Mine rockfill ecological restoration method based on ardealite recycling

Abstract

The invention discloses a mine rockfill ecological restoration method based on ardealite recycling, and belongs to the technical field of mine ecological restoration. The method comprises the steps that firstly, a mine rockfill body is filled in a mine pit, secondly, clay slurry and ardealite slurry are filled in gaps of the rockfill body through a grouting technology, the ardealite slurry is wrapped by clay slurry layers at the bottom and a side slope and a clay slurry layer at the top, and finally, cultivation and planting soil is backfilled on the clay slurry layer at the top. The clay slurry layer formed by the cement, the clay, the fly ash, the ardealite, the calcium chloride and the water glass serves as an anti-seepage structure layer for sealing the ardealite slurry, the ardealite slurry is wrapped, the ardealite in the abandoned stone body is prevented from overflowing, and the moisture in the abandoned stone body is kept. In addition, the clay slurry layer and the iron tailings, the alkaline residues and the organic fertilizer in the ardealite slurry cooperate to fix F ions of the ardealite and improve the pH value, so that the effect of dual protection is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine ecological restoration, and specifically relates to a mine rockfill ecological restoration method based on phosphogypsum resource utilization. Background Art

[0002] When ecological backfill restoration is carried out on mine waste rock, since the mine waste rock occupies a large area and has a large volume, and the voids account for about 25% of the volume of the rockfill body, the mine waste rock cannot store water, making ecological management difficult.

[0003] Phosphogypsum is a byproduct of phosphate mining. A large amount of phosphogypsum cannot be effectively utilized and is piled up idle. The open-air pile has a negative impact on the surrounding ecological environment and causes a waste of resources. Phosphogypsum is used as a resource to fill the gaps in the abandoned rock to achieve the purpose of retaining moisture. However, phosphogypsum is often accompanied by harmful pollutants such as fluorine and acid, and the phosphogypsum in the abandoned rock overflows under the influence of water gravity, making it impossible to achieve ecological restoration. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for ecological restoration of mine rockfill bodies based on the resource utilization of phosphogypsum.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0007] (1) Filling the mine rockfill body in the mine pit, setting grouting holes on the filled mine rockfill body, and then grouting clay slurry on the bottom and slope of the mine pit through the grouting holes to form a clay slurry layer on the bottom and slope after solidification;

[0008] (2) Grouting phosphogypsum slurry into the cavity formed by the clay slurry layer at the bottom and the slope through the grouting holes to fill the gaps between the mine rockfill bodies in the cavity;

[0009] (3) After the phosphogypsum slurry on the cavity surface solidifies, clay slurry is poured into the top of the cavity to form a clay slurry layer on the top;

[0010] (4) Finally, the top clay slurry layer is backfilled with cultivated soil, and vegetation is planted on the cultivated soil.

[0011] After the mine rock pile is filled in the mine pit of the present invention, clay slurry and phosphogypsum slurry are used to fill the gaps in the stone body through grouting technology, wherein the clay slurry layer at the bottom and the slope and the clay slurry layer at the top wrap the phosphogypsum slurry inside, and then the top clay slurry layer is backfilled with cultivated soil. The clay slurry layer at the top contains plant seeds, and the variety of vegetation can be selected according to the local climate and actual conditions. The amount of plant species in the clay slurry layer at the top can be mixed according to actual needs. The thickness of the cultivated soil can also be selected according to actual needs. More preferably, the thickness of the filled cultivated soil is 0.3-0.5m.

[0012] As a preferred embodiment of the present invention, the grouting holes are arranged by drilling or pre-embedding.

[0013] As a preferred embodiment of the present invention, the clay slurry includes 100 parts by weight of water, 6-9 parts by weight of cement, 92-108 parts by weight of clay, 7-9 parts by weight of fly ash, 14-17 parts by weight of phosphogypsum, 0.3-0.5 parts by weight of calcium chloride and 0.4-0.6 parts by weight of water glass.

[0014] As a preferred embodiment of the present invention, the thickness of the clay slurry layer at the bottom and the slope, and the clay slurry layer at the top can be set according to actual conditions, and can be set to 2m-5m.

[0015] As a preferred embodiment of the present invention, the phosphogypsum slurry comprises 50-65 parts by weight of water, 65-98 parts by weight of phosphogypsum, 5-8 parts by weight of iron tailings, 5-9 parts by weight of alkali residue, 6-9 parts by weight of cement and 3-8 parts by weight of organic fertilizer;

[0016] The organic fertilizer comprises the following raw materials: 30-65 parts by weight of kitchen waste, 35-70 parts by weight of straw and 1-2 parts by weight of Bacillus licheniformis strains.

[0017] As a preferred embodiment of the present invention, the method for preparing the organic fertilizer comprises: mixing kitchen waste, straw and Bacillus licheniformis, and then fermenting the mixture at room temperature for 2 weeks.

[0018] As a preferred embodiment of the present invention, the viable bacterial count of the Bacillus licheniformis strain is 7×10 9 ~7.2×10 9 CFU / g.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The present invention uses a clay slurry layer formed by cement, clay, fly ash, phosphogypsum, calcium chloride and water glass as an anti-seepage structural layer for sealing the phosphogypsum slurry, which can prevent the phosphogypsum in the abandoned rock body from overflowing under the influence of water gravity and is beneficial to the retention of moisture in the abandoned rock body.

[0021] (2) The present invention forms phosphogypsum slurry from phosphogypsum, iron tailings, alkali slag, cement and organic fertilizer, which can fill the voids in the abandoned rock and retain moisture on the one hand; on the other hand, it can improve the fluoride ion pollution and acid pollution caused by phosphogypsum and will not affect the growth of plants planted on the cultivated soil.

[0022] (3) The present invention adopts a structure in which a clay slurry layer is wrapped around the phosphogypsum slurry. The clay slurry layer not only plays an anti-seepage role, but also can cooperate with the iron tailings, alkali residue and organic fertilizer in the phosphogypsum slurry to fix F ions and improve the pH to 6.8-7.0, thereby achieving a double protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the mine rockfill ecological restoration model constructed based on the mine rockfill ecological restoration method based on the resource utilization of phosphogypsum. DETAILED DESCRIPTION

[0024] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0025] Example 1

[0026] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0027] (1) Preparation of clay slurry: 100 parts by weight of water, 8 parts by weight of aluminate cement, 98 parts by weight of clay, 8 parts by weight of fly ash, 15 parts by weight of phosphogypsum, 0.4 parts by weight of calcium chloride and 0.5 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0028] (2) preparing phosphogypsum slurry: 50 parts by weight of kitchen waste, 53 parts by weight of straw and 1.5 parts of Bacillus licheniformis were mixed, and then fermented at room temperature for 2 weeks to obtain organic fertilizer; then 80 parts by weight of phosphogypsum, 6 parts by weight of iron tailings, 8 parts by weight of alkali residue, 8 parts by weight of aluminate cement and 6 parts by weight of organic fertilizer were added to 60 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0029] (3) Fill the mine rockfill body in the mine pit of the abandoned rock dump, and reasonably distribute the drilling (grouting hole) position and drilling depth according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: drill grouting holes on the filled mine rockfill body, and grout clay slurry on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed at the bottom and slope. The thickness of the clay slurry layer is 2m.

[0030] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 3m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the pit.

[0031] (5) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 2.5m.

[0032] (6) Finally, fill the top clay slurry layer with 0.5m of cultivated soil.

[0033] The cultivated soil is soil for plant growth, and the plant seeds in this embodiment are vine seeds.

[0034] Example 2

[0035] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0036] (1) Preparation of clay slurry: 100 parts by weight of water, 6 parts by weight of ferroaluminate cement, 108 parts by weight of clay, 7 parts by weight of fly ash, 14 parts by weight of phosphogypsum, 0.3 parts by weight of calcium chloride and 0.6 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0037] (2) preparing phosphogypsum slurry: 30 parts by weight of kitchen waste, 70 parts by weight of straw and 2 parts of Bacillus licheniformis were mixed, and then fermented at room temperature for 2 weeks to obtain organic fertilizer; then 65 parts by weight of phosphogypsum, 5 parts by weight of iron tailings, 9 parts by weight of alkali residue, 6 parts by weight of ferroaluminate cement and 3 parts by weight of organic fertilizer were added to 65 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0038] (3) The mine rockfill is filled in the mine pit of the abandoned rock dump, and the drilling positions and drilling depths are reasonably distributed according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: grouting holes are drilled on the filled mine rockfill, and clay slurry is grouted on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed on the bottom and slope. The thickness of the clay slurry layer is 4m.

[0039] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the mine pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 2.3 m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the mine pit.

[0040] (5) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 2m.

[0041] (6) Finally, fill the top clay slurry layer with 0.3m of cultivated soil.

[0042] The cultivated soil is soil for plant growth, and the plant seeds in this embodiment are vine seeds.

[0043] Example 3

[0044] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0045] (1) Preparation of clay slurry: 100 parts by weight of water, 9 parts by weight of aluminate cement, 98 parts by weight of clay, 9 parts by weight of fly ash, 17 parts by weight of phosphogypsum, 0.5 parts by weight of calcium chloride and 0.4 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0046] (2) preparing phosphogypsum slurry: 65 parts by weight of kitchen waste, 35 parts by weight of straw and 1 part of Bacillus licheniformis were mixed, and then fermented at room temperature for 2 weeks to obtain organic fertilizer; then 98 parts by weight of phosphogypsum, 8 parts by weight of iron tailings, 5 parts by weight of alkali residue, 9 parts by weight of aluminate cement and 8 parts by weight of organic fertilizer were added to 50 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0047] (3) Fill the mine rockfill in the mine pit of the abandoned rock dump, and reasonably distribute the drilling positions and drilling depths according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: drill grouting holes on the filled mine rockfill, and grout clay slurry on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed on the bottom and slope of the mine pit. The thickness of the clay slurry layer is 5m.

[0048] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the mine pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 3.4 m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the mine pit.

[0049] (6) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 3m.

[0050] (7) Finally, fill the top clay slurry layer with 0.4 m of cultivated soil and plant vegetation on the cultivated soil.

[0051] The cultivated soil is soil for plant growth, and the plant seeds in this embodiment are vine seeds.

[0052] Comparative Example 1

[0053] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0054] (1) Preparation of clay slurry: 100 parts by weight of water, 8 parts by weight of aluminate cement, 98 parts by weight of clay, 8 parts by weight of fly ash, 15 parts by weight of phosphogypsum, 0.4 parts by weight of calcium chloride and 0.5 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0055] (2) Preparation of phosphogypsum slurry: 80 parts by weight of phosphogypsum, 6 parts by weight of iron ore tailings, 8 parts by weight of alkali slag and 8 parts by weight of aluminate cement are added to 60 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0056] (3) Fill the mine rockfill in the mine pit of the abandoned rock dump, and reasonably distribute the drilling positions and drilling depths according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: drill grouting holes on the filled mine rockfill, and grout clay slurry on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed on the bottom and slope of the mine pit. The thickness of the clay slurry layer is 2m.

[0057] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 2.5 m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the pit.

[0058] (5) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 2m.

[0059] (6) Finally, fill the top clay slurry layer with 0.5m of cultivated soil.

[0060] The cultivated soil is soil for plant growth, and the plant seeds in this comparative example are vine seeds.

[0061] Comparative Example 2

[0062] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0063] (1) Preparation of clay slurry: 100 parts by weight of water, 8 parts by weight of aluminate cement, 98 parts by weight of clay, 8 parts by weight of fly ash, 15 parts by weight of phosphogypsum, 0.4 parts by weight of calcium chloride and 0.5 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0064] (2) preparing phosphogypsum slurry: 50 parts by weight of kitchen waste, 53 parts by weight of straw and 1.5 parts of Bacillus licheniformis were mixed, and then fermented at room temperature for 2 weeks to obtain organic fertilizer; then 80 parts by weight of phosphogypsum, 6 parts by weight of iron tailings, 8 parts by weight of aluminate cement and 6 parts by weight of organic fertilizer were added to 60 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0065] (3) Fill the mine rockfill in the mine pit of the abandoned rock dump, and reasonably distribute the drilling positions and drilling depths according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: drill grouting holes on the filled mine rockfill, and grout clay slurry on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed on the bottom and slope of the mine pit. The thickness of the clay slurry layer is 2m.

[0066] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 2.5 m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the pit.

[0067] (5) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 2m.

[0068] (6) Finally, fill the top clay slurry layer with 0.5m of cultivated soil.

[0069] The cultivated soil is soil for plant growth, and the plant seeds in this comparative example are vine seeds.

[0070] Comparative Example 3

[0071] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0072] (1) Preparation of clay slurry: 100 parts by weight of water, 8 parts by weight of aluminate cement, 98 parts by weight of clay, 8 parts by weight of fly ash, 15 parts by weight of phosphogypsum, 0.4 parts by weight of calcium chloride and 0.5 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0073] (2) preparing phosphogypsum slurry: 50 parts by weight of kitchen waste, 53 parts by weight of straw and 1.5 parts of Bacillus licheniformis were mixed, and then fermented at room temperature for 2 weeks to obtain organic fertilizer; then 80 parts by weight of phosphogypsum, 8 parts by weight of alkali residue, 8 parts by weight of aluminate cement and 6 parts by weight of organic fertilizer were added to 60 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0074] (3) Fill the mine rockfill in the mine pit of the abandoned rock dump, and reasonably distribute the drilling positions and drilling depths according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: drill grouting holes on the filled mine rockfill, and grout clay slurry on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed on the bottom and slope of the mine pit. The thickness of the clay slurry layer is 2m.

[0075] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 2.5 m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the pit.

[0076] (5) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 2m.

[0077] (6) Finally, fill the top clay slurry layer with 0.5m of cultivated soil.

[0078] The cultivated soil is soil for plant growth, and the plant seeds in this comparative example are vine seeds.

[0079] Comparative Example 4

[0080] A method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization comprises the following steps:

[0081] (1) Preparation of clay slurry: 100 parts by weight of water, 8 parts by weight of aluminate cement, 98 parts by weight of clay, 8 parts by weight of fly ash, 15 parts by weight of phosphogypsum and 0.5 parts by weight of water glass were stirred and mixed to obtain clay slurry.

[0082] (2) preparing phosphogypsum slurry: 50 parts by weight of kitchen waste, 53 parts by weight of straw and 1.5 parts of Bacillus licheniformis were mixed, and then fermented at room temperature for 2 weeks to obtain organic fertilizer; then 80 parts by weight of phosphogypsum, 6 parts by weight of iron tailings, 8 parts by weight of alkali residue, 8 parts by weight of aluminate cement and 6 parts by weight of organic fertilizer were added to 60 parts by weight of water for grinding to obtain phosphogypsum slurry.

[0083] (3) Fill the mine rockfill in the mine pit of the abandoned rock dump, and reasonably distribute the drilling positions and drilling depths according to the actual area of ​​the abandoned rock dump and the grouting technical requirements: drill grouting holes on the filled mine rockfill, and grout clay slurry on the bottom and slope of the mine pit through the grouting holes. After solidification, a clay slurry layer is formed on the bottom and slope of the mine pit. The thickness of the clay slurry layer is 2m.

[0084] (4) Then, phosphogypsum slurry is grouted through grouting holes in the middle part of the pit to fill the gaps between the mine rock piles. The height of the phosphogypsum slurry filling area is the height of the filling rock mass minus 2.5 m. The clay slurry layer at the bottom and the slope isolates the phosphogypsum slurry from the inner wall of the pit.

[0085] (5) After the phosphogypsum slurry on the inner surface of the mine pit solidifies, a mixture of clay slurry and plant seeds is grouted on the top of the mine pit to form a clay slurry layer on the top. The thickness of the clay slurry layer is 2m.

[0086] (6) Finally, fill the top clay slurry layer with 0.5m of cultivated soil.

[0087] The cultivated soil is soil for plant growth, and the plant seeds in this comparative example are vine seeds.

[0088] Effect example

[0089] Taking phosphogypsum as a control, the phosphogypsum slurries prepared in Examples 1-3 and Comparative Examples 1-4, the clay slurry samples on the slopes 3 months after preparation in Examples 1-3 and Comparative Examples 1-4, and the phosphogypsum slurry samples near the clay slurry samples on the slopes were collected, and the leachates of the samples were determined according to the Horizontal Oscillation Method for Toxicity Leaching of Solid Waste (HJ557-2010), as shown in Table 1.

[0090] Table 1

[0091]

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for ecological restoration of mine rockfill based on phosphogypsum resource utilization, characterized in that: The steps include: (1) Filling the mine rockfill body in the mine pit, setting grouting holes on the filled mine rockfill body, and then grouting clay slurry on the bottom and slope of the mine pit through the grouting holes to form a clay slurry layer on the bottom and slope after solidification; (2) Grouting phosphogypsum slurry into the cavity formed by the clay slurry layer at the bottom and the slope through the grouting holes to fill the gaps between the mine rockfill bodies in the cavity; (3) After the phosphogypsum slurry on the surface of the cavity solidifies, a mixture of clay slurry and plant seeds is grouted at the top of the cavity to form a clay slurry layer at the top; (4) Finally, backfill the top clay slurry layer with cultivated soil.

2. The method for ecological restoration of mine rockfill bodies based on phosphogypsum resource utilization according to claim 1, characterized in that: The clay slurry comprises 100 parts by weight of water, 6-9 parts by weight of cement, 92-108 parts by weight of clay, 7-9 parts by weight of fly ash, 14-17 parts by weight of phosphogypsum, 0.3-0.5 parts by weight of calcium chloride and 0.4-0.6 parts by weight of water glass.

3. The method for ecological restoration of mine rockfill based on phosphogypsum resource utilization as claimed in claim 1, characterized in that: The thickness of the clay slurry layer at the bottom and the slope and the clay slurry layer at the top is 2m-5m.

4. The method for ecological restoration of mine rockfill based on phosphogypsum resource utilization as claimed in claim 1, characterized in that: The phosphogypsum slurry comprises 50-65 parts by weight of water, 65-98 parts by weight of phosphogypsum, 5-8 parts by weight of iron tailings, 5-9 parts by weight of alkali residue, 6-9 parts by weight of cement and 3-8 parts by weight of organic fertilizer; The organic fertilizer comprises the following raw materials: 30-65 parts by weight of kitchen waste, 35-70 parts by weight of straw and 1-2 parts by weight of Bacillus licheniformis strains.

5. The method for ecological restoration of mine rockfill based on phosphogypsum resource utilization as claimed in claim 4, characterized in that: The method for preparing the organic fertilizer comprises: mixing kitchen waste, straw and Bacillus licheniformis strains, and then fermenting the mixture at room temperature for 2 weeks.

6. The method for ecological restoration of mine rockfill based on phosphogypsum resource utilization as claimed in claim 4 or 5, characterized in that: The viable count of the Bacillus licheniformis strain is 7×10 9 ~7.2×10 9 CFU / g.

7. The method for ecological restoration of mine rockfill based on phosphogypsum resource utilization as claimed in claim 1, characterized in that: The grouting holes are arranged by drilling or pre-embedding.

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