CN114538872B - Mine restoration ecological concrete based on phosphate rock tailings and preparation method and application thereof - Google Patents
Mine restoration ecological concrete based on phosphate rock tailings and preparation method and application thereof Download PDFInfo
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- CN114538872B CN114538872B CN202210025326.4A CN202210025326A CN114538872B CN 114538872 B CN114538872 B CN 114538872B CN 202210025326 A CN202210025326 A CN 202210025326A CN 114538872 B CN114538872 B CN 114538872B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G20/00—Cultivation of turf, lawn or the like; Apparatus or methods therefor
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
- C04B38/0041—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter the particulate matter having preselected particle sizes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00758—Uses not provided for elsewhere in C04B2111/00 for agri-, sylvi- or piscicultural or cattle-breeding applications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a mine restoration ecological concrete based on phosphorite tailings, which comprises 0.40-0.45 part of phosphogypsum and 2.0-2.2 parts of waste rock aggregate in parts by weight, and also comprises a composite special additive, wherein the composite additive comprises modified hydroxypropyl methyl cellulose ether, a gypsum protein retarder and redispersible rubber powder; the composite additive comprises 65 to 68 weight parts of modified hydroxypropyl methyl cellulose ether, 18 to 20 weight parts of gypsum protein retarder and 14 to 16 weight parts of redispersible rubber powder; the mixing amount of the phosphogypsum-waste stone aggregate is 0.02-0.04 percent of the mass of the phosphogypsum-waste stone aggregate; the mine restoration ecological concrete fully utilizes the phosphogypsum and the waste rock in the phosphate tailings, and solves the problems of poor construction performance and low porosity after molding of the phosphogypsum and the waste rock aggregate directly applied to the ecological concrete by adding the composite additive; local materials are used, so that the phosphorite tailings are treated, and the ecological environment of a mine area is restored.
Description
Technical Field
The invention relates to ecological concrete, in particular to mine restoration ecological concrete based on phosphate rock tailings and a preparation method and application thereof.
Background
On one hand, phosphate rock is used as a main source for producing phosphate fertilizer, the development of agriculture in China is deeply influenced, more than 90 percent of the phosphate rock is used for producing the phosphate fertilizer at present, and the treatment difficulty of tailings is high. On the other hand, phosphorite is an important chemical mineral raw material and is widely applied to industries of national defense, manufacturing and the like. At present, the mining of phosphate rock mountains in China occupies more than 400 and ten thousand mu of damaged land, wherein the mining of mines occupies more than 200 and ten thousand mu of damaged land, and the historical remaining mines occupy more than 200 and ten thousand mu of damaged land, so that the repair of mines is imminent. During mining, a large amount of land which cannot be used without treatment is generated, and the land is also called mining waste land, and various pollutions caused by production exist in the waste land. The mine restoration is to restore the pollution of the mining abandoned land, so that the restoration of the damaged ecological environment and the sustainable utilization of land resources are realized. The problems in phosphorus mine restoration mainly include (1) stripping surface soil, mined rock-accumulating phosphate rock fragments and waste rock accumulation areas formed by accumulating low-grade ores; (2) The accumulation of industrial tailings which are byproducts attached to phosphorite is serious, and in addition, rainwater is abundant in south regions, and toxic and harmful components in the tailings are easy to cause secondary pollution.
The phosphorite tailings are mainly secondary tailings phosphogypsum and direct tailings waste ores. The ardealite is fast in hardening, poor in fluidity and viscosity compared with common cement and poor in construction performance when used as a cementing material. The waste ore in the phosphorite tailing is not fixed in gradation, the formed natural porosity is not high, the powder content is high under natural conditions, and the phosphorite tailing is used for preparing ecological concrete, wherein solid insoluble substances are mixed into slurry to easily cause sagging and layering phenomena, so that the problems of unstable quality, low porosity, cracking of mountain slope protection after forming and the like of the ecological concrete are caused.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a mine restoration ecological concrete based on phosphorite tailings, and the invention also aims to provide a preparation method and application of the ecological concrete.
The technical scheme is as follows: the vegetation concrete based on the phosphorite tailings comprises 0.40-0.45 part of phosphogypsum and 2.0-2.2 parts of waste rock aggregate by weight, and also comprises a special composite additive, wherein the special composite additive comprises modified hydroxypropyl methyl cellulose ether, a gypsum protein retarder and redispersible rubber powder.
Wherein, the modified hydroxypropyl methyl cellulose ether in the special admixture for composite has a dispersing function, and in addition, the modified hydroxypropyl methyl cellulose ether has a polyamino branched chain structure relative to unmodified hydroxypropyl methyl cellulose ether. Calcium ions and other small amount of metal ions form a chelate with the gypsum protein retarder to generate flocculent precipitates, the metal ions in the precipitates are further complexed with the amino branched chains of the modified hydroxypropyl methyl cellulose ether, under the condition of multi-amino branched chains, the modified hydroxypropyl methyl cellulose ether-metal ions-gypsum protein retarder forms effective comb-shaped grids to wrap the surfaces of the powdery phosphogypsum, the hydration reaction rate of the phosphogypsum is further reduced, the viscosity of slurry is increased, the later-stage framework pore system construction is facilitated, and the redundant amino branched chains are further chelated with heavy metals such as chromium and lead in the phosphogypsum and a small amount of radioactive ions to play a role in solidification. The modified hydroxypropyl cellulose ether polymer was purchased from Xuzhou Shanglong New Material science and technology Co., ltd, under the trade name of modified cellulose, model ZJ 0683. The function of the redispersible rubber powder is to reduce the acting force among macromolecules and assist the suspension and water retention.
Preferably, the composite admixture comprises 65 to 68 parts by weight of modified hydroxypropyl methyl cellulose ether, 18 to 20 parts by weight of gypsum protein retarder and 14 to 16 parts by weight of redispersible rubber powder; the mixing amount of the ardealite and the waste rock aggregate accounts for 0.02 to 0.04 percent of the total mass of the ardealite and the waste rock aggregate. The slurry segregation is serious due to too small mixing amount of the composite additive, the phosphogypsum slurry sags and cracks, the mixing amount is too large, the viscosity is too high, secondary water adding is caused in actual operation, and the quality is seriously influenced.
Preferably, the gypsum-based protein retarder is a type I collagen retarder.
Preferably, the particle size of the waste stone aggregate is 20 to 25mm. Selecting waste rocks of a mine restoration area, carrying out primary rolling to ensure that the maximum particle size is 25mm, screening aggregate with the particle size of 20-25 mm to be used as concrete aggregate, carrying out secondary rolling on the rest aggregate with the particle size of less than 20mm to ensure that the particle size of the rest aggregate is less than 5mm, mixing the aggregate with natural soil of a construction area to be used as gravel soil for planting vegetation.
The invention discloses a preparation method of mine restoration ecological concrete based on phosphate rock tailings, which comprises the following steps: after the phosphogypsum and the special composite additive are mixed with water, the waste stone aggregate is added and stirred to be uniform, and the adding amount of the water is 20-30 percent of the mass of the phosphogypsum. Excessive mixing water can cause slurry segregation, insufficient early-stage cementing power, later-stage forming cracking, and the phenomenon of slope protection landslide restoration of the mine after forming; insufficient addition of mixing water can cause the problems of uneven mixing in the early stage, uneven strength, late alkali-resistant and moisture-regaining, vegetation dysplasia, reduced later strength of ecological concrete and the like.
The invention relates to application of a phosphorite tailing-based mine restoration ecological concrete in mine restoration.
The application of the phosphate rock tailing-based mine restoration ecological concrete in mine restoration comprises the following steps:
(1) Trimming the slope surface, and removing the surface layer covering soil and part of the strongly weathered surface layer of the slope surface;
(2) Paving ecological concrete, and curing after molding until gypsum in the ecological concrete is hardened;
(3) Spreading gravel soil, sprinkling water and infiltrating; spreading the mixture of grass seeds and water-retaining agent, and sprinkling water for infiltration; continuously spreading gravel soil, and sprinkling water for infiltration;
(4) Covering film and maintaining until sprouting.
Preferably, in the step (3), the gravel soil, the grass seeds and the water-retaining agent are 0.7 to 0.9 part by weight of the gravel soil, 0.03 to 0.08 part by weight of the grass seeds and 0.0005 to 0.0008 part by weight of the water-retaining agent. Wherein the gravel soil comprises waste stone gravel with the particle size of less than 5mm and natural soil in the construction local area, and the mass ratio is 1:0.4 to 0.45; the grass seeds are coated drought-resistant grass seeds, and the coating contains soluble nutrient substances required by the early development of the grass seeds; the water-retaining agent has the functions of locking water and preventing water and soil loss.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: (1) The mine restoration ecological concrete fully utilizes the phosphogypsum and the waste rock in the phosphate tailings, and solves the problems of poor construction performance, poor quality and low porosity after molding when the phosphogypsum and the waste rock aggregate are directly used in the ecological concrete by adding the composite additive; (2) The compression resistance and the porosity of the ecological concrete meet the requirements of mine restoration by adjusting the proportion and the mixing amount of each component in the composite admixture; (3) Materials are used locally, the phosphorite tailings are treated, the ecological environment of the mine area is restored, the tailings are treated and organically combined with ecological management, the enterprise motility is fully adjusted, the cost of treating the tailings by enterprises is reduced, and the original landform of the mine is restored, so that the aim of repairing and benefiting people is fulfilled in a real sense.
Detailed Description
The technical solution of the present invention is further explained below.
Example 1
The mine restoration ecological concrete based on the phosphorite tailings comprises 0.40 part of phosphogypsum and 2.0 parts of waste rock aggregate by weight, and the mixing amount of the composite additive is 0.02 percent of the mass of the phosphogypsum and the waste rock aggregate. The composite additive comprises 65 parts by weight of modified hydroxypropyl methyl cellulose ether, 18 parts by weight of type I collagen retarder and 14 parts by weight of ethylene-vinyl acetate copolymer (redispersible rubber powder); the waste rock aggregate is derived from waste rock of a mine restoration land, the waste rock of the mine restoration land is selected, primary rolling is carried out to ensure that the maximum particle size is 25mm, the aggregate with the particle size of 20-25 mm is screened out to be used as concrete aggregate, the rest aggregate with the particle size of less than 20mm is subjected to secondary rolling to ensure that the particle size of the aggregate is less than 5mm, and the aggregate is mixed with natural soil of a construction area to be used as gravel soil for planting vegetation.
The preparation method comprises the following steps: after the phosphogypsum and the special compound additive are mixed with water, the waste stone aggregate is added and stirred to be uniform, and the adding amount of the water is 20 percent of the mass of the phosphogypsum.
The application comprises the following steps:
(1) Paving the ecological concrete in a grinding tool directly in a laboratory, curing for 27 days after forming, and hardening gypsum in the ecological concrete;
(2) Spreading gravel soil with the thickness of 10mm, and sprinkling water for infiltration; spreading mixture of coated Bermuda grass seed and ionic polyacrylamide (water-retaining agent), and sprinkling water for infiltration; continuously spreading gravel soil with the thickness of 10mm, and sprinkling water for infiltration;
(3) Covering with film, maintaining for 60 days, and germinating;
wherein, calculated by weight portion, the gravel soil is 0.7 portion, the coated bermuda grass seeds are 0.03 portion, and the ionic polyacrylamide (water-retaining agent) is 0.0005 portion; the gravel soil is prepared from waste stone gravel with the particle size of less than 5mm and construction local natural soil in a mass ratio of 1:0.4 mixing to obtain the product.
Example 2
The mine restoration ecological concrete based on the phosphorite tailings comprises 0.43 part of phosphogypsum and 2.2 parts of waste rock aggregate by weight, and the mixing amount of the composite additive is 0.03 percent of the mass of the phosphogypsum and the waste rock aggregate. Wherein the composite additive comprises 66 parts by weight of modified hydroxypropyl methyl cellulose ether, 19.4 parts by weight of type I collagen retarder and 14.6 parts by weight of ethylene-vinyl acetate copolymer (redispersible rubber powder); the waste stone aggregate is derived from waste stones in a mine restoration land, the waste stones in the mine restoration land are primarily rolled to enable the maximum particle size to be 25mm, 20-25 mm of aggregate is screened out to be used as concrete aggregate, the rest aggregate with the particle size smaller than 20mm is secondarily rolled to enable the particle size to be smaller than 5mm, and the aggregate is mixed with natural soil in a construction area to be used as gravel soil for planting vegetation.
The preparation method comprises the following steps: after the phosphogypsum and the special compound additive are mixed with water, the waste stone aggregate is added and stirred to be uniform, and the adding amount of the water is 25 percent of the mass of the phosphogypsum.
The application comprises the following steps:
(1) Paving the ecological concrete in a grinding tool directly in a laboratory, curing for 27 days after forming, and hardening gypsum in the ecological concrete;
(2) Spreading gravel soil with the thickness of 10mm, and sprinkling water for infiltration; spreading mixture of Bermuda grass seed and ionic polyacrylamide (water-retaining agent), and sprinkling water for infiltration; continuously spreading gravel soil with the thickness of 10mm, and sprinkling water for infiltration;
(3) Covering with film, maintaining for 60 days, and germinating;
wherein, calculated by weight portion, the gravel soil is 0.87 portion, the bermuda grass seed is 0.05 portion, the ionic polyacrylamide (water-retaining agent) is 0.0007 portion; the gravel soil is prepared from waste stone gravel with the particle size of less than 5mm and construction local natural soil in a mass ratio of 1:0.4 mixing to obtain the product.
Example 3
The mine restoration ecological concrete based on the phosphorite tailings comprises 0.45 part of phosphogypsum and 2.2 parts of waste rock aggregate by weight, and the mixing amount of the composite additive is 0.04 percent of the mass of the phosphogypsum and the waste rock aggregate. Wherein the composite additive comprises 68 parts by weight of modified hydroxypropyl methyl cellulose ether, 20 parts by weight of type I collagen retarder and 16 parts by weight of ethylene-vinyl acetate copolymer (redispersible rubber powder); the waste stone aggregate is derived from waste stones in a mine restoration land, the waste stones in the mine restoration land are primarily rolled to enable the maximum particle size to be 25mm, 20-25 mm of aggregate is screened out to be used as concrete aggregate, the rest aggregate with the particle size smaller than 20mm is secondarily rolled to enable the particle size to be smaller than 5mm, and the aggregate is mixed with natural soil in a construction area to be used as gravel soil for planting vegetation.
The preparation method comprises the following steps: after the phosphogypsum and the special composite additive are mixed with water, the waste stone aggregate is added and stirred to be uniform, and the adding amount of the water is 30 percent of the mass of the phosphogypsum.
The application comprises the following steps:
(1) Paving the ecological concrete in a grinding tool directly in a laboratory, curing for 27 days after forming, and hardening gypsum in the ecological concrete;
(2) Spreading gravel soil with the thickness of 10mm, and sprinkling water for infiltration; spreading mixture of Bermuda grass seed and ionic polyacrylamide (water-retaining agent), and sprinkling water for infiltration; continuously spreading gravel soil with the thickness of 10mm, and sprinkling water for infiltration;
(3) Covering with film, maintaining for 60 days, and germinating;
wherein, calculated by weight portion, the gravel soil is 0.9 portion, the bermuda grass seed is 0.08 portion, the ionic polyacrylamide (water-retaining agent) is 0.0008 portion; the gravel soil is prepared from waste stone gravel with the particle size of less than 5mm and natural soil in the construction local area by mass ratio of 1: 0.45 and mixing to obtain the product.
Comparative example 1
On the basis of the example 2, the compound admixture is not added, and other conditions are not changed.
Comparative example 2
On the basis of the example 2, the adding amount of the composite additive is adjusted to be 0.01 percent of the mass of the phosphogypsum and the waste rock aggregate.
Comparative example 3
On the basis of the example 2, the adding amount of the composite additive is adjusted to be 0.06 percent of the mass of the phosphogypsum and the waste rock aggregate.
Performance testing
(1) The ecological concrete of examples 1 to 3 and comparative examples 1 to 3 were tested for their compressive capacity and porosity. The unconfined compressive strength is adopted to test the compressive capacity of the ecological concrete, and an instrument uniaxial press is tested. The method for testing the porosity of the ecological concrete by adopting a drainage method is used, and the volume V of the original water body is known Water (W) And volume V of the sample after complete immersion in water General assembly And the difference value of the volume of the framework concrete and the volume of the non-communicated holes is divided by the volume of the test piece die 15 x 15, and the porosity is measured.
The test results are shown in Table 1.
TABLE 1 ecological concrete Performance test results
(2) The planting test is an internode environment test (simulating a mine restoration engineering environment in a laboratory), the planting test is carried out in the mine restoration ecological concrete to obtain the budding time, the relative value is the ratio of the test result to the grass forming height and the root depth measured by planting in common soil, the pH value and the conductivity CT value of the ecological concrete leaching water body are tested, and the test result is shown in table 2.
TABLE 2 mine restoration ecological concrete plant growth performance test
As can be seen from table 1, the ecological concrete compressive capacity of embodiments 1 to 3 satisfies the geological disaster problem caused by the disintegration and weathering of the mine surface, the mine excavation surface can be stabilized, the porosity increases the soil and development space required for the later vegetation development, and the communicated pores enable the later plant root system to spread to the lower side of the ecological concrete, so that the mine restoration slope protection and the excavation surface form integral stress, and the slope protection reliability is increased. Example 1 performed best, with both compressive capacity and pore forming properties being optimal. Comparative example 1 has no composite admixture added, comparative example 2 has a small amount of the composite admixture added, both show severe segregation, the slurry is difficult to effectively suspend gelled substances, and the compression resistance and the porosity after final molding are poor and cannot be applied. And in the comparative example 3, due to the excessively high mixing amount, the slurry has excessively high viscosity, is difficult to mix and has poor construction applicability.
As can be seen from Table 2, the seed germination time, germination rate, relative grass formation height, and root depth of the seed of Geranium sibiricum of examples 1-3 are all better; through the pH value and the conductivity CT value of the water body measured by a leaching test, the pH value of the water body in the examples 1-3 is suitable for the growth and development of grass seeds, and the low conductivity of the concentration of the reactive ions means that most of the polluted ions in the phosphorite tailings are solidified, thereby meeting the aim of repairing a vegetation layer in mine repair; the best results are obtained in example 1. The germchit germination time of the cibotium barometz seeds in the comparative examples 1 and 2 is long, the germination rate is extremely low, the relative grass forming height and the root system depth are extremely low, and the planting effect is poor; the leached water is alkaline, and the high conductivity indicates that the polluted ions in the phosphate tailings are not solidified, so that the ecological restoration effect is not achieved. Comparative example 3 ecological concrete could not be molded and plant growth test could not be performed.
Claims (8)
1. The mine restoration ecological concrete based on the phosphorite tailings is characterized by comprising 0.40 to 0.45 part by weight of phosphogypsum and 2.0 to 2.2 parts by weight of waste rock aggregate and further comprising a special composite additive, wherein the special composite additive comprises 65 to 68 parts by weight of modified hydroxypropyl methyl cellulose ether, 18 to 20 parts by weight of gypsum protein retarder and 14 to 16 parts by weight of redispersible rubber powder; the mixing amount of the ardealite-waste rock aggregate is 0.02-0.04% of the total mass of the ardealite and the waste rock aggregate; wherein the modified hydroxypropyl methyl cellulose ether has a polyamino branched structure; the gypsum type protein retarder is a type I collagen retarder.
2. The phosphate rock tailing based mine restoration ecological concrete according to claim 1, wherein the particle size of the waste rock aggregate is 20 to 25mm.
3. The preparation method of the phosphate rock tailing-based mine restoration ecological concrete as claimed in claim 1 or 2, characterized in that after the phosphogypsum and the special composite additive are mixed with water, the waste rock aggregate is added and stirred uniformly, and the addition amount of the water is 20-30% of the mass of the phosphogypsum.
4. The application of the phosphate rock tailing-based mine restoration ecological concrete disclosed by claim 1 or 2 in mine restoration.
5. The application of the phosphorite tailing-based mine restoration ecological concrete in mine restoration is characterized by comprising the following steps:
(1) Trimming the slope surface, and removing the covering soil on the surface layer of the slope surface and part of the strongly weathered surface layer;
(2) Paving ecological concrete, curing after molding until gypsum in the ecological concrete is hardened;
(3) Spreading gravel soil, sprinkling water and infiltrating; spreading the mixture of grass seeds and water-retaining agent, and sprinkling water for infiltration; continuously spreading the gravel soil, and sprinkling water to seep downwards;
(4) Covering with film and maintaining until sprouting.
6. The application of the phosphorite tailing-based mine restoration ecological concrete in mine restoration, as recited in claim 5, is characterized in that in step (3), the gravel soil, the grass seeds and the water-retaining agent are in parts by weight, 0.7 to 0.9 part of the gravel soil, 0.03 to 0.08 part of the grass seeds and 0.0005 to 0.0008 part of the water-retaining agent.
7. The application of the phosphorite tailing-based mine restoration ecological concrete in mine restoration, which is characterized in that in the step (3), the gravel soil is prepared from waste rock gravel with the particle size of less than 5mm and natural soil in a construction site in a mass ratio of 1:0.4 to 0.45 percent.
8. The application of the phosphorite tailing-based mine restoration ecological concrete in mine restoration, which is characterized in that in the step (3), the grass seeds are coated drought-enduring grass seeds, and soluble nutrient substances required by early development of the grass seeds are contained in the coating.
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| WO2017179048A1 (en) * | 2016-04-14 | 2017-10-19 | Dejorno Shlomi | Composite material comprising phosphogypsum |
| CN107140890A (en) * | 2017-06-12 | 2017-09-08 | 刘忠元 | A kind of concrete for plant growth and its construction method |
| CN110521503B (en) * | 2019-08-07 | 2021-09-17 | 叶建军 | Wet-spraying vegetation concrete ecological slope protection technology |
| CN111018418B (en) * | 2019-12-17 | 2021-10-08 | 湖北尧治河化工股份有限公司 | Method for recycling waste phosphorite on site |
| CN111825406A (en) * | 2020-07-29 | 2020-10-27 | 瓮福化工科技有限公司 | Phosphogypsum-based self-leveling mortar |
| CN112250359A (en) * | 2020-10-21 | 2021-01-22 | 宜昌乐德兴商品砼有限责任公司 | Vegetation concrete prepared from phosphate tailings and phosphate slag and method |
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Application publication date: 20220527 Assignee: Suining Zhenning New Building Materials Research Institute Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2022980025820 Denomination of invention: A kind of ecological concrete for mine restoration based on phosphate tailings and its preparation method and application Granted publication date: 20221125 License type: Common License Record date: 20221212 |
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