CN113817473B - Stabilizing agent for heavy metal contaminated soil remediation, preparation method and application thereof, and remediation method of heavy metal contaminated soil - Google Patents
Stabilizing agent for heavy metal contaminated soil remediation, preparation method and application thereof, and remediation method of heavy metal contaminated soil Download PDFInfo
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- CN113817473B CN113817473B CN202111114654.3A CN202111114654A CN113817473B CN 113817473 B CN113817473 B CN 113817473B CN 202111114654 A CN202111114654 A CN 202111114654A CN 113817473 B CN113817473 B CN 113817473B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of soil remediation, and particularly relates to a preparation method and an application method of a stabilizing agent for heavy metal contaminated soil remediation. The heavy metal stabilizing agent provided by the invention comprises the following components: 50-60 wt% of aluminum oxide, 0-9.0 wt% of silicon dioxide, 0-3 wt% of ferric oxide, 0-0.5 wt% of total amount of sodium oxide and potassium oxide, 33-34 wt% of calcium oxide and the balance of impurities. Compared with the conventional medicament, the stabilizing medicament prepared by compounding the bauxite and the limestone has the advantages of high stabilizing speed, multiple types of stable heavy metals, long stabilizing period and the like, and is an ideal stabilizing material for repairing the polluted soil.
Description
Technical Field
The invention belongs to the technical field of contaminated soil remediation, and particularly relates to a stabilizing agent for heavy metal contaminated soil remediation, a preparation method and an application thereof, and a remediation method of heavy metal contaminated soil.
Background
With the development of industry and the acceleration of urbanization process, the heavy metal pollution of soil is increasingly serious worldwide. Heavy metals are mostly nonferrous metals, are widely applied in the aspects of production and life of human beings, and are accompanied by serious heavy metal pollution; the soil is important confluence of heavy metals in the environment, and the discharged heavy metals finally enter the soil through modes of migration, diffusion and the like, so that the soil pollution is caused.
The stabilization technology is a common heavy metal pollution remediation method at present. At present, inorganic materials such as silicate materials and lime are the most widely used for stabilization of a plurality of stabilizing agents, and the silicate materials are hydrated after being added with water, so that the pH value of a system can be remarkably increased, and heavy metals can be favorably converted into hydroxides or carbonates with low solubility. However, silicate materials generally have a high stabilization rate for heavy metals, and thus have an unsatisfactory long-term stabilization effect. Lime, similar to silicate materials, can also increase the pH of the system, but the cured product of lime is porous, easily leaches heavy metals, and has poor compressive strength and anti-soaking properties, as well as poor long-term stability. Therefore, the development of new stabilizing agents is urgently needed to meet the current needs of heavy metal contaminated soil remediation.
Disclosure of Invention
The invention aims to provide a stabilizing agent for repairing heavy metal contaminated soil, which has better long-term stability and high stabilizing efficiency on various heavy metal elements such as cadmium, chromium, zinc, copper and the like.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a stabilizing agent for repairing heavy metal contaminated soil, which comprises the following components in percentage by mass: 50-60 wt% of aluminum oxide, 0-9.0 wt% of silicon dioxide, 0-3 wt% of ferric oxide, 0-0.5 wt% of total amount of sodium oxide and potassium oxide, 33-34 wt% of calcium oxide and the balance of impurities.
Preferably, the stabilizing agent comprises the following components: 53.8 wt.% of aluminum oxide, 6.2 wt.% of silicon dioxide, 2.6 wt.% of ferric oxide, 0.28 wt.% of total amount of sodium oxide and potassium oxide, 33.4 wt.% of calcium oxide and the balance of impurities.
Preferably, the potassium oxide and the sodium oxide are mixed in any ratio.
The invention provides a preparation method of the stabilizing agent, which comprises the following steps: mixing bauxite with limestone, and calcining at 1400-1500 ℃ for 10-30 min to obtain the stabilizing agent.
Preferably, the mass ratio of the bauxite to the limestone is 1: 1.
the invention also provides the application of the stabilizing agent or the stabilizing agent prepared by the preparation method in repairing heavy metal contaminated soil.
Preferably, the heavy metal contaminated soil comprises one or more of the heavy metals cadmium, chromium, zinc and copper.
The invention also provides a remediation method of heavy metal contaminated soil, which comprises the steps of mixing the stabilizing agent and the heavy metal contaminated soil according to the mass ratio of (1-5) to 100, maintaining the water content of 30-40%, and culturing for 7-180 days.
Preferably, the mass ratio of the stabilizing agent to the heavy metal contaminated soil is 5: 100.
Preferably, the water content is 40%; the culture time is 180 d.
The invention provides a stabilizing agent for repairing heavy metal contaminated soil, which comprises the following components: by mass percent, 50-60 percent of aluminum oxide, 0-9.0 percent of silicon dioxide, 0-3 percent of ferric oxide, 0-0.5 percent of the total amount of sodium oxide and potassium oxide, 33-34 percent of calcium oxide and the balance of impurities. The stabilizing agent formed in the invention has higher setting and hardening speed, shows high efficiency at the early stage of the soil stabilizing process, has strong sulfate corrosion resistance and improves the long-term stability of the agent. And the pH value is increased more than that of silicate in the stabilizing process, so that the production of heavy metal hydroxide or carbonate is facilitated, and the stabilizing efficiency of the heavy metal is improved. The heavy metal stabilizing agent provided by the invention has good long-term stability and high stabilizing efficiency on various heavy metal elements such as cadmium, chromium, zinc, copper and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the present invention will be briefly described below.
FIG. 1 is a SEM of stabilizing agent before and after fixing cadmium in the present invention, wherein A and B are stabilizing agents before fixing; c and D are stabilizing agents after fixing cadmium;
FIG. 2 is an EDS spectrum before and after fixation of cadmium by the stabilizing agent in the present invention, wherein A is the spectrum of the stabilizing agent before fixation and B is the spectrum of the stabilizing agent after fixation of cadmium;
FIG. 3 is AN FTIR spectrum before and after fixation of cadmium by the stabilizing agent of the present invention, wherein AN is the spectrum of the stabilizing agent before fixation, and AN-Cd is the spectrum of the stabilizing agent after fixation of cadmium;
fig. 4 is an XPS spectrum before and after fixing cadmium of the stabilizing agent in the present invention, wherein a is a spectrum of the stabilizing agent before fixing, B is a spectrum of the stabilizing agent after fixing cadmium, and C is a high-resolution narrow spectrum of the Cd3d peak of the stabilizing agent after fixing cadmium.
Detailed Description
The invention provides a stabilizing agent for repairing heavy metal contaminated soil, which comprises the following components in percentage by mass: 50-60 wt% of aluminum oxide, 0-9.0 wt% of silicon dioxide, 0-3 wt% of ferric oxide, 0-0.5 wt% of total amount of sodium oxide and potassium oxide, 33-34 wt% of calcium oxide and the balance of impurities.
In the present invention, the heavy metal stabilizing agent preferably includes the following components: 53.8 wt.% of aluminum oxide, 6.2 wt.% of silicon dioxide, 2.6 wt.% of ferric oxide, 0.28 wt.% of total amount of sodium oxide and potassium oxide, 33.4 wt.% of calcium oxide and the balance of impurities.
The invention provides a preparation method of the stabilizing agent, which comprises the following steps: mixing bauxite with limestone, and calcining at 1400-1500 ℃ for 10-30 min to obtain the stabilizing agent.
In the present invention, the mass ratio of bauxite to limestone is preferably 1: 1. in the invention, the calcining temperature is 1400-1500 ℃, preferably 1450-1500 ℃, and more preferably 1450 ℃. In the invention, the calcination time is 10-30 min, preferably 15-25 min, and more preferably 20 min. In the present invention, the calcination has a fusing effect; the present invention preferably uses coal as a fuel for calcination. The equipment required by calcination in the invention is not particularly limited, and the equipment conventional in the art, such as a rotary kiln, can be adopted. The calcined material prepared by taking the alunite and the limestone as raw materials and combining specific calcination conditions has high fixation efficiency on various heavy metal elements such as cadmium, chromium, zinc, copper and the like, and can realize the stabilization and restoration of the cadmium, chromium, zinc and copper polluted soil.
According to the invention, the block-shaped stabilizing agent prepared by calcination is preferably ground to obtain a powdery stabilizing agent; the powdered stabilizing agent is convenient to mix with the contaminated soil. The particle size of the stabilizing agent powder is not particularly limited in the present invention, and may be any particle size conventionally used in the art. The equipment used for grinding is not particularly limited, and the equipment conventional in the field, such as a ball mill, can be adopted.
The invention provides application of the stabilizing agent in repairing heavy metal contaminated soil. In the present invention, the stabilizing agent is preferably applied to the field-contaminated soil remediation or the field-contaminated soil remediation, and more preferably to the field-contaminated soil remediation.
In the invention, when the stabilizing agent is used for repairing the site-contaminated soil, the weight of the site-contaminated soil is calculated according to the actual site soil contamination depth, and the stabilizing agent is applied according to the mass ratio of the stabilizing agent to the heavy metal-contaminated soil. The calculation method of the contaminated soil in the site is preferably as follows: the contaminated soil weight is the volume of the contaminated soil x the volume weight of the soil, and for example, the contaminated site has a contaminated soil depth of 5m and a contaminated site area of 100m2The soil volume weight is 1.2g/cm3The weight of the polluted soil is 5m multiplied by 100m2×1.2g/cm3。
In the invention, when the stabilizing agent is applied to field polluted soil remediation, after the stabilizing agent is mixed with the heavy metal polluted soil, stirring is preferably further included, and the stirring can enable the agent to be mixed more fully. The stirring mode is not particularly limited in the invention, and the conventional stirring step in the field can be adopted.
In the present invention, the heavy metal contaminated soil preferably includes one or more of heavy metals cadmium, chromium, zinc and copper.
The invention also provides a method for restoring the heavy metal contaminated soil, which comprises the steps of mixing the stabilizing agent and the heavy metal contaminated soil according to the mass ratio of (1-5) to 100, maintaining the water content of 30-40%, and culturing for 7-14 days.
In the invention, the mass ratio of the stabilizing agent to the heavy metal contaminated soil is preferably (3-5): 100, and more preferably 3: 100. In the present invention, the water content is preferably maintained at 30 to 40%, more preferably 40%. In the present invention, the culture time is preferably 7 to 180 days, and more preferably 7 to 14 days or 180 days. Still more preferably 180 d. In the present invention, maintaining the water content has the effect of ensuring that the reaction continues after the agent is mixed into the soil. In the invention, the principle of the stabilizing agent for repairing the heavy metal contaminated soil is that after the stabilizing agent is mixed with the soil, calcium silicate hydrate (C-S-H) and calcium aluminosilicate hydrate (C-A-S-H) gel can be generated through hydration reaction, so that the adsorption of heavy metal ions is realized.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Bauxite and limestone are mixed according to the proportion of 1:1, calcining for 10min at 1400 ℃ in a rotary kiln by taking coal as a fuel to prepare a blocky mixture. By referring to the chemical analysis method of GB/T205-. And grinding the blocky mixture into powder by a ball mill, namely the stabilizing agent.
And uniformly mixing the prepared stabilizing agent with the cadmium heavy metal contaminated soil according to the mass ratio of 1:100, maintaining the water content at 30%, and culturing for 7 d.
Example 2
Bauxite and limestone are mixed according to the proportion of 1:1, using coal as fuel, and calcining the mixture at 1450 ℃ for 20min by adopting a rotary kiln to prepare a blocky mixture, wherein the content of aluminum oxide in the blocky mixture is 53.8 wt.%, the content of silicon dioxide is 6.2 wt.%, the content of ferric oxide is 2.6 wt.%, the total content of sodium oxide and potassium oxide is 0.28 wt.%, the content of calcium oxide is 33.4 wt.%, and the content of impurities is 3.72 wt.%. And grinding the blocky mixture into powder by a ball mill, namely the stabilizing agent.
The stabilizing agent prepared above and the contaminated soil as in example 1 were mixed in a mass ratio of 3:100, and cultured for 7d while maintaining the water content at 30%.
Example 3
Bauxite and limestone are mixed according to the proportion of 1:1, using coal as fuel, and calcining the mixture at 1450 ℃ for 20min by adopting a rotary kiln to prepare a blocky mixture, wherein the content of aluminum oxide in the blocky mixture is 53.8 wt.%, the content of silicon dioxide is 6.2 wt.%, the content of ferric oxide is 2.6 wt.%, the total content of sodium oxide and potassium oxide is 0.28 wt.%, the content of calcium oxide is 33.4 wt.%, and the content of impurities is 3.72 wt.%. And grinding the blocky mixture into powder by a ball mill, namely the stabilizing agent.
The stabilizing agent prepared above and the contaminated soil as in example 1 were mixed in a mass ratio of 5:100, and cultured for 7d while maintaining the water content at 30%.
Comparative example 1
And (3) uniformly mixing the silicate material and the heavy metal contaminated soil with the same source as in the embodiment 1 according to the mass ratio of 1:100, maintaining the water content at 30%, and culturing for 7 d.
Wherein the silicate material comprises 63.9 wt.% CaO, 20.1 wt.% SiO24.1 wt.% Al2O33.61 wt.%Fe2O33.3 wt.% SO31.6 wt.% MgO, 0.5 wt.% K2O, 0.26 wt.% Na2O, 2.63 wt.% impurity.
Comparative example 2
The silicate material as described in comparative example 1 and the heavy metal contaminated soil from the same source as in example 2 were mixed uniformly according to a mass ratio of 3:100, the water content was maintained at 30%, and the mixture was cultured for 7 d.
Comparative example 3
The silicate material as described in comparative example 1 and the heavy metal contaminated soil from the same source as in example 3 were mixed uniformly in a mass ratio of 5:100, the water content was maintained at 30%, and the mixture was cultured for 7 days.
Example 4
The stabilized medicament is prepared according to the preparation method of the example 2, the prepared stabilized medicament and the heavy metal contaminated soil from the same source as the example 2 are uniformly mixed according to the mass ratio of 1:100, the water content is maintained at 40%, and the mixture is cultured for 180 days.
Example 5
The stabilized medicament is prepared according to the preparation method of the example 2, the prepared stabilized medicament and the heavy metal contaminated soil with the same source as the example 2 are uniformly mixed according to the mass ratio of 3:100, the water content is maintained at 40%, and the mixture is cultured for 180 days.
Example 6
The stabilized medicament is prepared according to the preparation method of the example 2, the prepared stabilized medicament and the heavy metal contaminated soil with the same source as the example 2 are uniformly mixed according to the mass ratio of 5:100, the water content is maintained at 40%, and the mixture is cultured for 180 days.
Comparative example 4
The silicate material as described in comparative example 1 and the heavy metal contaminated soil from the same source as in example 2 were mixed uniformly according to a mass ratio of 1:100, the water content was maintained at 40%, and the mixture was cultured for 180 days.
Comparative example 5
The silicate material as described in comparative example 1 and the heavy metal contaminated soil from the same source as in example 2 are mixed uniformly according to the mass ratio of 3:100, the water content is maintained at 40%, and the mixture is cultured for 180 days.
Comparative example 6
The silicate material as described in comparative example 1 and the heavy metal contaminated soil from the same source as in example 2 are mixed uniformly according to the mass ratio of 5:100, the water content is maintained at 40%, and the mixture is cultured for 180 days.
Leaching experiments are respectively carried out according to a solid waste leaching toxicity leaching method horizontal oscillation method (HJ 557-2010) and a solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (HJ/T299-2007), the cadmium ion concentrations in the soil leachate treated in the examples 1-6 and the comparative examples 1-6 are measured, and the types III water standards specified in a groundwater quality standard (GB/T14848-2017) are used as leaching limit values for comparison, and the results are shown in a table 1-2. In practical application, the horizontal oscillation method and the sulfuric acid-nitric acid method are respectively suitable for detecting the leaching toxicity of the solid waste under different environments. For example, the horizontal oscillation method is more suitable for detecting the leaching condition of toxic substances in solid waste subjected to surface water or underground water leaching; the sulfuric acid-nitric acid method is more suitable for detecting the leaching condition of toxic substances in the solid waste under the influence of acidic precipitation.
TABLE 1 test results (mg/L) of concentration of cadmium ion leached from soil in examples 1 to 3 and comparative examples 1 to 3
As can be seen from table 1, the stabilizing agent provided by the present application, when mixed with heavy metal contaminated soil, has a significantly higher stabilizing ability for heavy metals than silicic acid material under the conditions of maintaining a water content of 30% and culturing for 7 days.
TABLE 2 test results (mg/L) of concentration of cadmium ion leached from soil in examples 4 to 6 and comparative examples 4 to 6
| Leaching method | Horizontal oscillation method |
| Contaminated soil | 0.019 |
| Example 4 | 0.008 |
| Example 5 | 0.003 |
| Example 6 | 0.002 |
| Comparative example 4 | 0.009 |
| Comparative example 5 | 0.025 |
| Comparative example 6 | 0.015 |
| Leaching limit | 0.005 |
As can be seen from table 2, after the stabilizing agent provided by the present application is mixed with heavy metal contaminated soil, the fixing ability of the stabilizing agent to heavy metals is significantly higher than that of silicic acid materials under the conditions of maintaining the water content at 40% and culturing for 180 days.
From the above examples and comparative examples, it can be seen that the stabilizing ability of the stabilizing agent provided by the present invention to cadmium in heavy metal contaminated soil is significantly higher than that of silicic acid material under the same conditions, and especially, the determination by the sulfuric acid-nitric acid method shows that the concentration of heavy metal cadmium in the soil leachate treated by the stabilizing agent provided by the present invention is significantly lower than that of heavy metal cadmium in the original contaminated soil.
Test example 1
In order to further illustrate the fixing effect of the stabilizing agent provided by the present invention on cadmium in heavy metal contaminated soil, the present invention respectively performs scanning electron microscope (SEM-EDS), fourier infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) detection on the stabilizing agent obtained in embodiments 1 to 6, the detection results of the stabilizing agent obtained in different embodiments are similar, the detection result of embodiment 3 is taken as an example for illustration, and the detection result of embodiment 3 is shown in fig. 1 to 4.
FIG. 1 shows that the stabilizing agent of the present invention can form an amorphous flocculent gel, which illustrates the ability of the stabilizing agent provided by the present invention to consolidate soil; as can be seen from FIG. 2, the peaks in A represent Ca, Al, Si, O, S, Fe, respectively; the peak values in B respectively represent Ca, Al, Si, O, S, Fe and Cd; shows that Cd is adsorbed on the surface of the stabilizing agent provided by the invention2+(ii) a As can be seen from FIG. 3, the gels generated by the stabilizing agent provided by the present invention are C-S-H and C-A-S-H gels, which illustrate that the stabilizing agent provided by the present invention has the function of adsorbing heavy metal ions, and meanwhile, the stabilizing material shown in FIG. 3 adsorbs Cd2+Then new carbonate precipitate is generated, which indicates that cadmium carbonate is generated. As can be seen from FIG. 4, the presence of cadmium on the surface of the stabilizing agent in the form of cadmium hydroxide, cadmium carbonate or cadmium oxide precipitates means that the stabilizing agent provided by the present invention can also cause a precipitation reaction of heavy metal ions by raising the pH.
According to the test examples, the principle that the stabilizing agent provided by the invention repairs the heavy metal contaminated soil is that the stabilizing agent is mixed with the soil and then can generate calcium silicate hydrate (C-S-H) and calcium aluminosilicate hydrate (C-A-S-H) gel through hydration reaction to realize the adsorption of heavy metal ions; meanwhile, the stabilizing agent provided by the invention can also increase the pH value to ensure that heavy metal ions and OH-The reaction is carried out to generate a precipitate, thereby achieving the purpose of restoring the heavy metal contaminated soil.
Test example 2
Preparing 1mM/L cadmium chloride, chromium chloride, zinc chloride and copper chloride solution for later use.
Mixing the medicament prepared in example 2 with the prepared metal solution in a mass ratio of 1: 100; simultaneously, respectively mixing silicate material/quicklime with the prepared metal solution in a ratio of 1: 100; taking metal solution without stabilizing agent as blank control, oscillating at 20 deg.C at 180r/min for 8 hr, standing, centrifuging at 1800 rpm for 30min, filtering the supernatant with 0.45 μm microporous filter membrane, and measuring the metal ion concentration in the leachate by flame atomic absorption method, as shown in Table 3.
TABLE 3 test results (mg/L) for concentration of metal solution in example 2
| Metal ion | Cd | Cr | Zn | Cu |
| CK | 92.12 | 60.00 | 51.557 | 64.637 |
| Quick lime | 0.40 | 0.024 | 2.830 | 1.418 |
| Silicate material | 0.10 | 0.110 | 0.573 | 0.226 |
| Example 4 | 0.07 | 0.014 | Below the instrument detection limit | Below the instrument detection limit |
As can be seen from table 3, the soil heavy metal stabilizing agent provided in the present invention has the ability to fix heavy metal ions such as cadmium, chromium, zinc, and copper.
From the above examples, it can be seen that the stabilizing ability of the stabilizing agent provided by the present invention for cadmium, chromium, zinc and copper in heavy metal contaminated soil is significantly higher than that of silicate materials, the leaching concentration of cadmium, chromium, zinc and copper in the culture time is lower than the leaching limit value, the requirements of related standards are met, the stabilizing efficiency for various heavy metal elements is very high, and the stabilized effect has long-term stability.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (9)
1. The stabilizing agent for repairing the heavy metal contaminated soil is characterized by comprising the following components in percentage by mass:
50-60 wt% of aluminum oxide, 0-9.0 wt% of silicon dioxide, 0-3 wt% of ferric oxide, 0-0.5 wt% of total amount of sodium oxide and potassium oxide, 33-34 wt% of calcium oxide and the balance of impurities;
the preparation method of the stabilizing agent comprises the following steps: mixing bauxite and limestone, and calcining at 1400-1500 ℃ for 10-30 min to obtain the stabilizing agent.
2. The stabilizing agent according to claim 1, comprising the following components: 53.8 wt.% of aluminum oxide, 6.2 wt.% of silicon dioxide, 2.6 wt.% of ferric oxide, 0.28 wt.% of total amount of sodium oxide and potassium oxide, 33.4 wt.% of calcium oxide and the balance of impurities.
3. The stabilizing agent according to claim 1 or 2, wherein said potassium oxide and sodium oxide are mixed in any ratio.
4. The stabilizing agent according to claim 1, wherein the mass ratio of bauxite to limestone is 1: 1.
5. the use of the stabilizing agent according to any one of claims 1 to 4 for remediating heavy metal contaminated soil.
6. The use according to claim 5, wherein the heavy metal contaminated soil comprises one or more of the heavy metals cadmium, chromium, zinc and copper.
7. A method for remediating heavy metal contaminated soil, characterized by mixing the stabilizing agent according to any one of claims 1 to 4 with heavy metal contaminated soil in a mass ratio of (1 to 5) to 100, maintaining a water content of 30 to 40%, and culturing for 7 to 180 days.
8. The remediation method of claim 7, wherein the mass ratio of the stabilizing agent to heavy metal contaminated soil is 5: 100.
9. Repair method according to claim 7 or 8, characterized in that the water content is 40%; the culture time is 180 d.
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| CN108865160A (en) * | 2018-07-19 | 2018-11-23 | 盐城英贝吉环保科技有限公司 | A kind of middle low-dosage cadmium contaminated soil remediation agent and preparation method |
| CN108822866A (en) * | 2018-07-24 | 2018-11-16 | 江苏天象生物科技有限公司 | A kind of soil heavy metal cadmium passivator and preparation method thereof |
| CN110373201A (en) * | 2019-09-04 | 2019-10-25 | 天津水泥工业设计研究院有限公司 | A kind of fast long-acting soil conditioner and preparation method thereof for repairing farmland cadmium pollution |
| CN112812778A (en) * | 2019-11-18 | 2021-05-18 | 衡阳县湖穗农业有限公司 | Soil passivator for low-cadmium rice planting |
| CN112812777A (en) * | 2019-11-18 | 2021-05-18 | 衡阳县湖穗农业有限公司 | Soil passivator for low-heavy metal rice planting |
| CN112806224A (en) * | 2019-11-18 | 2021-05-18 | 衡阳县湖穗农业有限公司 | Planting method for second crop of low-heavy metal ratoon rice |
| CN112795383A (en) * | 2020-12-17 | 2021-05-14 | 赛恩斯环保股份有限公司 | Multiple heavy metal compound contaminated soil remediation agent and application method thereof |
| CN112779022A (en) * | 2021-01-15 | 2021-05-11 | 清华大学 | Heavy metal contaminated soil remediation agent and preparation method and application thereof |
| CN113150787A (en) * | 2021-03-24 | 2021-07-23 | 河南农业大学 | Silicon-calcium-magnesium fertilizer soil conditioner and preparation method and application thereof |
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