CN107699244A - A kind of modifying agent for soil remediation and preparation method thereof - Google Patents
A kind of modifying agent for soil remediation and preparation method thereof Download PDFInfo
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- CN107699244A CN107699244A CN201710927688.1A CN201710927688A CN107699244A CN 107699244 A CN107699244 A CN 107699244A CN 201710927688 A CN201710927688 A CN 201710927688A CN 107699244 A CN107699244 A CN 107699244A
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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
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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
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- C09K2101/00—Agricultural use
Abstract
The invention discloses a kind of modifying agent for soil remediation, it is made up of following raw material according to parts by weight：8 14 parts of 35 48 parts of stalk, 15 25 parts of sewage plant sludge, 12 16 parts of bentonite, 5 10 parts of vermiculite, 6 12 parts of medical stone, 10 15 parts of attapulgite, 8 12 parts of sepiolite, 5 10 parts of micarex, 25 parts of starch, 1.5 2.8 parts of sulfate, 36 parts of willow, 48 parts of chocho, 23 parts of Monstera deliciosa and tea leaf residual.The present invention also disclosed the preparation method of the modifying agent.The raw material of the present invention is pure natural raw material and raw material rich reserves are easy to get, and the finished product of preparation can improve soil texture, eliminate heavy metal pollution of soil, this product ecological pollution is small, returns a healthy life environment for people, and has the value of environmental protection and ecological benefits.
Description
Technical field
The present invention relates to remediation contaminated soil field, specifically a kind of modifying agent for soil remediation.
Background technology
The modern society of high speed development, while material life with rapid changepl. never-ending changes and improvements is brought, also bring
Many harm, many of which harm is all caused by people excessively intervene to nature.Soil is the base of plant life
Plinth, it has been for the survival of mankind basic, since people are engaged in agricultural production, people ceaselessly carry out rope to soil always
Take, especially since modern agricultural development, chemical fertilizer and agricultural chemicals is excessively used in people, destroyed soil texture, lost activity,
Caking, mineralising and cracking, land farming continuation are destroyed, and cause soil toxic heavy metal excessive buildup, wherein, with lead,
Cadmium pollution degree highest, these heavy metals are easily entered in human body by food chain, and serious health risk, people are brought to human body
Soil must be administered.
It is largely chemical industry aspect to be administered the raw material mostly used to soil at present, and fraction is biomaterial,
Although having used a small amount of mineral material, amount is few, does not reach the purpose of regulation soil texture, and chemical materials, biomaterial valency
Lattice are expensive, and resource provision is deficient, and this just brings inconvenience for soil remediation.
The content of the invention
It is an object of the invention to provide a kind of modifying agent for soil remediation, to solve to propose in above-mentioned background technology
The problem of.
To achieve the above object, the present invention provides following technical scheme：
A kind of modifying agent for soil remediation, it is made up of following raw material according to parts by weight：Stalk 35-48 parts, sewage plant
Sludge 15-25 parts, bentonite 12-16 parts, vermiculite 5-10 parts, medical stone 6-12 parts, attapulgite 10-15 parts, sepiolite 8-12
Part, micarex 5-10 parts, starch 2-5 parts, sulfate 1.5-2.8 parts, willow 3-6 parts, chocho 4-8 parts, Monstera deliciosa 2-3 parts and
Tea leaf residual 8-14 parts.
As the further scheme of the present invention：Starch uses food starch, and sulfate is using zinc sulfate, calcium sulfate, sulfuric acid
At least one of ammonium and sodium sulphate.
As the further scheme of the present invention：The modifying agent also includes humic acid 6-10 parts and fruit/vegetable waste 15-22 parts.
The preparation method of the modifying agent for soil remediation, is comprised the following steps that：
Step 1, by sewage plant sludge it is air-dried, it is broken and cross 80-120 mesh sieve, sewage sludge powder is obtained, by powder of straw
Broken and mistake 60-80 mesh sieve, obtains stalk powder, stalk powder is immersed to 0.6-0.8mol/L hydrochloric acid solution successively, gone
15-22 minutes in ionized water and 0.4-0.6mol/L sodium hydroxide solution, finally it is washed with deionized water to neutrality, Ran Hou
Constant weight is dried under 35-50 degrees Celsius, you can obtains modified straw powder；
Step 2, modified straw powder, sewage sludge powder and tea leaf residual are well mixed, preheated under 80-90 degrees Celsius
3-6 hours, then in 520-585 degrees Celsius of lower anaerobic decomposition 3-4 hour, then catabolite is put into watery hydrochloric acid and rinsed
90-150 minutes, then it is washed with deionized water to neutrality, carries out separation of solid and liquid and can obtain thick charcoal, thick charcoal is crushed to 240-
300 mesh, obtain active carbon powder；
Step 3,80-100 mesh sieves are crossed after willow natural drying is air-dried, willow powder is obtained, willow powder is placed in band
In the round-bottomed flask of reflux condensing tube, extract solution is then added, then round bottom flask is entered in microwave reactor, in microwave power
For 80-85W, temperature carries out Microwave Extraction 1-2 minutes under conditions of being 40-48 degrees Celsius, obtains willow extract solution, willow is carried
Take liquid to be filtered after being cooled to normal temperature, after being concentrated in vacuo under 40 degrees Celsius of filtrate, be dried under vacuum to matter at 60 c
Measure constant, obtain willow extract；
Step 4, the 80-100% ethanol waters backflow that Monstera deliciosa is broken and adds 5-50 times of Monstera deliciosa weight to measure is carried
Take 3-6 times, each 4-8 hours, ethanol water extraction solution for standby is merged after filtration, ethanol aqueous extract is reclaimed into ethanol, and it is dense
The concentrate that relative density is 1.00-1.20 is reduced to, is stood, is filtered, filtrate is standby；By the ethanol water after concentration or directly
By ethanol water resin adsorption, adsorbate is washed with water, then is eluted with 70-100% alcohol, collection alcohol eluen, recovery alcohol,
Dry, crush and sieve, obtain curvature of the spinal column bamboo extract；
Step 5, chocho is crushed and digested, enzymolysis product is extracted and purified, then extract is entered
Row is concentrated and dried, you can obtains chocho zymolyte；
Step 6, bentonite, vermiculite, medical stone, attapulgite, sepiolite and micarex are put into grinder and ground
Mill, stop grinding after being ground into 200-280 mesh, the material powder after grinding is put into mixer, added in mixer
Active carbon powder, willow extract, curvature of the spinal column bamboo extract, chocho zymolyte and sulfate carry out being sufficiently mixed stirring, obtain
Semi-finished product；
Step 7, semi-finished product are fully mixed with starch and are granulated, you can obtain finished product.
As the further scheme of the present invention：Mixing process in step 6 uses dry mixing.
Compared with prior art, the beneficial effects of the invention are as follows：Raw material sources of the present invention are extensive, and preparation technology is simple, this
The raw material of invention is pure natural raw material and raw material rich reserves are easy to get, and the finished product of preparation can improve soil texture, is eliminated
Heavy metal pollution of soil, this product ecological pollution is small, returns a healthy life environment for people, and has the value of environmental protection and ecological benefits.
Embodiment
The technical scheme of this patent is described in more detail with reference to embodiment.
Embodiment 1
A kind of modifying agent for soil remediation, it is made up of following raw material according to parts by weight：35 parts of stalk, sewage plant sludge
15 parts, 12 parts of bentonite, 5 parts of vermiculite, 6 parts of medical stone, 10 parts of attapulgite, 8 parts of sepiolite, 5 parts of micarex, 2 parts of starch, sulphur
8 parts of 1.5 parts of hydrochlorate, 3 parts of willow, 4 parts of chocho, 2 parts of Monstera deliciosa and tea leaf residual.Starch uses food starch, and sulfate is adopted
Use zinc sulfate.
The preparation method of the modifying agent for soil remediation, is comprised the following steps that：
Step 1, by sewage plant sludge it is air-dried, it is broken and cross 90 mesh sieve, obtain sewage sludge powder, by stalk crush simultaneously
And cross 60 mesh sieve, obtain stalk powder, stalk powder is immersed successively 0.6mol/L hydrochloric acid solution, deionized water and
18 minutes in 0.4mol/L sodium hydroxide solution, finally it is washed with deionized water to neutrality, is then dried under 38 degrees Celsius
Constant weight, you can obtain modified straw powder；
Step 2, modified straw powder, sewage sludge powder and tea leaf residual are well mixed, it is small that 4 are preheated under 84 degrees Celsius
When, then in 545 degrees Celsius of lower anaerobic decompositions 3 hours, then catabolite is put into watery hydrochloric acid and rinsed 90 minutes, Ran Houyong
Deionized water is washed till neutrality, carries out separation of solid and liquid and can obtain thick charcoal, thick charcoal is crushed into 240 mesh, obtains active carbon powder；
Step 3,80 mesh sieves are crossed after willow natural drying is air-dried, obtain willow powder, willow powder is placed in band backflow
In the round-bottomed flask of condenser pipe, extract solution is then added, then round bottom flask is entered in microwave reactor, is in microwave power
80W, temperature carry out Microwave Extraction 1 minute under conditions of being 40 degrees Celsius, obtain willow extract solution, willow extract solution is cooled to
Filtered after normal temperature, after being concentrated in vacuo under 40 degrees Celsius of filtrate, be dried under vacuum to constant mass at 60 c, obtain
Willow extract；
Step 4, Monstera deliciosa is crushed and adds 20 times of Monstera deliciosa weight, the 80% ethanol water refluxing extraction measured 4 times,
6 hours every time, ethanol water extraction solution for standby is merged after filtration, ethanol aqueous extract is reclaimed into ethanol, and be concentrated into relatively close
The concentrate for 1.10 is spent, is stood, is filtered, filtrate is standby；By the ethanol water after concentration or directly ethanol water is used
Resin adsorption, adsorbate are washed with water, then are eluted with 90% alcohol, collect alcohol eluen, reclaim alcohol, drying, crushing and sieve,
Obtain curvature of the spinal column bamboo extract；
Step 5, chocho is crushed and digested, enzymolysis product is extracted and purified, then extract is entered
Row is concentrated and dried, you can obtains chocho zymolyte；
Step 6, bentonite, vermiculite, medical stone, attapulgite, sepiolite and micarex are put into grinder and ground
Mill, stop grinding after being ground into 240 mesh, the material powder after grinding is put into mixer, activity is added in mixer
Carbon powder, willow extract, curvature of the spinal column bamboo extract, chocho zymolyte and sulfate carry out being sufficiently mixed stirring, obtain half into
Product；
Step 7, semi-finished product are fully mixed with starch and are granulated, you can obtain finished product.
Embodiment 2
A kind of modifying agent for soil remediation, it is made up of following raw material according to parts by weight：42 parts of stalk, sewage plant sludge
19 parts, 15 parts of bentonite, 8 parts of vermiculite, 9 parts of medical stone, 12 parts of attapulgite, 10 parts of sepiolite, 7 parts of micarex, starch 3.5
Part, 2.2 parts of sulfate, 5 parts of willow, 6 parts of chocho, 2.5 parts of Monstera deliciosa, 12 parts of tea leaf residual, 8 parts of humic acid and fruits and vegetables are discarded
18 parts of thing.
The preparation method of the modifying agent for soil remediation, is comprised the following steps that：
Step 1, by sewage plant sludge it is air-dried, it is broken and cross 100 mesh sieve, obtain sewage sludge powder, by stalk crush simultaneously
And cross 80 mesh sieve, obtain stalk powder, stalk powder is immersed successively 0.8mol/L hydrochloric acid solution, deionized water and
20 minutes in 0.4mol/L sodium hydroxide solution, finally it is washed with deionized water to neutrality, is then dried under 42 degrees Celsius
Constant weight, you can obtain modified straw powder；
Step 2, modified straw powder, sewage sludge powder, fruit/vegetable waste and tea leaf residual are well mixed, it is Celsius 86
The lower preheating of degree 5 hours, then in 560 degrees Celsius of lower anaerobic decompositions 3.5 hours, then catabolite is put into watery hydrochloric acid and rinsed
130 minutes, then it is washed with deionized water to neutrality, carries out separation of solid and liquid and can obtain thick charcoal, thick charcoal is crushed to 270 mesh, obtained
To active carbon powder；
Step 3,100 mesh sieves are crossed after willow natural drying is air-dried, willow powder is obtained, willow powder is placed in and taken back
In the round-bottomed flask for flowing condenser pipe, extract solution is then added, then round bottom flask is entered in microwave reactor, is in microwave power
84W, temperature carry out Microwave Extraction 2 minutes under conditions of being 46 degrees Celsius, obtain willow extract solution, willow extract solution is cooled to
Filtered after normal temperature, after being concentrated in vacuo under 40 degrees Celsius of filtrate, be dried under vacuum to constant mass at 60 c, obtain
Willow extract；
Step 4, Monstera deliciosa is crushed and adds 35 times of Monstera deliciosa weight, the 86% ethanol water refluxing extraction measured 5 times,
5 hours every time, ethanol water extraction solution for standby is merged after filtration, ethanol aqueous extract is reclaimed into ethanol, and be concentrated into relatively close
The concentrate for 1.06 is spent, is stood, is filtered, filtrate is standby；By the ethanol water after concentration or directly ethanol water is used
Resin adsorption, adsorbate are washed with water, then are eluted with 88% alcohol, collect alcohol eluen, reclaim alcohol, drying, crushing and sieve,
Obtain curvature of the spinal column bamboo extract；
Step 5, chocho is crushed and digested, enzymolysis product is extracted and purified, then extract is entered
Row is concentrated and dried, you can obtains chocho zymolyte；
Step 6, bentonite, vermiculite, medical stone, attapulgite, sepiolite and micarex are put into grinder and ground
Mill, stop grinding after being ground into 260 mesh, the material powder after grinding is put into mixer, activity is added in mixer
Carbon powder, willow extract, curvature of the spinal column bamboo extract, humic acid, chocho zymolyte and sulfate carry out being sufficiently mixed dry mixing, obtain
To semi-finished product；
Step 7, semi-finished product are fully mixed with starch and are granulated, you can obtain finished product.
Embodiment 3
A kind of modifying agent for soil remediation, it is made up of following raw material according to parts by weight：48 parts of stalk, sewage plant sludge
25 parts, 16 parts of bentonite, 10 parts of vermiculite, 12 parts of medical stone, 15 parts of attapulgite, 12 parts of sepiolite, 10 parts of micarex, starch 5
Part, 2.8 parts of sulfate, 6 parts of willow, 8 parts of chocho, 3 parts of Monstera deliciosa, 14 parts of tea leaf residual, 10 parts of humic acid and fruits and vegetables are discarded
22 parts of thing.Starch uses food starch, and sulfate uses the mixture of zinc sulfate, calcium sulfate, ammonium sulfate and sodium sulphate.
The preparation method of the modifying agent for soil remediation, is comprised the following steps that：
Step 1, by sewage plant sludge it is air-dried, it is broken and cross 120 mesh sieve, obtain sewage sludge powder, by stalk crush simultaneously
And cross 80 mesh sieve, obtain stalk powder, stalk powder is immersed successively 0.6mol/L hydrochloric acid solution, deionized water and
20 minutes in 0.5mol/L sodium hydroxide solution, finally it is washed with deionized water to neutrality, is then dried under 460 degrees Celsius
Constant weight, you can obtain modified straw powder；
Step 2, modified straw powder, sewage sludge powder, fruit/vegetable waste and tea leaf residual are well mixed, it is Celsius 90
The lower preheating of degree 5 hours, then in 585 degrees Celsius of lower anaerobic decompositions 4 hours, then catabolite is put into watery hydrochloric acid and rinsed
140 minutes, then it is washed with deionized water to neutrality, carries out separation of solid and liquid and can obtain thick charcoal, thick charcoal is crushed to 300 mesh, obtained
To active carbon powder；
Step 3,100 mesh sieves are crossed after willow natural drying is air-dried, willow powder is obtained, willow powder is placed in and taken back
In the round-bottomed flask for flowing condenser pipe, extract solution is then added, then round bottom flask is entered in microwave reactor, is in microwave power
85W, temperature carry out Microwave Extraction 1 minute under conditions of being 48 degrees Celsius, obtain willow extract solution, willow extract solution is cooled to
Filtered after normal temperature, after being concentrated in vacuo under 40 degrees Celsius of filtrate, be dried under vacuum to constant mass at 60 c, obtain
Willow extract；
Step 4, Monstera deliciosa is crushed and adds 40 times of Monstera deliciosa weight, the 90% ethanol water refluxing extraction measured 3 times,
6 hours every time, ethanol water extraction solution for standby is merged after filtration, ethanol aqueous extract is reclaimed into ethanol, and be concentrated into relatively close
The concentrate for 1.15 is spent, is stood, is filtered, filtrate is standby；By the ethanol water after concentration or directly ethanol water is used
Resin adsorption, adsorbate are washed with water, then are eluted with 90% alcohol, collect alcohol eluen, reclaim alcohol, drying, crushing and sieve,
Obtain curvature of the spinal column bamboo extract；
Step 5, chocho is crushed and digested, enzymolysis product is extracted and purified, then extract is entered
Row is concentrated and dried, you can obtains chocho zymolyte；
Step 6, bentonite, vermiculite, medical stone, attapulgite, sepiolite and micarex are put into grinder and ground
Mill, stop grinding after being ground into 280 mesh, the material powder after grinding is put into mixer, activity is added in mixer
Carbon powder, willow extract, curvature of the spinal column bamboo extract, humic acid, chocho zymolyte and sulfate carry out being sufficiently mixed dry mixing, obtain
To semi-finished product；
Step 7, semi-finished product are fully mixed with starch and are granulated, you can obtain finished product.
The present invention is prepared for biological activated carbon using raw materials such as stalks, and surface has abundant active group, pore structure
Prosperity, specific surface area is larger, adsorption capacity is big and chemical stability is good, is advantageous to adsorb heavy metal, sulfate can be with a huge sum of money
Category forms complexing product, and heavy metal precipitation thing can be promoted to generate, be advantageous to the steady in a long-term of sediment, and starch is except with making
Grain effect, it can also be grain and energy that soil increases microorganisms, be easy to microorganism to improve soil, willow carries
The combination of thing, curvature of the spinal column bamboo extract and the component such as chocho zymolyte and activated carbon, attapulgite is taken, can not only strengthen hole
The absorption of middle heavy metal, moreover it is possible to reconcile the gas permeability of soil, increase soil activation, favourable soil structure improved addictive, make mineralising
The soil restoration mellowness of caking, promote plant benign growths.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (5)
1. a kind of modifying agent for soil remediation, it is characterised in that be made up of following raw material according to parts by weight：Stalk 35-48
Part, sewage plant sludge 15-25 parts, bentonite 12-16 parts, vermiculite 5-10 parts, medical stone 6-12 parts, attapulgite 10-15 parts, sea
Afrodite 8-12 parts, micarex 5-10 parts, starch 2-5 parts, sulfate 1.5-2.8 parts, willow 3-6 parts, chocho 4-8 parts, the curvature of the spinal column
Bamboo 2-3 parts and tea leaf residual 8-14 parts.
2. the modifying agent according to claim 1 for soil remediation, it is characterised in that the starch is formed sediment using edible
Powder, sulfate is using at least one of zinc sulfate, calcium sulfate, ammonium sulfate and sodium sulphate.
3. the modifying agent according to claim 1 or 2 for soil remediation, it is characterised in that the modifying agent also includes corruption
Grow sour 6-10 parts and fruit/vegetable waste 15-22 parts.
A kind of 4. preparation method of modifying agent for soil remediation as described in claim 1-3 is any, it is characterised in that tool
Body step is as follows：
Step 1, by sewage plant sludge it is air-dried, it is broken and cross 80-120 mesh sieve, obtain sewage sludge powder, by stalk crush simultaneously
And 60-80 mesh sieve is crossed, stalk powder is obtained, stalk powder is immersed to 0.6-0.8mol/L hydrochloric acid solution, deionization successively
15-22 minutes, are finally washed with deionized water to neutrality, then in 35-50 in water and 0.4-0.6mol/L sodium hydroxide solution
Constant weight is dried under degree Celsius, you can obtain modified straw powder；
Step 2, modified straw powder, sewage sludge powder and tea leaf residual are well mixed, it is small that 3-6 is preheated under 80-90 degrees Celsius
When, then in 520-585 degrees Celsius of lower anaerobic decomposition 3-4 hour, then catabolite is put into watery hydrochloric acid and rinses 90-150
Minute, then it is washed with deionized water to neutrality, carries out separation of solid and liquid and can obtain thick charcoal, thick charcoal is crushed to 240-300 mesh, obtained
To active carbon powder；
Step 3,80-100 mesh sieves are crossed after willow natural drying is air-dried, obtain willow powder, willow powder is placed in band backflow
In the round-bottomed flask of condenser pipe, extract solution is then added, then round bottom flask is entered in microwave reactor, is in microwave power
80-85W, temperature carry out Microwave Extraction 1-2 minutes under conditions of being 40-48 degrees Celsius, obtain willow extract solution, willow is extracted
Liquid is filtered after being cooled to normal temperature, after being concentrated in vacuo under 40 degrees Celsius of filtrate, is dried under vacuum to quality at 60 c
It is constant, obtain willow extract；
Step 4, by the 80-100% ethanol water refluxing extractions 3-6 that Monstera deliciosa is broken and adds 5-50 times of Monstera deliciosa weight to measure
It is secondary, each 4-8 hours, ethanol water extraction solution for standby is merged after filtration, ethanol aqueous extract is reclaimed into ethanol, and be concentrated into phase
To the concentrate that density is 1.00-1.20, stand, filtering, filtrate is standby；By the ethanol water after concentration or directly by ethanol
Aqueous solution resin adsorption, adsorbate are washed with water, then are eluted with 70-100% alcohol, collect alcohol eluen, recovery alcohol, drying, powder
It is broken and sieve, obtain curvature of the spinal column bamboo extract；
Step 5, chocho is crushed and digested, enzymolysis product is extracted and purified, then extract carried out dense
Contracting drying, you can obtain chocho zymolyte；
Step 6, bentonite, vermiculite, medical stone, attapulgite, sepiolite and micarex are put into grinder and are ground,
Stop grinding after being ground into 200-280 mesh, the material powder after grinding is put into mixer, activity is added in mixer
Carbon powder, willow extract, curvature of the spinal column bamboo extract, chocho zymolyte and sulfate carry out being sufficiently mixed stirring, obtain half into
Product；
Step 7, semi-finished product are fully mixed with starch and are granulated, you can obtain finished product.
5. the preparation method of the modifying agent according to claim 4 for soil remediation, it is characterised in that the step 6
In mixing process use dry mixing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108745281A (en) * | 2018-05-21 | 2018-11-06 | 泉州万利得节能科技有限公司 | A kind of nano-mineral activated carbon and preparation method thereof |
| CN108865168A (en) * | 2018-08-24 | 2018-11-23 | 广州市环境保护工程设计院有限公司 | A kind of heavy-metal contaminated soil renovation agent and preparation method thereof |
| CN109135760A (en) * | 2018-09-14 | 2019-01-04 | 苏州格瑞格登新材料科技有限公司 | A kind of soil-repairing agent and preparation method thereof based on agricultural crop straw |
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