CN111334308A - Soil heavy metal passivator, preparation method thereof and soil remediation method - Google Patents
Soil heavy metal passivator, preparation method thereof and soil remediation method Download PDFInfo
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- CN111334308A CN111334308A CN202010313246.XA CN202010313246A CN111334308A CN 111334308 A CN111334308 A CN 111334308A CN 202010313246 A CN202010313246 A CN 202010313246A CN 111334308 A CN111334308 A CN 111334308A
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- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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Abstract
The invention relates to a soil heavy metal passivator, a preparation method thereof and a soil remediation method. The soil heavy metal passivator comprises the following components in parts by weight: 60-90 parts of oyster shell powder, 1-10 parts of organic matters and 10-20 parts of fly ash, wherein the oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃. The soil heavy metal passivator is low in cost and good in passivation effect.
Description
Technical Field
The invention relates to the field of soil remediation, in particular to a soil heavy metal passivator, a preparation method thereof and a soil remediation method.
Background
Soil is a non-renewable resource and is a natural resource on which humans live. The heavy metal pollution of soil is a worldwide environmental pollution problem, and is widely concerned by various industries in society at present. The heavy metal pollution of the soil not only affects the environmental quality of the soil, but also causes unpredictable threat to human health.
The application of the heavy metal passivator in the soil improves the bad characters of the soil, reduces the effectiveness of the heavy metal, fixes or passivates the heavy metal in situ, and is one of the development directions of the heavy metal polluted agricultural soil remediation. However, the traditional soil heavy metal passivator has high cost and poor passivation effect.
Disclosure of Invention
Therefore, the soil heavy metal passivator with low cost and good passivation effect is needed to be provided.
In addition, a preparation method of the soil heavy metal passivator and a soil remediation method are also provided.
A soil heavy metal passivator comprises the following components in parts by weight: 60-90 parts of oyster shell powder, 1-10 parts of organic matters and 10-20 parts of fly ash, wherein the oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃.
In one embodiment, the weight content of calcium oxide in the oyster shell powder is not less than 40%.
In one embodiment, the organic matter comprises at least one of potassium fulvate and ammoniated humic acid.
In one embodiment, the mass content of calcium oxide in the fly ash is not less than 10%.
In one embodiment, the pH value of the soil heavy metal passivator is 9.0-10.5.
A preparation method of a soil heavy metal passivator comprises the following steps:
roasting oyster shells at 1100-1200 ℃, and then crushing to obtain oyster shell powder;
weighing the following raw materials in parts by weight: 60-90 parts of oyster shell powder, 1-10 parts of organic matter and 10-20 parts of fly ash; and
and mixing the raw materials to obtain the soil heavy metal passivator.
In one embodiment, in the step of roasting the oyster shells at 1100-1200 ℃, the roasting time is 20-60 min.
A soil remediation method comprising the steps of:
providing a soil heavy metal passivator, wherein the soil heavy metal passivator comprises the following components in parts by mass: 60-90 parts of oyster shell powder, 1-10 parts of organic matters and 10-20 parts of fly ash, wherein the oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃; and
and mixing the soil heavy metal passivator with the soil to be repaired.
In one embodiment, in the step of mixing the soil heavy metal passivator with the soil to be repaired, the addition amount of the soil heavy metal passivator is 100kg to 200kg per mu of the soil to be repaired.
In one embodiment, the soil to be remediated is soil contaminated with at least one heavy metal of lead and cadmium.
After being roasted and crushed at high temperature, the oyster shell powder in the soil heavy metal passivator contains high-content calcium oxide, the pH value of the soil can be quickly increased, the increase of the pH value causes the change of the form of heavy metal in the soil, the bioavailability of the heavy metal is reduced, and the absorption of crops to the heavy metal is reduced; in addition, the oyster shell powder has a billion-grade special honeycomb spongy microporous structure, a large specific surface area and continuous adsorption capacity on heavy metals, and is matched with high-activity organic matters and fly ash, so that the soil heavy metal passivator can passivate a plurality of heavy metals such as lead, cadmium and the like, and the effectiveness of the soil heavy metals is effectively reduced. In addition, the oyster shell powder, the organic matters and the fly ash are cheap and easy to obtain, so that the cost of the soil heavy metal passivator is reduced. Therefore, the heavy metal passivator is low in cost and good in passivation effect.
Drawings
Fig. 1 is a process flow diagram of a preparation method of a soil heavy metal passivator according to an embodiment.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description taken in conjunction with the accompanying drawings. The detailed description sets forth the preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The soil heavy metal passivator of an embodiment comprises the following components in parts by weight: 60 to 90 portions of oyster shell powder, 1 to 10 portions of organic matter and 10 to 20 portions of fly ash. The oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃.
Wherein, the oyster shell powder is obtained by the following steps: roasting oyster shell at 1100-1200 deg.c for 20-60 min, and crushing to obtain oyster shell powder. Further, the roasting time is 40-60 min. In actual production, the oyster shell powder is roasted in a rotary drying cylinder. The inclination angle of the rotary drying cylinder is 1.7-3 degrees, and the rotating speed is 2 r/mim-5 r/min. In one embodiment, the rotary dryer drum is 1.5 meters in diameter and 12 meters long. The oyster shell and the high-temperature airflow in the rotary drying cylinder flow in the reverse direction, namely the oyster shell is fed at a low-temperature port at a flow rate of 4.0 t/h-6.0 t/h, the oyster shell is discharged at a high-temperature port, and the dried oyster shell is mechanically crushed to obtain the oyster shell powder.
Specifically, the grain diameter of the oyster shell powder is 40-80 meshes. Further, the mass content of calcium oxide in the oyster shell powder is not less than 40%.
In one embodiment, the weight portion of the oyster shell powder is 60, 70, 80 or 90.
Waste oyster shells are activated at high temperature, contain calcium oxide, calcium hydroxide, calcium carbonate, chitin, trace elements and the like, belong to medium-strong alkaline substances, can change the acidity and alkalinity of soil to a certain extent, increase the pH value of the soil, lead to the change of the heavy metal form of the soil due to the increase of the pH value, and reduce the biological effectiveness along with the increase of the pH value. In addition, the special porous structure of the oyster shell provides a breathable and rich habitat microenvironment for microorganisms, and the survival problem of the microorganisms is effectively solved by matching with organic nutrition. Therefore, the oyster shell powder after high-temperature roasting is a soil heavy metal passivator material with low cost and good passivation effect.
The organic matter comprises at least one of biochemical potassium fulvate and ammoniated humic acid. The organic matter can promote the growth and propagation of microbes in soil, and has certain complexation effect on heavy metal in soil to further passivate the heavy metal. In one embodiment, the organic matter is 1 part, 2 parts, 5 parts, 6 parts, 8 parts or 10 parts by mass.
The mass content of calcium oxide in the fly ash is not less than 10%. The fly ash contains alkaline substances such as calcium oxide and the like, can adjust the pH value of soil, and has better adsorption and fixation effects on heavy metals in the soil. In one embodiment, the fly ash is 10 parts, 12 parts, 15 parts, 18 parts or 20 parts by mass.
Further, the pH value of the soil heavy metal passivator is 9.0-10.5. The soil heavy metal passivator has a good passivating effect on heavy metals cadmium and lead in soil.
Further, the soil heavy metal passivator comprises the following components in parts by weight: 70 to 90 portions of oyster shell powder, 3 to 8 portions of organic matter and 12 to 18 portions of fly ash.
A soil heavy metal passivator in the prior art is humins and sulfhydrylation humins, and is prepared by extracting humins from peat soil and carrying out sulfhydrylation treatment on the humins to prepare the sulfhydrylation humins. The method specifically comprises three steps of peat soil pretreatment, humin extraction and humin sulfhydrylation. Firstly, air-drying peat soil, sieving, weighing a proper amount of peat soil, mixing the peat soil with a sodium hydroxide solution, placing the peat soil on a shaking table to shake, standing, centrifugally separating, washing, and air-drying to obtain crude Humin (HM); then proportionally adding mixed solution of thioglycolic acid, acetic anhydride and acetic acid, concentrated sulfuric acid solution and crude humin, stirring and cooling, placing in a water bath for reaction, washing and air drying to obtain the sulfhydrylated humin. The soil heavy metal passivator prepared by the method can improve the passivation rate of Cd in the polluted soil, but the method is complex in process and high in cost.
In addition, the soil heavy metal passivator in the traditional technology comprises the following components in parts by weight: 20-35 parts of humic acid, 30-50 parts of sulfhydryl compound, 10-30 parts of calcium phosphate and 3-10 parts of chitosan. The soil heavy metal passivator can effectively reduce the effectiveness of heavy metal mercury in soil and reduce the absorption and enrichment of mercury by crops.
Another conventional technique for preparing a heavy metal deactivator is as follows: drying and grinding alum sludge, then placing the dried and ground alum sludge in a muffle furnace, uniformly heating to 800 ℃ at a constant speed of 5 ℃/min, roasting for 1-2 h, then naturally cooling, washing with water to neutrality, and drying; secondly, mixing the solid intermediate product obtained in the first step with 0.5-5.0 mol/L NaOH solution, preparing a solution according to the solid-to-liquid ratio of 0.5-1 g: 5-10 mL, adding 0.5% Tween 80, heating in a water bath, controlling the reaction temperature and the stirring speed to be 100 ℃ and 600r/min respectively, and reacting for 2-5 hours; and step three, after the reaction in the step two is finished, cooling, precipitating and washing to be neutral, drying the solid part, and grinding to be less than 100 microns in fineness to obtain the hydroxyl alum sludge. The preparation method of the passivator is complex in process and high in cost.
In addition, the soil heavy metal composite passivator in the traditional technology is a powdery particulate matter formed by mixing modified palygorskite, biomass charcoal, quicklime and mushroom dregs according to the proportion of 1: 0.3-0.5: 0.5-0.8: 0.2-0.4, and the particle size is preferably 0.5-1 mm.
Therefore, the traditional soil heavy metal passivator has the problems of complex preparation process, high cost and poor passivation effect.
The soil heavy metal passivator of the embodiment at least has the following advantages:
(1) oyster shell in the soil heavy metal passivator is activated and crushed at high temperature and is matched with high-activity organic matters and fly ash, so that the soil heavy metal passivator can passivate a plurality of heavy metals such as lead, cadmium and the like, effectively reduce the effectiveness of the heavy metals in the soil, condition soil acidification, improve soil hardening, improve the soil aggregate structure and increase the content of beneficial bacteria, and is a soil heavy metal passivator with quick-acting stability.
(2) The soil heavy metal passivator takes cheap and easily-obtained oyster shell powder, organic matters and fly ash as raw materials, so that the cost of the soil heavy metal passivator is reduced, and the economic benefit is improved.
Referring to fig. 1, a method for preparing a soil heavy metal passivator according to an embodiment is a method for preparing a soil heavy metal passivator according to the above embodiment, and includes the following steps:
step S110: roasting oyster shell at 1100-1200 deg.c and crushing to obtain oyster shell powder.
Wherein the roasting time is 20 min-60 min. Further, the roasting time is 40-60 min. In actual production, the oyster shell powder is roasted in a rotary drying cylinder. The inclination angle of the rotary drying cylinder is 1.7-3 degrees, and the rotating speed is 2 r/mim-5 r/min. Oyster shell is dried for 20min to 60min in a rotary drying cylinder by adopting a gradual heating method from 100 ℃ to 1100 ℃ to 1200 ℃. Oyster shell and high temperature airflow in the rotary drying cylinder flow in the reverse direction, that is, oyster shell is fed at the low temperature port at the flow rate of 4.0 t/h-6.0 t/h and discharged at the high temperature port, the rotating speed is controlled at 2 r/mim-5 r/min, and the dried oyster shell is crushed.
Specifically, the grain diameter of the oyster shell powder is 40-80 meshes. Further, the mass content of calcium oxide in the oyster shell powder is not less than 40%.
Step S120: weighing the following raw materials in parts by weight: 60 to 90 portions of oyster shell powder, 1 to 10 portions of organic matter and 10 to 20 portions of fly ash.
In one embodiment, the weight portion of the oyster shell powder is 60, 70, 80 or 90.
The organic matter comprises at least one of biochemical potassium fulvate and ammoniated humic acid. The organic matter can promote the growth and propagation of microbes in soil, and has certain complexation effect on heavy metal in soil to further passivate the heavy metal. In one embodiment, the organic matter is 1 part, 2 parts, 5 parts, 6 parts, 8 parts or 10 parts by mass.
The mass content of calcium oxide in the fly ash is not less than 10%. The fly ash contains alkaline substances such as calcium oxide and the like, can adjust the pH value of soil, and has better adsorption and fixation effects on heavy metals in the soil. In one embodiment, the fly ash is 10 parts, 12 parts, 15 parts, 18 parts or 20 parts by mass.
Further, in step S120, the raw materials are in parts by weight: 70 to 90 portions of oyster shell powder, 3 to 8 portions of organic matter and 12 to 18 portions of fly ash.
Step S130: and mixing the raw materials to obtain the soil heavy metal passivator.
Specifically, the pH value of the soil heavy metal passivator is 9.0-10.5.
The preparation method of the soil heavy metal passivator at least has the following advantages:
(1) the soil heavy metal passivator prepared by the preparation method of the soil heavy metal passivator utilizes waste oyster shells, organic matters, coal ash and the like, and has low raw material cost and high economic benefit.
(2) The soil heavy metal passivator prepared by the preparation method of the soil heavy metal passivator contains calcium oxide, calcium hydroxide and calcium carbonate, and belongs to medium-strong alkaline substances, the calcium oxide can rapidly and obviously improve the pH value of soil, and the increase of the pH value causes the change of the form of heavy metal in the soil, so that the bioavailability of the heavy metal is reduced, and the absorption of heavy metal by crops is reduced; the oyster powder after high-temperature activation still has a billion-grade special honeycomb spongy microporous structure, a large specific surface area and continuous adsorption capacity on heavy metals, and the pH value of soil can be stabilized in a high range by the contained calcium hydroxide and calcium carbonate, so that the heavy metals are stably passivated.
(3) The soil heavy metal passivator prepared by the preparation method of the soil heavy metal passivator can effectively neutralize soil acidity, improve soil structure, improve soil aggregate structure, preserve water and fertilizer, promote crop growth and increase the number of beneficial microorganisms.
(4) The preparation method of the soil heavy metal passivator is simple in process and easy for industrial production.
A soil remediation method of an embodiment includes the steps of:
providing a soil heavy metal passivator, wherein the soil heavy metal passivator comprises the following components in parts by mass: 60-90 parts of oyster shell powder, 1-10 parts of organic matters and 10-20 parts of fly ash, wherein the oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃;
and mixing the soil heavy metal passivator with soil to be repaired.
Specifically, the addition amount of the soil heavy metal passivator in each mu of soil to be repaired is 100 kg-200 kg. Furthermore, the addition amount of the soil heavy metal passivator in each mu of soil to be repaired is 150 kg-200 kg. In one embodiment, the step of mixing the soil heavy metal passivator with the soil to be repaired comprises the following steps: the soil heavy metal passivator is uniformly scattered on the soil to be repaired, then the soil is turned, the water holding capacity of the soil to be repaired is kept at 60%, and the soil is kept for more than 3 months.
In one embodiment, the soil to be remediated is soil contaminated with at least one heavy metal of lead and cadmium.
The soil remediation method is simple to operate, and can achieve a good remediation effect on the soil to be remediated.
The following is an example section:
example 1
The preparation process of the soil heavy metal passivator of the embodiment is as follows:
(1) oyster shell powder preparation: adding waste oyster shells from a feeding port of a drying cylinder at a flow rate of 5.5t/h, opening the drying cylinder to rotate at 5.0r/min, and rotating the oyster shells from an inlet to an outlet, wherein the whole process is carried out for 50min, the temperature of the feeding port is controlled to be 100 ℃, the temperature of a discharge port is controlled to be 1200 ℃, and then mechanically crushing is carried out to obtain the oyster shell powder.
(2) According to the weight portion, 80 portions of oyster shell powder, 5 portions of biochemical potassium fulvate and 15 portions of fly ash are fully mixed, wherein the mass content of calcium oxide in the oyster shell powder is 65%, and the mass content of calcium oxide in the fly ash is 12%, so that the soil heavy metal passivator is obtained.
Example 2
The preparation process of the soil heavy metal passivator of the embodiment is as follows:
(1) oyster shell powder preparation: adding waste oyster shells from a drying cylinder at a flow rate of 5.5t/h from a feeding port, opening the drying cylinder to rotate at 4.0r/min, and rotating the oyster shells from an inlet to an outlet, wherein the whole process is 60min, the temperature of the feeding port is controlled at 100 ℃, the temperature of a discharge port is controlled at 1100 ℃, and then mechanically crushing is carried out to obtain the oyster shell powder.
(2) According to the weight portion, 78 portions of oyster shell powder, 6 portions of ammoniated humic acid and 20 portions of fly ash are fully mixed, wherein the mass content of calcium oxide in the oyster shell powder is 62%, and the mass content of calcium oxide in the fly ash is 12%, so that the soil heavy metal passivator is obtained.
Example 3
The preparation process of the soil heavy metal passivator of the embodiment is as follows:
(1) oyster shell powder preparation: adding waste oyster shells from a drying cylinder at a flow rate of 5.5t/h from a feeding port, opening the drying cylinder to rotate at 6.1r/min, and rotating the oyster shells from an inlet to an outlet, wherein the temperature of the feeding port is controlled at 100 ℃ and the temperature of a discharge port is controlled at 1150 ℃ in the whole process for 35min, and then mechanically crushing to obtain the oyster shell powder.
(2) According to the weight portion, 60 portions of oyster shell powder, 3 portions of ammoniated humic acid and 10 portions of fly ash are fully mixed, wherein the mass content of calcium oxide in the oyster shell powder is 50%, and the mass content of calcium oxide in the fly ash is 12%, so that the soil heavy metal passivator is obtained.
Example 4
The preparation process of the soil heavy metal passivator of the embodiment is as follows:
(1) oyster shell powder preparation: adding waste oyster shells from a feeding port of a drying cylinder at a flow rate of 5.5t/h, opening the drying cylinder to rotate at 5.5r/min, and rotating the oyster shells from an inlet to an outlet, wherein the temperature of the feeding port is controlled at 100 ℃ and the temperature of a discharge port is controlled at 1150 ℃ in the whole process of 45min, and then mechanically crushing to obtain the oyster shell powder.
(2) According to the weight portion, 70 portions of oyster shell powder, 6 portions of ammoniated humic acid and 18 portions of fly ash are fully mixed, wherein the mass content of calcium oxide in the oyster shell powder is 52%, and the mass content of calcium oxide in the fly ash is 12%, so that the soil heavy metal passivator is obtained.
Comparative example 1
The preparation process of the soil heavy metal passivator of comparative example 1 is similar to that of example 1, except that: step (1) of comparative example 1 was: mechanically pulverizing Concha Ostreae powder to obtain Concha Ostreae powder.
Comparative example 2
The preparation process of the soil heavy metal passivator of comparative example 2 is similar to that of example 1, except that: step (2) of comparative example 2 was: according to the weight portion, 80 portions of oyster shell powder, 5 portions of biochemical fulvic acid potassium and 1 portion of phosphate rock powder are fully mixed to obtain the soil heavy metal passivator.
Comparative example 3
The preparation process of the soil heavy metal passivator of comparative example 3 is similar to that of example 1, except that: in the step (2) of the comparative example 3, the mass content of calcium oxide in the fly ash is 7%.
Comparative example 4
The preparation process of the soil heavy metal passivator of comparative example 4 is similar to that of example 1, except that: in the step (2) of the comparative example 4, the oyster shell powder is 50 parts by mass.
Comparative example 5
The preparation process of the soil heavy metal passivator of comparative example 5 is similar to that of example 1, except that: in the step (2) of the comparative example 5, the biochemical fulvic acid potassium is 0 part by mass.
Comparative example 6
The preparation process of the soil heavy metal passivator of comparative example 6 is similar to that of example 1, except that: in the step (2) of the comparative example 6, the mass part of the fly ash is 8 parts.
The following are test sections:
1. taking passivated heavy metal cadmium as an example, and flowering cabbage pot culture as an object, the soil heavy metal passivators of the examples 1 to 4 on cadmium soil to be repaired are compared with soil heavy metal passivators of a competitive product 1, a competitive product 2 and a comparative example 1 to a comparative example 6, the content of effective cadmium in soil and the influence on the content, growth vigor and yield of flowering cabbage cadmium are researched, and data shown in table 1 are obtained.
The specific method for applying the soil heavy metal passivator to the cadmium soil to be repaired is as follows: uniformly spreading the soil heavy metal passivator on cadmium soil to be repaired according to the dosage of 150 kg-200 kg per mu, turning the soil, keeping the field water capacity of the soil at 60%, and stabilizing for more than 3 months.
TABLE 1 Effect of different passivators on soil cadmium and flowering cabbage
Wherein, the competition product 1 is ground phosphate rock, and the competition product 2 is fly ash.
As shown in Table 1, according to the detection method of the effective cadmium in the soil in GB/T23739-2009, the effective cadmium content in the soil applied with the soil heavy metal passivator prepared in example 1 is reduced by 35.38% and 26.68% respectively compared with the soil applied with the competitive products 1 and 2.
The soil pH value was measured using a pH meter, and the soil pH of the soil applied with the soil heavy metal passivator prepared in example 1 was increased by 0.31 and 0.25 units compared to the soil applied with the treatments 1 and 2, respectively.
According to the detection method of the cadmium content in the vegetable core in GB/T5009.15, the cadmium content of the vegetable core of the soil heavy metal passivator prepared in the application example 1 is respectively reduced by 39.34% and 34.22%, the plant height is respectively increased by 17.24% and 16.12%, and the weight of a single plant is respectively increased by 31.20% and 17.31% compared with the cadmium content of the vegetable core of the competitive products 1 and 2.
As can be seen from the data in table 1 above, the passivation effect of the soil heavy metal passivator of example 1 is better than that of the soil heavy metal passivators of competitors 1 and 2.
2. The soil heavy metal passivators prepared in the examples 1 to 4 and the comparative examples 1 to 6 are mixed with soil to be repaired according to different addition amounts, and passivation rate data of different soil heavy metal passivators with different addition amounts are shown in the following table 2.
Wherein, the passivation rate is × 100% of (the content of the effective state of the heavy metal in the soil to be repaired initially-the effective content of the heavy metal in the passivated soil)/the content of the effective state of the heavy metal in the soil to be repaired initially.
TABLE 2 passivation Rate data for soil heavy metal passivators of examples and comparative examples
As can be seen from table 2 above, the passivation rates of the soil heavy metal passivators prepared in examples 1 to 4 are significantly higher than those of the soil heavy metal passivators in comparative examples 1 to 6. The passivation rate of the soil heavy metal passivator increases with the addition amount, and when the addition amount of the soil heavy metal passivator exceeds 200 kg/mu, the increase of the passivation rate becomes slow.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The soil heavy metal passivator is characterized by comprising the following components in parts by mass: 60-90 parts of oyster shell powder, 1-10 parts of organic matters and 10-20 parts of fly ash, wherein the oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃.
2. The soil heavy metal passivator of claim 1, wherein the mass content of calcium oxide in the oyster shell powder is not less than 40%.
3. The soil heavy metal passivator of claim 1, wherein the organic matter comprises at least one of biochemical potassium fulvate and ammoniated humic acid.
4. The soil heavy metal passivator of claim 1, wherein the mass content of calcium oxide in the fly ash is not less than 10%.
5. The soil heavy metal passivator of claim 1, wherein the pH of the soil heavy metal passivator is 9.0-10.5.
6. The preparation method of the soil heavy metal passivator is characterized by comprising the following steps:
roasting oyster shells at 1100-1200 ℃, and then crushing to obtain oyster shell powder;
weighing the following raw materials in parts by weight: 60 to 90 portions of oyster shell powder, 1 to 10 portions of organic matter and 10 to 20 portions of fly ash; and
and mixing the raw materials to obtain the soil heavy metal passivator.
7. The method for preparing a soil heavy metal passivator as claimed in claim 6, wherein in the step of roasting oyster shells at 1100-1200 ℃, the roasting time is 20-60 min.
8. A soil remediation method, comprising the steps of:
providing a soil heavy metal passivator, wherein the soil heavy metal passivator comprises the following components in parts by mass: 60-90 parts of oyster shell powder, 1-10 parts of organic matters and 10-20 parts of fly ash, wherein the oyster shell powder is obtained by roasting and crushing oyster shells at 1100-1200 ℃; and
and mixing the soil heavy metal passivator with the soil to be repaired.
9. The soil remediation method of claim 8, wherein in the step of mixing the soil heavy metal passivator with the soil to be remediated, the soil heavy metal passivator is added in an amount of 100kg to 200kg per acre of the soil to be remediated.
10. The soil remediation method of claim 8 or 9, wherein the soil to be remediated is soil contaminated with at least one heavy metal selected from lead and cadmium.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111606769A (en) * | 2020-07-15 | 2020-09-01 | 江西普瑞丰生态科技有限公司 | Modifier for soil heavy metal pollution treatment and preparation method thereof |
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| CN111718723A (en) * | 2020-07-17 | 2020-09-29 | 浙江大学 | Phytic acid modified composite biochar soil conditioner and preparation method and application thereof |
| CN111718723B (en) * | 2020-07-17 | 2021-11-30 | 浙江大学 | Phytic acid modified composite biochar soil conditioner and preparation method and application thereof |
| CN114085677A (en) * | 2021-12-02 | 2022-02-25 | 南京大学环境规划设计研究院集团股份公司 | Preparation method and application of heavy metal passivation complexing agent |
| CN114797749A (en) * | 2022-04-12 | 2022-07-29 | 中国矿业大学(北京) | Heavy metal adsorbent and preparation method and application thereof |
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