Phosphogypsum storage yard leachate seepage-proofing structure

Abstract

The utility model discloses a phosphogypsum storage yard leachate seepage-proofing structure which comprises a foundation layer and a seepage-proofing drainage layer used for bearing phosphogypsum slag, the seepage-proofing drainage layer comprises a first thin film layer, a protective layer, a second thin film layer and an isolating layer, and the first thin film layer, the protective layer, the second thin film layer and the isolating layer are sequentially arranged from bottom to top. The mechanical layer comprises two parallel transverse bars and two parallel vertical bars, and the vertical bars are arranged on the inner surfaces of the transverse bars in a sliding mode. The mechanical layer capable of continuously compacting the soil is arranged below the anti-seepage drainage layer, the positions of the transverse bars and the vertical bars can be moved by rotating the two nuts, so that the soil in the middle area is reinforced, and by means of the mode, the anti-seepage drainage layer is arranged in a matched mode, so that the soil in the middle area is reinforced. The overall compressive strength and density of the compacted soil can be improved, the service life of the compacted soil is prolonged, and the long-time anti-seepage effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of building protection engineering technology, specifically to a seepage prevention structure for leachate from phosphogypsum stockpiles. Background Technology

[0002] Phosphogypsum is a solid waste residue produced during the treatment of phosphate rock with sulfuric acid in the production of phosphoric acid. For every ton of phosphoric acid produced, about 4-6 tons of phosphogypsum are discharged. Currently, the world discharges about 200 million tons of phosphogypsum residue every year, and my country discharges more than 50 million tons every year. When phosphogypsum is discharged or stored, pollutants such as fluorine, phosphorus, and arsenic are leached out by rainwater and enter the soil or rivers, causing pollution of surface water and groundwater.

[0003] Patent CN217267673U discloses a leachate seepage prevention structure for phosphogypsum stockpiles. This structure can completely isolate the phosphogypsum slag from the foundation soil. The leachate in the phosphogypsum stockpile can quickly pass through permeable concrete and a fine sand protective layer on the membrane into the seepage collection ditch. The seepage collection ditch is connected to the collection pipe network and the leachate storage tank, and finally enters the tank for reuse by the plant's production equipment or for wastewater treatment. This structure can effectively ensure the stability of the phosphogypsum stockpile, extend the service life of the HDPE geomembrane, and avoid environmental pollution problems such as groundwater and soil pollution. However, the compaction treatment of the base layer 1 at the bottom of the reservoir is only carried out during the excavation period. Long-term use will still lead to a decrease in the compaction degree of the base layer 1 at the bottom of the reservoir, affecting the subsequent seepage prevention effect. Utility Model Content

[0004] The purpose of this invention is to provide a seepage prevention structure for phosphogypsum stockpile leachate, in order to solve the problem mentioned in the background art that the compaction treatment of the base layer of the reservoir bottom is only carried out during the excavation period, and long-term use will still lead to a decrease in the compaction degree of the base layer of the reservoir bottom, affecting the subsequent seepage prevention effect.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: A seepage-proof structure for leachate from a phosphogypsum stockpile, comprising a base layer and a seepage-proof drainage layer for supporting the phosphogypsum slag. The seepage-proof drainage layer includes a first film layer, a protective layer, a second film layer, and an isolation layer, arranged sequentially from bottom to top. It also includes a mechanical layer located below the seepage-proof drainage layer for compacting and reinforcing the soil. The mechanical layer includes two parallel horizontal bars and two parallel vertical bars, with the vertical bars slidably disposed on the inner surface of the horizontal bars. The seepage-proof drainage layer, on the one hand, prevents pollutants from leaching out and protects the base layer; on the other hand, it allows for the discharge of accumulated wastewater. The two horizontal bars and the two vertical bars are positioned correspondingly.

[0006] Preferably, the protective layer is a sand cushion layer, the first and second film layers are both geomembranes, the isolation layer is an HDPE geomembrane, the first and second film layers are connected, and a suction port is fixedly provided inside the second film layer, with a one-way suction nozzle installed at the air outlet end of the suction port. The suction port is used to expel air between the first and second film layers, creating a vacuum, thereby increasing the overall strength of the protective layer.

[0007] Preferably, the seepage-proof drainage layer further includes a drainage ditch on the outer surface of the second film layer for pressing the second film layer. A corner plate is fixedly installed at the corner position inside the drainage ditch. A baffle plate is installed inside the drainage ditch and between two adjacent corner plates. The upper surface of the baffle plate contacts the lower surface of the corner plate. A first spring is installed in the middle of the lower surface of the baffle plate, and the baffle plate and the drainage ditch are elastically connected through the first spring. The end faces of the baffle plate and the end faces of the corner plates are offset from each other. The upper surface of the drainage ditch is flush with the upper surface of the isolation layer. The drainage ditch has a U-shaped cross-section, and the corner plate has an L-shaped cross-section.

[0008] Preferably, the seepage-proof drainage layer further includes a water-collecting pipe disposed outside the subgrade. A pumping pipe is fixedly installed on the outer surface of the bottom of the water-collecting pipe at each corner plate location, with the bottom end of the pumping pipe penetrating the corner plate and extending into the interior of the drainage ditch. A water outlet pipe is fixedly installed in the middle of the water-collecting pipe, and the outlet end of the water outlet pipe is connected to the inlet end of an external water pump. The water outlet pipe, water-collecting pipe, and pumping pipe are interconnected.

[0009] Preferably, a vertical pressure plate is fixedly disposed at the center of the outer surface of the vertical bar, and the outer surface of the vertical pressure plate is provided with a plurality of vertical spikes arranged at equal intervals, and the cross-section of the vertical spikes is designed as an isosceles triangle. The outer surface of the vertical pressure plate is provided with a plurality of second grooves arranged at equal intervals. The second grooves are used to increase the overall strength of the vertical pressure plate.

[0010] Preferably, threaded rods are fixedly installed at both ends of the inner surface of the crossbar, and nuts are installed on both sides of the outer surface of the threaded rods. A fixing steel is installed in the middle of the inner surface of the crossbar, and a horizontal pressure plate is installed in the middle of the outer surface of the crossbar. The outer surface of the horizontal pressure plate has multiple horizontal spikes arranged at equal intervals, and the cross-section of the spikes is an isosceles triangle. Multiple first grooves arranged at equal intervals are opened on the outer surface of the horizontal pressure plate. Multiple second springs arranged at equal intervals are installed inside the fixing steel. The horizontal pressure plate and the fixing steel are elastically connected by the second springs. Hook openings are opened on both sides of the inner surface of the fixing steel, and sliding hooks are fixedly installed on the outer surface of the horizontal pressure plate at each hook opening position. The nuts are used to clamp and fix the vertical bars, thereby shaping the two vertical bars and two crossbars. The sliding hooks are integrally formed with the horizontal pressure plate, and the cross-section of the sliding hooks is L-shaped.

[0011] Therefore, this utility model has the following beneficial effects: by setting a mechanical layer that can continuously compact the soil below the seepage prevention and drainage layer, the horizontal and vertical bars can be moved by rotating two nuts, thereby reinforcing the soil in the middle area. Using this method, in conjunction with the seepage prevention and drainage layer, the overall compressive strength and density of the compacted soil can be improved, the service life of the compacted soil can be increased, and the seepage prevention effect can be guaranteed for a long time. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the drainage ditch structure of this utility model.

[0014] Figure 3 This is a partial enlarged view of the seepage prevention and drainage layer of this utility model.

[0015] Figure 4 This is a partial enlarged view of the drainage ditch of this utility model.

[0016] Figure 5 This is a schematic diagram of the mechanical layer structure of this utility model.

[0017] Figure 6 This is a schematic diagram of the planar structure of the fixing steel and the horizontal pressure plate of this utility model.

[0018] In the diagram: 100, base layer; 200, seepage-proof drainage layer; 201, drainage ditch; 202, corner plate; 203, pumping pipe; 204, water collection pipe; 205, water outlet pipe; 206, baffle plate; 207, suction port; 208, one-way suction nozzle; 209, isolation layer; 210, protective layer; 211, first film layer; 212, second film layer; 213, first spring; 300, mechanical layer; 301, fixing steel; 302, vertical spike; 303, vertical bar; 304, nut; 305, vertical pressure plate; 306, horizontal pressure plate; 307, horizontal bar; 308, horizontal spike; 309, first groove; 310, threaded rod; 311, second groove; 312, hook; 313, sliding hook; 314, second spring. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1-6The diagram illustrates a leachate seepage prevention structure for a phosphogypsum stockpile, comprising a base layer 100 and a seepage prevention and drainage layer 200 for supporting the phosphogypsum slag. The base layer 100 is trough-shaped. The structure also includes a mechanical layer 300 located below the seepage prevention and drainage layer 200 for compacting and reinforcing the soil. The seepage prevention and drainage layer 200 comprises a first film layer 211, a protective layer 210, a second film layer 212, and an isolation layer 209, arranged sequentially from bottom to top. The protective layer 210 is a sand cushion layer. The first film layer 211 and the second film layer 212 are connected to the first film layer 211. Two thin film layers 212 are connected. Both the first thin film layer 211 and the second thin film layer 212 are geomembranes used to wrap the protective layer 210 and form a sealed cavity. The isolation layer 209 is an HDPE geomembrane used to isolate the phosphogypsum slag. A suction port 207 is fixedly installed inside the second thin film layer 212. A one-way suction nozzle 208 is installed at the air outlet end of the suction port 207 to discharge gas outward and prevent gas backflow. In use, workers can use an external air pump in conjunction with the one-way suction nozzle 208 and the suction port 207 to extract gas. The seepage prevention and drainage layer 200 also includes a second thin film layer. A drainage ditch 201 is formed on the outer surface of the second film layer 212 for pressing the second film layer 212. A corner plate 202 is fixedly installed at the corner position inside the drainage ditch 201. A baffle plate 206 is installed inside the drainage ditch 201 and between two adjacent corner plates 202 to block water inside the drainage ditch 201 and prevent backflow. The upper surface of the baffle plate 206 contacts the lower surface of the corner plate 202. A first spring 213 is installed in the middle of the lower surface of the baffle plate 206, and the baffle plate 206 and the drainage ditch 201 are elastically connected by the first spring 213. The end face of the baffle plate 206 is flush with the corner plate 202. The end faces of 2 are misaligned. The seepage prevention and drainage layer 200 also includes a water collection pipe 204 set outside the base layer 100. A water pumping pipe 203 is fixedly set on the outer surface of the bottom of the water collection pipe 204 and at each corner plate 202. The bottom end of the water pumping pipe 203 passes through the corner plate 202 and extends into the interior of the drainage ditch 201. A water outlet pipe 205 is fixedly set in the middle of the water collection pipe 204. The water outlet end of the water outlet pipe 205 is connected to the water inlet end of the external water pump. It is worth noting that the elastic force of the first spring 213 is only sufficient to support the set baffle plate 206. If external water flows in, the baffle plate 206 will still slide downward.The mechanical layer 300 includes two parallel horizontal bars 307 and two parallel vertical bars 303, arranged in a U-shape. The vertical bars 303 are slidably mounted on the inner surface of the horizontal bars 307. A vertical pressure plate 305 is fixedly mounted on the middle of the outer surface of the vertical bars 303, and the outer surface of the vertical pressure plate 305 is provided with multiple vertical spikes 302 arranged at equal intervals. The cross-section of each vertical spike 302 is an isosceles triangle structure. Each vertical spike 302 is integrally formed with the vertical pressure plate 305. The outer surface of the vertical pressure plate 305 is provided with multiple second grooves 311 arranged at equal intervals. Threaded rods 310 are fixedly mounted at both ends of the inner surface of the horizontal bars 307, and nuts 304 are provided on both sides of the outer surface of the threaded rods 310. A fixing steel 301 is provided in the middle of the inner surface of the horizontal bars 307, and the cross-section of the fixing steel 301 is I-shaped. The structure features a horizontal pressure plate 306 located in the center of the outer surface of the horizontal bar 307. Multiple equally spaced horizontal spikes 308 are arranged on the outer surface of the pressure plate 306, with each spike having an isosceles triangular cross-section. These spikes work in conjunction with the vertical spikes 302 to compress the soil to both sides. Multiple equally spaced first grooves 309 are formed on the outer surface of the pressure plate 306 to increase its overall strength. Multiple equally spaced second springs 314 are installed inside the fixing steel 301, elastically connecting the pressure plate 306 and the fixing steel 301. Hook openings 312 are formed on both sides of the inner surface of the fixing steel 301. Sliding hooks 313 are fixedly installed on the outer surface of the pressure plate 306 at each hook opening 312, guiding the pressure plate 306 in conjunction with the hook openings 312.

[0021] This invention features a mechanical layer 300 below the seepage-proof drainage layer 200, which continuously compacts the soil. By rotating two nuts 304, the horizontal bar 307 and vertical bar 303 can be moved to reinforce the soil in the central area. This method, combined with the seepage-proof drainage layer 200, improves the overall compressive strength and density of the compacted soil, increases its service life, and ensures long-term seepage prevention. Furthermore, by using a first spring 213 to elastically install a baffle 206 inside the drainage ditch 201, this invention reduces the possibility of backflow and ensures the normal operation of drainage.

[0022] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A seepage-proof structure for leachate from a phosphogypsum stockpile, comprising a base layer (100) and a seepage-proof drainage layer (200) for supporting the phosphogypsum slag, characterized in that, The seepage-proof drainage layer (200) includes a first film layer (211), a protective layer (210), a second film layer (212), and an isolation layer (209). The first film layer (211), the protective layer (210), the second film layer (212), and the isolation layer (209) are arranged in order from bottom to top. It also includes a mechanical layer (300) located below the seepage-proof drainage layer (200) and used for compacting and reinforcing the soil. The mechanical layer (300) includes two parallel horizontal bars (307) and two parallel vertical bars (303). The vertical bars (303) are slidably disposed on the inner surface of the horizontal bars (307).

2. The seepage prevention structure for phosphogypsum stockpile leachate according to claim 1, characterized in that: The protective layer (210) is a sand cushion layer, the first film layer (211) and the second film layer (212) are both geomembranes, the isolation layer (209) is an HDPE geomembrane, the first film layer (211) and the second film layer (212) are connected, and a suction port (207) is fixedly provided inside the second film layer (212), and a one-way suction nozzle (208) is installed at the air outlet end of the suction port (207).

3. The seepage prevention structure for leachate from a phosphogypsum stockpile according to claim 1, characterized in that: The seepage-proof drainage layer (200) further includes a drainage ditch (201) on the outer surface of a second film layer (212) and used to press the second film layer (212). A corner plate (202) is fixedly provided at the corner position inside the drainage ditch (201). A baffle plate (206) is provided inside the drainage ditch (201) and between two adjacent corner plates (202). The upper surface of the baffle plate (206) is in contact with the lower surface of the corner plate (202). A first spring (213) is provided in the middle of the lower surface of the baffle plate (206). The baffle plate (206) and the drainage ditch (201) are elastically set by the first spring (213). The end face of the baffle plate (206) is offset from the end face of the corner plate (202).

4. The seepage prevention structure for leachate from a phosphogypsum stockpile according to claim 1, characterized in that: The seepage-proof drainage layer (200) also includes a water collection pipe (204) set outside the base layer (100). A water pumping pipe (203) is fixedly set on the outer surface of the bottom of the water collection pipe (204) and at each corner plate (202). The bottom end of the water pumping pipe (203) passes through the corner plate (202) and extends into the interior of the drainage ditch (201). A water outlet pipe (205) is fixedly set in the middle of the water collection pipe (204), and the water outlet end of the water outlet pipe (205) is connected to the water inlet end of an external water pump.

5. The seepage prevention structure for leachate from a phosphogypsum stockpile according to claim 1, characterized in that: A vertical pressure plate (305) is fixedly provided in the middle of the outer surface of the vertical bar (303), and a plurality of vertical spikes (302) are provided on the outer surface of the vertical pressure plate (305) and arranged at equal intervals. The cross-section of the vertical spikes (302) is designed as an isosceles triangle. A plurality of second grooves (311) are provided on the outer surface of the vertical pressure plate (305) and arranged at equal intervals.

6. The seepage prevention structure for phosphogypsum stockpile leachate according to claim 1, characterized in that: Both ends of the inner surface of the crossbar (307) are fixedly provided with threaded rods (310), and both sides of the outer surface of the threaded rods (310) are provided with nuts (304). A fixing steel (301) is provided in the middle of the inner surface of the crossbar (307), and a horizontal pressure plate (306) is provided in the middle of the outer surface of the crossbar (307). The outer surface of the horizontal pressure plate (306) is provided with multiple horizontal spikes (308) arranged at equal intervals, and the cross section of the horizontal spikes (308) is designed as an isosceles triangle. The outer surface of the plate (306) is provided with a plurality of first grooves (309) arranged at equal intervals. The interior of the fixed steel (301) is provided with a plurality of second springs (314) arranged at equal intervals. The horizontal pressure plate (306) and the fixed steel (301) are elastically connected by the second springs (314). Hook openings (312) are provided on both sides of the inner surface of the fixed steel (301). The outer surface of the horizontal pressure plate (306) is fixedly provided with sliding hooks (313) at each hook opening (312).

Images