CN110961443A - Economical barrier particles for in-situ greening restoration of red mud disposal site and restoration method - Google Patents
Economical barrier particles for in-situ greening restoration of red mud disposal site and restoration method Download PDFInfo
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- CN110961443A CN110961443A CN201911164494.6A CN201911164494A CN110961443A CN 110961443 A CN110961443 A CN 110961443A CN 201911164494 A CN201911164494 A CN 201911164494A CN 110961443 A CN110961443 A CN 110961443A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/10—Cements, e.g. Portland cement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention discloses barrier particles for in-situ greening restoration of an economical red mud disposal site and a restoration method, wherein the restoration particles comprise the following components in parts by weight: 60-80 parts of red mud soil, 2-4 parts of cement, 10-20 parts of desulfurized gypsum and 5-10 parts of fly ash, and the repairing method comprises the following steps: preparing barrier particles, paving the barrier particles on the surface of a red mud storage yard to form a barrier layer, paving a geotechnical film to form an isolation layer on the surface of the barrier layer, paving a matrix improvement layer on the surface of the isolation layer, and planting plants on the matrix improvement layer to form a vegetation layer. By adopting the in-situ greening restoration method for the red mud disposal site, an effective spacing layer is established on the surface of the red mud disposal site, so that the problem of alkali return and salt return of the red mud disposal site is fundamentally solved, the survival rate and the growth effect of the restored vegetation are ensured, and the problems of ecological restoration and greening of the red mud disposal site are further solved economically and effectively.
Description
Technical Field
The invention relates to the technical field of red mud yard in-situ greening restoration, in particular to barrier particles for economical red mud yard in-situ greening restoration and a restoration method.
Background
The treatment of red mud always troubles the academic world, the government world and the oxidationA worldwide problem for aluminum production enterprises. According to statistics, the global alumina production enterprises can only bury or pile up the vast majority of red mud tailings with the byproduct of more than one ton of red mud tailings when producing one ton of alumina, and the method poses important threats to soil, water resources and ecological environment. The red mud is red powder mud waste discharged by the alumina industry, belongs to strong alkaline harmful residue, has high water content and volume weight of 700-1000 kg/m3The specific surface area is 0.5 to 0.8m2(ii) in terms of/g. At present, red mud is stockpiled by adopting a damming wet method at home and abroad, and a red mud yard expands and expands again along with the increase of the yield of alumina, so that a large number of exposed areas are formed, the ecological environment is destroyed, and local microclimate change and the damage of a biological chain can be caused. In addition, the accumulation method is easy to cause a large amount of waste alkali liquor to permeate into nearby farmlands, so that soil salinization and swampiness are caused, and soil and underground water sources are polluted. The pH value of the surface layer of the red mud yard is between 10 and 12, the pH value generally suitable for plant growth is between 5.5 and 7.5, and most plants have pH value>Growth was difficult in case of 9.0; in addition, deep-layer salt in the red mud storage yard can move up to the surface along with the capillary action, mainly because the deep-layer soluble salt in the storage yard transfers to the surface layer along with evaporated water when the temperature of the storage yard is high, the phenomenon of returning alkali and salt is serious, and the vegetation growth is more difficult to realize. Therefore, greening the red mud storage yard becomes a worldwide environmental protection problem.
At present, the restoration of the red mud yard is mainly embodied in the character improvement of the red mud, the earth covering greening construction and the like, but the problems of alkali return, salt return and vegetation growth of the red mud yard cannot be fundamentally solved, the manufacturing cost is too high, and enterprises cannot bear huge expenses at present for the large-area red mud yard.
Disclosure of Invention
In view of the above, the invention aims to provide an economical barrier particle for in-situ greening restoration of a red mud disposal site and a restoration method thereof, so as to establish an effective spacer layer on the surface of the red mud disposal site, thereby fundamentally solving the problem of alkali return and salt return of the red mud disposal site, ensuring the survival rate and growth effect of the restored vegetation, and further economically and effectively solving the problems of ecological restoration and greening of the red mud disposal site.
The invention solves the problems through the following technical means:
the economical barrier particle for in-situ greening restoration of the red mud disposal site comprises the following components in parts by weight: 60-80 parts of red mud soil, 2-4 parts of cement, 10-20 parts of desulfurized gypsum and 5-10 parts of fly ash.
Further, the particles are spherical, pyramidal, cubic, or other irregular shapes.
A method for carrying out in-situ greening restoration on a red mud disposal site by adopting the blocking particles comprises the following steps:
s1: preparation of barrier particles: mixing the red mud soil, the cement, the desulfurized gypsum and the fly ash according to a proportion, spraying water, uniformly stirring, placing the mixture in curing equipment for curing, and then granulating the cured mixture by utilizing a granulator;
s2: laying blocking particles on the surface of the red mud storage yard to form a blocking layer;
s3: laying a geomembrane on the surface of the barrier layer to form an isolation layer;
s4: laying a substrate improvement layer on the surface of the isolation layer;
s5: and planting plants on the substrate improvement layer to form a vegetation layer.
Further, the barrier layer is formed by stacking 3-5 layers of barrier particles.
Furthermore, the pore space of the geomembrane adopted by the isolating layer is 0.1-0.3 mm.
Further, the thickness of the isolation layer is 2.5-4 mm.
Further, the components of the matrix improvement layer comprise vinasse, organic fertilizer, phosphogypsum, red mud and reset microbial fertilizer, and the specific preparation process comprises the following steps: mixing the treated vinasse, organic fertilizer, phosphogypsum and the excavated red mud according to the weight ratio of vinasse: organic fertilizer: phosphogypsum: red mud 3: 1: 1: 5 to form an improved matrix after being uniformly mixed, and 3 to 5ml of compound microbial fertilizer is added into each 1 cubic meter of the improved matrix.
Furthermore, the plants planted in the vegetation layer are plants with shallow root systems, alkali resistance and drought resistance.
The invention has the beneficial effects that:
the barrier particles for in-situ greening restoration of the economical red mud disposal site and the restoration method comprise the following components in parts by weight: 60-80 parts of red mud soil, 2-4 parts of cement, 10-20 parts of desulfurized gypsum and 5-10 parts of fly ash, and the repairing method comprises the following steps: preparing barrier particles, paving the barrier particles on the surface of a red mud storage yard to form a barrier layer, paving a geotechnical film to form an isolation layer on the surface of the barrier layer, paving a matrix improvement layer on the surface of the isolation layer, and planting plants on the matrix improvement layer to form a vegetation layer. By adopting the in-situ greening restoration method for the red mud disposal site, an effective spacing layer is established on the surface of the red mud disposal site, so that the problem of alkali return and salt return of the red mud disposal site is fundamentally solved, the survival rate and the growth effect of the restored vegetation are ensured, and the problems of ecological restoration and greening of the red mud disposal site are further solved economically and effectively.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic view of a layered system obtained by the complex green repair method of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Example 1
The economical barrier particle for in-situ greening restoration of the red mud disposal site comprises the following components in parts by weight: 60 parts of red mud soil, 2 parts of cement, 10 parts of desulfurized gypsum and 5 parts of fly ash. The particles are spherical, pyramidal, cubic or other irregular shapes. The red mud soil is the red mud soil dug in situ.
A method for carrying out in-situ greening restoration on a red mud disposal site by adopting the blocking particles comprises the following steps:
s1: preparation of barrier particles: mixing the red mud soil, the cement, the desulfurized gypsum and the fly ash according to a proportion, spraying water, uniformly stirring, placing the mixture in curing equipment for curing, and then granulating the cured mixture by utilizing a granulator;
s2: laying 3 layers of barrier particles on the surface of the red mud storage yard to form a barrier layer;
s3: laying a geomembrane on the surface of the barrier layer to form an isolation layer; the pore size of the geomembrane is 0.1 mm; the thickness of the isolation layer is 2.5 mm;
s4: laying a substrate improvement layer on the surface of the isolation layer; the components of the matrix improvement layer comprise vinasse, organic fertilizer, phosphogypsum, red mud and reset microbial fertilizer, and the specific preparation process comprises the following steps: mixing the treated vinasse, organic fertilizer, phosphogypsum and the excavated red mud according to the weight ratio of vinasse: organic fertilizer: phosphogypsum: red mud 3: 1: 1: 5, forming an improved matrix after uniformly mixing, and adding 3ml of compound microbial fertilizer into each 1 cubic volume of the improved matrix;
s5: planting plants on the substrate improvement layer to form a vegetation layer; the plants planted in the vegetation layer are plants with shallow root systems and alkali resistance and drought resistance.
The layered system obtained by the above-mentioned greening repair method is schematically shown in fig. 1, and comprises a vegetation layer 1, a matrix modification layer 2, an isolation layer 3 and a barrier layer 4.
Example 2
The economical barrier particle for in-situ greening restoration of the red mud disposal site comprises the following components in parts by weight: 70 parts of red mud soil, 3 parts of cement, 15 parts of desulfurized gypsum and 8 parts of fly ash. The particles are spherical, pyramidal, cubic or other irregular shapes. The red mud soil is the red mud soil dug in situ.
A method for carrying out in-situ greening restoration on a red mud disposal site by adopting the blocking particles comprises the following steps:
s1: preparation of barrier particles: mixing the red mud soil, the cement, the desulfurized gypsum and the fly ash according to a proportion, spraying water, uniformly stirring, placing the mixture in curing equipment for curing, and then granulating the cured mixture by utilizing a granulator;
s2: laying 4 layers of barrier particles on the surface of the red mud storage yard to form a barrier layer;
s3: laying a geomembrane on the surface of the barrier layer to form an isolation layer; the pore size of the geomembrane is 0.2 mm; the thickness of the isolation layer is 3 mm;
s4: laying a substrate improvement layer on the surface of the isolation layer; the components of the matrix improvement layer comprise vinasse, organic fertilizer, phosphogypsum, red mud and reset microbial fertilizer, and the specific preparation process comprises the following steps: mixing the treated vinasse, organic fertilizer, phosphogypsum and the excavated red mud according to the weight ratio of vinasse: organic fertilizer: phosphogypsum: red mud 3: 1: 1: 5, forming an improved matrix after uniformly mixing the components in a volume ratio, and adding 4ml of compound microbial fertilizer into each 1 cubic volume of the improved matrix;
s5: planting plants on the substrate improvement layer to form a vegetation layer; the plants planted in the vegetation layer are plants with shallow root systems and alkali resistance and drought resistance.
The layered system obtained by the above-mentioned greening repair method is schematically shown in fig. 1, and comprises a vegetation layer 1, a matrix modification layer 2, an isolation layer 3 and a barrier layer 4.
Example 3
The economical barrier particle for in-situ greening restoration of the red mud disposal site comprises the following components in parts by weight: 80 parts of red mud soil, 4 parts of cement, 20 parts of desulfurized gypsum and 10 parts of fly ash. The particles are spherical, pyramidal, cubic or other irregular shapes. The red mud soil is the red mud soil dug in situ.
A method for carrying out in-situ greening restoration on a red mud disposal site by adopting the blocking particles comprises the following steps:
s1: preparation of barrier particles: mixing the red mud soil, the cement, the desulfurized gypsum and the fly ash according to a proportion, spraying water, uniformly stirring, placing the mixture in curing equipment for curing, and then granulating the cured mixture by utilizing a granulator;
s2: paving 5 layers of barrier particles on the surface of the red mud storage yard to form a barrier layer;
s3: laying a geomembrane on the surface of the barrier layer to form an isolation layer; the pore size of the geomembrane is 0.3 mm; the thickness of the isolation layer is 4 mm;
s4: laying a substrate improvement layer on the surface of the isolation layer; the components of the matrix improvement layer comprise vinasse, organic fertilizer, phosphogypsum, red mud and reset microbial fertilizer, and the specific preparation process comprises the following steps: mixing the treated vinasse, organic fertilizer, phosphogypsum and the excavated red mud according to the weight ratio of vinasse: organic fertilizer: phosphogypsum: red mud 3: 1: 1: 5, forming an improved matrix after uniformly mixing, and adding 3-5ml of compound microbial fertilizer into each 1 cubic volume of the improved matrix;
s5: planting plants on the substrate improvement layer to form a vegetation layer; the plants planted in the vegetation layer are plants with shallow root systems and alkali resistance and drought resistance.
The layered system obtained by the above-mentioned greening repair method is schematically shown in fig. 1, and comprises a vegetation layer 1, a matrix modification layer 2, an isolation layer 3 and a barrier layer 4.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. The economical barrier particle for in-situ greening restoration of the red mud disposal site is characterized by comprising the following components in parts by weight: 60-80 parts of red mud soil, 2-4 parts of cement, 10-20 parts of desulfurized gypsum and 5-10 parts of fly ash.
2. The economical red mud yard in-situ revival repair barrier particle of claim 1, wherein said particle is spherical, pyramidal, cubic or other irregular.
3. A method for in-situ greening restoration of a red mud disposal site by using the barrier particles as defined in claim 1, comprising the steps of:
s1: preparation of barrier particles: mixing the red mud soil, the cement, the desulfurized gypsum and the fly ash according to a proportion, spraying water, uniformly stirring, placing the mixture in curing equipment for curing, and then granulating the cured mixture by utilizing a granulator;
s2: laying blocking particles on the surface of the red mud storage yard to form a blocking layer;
s3: laying a geomembrane on the surface of the barrier layer to form an isolation layer;
s4: laying a substrate improvement layer on the surface of the isolation layer;
s5: and planting plants on the substrate improvement layer to form a vegetation layer.
4. The method for in-situ greening restoration of a red mud disposal site according to claim 3, wherein the barrier layer is formed by stacking 3-5 layers of barrier particles.
5. The method for in-situ greening restoration of a red mud disposal site according to claim 3, wherein the geomembrane used for the isolation layer has a pore size of 0.1-0.3 mm.
6. The method for in-situ greening restoration of a red mud disposal site according to claim 3, wherein the thickness of the isolation layer is 2.5-4 mm.
7. The method for in-situ greening restoration of the red mud disposal site according to claim 3, wherein the components of the matrix improvement layer comprise vinasse, organic fertilizer, phosphogypsum, red mud and resetting microbial fertilizer, and the specific preparation process comprises the following steps: mixing the treated vinasse, organic fertilizer, phosphogypsum and the excavated red mud according to the weight ratio of vinasse: organic fertilizer: phosphogypsum: red mud 3: 1: 1: 5 to form an improved matrix after being uniformly mixed, and 3 to 5ml of compound microbial fertilizer is added into each 1 cubic meter of the improved matrix.
8. The method for in-situ greening restoration of a red mud disposal site according to claim 3, wherein the plants planted in the vegetation layer are plants with shallow root systems, alkali resistance and drought resistance.
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Cited By (5)
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| CN111842464A (en) * | 2020-06-30 | 2020-10-30 | 河南省地质环境规划设计院有限公司 | Method for reconstructing vegetation in alumina red mud storage yard |
| CN112500226A (en) * | 2020-12-16 | 2021-03-16 | 中国有色金属长沙勘察设计研究院有限公司 | Composition for red mud modification and preparation method of composition |
| CN112616615A (en) * | 2020-12-16 | 2021-04-09 | 中国有色金属长沙勘察设计研究院有限公司 | Red mud modification method |
| CN112655515A (en) * | 2020-12-16 | 2021-04-16 | 中铝环保生态技术(湖南)有限公司 | Method for converting red mud into soil |
| CN114015455A (en) * | 2021-11-23 | 2022-02-08 | 中国有色金属长沙勘察设计研究院有限公司 | Improvement agent for red mud in-situ soil and application method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111842464A (en) * | 2020-06-30 | 2020-10-30 | 河南省地质环境规划设计院有限公司 | Method for reconstructing vegetation in alumina red mud storage yard |
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| CN112655515A (en) * | 2020-12-16 | 2021-04-16 | 中铝环保生态技术(湖南)有限公司 | Method for converting red mud into soil |
| CN114015455A (en) * | 2021-11-23 | 2022-02-08 | 中国有色金属长沙勘察设计研究院有限公司 | Improvement agent for red mud in-situ soil and application method thereof |
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