CN106147781A - A kind of preparation method for restoration of soil polluted by heavy metal curing agent - Google Patents
A kind of preparation method for restoration of soil polluted by heavy metal curing agent Download PDFInfo
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- CN106147781A CN106147781A CN201610568555.5A CN201610568555A CN106147781A CN 106147781 A CN106147781 A CN 106147781A CN 201610568555 A CN201610568555 A CN 201610568555A CN 106147781 A CN106147781 A CN 106147781A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
-
- 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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3042—Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent
-
- 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
- C09K2101/00—Agricultural use
-
- 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
- C09K2103/00—Civil engineering use
Abstract
The invention discloses a kind of preparation method for restoration of soil polluted by heavy metal curing agent, belong to soil-solidified-agent preparing technical field.The present invention is size-reduced by sepiolite, sieve and soak with mixed in hydrochloric acid after processing, filter residue after then rinsing is dried, prepare acid modified meerschaum, soak with sodium hydroxide solution after again banana skin being made graininess, immersion filtered filtration residue is rinsed and dried, then prepare banana skin activated carbon with Muffle furnace roasting, again by acid modified meerschaum, banana skin activated carbon, red soil, hydroxyapatite, alundum (Al2O3) powder and cow dung stir the mixture made and perlite powder, sodium carbonate, zeolite, sodium alginate, methyl silicon sodium alcoholate, hydroxy benzene sulfonic acid, neopelex is put into together in Scattered Kettle and is mixed, i.e. can get soil-solidified-agent, the soil-solidified-agent that the present invention prepares has stronger adsorption capacity to the heavy metal in soil, and reparation and solidification is played to soil, there are wide market prospects.
Description
Technical field
The invention discloses a kind of preparation method for restoration of soil polluted by heavy metal curing agent, belong to soil-solidified-agent
Preparing technical field.
Background technology
Soil-solidified-agent is a kind of by multiple inorganic, novel energy-conserving rings for solidifying all kinds of soil of organic material synthesis
Protect engineering material.It is changed the engineering properties of soil with soil by series of physical chemical reaction after mixing, can be by soil
In substantial amounts of Free water be fixed up with the form of the crystallization water so that soil micelle surface current reduces, and it is double that micelle is adsorbed
Electric layer is thinning, and electrolyte concentration strengthens, and particle tends to cohesion, volumetric expansion and further filling soil hole, in Compaction Effort
Under effect, make solidified earth be easy to compacting and stablize, thus form overall structure, and reach the inaccessiable percent consolidation of conventional institute.
Through the soil that soil-solidified-agent was processed, the performance such as its intensity, packing, the modulus of resilience, deflection value, CBR, shear strength is all
Being greatly improved, thus extending the service life of road, save maintenance of works cost, economic and environmental benefit is all
Good.
Heavy metal pollution of soil refers to that, due to mankind's activity, content in soil for the minor metallic element in soil exceedes
Background value, excess deposition and the too high levels that causes, it is referred to as heavy metal pollution of soil.Heavy metal-polluted soil refers to owing to the mankind live
Moving joins in soil by metal, causes heavy metal in soil apparently higher than primary content and to cause eco-environmental quality to deteriorate
Phenomenon.At present, the method processing heavy-metal contaminated soil mainly includes excavation, stabilisation/solidification, chemical leaching, air lift, heat
Process, biological prosthetic etc..
But, owing to existing soil-solidified-agent product class is less, and function singleness, only there is the work(of curing soil
Effect, the range of application causing soil-solidified-agent is narrow, limits promoting the use of of its.
Content of the invention
The technical problem that present invention mainly solves: less for existing soil-solidified-agent product class, and function singleness,
Only there is effect of curing soil, cause the problem that the range of application of soil-solidified-agent is narrower, provide one to be used for repairing a huge sum of money
Belong to contaminated soil curing agent preparation method, the method by size-reduced for sepiolite, sieve process after with mixed in hydrochloric acid soak, then
With deionized water rinsing filter residue until cleaning solution is neutral, filter residue is put into oven drying and prepares acid modified meerschaum, subsequently will
Banana skin is soaked by sodium hydroxide solution after making graininess, and the filter residue that will obtain after soaking uses oven drying, then after rinsing
Use Muffle furnace roasting, prepare banana skin activated carbon, then by acid modified meerschaum, banana skin activated carbon, red soil, hydroxyapatite,
Alundum (Al2O3) powder and cow dung, make mixture after being uniformly mixed, finally by mixture, perlite powder, sodium carbonate,
Zeolite, sodium alginate, methyl silicon sodium alcoholate, hydroxy benzene sulfonic acid, neopelex, put in Scattered Kettle and mix,
To soil-solidified-agent, restoration of soil polluted by heavy metal curing agent that the present invention prepares, the heavy metal in soil is had and adsorbs more by force
Ability, and reparation and solidification is played to soil, there are wide market prospects.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is:
(1) weigh 120～150g sepiolite, pulverize, sieve after 20～30 mesh particles, by sepiolite particle press solid-to-liquid ratio 1:5
With mass fraction 25% mixed in hydrochloric acid, at room temperature soak and filter to obtain filter residue after 5～7h, and with deionized water rinsing filter residue until
Cleaning solution is neutrality, puts into filter residue after flushing in baking oven, is dried 6～8h 80～95 DEG C of temperature and obtains sour modified meerschaum, standby
With；
(2) weigh the fresh banana skin of 150～200g, put in vacuum drying chamber, at 70～80 DEG C of bars after surface clean is clean
10～12h under part, by banana skin pulverizing after drying, sieve to obtain 30～40 mesh particles, soaks banana skin particle by solid-to-liquid ratio 1:5
In mass fraction 3% sodium hydroxide solution, soak suction filtration after 50～60min and obtain filter residue, by filter residue deionized water rinsing to washing
It is neutral for washing liquid, puts in baking oven, at 95～105 DEG C of drying 6～8h, dried banana skin particle is put into Muffle after flushing
In stove, at 480～520 DEG C of roasting 60～90min, after roasting, be cooled to room temperature, and pulverize, sieve to obtain 50～60 mesh powder, i.e.
Available banana skin activated carbon；
(3) count by weight, choose 50～55 parts of standby sour modified meerschaums of step (1), 20～25 parts of above-mentioned perfume (or spice) respectively
Any of several broadleaf plants leather activated char, 5～15 parts of red soil, 15～20 parts of hydroxyapatites, 1～3 part of alundum (Al2O3) powder and 5～7 parts of cow dungs, stir
Mix and after mixing, obtain mixture；
(4) count by weight, choose respectively 60～65 parts of said mixtures, 12～20 part of 60～80 mesh perlite powder, 5～
10 parts of sodium carbonate, 2～4 parts of zeolites, 8～10 parts of sodium alginates, 3～5 parts of methyl silicon sodium alcoholates, 2～4 parts of hydroxy benzene sulfonic acids, 0.1～
0.3 part of neopelex, puts in Scattered Kettle, mixes 1～2h at 100～150r/min rotating speed, i.e. can get soil
Curing agent.
The application process of the present invention is: utilizes excavator to excavate the heavy-metal contaminated soil needing reparation, and picks
Remove wherein foreign material, then add the soil-solidified-agent that the present invention prepares in the heavy-metal contaminated soil excavated to, and fully
Mixing, soil-solidified-agent addition is the 8～15% of soil quality, then the Soil Utilization road roller after mixing grinds
Flat, then maintenance 20～25 days, on soil, transplant appropriate plant subsequently, after testing, Hg in the soil of original weight metallic pollution
Content be the content that the content of 60.5mg/kg, Cd is 1.20mg/kg, Cr be 86.3mg/kg, heavy metal in soil after plantation
The concentration of Hg, Cd, Cr declines 50.2～55.8% respectively, 56.5～60.2% and 42.5～50.5%, through 6～12 months, and plant
Grow fine, wilt or the phenomena of mortality without plant.
The invention has the beneficial effects as follows:
(1) in the soil-solidified-agent of the present invention, the heavy metal component in polluted soil is had and inhales more by force by high adsorption clay component
Attached effect, contaminated soil also can be played solidification by curing agent simultaneously；
(2) soil-solidified-agent of the present invention can increase the organic matter in cure system, makes soil be conducive to exhaling of root system of plant
Inhale, promote plant growth and reduce soil erosion.
Detailed description of the invention
First weigh 120～150g sepiolite, pulverize, sieve after 20～30 mesh particles, sepiolite particle is pressed solid-liquid
Ratio 1:5 and mass fraction 25% mixed in hydrochloric acid, filter to obtain filter residue after at room temperature soaking 5～7h, and use deionized water rinsing filter residue
Until cleaning solution is neutrality, put into filter residue after flushing in baking oven, be dried 6～8h 80～95 DEG C of temperature and obtain sour modified Hai Pao
Stone, standby；Weigh the fresh banana skin of 150～200g subsequently, put in vacuum drying chamber, 70～80 after surface clean is clean
10～12h under the conditions of DEG C, by banana skin pulverizing after drying, sieve to obtain 30～40 mesh particles, and banana skin particle is pressed solid-to-liquid ratio 1:5
Being immersed in mass fraction 3% sodium hydroxide solution, after soaking 50～60min, suction filtration obtains filter residue, by filter residue deionized water rinsing
It is neutrality to cleaning solution, put into after flushing in baking oven, at 95～105 DEG C of drying 6～8h, dried banana skin particle is put into
In Muffle furnace, at 480～520 DEG C of roasting 60～90min, after roasting, be cooled to room temperature, and pulverize, sieve to obtain 50～60 mesh powder
End, i.e. can get banana skin activated carbon；Count by weight again, choose respectively 50～55 parts of standby sour modified meerschaums, 20
～25 parts of banana skin activated carbons, 5～15 parts of red soil, 15～20 parts of hydroxyapatites, 1～3 part of alundum (Al2O3) powder and 5～7
Part cow dung, obtains mixture after being uniformly mixed；
Finally count by weight, choose respectively 60～65 parts of said mixtures, 12～20 part of 60～80 mesh perlite powder, 5
～10 parts of sodium carbonate, 2～4 parts of zeolites, 8～10 parts of sodium alginates, 3～5 parts of methyl silicon sodium alcoholates, 2～4 parts of hydroxy benzene sulfonic acids, 0.1
～0.3 part of neopelex, puts in Scattered Kettle, mixes 1～2h at 100～150r/min rotating speed, i.e. can get soil
Soil curing agent.
Example 1
First weigh 120g sepiolite, pulverize, sieve after 20 mesh particles, sepiolite particle is divided with quality by solid-to-liquid ratio 1:5
Several 25% mixed in hydrochloric acid, at room temperature soak and filter to obtain filter residue after 5h, and with deionized water rinsing filter residue until during cleaning solution is
Property, put into filter residue after flushing in baking oven, being dried 6h 80 DEG C of temperature obtains sour modified meerschaum, standby；Weigh 150g subsequently new
Fresh banana skin, puts in vacuum drying chamber after surface clean is clean, 10h under the conditions of 70 DEG C, banana skin pulverizing after being dried,
Sieve to obtain 30 mesh particles, is immersed in mass fraction 3% sodium hydroxide solution banana skin particle by solid-to-liquid ratio 1:5, soaks
After 50min, suction filtration obtains filter residue, is neutral by filter residue deionized water rinsing to cleaning solution, puts in baking oven, at 95 DEG C after flushing
It is dried 6h, put into dried banana skin particle in Muffle furnace, at 480 DEG C of roasting 60min, after roasting, be cooled to room temperature, and
Pulverize, sieve to obtain 50 mesh powder, i.e. can get banana skin activated carbon；Count by weight again, choose 50 parts of standby acid respectively
Modified meerschaum, 20 parts of banana skin activated carbons, 5 parts of red soil, 15 parts of hydroxyapatites, 1 part of alundum (Al2O3) powder and 5 portions of oxen
Excrement, obtains mixture after being uniformly mixed；Finally count by weight, choose 60 parts of said mixtures, 12 part of 60 mesh treasure respectively
Pearl rock dust end, 5 parts of sodium carbonate, 2 parts of zeolites, 8 parts of sodium alginates, 3 parts of methyl silicon sodium alcoholates, 2 parts of hydroxy benzene sulfonic acids, 0.1 part 12
Sodium alkyl benzene sulfonate, puts in Scattered Kettle, at 100r/min rotating speed mixing 1h, i.e. can get soil-solidified-agent.
This example operation is easy, during use, utilizes excavator to excavate heavy-metal contaminated soil to be repaired, and picks
Remove wherein foreign material, then add the soil-solidified-agent that the present invention prepares in the heavy-metal contaminated soil excavated to, and fully
Mixing, soil-solidified-agent addition is the 8% of soil quality, then the Soil Utilization road roller flattening-out after mixing, and
Rear maintenance 20 days, transplants appropriate plant subsequently on soil, and after testing, the content of the Hg in the soil of original weight metallic pollution is
The content of 60.5mg/kg, Cd be the content of 1.20mg/kg, Cr be 86.3mg/kg, heavy metal in soil Hg, Cd, Cr after plantation
Concentration decline 50.2%, 56.5% and 42.5% respectively, through 6 months, plant grew fine, without plant wilt or the phenomena of mortality.
Example 2
First weigh 135g sepiolite, pulverize, sieve after 25 mesh particles, sepiolite particle is divided with quality by solid-to-liquid ratio 1:5
Several 25% mixed in hydrochloric acid, at room temperature soak and filter to obtain filter residue after 6h, and with deionized water rinsing filter residue until during cleaning solution is
Property, put into filter residue after flushing in baking oven, being dried 7h 88 DEG C of temperature obtains sour modified meerschaum, standby；Weigh 175g subsequently new
Fresh banana skin, puts in vacuum drying chamber after surface clean is clean, 11h under the conditions of 75 DEG C, banana skin pulverizing after being dried,
Sieve to obtain 35 mesh particles, is immersed in mass fraction 3% sodium hydroxide solution banana skin particle by solid-to-liquid ratio 1:5, soaks
After 55min, suction filtration obtains filter residue, is neutral by filter residue deionized water rinsing to cleaning solution, puts in baking oven, at 100 DEG C after flushing
It is dried 7h, put into dried banana skin particle in Muffle furnace, at 500 DEG C of roasting 75min, after roasting, be cooled to room temperature, and
Pulverize, sieve to obtain 55 mesh powder, i.e. can get banana skin activated carbon；Count by weight again, choose 53 parts of standby acid respectively
Modified meerschaum, 23 parts of banana skin activated carbons, 10 parts of red soil, 18 parts of hydroxyapatites, 2 parts of alundum (Al2O3) powder and 6 portions of oxen
Excrement, obtains mixture after being uniformly mixed；Finally count by weight, choose 63 parts of said mixtures, 16 part of 70 mesh treasure respectively
Pearl rock dust end, 8 parts of sodium carbonate, 3 parts of zeolites, 9 parts of sodium alginates, 4 parts of methyl silicon sodium alcoholates, 3 parts of hydroxy benzene sulfonic acids, 0.2 part 12
Sodium alkyl benzene sulfonate, puts in Scattered Kettle, at 125r/min rotating speed mixing 1.5h, i.e. can get soil-solidified-agent.
This example operation is easy, during use, utilizes excavator to excavate heavy-metal contaminated soil to be repaired, and picks
Remove wherein foreign material, then add the soil-solidified-agent that the present invention prepares in the heavy-metal contaminated soil excavated to, and fully
Mixing, soil-solidified-agent addition is the 12% of soil quality, then the Soil Utilization road roller flattening-out after mixing,
Then maintenance 23 days, transplants appropriate plant subsequently on soil, and after testing, the content of the Hg in the soil of original weight metallic pollution is
The content of 60.5mg/kg, Cd be the content of 1.20mg/kg, Cr be 86.3mg/kg, heavy metal in soil Hg, Cd, Cr after plantation
Concentration decline 53.5%, 58.5% and 45.6% respectively, through 8 months, plant grew fine, without plant wilt or the phenomena of mortality.
Example 3
First weigh 150g sepiolite, pulverize, sieve after 30 mesh particles, sepiolite particle is divided with quality by solid-to-liquid ratio 1:5
Several 25% mixed in hydrochloric acid, at room temperature soak and filter to obtain filter residue after 7h, and with deionized water rinsing filter residue until during cleaning solution is
Property, put into filter residue after flushing in baking oven, being dried 8h 95 DEG C of temperature obtains sour modified meerschaum, standby；Weigh 200g subsequently new
Fresh banana skin, puts in vacuum drying chamber after surface clean is clean, 12h under the conditions of 80 DEG C, banana skin pulverizing after being dried,
Sieve to obtain 40 mesh particles, is immersed in mass fraction 3% sodium hydroxide solution banana skin particle by solid-to-liquid ratio 1:5, soaks
After 60min, suction filtration obtains filter residue, is neutral by filter residue deionized water rinsing to cleaning solution, puts in baking oven, at 105 DEG C after flushing
It is dried 8h, put into dried banana skin particle in Muffle furnace, at 520 DEG C of roasting 90min, after roasting, be cooled to room temperature, and
Pulverize, sieve to obtain 60 mesh powder, i.e. can get banana skin activated carbon；Count by weight again, choose 55 parts of standby acid respectively
Modified meerschaum, 25 parts of banana skin activated carbons, 15 parts of red soil, 20 parts of hydroxyapatites, 3 parts of alundum (Al2O3) powder and 7 portions of oxen
Excrement, obtains mixture after being uniformly mixed；Finally count by weight, choose 65 parts of said mixtures, 20 part of 80 mesh treasure respectively
Pearl rock dust end, 10 parts of sodium carbonate, 4 parts of zeolites, 10 parts of sodium alginates, 5 parts of methyl silicon sodium alcoholates, 4 parts of hydroxy benzene sulfonic acids, 0.3 part ten
Dialkyl benzene sulfonic acids sodium, puts in Scattered Kettle, at 150r/min rotating speed mixing 2h, i.e. can get soil-solidified-agent.
This example operation is easy, during use, utilizes excavator to excavate heavy-metal contaminated soil to be repaired, and picks
Remove wherein foreign material, then add the soil-solidified-agent that the present invention prepares in the heavy-metal contaminated soil excavated to, and fully
Mixing, soil-solidified-agent addition is the 15% of soil quality, then the Soil Utilization road roller flattening-out after mixing,
Then maintenance 25 days, transplants appropriate plant subsequently on soil, and after testing, the content of the Hg in the soil of original weight metallic pollution is
The content of 60.5mg/kg, Cd be the content of 1.20mg/kg, Cr be 86.3mg/kg, heavy metal in soil Hg, Cd, Cr after plantation
Concentration decline 55.8%, 60.2% and 50.5% respectively, through 12 months, plant grew fine, and wilted or dead existing without plant
As.
Claims (1)
1. the preparation method for restoration of soil polluted by heavy metal curing agent, it is characterised in that concrete preparation process is:
(1) weigh 120～150g sepiolite, pulverize, sieve after 20～30 mesh particles, by sepiolite particle press solid-to-liquid ratio 1:5
With mass fraction 25% mixed in hydrochloric acid, at room temperature soak and filter to obtain filter residue after 5～7h, and with deionized water rinsing filter residue until
Cleaning solution is neutrality, puts into filter residue after flushing in baking oven, is dried 6～8h 80～95 DEG C of temperature and obtains sour modified meerschaum, standby
With；
(2) weigh the fresh banana skin of 150～200g, put in vacuum drying chamber, at 70～80 DEG C of bars after surface clean is clean
10～12h under part, by banana skin pulverizing after drying, sieve to obtain 30～40 mesh particles, soaks banana skin particle by solid-to-liquid ratio 1:5
In mass fraction 3% sodium hydroxide solution, soak suction filtration after 50～60min and obtain filter residue, by filter residue deionized water rinsing to washing
It is neutral for washing liquid, puts in baking oven, at 95～105 DEG C of drying 6～8h, dried banana skin particle is put into Muffle after flushing
In stove, at 480～520 DEG C of roasting 60～90min, after roasting, be cooled to room temperature, and pulverize, sieve to obtain 50～60 mesh powder, i.e.
Available banana skin activated carbon；
(3) count by weight, choose 50～55 parts of standby sour modified meerschaums of step (1), 20～25 parts of above-mentioned perfume (or spice) respectively
Any of several broadleaf plants leather activated char, 5～15 parts of red soil, 15～20 parts of hydroxyapatites, 1～3 part of alundum (Al2O3) powder and 5～7 parts of cow dungs, stir
Mix and after mixing, obtain mixture；
(4) count by weight, choose respectively 60～65 parts of said mixtures, 12～20 part of 60～80 mesh perlite powder, 5～
10 parts of sodium carbonate, 2～4 parts of zeolites, 8～10 parts of sodium alginates, 3～5 parts of methyl silicon sodium alcoholates, 2～4 parts of hydroxy benzene sulfonic acids, 0.1～
0.3 part of neopelex, puts in Scattered Kettle, mixes 1～2h at 100～150r/min rotating speed, i.e. can get soil
Curing agent.
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| CN107771451A (en) * | 2017-10-17 | 2018-03-09 | 惠州市无龄康态健康科技有限公司 | A kind of method for reducing pakchoi and absorbing heavy metal nickel |
| CN109078972A (en) * | 2017-06-14 | 2018-12-25 | 中国地质科学院矿产资源研究所 | Heavy metal contaminated soil remediation material and application method thereof |
| CN111171822A (en) * | 2020-01-07 | 2020-05-19 | 扬州工业职业技术学院 | Preparation method of zeolite modified shell activated carbon and application of zeolite modified shell activated carbon in improvement of farmland soil and reduction of pollution and emission of non-point source |
| CN111909705A (en) * | 2020-07-10 | 2020-11-10 | 广西夏阳环保科技有限公司 | Acidic heavy metal composite soil remediation agent and using method thereof |
| CN112048305A (en) * | 2020-07-10 | 2020-12-08 | 广西夏阳环保科技有限公司 | Remediation agent for cadmium and chromium contaminated soil and preparation method thereof |
| CN113083850A (en) * | 2021-03-26 | 2021-07-09 | 维塔探索(广东)科技有限公司 | Composite biochar for preventing and treating heavy metal pollution and preparation method thereof |
| CN114950387A (en) * | 2022-05-31 | 2022-08-30 | 周海滨 | Anti-pollution soil remediation agent and preparation method thereof |
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