Biomass fiber planting blanket for mine remediation and preparation method thereof

Abstract

The invention belongs to the technical field of ecological environmental protection treatment, and provides a biomass fiber planting blanket for mine remediation and a preparation method thereof, the biomass fiber planting blanket sequentially comprises a non-woven fabric layer, a plant fiber layer and a seed matrix layer from top to bottom; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: plant fibers and modified cellulose. The preparation method comprises the following steps: mixing the plant fibers and the modified cellulose according to the weight ratio, carding into a thin fiber web, paving between the non-woven fabric layer and the seed matrix layer, and carrying out compression molding to obtain the biomass fiber planting blanket. According to the biomass fiber planting blanket for mine remediation and the preparation method of the biomass fiber planting blanket, the excellent hydrophilic and water-retaining functions are achieved, the water storage performance of sand can be effectively improved, the acting force among sand grains can be enhanced, and the effects of wind resistance, water retention and fertilizer retention can be achieved in the early stage of plant germination; and the preparation method is simple, efficient and convenient to operate and popularize.

Description

Technical Field

[0001] The present invention belongs to the technical field of ecological environmental protection management, and specifically relates to a biomass fiber planting blanket for mine restoration and a preparation method thereof. Background Art

[0002] With the continuous development of mineral resources, the mining environment has been severely damaged. The exposed surface and damaged vegetation of the mines not only easily lead to problems such as soil erosion and ecological imbalance, but also affect the living environment of surrounding residents. Therefore, mine restoration is not only necessary to protect the ecological environment, but also an inevitable measure to improve the quality of local economic and social development.

[0003] As an innovative ecological restoration material, plant fiber blanket can effectively promote soil stability and plant growth to restore vegetation, and improve the stability and diversity of the ecosystem. In mine restoration and greening, it has the following characteristics and functions: it is made of plant fiber, can be naturally degraded, and has no pollution to the environment; it has good anti-scour performance, can effectively prevent soil erosion, and protect the stability of the slope. It can promote the growth of vegetation and greening restoration; the construction is simple, easy to carry and lay, and the construction efficiency is high; it has good water permeability and will not cause soil erosion. At present, the commonly used plant fiber blanket is coconut fiber blanket. Unlike most plant fibers, coconut fiber has a high cellulose content and a low hemicellulose content, so its hydrophilicity is weak. In the application of mine restoration and greening, the weak water absorption and water retention capacity of the plant fiber blanket can easily lead to excessive slope precipitation runoff, thereby impacting the unplanted vegetation and loosened soil. Therefore, in actual application, when the water flow is too large, the vegetation is prone to fall over or even be washed away, which reduces the survival rate of the vegetation; at the same time, the soil on the surface of the slope is also easily washed away, leading to serious soil erosion.

[0004] Therefore, further research is needed to develop an environmentally friendly and ecological product for mine ecological restoration projects. Summary of the invention

[0005] In order to solve the impact of excavation and stacking of waste slag in mines on the surrounding ecology, as well as environmental problems such as landslides and soil erosion, the present invention provides a biomass fiber planting blanket for mine restoration and a preparation method thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The first aspect of the present invention provides a biomass fiber planting blanket for mine restoration, which comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: plant fiber, modified cellulose.

[0008] As a further embodiment of the present invention, the mass ratio of plant fiber to modified cellulose in the raw material of the plant fiber layer is (7:3)-(9:1).

[0009] As a further embodiment of the present invention, the modified cellulose is prepared by the following steps:

[0010] Add cellulose to sodium hydroxide solution, stir until uniform, freeze for 10-15 minutes, add humic acid, ultrasonically disperse until uniform, add acrylic acid, N,N-methylenebisacrylamide and potassium persulfate in sequence, heat to 80-85°C under nitrogen atmosphere, stir and react for 3-5 hours, cool to room temperature, filter, wash and dry to obtain modified cellulose.

[0011] As a further embodiment of the present invention, the usage ratio of cellulose, sodium hydroxide solution, humic acid, acrylic acid, N,N-methylenebisacrylamide and potassium persulfate is 0.15-0.18 g: 30 mL: 0.10-0.12 g: 20 mL: 0.006 g: 0.16 g.

[0012] As a further embodiment of the present invention, the cellulose is chitosan cellulose, cellulose xanthate, or carboxymethyl cellulose. Cellulose contains a large amount of hydrophilic polyhydroxy compounds, so it has high water holding capacity, and the above celluloses are all degradable.

[0013] As a further solution of the present invention, the plant fiber is at least one of coconut fiber, bamboo fiber, straw fiber, palm fiber and wheat straw fiber. Plant fiber can effectively prevent rainwater erosion, and after degradation, it can provide nutrients to the soil, promote vegetation growth, and has a fast greening speed and excellent moisture conservation effect.

[0014] As a further embodiment of the present invention, the seeds in the seed matrix layer include grass seeds and shrub seeds.

[0015] As a further embodiment of the present invention, the grass species is at least one of Artemisia ordosica, Icegrass, Astragalus, Camelthorn, Setaria, Achnatherum splendens, Lolium, Alfalfa, Trifolium repens, and Zoysia japonica. The root system of herbaceous plants is shallow, and they have the functions of rapid coverage, soil consolidation and erosion prevention, and water retention, which can effectively prevent initial soil and water loss and create good soil conditions for the subsequent growth of vegetation.

[0016] As a further embodiment of the present invention, the shrub species is at least one of Sophora alopecuroides, Hippophae rhamnoides, Calligonum mongolicum, Apocynum venetum, Caragana korshinskii, Typhonium barometz, Amorpha fruticosa, Forsythia suspensa, Croton dahliae, Rhus chinensis, and Leucaena leucophylla. The root system of shrubs is deep and wide, and they have strong stress resistance and adaptability, can improve soil structure, enhance soil water retention capacity, and have a significant impact on water cycle, playing an important role in the middle and late stages of vegetation restoration. In addition, the growth of shrubs can gradually replace herbaceous plants to form a stable ecosystem.

[0017] The second aspect of the present invention provides a method for preparing a biomass fiber planting blanket for mine restoration, comprising the following steps:

[0018] The plant fiber and modified cellulose are mixed according to a weight ratio and then combed into a thin fiber web, which is then spread between a non-woven fabric layer and a seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0019] Beneficial effects of the present invention:

[0020] The biomass fiber planting blanket provided in the present invention is stacked from top to bottom and includes a non-woven fabric layer, a plant fiber layer and a seed matrix layer, and is finally pressed and formed. The plant fiber layer has excellent hydrophilic and water-retaining functions, can effectively improve the water storage performance of the sand body, can cover the surface over a large area, enhance the interaction between sand particles, and can play a role in wind resistance, water retention and fertilizer retention in the early stage of plant germination; the grass seeds and shrub species in the seed matrix layer can be suitable for growth under the matrix, and the roots can be effectively attached to the matrix and the land, with good protection, and can be widely used in the fields of mine ecological slope protection, soil and water loss prevention and control.

[0021] The modified cellulose in the present invention is copolymerized with humic acid and polypropylene under the action of an initiator and a cross-linking agent to obtain the modified cellulose. Humic acid is a natural organic macromolecular compound containing a large number of functional hydrophilic groups such as carboxyl, hydroxyl and amino groups, which greatly improves the hydrophilicity and further improves the water absorption rate of cellulose. In addition, humic acid also has physiologically active free radicals, which prompt humic acid to copolymerize with cellulose and acrylic acid in the presence of N, N-methylenebisacrylamide and potassium persulfate to form a three-dimensional network structure, thereby absorbing water without dissolving, thereby improving the water retention capacity of cellulose. In the modified cellulose system, there is not only a hydrogen bond network system composed of hydrogen bonds formed by containing a large number of hydroxyl groups, but also a three-dimensional network system formed by copolymerization. Therefore, there is a physical and chemical double cross-linking system in the modified cellulose, which improves the water absorption and water retention performance while also having excellent regeneration performance, greatly prolonging the action time of the biomass fiber planting blanket.

[0022] In the present invention, the types of grass seeds and shrub species in the seed matrix layer are reasonably screened and the grass seeds and shrub species are used in combination. The rapid coverage of herbaceous plants is combined with the long-term protection of shrubs to achieve the stability of the mine surface and the recovery of the ecosystem. The mixed use method can not only effectively control the initial soil and water loss, but also gradually form a stable vegetation community in the long term, effectively improving the overall effect of the mine restoration project.

[0023] The invention provides a method for preparing a biomass fiber planting blanket for mine restoration, which is simple and efficient to operate, convenient for production, and provides an effective means for mine restoration. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Obviously, the following descriptions are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in the field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0026] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter described in the claims.

[0027] In the present application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, a~b (i.e. a and b), a~c, b~c, or a~b~c, where a, b, c can be single or multiple, respectively.

[0028] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0029] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0031] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution, and all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0032] Example 1

[0033] This embodiment provides a modified cellulose, and the preparation steps are as follows:

[0034] 0.15 g of chitosan cellulose was added to 30 mL of sodium hydroxide solution (concentration of 15%), stirred until uniform, frozen for 15 min, 0.10 g of humic acid was added, ultrasonically dispersed until uniform, 20 mL of acrylic acid, 0.006 g of N, N-methylenebisacrylamide and 0.16 g of potassium persulfate were added in sequence, and the temperature was raised to 80 ° C under nitrogen atmosphere, stirred and reacted for 5 h, cooled to room temperature, filtered, washed, and finally placed in a 70 ° C oven to dry for 12 h to obtain modified cellulose.

[0035] Example 2

[0036] This embodiment provides a modified cellulose, and the preparation steps are as follows:

[0037] 0.165 g of chitosan cellulose was added to 30 mL of sodium hydroxide solution (concentration of 15%), stirred until uniform, frozen for 15 min, 0.11 g of humic acid was added, ultrasonically dispersed until uniform, 20 mL of acrylic acid, 0.006 g of N, N-methylenebisacrylamide and 0.16 g of potassium persulfate were added in sequence, and the temperature was raised to 80 ° C under nitrogen atmosphere, stirred and reacted for 5 h, cooled to room temperature, filtered, washed, and finally placed in a 70 ° C oven to dry for 12 h to obtain modified cellulose.

[0038] Example 3

[0039] This embodiment provides a modified cellulose, and the preparation steps are as follows:

[0040] 0.18 g of chitosan cellulose was added to 30 mL of sodium hydroxide solution (concentration of 15%), stirred until uniform, frozen for 15 min, 0.12 g of humic acid was added, ultrasonically dispersed until uniform, 20 mL of acrylic acid, 0.006 g of N, N-methylenebisacrylamide and 0.16 g of potassium persulfate were added in sequence, and the temperature was raised to 80 ° C under nitrogen atmosphere, stirred and reacted for 5 h, cooled to room temperature, filtered, washed, and finally placed in a 70 ° C oven to dry for 12 h to obtain modified cellulose.

[0041] Example 4

[0042] The present embodiment provides a biomass fiber planting blanket for mine restoration, which comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber and the modified cellulose in Example 1.

[0043] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides.

[0044] The preparation steps are as follows:

[0045] The plant fiber and the modified cellulose in Example 1 were mixed in a weight ratio of 7:3 and combed into a thin fiber web, which was then laid between the non-woven fabric layer and the seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0046] Example 5

[0047] The present embodiment provides a biomass fiber planting blanket for mine restoration, which comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber and modified cellulose in Example 2.

[0048] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides.

[0049] The preparation steps are as follows:

[0050] The plant fiber and the modified cellulose in Example 2 were mixed in a weight ratio of 7:3 and combed into a thin fiber web, which was then laid between the non-woven fabric layer and the seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0051] Example 6

[0052] This embodiment provides a biomass fiber planting blanket for mine restoration, which includes a non-woven fabric layer, a plant fiber layer and a seed matrix layer from top to bottom; the seed matrix layer includes seeds and a matrix; the plant fiber layer includes the following raw materials: coconut fiber and modified cellulose in Example 3.

[0053] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides.

[0054] The preparation steps are as follows:

[0055] The plant fiber and the modified cellulose in Example 3 were mixed in a weight ratio of 7:3 and combed into a thin fiber web, which was then laid between the non-woven fabric layer and the seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0056] Example 7

[0057] This embodiment provides a biomass fiber planting blanket for mine restoration, which includes a non-woven fabric layer, a plant fiber layer and a seed matrix layer from top to bottom; the seed matrix layer includes seeds and a matrix; the plant fiber layer includes the following raw materials: bamboo fiber and modified cellulose in Example 1.

[0058] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica and Icegrass, and the shrub seeds are Sophora alopecuroides and Hippophae rhamnoides.

[0059] The preparation steps are as follows:

[0060] The plant fiber and the modified cellulose in Example 1 were mixed in a weight ratio of 8:2 and combed into a thin fiber web, which was then laid between the non-woven fabric layer and the seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0061] Example 8

[0062] This embodiment provides a biomass fiber planting blanket for mine restoration, which includes a non-woven fabric layer, a plant fiber layer and a seed matrix layer from top to bottom; the seed matrix layer includes seeds and a matrix; the plant fiber layer includes the following raw materials: coconut fiber and bamboo fiber, and the modified cellulose in Example 3.

[0063] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides and Caragana korshinskii.

[0064] The preparation steps are as follows:

[0065] The (plant fiber and bamboo fiber) and the modified cellulose in Example 3 were mixed in a weight ratio of 9:1 and combed into a thin fiber web, which was then laid between the non-woven fabric layer and the seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0066] Comparative Example 1

[0067] Compared with Example 4, this comparative example provides a biomass fiber planting blanket for mine restoration, wherein the plant fiber layer does not contain modified cellulose:

[0068] A biomass fiber planting blanket for mine restoration comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber.

[0069] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides.

[0070] The preparation steps are as follows:

[0071] The plant fibers are combed into a thin fiber web, which is then laid between a non-woven fabric layer and a seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0072] Comparative Example 2

[0073] Compared with Example 4, this comparative example provides a biomass fiber planting blanket for mine restoration, wherein the plant fiber layer is added with unmodified cellulose:

[0074] A biomass fiber planting blanket for mine restoration comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber and cellulose.

[0075] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides.

[0076] The preparation steps are as follows:

[0077] The plant fiber and cellulose are mixed in a weight ratio of 7:3 and combed into a thin fiber web, which is then laid between a non-woven fabric layer and a seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0078] Comparative Example 3

[0079] Compared with Example 4, this comparative example provides a biomass fiber planting blanket for mine restoration, wherein the seeds in the seed matrix layer are only grass seeds:

[0080] A biomass fiber planting blanket for mine restoration comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber and the modified cellulose in Example 1.

[0081] The seeds in the seed matrix layer include grass seeds, and the grass seeds are Artemisia ordosica.

[0082] The preparation steps are as follows:

[0083] The plant fiber and modified cellulose are mixed in a weight ratio of 7:3 and combed into a thin fiber web, which is then laid between a non-woven fabric layer and a seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0084] Comparative Example 4

[0085] Compared with Example 4, this comparative example provides a biomass fiber planting blanket for mine restoration, wherein the seeds in the seed matrix layer are only shrub species:

[0086] The present embodiment provides a biomass fiber planting blanket for mine restoration, which comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber and the modified cellulose in Example 1.

[0087] The seeds in the seed matrix layer include shrub species, and the shrub species is Sophora alopecuroides.

[0088] The preparation steps are as follows:

[0089] The plant fiber and modified cellulose are mixed in a weight ratio of 7:3 and combed into a thin fiber web, which is then laid between a non-woven fabric layer and a seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0090] Comparative Example 5

[0091] Compared with Example 4, this comparative example provides a biomass fiber planting blanket for mine restoration, wherein the mass ratio of the coconut fiber in the plant fiber layer to the modified cellulose in Example 1 is different:

[0092] A biomass fiber planting blanket for mine restoration comprises, from top to bottom, a non-woven fabric layer, a plant fiber layer and a seed matrix layer; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: coconut fiber and the modified cellulose in Example 1.

[0093] The seeds in the seed matrix layer include grass seeds and shrub seeds, the grass seeds are Artemisia ordosica, and the shrub seeds are Sophora alopecuroides.

[0094] The preparation steps are as follows:

[0095] The plant fiber and the modified cellulose in Example 1 were mixed in a weight ratio of 6:3 and combed into a thin fiber web, which was then laid between the non-woven fabric layer and the seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

[0096] The biomass fiber planting blankets for mine restoration obtained in Examples 4 to 8 and Comparative Examples 1 to 5 were subjected to application tests:

[0097] Determination of water absorption rate of biomass fiber planting blanket for mine restoration:

[0098] Cut a 10cm×10cm biomass fiber planting blanket for mine restoration and weigh the initial weight M1; place it on a metal net with an inclination angle of 20 degrees, then evenly spray 1 liter of water, drain for 10 minutes, and weigh the final weight M2 of the pre-planted fiber blanket after spraying water. The water absorption rate is calculated as follows:

[0099] W=(M2-M1) / M1×100%

[0100] The biomass fiber planting blanket for mine restoration in the embodiment and the comparative example was divided into blocks of 1.5m×2m, and the weight control standard was 5±0.2kg / m, and applied to the mine restoration and protection test. After 7 days of maintenance, the germination rate, grass coverage rate, and water retention rate were measured. The test results are shown in Table 1:

[0101] Table 1

[0102]

[0103]

[0104] It can be seen from Table 1 that the water absorption rate, water retention rate, germination rate and grass coverage rate of the biomass fiber planting blanket for mine restoration prepared in Examples 4-8 are all higher than those of the biomass fiber planting blanket for mine restoration prepared in Comparative Examples 1-5. It can be seen that the biomass fiber planting blanket for mine restoration provided in the present invention and the preparation method thereof have excellent hydrophilic and water-retaining functions, can effectively improve the water storage performance of the sand body, enhance the interaction between sand particles, and can play a role in wind resistance, water retention and fertilizer retention in the early stage of plant germination; and the preparation method is simple and efficient, easy to operate and promote.

[0105] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0106] It should be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation regulations of this application.

[0107] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A biomass fiber planting blanket for mine restoration, characterized in that: It comprises a non-woven fabric layer, a plant fiber layer and a seed matrix layer in order from top to bottom; the seed matrix layer comprises seeds and a matrix; the plant fiber layer comprises the following raw materials: plant fiber and modified cellulose.

2. The biomass fiber planting blanket for mine restoration according to claim 1 is characterized in that: The mass ratio of plant fiber and modified cellulose in the raw materials of the plant fiber layer is (7:3)-(9:1).

3. The biomass fiber planting blanket for mine restoration according to claim 1 is characterized in that: Modified cellulose is prepared by the following steps: Add cellulose to sodium hydroxide solution, stir until uniform, freeze for 10-15 minutes, add humic acid, ultrasonically disperse until uniform, add acrylic acid, N,N-methylenebisacrylamide and potassium persulfate in sequence, heat to 80-85°C under nitrogen atmosphere, stir and react for 3-5 hours, cool to room temperature, filter, wash and dry to obtain modified cellulose.

4. The biomass fiber planting blanket for mine restoration according to claim 3 is characterized in that: The dosage ratio of cellulose, sodium hydroxide solution, humic acid, acrylic acid, N,N-methylenebisacrylamide and potassium persulfate is 0.15-0.18 g: 30 mL: 0.10-0.12 g: 20 mL: 0.006 g: 0.16 g.

5. The biomass fiber planting blanket for mine restoration according to claim 1 is characterized in that: The cellulose is chitosan cellulose, cellulose xanthate, or carboxymethyl cellulose.

6. The biomass fiber planting blanket for mine restoration according to claim 1 is characterized in that: The plant fiber is at least one of coconut fiber, bamboo fiber, straw fiber, palm fiber and wheat straw fiber.

7. The biomass fiber planting blanket for mine restoration according to claim 1 is characterized in that: The seeds in the seed matrix layer include grass seeds and shrub seeds.

8. The biomass fiber planting blanket for mine restoration according to claim 7, characterized in that: The grass species is at least one of Artemisia ordosica, Ice grass, Astragalus membranaceus, Camel thorn, Setaria viridis, Achnatherum splendens, Ryegrass, Alfalfa, White clover, and Zoysia knotweed.

9. The biomass fiber planting blanket for mine restoration according to claim 7, characterized in that: The shrub species is at least one of Sophora alopecuroides, Hippophae rhamnoides, Calligonum mongolica, Apocynum venetum, Caragana korshinskii, Amorpha fruticosa, Forsythia suspensa, Croton rotundus, Rhus chinensis, and Leucaena leucophylla.

10. A method for preparing a biomass fiber planting blanket for mine restoration according to any one of claims 1 to 9, characterized in that: The following steps are involved: The plant fiber and modified cellulose are mixed according to a weight ratio and then combed into a thin fiber web, which is then spread between a non-woven fabric layer and a seed matrix layer and pressed into shape to obtain a biomass fiber planting blanket.

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