CN110976497A - Method for treating polluted soil of waste industrial and mining sites - Google Patents
Method for treating polluted soil of waste industrial and mining sites Download PDFInfo
- Publication number
- CN110976497A CN110976497A CN201911304961.0A CN201911304961A CN110976497A CN 110976497 A CN110976497 A CN 110976497A CN 201911304961 A CN201911304961 A CN 201911304961A CN 110976497 A CN110976497 A CN 110976497A
- Authority
- CN
- China
- Prior art keywords
- curing
- soil
- industrial
- solid
- mining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating polluted soil in a waste industrial and mining site, and belongs to the technical field of soil pollution remediation. The invention relates to a method for treating polluted soil of a waste industrial and mining site, which comprises the following steps: 1) extracting the polluted soil of the abandoned industrial and mining field, leaching the polluted soil with leacheate, and uniformly mixing to obtain slurry; 2) carrying out solid-liquid separation on the slurry obtained in the step 1) to obtain a separation liquid and solid slag; 3) uniformly mixing the solid slag obtained in the step 2) with a curing agent, curing for 10-15 days, and backfilling to a waste industrial and mining site. The method comprises the steps of leaching the polluted soil by using a leaching solution, enabling most heavy metal elements in the polluted soil to enter a liquid phase, then carrying out solid-liquid separation, greatly reducing the content of heavy metals in the separated solid slag, and then curing and curing the solid slag with a curing agent, so that the hazard of the solid slag is reduced to the minimum, the curing and curing time is greatly reduced, and the repair period is shortened.
Description
Technical Field
The invention relates to the technical field of soil pollution remediation, in particular to a method for treating polluted soil in abandoned industrial and mining sites.
Background
In recent years, with the acceleration of urbanization and the shortage of construction land, the re-development and utilization of polluted fields are urgent, and more abandoned industrial and mining fields are repaired to be used as construction land.
At present, the heavy metal polluted site is repaired by adopting a mode of excavating and transporting polluted soil and then filling new soil. In order to avoid the pollution of the new soil by the upward permeation of deep pollution elements, the method generally has the advantages of large excavation depth, high construction cost, large demand on the new soil and high transportation cost of the new soil. The polluted soil is dug out, solidified or stabilized, and then backfilled. The mode has lower transportation cost, and the solidified soil also has a certain barrier effect on deep pollution elements, but in order to fully reduce heavy metal pollution, the mode needs a large amount of curing agents and very long curing time for treatment, so that the repair period is prolonged.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for treating the polluted soil in the abandoned industrial and mining sites, so as to solve the problem of long restoration period in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for treating polluted soil of waste industrial and mining sites comprises the following steps:
1) extracting the polluted soil of the abandoned industrial and mining field, leaching the polluted soil with leacheate, and uniformly mixing to obtain slurry;
2) carrying out solid-liquid separation on the slurry obtained in the step 1) to obtain a separation liquid and solid slag;
3) uniformly mixing the solid slag obtained in the step 2) with a curing agent, curing for 10-15 days, and backfilling to a waste industrial and mining site.
By adopting the technical scheme, the polluted soil is leached by the leacheate firstly, so that most heavy metal elements in the polluted soil enter the liquid phase, then solid-liquid separation is carried out, and the liquid phase and the solid phase are treated respectively. Heavy metal elements in the polluted soil are enriched in the separation liquid, the content of heavy metals in the separated solid material slag is greatly reduced, the solid material slag is cured and cured with the curing agent, a small amount of heavy metal elements remained in the material slag are cured, the hazard of the heavy metal elements is reduced to the minimum, the curing and curing time is greatly reduced, and the repair period is shortened. Because the heavy metal content in the solid slag is lower, the dosage of the curing agent required during curing treatment is also greatly reduced. The method of the invention treats the heavy metal elements in two parts, and the separation liquid enriched with the heavy metal elements is more convenient for subsequent treatment, thereby being convenient for recovering the heavy metal elements therein.
The invention is further configured to: the mass ratio of the polluted soil to the leacheate in the step 1) is 1 (3-15).
By adopting the technical scheme, the heavy metal substances in the polluted soil are dispersed in the soil particles and are not easy to wash out, and the invention adopts more leacheate, so that the leacheate can be conveniently and fully mixed with the soil particles, and the leacheate can be favorably used for soaking the soil particles, so that the heavy metal elements in the soil particles can enter the leacheate as much as possible, and the separation is convenient.
The invention is further configured to: the leacheate in the step 1) is a mixed aqueous solution of acetic acid, citric acid and oxalic acid, and the mass fraction of each component in the mixed aqueous solution is as follows: 3-7% of acetic acid, 8-15% of citric acid and 2-5% of oxalic acid.
By adopting the technical scheme, the leacheate disclosed by the invention adopts the mixing effect of three acids, utilizes different types of organic acids, can perform complexing effect on heavy metal elements in soil particles, can replace part of heavy metal ions in the soil particles by utilizing hydrogen ions, has different effects on different types of heavy metal ions, such as better effect of citric acid on lead and cadmium, better effect of acetic acid on zinc, and synergistic effect of the three acids, can completely leach different types of heavy metal elements in polluted soil as far as possible, and is also suitable for treating more types of polluted soil. In addition, the three organic acids adopted by the invention are easy to degrade, and do not generate other environmental problems. The mass fractions of the components in the mixed solution are calculated according to pure acetic acid, citric acid and oxalic acid.
The invention is further configured to: the temperature when the mixture is uniformly mixed in the step 1) is 50-90 ℃.
By adopting the technical scheme, the heating is carried out during mixing, the reaction between heavy metal elements in the soil and the leacheate is facilitated, the control temperature is not too high, and the reduction of the leaching effect caused by the excessive evaporation of water in the leacheate can be avoided.
The invention is further configured to: adding leacheate into the solid material slag obtained in the step 2), uniformly mixing, then carrying out solid-liquid separation to obtain separation liquid and solid material slag, and combining the separation liquid obtained twice.
By adopting the technical scheme, the solid-liquid separation is carried out again after the leacheate is added to the solid after the solid-liquid separation, so that the elution rate of heavy metals in the soil can be improved, more heavy metal elements are promoted to enter a liquid phase, the using amount of a curing agent in subsequent solid-phase treatment is reduced, and the harm degree of the solid-phase treated slag to the environment is fully reduced.
The invention is further configured to: evaporating and concentrating the separated liquid in the step 2), condensing the evaporated steam, and using the obtained condensate to prepare the leacheate.
Through adopting above-mentioned technical scheme, carry out the evaporative concentration with the parting liquid, the gaseous part that the evaporation came out does not contain heavy metal element basically, can recycle after the condensation, and further concentrate heavy metal element in the evaporative concentration liquid, the subsequent processing of being convenient for. Moreover, the liquid obtained by recondensing the evaporated gas accounts for the vast majority of the separation liquid, the volume of the residual concentrated liquid is very small, the requirement on equipment and the like during subsequent treatment is low, and the treatment is more convenient.
The invention is further configured to: in the step 3), 50-200kg of curing agent is added into per cubic meter of solid slag.
By adopting the technical scheme, after the solid-liquid separated material slag is mixed with the curing agent, the harm of heavy metal elements in the material slag can be fully reduced, and the cured material slag can be backfilled, so that an originally polluted industrial and mining site is changed into a construction site or is further processed to be used as a planting site.
The invention is further configured to: in the step 3), the curing agent is a mixed curing agent obtained by mixing cement, fly ash and quicklime in a mass ratio of 5:2: 1.
By adopting the technical scheme, the curing agent disclosed by the invention adopts multiple components to be matched, so that the influence of heavy metal elements in the cured material slag can be fully reduced, and the safety after backfilling is improved.
The invention is further configured to: and 3) uniformly mixing the solid slag and the curing agent in the step 3) by stirring for 0.5-2h at the stirring speed of 50-100 rpm.
Through adopting above-mentioned technical scheme, set up the churning time and the stirring rotational speed of solid material sediment and curing agent, be favorable to making material sediment and curing agent intensive mixing, promoted subsequent effect of curing.
The invention is further configured to: and 3) detecting the content of heavy metal in the material slag after curing and curing in the step 3), and curing for 7-10 days after uniformly mixing the cured solid material slag and the curing agent if the content of heavy metal is lower than a set value.
By adopting the technical scheme, the material slag after being oxidized and cured is cured again, maintained and cured, so that the heavy metal elements in the treated material slag can not be exuded conveniently, and the absolute safety to the environment is ensured after backfilling.
In conclusion, the invention has the following beneficial effects:
firstly, the treatment effect is good. The contaminated soil is leached and then subjected to solid-liquid separation, and the separated liquid and solid are respectively treated in different modes, so that compared with single mode treatment, the removal rate of heavy metal elements is improved, and the safety of the treated solid is also improved.
Secondly, the processing efficiency is high. The liquid and the solid after solid-liquid separation after the polluted soil is washed are respectively treated, two routes of treatment processes can be simultaneously implemented, the overall treatment efficiency is improved, and the treatment period is shortened.
Thirdly, saving equipment. Because most heavy metal elements in the polluted soil enter the separated liquid, the liquid can be treated by adopting a continuous process without adopting large-scale equipment. Furthermore, the invention carries out evaporation concentration on the separation liquid, and only processes the concentrated liquid, thereby further reducing the requirement on equipment scale.
Fourthly, raw materials are saved. The invention recovers the evaporated liquid to prepare the leacheate, thereby reducing the consumption of raw materials. After solid-liquid separation, only solid slag with low heavy metal content is solidified, and the using amount of a curing agent is also reduced.
Drawings
FIG. 1 is a process flow chart of the method for treating the contaminated soil in the abandoned industrial and mining sites.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
In the method for treating the polluted soil of the abandoned industrial and mining sites, the polluted soil in the step 1) is crushed and screened after being extracted. The screening is through a 2mm screen. And crushing and screening the screened residues, and combining the undersize products obtained in the two times to obtain the polluted soil to be treated. The leaching time in the step 1) is 4-12min, and the uniform mixing is carried out for 2-5 h. The step 1) of uniformly mixing is to stir in a rotary drum. The solid-liquid separation in the step 1) is centrifugal separation, and the rotating speed is 2000-. In the invention, uncondensed gas is collected after the separation liquid obtained by solid-liquid separation after leaching is evaporated and concentrated and is discharged after being treated by lime water.
The leacheate can be commonly used in the prior art, such as oxalic acid solution, citric acid solution or diethyltriaminepentaacetic acid, and the mass concentration of the leacheate is 5-12%. The following leachates may also be employed: the leacheate comprises the following components in percentage by mass: 3-7% of acetic acid, 8-15% of citric acid and 2-5% of oxalic acid.
The excavation depth of the contaminated soil of the present invention may be determined depending on the degree of contamination. The polluted soil is heavy metal polluted soil, and the heavy metal is at least one of Pb, Zn, Cd and Cu.
The treatment system adopted by the method for treating the polluted soil of the waste industrial and mining sites comprises a crusher, a screening machine and a rotary drum which are sequentially connected, wherein a material outlet of the rotary drum is connected with a buffer tank, an outlet of the buffer tank is connected with a solid-liquid separation device, a liquid phase outlet of the solid-liquid separation device is connected with an evaporator, a solid phase outlet is connected with a stirring tank, and a curing agent feeding port is arranged on the stirring tank. The rotary drum comprises a drum body, wherein an leacheate spraying device is arranged in the drum body and is used for spraying leacheate to materials in the rotary drum. The rotary drum body is also provided with a heating device for heating the materials in the drum body. The gas outlet of the evaporator is connected with a condenser, the liquid outlet of the condenser is connected with an eluent preparation container, and the eluent preparation container is connected with an eluent spraying device of the rotary drum.
Example 1
As shown in fig. 1, the method for treating contaminated soil in a waste industrial and mining site of the embodiment includes the following steps:
1) excavating polluted soil of the waste industrial and mining sites, crushing the polluted soil by a crusher, sieving the polluted soil by a nylon sieve with the aperture of 2mm, and separating impurities such as stones, large particles and the like; crushing the screen residues again, and then screening by using a nylon screen with the aperture of 2 mm; and combining the undersize products obtained in the two steps to obtain the soil to be treated.
2) Adding soil to be treated into a rotary drum, starting the rotary drum to stir the soil to be treated, and simultaneously starting a heating device to heat the soil to be treated in the rotary drum in the rotating process of the rotary drum, so that the temperature in the rotary drum is raised to 70 ℃ (the detection temperature of air in the rotary drum), and spraying leacheate on the soil while the soil is stirred in the rotary drum in a rolling manner, so that the soil and the leacheate are uniformly mixed; spraying for 6min, continuously stirring and mixing for 3h after spraying, and stirring and mixing to obtain the slurry. The mass ratio of the soil to the leacheate is 1: 8. The leacheate is an oxalic acid solution with the mass fraction of 5%.
3) And after stirring and mixing are finished, discharging the slurry, sending the slurry into a buffer tank, sending the slurry in the buffer tank into a horizontal centrifuge by a slurry pump, carrying out centrifugal separation at the rotating speed of 5000 r/min, sending the separated solid slag into a slag tank, and discharging a liquid phase into a water tank for collection.
4) And (3) conveying the water in the water tank into an evaporator through a lifting pump, heating to evaporate and concentrate the liquid, condensing the evaporated steam, collecting condensate, conveying the condensate into a leacheate preparation tank to be used as water during preparation of the leacheate, discharging the concentrated solution after evaporation and concentration, cooling, and recovering heavy metal elements.
And (2) conveying the solid slag in the slag pool into a stirring pool, adding a curing agent, wherein the curing agent is a mixed curing agent obtained by mixing cement, fly ash and quick lime in a mass ratio of 5:2:1, the cement is ordinary portland cement, the fly ash is I-grade fly ash, and the addition amount of the curing agent is that 200kg of the curing agent is correspondingly added into each cubic meter of the solid slag. Adding the curing agent, stirring for 2h, uniformly mixing, wherein the stirring speed is 20r/min, discharging the material residues, conveying to a storage yard, stacking, curing and curing for 14 days, and performing ventilation and anti-seepage treatment in the curing and curing process. And (4) sampling after curing and curing, and detecting the leaching amount of the heavy metal by using a TCLP toxicity leaching method. And when the leaching amount of the heavy metal is lower than a set value, conveying the cured solid slag back to the abandoned industrial and mining site for backfilling.
And when the leaching amount of the heavy metal is higher than the set value, adding the mixed curing agent again, stirring and mixing uniformly, curing for 8 days, sampling, detecting the leaching amount of the heavy metal by using a TCLP toxicity leaching method, and repeating the steps of adding the mixed curing agent again, curing and curing when the leaching amount of the heavy metal is higher than the set value until the leaching amount of the heavy metal is lower than the set value, and conveying the cured solid slag back to the abandoned industrial and mining site for backfilling.
Example 2
The method for treating the polluted soil of the abandoned industrial and mining sites comprises the following steps:
1) excavating polluted soil of the waste industrial and mining sites, crushing the polluted soil by a crusher, sieving the polluted soil by a nylon sieve with the aperture of 2mm, and separating impurities such as stones, large particles and the like; crushing the screen residues again, and then screening by using a nylon screen with the aperture of 2 mm; and combining the undersize products obtained in the two steps to obtain the soil to be treated.
2) Adding soil to be treated into a rotary drum, starting the rotary drum to stir the soil to be treated, and simultaneously starting a heating device to heat the soil to be treated in the rotary drum in the rotating process of the rotary drum, so that the temperature in the rotary drum is raised to 50 ℃ (the detection temperature of air in the rotary drum), and spraying leacheate on the soil while the soil is stirred in the rotary drum in a rolling manner, so that the soil and the leacheate are uniformly mixed; the leaching time is 10min, stirring and mixing are continued for 2h after leaching, and slurry is obtained after stirring. The mass ratio of the soil to the leacheate is 1: 15. The leacheate is a citric acid solution with the mass fraction of 5%.
3) And after stirring and mixing are finished, discharging the slurry, sending the slurry into a buffer pool, sending the slurry in the buffer pool into a horizontal centrifuge by a slurry pump, carrying out centrifugal separation at the rotating speed of 2000 rpm, sending the separated solid slag into a slag pool, and discharging a liquid phase into a water pool for collection.
4) The water in the water tank is sent into an evaporator through a lifting pump, the liquid is evaporated and concentrated by heating, the evaporated steam is condensed, the condensed liquid is collected and enters the water tank, part of the water in the water tank is sent into a leacheate preparation tank to be used as water in the preparation of the leacheate, the other part of the water is sent into a slag feeding tank, the material slag after centrifugal separation is sent into a horizontal centrifuge again for centrifugal separation after stirring, the material slag after centrifugal separation is sent into the slag feeding tank again, and the separated separation liquid is sent into the evaporator. And discharging the concentrated solution after evaporation concentration, cooling, and recovering heavy metal elements.
And (2) conveying the solid slag in the slag pool into a stirring pool, adding a curing agent, wherein the curing agent is a mixed curing agent obtained by mixing cement, fly ash and quick lime in a mass ratio of 5:2:1, the cement is ordinary portland cement, the fly ash is I-grade fly ash, and the addition amount of the curing agent is 50kg of the curing agent correspondingly added to each cubic meter of the solid slag. Adding the curing agent, stirring for 0.5h, uniformly mixing at the stirring speed of 50r/min, discharging the material residues, conveying to a storage yard, stacking, curing and curing for 10 days, and performing ventilation and anti-seepage treatment in the curing and curing process. And (4) sampling after curing and curing, and detecting the leaching amount of the heavy metal by using a TCLP toxicity leaching method. And when the leaching amount of the heavy metal is lower than a set value, conveying the cured solid slag back to the abandoned industrial and mining site for backfilling.
And when the leaching amount of the heavy metal is higher than the set value, adding the mixed curing agent again, stirring and mixing uniformly, curing for 10 days, sampling, detecting the leaching amount of the heavy metal by using a TCLP toxicity leaching method, and when the leaching amount of the heavy metal is higher than the set value, repeating the steps of adding the mixed curing agent again and curing until the leaching amount of the heavy metal is lower than the set value, and conveying the cured solid slag back to the abandoned industrial and mining site for backfilling.
Example 3
The method for treating the polluted soil of the abandoned industrial and mining sites comprises the following steps:
1) excavating polluted soil of the waste industrial and mining sites, crushing the polluted soil by a crusher, sieving the polluted soil by a nylon sieve with the aperture of 2mm, and separating impurities such as stones, large particles and the like; crushing the screen residues again, and then screening by using a nylon screen with the aperture of 2 mm; and combining the undersize products obtained in the two steps to obtain the soil to be treated.
2) Adding soil to be treated into a rotary drum, starting the rotary drum to stir the soil to be treated, and simultaneously starting a heating device to heat the soil to be treated in the rotary drum in the rotating process of the rotary drum, so that the temperature in the rotary drum is raised to 85 ℃ (the detection temperature of air in the rotary drum), and spraying leacheate on the soil while the soil is stirred in the rotary drum in a rolling manner, so that the soil and the leacheate are uniformly mixed; the leaching time is 4min, stirring and mixing are continued for 5h after leaching, and slurry is obtained after stirring. The mass ratio of the soil to the leacheate is 1: 3. The adopted leacheate comprises the following components in percentage by mass: 5% of acetic acid, 12% of citric acid and 3% of oxalic acid.
3) And after stirring and mixing are finished, discharging the slurry, sending the slurry into a buffer pool, sending the slurry in the buffer pool into a horizontal centrifuge by a slurry pump, carrying out centrifugal separation at the rotating speed of 3000 r/m, sending the separated solid slag into a slag pool, and discharging a liquid phase into a water pool for collection.
4) And (3) conveying the water in the water tank into an evaporator through a lifting pump, heating to evaporate and concentrate the liquid, condensing the evaporated steam, collecting condensate, conveying the condensate into a leacheate preparation tank to be used as water during preparation of the leacheate, discharging the concentrated solution after evaporation and concentration, cooling, and recovering heavy metal elements.
And (2) conveying the solid slag in the slag pool into a stirring pool, adding a curing agent, wherein the curing agent is a mixed curing agent obtained by mixing cement, fly ash and quick lime in a mass ratio of 5:2:1, the cement is ordinary portland cement, the fly ash is I-grade fly ash, and the addition amount of the curing agent is that 100kg of the curing agent is correspondingly added into each cubic meter of the solid slag. Adding the curing agent, stirring for 1h, uniformly mixing at the stirring speed of 30r/min, discharging the material residues, conveying to a storage yard, stacking, curing and curing for 12 days, and performing ventilation and anti-seepage treatment in the curing and curing process. And (4) sampling after curing and curing, and detecting the leaching amount of the heavy metal by using a TCLP toxicity leaching method. And when the leaching amount of the heavy metal is lower than a set value, conveying the cured solid slag back to the abandoned industrial and mining site for backfilling.
And when the leaching amount of the heavy metal is higher than the set value, adding the mixed curing agent again, stirring and mixing uniformly, curing for 7 days, sampling, detecting the leaching amount of the heavy metal by using a TCLP toxicity leaching method, and when the leaching amount of the heavy metal is higher than the set value, repeating the steps of adding the mixed curing agent again and curing until the leaching amount of the heavy metal is lower than the set value, and conveying the cured solid slag back to the abandoned industrial and mining site for backfilling.
In other preferred embodiments, the gas which is not condensed during evaporation and concentration is collected and then discharged after being treated with lime water.
Test examples
The soil to be treated (before treatment) and the solid residue after final curing and aging (after treatment) in examples 1 to 3 were subjected to leaching test using soil environmental quality standards (GB15618-1995) to determine the heavy metal content (leaching amount) in the soil, and the results are shown in the following table.
TABLE 1 heavy Metal leaching amounts of soil to be treated and cured solid slag in examples 1 to 3
According to the above table, compared with the soil sample before treatment, the solid slag treated by the method for treating the polluted soil of the abandoned industrial and mining sites has the advantages that the leaching amount of heavy metals is greatly reduced, and the standard of the land used by residents in the land remediation of the heavy metal polluted sites can be achieved.
Claims (10)
1. A method for treating polluted soil of waste industrial and mining sites is characterized by comprising the following steps: the method comprises the following steps:
1) extracting the polluted soil of the abandoned industrial and mining field, leaching the polluted soil with leacheate, and uniformly mixing to obtain slurry;
2) carrying out solid-liquid separation on the slurry obtained in the step 1) to obtain a separation liquid and solid slag;
3) uniformly mixing the solid slag obtained in the step 2) with a curing agent, curing for 10-15 days, and backfilling to a waste industrial and mining site.
2. The method for treating contaminated soil of abandoned industrial and mining sites according to claim 1, wherein: the mass ratio of the polluted soil to the leacheate in the step 1) is 1 (3-15).
3. The method for treating the contaminated soil of the abandoned industrial and mining site according to claim 2, wherein: the leacheate in the step 1) is a mixed aqueous solution of acetic acid, citric acid and oxalic acid, and the mass fraction of each component in the mixed aqueous solution is as follows: 3-7% of acetic acid, 8-15% of citric acid and 2-5% of oxalic acid.
4. The method for treating contaminated soil of abandoned industrial and mining sites according to claim 1, wherein: the temperature when the mixture is uniformly mixed in the step 1) is 50-90 ℃.
5. The method for treating contaminated soil of abandoned industrial and mining sites according to any one of claims 1 to 4, wherein: adding leacheate into the solid material slag obtained in the step 2), uniformly mixing, then carrying out solid-liquid separation to obtain separation liquid and solid material slag, and combining the separation liquid obtained twice.
6. The method for treating contaminated soil of abandoned industrial and mining sites according to any one of claims 1 to 4, wherein: evaporating and concentrating the separated liquid in the step 2), condensing the evaporated steam, and using the obtained condensate to prepare the leacheate.
7. The method for treating the contaminated soil of the abandoned industrial and mining site according to any one of claims 1, wherein: in the step 3), 50-200kg of curing agent is added into per cubic meter of solid slag.
8. The method for treating contaminated soil of abandoned industrial and mining sites according to claim 7, wherein: in the step 3), the curing agent is a mixed curing agent obtained by mixing cement, fly ash and quicklime in a mass ratio of 5:2: 1.
9. The method for treating contaminated soil of abandoned industrial and mining sites according to claim 1, wherein: and 3) uniformly mixing the solid slag and the curing agent in the step 3) by stirring for 0.5-2h at the stirring speed of 20-50 rpm.
10. The method for treating contaminated soil of abandoned industrial and mining sites according to claim 1, wherein: and 3) detecting the content of heavy metal in the material slag after curing and curing in the step 3), and curing for 7-10 days after uniformly mixing the cured solid material slag and the curing agent if the content of heavy metal is lower than a set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304961.0A CN110976497A (en) | 2019-12-17 | 2019-12-17 | Method for treating polluted soil of waste industrial and mining sites |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304961.0A CN110976497A (en) | 2019-12-17 | 2019-12-17 | Method for treating polluted soil of waste industrial and mining sites |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110976497A true CN110976497A (en) | 2020-04-10 |
Family
ID=70094888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911304961.0A Pending CN110976497A (en) | 2019-12-17 | 2019-12-17 | Method for treating polluted soil of waste industrial and mining sites |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110976497A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190698A (en) * | 2014-08-21 | 2014-12-10 | 中国科学院南京土壤研究所 | Method for restoring clayed soil of high-load heavy metal polluted site |
| CN104289515A (en) * | 2014-10-22 | 2015-01-21 | 天津生态城环保有限公司 | Heavy metal contaminated soil washing method |
| CN105855283A (en) * | 2016-06-15 | 2016-08-17 | 中科院广州化灌工程有限公司 | Treatment method for heavy metal contaminated soil |
| CN106433653A (en) * | 2016-09-22 | 2017-02-22 | 北京新源环境有限公司 | Composite eluting agent for restoring Cd and Pb contaminated soil and application method thereof |
| CN107214187A (en) * | 2017-07-12 | 2017-09-29 | 浙江省农业科学院 | Cd administering method and its application in field soil |
| CN107365585A (en) * | 2016-05-12 | 2017-11-21 | 南京凯杰环境技术有限公司 | A kind of environmentally friendly cadmium metal contaminated soil eluent and preparation method thereof |
-
2019
- 2019-12-17 CN CN201911304961.0A patent/CN110976497A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190698A (en) * | 2014-08-21 | 2014-12-10 | 中国科学院南京土壤研究所 | Method for restoring clayed soil of high-load heavy metal polluted site |
| CN104289515A (en) * | 2014-10-22 | 2015-01-21 | 天津生态城环保有限公司 | Heavy metal contaminated soil washing method |
| CN107365585A (en) * | 2016-05-12 | 2017-11-21 | 南京凯杰环境技术有限公司 | A kind of environmentally friendly cadmium metal contaminated soil eluent and preparation method thereof |
| CN105855283A (en) * | 2016-06-15 | 2016-08-17 | 中科院广州化灌工程有限公司 | Treatment method for heavy metal contaminated soil |
| CN106433653A (en) * | 2016-09-22 | 2017-02-22 | 北京新源环境有限公司 | Composite eluting agent for restoring Cd and Pb contaminated soil and application method thereof |
| CN107214187A (en) * | 2017-07-12 | 2017-09-29 | 浙江省农业科学院 | Cd administering method and its application in field soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10118182B2 (en) | Incineration byproduct processing and methods | |
| CN106282585B (en) | A kind of detoxification classification resource utilization method of domestic garbage incineration flyash | |
| CN103316907B (en) | Heavy-metal-polluted site soil leaching remediation method and device | |
| CN105268737B (en) | Heavy metal contaminated soil remediation equipment and remediation process thereof | |
| Tränkler et al. | Environmental impact of demolition waste—an overview on 10 years of research and experience | |
| CN105170307B (en) | Red-mud citric acid dealkalizing technique | |
| CN101306425B (en) | Electrolytic manganese slag comprehensive utilization technique | |
| US20120298562A1 (en) | Ash processing and metals recovery systems and methods | |
| EP0909335A1 (en) | Treatment of fly ash/apc residues including lead salt recovery | |
| CN106166560A (en) | A kind of processing method of waste cathode carbon block | |
| CN105152448B (en) | A kind of processing method for the acid water containing arsenic that flue gas during smelting is produced | |
| CN104609443A (en) | Method and equipment for extracting potassium salt from sintering machine head electroprecipitating dust in metallurgical industry | |
| CN103555338A (en) | Method and eluting agent for joint treatment of lead-zinc pollution by surfactant and chelating agent | |
| CN205270326U (en) | Pollute soil eluting repair system | |
| CN113736469A (en) | Leaching agent suitable for high-concentration arsenic-antimony composite polluted soil and preparation and application thereof | |
| CN110950480A (en) | Praseodymium oxide production waste liquid recovery treatment method | |
| Wang et al. | Behavior and mechanism of low-concentration rare earth ions precipitated by the microbial humic-like acids | |
| CN110976497A (en) | Method for treating polluted soil of waste industrial and mining sites | |
| CN111334673B (en) | Method for selectively recovering antimony, arsenic and alkali from arsenic-alkali residue | |
| CN204338563U (en) | A kind of stabilizing treatment apparatus for arsenic slag | |
| CN204434301U (en) | Metallurgy industry sintering machine head end electro-precipitating dust extracts the equipment of sylvite | |
| CN109201727B (en) | Soil leacheate and using method and equipment thereof | |
| CN113651485B (en) | Method for removing heavy metals in water body | |
| Zhang et al. | Recovery of potassium chloride from blast furnace flue dust | |
| CN103342430B (en) | Treatment method for extra-high-concentration acid waste liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200410 |
|
| RJ01 | Rejection of invention patent application after publication |