium sulfide and flocculant into the sedimentation tank and stir, and filter through the filter layer after reaction; wherein, the amount of sodium sulfide added is 2-3.5kg / m³, the amount of flocculant added is 3-5.5kg / m³, and the reaction time is 30-40min.

[0012] In the third step, the temperature of the liquid heating is 50-55°C; the amount of the special agent added is 3-4kg / m³; the amount of the coagulant added is 1.5-3kg / m³; and the reaction time is 15-25min.

[0013] In the process of filling the ore bin and preparing materials, the overflow water of the ore bin enters the inner side of the overflow pool. The gravel layer, the sand and pebble layer, the composite geomembrane and the cement mortar protective layer arranged on the inner side of the overflow pool, as well as a layer of cement glue arranged between the sand and pebble layer and the composite geomembrane, and a second layer of cement glue arranged between the composite geomembrane and the cement mortar protective layer, prevent the overflow pool from being seeped, and prevent the overflow water of the ore slurry entering the overflow pool from being directly discharged into the ground, causing soil pollution.

[0014] In addition, the present invention sets a filter press mechanism and a filtering mechanism. The filter press mechanism dehydrates the overflow water, separates the filtrate and the filter residue after dehydration, and the generated filtrate enters the filtering mechanism, is flocculated and settled by the filtering mechanism, and then output to the clear water tank. The clear water after sedimentation in the clear water tank is reused for mining and mineral processing. The filter residue generated by the filter press and the solid generated by the flocculation and sedimentation are transported to the waste rock field for landfill treatment, thereby reducing the precipitation of heavy metals in the tailings and soil and water loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the front cross-sectional structure of Example 1 of the present invention.

[0017] Figure 2 It is a schematic diagram of the top structure of embodiment 1 of the present invention.

[0018] In the figure: 1-bedrock, 2-overflow pool, 3-cement mortar protective layer, 4-sand and gravel layer, 5-composite geomembrane, 6-first layer of cement glue, 7-second layer of cement glue, 8-filter press, 9-filter cake storage tank, 10-flocculant box, 11-sedimentation tank, 12-mixing motor, 13-mixer, 14-filter layer, 15-overflow hole, 16-first connecting pipe, 17-first valve, 18-second connecting pipe, 19-second valve, 20-clean water outlet pipe, 21-third valve, 22-clean water tank, 23-sand and gravel layer. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] Example 1: Figure 1-2As shown, the embodiment of the present invention discloses an anti-seepage and overflow water treatment device for an overflow pool of a mine filling ore bin, comprising a bedrock 1 and an overflow pool 2, wherein an overflow pool 2 with an opening facing upward is provided above the bedrock 1, a cement mortar protective layer 3 is laid on the four inner walls of the overflow pool 2, and an anti-seepage structure is provided below the cement mortar protective layer 3 at the bottom of the overflow pool 2; a filter press mechanism is fixedly connected to the outer side of the lower part of the overflow pool 2, a filter mechanism is fixedly connected to the output end of the filter press mechanism, and a clear water pool 22 for receiving clear water after filtration is provided at the bottom of the filter mechanism; the anti-seepage structure comprises a gravel layer 23, a sand and pebble layer 4 and a composite geomembrane 5 laid in sequence from bottom to top, a layer of cement glue 6 is laid between the sand and pebble layer 4 and the composite geomembrane 5, two layers of cement glue 7 are laid between the composite geomembrane 5 and a cement mortar protective layer 3 located at the bottom of the overflow pool 2, and the bottom of the sand and pebble layer 4 is laid together with the upper side of the bedrock 1.

[0021] Among them, the thickness of the cement mortar protective layer 3 can be 20mm; the first layer of cement glue 6 and the second layer of cement glue 7 can be an adhesive formed by mixing 20% ​​107 glue and cement mortar; the thickness of the sand and pebble layer 4 can be 100mm; the thickness of the gravel layer 23 can be 300mm, and during construction, concrete with a thickness of 25mm is sprayed on the gravel layer 23; the composite geomembrane 5 adopts a "two-cloth and one-film" composite geomembrane 5, which is not only simple to construct and can shorten the construction period, but also has strong adaptability and can adapt to various terrains and climatic conditions. In addition, it has good environmental protection performance and will not cause pollution to the surrounding environment.

[0022] like Figure 1 As shown, the filter press structure includes a filter press 8 and a filter cake storage tank 9. The water outlet of the overflow pool 2 is fixedly connected to the inlet of the filter press 8, and a filter cake storage tank 9 is provided at the bottom of the filter press 8. Thus, the overflow water enters the filter press 8, is filtered by the filter press 8, and the filtrate is discharged into the filter mechanism for further treatment, and the filter cake is discharged into the filter cake storage tank 9, which is convenient for transportation to the waste rock yard for unified treatment later.

[0023] like Figure 1 As shown, the filtering mechanism includes a flocculant box 10, a sedimentation tank 11, a stirring motor 12, an agitator 13 and a filter layer 14, the outlet of the filter press mechanism is fixedly connected to the sedimentation tank 11, a flocculant box 10 fixedly connected to the sedimentation tank 11 is provided above the sedimentation tank 11, an agitator 13 is provided inside the sedimentation tank 11, a stirring motor 12 with an output shaft passing through the sedimentation tank 11 and connected to the agitator 13 is provided above the sedimentation tank 11, a plurality of overflow holes 15 that penetrate inside and outside are opened at the bottom of the sedimentation tank 11, a filter layer 14 is provided inside the sedimentation tank 11 below the overflow holes 15, and a clean water tank 22 is located below the sedimentation tank 11.

[0024] Among them, by adding flocculant into the flocculant box 10, the flocculant enters the sedimentation tank 11, and the stirring motor 12 drives the agitator 13 to stir, so as to realize the flocculation and sedimentation of the liquid in the sedimentation tank 11. The liquid after flocculation and sedimentation enters the inner side of the clean water tank 22 through the overflow hole 15 and the filter layer 14. After sedimentation inside the clean water tank 22, the clean water is discharged for production use. The silt after flocculation and sedimentation is intercepted by the filter layer 14. When the filter layer 14 intercepts a lot of silt, the filter layer 14 can be disassembled, and the silt on it is dehydrated with clean water and placed in the filter cake storage tank 9 for temporary storage, so as to facilitate its later transportation to the waste rock yard for unified treatment.

[0025] like Figure 1 As shown, the first connecting pipe 16 and the first valve 17 are also included. The first connecting pipe 16 is fixedly connected between the lower outer side of the overflow pool 2 and the filter press mechanism, and the first valve 17 is installed on the first connecting pipe 16. Therefore, the opening and closing of the first valve 17 is used to control whether the overflow water in the overflow pool 2 needs to enter the filter press mechanism.

[0026] like Figure 1 As shown, the filter press mechanism and the filter mechanism are fixedly connected with the second connecting pipe 18, and the second valve 19 is installed on the second connecting pipe 18. Therefore, the opening and closing of the second valve 19 is used to control whether the filtrate generated by the filter press mechanism needs to enter the sedimentation tank 11.

[0027] like Figure 1 As shown, it also includes a clean water outlet pipe 20 and a third valve 21. The clean water outlet pipe 20 is fixedly connected to the outer side of the lower part of the clean water tank 22, and the third valve 21 is installed on the clean water outlet pipe 20. Therefore, the water outflow of the clean water outlet pipe 20 is controlled by opening and closing the third valve 21.

[0028] When the embodiment of the present invention is used, during the process of filling the ore bin and preparing materials, the overflow water from the ore bin enters the inner side of the overflow pool 2. The gravel layer 23, the sand and pebble layer 4, the composite geomembrane 5 and the cement mortar protective layer 3 arranged on the inner side of the overflow pool 2, as well as a layer of cement glue 6 arranged between the sand and pebble layer 4 and the composite geomembrane 5, and a second layer of cement glue 7 arranged between the composite geomembrane 5 and the cement mortar protective layer 3, prevent the overflow pool 2 from being seeped, thereby preventing the overflow water of the slurry entering the overflow pool 2 from being directly discharged into the underground, causing soil pollution.

[0029] In addition, the embodiment of the present invention sets a filter press mechanism and a filtering mechanism. The filter press mechanism dehydrates the overflow water, separates the filtrate and the filter residue after dehydration, and the generated filtrate enters the filtering mechanism, is flocculated and settled by the filtering mechanism, and then output to the clear water tank 22. The clear water after sedimentation in the clear water tank 22 is reused for mining and mineral processing. The filter residue generated by the filter press and the solid generated by the flocculation and sedimentation are transported to the waste rock field for landfill treatment, thereby reducing the precipitation of heavy metals in the tailings and soil and water loss.

[0030] Embodiment 2: The embodiment of the present invention discloses a process for preventing seepage and treating overflow water in a mine filling ore bin overflow pool 2, comprising the following steps: Step 1: Inject overflow water into filter press 8 for filtration, and filter cake enters filter cake storage tank 9 for temporary storage; Step 2: heating the liquid produced after the filter press, and then entering the sedimentation tank 11 for flocculation, sedimentation and filtration; Step 3: After heating the filtered liquid, continue heating, add special effects agent and coagulant, stir, and enter the clear water tank 22 after reaction; Step 4: Allow the liquid in the clear water tank 22 to settle naturally for 1 hour and then discharge it after reducing the mud.

[0031] The second step specifically includes: heating the liquid produced after the filter press to 50-55°C; adding sodium sulfide and flocculant to the sedimentation tank 11, stirring, and filtering through the filter layer 14 after the reaction; wherein the amount of sodium sulfide added is 2-3.5kg / m³, the amount of flocculant added is 3-5.5kg / m³, and the reaction time is 30-40min. During stirring, by setting the output intensity of the stirring motor 12, the stirrer 13 stirs with medium intensity, thereby accelerating the dissolution rate of sodium sulfide and the separation rate of flocs.

[0032] Among them, in the second step, the liquid generated after the filter pressing is heated by steam heating, and the temperature of the heated liquid can be detected by a thermometer.

[0033] Among them, in the third step, the temperature of liquid heating is 50-55°C; the special agent can be PAC (polyaluminium chloride), and the addition amount is 3-4kg / m³; the coagulant can be PAM (polyacrylamide), and the addition amount is 1.5-3kg / m³; the reaction time is 15-25min.

[0034] The process of the present invention can effectively solve the problem that overflow water contains relatively high levels of heavy metals and polluting elements and cannot be discharged stably up to standard, thereby making the heavy metal discharge concentration lower than the standard limit requirements and reducing the risk of environmental pollution.

Claims

1. A device for preventing seepage and treating overflow water in a mine filling ore bin overflow pool, characterized in that: It includes bedrock and an overflow pool. An overflow pool with an opening facing upward is opened above the bedrock. A cement mortar protective layer is laid on the four inner walls of the overflow pool. An anti-seepage structure is arranged below the cement mortar protective layer at the bottom of the overflow pool. A filter press mechanism is fixedly connected to the outer side of the lower part of the overflow pool. A filter mechanism is fixedly connected to the output end of the filter press mechanism. A clear water pool for receiving clear water after filtration is arranged at the bottom of the filter mechanism. The anti-seepage structure includes a gravel layer, a sand and pebble layer and a composite geomembrane laid in sequence from bottom to top. A layer of cement glue is laid between the sand and pebble layer and the composite geomembrane. Two layers of cement glue are laid between the composite geomembrane and a cement mortar protective layer at the bottom of the overflow pool. The bottom of the sand and pebble layer is laid together with the upper side of the bedrock.

2. The anti-seepage and overflow water treatment device for the overflow pool of the mine filling ore bin according to claim 1 is characterized in that: The filter press structure comprises a filter press and a filter cake storage tank. The water outlet end of the overflow tank is fixedly connected with the inlet end of the filter press, and a filter cake storage tank is arranged at the bottom of the filter press.

3. The anti-seepage and overflow water treatment device for the overflow pool of the mine filling ore bin according to claim 1 is characterized in that: The filtering mechanism includes a flocculant box, a sedimentation tank, a stirring motor, an agitator and a filter layer. The outlet of the filter press mechanism is fixedly connected to the sedimentation tank. A flocculant box fixedly connected to the sedimentation tank is provided above the sedimentation tank. An agitator is provided inside the sedimentation tank. A stirring motor with an output shaft passing through the sedimentation tank and connected to the agitator is provided above the sedimentation tank. A plurality of overflow holes that pass through the bottom of the sedimentation tank are provided. A filter layer is provided inside the sedimentation tank below the overflow hole. The clean water tank is located below the sedimentation tank.

4. The anti-seepage and overflow water treatment device for the overflow pool of the mine filling ore bin according to claim 1 is characterized in that: It also includes a first connecting pipe and a first valve. The first connecting pipe is fixedly connected between the outer side of the lower part of the overflow pool and the filter press mechanism, and the first valve is installed on the first connecting pipe.

5. The anti-seepage and overflow water treatment device for the overflow pool of the mine filling ore bin according to claim 1, characterized in that: It also includes a second connecting pipe and a second valve. The second connecting pipe is fixedly connected between the filter pressing mechanism and the filter mechanism, and the second valve is installed on the second connecting pipe.

6. The device for preventing seepage and treating overflow water of a mine filling ore bin overflow pool according to claim 1, characterized in that: It also includes a clean water outlet pipe and a third valve. The outer side of the lower part of the clean water tank is fixedly connected with the clean water outlet pipe, and the third valve is installed on the clean water outlet pipe.

7. A process for preventing seepage and treating overflow water from an overflow pool of a mine filling ore bin, characterized in that: The following steps are involved: Step 1: Inject overflow water into the filter press for filtration, and the filter cake enters the filter cake storage tank for temporary storage; Step 2: Heat the liquid produced after the filter press, and then enter the sedimentation tank for flocculation, sedimentation and filtration; Step 3: After heating the filtered liquid, continue heating, add special effects agent and coagulant, stir, and enter the clear water tank after reaction; Step 4: Allow the liquid in the clear water tank to settle naturally for 1 hour and then discharge it after reducing the mud.

8. The process for preventing seepage and treating overflow water from an overflow pool of a mine filling ore bin according to claim 7, characterized in that: The second step specifically includes: Heat the liquid produced after filter pressing to 50-55°C; add sodium sulfide and flocculant into the sedimentation tank and stir, and filter through the filter layer after reaction; wherein, the amount of sodium sulfide added is 2-3.5kg / m³, the amount of flocculant added is 3-5.5kg / m³, and the reaction time is 30-40min.

9. The process for preventing seepage and treating overflow water from a mine filling ore bin overflow pool according to claim 7, characterized in that: In the third step, the temperature of the liquid heating is 50-55°C; the amount of the special effect agent added is 3-4kg / m³; the amount of the coagulant aid added is 1.5-3kg / m³; and the reaction time is 15-25min.

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