CN217267673U - Phosphogypsum yard leachate seepage prevention structure - Google Patents

Abstract

The utility model discloses an ardealite yard leachate seepage prevention structure, belonging to the field of environmental engineering; the utility model discloses a bottom of reservior ground basic unit, anti-filtration layer, under membrane clay protective layer, HDPE prevention of seepage membrane, epimembranal fine sand protective layer, isolation layer. The invention discloses a seepage-proofing structure for percolate in a phosphogypsum yard, which is suitable for the seepage-proofing structures of solid products such as the phosphogypsum yard, a refuse landfill, uranium ores and the like, and has the advantages of simple construction process, good seepage-proofing effect, short construction period, environmental protection, energy conservation, cost conservation, wide application range and the like.

Description

Phosphogypsum yard leachate seepage prevention structure

Technical Field

The utility model relates to a building protection engineering technical field, concretely relates to ardealite stock yard filtration liquid seepage prevention structure.

Background

With the continuous development of science and technology, the rapid development of national economy, the gradual diversification of industrial structures and the increasingly prominent environmental pollution problem, especially the rapid increase of the generation amount of dangerous solid wastes, the environment on which human beings live is seriously damaged and polluted. They are directly or potentially harmful to living beings, drinking water, soil environments, water environments, and atmospheric environments, and these hazards include mainly corrosive, toxic, reactive, infectious, and other properties. The human health can be harmed and the ecological environment can be damaged due to the improper random dumping, utilization and disposal, and the potential harm to the human body is always the key point of environmental management of all countries and regions in the world due to the high environmental risk. The phosphogypsum is always the most important thing for environmental management of solid waste in China.

Phosphogypsum is solid waste residue generated when phosphorite is treated by sulfuric acid in the process of producing phosphoric acid, about 4-6 tons of gypsum are discharged per ton of phosphoric acid, about 2 hundred million tons of phosphogypsum slag are discharged per year all over the world at present, and more than 5000 million tons of phosphogypsum slag are discharged per year in China. The phosphogypsum is discharged or stockpiled, and pollutants such as fluorine, phosphorus, arsenic and the like in the phosphogypsum are leached out along with rainwater after being leached by rainwater and enter soil or rivers to cause pollution of surface water and underground water.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a phosphogypsum yard filtration liquid seepage prevention structure solves the problem that current phosphogypsum yard filtration liquid seepage produces serious pollution with outside groundwater exchange.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a phosphogypsum storage yard percolate seepage prevention structure sequentially comprises a base course at the bottom of a reservoir, a reverse filtration layer, a clay protection layer under the membrane, an HDPE seepage prevention membrane, a fine sand protection layer on the membrane, an isolation layer and phosphogypsum slag from bottom to top, wherein the base course 1 at the bottom of the reservoir is of a groove shape, the bottom slope is not less than 2 percent, and the compaction degree is not less than 93 percent.

Further, the reverse filtration layer sequentially comprises from bottom to top: the middle stone layer is laid on the bottom foundation layer, and the fine sand layer is laid under the clay protective layer under the membrane.

Further, the thickness of the middle stone layer is 50cm, and the particle size is 20-40 mm; the thickness of the small stone layer is 50cm, and the particle size is 5-20 mm; the thickness of the fine sand layer is 50cm, and the particle size is 0.075-5 mm.

Furthermore, a trapezoidal drainage blind ditch is preset in the medium stone layer, the width of the lower bottom of the blind ditch is 0.5m, the width of the upper bottom of the blind ditch is 1m, the height of the blind ditch is 0.5m, and the slope of the side edge is 1: 0.5; pure polyester geotextile is wrapped outside the trapezoid drainage blind ditch, a perforated floral tube is embedded in the center of the trapezoid drainage blind ditch, and the pure polyester geotextile is wrapped outside the perforated floral tube; the particle size of the crushed stone layer in the trapezoidal drainage blind ditch is 20 mm-60 mm.

Further, the clay protective layer under the film is formed by compacting clay with the thickness of 0.8m, the degree of compaction is not less than 94%, and the saturation permeability coefficient is not more than 1x10 ^-7 cm/s。

Further, the HDPE impermeable membrane is provided with three layers, wherein two outer layers comprise a high-density polyethylene synthetic material layer and a middle corrosion-resistant HDPE impermeable membrane.

Further, the fine sand protective layer on the film is formed by compacting fine sand with the thickness of 0.5m, and the compactness is not less than 94 percent

Compared with the prior art, the utility model discloses possess one of following beneficial effect:

1. the structure of the invention can completely isolate the phosphogypsum slag from the foundation soil, percolate in the phosphogypsum pile can quickly enter the seepage collecting channel through permeable concrete and a fine sand protective layer on the membrane, and the seepage collecting channel is connected with a collecting pipe network and a percolate storage pool and finally enters the pool to be reused by production devices in a plant area or to be subjected to sewage treatment, thereby effectively ensuring the stability of the phosphogypsum pile, prolonging the service life of the HDPE seepage-proof membrane and avoiding the environmental pollution problems of underground water, soil and the like;

2. the reverse filtering layer and the drainage blind ditch at the bottom of the phosphogypsum yard can effectively and quickly drain underground water, and prevent the underground water from bursting and bursting the HDPE impermeable membrane, so that the stability of the foundation and the durability of the impermeable membrane are improved;

3. the invention can well adapt to the uneven settlement of the foundation and ensure that the HDPE impermeable membrane is not torn and damaged when the foundation is settled;

4. the materials used in the invention are all environment-friendly materials, are harmless to constructors, underground water and underground soil, and are safe and sanitary;

the construction technology is mature, the process is simple, the mechanization degree is high, and the method is safe, reliable and high in efficiency.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view of the trapezoidal drainage blind ditch of the present invention.

Figure 3 is the anchoring diagram of the HDPE barrier film of the present invention.

Fig. 4 is the sectional view of the percolate collecting infiltration ditch of the utility model.

In the figure, 1-a reservoir bottom foundation layer, 2-a reverse filtration layer, 3-a clay protection layer under the membrane, 4-an HDPE impermeable membrane, 5-a fine sand protection layer on the membrane, 6-an isolation layer, 7-phosphogypsum slag, 8-a trapezoidal drainage blind ditch, 9-an HDPE perforated floral tube, 10-a full-length rubber cushion strip, 11-a full-length steel anchor pressing strip, 12-an expansion bolt and 13-a percolate collecting and seepage ditch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The specific embodiment is as follows:

the phosphogypsum storage yard leachate seepage-proofing structure as shown in the figure sequentially comprises a base course 1 at the bottom of the reservoir, a reverse filtration layer 2, a clay protection layer 3 under the membrane, an HDPE seepage-proofing film 4, a fine sand protection layer 5 on the membrane, an isolation layer 6 and phosphogypsum slag bodies 7 from bottom to top, wherein the base course 1 at the bottom of the reservoir is of a groove shape, the bottom slope is not less than 2 percent, and the compaction degree is not less than 93 percent. The base course 1 of the storehouse bottom is a main body of the whole anti-seepage structure, the base course 1 of the storehouse bottom is arranged into a groove shape, the bottom slope is not less than 2%, and the compactness is not less than 93%, so that the part on the base course can be better supported. The inverted filter layer is a graded gravel layer from fine to coarse. The inverted filter layer 2 is made of 3 layers of sand, gravel or pebble and other materials with different particle sizes, the particles are gradually increased along the flowing direction of liquid, and the particles of any layer are not allowed to pass through the pores of the adjacent thicker layer. In this design, the reverse filter layer 2) includes from bottom to top in proper order: the middle stone layer 21, the small stone layer 22 and the fine sand layer 23 are arranged on the reservoir bottom foundation layer 1, and the fine sand layer 23 is arranged under the clay protection layer 3 under the membrane. In order to better filter the liquid, the thickness of the medium stone layer 21 is 50cm, and the particle size is 20-40 mm; the thickness of the small stone layer 22 is 50cm, and the particle size is 5-20 mm; the thickness of the fine sand layer 23 is 50cm, and the particle size is 0.075-5 mm.

In the design, in order to facilitate drainage, trapezoidal drainage blind ditches 8 are preset in the middle stone layer 21, the lower bottoms of the blind ditches are 0.5m wide, the upper bottoms of the blind ditches are 1m wide, the heights of the blind ditches are 0.5m, and the slopes of the side edges are 1: 0.5; pure polyester geotextile is wrapped outside the trapezoid drainage blind ditch 8, and specifically the trapezoid drainage blind ditch 8 is made of 500g/m ² The pure terylene geotextile is wrapped, a perforated floral tube 9 is embedded in the center of the trapezoidal drainage blind ditch 8, the perforated floral tube 9 is a HDPE perforated floral tube 9 with DN100mm, and the perforated floral tube 9 is wrapped by 500g/m ² The pure dacron geotechnical cloth of (1), rubble layer particle diameter is 20mm ~60mm in trapezoidal drainage french drain (8), and perforation floral tube 9 sets up in the corner.

Furthermore, the clay protective layer 3 under the membrane is formed by compacting clay with the thickness of 0.8m, the degree of compaction is not less than 94%, and the saturated permeability coefficient after compacting is not more than 1x10 ^-7 cm/s, better anti-seepage performance can be achieved.

Preferably, the HDPE impermeable membrane 4 is made of a high-density polyethylene synthetic material, said HDPE impermeable membrane 4 being made of two sheets one membrane (400 g/m) resistant to corrosion ² /2mmHDPE/400g/m ² ) The overlapping width is not less than 0.1m, and when the steel anchor is installed, the rubber gasket is pressed on the steel anchor pressing strip through the through lengthAnd (5) compressing and fastening by using expansion bolts.

Further, the fine sand protective layer 5 on the film is formed by compacting fine sand with a thickness of 0.5m, and the degree of compaction is not less than 94%.

Through the statistics of reconstruction and extension projects of phosphogypsum storage yards, a series of environmental pollution problems are caused before standardized construction is not carried out on the fields by using the existing storage capacity of about 450 million tons and the height of the storage yard of about 60 m. After reconstruction, the reduction production is carried out according to the medium-long term planning of a certain enterprise, the current situation is reduced from 450 ten thousand tons to 150 ten thousand tons, and the total area of an anti-seepage system is 6.5 ten thousand meters ² The construction of the seepage-proofing system is 5 months, the process is simple, the mechanization degree is high, the construction speed is high, the quality is reliable, the problems of secondary environmental pollution and the like caused by seepage-proofing drainage guide measures missing or unreasonable treatment in the long-term use process of the phosphogypsum yard are effectively solved, the quality of domestic water production of the surrounding masses is ensured, and great social benefit and economic benefit are achieved.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the disclosure to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (7)

1. The utility model provides a ardealite stock yard filtration liquid prevention of seepage structure which characterized in that: the underground coal mine underground coal.

2. The phosphogypsum yard leachate seepage-proofing structure of claim 1, which is characterized in that: the inverted filter layer (2) sequentially comprises from bottom to top: the middle stone layer (21), the small stone layer (22) and the fine sand layer (23) are arranged, the middle stone layer (21) is laid on the reservoir bottom foundation layer (1), and the fine sand layer (23) is laid under the lower clay protection layer (3).

3. The phosphogypsum yard leachate seepage-proofing structure of claim 2, characterized in that: the thickness of the middle stone layer (21) is 50cm, and the particle size is 20-40 mm; the thickness of the small stone layer (22) is 50cm, and the particle size is 5-20 mm; the thickness of the fine sand layer (23) is 50cm, and the particle size is 0.075-5 mm.

4. The phosphogypsum yard leachate seepage-proofing structure of claim 2 or 3, characterized in that: a trapezoidal drainage blind ditch (8) is preset in the middle stone layer (21), the width of the lower bottom of the blind ditch is 0.5m, the width of the upper bottom of the blind ditch is 1m, the height of the blind ditch is 0.5m, and the slope of the side edge is 1: 0.5; pure terylene geotextile is wrapped outside the trapezoid drainage blind ditch (8), a perforated floral tube (9) is embedded in the center of the trapezoid drainage blind ditch (8), and the pure terylene geotextile is wrapped outside the perforated floral tube (9); the particle size of the crushed stone layer in the trapezoidal drainage blind ditch (8) is 20 mm-60 mm.

5. The phosphogypsum yard leachate seepage-proofing structure of claim 1, which is characterized in that: the clay protective layer (3) under the membrane is formed by compacting clay with the thickness of 0.8m, the compactness is not less than 94 percent, and the saturated permeability coefficient is not more than 1x10 ^-7 cm/s。

6. The phosphogypsum yard leachate seepage-proofing structure of claim 1, which is characterized in that: the HDPE impermeable membrane (4) is provided with three layers, wherein two outer sides comprise a high-density polyethylene synthetic material layer and a middle corrosion-resistant HDPE impermeable membrane.

7. The phosphogypsum yard leachate seepage-proofing structure of claim 1, which is characterized in that: the fine sand protective layer (5) on the film is formed by compacting fine sand with the thickness of 0.5m, and the compactness is not less than 94%.

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