阅读说明：本技术 复绿修复回填材料的制备方法 (Preparation method of composite green repairing backfill material ) 是由 夏明强 李龙涛 戴家生 郭富强 江华泳 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种复绿修复回填材料的制备方法,包括：获取原料,原料包括以重量份数计,客土100份,煤渣10-15份,干态的鼠茅草种0.5-2份,建筑固废10-20份,秸秆20-30份,熟石灰2-4份；预处理并破碎建筑固废：将建筑固废经过破碎机破碎后,过筛获得尺寸合格的建筑固废颗粒；预混秸秆和熟石灰：调整秸秆湿度,并将秸秆和熟石灰充分混合后,以适当压力压制熟化；鼠茅草种处理：将干态的鼠茅草种于室温状态下在混有适量吸附剂的水溶液中浸泡直至鼠茅草种适量增重；将客土、煤渣、干态的鼠茅草种、建筑固废、秸秆、熟石灰充分混合均匀即可。本方案操作方便简单,提供了一种高效复绿回填材料的制备方案,从而更高效地获得一种高质量的回填材料。(The invention discloses a preparation method of a re-greening restoration backfill material, which comprises the following steps: obtaining raw materials, wherein the raw materials comprise, by weight, 100 parts of extra soil, 10-15 parts of coal cinder, 0.5-2 parts of dry cymbopogon citratus seeds, 10-20 parts of building solid waste, 20-30 parts of straws and 2-4 parts of slaked lime; pretreating and crushing building solid waste: crushing the building solid waste by a crusher, and sieving to obtain building solid waste particles with qualified sizes; premixing straws and slaked lime: adjusting the humidity of the straws, fully mixing the straws with slaked lime, and pressing and slaking the mixture under proper pressure; and (3) treating the seeds of the common fescue: soaking the dry citionella seeds in the water solution mixed with a proper amount of the adsorbent at room temperature until the citionella seeds are properly weighted; mixing the soil, coal cinder, dry Cymbopogon citratus seed, solid waste of building, straw and slaked lime. The scheme is convenient and simple to operate, and provides a preparation scheme of the high-efficiency green-recovering backfill material, so that the high-quality backfill material can be obtained more efficiently.)

1. A preparation method of a complex green restoration backfill material comprises the following steps:

obtaining raw materials, wherein the raw materials comprise, by weight, 100 parts of soil, 10-15 parts of coal cinder, 0.5-2 parts of dry cymbopogon citratus seeds, 10-20 parts of building solid waste, 20-30 parts of straws and 2-4 parts of slaked lime;

pretreating and crushing building solid waste: crushing the building solid waste by a crusher, and sieving to obtain building solid waste particles with qualified sizes;

premixing straws and slaked lime: adjusting the humidity of the straws, fully mixing the straws with slaked lime, and pressing and slaking the mixture under proper pressure;

and (3) treating the seeds of the common fescue: soaking the dry citionella seeds in the water solution mixed with a proper amount of the adsorbent at room temperature until the citionella seeds are properly weighted;

mixing the soil, coal cinder, dry Cymbopogon citratus seed, solid waste of building, straw and slaked lime.

2. The method for preparing a re-greening restoration backfill material according to claim 1, wherein the construction solid waste comprises waste bricks or waste concrete precast blocks or foam concrete blocks.

3. The method for preparing the re-greening restoration backfill material according to claim 2, wherein the step of crushing the building solid waste is to crush waste bricks or waste concrete precast blocks to a particle size of 1-2 cm or to crush foam concrete blocks to a particle size of 0.5-1 cm by using a jaw crusher or a roller crusher.

4. A method for preparing a re-greening restoration backfill material according to any one of claims 1-3, characterized in that the construction solid waste is also sprayed with an acid solution at room temperature, and the spraying amount per cubic meter of construction solid waste is 10-20 Kg.

5. The method for preparing a composite green repairing backfill material according to the claim 4, characterized in that the acid solution is saturated calcium dihydrogen phosphate solution or 1M ammonium hydrogen sulfate solution.

6. The method for preparing a composite green restoration backfill material according to claim 1, wherein the straw and hydrated lime after mixing are pressed and hydrated to stack the mixed straw and hydrated lime to a height of 3-4m and cover a plastic film, and 200-400kg/m is applied by briquetting²Stacking for 6-8h under the pressure of (3).

7. The method for preparing a re-greening restoration backfill material according to claim 6, wherein the moisture content of the straw is 10-20 v/v%.

8. The method for preparing a re-greening restoration backfill material according to claim 1, characterized in that the citionella species is soaked to increase the weight by 10-20% during the citionella species treatment.

9. The method for preparing a greening restoration backfilling material according to claim 1, wherein the adsorbent is gelatinized starch or sodium polyacrylate.

10. The method of making a greenish restoration backfill material according to claim 9, wherein the adsorbent is present in the aqueous solvent in an amount of 0.1-0.3 wt.%.

Technical Field

The invention relates to an ecological restoration technology for a side slope of a mine pit, in particular to a preparation method of a re-greening restoration backfill material.

Background

The development and utilization of mineral resources such as coal and the like promote economic and social development and bring a series of ecological environment disasters. The method is characterized in that mine pits and the like left after the mining are finished can greatly influence the surface ecology and safety, the soil in a dumping field formed by stacking a large amount of stripped objects generated in the mining process is barren, in addition, the heavy truck rolls the soil in the dumping process to seriously compact the surface of the soil, so that the root pricking of plants is difficult, a large amount of surface runoff is formed under the rainfall condition, sedimentation cracks are generated due to the non-uniform sedimentation of the dumping field, the runoff is gathered and drilled into the cracks after rainfall, the infiltration is concentrated, the infiltration is exposed from the lower side slopes, and the collapse, the landslide and the slope debris flow are induced, and even the whole tatter is sunk. These all have a great influence on the production and life of the peripheral area.

For surface or underground leaving caused by production operation such as a mine pit, a landfill restoration scheme is generally adopted to restore the surface or underground leaving. In the traditional backfill materials, materials such as slag, concrete, industrial solid waste, building solid waste and the like are utilized in large quantity, and the recycling of waste resources is realized, but when the materials are soaked in underground water for a long time, alkaline substances are easily separated out to generate alkali return, so that the nutrition and planting capability of the backfill materials are influenced, and the greening work of a backfill area is further influenced. In addition, because the backfill material is relatively loose, water and soil loss is easy to generate, so that a protective net is usually covered on the ground in the conventional scheme, the construction time is prolonged, and the operation cost is increased. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a preparation method of a re-greening restoration backfill material, which obtains a re-greening restoration material for purposefully designing pits and the like by selecting and processing raw materials, effectively improves the recycling of waste resources, and is beneficial to improving the ecological restoration of backfill soil while enhancing the water and soil fixing capacity by adopting special auxiliary restoration plants.

In order to achieve the above object, an embodiment of the present invention provides a method for preparing a composite green repair backfill material, including: obtaining raw materials, wherein the raw materials comprise, by weight, 100 parts of soil, 10-15 parts of coal cinder, 0.5-2 parts of dry cymbopogon citratus seeds, 10-20 parts of building solid waste, 20-30 parts of straws and 2-4 parts of slaked lime; pretreating and crushing building solid waste: crushing the building solid waste by a crusher, and sieving to obtain building solid waste particles with qualified sizes; premixing straws and slaked lime: adjusting the humidity of the straws, fully mixing the straws with slaked lime, and pressing and slaking the mixture under proper pressure; and (3) treating the seeds of the common fescue: soaking the dry citionella seeds in the water solution mixed with a proper amount of the adsorbent at room temperature until the citionella seeds are properly weighted; mixing the soil, coal cinder, dry Cymbopogon citratus seed, solid waste of building, straw and slaked lime.

In one or more embodiments of the present invention, the construction waste comprises waste bricks or waste concrete precast blocks or foamed concrete blocks.

In one or more embodiments of the invention, the crushing of the solid waste of the building is to crush waste bricks or waste concrete precast blocks to a particle size of 1-2 cm or foam concrete blocks to a particle size of 0.5-1 cm by using a jaw crusher or a roller crusher.

In one or more embodiments of the invention, the construction solid waste is also subjected to spray treatment by using an acidic solution at room temperature, and the spray amount of the construction solid waste per cubic meter is 10-20 Kg.

In one or more embodiments of the invention, the acidic solution is a saturated solution of monocalcium phosphate or a 1M solution of ammonium bisulfate. The solution with weak acidity is selected, so that the short-term acid impact with overlarge acid concentration can be effectively avoided, the influence on the growth of the plants in the cymbopogon citratus or the restoration area is caused, and the environment friendliness is good while the acid-base property of the soil is balanced for a long time.

In one or more embodiments of the invention, the mixed straw and hydrated lime is pressed and hydrated to stack the mixed straw and hydrated lime to a height of 3-4m and cover a plastic film, and 200-400kg/m is applied by briquetting²Stacking for 6-8h under the pressure of (3).

In one or more embodiments of the invention, the moisture content of the straw is 10-20 v/v%.

In one or more embodiments of the invention, the citronella species is treated by soaking the citronella species to a weight gain of 10-20%.

In one or more embodiments of the invention, the adsorbent is gelatinized starch or sodium polyacrylate. Preferably, the adsorbent is present in the aqueous solvent in an amount of 0.1 to 0.3 wt.%.

Compared with the prior art, the method has the advantages that the operation is convenient, the operation convenience is good, the environment friendliness is good, the greening restoration backfill material obtained by the method fully utilizes industrial solid wastes as the backfill material, the waste resources are recycled, meanwhile, the solid wastes are utilized to provide trace elements for a backfill material area, all the micropore structures of the solid wastes are fully utilized, a proper amount of water storage and microorganism breeding space is provided underground, the fixation of fabric root systems in the restoration area and the development and growth of the root systems are facilitated, and the growth and development of the root systems are promoted. Of course, the water storage structures are also beneficial to increasing the storage of alkali educts in the solid waste and the neutralization reaction of the alkali educts with the stored calcium dihydrogen phosphate, playing a role in slow release and consumption, fixing elements such as phosphorus, calcium and the like, and simultaneously being beneficial to the storage of organic acid and nutrient elements generated by the decay of organic matters in a long term, thereby achieving the purposes of environmental alkali return and fertilizer storage. Meanwhile, the characteristics of the lemongrass are fully utilized, the soil fertility restoration of a restoration area is effectively enhanced while the normal green-recovering planting operation is not influenced, the absorption and storage of nutrient substances by solid waste micropores in backfill materials are accelerated, and the restoration efficiency and speed are effectively enhanced.

Detailed Description

The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Example 1

The re-greening restoration backfill material comprises, by weight, 100 parts of foreign soil, 10 parts of coal cinder and 0.5 part of dry cymbopogon citratus seeds, 10 parts of broken blocks particles with the particle size of 1-2 cm obtained by crushing waste bricks through a jaw crusher, 20 parts of straws and 2 parts of hydrated lime which are mixed in advance are added for fully mixing, after mixing, a mixture of straws (measured by compacted volume) with the water content of 10 v/v% and the hydrated lime is piled up to the height of 3m and covered with a plastic film, and then concrete is pressed into 200kg/m blocks²Is stored for 8 hours under the pressure of the straw, so as to realize the preliminary fibrosis and curing of the straw. Spraying saturated calcium dihydrogen phosphate solution at room temperature before mixing, wherein the spraying amount is 10kg/m³. The common fescue seeds are soaked in normal-temperature water added with 0.1 wt.% of gelatinized starch before being mixed until the weight of the grass seeds is increased by 10%.

In the implementation of the embodiment, the method is applied to open-air coal pits in certain places in Shanxi, the backfill material is 30cm thick, trees such as pine trees, fir trees and willow trees are planted on the ground after the restoration in spring, and the growth state of the citionella canadensis is monitored. The survival rate of green plants in one year is about 98%, the survival rate of green plants in two years is about 97%, the growth situation is good, the nutrition is not poor, the growth state is normal, and from 2 years to 5 years, compared with the growth situation of forest trees in the same area, the growth situation of the forest trees is increased by 5-10% by calculating the chest circumference of the forest trees at a distance of 1m from the ground every year.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches more than 70% in 3 months in the first year, the complete coverage is realized in 4-7 months in the current year, the organic matter content in the soil is increased by 0.8-1% in the current year after the lemongrass is completely rotted, and the organic matter content is gradually increased to 1.1-1.8%, 2.2-2.5%, 2.7-3.2% and 3.5-4% in the following 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

Example 2

The re-greening restoration backfill material comprises, by weight, 100 parts of foreign soil, 12 parts of coal cinder and 2 parts of dry cymbopogon citratus seeds, 15 parts of broken block particles with the particle size of 1-2 cm and obtained by crushing waste concrete precast blocks through a roller crusher, 22 parts of straws and 3 parts of hydrated lime which are mixed in advance are added for fully mixing, a mixture of the straws (measured by compacted volume) with the water content of 15 v/v% and the hydrated lime is stacked for 4m high and covered with a plastic film, and concrete briquettes are used for covering 400kg/m²Is stored for 7.5 hours under the pressure of the straw, so as to realize the preliminary fiberization and curing of the straw. Spraying saturated calcium dihydrogen phosphate solution at room temperature before mixing, wherein the spraying amount is 20kg/m³. The common fescue seeds are soaked in normal-temperature water added with 0.15 wt.% of gelatinized starch before being mixed until the weight of the grass seeds is increased by 20%.

In the implementation of the embodiment, the method is applied to open-air coal pits in certain places in Shanxi, the backfill material is 30cm thick, trees such as pine trees, fir trees and willow trees are planted on the ground after the restoration in spring, and the growth state of the citionella canadensis is monitored. The survival rate of green plants in one year is about 98%, the survival rate of green plants in two years is about 97%, the growth situation is good, the nutrition is not poor, the growth state is normal, and from 2 years to 5 years, compared with the growth situation of forest trees in the same area, the growth situation of the forest trees is increased by 5-10% by calculating the chest circumference of the forest trees at a distance of 1m from the ground every year.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches more than 70% in 3 months in the first year, the complete coverage is realized in 4-7 months in the current year, the organic matter content in the soil is increased by 0.7-1% in the current year after the lemongrass is completely rotted, and the organic matter content is gradually increased to 1.1-1.5%, 2.2-2.4%, 2.6-3.0% and 3.2-3.6% in the following 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

Example 3

The re-greening restoration backfill material comprises, by weight, 100 parts of foreign soil, 13 parts of coal cinder and 1.3 parts of dry cymbopogon citratus seeds, 20 parts of broken particles with the particle size of 1-2 cm, which are obtained by crushing waste concrete precast blocks by a jaw crusher, 28 parts of straws and 4 parts of hydrated lime which are mixed in advance, the mixture of the straws with the water content of 18 v/v% (measured by compacted volume) and the hydrated lime is piled up to the height of 3.4m and covered with a plastic film, and then concrete briquettes are used for covering the plastic film at the height of 300kg/m²Is stored for 6.5 hours under the pressure of the straw, so as to realize the preliminary fiberization and curing of the straw. Spraying saturated calcium dihydrogen phosphate solution at room temperature before mixing, wherein the spraying amount is 12kg/m³. Before mixing, the common fescue seeds are soaked in normal-temperature water added with 0.23 wt.% of sodium polyacrylate until the weight of the grass seeds is increased by 15%.

In the implementation of the embodiment, the method is applied to open-air coal pits in certain places in Shanxi, the backfill material is 30cm thick, trees such as pine trees, fir trees and willow trees are planted on the ground after the restoration in spring, and the growth state of the citionella canadensis is monitored. The survival rate of green plants in one year is about 98%, the survival rate of green plants in two years is about 97%, the growth situation is good, the nutrition is not poor, the growth state is normal, and from 2 years to 5 years, compared with the growth situation of forest trees in the same area, the growth situation of the forest trees is increased by 5-10% by calculating the chest circumference of the forest trees at a distance of 1m from the ground every year.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches more than 70% in 3 months in the first year, the complete coverage is realized in 4-7 months in the current year, the organic matter content in the soil is increased by 0.6-0.9% in the current year after the lemongrass is completely rotted, and the organic matter content is gradually increased to 1.1-1.6%, 2.1-2.3%, 2.7-3.1% and 3.4-3.8% in the following 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

Example 4

The green-recovery repair backfill material comprises, by weight, 100 parts of foreign soil and coal14 parts of slag, 1.8 parts of dry cymbopogon citratus seeds, 10 parts of broken particles with the particle size of 1-2 cm obtained by crushing waste concrete precast blocks by a roller crusher, 5 parts of broken particles with the particle size of 0.5-1 cm obtained by crushing foam concrete blocks, 23 parts of straws and 2.4 parts of hydrated lime which are mixed in advance are added for full mixing, after mixing, a mixture of straws (measured by compacted volume) with the water content of 13 v/v% and the hydrated lime is piled up to the height of 3.5m and covered with a plastic film, and then concrete briquettes are used for 250kg/m²Is stored for 7 hours under the pressure of the straw, so as to realize the preliminary fibrosis and curing of the straw. The construction solid waste is treated by 1M ammonium bisulfate solution spraying at room temperature before mixing, the spraying amount is 14kg/M³. The common fescue seeds are soaked in normal-temperature water added with 0.13 wt.% of gelatinized starch before being mixed until the weight of the grass seeds is increased by 18%.

In the implementation of the embodiment, the method is applied to open-air coal pits in certain places in Shanxi, the backfill material is 30cm thick, trees such as pine trees, fir trees and willow trees are planted on the ground after the restoration in spring, and the growth state of the citionella canadensis is monitored. The survival rate of green plants in one year is about 98%, the survival rate of green plants in two years is about 97%, the growth situation is good, the nutrition is not poor, the growth state is normal, and from 2 years to 5 years, compared with the growth situation of forest trees in the same area, the growth situation of the forest trees is increased by 7-12% by calculating the chest circumference of the forest trees at a distance of 1m from the ground every year.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches more than 70% in 3 months in the first year, the complete coverage is realized in 4-7 months in the current year, the organic matter content in the soil is increased by 0.9-1% in the current year after the lemongrass is completely rotted, and the organic matter content is gradually increased to 1.3-2.0%, 2.4-2.6%, 2.8-3.5% and 3.7-4.3% in the following 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

Example 5

The re-greening restoration backfill material comprises, by weight, 100 parts of foreign soil, 15 parts of coal cinder, 0.8 part of dry cymbopogon citratus seeds, 15 parts of broken blocks of 1-2 cm in particle size obtained by crushing waste bricks through a roller crusher, and foamed concrete blocks3 parts of the obtained broken particles with the particle size of 0.5-1 cm are added with 30 parts of straws and 3.6 parts of hydrated lime which are mixed in advance and fully mixed, after mixing, the mixture of the straws (measured by compacted volume) with the water content of 20 v/v% and the hydrated lime is piled up for 3.2m and covered with a plastic film, and then the mixture is pressed into blocks with the concrete of 350kg/m²Is stored for 6 hours under the pressure of the straw, so as to realize the preliminary fibrosis and curing of the straw. The construction solid waste is treated by 1M ammonium bisulfate solution spraying at room temperature before mixing, the spraying amount is 16kg/M³. Before mixing, the seeds of the common fescue are soaked in normal-temperature water added with 0.3 wt.% of sodium polyacrylate until the weight of the seeds is increased by 16%.

In the implementation of the embodiment, the method is applied to open-air coal pits in certain places in Shanxi, the backfill material is 30cm thick, trees such as pine trees, fir trees and willow trees are planted on the ground after the restoration in spring, and the growth state of the citionella canadensis is monitored. The survival rate of green plants in one year is about 98%, the survival rate of green plants in two years is about 97%, the growth situation is good, the nutrition is not poor, the growth state is normal, and from 2 years to 5 years, compared with the growth situation of forest trees in the same area, the growth situation of the forest trees is calculated by the chest circumference of the forest trees which are 1m away from the ground every year, the growth situation is increased by 8-13%.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches over 75% in 3 months in the first year, the complete coverage is realized in 4-7 months in the current year, the organic matter content in the soil is increased by 0.8-1.2% in the current year after the lemongrass is completely rotted, and the organic matter content is gradually increased to 1.5-1.8%, 2.3-2.7%, 2.8-3.4% and 3.7-4.2% in the following 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

Comparative example 1

The re-greening restoration backfill material of the comparative example comprises, by weight, 100 parts of foreign soil, 10 parts of coal cinder and 0.5 part of dry cymbopogon citratus seeds, 10 parts of broken particles with the particle size of 1-2 cm obtained by crushing waste concrete precast blocks by a jaw crusher, 20 parts of straws and 2 parts of hydrated lime which are mixed in advance are added for full mixing, a mixture of straws (measured by compacted volume) with the water content of 10 v/v% and the hydrated lime is piled up to 3m high and covered with a plastic film,then pressing the mixture into blocks of 200kg/m by using concrete²Is stored for 8 hours under the pressure of the straw, so as to realize the preliminary fibrosis and curing of the straw. Spraying saturated calcium dihydrogen phosphate solution at room temperature before mixing, wherein the spraying amount is 10kg/m³. Before mixing, the common fescue seeds are soaked in normal-temperature water added with 0.1 wt.% of gelatinized starch until the weight of the grass seeds is increased by 40%.

When the scheme is implemented, the application is carried out in an open-air coal mine pit in a place in Shanxi, the thickness of the backfill material is 30cm, after the restoration, the growth state of trees such as pine trees, fir trees, willow trees and the like planted on the ground is restored in spring, and meanwhile, the growth state of the lemongrass is monitored.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches 40-50% in 3 months in the first year, a large part of non-germination vacancy exists in a sowing area, partial seeds are found to mildew after soil turning, the organic matter content in the soil is increased by 0.1-0.2% in the current year after the lemongrass is completely rotten, and the organic matter content is gradually increased to 0.2-0.3%, 0.4-0.6%, 0.7-0.9% and 1-1.2% in the later 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

Comparative example 2

The re-greening restoration backfill material of the comparative example comprises, by weight, 100 parts of foreign soil, 10 parts of coal cinder and 0.5 part of dry cymbopogon citratus seeds, 10 parts of broken blocks particles with the particle size of 1-2 cm obtained by crushing waste bricks through a roller crusher, 20 parts of straws and 2 parts of hydrated lime which are mixed in advance are added for full mixing, the mixture of the straws with the water content of 10 v/v% (measured by compacted volume) and the hydrated lime is piled up to the height of 3m and covered with a plastic film, and then the mixture is pressed into 200kg/m by a concrete block²Is stored for 8 hours under the pressure of the straw, so as to realize the preliminary fibrosis and curing of the straw. Spraying saturated calcium dihydrogen phosphate solution at room temperature before mixing, wherein the spraying amount is 10kg/m³. The common fescue seeds are soaked in normal-temperature water added with 0.1 wt.% of gelatinized starch before being mixed until the weight of the grass seeds is increased by 5%.

When the scheme is implemented, the application is carried out in an open-air coal mine pit in a place in Shanxi, the thickness of the backfill material is 30cm, after the restoration, the growth state of trees such as pine trees, fir trees, willow trees and the like planted on the ground is restored in spring, and meanwhile, the growth state of the lemongrass is monitored.

Meanwhile, the growth state of the lemongrass in a pit repairing area is good, the coverage rate of the lemongrass on the ground surface reaches 40-50% in 3 months in the first year, a large part of non-germinated vacant area exists in a sowing area, the organic matter content in the soil is increased by 0.1-0.3% in the current year after the lemongrass are completely rotted, and the organic matter content is gradually increased to 0.4-0.5%, 0.5-0.7%, 0.8-1% and 1.1-1.3% in the following 2-5 years. And the pH value of the soil is monitored within 5 years of restoration, and the pH value of a restoration area is found to be stable without obvious alkali return.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.