CN111662723B - Acidic improved matrix for metal ore waste rock yard and vegetation recovery construction method thereof - Google Patents

Acidic improved matrix for metal ore waste rock yard and vegetation recovery construction method thereof Download PDF

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CN111662723B
CN111662723B CN202010314154.3A CN202010314154A CN111662723B CN 111662723 B CN111662723 B CN 111662723B CN 202010314154 A CN202010314154 A CN 202010314154A CN 111662723 B CN111662723 B CN 111662723B
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waste rock
metal ore
vegetation
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CN111662723A (en
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王琼
杨越晴
孙伟
李�昊
孟磊
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BGRIMM Technology Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • 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
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
    • 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
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
    • A01G24/17—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing slag
    • 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
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
    • A01G24/22—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing plant material
    • A01G24/25—Dry fruit hulls or husks, e.g. chaff or coir
    • 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
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2101/00—Agricultural use

Abstract

The invention discloses an acidic modified substrate of a metal ore waste rock yard and a vegetation recovery construction method thereof, wherein the acidic modified substrate comprises HDS (high density polyethylene) bottom mud, lime powder, rice hulls and an organic polymerization crosslinking agent, and the thickness of the acidic modified substrate corresponds to 1-3m3The addition amount of the HDS bottom mud, the lime powder, the rice hull and the organic polymerization crosslinking agent is 20-40kg, 5-10kg and 50-100 g; the vegetation recovery construction method comprises the steps of uniformly mixing an acidic modified substrate and water to prepare a thick slurry acidic modified material, spraying the thick slurry acidic modified material on the surface of a pretreated waste rock yard, and solidifying to form an acidic modified layer. The HDS bottom mud, the lime powder and the rice hulls are chelated mutually under the action of the organic polymerization crosslinking agent to form an organic whole, countless continuous improved columns can be formed in gaps among waste rocks, and leaching loss of the lime powder is reduced to the maximum extent; the vegetation recovery construction method adopts hydraulic spray seeding, utilizes the gravity of fluid to carry out layered permeation to form an acidic improved layer, and has the advantages of safe construction, high efficiency and good effect.

Description

Acidic improved matrix for metal ore waste rock yard and vegetation recovery construction method thereof
Technical Field
The invention belongs to the technical field of vegetation restoration, relates to vegetation restoration of a metal ore waste rock yard, and particularly relates to an acidic improved matrix of the metal ore waste rock yard and a vegetation restoration construction method thereof.
Background
The proportion of sulfide existing in minerals of metal mines is large, and particularly metal deposits of copper, lead, zinc and the like account for about 75% of the total amount of various mineral types. The metal grade is extremely low, the mineral stripping ratio is large, and a large amount of solid waste is generated; wherein, about 1.25 tons of waste rocks are generated on average per 1 ton of ore mined from the mountain, about 1.3-1.4 hundred million tons/a of waste rocks are discharged in recent years, and billions of tons of waste rocks are accumulated and stockpiled.
Stacking the waste rocks in the open air, oxidizing sulfur and metal sulfides in the waste rocks under the catalytic action of microorganisms such as thiobacillus ferrooxidans and thiobacillus thiooxidans, and washing the waste rocks by rainwater to form Acid Mine Draina (AMD); because the pH value of AMD is extremely low, and the AMD contains metal ions such As Fe, Mn, Cu, Zn, Pb, Cd, As, Al and the like and SO42-And the environment is polluted and damaged.
Engineering practice proves that vegetation recovery of the waste rock yard firstly controls the generation of acid pollution from a source and can recover damaged ecological environment; in the process of vegetation recovery in the waste rock yard, the acid production environment of the yard seriously restricts the normal growth of plants, and finally the failure of the vegetation recovery engineering is caused. In conclusion, the analysis shows that how to effectively construct the acidic modified layer is important for the vegetation recovery of the waste rock farm.
How to reduce and control the further acidification of the acid soil is the key of acid improvement of the waste rock yard, and the basic principle is to reduce and control the acidification by adding soil conditioners so as to create an environment for normal growth of plants. The conventional method at present adopts a mode of manually spreading a modifying agent such as lime powder to improve acidity, and the defects are that the safety of operating workers and the timeliness of an improved project cannot be well guaranteed.
Disclosure of Invention
Aiming at the defects, the invention provides an acidic modified matrix of a metal mine waste rock yard and a vegetation recovery construction method thereof, aiming at the current situations of large production amount of HDS bottom mud, low resource utilization rate, large land occupation of stockpiling and environmental risk in the prior art.
The invention adopts the following technical scheme:
the invention provides an acidic modified matrix for a metal ore waste rock yard, which comprises HDS bottom mud, lime powder, rice hulls and an organic polymerization crosslinking agent.
Specifically, in the above acidic modified substrate, it corresponds to 1 to 3m3The addition amount of the lime powder, the rice hull and the organic polymerization crosslinking agent is respectively 20-40kg and 5kg10kg and 50-100 g.
In the technical scheme, the HDS bottom mud is waste obtained by recovering valuable elements from mine acid wastewater and performing acid-base neutralization treatment on lime milk or carbide slag, the water content of the waste is less than or equal to 40%, and the pH value of the waste is 6-7.5.
In detail, the HDS bottom sludge is a type I general industrial solid waste that is a local source.
Further, in the above technical scheme, the rice hulls are waste after rice processing.
In detail, the rice hulls are rich in cellulose, lignin and silicon dioxide, and the higher the silicon dioxide content in the rice hulls is, the harder the rice hulls are, the stronger the wear resistance is, and the rice hulls are solid waste resources capable of being recycled. The rice hulls and the HDS bottom mud are mixed, so that the storage property and the buffering property of the HDS bottom mud can be improved, meanwhile, the use of the rice hulls can protect the rural ecological environment and promote the ecological development of agriculture; other ground crop products having the above-described functions may be used, and the effects are superior to those in the present application.
Further, in the above technical scheme, the organic polymer cross-linking agent is a natural adhesive prepared by compounding, blending and modifying plant seeds as rubber powder.
Aiming at the defect that the traditional high-molecular compound adhesive is not easy to degrade, the organic polymerization crosslinking agent greatly improves the attachment strength of soil particles by establishing binding crosslinking between fibers and soil, promotes the formation of a soil particle agglomerate structure, can optimize the living environment of soil microorganisms and further promotes the curing of the soil; other organic polymeric crosslinking agents having the above-mentioned functions may also be used, and the effects are preferred as used herein.
The invention also provides a vegetation recovery construction method of the metal ore waste rock yard, which comprises the steps of pretreating the metal ore waste rock yard, uniformly mixing the acid modified substrate and water to prepare a thick slurry acid modified material, spraying the acid modified material to the surface of the metal ore waste rock yard to be recovered, and solidifying to form an acid modified layer.
In particular toIn the technical scheme, the dosage of the acidic modified matrix is determined according to the unit area of the metal ore waste rock yard to be recovered; in detail, the HDS bottom mud, the lime powder, the rice hull and the organic polymeric crosslinking agent are respectively used in an amount of 0.1-0.3m per square meter of the metal ore waste rock field to be restored32-4kg, 0.5-1.0kg and 5-10 g.
Specifically, in the above technical scheme, the acidic modified matrix and water are added into a stirring tank of a hydraulic spray seeder, the acidic modified matrix and water are fully mixed through a stirring shaft in the stirring tank to form a thick slurry acidic modified material, the thick slurry acidic modified material is sprayed onto the surface of the metal ore waste rock field to be restored through the hydraulic spray seeder, the thick slurry acidic modified material is infiltrated through the gravity action and the fluid mechanics principle, and a surface layer and a vertical acidic modified layer are formed after consolidation.
Further, in the above technical solution, the solid-to-liquid ratio of the acidic modification material is (3-5): 10.
still further, in the above technical scheme, the slope of the pretreated metal ore waste rock yard is not more than 50 °.
Specifically, in the technical scheme, the flatness of the side slope of the metal ore waste rock site to be recovered is maximized by preprocessing the metal ore waste rock site, the slope is controlled within 50 degrees, and the infiltration depth of the acidic improved layer is guaranteed.
Further, in the above technical solution, in the spraying process, the acidic modified material is controlled to completely permeate into the barren rock gaps of the metal ore barren rock yard, so as to avoid the formed fluid flowing on the surface of the metal ore barren rock yard.
In one embodiment of the present invention, the acid-modified material is sprayed onto the surface of the metal ore dumps to be rehabilitated using multiple sprays.
Preferably, in the above technical solution, the interval between adjacent spraying is to control the last spraying of the acidic modified material to complete the consolidation.
In detail, in the technical scheme, the acid improvement is implemented by adopting a hydraulic spray seeder injection mode, on one hand, the key problems of poor construction operation safety and easy leaching of lime powder after rainwater leaching caused by unorganized dust caused by the traditional direct lime powder broadcast improvement can be effectively solved, on the other hand, the acid improvement is thick slurry material with the solid-to-liquid ratio of 30-50%, the loss of the thick slurry material along the side slope can be avoided by adopting multiple injection, in addition, the thick slurry material is subjected to layered permeation under the action of the gravity of a fluid through multiple injection, and the HDS bottom mud, the lime powder and the rice hulls are formed into an organic whole through an organic polymerization adhesive in the vertical direction, so that the long-acting property of the acid improvement is kept. Therefore, the sustainable soil environment for later vegetation recovery can be created, the normal growth of vegetation is promoted, and the recovery of an ecological system is accelerated.
Further, in the above technical solution, the thickness of the acid-modified layer in the direction perpendicular to the surface of the metal ore dumps is 1.0 to 1.5 m.
Still further, in the above technical solution, the pretreatment of the metal ore waste rock yard specifically includes:
s1, respectively carrying out terrain arrangement on a top platform, a side slope and a side slope platform of the metal ore waste rock yard in blocks, ensuring the integral stability of the side slope platform and the top platform, and enabling the side slope platform and the top platform to form an inclination angle inwards and outwards respectively;
s2, constructing criss-cross drainage ditches in the metal ore waste rock yard, constructing a good rainwater diversion system, and maximally reducing rainwater leaching.
Specifically, in the technical scheme, the metal ore waste rock yard is subjected to terrain arrangement in a mechanical auxiliary manual mode, so that instability of a slope body caused by rainwater erosion is avoided.
Still further, in the above aspect, the vegetation recovery construction method may further include covering soil and sowing plant seeds after the acidic improving material is solidified to form an acidic improving layer.
Specifically, in the above technical scheme, besides the selection of the plant seeds to be sown to suit the local climate, special attention should be paid to the selection of stress-resistant and cold-resistant varieties.
The invention has the advantages that:
(1) the acidic modified matrix of the metal ore waste rock yard is prepared by mixing HDS bottom mud, lime powder, rice hulls and an organic polymerization crosslinking agent serving as raw materials, under the action of the organic polymerization crosslinking agent, the HDS bottom mud, the lime powder and the rice hulls are chelated with one another to form an organic whole, countless continuous modified columns are formed in waste rock gaps of the metal ore waste rock yard, leaching loss of the lime powder is reduced to the maximum extent, long-term effect of acidic modification of the metal ore waste rock yard is guaranteed, and the problem that leaching loss of traditional acidic modified lime powder is fast is effectively solved;
(2) the acidic improved matrix of the metal ore waste rock yard provided by the invention takes HDS bottom mud as a main raw material, so that the resource utilization of mine solid waste is realized, the waste can be changed into valuable, and the condition that a large amount of land is occupied by the HDS bottom mud yard and the surrounding environment is influenced is avoided;
(3) the vegetation recovery construction method of the metal ore waste rock yard provided by the invention aims at the irregularity of the particle size of the waste rock of the metal ore waste rock yard to be recovered, and forms an acid improved layer with a surface layer and a vertical three-dimensional structure by means of hydraulic spray seeding, preferably by adopting multiple times of spraying and layered permeation under the action of the gravity of fluid;
(4) the vegetation recovery construction method for the metal ore waste rock yard adopts hydraulic spray-seeding equipment with better mechanization degree, avoids the problems of a large amount of dust and the occupational health of operation workers caused by dry spraying or lime powder scattering adopted in the prior art, and has high production efficiency and great environmental and social benefits;
(5) the vegetation recovery construction method for the metal ore waste rock yard has the advantages of simple construction process, easy implementation, high efficiency and good effect, is suitable for large-area application, and has obvious effect and long-term significance for optimizing ecological environment.
Drawings
FIG. 1 is a schematic cross-sectional view of an acidic modified layer formed in vegetation restoration construction of a metal ore waste yard by an acidic modified substrate prepared using HDS substrate sludge as a main raw material according to an embodiment of the present invention;
in the figure:
1-top platform, 2-side slope, 3-side slope platform, 4-drainage ditch, 5-acidic modified material and 6-waste rock; 7-an acid modified layer.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The following examples are intended to illustrate the present invention, but not to limit the scope of the invention, which is defined by the claims.
Unless otherwise specified, the test reagents and materials used in the examples of the present invention are commercially available.
Unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
In the present embodiment, the unit of volume may be cubic meters, cubic kilometers, etc., and the unit of weight may be grams, kilograms, etc., depending on the particular production situation.
The use of a certain large metal mine YTW waste rock yard in China is stopped for nearly 35 years, except for the places with serious weathered rocks, plants cannot grow in other places, the waste rocks are seriously acidified through field sampling analysis, the pH value of a leaching solution is 2.0-3.0, the acidity is strong, and the normal growth of plants is severely restricted; the vegetation recovery project which does not adopt any improved acidic measures in the early period has serious vegetation degradation, and the underground biomass of the plants is reduced by more than 80 percent compared with the normal growth.
Setting 6 experimental areas in the YTW waste rock yard, which are respectively marked as a block A, a block B, a block C, a block D, a block E and a block F, and are all in the same slope direction, and performing vegetation recovery construction on the blocks according to the following method, wherein the method comprises the following specific steps:
(1) terrain arrangement: in the 6 blocks, the top platform 1, the side slope 2 and the side slope platform 3 of the waste rock yard are respectively subjected to terrain arrangement, so that the side slope platform 3 inwards forms an inclination angle of 3 degrees, the top platform 1 outwards forms an inclination angle of 4 degrees, and the slope gradient is controlled to be 45-50 degrees;
(2) building a sewage-cleaning diversion project: criss-cross drainage ditches 4 are built in the waste stone yard, a good rainwater diversion system is built, sewage disposal and diversion of rainwater are realized, and leaching of rainwater is reduced to the maximum extent;
(3) preparing an acidic modified substrate: the acidic modified matrix consists of HDS bottom mud, lime powder, rice hulls and an organic polymerization crosslinking agent, and the usage amount of the four raw materials is determined according to the unit area of the waste rock yard to be recovered;
(4) preparation of concentrated slurry-like acidic modified material: adding the acidic modified substrate and water in the step (3) into a stirring tank of a hydraulic spray seeder according to the requirement of solid-to-liquid ratio, and stirring to form a thick slurry acidic modified material 5;
(5) constructing an acid-modified layer: and (3) spraying the concentrated slurry acidic modified material 5 prepared in the step (4) to the surface of the waste rock field to be recovered through a hydraulic spray seeder, and infiltrating the concentrated slurry acidic modified material 5 into deep waste rock 6 under the action of gravity flow to form a surface layer and a vertical acidic modified layer 7.
The section of the acidic modified layer formed by the acidic modified substrate prepared by using HDS sediment as a main raw material in the vegetation restoration construction of the waste rock site in the above embodiment is shown in fig. 1.
After the vegetation recovery construction is completed according to the steps, uniformly covering soil for 10cm, broadcasting broad-leaved grass with the same seed quantity, and verifying the improvement efficiency of different blocks by combining plant growth and the pH of the soil.
In the embodiment of the invention, the HDS bottom mud is the type I general industrial solid waste which is obtained from local materials, the water content of the HDS bottom mud is less than or equal to 40 percent, and the pH value is 6-7.5; the lime powder is a commercially available product; the rice hull is from a certain large-scale rice processing enterprise in China; the organic polymerization crosslinking agent is an organic polymerization crosslinking agent G-Tac product of the new concept environmental protection science and technology Limited company of the five great lakes of Shenzhen city.
Example 1
In this embodiment, the vegetation recovery construction is performed on the block a, and the related technical parameters are as follows:
(1) the proportion of the acidic modified substrate is as follows: the HDS bottom mud, lime powder, corresponds to the waste rock field per square meterThe rice husk and the organic polymerization crosslinking agent are respectively used in an amount of 0.2m32kg, 0.5kg and 5 g;
(2) the solid-to-liquid ratio of the concentrated slurry acidic modified material is 3: 10;
(3) the acid-improving material in a thick slurry state was sprayed five times onto the surface of the quarry, and finally an acid-improving layer having a thickness (a direction perpendicular to the surface of the metal ore quarry) of 1.0m was formed.
Example 2
In this embodiment, the vegetation recovery construction is performed on the block B, and the related technical parameters are as follows:
(1) the proportion of the acidic modified substrate is as follows: the HDS bottom mud, lime powder, rice husk and organic polymeric cross-linking agent are respectively used in an amount of 0.2m per square meter of waste rock field33kg, 0.8kg and 6 g;
(2) the solid-to-liquid ratio of the concentrated slurry acidic modified material is 4: 10;
(3) the acid-improving material in the form of a thick slurry was sprayed onto the surface of the quarry in seven passes to finally form an acid-improving layer having a thickness (direction perpendicular to the surface of the metal ore quarry) of 1.2 m.
Example 3
In this embodiment, the vegetation recovery construction is performed on the block C, and the related technical parameters are as follows:
(1) the proportion of the acidic modified substrate is as follows: the HDS bottom mud, lime powder, rice husk and organic polymeric cross-linking agent are respectively used in an amount of 0.2m per square meter of waste rock field33kg, 1.0kg and 8 g;
(2) the solid-to-liquid ratio of the concentrated slurry acidic modified material is 5: 10;
(3) the acid-denatured material in a thick slurry state was sprayed onto the surface of the quarry in eight times to finally form an acid-denatured layer having a thickness (direction perpendicular to the surface of the metal ore quarry) of 1.4 m.
Example 4
In this embodiment, the vegetation recovery construction is performed on the block D, and the related technical parameters are as follows:
(1) the proportion of the acidic modified substrate is as follows: the HDS bottom mud, the lime powder, the rice hulls and the organic polymer crosslinking agent are respectively used in the amount corresponding to each square meter of waste rock fieldIs 0.3m34kg, 1.0kg and 10 g;
(2) the solid-to-liquid ratio of the concentrated slurry acidic modified material is 5: 10;
(3) the acid-denatured material in a thick slurry state was sprayed to the surface of the quarry in eight times to finally form an acid-denatured layer having a thickness (direction perpendicular to the surface of the metal ore quarry) of 1.5 m.
Comparative example 1
In the comparative example, the vegetation restoration construction is performed on the block E by directly scattering lime powder instead of spraying the concentrated slurry acidic improving material in the example, and specifically, the scattering amount of the lime powder is 2.0kg per square meter of the waste rock field.
Comparative example 2
In the comparative example, the vegetation restoration construction is performed on the block F by directly scattering lime powder instead of spraying the concentrated slurry acidic improving material in the example, and specifically, the scattering amount of the lime powder is 4.0kg per square meter of the waste rock field.
Counting the germination rate, density, coverage, biomass and pH value of soil of the broadleaf weeds in each block, wherein the results are shown in the following tables 1-4; and on the basis, the effects of different vegetation recovery construction methods are contrastingly analyzed.
TABLE 1 germination percentage of broadleaf grass seeds in different blocks
Figure BDA0002458846140000091
TABLE 2 coverage and Density of broadleaf grass in different plots
Figure BDA0002458846140000092
TABLE 3 Biomass of broadleaf grass in different plots
Figure BDA0002458846140000093
TABLE 4 pH of the soil in different plots
Figure BDA0002458846140000094
The results in tables 1-4 are compared and analyzed, and it can be seen that different blocks exhibit different effects on germination rate, density, coverage, biomass and soil pH of wide-leaved grass seeds, which is generally shown that blocks a-D corresponding to examples 1-4 are significantly higher than blocks E-F corresponding to comparative examples 1-2, indicating that the manner of spraying the acidic amendment material in slurry form for multiple times is significantly better than the manner of directly scattering lime powder. In the initial improvement stage of the direct lime powder scattering mode, a large amount of lime powder is intensively attached to the surface of the waste stone, so that the strong alkalinity of local soil is caused, and the germination of seeds is inhibited; subsequently, under the leaching of rainwater, the lime powder is quickly leached out and cannot play a role in improving acidity for a long time, so that the pH of the soil in the area is gradually acidified, and the growth of plants is finally inhibited.
Finally, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims (9)

1. An acidic modified matrix of a metal ore waste rock yard is characterized by comprising HDS bottom mud, lime powder, rice hulls and an organic polymerization crosslinking agent;
corresponding to 1-3m3The addition amounts of the lime powder, the rice hull and the organic polymerization crosslinking agent are respectively 20-40kg, 5-10kg and 50-100 g;
the HDS bottom mud is waste obtained by recovering valuable elements from mine acidic wastewater and performing acid-base neutralization treatment by lime milk or carbide slag, the water content of the waste is less than or equal to 40 percent, and the pH value of the waste is 6-7.5;
the rice hulls are waste after rice processing;
the organic polymer cross-linking agent is a natural adhesive prepared by taking plant seeds as rubber powder and carrying out compound blending modification.
2. A vegetation recovery construction method for a metal ore waste rock yard is characterized by comprising the steps of pretreating the metal ore waste rock yard, uniformly mixing the acidic modified substrate of claim 1 with water to prepare a thick slurry acidic modified material, spraying the acidic modified material onto the surface of the metal ore waste rock yard to be recovered, and solidifying to form an acidic modified layer.
3. A vegetation restoration construction method according to claim 2, wherein the solid-to-liquid ratio of the acidic improving material is (3-5): 10.
4. a vegetation recovery construction method as claimed in claim 2, wherein the slope of the pretreated metal mine spoil site is 50 ° or less.
5. A vegetation restoration construction method according to claim 2, wherein during the spraying, the acidic improving material is controlled to be totally infiltrated into the barren rock gaps of the metal mine barren rock field, and the formed fluid is prevented from flowing on the surface of the metal mine barren rock field.
6. The vegetation restoration construction method according to any one of claims 2 to 5,
the acidic modified material is sprayed to the surface of the metal ore waste rock yard to be restored in a multi-spraying mode.
7. A method of recovering vegetation according to claim 6 wherein the jets are spaced apart to control the completion of consolidation of the last jet of acidic amendment material.
8. A vegetation restoration construction method according to any one of claims 2 to 5 wherein the thickness of the acid improving layer in the direction perpendicular to the surface of the metal mine spoil area is from 1.0 to 1.5 m.
9. The vegetation restoration construction method according to any one of claims 2 to 5,
the pretreatment of the metal ore waste rock yard specifically comprises the following steps: s1, respectively carrying out terrain arrangement on a top platform, a side slope and a side slope platform of the metal ore waste rock yard in blocks, ensuring the integral stability of the side slope platform and the top platform, and enabling the side slope platform and the top platform to form an inclination angle inwards and outwards respectively; s2, constructing criss-cross drainage ditches in the metal ore waste rock yard, constructing a good rainwater diversion system, and maximally reducing rainwater leaching;
and/or, the vegetation recovery construction method further comprises the steps of covering soil and sowing plant seeds after the acidic modifying material is solidified to form an acidic modifying layer.
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