CN113857227B - Method for restoring heavy metal cadmium farmland soil by using stabilized restoring material - Google Patents
Method for restoring heavy metal cadmium farmland soil by using stabilized restoring material Download PDFInfo
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Abstract
The invention relates to the technical field of heavy metal soil remediation, and discloses a method for remediating heavy metal cadmium farmland soil by using a stabilizing remediation material; the method comprises the following steps: firstly, primarily screening and crushing restored soil; mixing and stirring the biochar, calcium carbonate and sodium sulfide, and heating to obtain a mixture; then mixing the mixture with iron oxide, carrying out magnetization grinding treatment, and heating in a water bath to obtain a first repair material; mixing calcium oxide, monopotassium phosphate and an adhesive, and heating and stirring to obtain a second repair material; firstly, conveying the soil obtained by crushing into a stirrer, adding regulating water to control the water content of the soil, and then adding a first repairing material and a second repairing material for repairing; the invention can improve the capability of the biochar for continuously stabilizing and repairing in the soil with large temperature difference, promote the heavy metal cadmium to be effectively fixed and reduce the bioavailability of the heavy metal cadmium.
Description
Technical Field
The invention relates to the technical field of heavy metal soil remediation, in particular to a method for remediating heavy metal cadmium farmland soil by using a stabilized remediation material.
Background
With the continuous development of the industry, the heavy metal pollution degree of the soil is more and more serious; in the total overproof rate of soil in China, the overproof rate of cadmium and lead is more prominent, and the cadmium and lead is a key object for soil treatment. Because cadmium has high activity and strong mobility, cadmium is easy to be enriched in plants through plant roots, and has serious influence on the areas where the main pillar industry is agriculture.
Biochar is a soil conditioner with low cost and wide application, and in the prior art, the biochar is generally used as a core to design a relatively ideal stabilizing and repairing material; most of stabilized repair materials in the current research are not considered for the actual situation that the temperature difference is large in the north winter, so that the treatment effect of the repair materials which are good in the experiment in the soil with large temperature difference in the north is greatly reduced, and the reason is that the soil can be repeatedly thawed in winter, the temperature difference of the soil is large, and cadmium in different forms can be greatly changed in the process of repeatedly thawing the soil; therefore, in the stabilizing and repairing process of the biochar, the cadmium is promoted to be converted into an effective state by repeated thawing of the soil, and the ecological risk is increased.
Disclosure of Invention
The technical problem solved by the invention is as follows: the capability of the biochar for stabilizing and repairing in the soil with large temperature difference is improved, the heavy metal cadmium is promoted to be effectively fixed, and the bioavailability of the heavy metal cadmium is reduced.
The technical scheme of the invention is as follows: a method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material comprises the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired;
s2: preparing the first repair material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 3-7: 2-5: 2-3, heating for 3-8 hours at 85-125 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to a mass ratio of 2-4: 1, mixing, carrying out magnetization grinding treatment for 20-30 min, heating in water bath at 80-95 ℃ for 60-120 min, and continuously stirring to obtain a first repair material;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate according to the mass ratio of 2-3: 1, continuously stirring, adding an adhesive, heating at 60-95 ℃ for 30-60 min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 10-16% of the mass of the monopotassium phosphate;
s4: soil remediation
Firstly, feeding the soil obtained by crushing in the step S1 into a stirrer, adding regulating water to control the water content of the soil to be within the range of 60-65%, then adding a first repairing material, and fully stirring;
wherein, the first repairing material accounts for 0.5 to 3 percent of the mass ratio of the soil; ventilating at normal temperature for 28-38 days, and adding a second repair material; fully stirring again, and ventilating and placing for 30-60 days at normal temperature; wherein the second repairing material accounts for 0.5-2% of the soil mass ratio.
Further, in the step S2, the particle size of the biochar is 0.5-1.2 mm, the particle size of the calcium carbonate is 120-200 nm, the particle size of the sodium sulfide is 50-80 nm, and the particle size of the ferric oxide is 30-60 nm. The charcoal powder with the particle size can carry out efficient and firm loading on modified powder such as ferric oxide, calcium carbonate, sodium sulfide and the like, and ensure that the metal cadmium in the soil is continuously and efficiently repaired.
The particle size of the biochar is 0.5-1.2 mm, so that the nano powder of calcium carbonate, sodium sulfide and ferric oxide can be carried efficiently, and the modification of the biochar is realized; because the percentage of the four cadmium contents is in turn from large to small after the biological carbon is stably adsorbed in the heavy metal polluted soil, the reducible cadmium, the weak acid extraction cadmium, the oxidizable cadmium and the residue are in turn; the fixation effect on cadmium can be enhanced under the action of calcium carbonate, sodium sulfide and ferric oxide, the bioavailability of cadmium is reduced, and the absorption and accumulation of cadmium by plants are reduced.
Further, modifying the first repair material obtained in step S2;
mixing the first repairing material, calcium superphosphate and calcium oxide according to the mass ratio of 1:3:2, heating in a water bath at the temperature of 80-95 ℃ for 3-6 hours, and continuously stirring. The calcium superphosphate and the calcium oxide can modify the first repairing material, and the repairing stability of the first repairing material can be enhanced on one hand through the calcium superphosphate and the calcium oxide, so that the soil can be repaired for a long time by the first repairing material; on the other hand, the heavy metal soil can be solidified and stabilized, and the heavy metal in the soil can be removed more easily after treatment.
Further, the adhesive in the step S3 is obtained by mixing magnesium slag and silicate according to the mass ratio of 1-3: 1, adding water, and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 15 to 35 percent. The hydration product of the magnesium slag and the silicate can effectively promote the para-position substitution of cadmium and calcium on the biochar, enhance the fixation capacity of cadmium and greatly reduce the leaching amount of cadmium.
Further, the silicate is any one or any combination of more than two of feldspar powder, albite powder, kaolinite powder, calcium feldspar powder and talcum powder. The silicate powder can be fully mixed with the magnesium slag to improve the dispersion degree of hydration products, promote the heavy metal cadmium to be efficiently fixed and further reduce the bioavailability of the heavy metal cadmium.
Further, in the step S3, the particle sizes of the calcium oxide and the monopotassium phosphate are both 20-80 μm; by mixing the micron-sized calcium oxide, the potassium dihydrogen phosphate and the adhesive, the uniform discreteness of hydration products can be further effectively improved, the high-efficiency treatment of heavy metal wastewater is facilitated, and the treatment quality of heavy metal cadmium can be improved.
Further, in step S2, mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 5:3:2, heating for 4 hours at 96 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to the mass ratio of 3:1, carrying out magnetization grinding treatment for 25min, then heating in a water bath at 85 ℃ for 90min, and continuously stirring to obtain the first repairing material. Wherein the calcium carbonate is alkaline, which can improve the pH value of the soil, and the ferric oxide can generate a connection with cadmium on the surface of the biochar, thereby increasing the fixing capacity of the biochar to the cadmium.
Further, in step S4, the soil obtained in step S1 is sent into a mixer, adjusting water is added to control the water content of the soil to be within a range of 60-65%, and then the first repairing material and the second repairing material are added together and mixed uniformly; ventilating at normal temperature for 50-60 days. Wherein the first repairing material accounts for 1.5 percent of the mass ratio of the soil; the second repairing material accounts for 1% of the soil mass ratio. Through mixing first repair material, second repair material with the soil that needs to handle simultaneously, can guarantee to reduce the time of continuous processing under the better treatment quality circumstances, be favorable to improving the operating efficiency to metal cadmium handles in the soil, reinforcing practicality.
Further, the biochar in the step S2 is any one or any combination of straw biochar, straw biochar and wood chip biochar. The charcoal can increase the air permeability of the soil, provide a proper environment for soil microorganisms, and further change the physical and chemical properties of the soil; the solubility of heavy metal in soil is reduced through the adsorption effect by the large specific surface area of the biochar, and the effective fixation of heavy metal cadmium is realized.
The invention has the beneficial effects that: the stabilizing repair material provided by the invention can effectively improve the stabilizing repair capability of the biochar in the soil with large temperature difference, promote the heavy metal cadmium to be effectively fixed and reduce the bioavailability of the heavy metal cadmium; according to the invention, cadmium chelate is formed on the biochar through calcium carbonate, sodium sulfide and iron oxide nano materials, so that the simple adsorption capacity of the biochar is compensated, the bioavailability of cadmium can be reduced no matter how the form of heavy metal cadmium in soil changes, and the leaching amount of cadmium is greatly reduced by improving the pH value of the soil. According to the invention, the second repairing material can make the soil structure compact, the soil void volume reduced, the mechanical property improved and the heavy metal cadmium immersion reduced; the hydration product of the magnesium slag and the silicate can effectively promote the para-position substitution of cadmium and calcium on the biochar, enhance the fixation capacity of cadmium and greatly reduce the leaching amount of cadmium.
Detailed Description
Example 1:
a method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material comprises the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, wherein the particle size of the soil is 2 mm;
s2: preparing the first repair material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 3:2:2, heating for 3 hours at 85 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to the mass ratio of 2:1, mixing, carrying out magnetization grinding treatment for 20min, heating in a water bath at 80 ℃ for 60min, and continuously stirring to obtain a first repair material;
wherein the particle size of the biochar is 0.5mm, the particle size of the calcium carbonate is 120nm, the particle size of the sodium sulfide is 50nm, and the particle size of the ferric oxide is 30 nm;
the biochar is formed by mixing straw biochar and straw biochar according to a mass ratio of 1: 1;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate according to a mass ratio of 2:1, continuously stirring, adding the adhesive, heating at 60 deg.C for 30min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 10 percent of the mass of the monopotassium phosphate;
the adhesive is obtained by mixing magnesium slag and silicate according to the mass ratio of 1:1, adding water and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 15 percent.
The silicate is prepared by mixing kaolinite powder, calcium feldspar powder and talcum powder according to the mass ratio of 1:2: 1;
the particle sizes of the calcium oxide and the potassium dihydrogen phosphate are both 20 mu m.
S4: soil remediation
Firstly, conveying the soil obtained by the treatment in the step S1 into a stirrer, adding regulating water to control the water content of the soil to be 60%, then adding a first repairing material, and fully stirring;
wherein the first repairing material accounts for 0.5 percent of the mass ratio of the soil; ventilating at normal temperature for 28 days, and adding a second repair material; fully stirring again, ventilating at normal temperature and standing for 30 days; wherein the second repair material accounts for 0.5 percent of the mass ratio of the soil.
Example 2:
a method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material comprises the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, wherein the particle size of the soil is 1.8 mm; then sampling and analyzing the heavy metal content of the soil;
s2: preparing the first repair material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 5:3:2, heating for 4 hours at 96 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to the mass ratio of 3:1, mixing, carrying out magnetization grinding treatment for 25min, heating in a water bath at 85 ℃ for 90min, and continuously stirring to obtain a first repair material;
wherein the particle size of the biochar is 0.8mm, the particle size of the calcium carbonate is 160nm, the particle size of the sodium sulfide is 65nm, and the particle size of the ferric oxide is 45 nm;
the biochar is formed by mixing straw biochar and straw biochar according to a mass ratio of 1: 1;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate according to a mass ratio of 2.5:1, continuously stirring, adding the adhesive, heating at 75 ℃ for 45min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 13 percent of the mass of the monopotassium phosphate;
the adhesive is prepared by mixing magnesium slag and silicate according to the mass ratio of 2:1, adding water and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 25 percent
The silicate is prepared by mixing kaolinite powder, calcium feldspar powder and talcum powder according to the mass ratio of 1:2: 1;
the particle sizes of the calcium oxide and the potassium dihydrogen phosphate are both 50 μm.
S4: soil remediation
Firstly, conveying the soil obtained by the treatment in the step S1 into a stirrer, adding regulating water to control the water content of the soil to be 62%, then adding a first repairing material, and fully stirring;
wherein the first repairing material accounts for 1% of the soil by mass; ventilating at normal temperature for 33 days, and adding a second repair material; fully stirring again, ventilating at normal temperature and standing for 45 days; wherein the second repair material accounts for 1.5 percent of the mass ratio of the soil.
Example 3:
a method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material comprises the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, wherein the particle size of the soil is 1.8 mm; then sampling and analyzing the heavy metal content of the soil;
s2: preparing the first repair material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 7:5:3, heating for 8 hours at 125 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to a mass ratio of 4: 1, mixing, carrying out magnetization grinding treatment for 30min, then heating in a water bath at 95 ℃ for 120min, and continuously stirring to obtain a first repair material;
wherein the particle size of the biochar is 1.2mm, the particle size of the calcium carbonate is 200nm, the particle size of the sodium sulfide is 80nm, and the particle size of the ferric oxide is 60 nm;
the biochar is formed by mixing straw biochar and straw biochar according to a mass ratio of 1: 1;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate according to a mass ratio of 3:1, continuously stirring, adding an adhesive, heating at 95 ℃ for 60min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 16 percent of the mass of the monopotassium phosphate;
the adhesive is prepared by mixing magnesium slag and silicate according to the mass ratio of 3:1, adding water and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 35 percent
The silicate is prepared by mixing kaolinite powder, calcium feldspar powder and talcum powder according to the mass ratio of 1:2: 1;
the particle sizes of the calcium oxide and the potassium dihydrogen phosphate are both 80 mu m.
S4: soil remediation
Firstly, the soil obtained by the treatment of the step S1 is sent into a stirrer, regulating water is added to control the water content of the soil to be 65%, and then a first repairing material is added and fully stirred;
wherein the first repairing material accounts for 3% of the soil mass ratio; ventilating at normal temperature for 38 days, and adding a second repair material; fully stirring again, ventilating at normal temperature and standing for 60 days; wherein the second repair material accounts for 2% of the soil mass ratio.
Example 4:
a method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material comprises the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, wherein the particle size of the soil is 1.6 mm; then sampling and analyzing the heavy metal content of the soil;
s2: preparing the first repair material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 5:4:2.5, heating for 5 hours at 100 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to the mass ratio of 3:1, mixing, carrying out magnetization grinding treatment for 25min, heating in a water bath at 85 ℃ for 90min, and continuously stirring to obtain a first repair material;
modifying the obtained first repairing material;
mixing a first repairing material, calcium superphosphate and calcium oxide according to a mass ratio of 1:3:2, heating in a water bath for 5 hours at 85 ℃, and continuously stirring;
wherein the particle size of the biochar is 0.8mm, the particle size of the calcium carbonate is 150nm, the particle size of the sodium sulfide is 60nm, and the particle size of the ferric oxide is 45 nm;
the biochar is formed by mixing straw biochar and straw biochar according to a mass ratio of 1: 1;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate according to a mass ratio of 2:1, continuously stirring, adding adhesive, heating at 85 deg.C for 50min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 13 percent of the mass of the monopotassium phosphate;
the adhesive is prepared by mixing magnesium slag and silicate according to the mass ratio of 2:1, adding water and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 35 percent
The silicate is prepared by mixing kaolinite powder, calcium feldspar powder and talcum powder according to the mass ratio of 1:2: 1;
the particle sizes of the calcium oxide and the potassium dihydrogen phosphate are both 40 mu m.
S4: soil remediation
Firstly, conveying the soil obtained by the treatment in the step S1 into a stirrer, adding regulating water to control the water content of the soil to be 62%, then adding a first repairing material, and fully stirring;
wherein the first repairing material accounts for 2.2 percent of the mass ratio of the soil; ventilating at normal temperature and standing for 30 days, and adding a second repair material; fully stirring again, ventilating at normal temperature and standing for 38 days; wherein the second repair material accounts for 1.3 percent of the mass ratio of the soil.
Example 5:
a method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material comprises the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired; then sampling and analyzing the heavy metal content of the soil;
s2: preparing the first repairing material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 5:3:3, heating for 6 hours at 125 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to the mass ratio of 3:1, mixing, carrying out magnetization grinding treatment for 25min, heating in a water bath at 85 ℃ for 95min, and continuously stirring to obtain a first repair material;
modifying the obtained first repairing material;
mixing the first repair material, calcium superphosphate and calcium oxide according to the mass ratio of 1:3:2, heating in water bath for 4.5h at 86 ℃, and continuously stirring;
wherein the particle size of the biochar is 0.8mm, the particle size of the calcium carbonate is 150nm, the particle size of the sodium sulfide is 58nm, and the particle size of the ferric oxide is 40 nm;
the biochar is prepared from straw biochar, straw biochar and wood chip biochar in a mass ratio of 1:1, mixing;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate at a mass ratio of 2.5:1, continuously stirring, adding adhesive, heating at 80 deg.C for 45min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 10 percent of the mass of the monopotassium phosphate;
the adhesive is prepared by mixing magnesium slag and silicate according to the mass ratio of 2:1, adding water and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 25 percent
The silicate is prepared by mixing kaolinite powder, calcium feldspar powder and talcum powder according to the mass ratio of 1:2: 1;
the particle sizes of the calcium oxide and the potassium dihydrogen phosphate are both 50 μm.
S4: soil remediation
Firstly, the soil obtained by the treatment of the step S1 is sent into a stirrer, regulating water is added to control the water content of the soil to be 65%, and then the first repairing material and the second repairing material are added together and stirred uniformly; ventilating at normal temperature and standing for 55 days.
Wherein the first repairing material accounts for 1.5 percent of the mass ratio of the soil; the second repairing material accounts for 1% of the soil mass ratio.
Test example:
taking soil with the effective state content of heavy metal cadmium of 68mg/kg, and carrying out stabilization restoration by adopting the method of the embodiment 1-5; and comparing with the traditional biochar stabilization repair, and recording experimental data as the following table 1:
table 1: the content of the effective state of the heavy metal cadmium in each embodiment and after the traditional biochar repairing treatment
Wherein the experimental conditions of the culture environment are consistent, and the temperature is changed within the range of-10 ℃ to 18 ℃ in 24 hours.
Compared with the conventional biochar-treated metal cadmium effective state content of 22.38mg/kg, the stabilization repair method provided by the invention can reduce the metal cadmium effective state content to below 13.82mg/kg through the comprehensive action of the first repair material and the second repair material; wherein, the embodiment 4 can reduce the effective state content of the metallic cadmium to 9.60, and is the best embodiment provided by the invention.
Claims (6)
1. A method for restoring farmland soil with heavy metal cadmium by using a stabilized restoring material is characterized by comprising the following steps:
s1: soil treatment
Primarily screening the soil to be repaired, and separating impurities with the particle size larger than 35mm in the soil to be repaired; crushing the obtained soil to be repaired;
s2: preparing the first repair material
Mixing and stirring the biochar, calcium carbonate and sodium sulfide according to a mass ratio of 3-7: 2-5: 2-3, heating for 3-8 hours at 85-125 ℃, and continuously stirring to obtain a mixture; and then mixing the obtained mixture with iron oxide according to a mass ratio of 2-4: 1, mixing, carrying out magnetization grinding treatment for 20-30 min, heating in water bath at 80-95 ℃ for 60-120 min, and continuously stirring to obtain a first repair material;
s3: preparation of the second repair Material
Mixing calcium oxide and potassium dihydrogen phosphate according to the mass ratio of 2-3: 1, continuously stirring, adding an adhesive, heating at 60-95 ℃ for 30-60 min, and continuously stirring; preparing a second repair material; the addition amount of the adhesive is 10-16% of the mass of the monopotassium phosphate;
the adhesive is obtained by mixing magnesium slag and silicate according to the mass ratio of 1-3: 1, adding water and uniformly stirring; the total mass fraction of the magnesium slag and the silicate is 15-35%; the silicate is any one or any combination of more than two of feldspar powder, albite powder, kaolinite powder, calcium feldspar powder and talcum powder;
s4: soil remediation
Firstly, feeding the soil obtained by crushing in the step S1 into a stirrer, adding regulating water to control the water content of the soil to be 60-65%, then adding a first repairing material, and fully stirring;
wherein the first repairing material accounts for 0.5-3% of the soil by mass; ventilating at normal temperature for 28-38 days, and adding a second repair material; fully stirring again, and ventilating and placing for 30-60 days at normal temperature; wherein the mass ratio of the second repairing material to the soil is 0.5-2%.
2. The method for remediating heavy metal cadmium farmland soil by using the stabilized remediation material as claimed in claim 1, wherein in the step S2, the particle size of the biochar is 0.5-1.2 mm, the particle size of the calcium carbonate is 120-200 nm, the particle size of the sodium sulfide is 50-80 nm, and the particle size of the ferric oxide is 30-60 nm.
3. The method for remediating farmland soil with heavy metal cadmium by using the stabilized remediation material as claimed in claim 1, wherein the first remediation material obtained in the step S2 is subjected to modification treatment;
mixing the first repairing material, calcium superphosphate and calcium oxide according to the mass ratio of 1:3:2, heating in a water bath at the temperature of 80-95 ℃ for 3-6 hours, and continuously stirring.
4. The method for remediating heavy metal cadmium farmland soil by using the stabilized remediation material as claimed in claim 1, wherein the particle sizes of the calcium oxide and the potassium dihydrogen phosphate in the step S3 are both 20-80 μm.
5. The method for remediating heavy metal cadmium farmland soil by using the stabilized restoration material as claimed in claim 1, wherein in step S2, the biochar, the calcium carbonate and the alkali sulfide are mixed and stirred according to the mass ratio of 5:3:2, heated for 4 hours at 96 ℃, and continuously stirred to obtain a mixture; and then mixing the obtained mixture with iron oxide according to the mass ratio of 3:1, carrying out magnetization grinding treatment for 25min, heating in a water bath at 85 ℃ for 90min, and continuously stirring to obtain a first repairing material.
6. The method for remediating farmland soil with heavy metal cadmium by using the stabilized remediation material as claimed in claim 1, wherein the biochar in the step S2 is any one or any combination of straw biochar and sawdust biochar.
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