CN104368306A - Preparation method of biochar-like matter used for heavy metal contaminated soil repair - Google Patents
Preparation method of biochar-like matter used for heavy metal contaminated soil repair Download PDFInfo
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- CN104368306A CN104368306A CN201410409206.XA CN201410409206A CN104368306A CN 104368306 A CN104368306 A CN 104368306A CN 201410409206 A CN201410409206 A CN 201410409206A CN 104368306 A CN104368306 A CN 104368306A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28004—Sorbent size or size distribution, e.g. particle size
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
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Abstract
The invention relates to a preparation method of a biochar-like matter used for heavy metal contaminated soil repair, the method includes pretreatment of raw materials, mixed inoculation of raw material bacteria liquid, low temperature pyrolysis and charring, crushing, screening and other steps, the biochar-like matter is prepared from one or more of plant and animal residues, food market garbage or kitchen wet waste as the raw materials, and compared with the existing technology such as replacement, electrokinetic remediation, complexation leaching, steam extraction, oxidation reduction electric mechanical repair and the like, the biochar-like matter adopts in-situ remediation technology, and has the advantages of low manufacturing and implementation cost, stability and the like.
Description
Technical field
The invention belongs to biological fermentation field, especially relate to a kind of preparation method of the class charcoal for heavy-metal contaminated soil reparation.
Background technology
China has the living beings of a large amount of such as stalk, rice husk and so on to suffer to burn waste every year, and this not only can bring contamination hazard to environment, also can cause waste and the loss of bioenergy.In recent years, along with pyrolytic technique is progressively carried out in China, abandoned biomass recycling and energy regeneration are achieved.But, while obtaining regenerative resource and chemicals by biomass pyrolytic technology, also create large batch of byproduct--charcoal.How fully and reasonably to utilize charcoal, how to make it turn waste into wealth, this needs people's problem demanding prompt solution, and so far, charcoal is widely used in agriculturally, is such as used to soil improvement and soil remediation.In addition, because charcoal has certain distributional effects and adsorption effect, charcoal is also used as adsorbent gradually, but charcoal adsorption site own is very limited, so its absorption property and stability are very limited.Therefore, high absorption property is prepared and the charcoal of stable in properties is significant.
Application number be 201310461243.0 Chinese patent disclose a kind of preparation method of modification biological charcoal, comprise the steps: 1) get appropriate charcoal, add the mixed liquor of the concentrated sulfuric acid and red fuming nitric acid (RFNA), stir and to carry out after a period of time filtering, wash, dry, obtain nitrated charcoal; 2) to step 1) in add water and reducing agent in the nitrated charcoal that obtains, carry out temperature rising reflux process after stirring, carry out after the cooling of question response thing filtering, wash, dry, namely obtain modification biological charcoal.
Summary of the invention
Object of the present invention is exactly provide a kind of preparation method of class charcoal repaired for heavy-metal contaminated soil that the heavy metal ion of leachable in soil, passive plant absorption is significantly reduced to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
For a preparation method for the class charcoal that heavy-metal contaminated soil is repaired, adopt following steps:
(1) pretreatment of raw material:
Plastics, metal, bone impurity in a, removal raw material;
Raw material after b, preliminary sorting enters disintegrating machine, and after fragmentation, the particle diameter of raw material is at 2 ~ 3cm;
Material after c, fragmentation enters squeezer, and after squeezing, the moisture content of material is 45% ~ 60%;
(2) material bacterium liquid combined inoculation: adopt batch mixer to turn, mixes bacterium liquid with the ratio of pretreated raw material by weight 1:1000;
(3) low temperature pyrogenation charing:
Turn the bank evenly and coning pile body, and natural wind is passed to heap body, make heap body inner a small amount of containing oxygen, be in double oxygen condition, the compound bacteria of the inoculation in material with the carbohydrate such as protein, grease, fat of easily degraded in material for nutrient source, be heat energy by metabolism, procreation etc. by organic chemical energy, make the temperature of heap body maintain 70 ~ 90 DEG C.(metabolism, procreation that body oxygen content only maintains microorganism is piled in the temperature of 70 ~ 90 DEG C and double oxygen, be heat energy by chemical energy, maintain heap temperature) condition under, cellulose in heap body, lignin and the organic matter pyrolysis charring gradually of not easily degrading, the specific area of material improves gradually.Supplement week about and once maintain the heap internal microorganism metabolism Carbon and nitrogen sources necessary with procreation, supplement a moisture every other month, low temperature pyrogenation through 8 ~ December carbonizes, obtain the thick product of class charcoal, by adopting above-mentioned middle slow pyrolysis charing, the energy more less than fast pyrogenation consumption and produce more biological substance, and low temperature pyrogenation carbonization process produces Wu bioxin.
(4) pulverize: thick product is crushed to particle diameter 1 ~ 2mm;
(5) screen: adopt gravity screening, remove the non-class charcoal material of Large stone and large density in product after pulverizing, obtain class charcoal finished product.
Described raw material is one or more in plant and animal residues, food market garbage or kitchen wet refuse.
The composite bacteria liquid that described bacterium liquid is bacillus cereus, Geobacillus stearothermophilus, aspergillus nidulans amass proportioning formation according to the bacteria liquid of 1:1:1, bacteria containing amount is 1-9 × 10
12individual/ml.
Every 1 hour, natural wind is passed into 15 minutes to heap body in step (3).
The Carbon and nitrogen sources supplemented in step (3) is industrial glucose and urea.
Supplement a moisture every other month in step (3), maintain moisture 45% ~ 60%.
Compared with prior art, the class charcoal that the present invention prepares is that pitchy is Powdered, and porous, unit weight are little, specific area is large, it is inspiratory good to absorb water.There is heat endurance, anti-decomposability, the cation exchange capacity (CEC) of superelevation and the feature of high charge density, hold abundant biochemical function group, effective class biological carbon content reaches 80 ~ 85%, content of humic acid is 8 ~ 10%, the effective microorganisms of a small amount of impurity and enormous amount, may be used for the soil remediation of heavy metal pollution, and possess following characteristics:
1, after class charcoal applies the soil of heavy metal pollution, can heavy metal ion (as lead ion, cadmium ion etc.) in quick adsorption soil.
2, reduced the amount of heavy metal acid soluble state by adsorption and ion-exchange, complexing, metal ion is stabilized in the lattice of class charcoal chemical constitution, makes the heavy metal ion of leachable in soil, passive plant absorption significantly reduce 85 ~ 95%.
3, the animal migration to underground water and surface water body of pollution abatement soil substantially can pollute, reduce the negative effect to Soil Biodiversity.
4, wherein humic acid can promote the fertility of soil simultaneously, in conjunction with the absorption feature of class biological carbon, significantly can reduce the nutraceutical losses such as the humic acid in soil, make soil fertility lastingly long-acting.
5, wherein effective microorganisms, can impel the forward succession of soil ecology.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
For a preparation method for the class charcoal that heavy-metal contaminated soil is repaired, adopt following steps:
(1) pretreatment of raw material:
A, removal raw material, comprise plastics, metal, bone impurity in plant and animal residues, food market garbage or kitchen wet refuse;
Raw material after b, preliminary sorting enters disintegrating machine, and after fragmentation, the particle diameter of raw material is at 2 ~ 3cm;
Material after c, fragmentation enters squeezer, and after squeezing, the moisture content of material is 45% ~ 60%;
(2) material bacterium liquid combined inoculation: adopt batch mixer to turn, bacterium liquid and the pretreated raw material ratio by weight 1: 1000 is mixed, the composite bacteria liquid that the bacterium liquid adopted is bacillus cereus, Geobacillus stearothermophilus, aspergillus nidulans amass proportioning formation by the bacteria liquid according to 1: 1: 1, bacteria containing amount is 1-9 × 10
12individual/ml;
(3) low temperature pyrogenation charing:
Turn the bank evenly and coning pile body, and natural wind is passed to heap body, passing into natural wind every 1 hour to heap body makes heap body inner a small amount of containing oxygen for 15 minutes, be in double oxygen condition, the compound bacteria of the inoculation in material with the carbohydrate such as protein, grease, fat of easily degraded in material for nutrient source, be heat energy by metabolism, procreation etc. by organic chemical energy, make the temperature of heap body maintain 70 ~ 90 DEG C.(metabolism, procreation that body oxygen content only maintains microorganism is piled in the temperature of 70 ~ 90 DEG C and double oxygen, be heat energy by chemical energy, maintain heap temperature) condition under, cellulose in heap body, lignin and the organic matter pyrolysis charring gradually of not easily degrading, the specific area of material improves gradually.
Supplement week about and once maintain the heap internal microorganism metabolism Carbon and nitrogen sources necessary with procreation, industrial glucose and urea can be adopted.
Supplement a moisture every other month, maintain moisture 45% ~ 60%.
Low temperature pyrogenation through 8 ~ December carbonizes, and obtains the thick product of class charcoal.
(4) pulverize: thick product is crushed to particle diameter 1 ~ 2mm;
(5) screen: adopt gravity screening, remove the non-class charcoal material of Large stone and large density in product after pulverizing, obtain class charcoal finished product.
Embodiment 2
For a preparation method for the class charcoal that heavy-metal contaminated soil is repaired, adopt following steps:
(1) pretreatment of raw material:
A, plastics, metal, the bone impurity removed in plant and animal residues, food market garbage or kitchen wet refuse;
Raw material after b, preliminary sorting enters disintegrating machine, and after fragmentation, the particle diameter of raw material is at 2cm;
Material after c, fragmentation enters squeezer, and after squeezing, the moisture content of material is 45%;
(2) material bacterium liquid combined inoculation: adopt batch mixer to turn, bacterium liquid and the pretreated raw material ratio by weight 1: 1000 is mixed, the bacterium liquid used in the present embodiment is bacillus cereus, Geobacillus stearothermophilus, aspergillus nidulans according to 1: 1: 1 bacteria liquid amass proportioning form composite bacteria liquid, bacteria containing amount is 1 × 10
12individual/ml:
(3) low temperature pyrogenation charing:
Turn the bank evenly and coning pile body, and every 1 hour, natural wind is passed into 15 minutes to heap body, make heap body inner a small amount of containing oxygen, be in double oxygen condition, the compound bacteria of the inoculation in material with the carbohydrate such as protein, grease, fat of easily degraded in material for nutrient source, be heat energy by metabolism, procreation etc. by organic chemical energy, make the temperature of heap body maintain 70 DEG C.(metabolism, procreation that body oxygen content only maintains microorganism is piled in this temperature and double oxygen, be heat energy by chemical energy, maintain heap temperature) condition under, cellulose in heap body, lignin and the organic matter pyrolysis charring gradually of not easily degrading, the specific area of material improves gradually.Utilize industrial glucose and urea to supplement week about and once maintain the heap internal microorganism metabolism Carbon and nitrogen sources necessary with procreation, supplement a moisture every other month, maintain moisture 45%, low temperature pyrogenation through August carbonizes, obtain the thick product of class charcoal, by adopting the charing of above-mentioned middle slow pyrolysis, the energy more less than fast pyrogenation consumption and produce more biological substance, and low temperature pyrogenation carbonization process produces Wu bioxin.
(4) pulverize: thick product is crushed to particle diameter 1mm;
(5) screen: adopt gravity screening, remove the non-class charcoal material of Large stone and large density in product after pulverizing, obtain class charcoal finished product.
Embodiment 3
For a preparation method for the class charcoal that heavy-metal contaminated soil is repaired, adopt following steps:
(1) pretreatment of raw material:
A, plastics, metal, the bone impurity removed in plant and animal residues, food market garbage or kitchen wet refuse;
Raw material after b, preliminary sorting enters disintegrating machine, and after fragmentation, the particle diameter of raw material is at 3cm;
Material after c, fragmentation enters squeezer, and after squeezing, the moisture content of material is 60%;
(2) material bacterium liquid combined inoculation: adopt batch mixer to turn, bacterium liquid and the pretreated raw material ratio by weight 1: 1000 is mixed, the bacterium liquid used in the present embodiment is bacillus cereus, Geobacillus stearothermophilus, aspergillus nidulans according to 1: 1: 1 bacteria liquid amass proportioning form composite bacteria liquid, bacteria containing amount is 9 × 10
12individual/ml;
(3) low temperature pyrogenation charing:
Turn the bank evenly and coning pile body, and every 1 hour, natural wind is passed into 15 minutes to heap body, make heap body inner a small amount of containing oxygen, be in double oxygen condition, the compound bacteria of the inoculation in material with the carbohydrate such as protein, grease, fat of easily degraded in material for nutrient source, be heat energy by metabolism, procreation etc. by organic chemical energy, make the temperature of heap body maintain 90 DEG C.(metabolism, procreation that body oxygen content only maintains microorganism is piled in this temperature and double oxygen, be heat energy by chemical energy, maintain heap temperature) condition under, cellulose in heap body, lignin and the organic matter pyrolysis charring gradually of not easily degrading, the specific area of material improves gradually.Utilize industrial glucose and urea to supplement week about and once maintain the heap internal microorganism metabolism Carbon and nitrogen sources necessary with procreation, supplement a moisture every other month, maintain moisture 60%, low temperature pyrogenation through December carbonizes, obtain the thick product of class charcoal, by adopting the charing of above-mentioned middle slow pyrolysis, the energy more less than fast pyrogenation consumption and produce more biological substance, and low temperature pyrogenation carbonization process produces Wu bioxin.
(4) pulverize: thick product is crushed to particle diameter 2mm;
(5) screen: adopt gravity screening, remove the non-class charcoal material of Large stone and large density in product after pulverizing, obtain class charcoal finished product.
Application example:
1, target soil: the application practice carrying out class charcoal on the soil after cadmium pollution, Cadmium in Soil content background value is 89.3 ~ 92mg/kg.
2, test area: 4 pieces of each about 50m of area
2contaminated land, numbering 1# respectively ~ 4# plot.
3, implementation method:
1) on 1 ~ 3 plot, by class charcoal equably cloth be sprinkled upon the surface of target soil.It is 1m that cloth spills density
2soil cloth spills 0.015m
3the class charcoal prepared by embodiment 2,4# does not arrange in plot, as a setting control group.
2) adopt artificial scarifying mode, class charcoal and the soil of test top layer, plot 30cm are turned evenly, the original place scarifying of 4# plot.
3) on 1# ~ 4# plot, plant giantreed, planting density is suitable.
4) in the 4 ~ May and 8 ~ 9 months of giantreed growth course, carry out cadmium content in test giantreed blade, data measured is as following table:
4, data analysis:
According to test the data obtained, wherein when 4 ~ May, the average cadmium content of giantreed blade of test group only has 58.0% of control group, and when 8 ~ September, the average cadmium content of giantreed blade of test group only has 56.6% of control group;
5, interpretation of result:
Result of the test shows: in the target soil of heavy metal cadmium, use class charcoal, effectively can reduce the migration of Cadium In Polluted Soil to organism, namely class charcoal can change the existing forms of Cadmium in Soil, make with the cadmium of the easy migration form of the instability such as soluble state, reduced the amount of heavy metal acid soluble state by class charcoal adsorption and ion-exchange, complexing, make metal ion be stabilized in the lattice of class charcoal chemical constitution, effectively significantly reduce heavy metal to the harm of organism.
Claims (6)
1. for a preparation method for the class charcoal of heavy-metal contaminated soil reparation, it is characterized in that, the method adopts following steps:
(1) pretreatment of raw material:
Plastics, metal, bone impurity in a, removal raw material;
Raw material after b, preliminary sorting enters disintegrating machine, and after fragmentation, the particle diameter of raw material is at 2 ~ 3cm;
Material after c, fragmentation enters squeezer, and after squeezing, the moisture content of material is 45% ~ 60%;
(2) material bacterium liquid combined inoculation: adopt batch mixer to turn, by bacterium liquid and pretreated raw material by weight 1: 1000 ratio mix;
(3) low temperature pyrogenation charing:
Turn the bank evenly and coning pile body, and natural wind is passed to heap body, make heap body inner a small amount of containing oxygen, be in double oxygen condition, the temperature of heap body maintains 70 ~ 90 DEG C, supplements week about and once maintains the Carbon and nitrogen sources that heap internal microorganism is metabolic and procreation is necessary, supplement a moisture every other month, low temperature pyrogenation through 8 ~ December carbonizes, and obtains the thick product of class charcoal;
(4) pulverize: thick product is crushed to particle diameter 1 ~ 2mm;
(5) screen: the non-class charcoal material removing Large stone and large density in product after pulverizing through gravity screening, obtains class charcoal finished product.
2. the preparation method of a kind of class charcoal for heavy-metal contaminated soil reparation according to claim 1, it is characterized in that, described raw material is one or more in plant and animal residues, food market garbage or kitchen wet refuse.
3. the preparation method of a kind of class charcoal for heavy-metal contaminated soil reparation according to claim 1, it is characterized in that, described bacterium liquid is bacillus cereus, Geobacillus stearothermophilus, aspergillus nidulans according to 1: 1: 1 bacteria liquid amass proportioning form composite bacteria liquid, bacteria containing amount is 1-9 × 10
12individual/ml.
4. the preparation method of a kind of class charcoal for heavy-metal contaminated soil reparation according to claim 1, is characterized in that, pass into natural wind 15 minutes in step (3) every 1 hour to heap body.
5. the preparation method of a kind of class charcoal for heavy-metal contaminated soil reparation according to claim 1, it is characterized in that, the Carbon and nitrogen sources supplemented in step (3) is industrial glucose and urea.
6. the preparation method of a kind of class charcoal for heavy-metal contaminated soil reparation according to claim 1, is characterized in that, supplement a moisture every other month in step (3), maintain moisture 45% ~ 60%.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562428A (en) * | 2015-08-11 | 2016-05-11 | 济南大学 | Phenanthrene-contaminated soil treatment method |
| CN105598158A (en) * | 2016-01-28 | 2016-05-25 | 中南大学 | Phosphorus-based biochar material, and preparation and application thereof |
| CN105689374A (en) * | 2016-01-28 | 2016-06-22 | 中南大学 | Application of phosphorus base charcoal material to remediation of lead contaminated soil |
| CN105776796A (en) * | 2016-04-11 | 2016-07-20 | 浙江大学 | Method of reducing heavy metal bio-availability through pig manure pyrolysis and biochar application of pig manure |
| CN105771901A (en) * | 2016-05-27 | 2016-07-20 | 重庆市科学技术研究院 | Method for preparing adsorbing material from plastic or waste plastic through carbonization |
| CN106824102A (en) * | 2017-03-15 | 2017-06-13 | 南京师范大学 | A kind of efficient absorption heavy metal ion Cd2+Dissolved Organic Matter dipping charcoal and its preparation method and application |
| CN107597060A (en) * | 2017-08-23 | 2018-01-19 | 新疆光合元生物科技有限公司 | Adsorbent based on photosynthetic Bacillus processing heavy metal-polluted soil and preparation method thereof |
| CN108393346A (en) * | 2018-05-14 | 2018-08-14 | 东华大学 | A kind of method that calper calcium peroxide-charcoal repairs agricultural soil |
| CN111171830A (en) * | 2019-12-18 | 2020-05-19 | 浙江慧丰环保科技有限公司 | Passivator for soil heavy metal pollution treatment and preparation method thereof |
| CN111423280A (en) * | 2019-01-08 | 2020-07-17 | 湖南农业大学 | 3D-structure biochar fertilizer and preparation method and application thereof |
| CN112619615A (en) * | 2020-12-16 | 2021-04-09 | 中国矿业大学(北京) | Preparation method of biochar-microorganism composite material and method for treating tailing wastewater |
| CN112774633A (en) * | 2021-01-15 | 2021-05-11 | 复旦大学 | Method for preparing biochar from wet garbage and application of biochar |
| CN115582418A (en) * | 2022-10-09 | 2023-01-10 | 西南交通大学 | Multifunctional repairing material for heavy metal contaminated soil in mining area and preparation method thereof |
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Cited By (15)
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| CN105562428A (en) * | 2015-08-11 | 2016-05-11 | 济南大学 | Phenanthrene-contaminated soil treatment method |
| CN105598158A (en) * | 2016-01-28 | 2016-05-25 | 中南大学 | Phosphorus-based biochar material, and preparation and application thereof |
| CN105689374A (en) * | 2016-01-28 | 2016-06-22 | 中南大学 | Application of phosphorus base charcoal material to remediation of lead contaminated soil |
| CN105776796A (en) * | 2016-04-11 | 2016-07-20 | 浙江大学 | Method of reducing heavy metal bio-availability through pig manure pyrolysis and biochar application of pig manure |
| CN105771901B (en) * | 2016-05-27 | 2018-06-12 | 重庆市科学技术研究院 | The method for preparing sorbing material using plastics or waste plastic charing |
| CN105771901A (en) * | 2016-05-27 | 2016-07-20 | 重庆市科学技术研究院 | Method for preparing adsorbing material from plastic or waste plastic through carbonization |
| CN106824102B (en) * | 2017-03-15 | 2019-09-24 | 南京师范大学 | A kind of efficient absorption heavy metal ion Cd2+Dissolved Organic Matter dipping charcoal and its preparation method and application |
| CN106824102A (en) * | 2017-03-15 | 2017-06-13 | 南京师范大学 | A kind of efficient absorption heavy metal ion Cd2+Dissolved Organic Matter dipping charcoal and its preparation method and application |
| CN107597060A (en) * | 2017-08-23 | 2018-01-19 | 新疆光合元生物科技有限公司 | Adsorbent based on photosynthetic Bacillus processing heavy metal-polluted soil and preparation method thereof |
| CN108393346A (en) * | 2018-05-14 | 2018-08-14 | 东华大学 | A kind of method that calper calcium peroxide-charcoal repairs agricultural soil |
| CN111423280A (en) * | 2019-01-08 | 2020-07-17 | 湖南农业大学 | 3D-structure biochar fertilizer and preparation method and application thereof |
| CN111171830A (en) * | 2019-12-18 | 2020-05-19 | 浙江慧丰环保科技有限公司 | Passivator for soil heavy metal pollution treatment and preparation method thereof |
| CN112619615A (en) * | 2020-12-16 | 2021-04-09 | 中国矿业大学(北京) | Preparation method of biochar-microorganism composite material and method for treating tailing wastewater |
| CN112774633A (en) * | 2021-01-15 | 2021-05-11 | 复旦大学 | Method for preparing biochar from wet garbage and application of biochar |
| CN115582418A (en) * | 2022-10-09 | 2023-01-10 | 西南交通大学 | Multifunctional repairing material for heavy metal contaminated soil in mining area and preparation method thereof |
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