Soil conditioner for improving secondary aluminum ash and preparation method of soil conditioner

Abstract

The invention discloses a soil improvement regulator, which is prepared from the following raw materials in parts by weight: 10 to 50 parts of secondary aluminum ash residue subjected to innocent treatment, 5 to 10 parts of tea bran, 1 to 2 parts of complex microbial inoculants, 2 to 6 parts of magnetized seaweed mud, 10 to 20 parts of charcoal, 5 to 10 parts of bagasse and 5 to 10 parts of hydrolyzed amino acid, the complex microbial inoculants comprise bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-enriched strains. According to the soil improvement conditioning agent, high nutrient elements in the secondary aluminum ash residues are reserved, harmful elements are removed, the magnetized seaweed mud and the complex microbial inoculants are added, through the synergistic effect of the multiple elements, the soil improvement conditioning agent has the good soil improvement effect, and reutilization of the secondary aluminum ash residues is achieved. The invention further discloses a preparation method of the soil improvement regulator.

Description

Technical Field

[0001] The invention relates to the technical field of soil improvement, and in particular to a secondary aluminum ash slag improved soil conditioner and a preparation method thereof. Background Art

[0002] Secondary aluminum ash is the waste after the extraction of metallic aluminum from primary aluminum ash or the aluminum-containing waste slag produced during the aluminum refining process. It is black in color and is also called black ash. Its main components are aluminum oxide and aluminum nitride, and it contains a small amount of metallic aluminum and salts, etc. It also contains toxic and harmful substances such as fluoride salts, chlorides and other heavy metal oxides. The aluminum nitride contained in the aluminum ash has a high reactivity. When it comes into contact with water or humid air, it is very easy to undergo hydrolysis to generate aluminum hydroxide and toxic and harmful ammonia, thereby causing air pollution. In addition, aluminum ash contains fluorides and chlorides. Long-term accumulation will cause serious pollution to the soil and groundwater, affecting the life safety of the residents in the stacking area and the surrounding areas.

[0003] At present, soil conditioners are mainly composed of agricultural water retaining agents and natural peat or other organic matter rich in organic matter and humic acid, supplemented by biologically active ingredients and nutrients. Soil conditioners can be divided into: soil binders that agglomerate and disperse soil particles and improve soil structure; soil stabilizers that fix topsoil and prevent soil erosion; soil acidifiers that adjust soil pH; soil warming agents that can increase soil temperature; soil water retaining agents that can retain soil moisture, etc. Water-retaining soil conditioners are divided into liquid water retaining agents and solid water retaining agents, among which solid water retaining agents include starch series, blends and composite series, proteins, synthetic resin series, cellulose series, etc.

[0004] At present, there are few studies and applications on secondary aluminum ash slag as a soil conditioner. Although secondary aluminum ash contains harmful components, it is also rich in various nutrients required for plant growth. Therefore, how to convert secondary aluminum ash slag into a safe and efficient soil conditioner and apply it to plant growth, turning waste into treasure, and realizing ecological environment construction, ecological environment governance, ecological environment restoration, and green and sustainable development is a future development goal. To this end, the present invention proposes a secondary aluminum ash slag soil conditioner. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, one of the purposes of the present invention is to provide a secondary aluminum ash slag improved soil conditioner to solve the problem of recycling secondary aluminum ash slag. The second purpose of the present invention is to provide a preparation method of the secondary aluminum ash slag improved soil conditioner.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A secondary aluminum ash improved soil conditioner comprises the following raw materials in parts by weight: 10-50 parts of harmlessly treated secondary aluminum ash, 5-10 parts of tea bran, 1-2 parts of composite bacterial agent, 2-6 parts of magnetized seaweed mud, 10-20 parts of biochar, 5-10 parts of bagasse, and 5-10 parts of hydrolyzed amino acids, wherein the composite bacterial agent comprises Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-enriched bacteria.

[0008] As a preferred embodiment of the present invention, the regulator includes the following raw materials in parts by weight: 35 parts of secondary aluminum ash slag after harmless treatment, 8 parts of tea bran, 1.2 parts of composite bacterial agent, 4 parts of magnetized seaweed mud, 15 parts of biochar, 6 parts of sugarcane bagasse, and 8 parts of hydrolyzed amino acids.

[0009] As a preferred embodiment of the present invention, the weight ratio of Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-enriched bacteria is 0.5-1.5:1.5-2.5:0.5-1.5:0.25-0.75:0.25-0.75.

[0010] As a preferred embodiment of the present invention, the weight ratio of the Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria, and selenium-enriched bacteria is 1:2:1:0.5:0.5.

[0011] The present invention also discloses a method for preparing a secondary aluminum ash slag improved soil conditioner according to the technical solution, comprising the following steps:

[0012] S1. Grind bagasse and tea bran, then add composite bacterial agent and water and stir evenly, and ferment at room temperature for 1-2 days to obtain mixture A;

[0013] S2, mixing and crushing the harmlessly treated secondary aluminum ash, magnetized seaweed mud and biochar, and then passing through a 100-mesh sieve, and then adding water and hydrolyzed amino acids, and stirring evenly to obtain a mixture B;

[0014] S3. Mix the mixture A and the mixture B, and adjust the pH to 6.8-7.2 to obtain an improved soil conditioner.

[0015] As a preferred embodiment of the present invention, the magnetized seaweed mud is prepared by the following method: after grinding the seaweed mud with water, adding iron powder with a weight ratio of iron powder to seaweed mud of 1:20-120 and continuing to grind for 20-30 minutes, placing it in an electromagnetic field for 30-60 minutes after grinding, and the magnetic field strength is 2000-10000GS to obtain the magnetized seaweed mud, wherein the iron powder used is iron oxide.

[0016] As a preferred embodiment of the present invention, the harmless treatment of secondary aluminum ash slag includes the following steps: after the secondary aluminum ash slag is treated with acid leaching, it is filtered, the filter residue is washed with water for 2-4 times in a cycle, and then a hydrolyzed amino acid is added in a weight ratio of 0.1-1:10 to the secondary aluminum ash slag, and the mixture is stirred for 1-2 hours. After the stirring is completed, the mixture is allowed to stand for 20-30 minutes, and the upper suspension is removed to obtain the treated secondary aluminum ash slag.

[0017] As a preferred embodiment of the present invention, the selenium-enriched bacteria are prepared by the following method: yeast, selenium standard solution and sterile water are mixed in a weight ratio of 1:0.01-0.2:50-100, and then cultured to obtain the selenium-enriched bacteria.

[0018] As a preferred embodiment of the present invention, the weight ratio of iron oxide to seaweed mud is 1:100.

[0019] As a preferred embodiment of the present invention, the weight ratio of the hydrolyzed amino acid to the secondary aluminum ash is 0.2:10.

[0020] Beneficial effects of the present invention:

[0021] The soil conditioner of the present invention uses secondary aluminum ash as raw material, and retains the high nutritional elements therein through harmless treatment. The treated secondary aluminum ash is combined with magnetized seaweed mud and biochar to further lock these nutrients and avoid nutrient loss. At the same time, multiple beneficial microorganisms are introduced for synergistic effect to ensure that the high nutritional elements can be fully absorbed by plants and improve the effective utilization of resources.

[0022] The harmless treatment of secondary aluminum ash slag can extract and recover most of the aluminum through acid leaching treatment, so as to achieve the recycling of aluminum resources. Subsequently, through cyclic washing, most of the salts in the secondary aluminum ash slag, such as fluoride salts and other harmful substances, can be removed. Then, the heavy metal elements in the secondary aluminum ash slag are chelated by hydrolyzing amino acids to form stable chelates. After standing, the upper suspension is removed, which can effectively remove the heavy metal elements in the secondary aluminum ash slag and make the secondary aluminum ash slag harmless.

[0023] The harmlessly treated secondary aluminum ash is combined with magnetized seaweed mud and biochar. In addition to containing a large amount of natural sodium and potassium elements, which can provide nutrients for plant growth and have the advantages of good absorbency and strong air permeability, the seaweed mud has unique physical properties through magnetization. It has strong adsorption and can effectively adsorb and fix the nutrients in the secondary aluminum ash, thereby effectively locking the high-nutrient elements in the secondary aluminum ash and the nutrients in the soil, ensuring that these nutrients can be supplied to plants in a long-term and stable manner, while also achieving the effect of water retention. Biochar also has good adsorption, and can further lock nutrients on the basis of magnetized seaweed mud to improve the effect.

[0024] Adding hydrolyzed amino acids, which have strong chelating effects, can combine with heavy metals (such as lead, cadmium, mercury, etc.) in the soil to form stable, macromolecular complexes, which are not easily absorbed by plant roots, thus reducing the pollution of heavy metals to plants. At the same time, hydrolyzed amino acids can also promote the activity of microorganisms and further enhance the synergistic effect of microorganisms, which can not only promote the absorption of nutrients by plants, but also use their biological properties to improve the self-repairing ability of the soil.

[0025] Bagasse and tea bran are cultivated together with compound bacterial agents, and a variety of beneficial microorganisms cultivated from multiple strains are introduced. The synergistic effect of these microorganisms not only helps to cement soil particles, making the soil more loose, improving air permeability and water retention, but also works together with long-term locked nutrients to further promote the effective absorption of nutrients in secondary aluminum ash by plants, thereby maximizing nutrient utilization. In addition, the decomposition of bagasse and tea bran will also increase the nutrients and optimize the fertility of the regulator.

[0026] The soil conditioner of the present invention cleverly combines secondary aluminum ash with magnetized seaweed mud and combines the synergistic effect of microorganisms, which can not only optimize the soil structure, increase the air permeability and water retention of the soil, but also has the effect of long-term fertility, which helps to reduce the use of chemical fertilizers, reduce agricultural production costs, and achieve green and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a preparation flow chart of an embodiment of the present invention;

[0028] Figure 2 It is a sample diagram during the application effect test of the present invention. DETAILED DESCRIPTION

[0029] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0030] Example 1

[0031] The present embodiment discloses a secondary aluminum ash slag improved soil conditioner, comprising the following raw materials in parts by weight: 35 parts of harmlessly treated secondary aluminum ash slag, 8 parts of tea bran, 1.2 parts of composite bacterial agent, 4 parts of magnetized seaweed mud, 15 parts of biochar, 6 parts of sugarcane bagasse, and 8 parts of hydrolyzed amino acids.

[0032] This embodiment also discloses a method for preparing a secondary aluminum ash slag improved soil conditioner, see Figure 1 As shown, the following steps are included:

[0033] S1. Grind bagasse and tea bran, then add equal amounts of composite bacterial agent and water and stir evenly, and ferment at room temperature for 1-2 days to obtain a mixture A.

[0034] S2, the harmlessly treated secondary aluminum ash, magnetized seaweed mud and biochar are mixed and crushed, and then passed through a 100-mesh sieve, and then water of equal weight to the above three mixtures is added, and then hydrolyzed amino acids are added, and after uniform stirring, a mixture B is obtained;

[0035] S3. Mix the mixture A and the mixture B, and adjust the pH to 6.8-7.2 to obtain an improved soil conditioner.

[0036] In step S1, the composite bacterial agent includes Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-rich bacteria. The above bacteria are dried, crushed and mixed to obtain a composite bacterial agent for use. The weight ratio of Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-rich bacteria after drying is 1:2:1:0.5:0.5.

[0037] The selenium-enriched bacterial strain is prepared by the following method: yeast, selenium standard solution and sterile water are mixed in a weight ratio of 1:0.01:50, and then cultured to obtain the selenium-enriched bacterial strain.

[0038] In step S2, the harmless treated secondary aluminum ash is prepared by the following method: sulfuric acid is added to the secondary aluminum ash for acid leaching, and after the acid leaching, it is filtered to obtain aluminum sulfate (Al2(SO4)3) solution and filter residue. The chemical reactions involved in the acid leaching process are as follows:

[0039] 2Al2O3+3H2SO4=Al2(SO4)3+3H2O

[0040] The filter residue is washed with water for 2-4 times to remove most of the salts in the secondary aluminum ash, such as fluoride salts and other harmful substances. Then, hydrolyzed amino acids are added and stirred for 1-2 hours. The weight ratio of hydrolyzed amino acids to secondary aluminum ash is 0.2:10. After stirring, it is allowed to stand for 20-30 minutes. The hydrolyzed amino acids chelate the heavy metal elements therein to form a stable chelate suspended in the upper layer. The upper suspension is removed to obtain the treated secondary aluminum ash for use.

[0041] The magnetized seaweed mud is prepared by the following method: grinding the seaweed mud with water, adding iron powder with a weight ratio of iron oxide powder to seaweed mud of 1:20, and continuing to grind for 20-30 minutes. After grinding, placing it in an electromagnetic field for 30-60 minutes with a magnetic field strength of 2000-10000GS to obtain the magnetized seaweed mud.

[0042] Example 2

[0043] The present embodiment discloses a secondary aluminum ash slag improved soil conditioner, comprising the following raw materials in parts by weight: 10 parts of harmlessly treated secondary aluminum ash slag, 5 parts of tea bran, 1 part of composite bacterial agent, 2 parts of magnetized seaweed mud, 10 parts of biochar, 5 parts of sugarcane bagasse, and 5 parts of hydrolyzed amino acids.

[0044] This embodiment also discloses a method for preparing a secondary aluminum ash slag improved soil conditioner, comprising the following steps:

[0045] S1. Grind bagasse and tea bran, then add equal amounts of composite bacterial agent and water and stir evenly, and ferment at room temperature for 1-2 days to obtain a mixture A.

[0046] S2, the harmlessly treated secondary aluminum ash, magnetized seaweed mud and biochar are mixed and crushed, and then passed through a 100-mesh sieve, and then water of equal weight to the above three mixtures is added, and then hydrolyzed amino acids are added, and after uniform stirring, a mixture B is obtained;

[0047] S3. Mix the mixture A and the mixture B, and adjust the pH to 6.8-7.2 to obtain an improved soil conditioner.

[0048] In step S1, the composite bacterial agent includes Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-rich bacteria. The above bacteria are dried, crushed and mixed to obtain a composite bacterial agent for use. The weight ratio of Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-rich bacteria after drying is 0.5:1.5:0.5:0.25:0.25.

[0049] The selenium-rich bacterial strain is prepared by the following method: yeast, selenium standard solution and sterile water are mixed in a weight ratio of 1:0.1:70, and then cultured to obtain the selenium-rich bacterial strain.

[0050] In step S2, the harmlessly treated secondary aluminum ash slag is prepared by the following method: sulfuric acid is added to the secondary aluminum ash slag for acid leaching treatment, and the filter is filtered after the acid leaching treatment, and the filter residue is washed with water for 2-4 times in a cycle, and then hydrolyzed amino acids are added and stirred for 1-2 hours. After the stirring is completed, the mixture is allowed to stand for 20-30 minutes, and the upper suspension is removed to obtain the treated secondary aluminum ash slag for later use.

[0051] The magnetized seaweed mud is prepared by the following method: grinding the seaweed mud with water, adding iron powder with a weight ratio of iron oxide powder to seaweed mud of 1:100, and continuing grinding for 20-30 minutes; after grinding, placing it in an electromagnetic field for 30-60 minutes, and the magnetic field strength is 2000-10000GS to obtain the magnetized seaweed mud.

[0052] Example 3

[0053] The present embodiment discloses a secondary aluminum ash slag improved soil conditioner, comprising the following raw materials in parts by weight: 50 parts of harmlessly treated secondary aluminum ash slag, 10 parts of tea bran, 2 parts of composite bacterial agent, 6 parts of magnetized seaweed mud, 20 parts of biochar, 10 parts of sugarcane bagasse, and 10 parts of hydrolyzed amino acids.

[0054] This embodiment also discloses a method for preparing a secondary aluminum ash slag improved soil conditioner, comprising the following steps:

[0055] S1. Grind bagasse and tea bran, then add equal amounts of composite bacterial agent and water and stir evenly, and ferment at room temperature for 1-2 days to obtain a mixture A.

[0056] S2, the harmlessly treated secondary aluminum ash, magnetized seaweed mud and biochar are mixed and crushed, and then passed through a 100-mesh sieve, and then water of equal weight to the above three mixtures is added, and then hydrolyzed amino acids are added, and after uniform stirring, a mixture B is obtained;

[0057] S3. Mix the mixture A and the mixture B, and adjust the pH to 6.8-7.2 to obtain an improved soil conditioner.

[0058] In step S1, the composite bacterial agent includes Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-rich bacteria. The above bacteria are dried, crushed and mixed to obtain a composite bacterial agent for use. The weight ratio of Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-rich bacteria after drying is 1.5:2.5:1.5:0.75:0.75.

[0059] The selenium-enriched bacterial strain is prepared by the following method: yeast, selenium standard solution and sterile water are mixed in a weight ratio of 1:0.2:100, and then cultured to obtain the selenium-enriched bacterial strain.

[0060] In step S2, the harmlessly treated secondary aluminum ash slag is prepared by the following method: sulfuric acid is added to the secondary aluminum ash slag for acid leaching treatment, and the filter is filtered after the acid leaching treatment, and the filter residue is washed with water for 2-4 times in a cycle, and then hydrolyzed amino acids are added and stirred for 1-2 hours. After the stirring is completed, the mixture is allowed to stand for 20-30 minutes, and the upper suspension is removed to obtain the treated secondary aluminum ash slag for later use.

[0061] The magnetized seaweed mud is prepared by the following method: after grinding the seaweed mud with water, adding iron powder with a weight ratio of iron oxide powder to seaweed mud of 1:120 and continuing grinding for 20-30 minutes, placing it in an electromagnetic field for 30-60 minutes after grinding, and the magnetic field strength is 2000-10000GS to obtain the magnetized seaweed mud.

[0062] Effect of harmless treatment of secondary aluminum ash

[0063] The harmless treatment method of Example 2 was used to treat the secondary aluminum ash slag. The following are the test results of various substances in the secondary aluminum ash slag before and after treatment, as shown in the following table. Among them, Table 1 is the test results of harmful substances and pH values ​​before and after treatment, and Table 2 is the test results of effective nutrient elements after treatment.

[0064] Table 1

[0065]

[0066] Table 2

[0067]

[0068] It can be seen from Tables 1 and 2 that after the secondary aluminum ash slag is treated by the method of the present invention, it can be seen that the contents of heavy metal elements (cadmium, lead, arsenic, chromium) and harmful substances (aluminum nitride, aluminum carbide) are significantly reduced. At the same time, the nutritional elements in the secondary aluminum ash slag are retained to the greatest extent and applied to the soil to improve fertility and realize the reuse of the secondary aluminum ash slag.

[0069] Experiment on the application effect of soil conditioner

[0070] Comparative Example 1: The difference from Example 2 is that no magnetized seaweed mud is added to the soil conditioner.

[0071] Comparative Example 2: The difference from Example 2 is that non-magnetized seaweed mud (general diatom mud) is added to the soil conditioner.

[0072] Take 4 portions of 10 kg soil, take 3 portions of the 4 portions of soil, add 1 kg of soil conditioner of Comparative Example 1, Comparative Example 2, and Example 2 respectively, and mix evenly. The remaining 1 portion is used as a blank group, and no soil conditioner is added. The 4 portions of soil are placed in a water-tight flower pot, and two layers of filter cloth that can filter water are placed at the bottom of the flower pot. Water is irrigated 3 times a day. After 2 consecutive months, the nutrient components of the soil are tested, and the test results are shown in Table 3. Figure 2 From left to right in the figure are comparative example 1, a mixed sample of comparative example 2 and soil, and a blank soil sample of the blank group.

[0073] Table 3

[0074]

[0075] As shown in Table 3, the nutrients and moisture of the soil in Comparative Examples 1 and 2, as well as the blank group, have decreased significantly, while the soil nutrient cost and moisture loss in Example 2 are less. This is because the magnetized seaweed mud in the conditioner adsorbs and locks the nutrients and moisture in the secondary aluminum ash, thus reducing the loss of nutrients. The blank group loses nutrients faster than Comparative Examples 1 and 2, which indicates that other components in the conditioner also have a certain locking effect on nutrients and moisture.

[0076] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A secondary aluminum ash slag improved soil conditioner, characterized in that: The invention comprises the following raw materials in parts by weight: 10-50 parts of harmlessly treated secondary aluminum ash residue, 5-10 parts of tea bran, 1-2 parts of composite bacterial agent, 2-6 parts of magnetized seaweed mud, 10-20 parts of biochar, 5-10 parts of bagasse, and 5-10 parts of hydrolyzed amino acids, wherein the composite bacterial agent comprises Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-enriched bacteria.

2. The regulator according to claim 1, characterized in that: The regulator comprises the following raw materials in parts by weight: 35 parts of harmlessly treated secondary aluminum ash, 8 parts of tea bran, 1.2 parts of composite bacterial agent, 4 parts of magnetized seaweed mud, 15 parts of biochar, 6 parts of sugarcane bagasse, and 8 parts of hydrolyzed amino acids.

3. The regulator according to claim 1, characterized in that: The weight ratio of the Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-enriched bacteria is 0.5-1.5: 1.5-2.5: 0.5-1.5: 0.25-0.75: 0.25-0.

75.

4. The regulator according to claim 3, characterized in that: The weight ratio of the Bacillus subtilis, nitrogen-fixing bacteria, photosynthetic bacteria, nitrifying bacteria and selenium-enriched bacteria is 1:2:1:0.5:0.

5.

5. A method for preparing a secondary aluminum ash slag improved soil conditioner, characterized in that: The following steps are involved: S1. Grind bagasse and tea bran, then add composite bacterial agent and water and stir evenly, and ferment at room temperature for 1-2 days to obtain mixture A; S2, mixing and crushing the harmlessly treated secondary aluminum ash, magnetized seaweed mud and biochar, and then passing through a 100-mesh sieve, and then adding water and hydrolyzed amino acids, and stirring evenly to obtain a mixture B; S3. Mix the mixture A and the mixture B, and adjust the pH to 6.8-7.2 to obtain an improved soil conditioner.

6. The preparation method according to claim 5, characterized in that: The magnetized seaweed mud is prepared by the following method: grinding the seaweed mud with water, adding iron powder with a weight ratio of iron powder to seaweed mud of 1:20-120, and continuing grinding for 20-30 minutes; placing the seaweed mud in an electromagnetic field for 30-60 minutes after grinding, and the magnetic field strength is 2000-10000GS to obtain the magnetized seaweed mud, wherein the iron powder used is iron oxide.

7. The regulator according to claim 5, characterized in that: The harmless treatment of the secondary aluminum ash slag comprises the following steps: after the secondary aluminum ash slag is treated by acid leaching, it is filtered, the filter residue is washed with water for 2-4 times in a cycle, and then hydrolyzed amino acids are added in a weight ratio of 0.1-1:10 to the secondary aluminum ash slag, and stirred for 1-2 hours. After the stirring is completed, it is allowed to stand for 20-30 minutes, and the upper suspension is removed to obtain the treated secondary aluminum ash slag.

8. The regulator according to claim 5, characterized in that: The selenium-enriched bacterial strain is prepared by the following method: yeast, selenium standard solution and sterile water are mixed in a weight ratio of 1:0.01-0.2:50-100, and then cultured to obtain the selenium-enriched bacterial strain.

9. The preparation method according to claim 6, characterized in that: The weight ratio of the iron oxide to the seaweed mud is 1:

100.

10. The preparation method according to claim 7, characterized in that: The weight ratio of the hydrolyzed amino acid to the secondary aluminum ash slag is 0.2:10.

Images