A method for in-situ greening of red mud dump

Abstract

The invention discloses a restoration method for in-situ greening of a red mud dump, comprising the steps of preparing an auxiliary modifier; adding materials for mixing treatment; static maintenance and restoration; modified restoration inspection; and plant test planting. The invention measures the pH value, alkali concentration restoration rate, and the amount of microorganisms and organic matter of a red mud soil mixture. Before actually being put into planting, the restored red mud soil mixture can be put into trial planting by a trial planting method. Based on the measurement of modified restoration parameters, the actual trial planting method is used to further accurately judge the planting effect of the restored red mud soil mixture on plants. By calculating the germination rate of the test-planted plants, it is convenient to judge whether the restored red mud soil mixture can be formally put into plant planting by the germination rate, thereby facilitating the determination of the actual planting effect of the red mud soil mixture on plants by a method of seeing the big from the small.

Description

Technical Field

[0001] The invention relates to the technical field of red mud restoration and treatment, and in particular to a method for in-situ greening of a red mud dump. Background Art

[0002] Red mud is a waste product produced by the alumina industry. Every ton of alumina produced will produce 1-2 tons of red mud waste residue. The main treatment methods are landfill and stockpiling. With the continuous development of the alumina industry, the red mud produced has occupied a large amount of land resources and brought great harm to the ecological environment. The soil in the red mud dump is highly salty and alkaline, nutrient-poor, and has poor soil structure properties, which seriously inhibits the normal growth of plants, making it difficult for the red mud dump to achieve ecological restoration independently. Therefore, the most effective way to treat red mud on a large scale is to reduce the alkali content of red mud and modify it into soil where plants can be grown.

[0003] However, in the current methods of repairing red mud dumps, there is a lack of means to carry out modified repair and inspection of the repaired red mud soil mixture during the repair process. As a result, the existing repair technology cannot accurately know the actual repair effect of the red mud dump after repairing the red mud dump. As a result, rashly putting the repaired red mud dump into planting use is likely to cause greater impact on the environment, further increasing the difficulty of subsequent repair and maintenance. Summary of the invention

[0004] The present invention provides a method for in-situ greening of a red mud dump, which can effectively solve the problem that in the current method for red mud dump restoration proposed in the above background technology, due to the lack of means for modifying and inspecting the repaired red mud soil mixture during the restoration process, the existing restoration technology cannot accurately know the actual restoration effect of the red mud dump after the restoration treatment, and the rash use of the repaired red mud dump for planting is likely to cause greater impact on the environment, further increasing the difficulty of subsequent restoration and maintenance.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for in-situ greening of a red mud dump, comprising the following restoration steps:

[0006] S1, preparing an auxiliary modifier;

[0007] S2, adding materials and mixing;

[0008] S3, static maintenance and repair;

[0009] S4, modification and repair inspection;

[0010] S5. Plant experimental planting.

[0011] According to the above technical solution, in S1, preparing the auxiliary modifier refers to mixing the modifier through a mixing device. During the processing, a certain amount of phosphogypsum and a certain amount of auxiliary modifier are first selected, and the selected phosphogypsum and auxiliary modifier are added to the mixing device for uniform mixing to obtain the auxiliary modifier.

[0012] According to the above technical solution, the auxiliary modifiers are peat soil, biomass sawdust and humic acid;

[0013] Among them, the usage of phosphogypsum accounts for 10wt% of the total amount, the usage of peat soil in the auxiliary modifier accounts for 11wt% of the total amount, the usage of biomass sawdust in the auxiliary modifier accounts for 3wt% of the total amount, and the usage of humic acid in the auxiliary modifier accounts for 6wt% of the total amount.

[0014] According to the above technical solution, in S2, the adding and mixing treatment refers to mixing the red mud and the auxiliary modifier obtained after mixing by the same mixing equipment to obtain a red mud mixture. During the adding process of the red mud, the original alkali concentration of the red mud needs to be measured and recorded, and the original alkali concentration of the red mud is recorded as N1;

[0015] After the auxiliary modifier and red mud are fully mixed by the mixing equipment, the red mud mixture in the mixing equipment is sent to the curing pool. The specification of the curing pool is 1.5m*1.5m*1.5m. When the red mud mixture is filled into the curing pool, it is necessary to fill two-thirds of the red mud mixture in the curing pool. The volume of the red mud mixture after filling is 1m*1m*1m. After the red mud mixture is filled in the curing pool, the surface of the red mud mixture is scraped and leveled. After the red mud mixture is filled, water is evenly poured into the curing pool through a water distribution spray mechanism. The red mud mixture in the curing pool is watered, and the watering time is controlled to be 3min. After the watering is completed, the top of the curing pool is covered, pressed and sealed.

[0016] According to the above technical solution, in S3, the static curing and repairing refers to curing, modifying and repairing the red mud mixture after the red mud mixture is filled into the curing pool;

[0017] During the curing and modification process, the volume of the red mud mixture needs to be calculated. The calculation process is mainly based on the depth of the red mud mixture in the curing tank to calculate the change in the volume of the red mud mixture. When the depth of the red mud mixture after curing changes to Hm, the volume of the red mud mixture after curing is 1m*1m*Hm;

[0018] During the curing and modification of the red mud mixture in the curing tank, precipitate will seep out of the curing tank on the first, second and third days of curing the red mud mixture. After the precipitate seeps out, the precipitate seeping out of the curing tank on the first, second and third days is collected and processed respectively, and on the first, second and third days, the collected precipitate is transported to the precipitate sprayer respectively, and the precipitate collected on the first, second and third days is subjected to liquid distribution treatment by the precipitate sprayer, so that the seeped precipitate is returned to the curing tank after liquid distribution.

[0019] According to the above technical solution, in S4, the modified restoration test refers to measuring and processing the modified restoration parameters of the red mud mixture in the curing pool when the red mud mixture is cured to the fifth day;

[0020] The measurement process specifically includes measuring the pH value of the red mud mixture, measuring the alkali concentration repair rate of the red mud mixture, and measuring the microorganisms and organic matter of the red mud mixture.

[0021] According to the above technical solution, the pH value measurement of the red mud mixture specifically refers to measuring the pH value of the red mud mixture after five days of curing, recording the pH value measurement, and setting the standard pH value to 8 after the pH value measurement. When the pH value of the red mud mixture is greater than 8, it means that the alkali concentration of the red mud mixture is high. When the pH value of the red mud mixture is less than or equal to 8, it means that the alkali concentration of the red mud mixture meets the requirements of cultivated soil.

[0022] When the pH value of the red mud mixture is measured to be less than or equal to 8, it is necessary to repeatedly test three different positions of the red mud mixture three times. When the three test results are all less than or equal to 8, it means that the red mud mixture can be normally put into farming as arable soil;

[0023] When the pH value of the red mud mixture is greater than 8, the red mud mixture needs to be subjected to pH balance and neutralization treatment, and the amount of auxiliary modifier in the red mud mixture needs to be increased. The added auxiliary modifier needs to be mixed and stirred with the original red mud mixture to ensure that the added auxiliary modifier and the original red mud mixture are evenly mixed. After the added auxiliary modifier and the original red mud mixture are evenly mixed, the red mud mixture after the balance and neutralization treatment needs to be cured again, and the curing time is three days.

[0024] According to the above technical solution, the measurement of the alkali concentration restoration rate of the red mud mixture specifically refers to the detection of the alkali concentration treatment effect of the red mud mixture after five days of curing. In the measurement process, the alkali concentration of the red mud mixture after five days of curing is first measured, and the alkali concentration of the red mud mixture after curing is recorded as N2, then the alkali concentration restoration rate

[0025] In the above formula: N: alkali concentration repair rate, N1: original alkali concentration of red mud, N2: alkali concentration of red mud mixture after curing treatment.

[0026] According to the above technical solution, the measurement of microorganisms and organic matter in the red mud mixture specifically refers to the detection of the types and quantities of microorganisms and the content of organic matter in the red mud mixture after five days of curing.

[0027] According to the above technical solution, in S5, the plant test planting refers to selecting a portion of the red mud mixture in the curing pool for test planting of plants after the red mud mixture is cured in the curing pool for five days and the modified restoration parameters of the red mud mixture are measured, wherein the plant to be planted in the test is ryegrass;

[0028] In the experimental planting process, ryegrass plant seeds are selected, and then 100 ryegrass plant seeds are planted for the test. After planting, watering and maintenance are carried out regularly, and after 28 days of planting, the germination rate and growth state of the ryegrass are observed, and the number of germinated ryegrass is recorded as K, and the germination rate = (K / 100)*100%;

[0029] After measuring the germination rate of the test plants, when the germination rate is greater than 60%, it means that the red mud soil mixture after maintenance can be normally used for plant planting. When the germination rate is lower than 60%, it means that the red mud soil mixture is not conducive to the normal planting of plants. Therefore, when the germination rate is lower than 60%, the red mud soil mixture needs to be re-maintained and repaired.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the process of preparing the mixture of the auxiliary modifier and red mud, the added phosphogypsum, the auxiliary modifier and the red mud are fully stirred and mixed, so that the auxiliary modifier can more effectively act on the maintenance and repair of the red mud, thereby improving the actual modification and repair effect of the auxiliary modifier on the red mud, ensuring that the treated red mud mixture can be more effectively used in the planting operation of plants, realizing the rapid reduction of the alkalinity of the red mud, improving the properties of the red mud soil, and making the red mud soil quickly suitable for plant growth;

[0032] In addition, the selected modifiers are mainly common waste materials, which are not only inexpensive but also sustainably supplied. At the same time, the test of the modifiers can provide a large amount of organic matter for the red mud soil, thereby providing nutrients for the subsequently planted plants, further improving the planting capacity of the repaired red mud soil.

[0033] 2. In the process of curing and modifying the red mud mixture, the precipitate seeping out of the curing tank is spread through the precipitate sprayer, so that the precipitate seeping out of the curing tank can be returned to the curing tank by spreading, and the precipitate can be fully and evenly combined with the red mud mixture in the curing tank again, thereby ensuring the effect of subsequent modification and repair of the red mud mixture in the curing tank.

[0034] 3. After the red mud mixture in the curing pool has been cured and modified, the modified and remediated parameters of the red mud mixture in the curing pool are measured and processed, so that the staff can understand the pH value of the red mud mixture, the alkali concentration remediation rate of the red mud mixture, the amount of microorganisms and organic matter. By measuring the pH value, alkali concentration remediation rate, microorganisms and organic matter of the red mud mixture, people can have a clearer understanding of the pH value, alkali concentration treatment effect, microorganisms and organic matter of the red mud mixture after curing and remediation, which makes it easier for people to judge the modified and remediated effect of the red mud mixture in time, and then put the remediated red mud mixture into planting for use.

[0035] 4. Based on the measurement of the pH value, alkali concentration restoration rate, and the amount of microorganisms and organic matter of the red mud mixture, the present invention can put the repaired red mud mixture into trial planting through a trial planting method before it is actually put into planting, so as to facilitate the further accurate judgment of the planting effect of the repaired red mud mixture on plants through an actual trial planting method based on the measurement of the modified restoration parameters, and by calculating the germination rate of the test plant plants, it is convenient to judge whether the repaired red mud mixture can be formally put into plant planting through the germination rate, so as to facilitate the determination of the actual planting effect of the red mud mixture on plants by a method of seeing the big picture from the small, so as to prevent the direct use without judgment, causing environmental pollution and loss of plant resources.

[0036] In summary, in the process of repairing red mud soil, by measuring the pH value, alkali concentration repair rate, the amount of microorganisms and organic matter of the red mud mixture and combining it with test planting, we can prevent the repaired red mud mixture from not being tested and treated, causing the red mud mixture to cause deeper pollution to the environment, prevent secondary pollution caused by red mud, and reduce the difficulty of subsequent secondary repair of the repaired red mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 It is a flow chart of the steps of the repair method of the present invention. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] Example 1: Figure 1 As shown, the present invention provides a technical solution, a method for in-situ greening of a red mud dump, comprising the following restoration steps:

[0041] S1, preparing an auxiliary modifier;

[0042] S2, adding materials and mixing;

[0043] S3, static maintenance and repair;

[0044] S4, modification and repair inspection;

[0045] S5. Plant experimental planting.

[0046] Based on the above technical solution, in S1, preparing the auxiliary modifier refers to mixing the modifier through a mixing device. During the processing, a certain amount of phosphogypsum and a certain amount of auxiliary modifier are first selected, and then the selected phosphogypsum and auxiliary modifier are added to the mixing equipment for uniform mixing to obtain the auxiliary modifier.

[0047] Based on the above technical solution, the auxiliary modifiers are peat soil, biomass sawdust and humic acid;

[0048] Among them, the usage of phosphogypsum accounts for 10wt% of the total amount, the usage of peat soil in the auxiliary modifier accounts for 11wt% of the total amount, the usage of biomass sawdust in the auxiliary modifier accounts for 3wt% of the total amount, and the usage of humic acid in the auxiliary modifier accounts for 6wt% of the total amount.

[0049] Based on the above technical solution, in S2, the adding and mixing treatment refers to mixing the red mud and the auxiliary modifier obtained after mixing through the same mixing equipment to obtain a red mud mixture. During the adding process of the red mud, the original alkali concentration of the red mud needs to be measured and recorded, and the original alkali concentration of the red mud is recorded as N1;

[0050] After the auxiliary modifier and the red mud are fully mixed by the mixing equipment, the red mud mixture in the mixing equipment is sent to the curing pool. The specification of the curing pool is 1.5m*1.5m*1.5m. When the red mud mixture is filled into the curing pool, it is necessary to fill two-thirds of the red mud mixture in the curing pool. The volume of the red mud mixture after filling is 1m*1m*1m. After the red mud mixture is filled in the curing pool, the surface of the red mud mixture is scraped and leveled. After the red mud mixture is filled, water is evenly poured into the curing pool through a water distribution spray mechanism. The red mud mixture in the curing pool is watered, and the watering time is controlled to be 2min. After the watering is completed, the top of the curing pool is covered, pressed and sealed.

[0051] Based on the above technical solution, in S3, static curing and repairing refers to curing, modifying and repairing the red mud mixture after the red mud mixture is filled into the curing pool;

[0052] During the curing and modification process, the volume of the red mud mixture needs to be calculated. The calculation process is mainly based on the depth of the red mud mixture in the curing tank to calculate the change in the volume of the red mud mixture. When the depth of the red mud mixture after curing changes to Hm, the volume of the red mud mixture after curing is 1m*1m*Hm;

[0053] During the curing and modification of the red mud mixture in the curing tank, precipitate will seep out of the curing tank on the first, second and third days of curing the red mud mixture. After the precipitate seeps out, the precipitate seeping out of the curing tank on the first, second and third days is collected and processed respectively, and on the first, second and third days, the collected precipitate is transported to the precipitate sprayer respectively, and the precipitate collected on the first, second and third days is subjected to liquid distribution treatment by the precipitate sprayer, so that the seeped precipitate is returned to the curing tank after liquid distribution.

[0054] Based on the above technical solution, in S4, the modified restoration test refers to measuring and processing the modified restoration parameters of the red mud mixture in the curing pool when the red mud mixture is cured to the fifth day;

[0055] The measurement and processing specifically include the measurement of the pH value of the red mud mixture, the measurement of the alkali concentration restoration rate of the red mud mixture, and the measurement of microorganisms and organic matter in the red mud mixture.

[0056] Based on the above technical solution, the pH value measurement of the red mud mixture specifically refers to measuring the pH value of the red mud mixture after five days of curing, recording the pH value measurement, and after the pH value measurement, setting the standard pH value to 8. When the pH value of the red mud mixture is less than or equal to 8, it means that the alkali concentration of the red mud mixture meets the requirements of cultivated soil;

[0057] When the pH value of the red mud mixture is measured to be less than or equal to 8, it is necessary to repeatedly test three different positions of the red mud mixture three times. When the three test results are all less than or equal to 8, it means that the red mud mixture can be used normally as arable soil for farming.

[0058] Based on the above technical solution, the measurement of the alkali concentration restoration rate of the red mud mixture specifically refers to the detection of the alkali concentration treatment effect of the red mud mixture after five days of curing. In the measurement process, the alkali concentration of the red mud mixture after five days of curing is first measured, and the alkali concentration of the red mud mixture after curing is recorded as N2, then the alkali concentration restoration rate

[0059] In the above formula: N: alkali concentration repair rate, N1: original alkali concentration of red mud, N2: alkali concentration of red mud mixture after curing treatment.

[0060] Based on the above technical solution, the measurement of microorganisms and organic matter in the red mud mixture specifically refers to the detection of the types and quantities of microorganisms and the content of organic matter in the red mud mixture after five days of curing.

[0061] Based on the above technical solution, in S5, the plant test planting refers to selecting a portion of the red mud mixture in the curing pool for test planting of plants after the red mud mixture is cured in the curing pool for five days and the modified restoration parameters of the red mud mixture are measured, wherein the plant to be planted in the test is ryegrass;

[0062] In the experimental planting process, ryegrass plant seeds are selected, and then 100 ryegrass plant seeds are planted for the test. After planting, watering and maintenance are carried out regularly, and after 28 days of planting, the germination rate and growth state of the ryegrass are observed, and the number of germinated ryegrass is recorded as K, and the survival rate = (K / 100)*100%;

[0063] After measuring the germination rate of the test plants, when the germination rate is greater than 60%, it means that the red mud soil mixture after maintenance can be normally used for plant planting. When the germination rate is lower than 60%, it means that the red mud soil mixture is not conducive to the normal planting of plants. Therefore, when the germination rate is lower than 60%, the red mud soil mixture needs to be re-maintained and repaired.

[0064] Example 2: Figure 1 As shown, the present invention provides a technical solution, a method for in-situ greening of a red mud dump, comprising the following restoration steps:

[0065] S1, preparing an auxiliary modifier;

[0066] S2, adding materials and mixing;

[0067] S3, static maintenance and repair;

[0068] S4, modification and repair inspection;

[0069] S5. Plant experimental planting.

[0070] Based on the above technical solution, in S1, preparing the auxiliary modifier refers to mixing the modifier through a mixing device. During the processing, a certain amount of phosphogypsum and a certain amount of auxiliary modifier are first selected, and then the selected phosphogypsum and auxiliary modifier are added to the mixing equipment for uniform mixing to obtain the auxiliary modifier.

[0071] Based on the above technical solution, the auxiliary modifiers are peat soil, biomass sawdust and humic acid;

[0072] Among them, the usage of phosphogypsum accounts for 10wt% of the total amount, the usage of peat soil in the auxiliary modifier accounts for 11wt% of the total amount, the usage of biomass sawdust in the auxiliary modifier accounts for 3wt% of the total amount, and the usage of humic acid in the auxiliary modifier accounts for 6wt% of the total amount.

[0073] Based on the above technical solution, in S2, the adding and mixing treatment refers to mixing the red mud and the auxiliary modifier obtained after mixing through the same mixing equipment to obtain a red mud mixture. During the adding process of the red mud, the original alkali concentration of the red mud needs to be measured and recorded, and the original alkali concentration of the red mud is recorded as N1;

[0074] After the auxiliary modifier and the red mud are fully mixed by the mixing equipment, the red mud mixture in the mixing equipment is sent to the curing pool. The specification of the curing pool is 1.5m*1.5m*1.5m. When the red mud mixture is filled into the curing pool, it is necessary to fill two-thirds of the red mud mixture in the curing pool. The volume of the red mud mixture after filling is 1m*1m*1m. After the red mud mixture is filled in the curing pool, the surface of the red mud mixture is scraped and leveled. After the red mud mixture is filled, water is evenly poured into the curing pool through a water distribution spray mechanism. The red mud mixture in the curing pool is watered, and the watering time is controlled to be 2min. After the watering is completed, the top of the curing pool is covered, pressed and sealed.

[0075] Based on the above technical solution, in S3, static curing and repairing refers to curing, modifying and repairing the red mud mixture after the red mud mixture is filled into the curing pool;

[0076] During the curing and modification process, the volume of the red mud mixture needs to be calculated. The calculation process is mainly based on the depth of the red mud mixture in the curing tank to calculate the change in the volume of the red mud mixture. When the depth of the red mud mixture after curing changes to Hm, the volume of the red mud mixture after curing is 1m*1m*Hm;

[0077] During the curing and modification of the red mud mixture in the curing tank, precipitate will seep out of the curing tank on the first, second and third days of curing the red mud mixture. After the precipitate seeps out, the precipitate seeping out of the curing tank on the first, second and third days is collected and processed respectively, and on the first, second and third days, the collected precipitate is transported to the precipitate sprayer respectively, and the precipitate collected on the first, second and third days is subjected to liquid distribution treatment by the precipitate sprayer, so that the seeped precipitate is returned to the curing tank after liquid distribution.

[0078] Based on the above technical solution, in S4, the modified restoration test refers to measuring and processing the modified restoration parameters of the red mud mixture in the curing pool when the red mud mixture is cured to the fifth day;

[0079] The measurement and processing specifically include the measurement of the pH value of the red mud mixture, the measurement of the alkali concentration restoration rate of the red mud mixture, and the measurement of microorganisms and organic matter in the red mud mixture.

[0080] Based on the above technical solution, the pH value measurement of the red mud mixture specifically refers to measuring the pH value of the red mud mixture after five days of curing, recording the pH value measurement, and after the pH value measurement, setting the standard pH value to 8. When the pH value of the red mud mixture is greater than 8, it indicates that the alkali concentration of the red mud mixture is high;

[0081] When the pH value of the red mud mixture is greater than 8, the red mud mixture needs to be subjected to pH balance and neutralization treatment. When the pH value is greater than 8, the amount of auxiliary modifier in the red mud mixture needs to be increased. When the red mud mixture is subjected to pH balance treatment by adding the amount of auxiliary modifier, the added auxiliary modifier needs to be mixed and stirred with the original red mud mixture to make the added auxiliary modifier and the original red mud mixture evenly mixed. After the added auxiliary modifier and the original red mud mixture are evenly mixed, the red mud mixture after the balance and neutralization treatment needs to be cured again, and the curing time is three days.

[0082] Based on the above technical solution, the measurement of the alkali concentration restoration rate of the red mud mixture specifically refers to the detection of the alkali concentration treatment effect of the red mud mixture after five days of curing. In the measurement process, the alkali concentration of the red mud mixture after five days of curing is first measured, and the alkali concentration of the red mud mixture after curing is recorded as N2, then the alkali concentration restoration rate

[0083] In the above formula: N: alkali concentration repair rate, N1: original alkali concentration of red mud, N2: alkali concentration of red mud mixture after curing treatment.

[0084] Based on the above technical solution, the measurement of microorganisms and organic matter in the red mud mixture specifically refers to the detection of the types and quantities of microorganisms and the content of organic matter in the red mud mixture after five days of curing.

[0085] Based on the above technical solution, in S5, the plant test planting refers to selecting a portion of the red mud mixture in the curing pool for test planting of plants after the red mud mixture is cured in the curing pool for five days and the modified restoration parameters of the red mud mixture are measured, wherein the plant to be planted in the test is ryegrass;

[0086] In the experimental planting process, ryegrass plant seeds are selected, and then 100 ryegrass plant seeds are planted for the test. After planting, watering and maintenance are carried out regularly, and after 28 days of planting, the germination rate and growth state of the ryegrass are observed, and the number of germinated ryegrass is recorded as K, and the germination rate = (K / 100)*100%;

[0087] After measuring the germination rate of the test plants, when the germination rate is greater than 60%, it means that the red mud soil mixture after maintenance can be normally used for plant planting. When the germination rate is lower than 60%, it means that the red mud soil mixture is not conducive to the normal planting of plants. Therefore, when the germination rate is lower than 60%, the red mud soil mixture needs to be re-maintained and repaired.

[0088] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for in-situ greening of a red mud dump, characterized by: The repair steps include the following: S1, preparing an auxiliary modifier; S2, adding materials and mixing; S3, static maintenance and repair; S4, modification and repair inspection; S5, Plant experimental planting; In S1, preparing the auxiliary modifier means mixing the modifier by a mixing device. During the process, a certain amount of phosphogypsum and a certain amount of auxiliary modifier are first selected, and then the selected phosphogypsum and auxiliary modifier are added to the mixing device for uniform mixing to obtain the auxiliary modifier; The auxiliary modifier is one or more of peat soil, biomass sawdust, straw, peanut shell, rice husk, humic acid, vermiculite and perlite; Among them, the usage of phosphogypsum accounts for 4wt%-15wt% of the total amount, the usage of peat soil in the auxiliary modifier accounts for 5wt%-15wt% of the total amount, the usage of biomass sawdust in the auxiliary modifier accounts for 1wt%-4wt% of the total amount, and the usage of humic acid in the auxiliary modifier accounts for 3wt%-7wt% of the total amount; In S2, the adding and mixing treatment refers to mixing the red mud and the auxiliary modifier obtained after mixing by the same mixing equipment to obtain a red mud mixture. During the adding process of the red mud, the original alkali concentration of the red mud needs to be measured and recorded, and the original alkali concentration of the red mud is recorded as N1; After the auxiliary modifier and the red mud are fully mixed by the mixing equipment, the red mud mixture in the mixing equipment is sent to the curing pool. The specification of the curing pool is 1.5m*1.5m*1.5m. When the red mud mixture is filled into the curing pool, it is necessary to fill two-thirds of the red mud mixture in the curing pool. Then, the volume of the red mud mixture after filling is 1m*1m*1m. After the red mud mixture is filled in the curing pool, the surface of the red mud mixture is scraped and leveled. After the red mud mixture is filled, water is evenly poured into the curing pool through a water distribution sprinkler. The red mud mixture in the curing pool is watered, and the watering time is controlled to be 1-3min. After the watering is completed, the top of the curing pool is covered with a film, pressed, and sealed; In S3, the static curing and repairing refers to curing, modifying and repairing the red mud mixture after the red mud mixture is filled into the curing pool; During the curing and modification process, the volume of the red mud mixture needs to be calculated. The calculation process is mainly based on the depth of the red mud mixture in the curing tank to calculate the change in the volume of the red mud mixture. When the depth of the red mud mixture after curing changes to Hm, the volume of the red mud mixture after curing is 1m*1m*Hm; During the curing and modification of the red mud mixture in the curing tank, on the first, second and third days of curing the red mud mixture, precipitate will seep out of the curing tank. After the precipitate seeps out, the precipitate seeped out of the curing tank on the first, second and third days is collected and processed respectively, and on the first, second and third days, the collected precipitate is transported to a precipitate sprayer respectively, and the precipitate collected on the first, second and third days is subjected to liquid distribution treatment by the precipitate sprayer, so that the precipitate that seeps out is returned to the curing tank after liquid distribution; In S4, the modified restoration test refers to measuring and processing the modified restoration parameters of the red mud mixture in the curing pool when the red mud mixture is cured to the fifth day; The measurement process specifically includes measuring the pH value of the red mud mixture, measuring the alkali concentration restoration rate of the red mud mixture, and measuring the microorganisms and organic matter of the red mud mixture; The pH value measurement of the red mud mixture specifically refers to measuring the pH value of the red mud mixture after five days of curing, recording the pH value measurement, and setting the standard pH value to 8 after the pH value measurement. When the pH value of the red mud mixture is greater than 8, it means that the alkali concentration of the red mud mixture is high. When the pH value of the red mud mixture is less than or equal to 8, it means that the alkali concentration of the red mud mixture meets the requirements of cultivated soil. When the pH value of the red mud mixture is measured to be less than or equal to 8, it is necessary to repeatedly test three different positions of the red mud mixture three times. When the three test results are all less than or equal to 8, it means that the red mud mixture can be normally put into farming as arable soil; When the pH value of the red mud mixture is greater than 8, the red mud mixture needs to be subjected to pH balance and neutralization treatment, the amount of the auxiliary modifier in the red mud mixture needs to be increased, the added auxiliary modifier needs to be mixed and stirred with the original red mud mixture, so that the added auxiliary modifier and the original red mud mixture are evenly mixed, and after the added auxiliary modifier and the original red mud mixture are evenly mixed, the red mud mixture after the balance and neutralization treatment needs to be cured again, and the curing time again is three days; The measurement of the alkali concentration restoration rate of the red mud mixture specifically refers to the detection of the alkali concentration treatment effect of the red mud mixture after five days of curing. In the measurement process, the alkali concentration of the red mud mixture after five days of curing is first measured, and the alkali concentration of the red mud mixture after curing is recorded as N2, then the alkali concentration restoration rate In the above formula: N: alkali concentration repair rate, N1: original alkali concentration of red mud, N2: alkali concentration of red mud mixture after curing treatment; The measurement of microorganisms and organic matter in the red mud soil mixture specifically refers to the detection of the types and quantities of microorganisms and the content of organic matter in the red mud soil mixture after five days of curing; In S5, the plant test planting refers to selecting a portion of the red mud soil mixture in the curing pool for test planting of plants after the red mud soil mixture has been cured in the curing pool for five days and the modified restoration parameters of the red mud soil mixture have been measured, wherein the plant to be planted in the test includes one of ryegrass, tall fescue, alfalfa, Elymus salsa and Bromus inermis; In the process of experimental planting, a plant seed for experimental planting is selected, and then 100 seeds of the plant seed for experimental planting are sown. After planting, watering and maintenance are carried out regularly, and after 28 days of planting, the germination rate and growth state of the experimental planting plant are observed, and the number of germinated experimental planting plants is recorded as K, and the germination rate = (K / 100)*100%; After measuring the germination rate of the test plants, when the germination rate is greater than 60%, it means that the red mud soil mixture after maintenance can be normally used for plant planting. When the germination rate is lower than 60%, it means that the red mud soil mixture is not conducive to the normal planting of plants. Therefore, when the germination rate is lower than 60%, the red mud soil mixture needs to be re-maintained and repaired.

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