CN110305666A - A kind of heavy metal lead pollution soil stabilizer and preparation method - Google Patents
A kind of heavy metal lead pollution soil stabilizer and preparation method Download PDFInfo
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- CN110305666A CN110305666A CN201910378532.1A CN201910378532A CN110305666A CN 110305666 A CN110305666 A CN 110305666A CN 201910378532 A CN201910378532 A CN 201910378532A CN 110305666 A CN110305666 A CN 110305666A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 49
- 239000003583 soil stabilizing agent Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 45
- 239000010457 zeolite Substances 0.000 claims abstract description 45
- 239000002994 raw material Substances 0.000 claims abstract description 43
- 239000002734 clay mineral Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 13
- 238000010926 purge Methods 0.000 claims abstract description 10
- 230000004048 modification Effects 0.000 claims abstract description 9
- 238000012986 modification Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 26
- 238000012545 processing Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052908 analcime Inorganic materials 0.000 claims description 3
- 229910052677 heulandite Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910052679 scolecite Inorganic materials 0.000 claims description 3
- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 claims 1
- 229910001603 clinoptilolite Inorganic materials 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 77
- 238000001179 sorption measurement Methods 0.000 abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 10
- 239000011707 mineral Substances 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 238000005067 remediation Methods 0.000 abstract description 6
- 230000001681 protective effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 19
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 12
- 238000002386 leaching Methods 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910052793 cadmium Inorganic materials 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000013475 authorization Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010027439 Metal poisoning Diseases 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011953 bioanalysis Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- HUTDDBSSHVOYJR-UHFFFAOYSA-H bis[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphaplumbetan-2-yl)oxy]lead Chemical compound [Pb+2].[Pb+2].[Pb+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O HUTDDBSSHVOYJR-UHFFFAOYSA-H 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000000748 cardiovascular system Anatomy 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 208000010501 heavy metal poisoning Diseases 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 210000000987 immune system Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052649 zeolite group Inorganic materials 0.000 description 1
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
- B09C1/08—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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
-
- 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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention discloses a kind of heavy metal lead pollution soil stabilizer and preparation method, is related to environment remediation technical field, comprising the following steps: (1) prepare raw material: dry clay mineral, zeolite, white lime are ground raw material powder respectively；(2) mixed raw material: in proportion by smashed raw material powder uniform stirring, mixed raw material is obtained；(3) material modification: mixed raw material is subjected to active purge and heat treatment, obtains modified soil stabilizer.The present invention is by using using natural zeolite, clay mineral and white lime as the main component of soil stabilizer, modification has been carried out by surface of the thermally-denatured mode of high temperature to mineral, improve the adsorption efficiency and absorption specific aim of other Mineral pairs heavy metal leads such as zeolite, it is environmentally protective, it is added in soil, does not will cause secondary pollution.
Description
Technical field
The present invention relates to environment remediation technical field, specially a kind of heavy metal lead pollution soil stabilizer and preparation side
Method.
Background technique
Soil is main matter for the survival of mankind basis, but due to the mankind to the exploitation of heavy metal, smelting, processing and
Business manufacturing activities are increasing, and heavy metal is caused to enter in soil, cause serious environmental pollution, the industrial activity of the mankind,
Such as: exploitation of mineral resources, metal smelt, sanitary wastewater discharge, the use of chemical fertilizer and pesticide greatly accelerate following for heavy metal
Ring makes the heavy metal in environment in ever-increasing trend, increases harm of the heavy metal to human health.When in entrance environment
Heavy metal when being more than its capacity in the environment, that is, can lead to the generation of heavy metal pollution.Heavy metal contaminants are persistence
Pollutant is difficult to eliminate to the harm of environment and human body.
Heavy metal contaminants mobility very little in the soil, is not microbial degradation, after entering human body by food chain, is dived
Very harmful, thus especially to pay attention to heavy metal to soil pollution.Some mines row's of not setting up stone field and tailing in exploitation
Library, barren rock and tailing are arbitrarily stacked, and the heavy metal in tailing is caused to enter soil, along with remaining metal is useless after ore processing
Slag enters ground water regime with rainwater, causes serious heavy metal pollution of soil；More importantly heavy metal is moved by food chain
It moves into the human body, accumulates gradually in human body, cause the chronic heavy metal poisoning of human body, lead to kidney, liver, lung, bone, life
Organ, immune system, cardiovascular system injury are grown, high risks are caused to human health.
Currently, the soil remediation method of heavy metal lead pollution mainly uses chemical method (e.g., elution method, application renovation agent method
Deng), physical method (e.g., soil improvement by importing soil from other places, electric treatment etc.) and bioanalysis (e.g., phytoremediation etc.).Wherein, chemical leaching method cost compared with
Low, treating capacity is big, but the problems such as can destroy soil texture and can cause loss of soil nutrient and underground water pollution；Peripheral doses
Technology only changes the form of heavy metal in the soil, heavy metal cannot be made really to be detached from from soil, with environment item
The change of part, biological effectiveness may also change, and are easy reactivation and endanger soil environment；Electro reclamation is only applicable to
The small reparation of pollution range, and it is not suitable for acid condition, due to the complexity of soil environment, often will appear and desired effect phase
Anti- situation, to limit its application.Phytoremediation is more demanding to edaphic condition, is limited by environmental factor larger, repairs
Multiple range is only limitted to root system range, and repairing efficiency is long, and the excessively high normal growth that can inhibit plant of heavy metal concentration.
Authorization Notice No. is stablized for the elution that the patent of invention of CN104070059B discloses a kind of processing lead-contaminated soil
Change restorative procedure, this method is using the technology for first washing leaching rear stabilization, at normal temperature, acts on by chemical leaching by contaminated soil
In lead be enriched with to elution filtrate in, wash leaching after soil be stabilization agent react, pass through physics under normal temperature and pressure conditions
Chemical action forms stable lead phosphate quasi-mineral, the contaminated soil of 1000mg/kg is lower than for concentration of lead contamination, through handling
The leaching concentration of lead is lower than 1mg/L in soil afterwards.
Authorization Notice No. is that the patent of invention of CN102500612B discloses a kind of chemistry for heavy-metal contaminated soil
Leaching repairing method elutes heavy-metal contaminated soil using Na2EDTA solution, effectively removes soil available Cd and lead, and
Using Na2S9H2O come the heavy metal in precipitation filtrates, Na2EDTA is made to retrieve release, to reach Na2EDTA solution
Recycled for multiple times, Na2EDTA solution after the recovery elutes heavy-metal contaminated soil.Although above-mentioned chemical leaching method can be right
Lead in contaminated soil is handled, but soil texture can be destroyed and loss of soil nutrient and underground water pollution can be caused etc.
Problem.
Authorization Notice No. is a kind of lead-cadmium combined pollution soil fortification of plants restorative procedure of CN104607453B,
It is poured according to 60%~70% that water capacity is field capacity to the lead-cadmium combined pollution soil in repairing efficiency
DOM solution, the DOM solution is the mixture of soil extraction and stalk humification solution, will be described after repairing efficiency
Rehabilitation plant is integrally removed from the lead-cadmium combined pollution soil.This method is limited larger by environmental factor, and repair coverage is only
It is limited to root system range, repairing efficiency is long.
The patent of invention of Publication No. CN106734156A discloses a kind of with Electrodynamic force method regulation cadmium and lead-contaminated soil
System, the lead contamination in soil is handled by using the mode of electrolysis, however the electro reclamation is only applicable to
The small reparation of pollution range, and it is not suitable for acid condition, due to the complexity of soil environment, often will appear and desired effect phase
Anti- situation, to limit its application.
Therefore, for a series of problems existing in the prior art and defect, it is necessary to which research and development can overcome repairing effect not
Significantly, there are secondary pollution and the inapparent heavy metal lead pollution soil stabilizer of low concentration Available Lead pollution amelioration and preparations
Method.
Summary of the invention
That the purpose of the present invention is to solve heavy metal-polluted soil lead contamination repairing effects present in background technique is not significant,
There are secondary pollution and the inapparent problems of low concentration Available Lead pollution amelioration, and a kind of heavy-metal contaminated soil proposed is repaired
Multiple material and its restorative procedure.
The present invention is achieved through the following technical solutions above-mentioned purpose, a kind of preparation of heavy metal lead pollution soil stabilizer
Method, comprising the following steps:
(1) it prepares raw material: dry clay mineral, zeolite, white lime is ground into raw material powder respectively；
(2) mixed raw material: in proportion by smashed raw material powder uniform stirring, mixed raw material is obtained；
(3) material modification: mixed raw material is subjected to active purge and heat treatment, obtains modified soil stabilization
Agent.
As preferred: the mixed raw material CLAY MINERALS AND THEIR SIGNIFICANCE, zeolite, white lime are with parts by weight are as follows: clay mineral 30-80
Part, 15-50 parts of zeolite, 5-40 parts of white lime.
As preferred: the heat treatment process includes:
(a) the pre-heat treatment: to carry out the pre-heat treatment to mixed raw material under conditions of 50-180 DEG C；
(b) stablize processing: to carry out stablizing processing to mixed raw material under conditions of 20-80 DEG C；
(c) calcination processing: to carry out calcination processing to mixed raw material under conditions of 150-450 DEG C.
As preferred: the time of the pre-heat treatment is 2-4 hours.
As preferred: the time of the stable processing is 0.5-2 hours.
As preferred: the time of the calcination processing is 3-7 hours.
As preferred: the active purging is purged to be purged using inert gas or nitrogen to mixed raw material surface
Amount is 300-1000 ls/h.
As preferred: particle based on quantity at least 70% has the partial size of 3-30um in the raw material powder.
As preferred: the zeolite is analcime, heulandite, scolecite, needle stone, chabasie, modenite or tiltedly sends out
One of zeolite or more than one mixture.
The present invention also provides a kind of heavy metal lead pollution soil stabilizers, are made by using above-mentioned preparation method.
Compared with prior art, the beneficial effects of the present invention are:
Zeolite powder surface have many marshallings bug hole and duct, have biggish specific surface area, inside can
A large amount of microelement is accommodated, there is good adsorption effect to heavy metal, and adsorption effect is far more than active carbon, it is specific natural
The effect of molecular sieve.
Processing is modified to zeolite by way of heat modification, zeolite surface and micropore can be removed in modifying process
Organic or inorganic impurity in road, the exchange capacity for improving Unit Weight zeolite improve the suction of zeolite to accelerate exchange rate
Attached effect；And adjustment is re-started by cation of the high temperature to zeolite interior, improve zeolite surface bug hole and duct for
The adsorption effect of free state heavy metal lead ion.
Zeolite is by high temperature heat modification, the organic heated volatilization in part in surface and microchannel, from zeolite powder and viscous
It is run out of in native mineral, so that the volume of these micropore cavities increases, improves the suction-operated of zeolite；Thermally-denatured same
When, mixed raw material surface is purged using inert gas or nitrogen, the purging of gas can be by the organic matter of heated volatilization
It takes away, and is discharged outside heating furnace from zeolite group mineral surface, so that zeolite is in the stable gaseous environment of relative clean, prevented
The part organic gas of discharge zeolite granular continues to be accumulated in zeolite granular surface, with the reduction of temperature, part organic gas
Again cooling is solidificated in zeolite granular surface, and to its duct, cavity is blocked, and the absorption fixed effect of zeolite is caused to decline.
The soil stabilizer is in use, high for the lead ion treatment effeciency of the free state in soil, effect
Significantly；By adding white lime in soil stabilizer, white lime is mixed into soil and can carry out to the acid-base property of soil
It adjusts, so that the pH value of soil slightly rises, neutralization reaction can be played to the acid ingredient in acid soil, alleviate soil acid
High harm is spent, the pH value of soil is enabled to tend to be neutral, to play the role of improveing soil.Calcium in white lime
The crumb structure in soil can be improved, keep soil more loose penetrating, soil have the effect of it is preferably ventilative, permeable,
To be conducive to the growth of plant.
In turn, the lead ion of the free state in soil can in soil acid ion, formed in conjunction with nonmetallic ion
Lead salt sediment enables the free state lead ion in soil to be fixed, zeolite, clay mineral in soil stabilizer
It can be repaired the fixed package of material absorption, form tens nanometers of microcapsules to micron level, heavy metal is prevented to enter liquid phase
And absorbed by crop root system and animal skin, it is also insoluble in rainwash and underground water, significantly reduces soil and water resources dirt
The risk of dye, to reach the reparation of the heavy metal lead in soil.
The soil stabilizer can have remarkable result to the free state lead ion processing of high-concentration and low-concentration in soil, pass through
Zeolite and other clay minerals handle the free state lead ion in soil, and zeolite and other clay mineral surfaces can
It reacts, the compound that lead ion combines the solid-state formed hard to tolerate is adsorbed, and clay mineral energy with the lead ion of free state
The high sensitivity of enough association reaction free state lead ions is in zeolite, but its clay mineral inhales the reaction of the lead ion of free state
Rate of producing effects is lower than the adsorption efficiency of zeolite, can make up to the concentration range of zeolite ion exchange interaction adsorpting lead ion；
Initial stage, the free state lead ion in soil is mainly by the absorption of zeolite granular, when zeolite is to free in soil
When the lead of state is from being adsorbed onto a certain amount of, the adsorption effect of zeolite tends towards stability, and adsorption efficiency reduces, at this point, clay mineral can
Continue to carry out reaction absorption to the lead ion of the free state of low concentration, and then improves soil-repairing agent for a huge sum of money in soil
Belong to lead stablizing effect.
Clay mineral is formed by high-temperature calcination, internal to have a large amount of irregular micropores, is advised compared to zeolite interior
Cellular structure then, the porous structure inside clay mineral have the characteristics that unformed, and the size of micropore is compared to zeolite
Pore diameter range distribution is more extensive, can adsorb biggish particulate matter.It is compound for heavy metal can to further compensate for modified zeolite
The adsorption range of object forms it into based on modified zeolite, and partial clay mineral is the soil stabilizer of auxiliary, to improve
The adsorption effect of soil stabilizer.
In conclusion the present invention is by using using natural zeolite, clay mineral and white lime as soil stabilizer
Main component has carried out modification by surface of the thermally-denatured mode of high temperature to mineral, has improved other mineral such as zeolite
Adsorption efficiency and absorption specific aim to heavy metal lead, it is environmentally protective, it is added in soil, does not will cause secondary pollution；?
Only soil stabilizer need to be simply blended in soil to be repaired in soil remediation treatment process, uniformly be mixed
It closes, and keeps the water content in soil, so that the property easy to use of soil stabilizer is improved, it is easy to operate, reduce soil
The cost of earth reparation enables the soil stabilizer to be suitable for the application and popularization of large-scale.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
A kind of preparation method of heavy metal lead pollution soil stabilizer, comprising the following steps:
(1) it prepares raw material: dry clay mineral, zeolite, white lime being ground into raw material powder respectively, wherein raw material powder
Middle particle based on quantity at least 70% has the partial size of 3-30um；
(2) mixed raw material: by 65 parts of clay mineral, 20 parts of zeolite, 15 parts of white lime raw material powder uniform stirring, obtain
Mixed raw material；
(3) material modification: mixed raw material is subjected to active purge and heat treatment, obtains modified soil stabilization
Agent.
Wherein heat treatment process includes:
(a) the pre-heat treatment: to carry out the pre-heat treatment to mixed raw material under conditions of 50 DEG C, continue 3 hours；
(b) stablize processing: to carry out stablizing processing to mixed raw material under conditions of 70 DEG C, continuing 1 hour；
(c) calcination processing: to carry out calcination processing to mixed raw material under conditions of 370 DEG C, continue 5 hours.
In heat treatment process, active purging is carried out to mixed raw material surface using inert gas or nitrogen, purging amount is 450
L/h.
Zeolite in mixed raw material is analcime, heulandite, scolecite, needle stone, chabasie, modenite or tiltedly hair boiling
One of stone or more than one mixture.Clay mineral includes modified montmorillonite used, expanded vermiculite, wherein modified montmorillonite used 45
Part, 30 parts of expanded vermiculite.
Heavy metal lead contaminated soil is repaired using soil stabilizer prepared by above-mentioned steps, the soil stabilizer
Experimental result it is as follows:
(1) same contaminated soil sample is taken, takes 5 groups of contaminated soil samples respectively, the grammes per square metre in sample: one 99 grams of sample,
2 98 grams of sample, 3 97 grams of sample, 4 96 grams of sample, 5 95 grams of sample；
(2) soil stabilizer is added in soil sample, mixes well, matches out the soil stabilizer of various concentration,
Soil stabilizer grammes per square metre is added in sample are as follows: one 1 grams of sample, 22 grams of sample, 33 grams of sample, 44 grams of sample, 55 grams of sample；
(3) it is separately added into the pure water of 30% vehicle weight in Xiang Suoyou sample, mixes well, and stands 1 day, 3 days, 5
It, 7 days；
(4) by using the inspection in GB/T23739-2009 " soil quality Available Lead and Cadmium detrmination atomic absorption method "
Survey mode is measured the content of the Available Lead in experiment sample, and records the original value in contaminated soil sample and repair
Complex value, testing result is as shown in following table one:
Table one: the effect experiment table of soil stabilizer
Soil stabilizer in the present invention is by using using natural zeolite, clay mineral and white lime as soil stabilization
The main component of agent has carried out modification by surface of the thermally-denatured mode of high temperature to mineral, improve zeolite etc. other
The adsorption efficiency and absorption specific aim of Mineral pairs heavy metal lead, it is environmentally protective, it is added in soil, does not will cause secondary dirt
Dye；Only soil stabilizer need to be simply blended in soil to be repaired, be carried out equal in soil remediation treatment process
Even mixing, and the water content in soil is kept, so that the property easy to use of soil stabilizer is improved, it is easy to operate, it reduces
The cost of soil remediation enables the soil stabilizer to be suitable for the application and popularization of large-scale.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where 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, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (10)
1. a kind of preparation method of heavy metal lead pollution soil stabilizer, which comprises the following steps:
(1) it prepares raw material: dry clay mineral, zeolite, white lime is ground into raw material powder respectively；
(2) mixed raw material: in proportion by smashed raw material powder uniform stirring, mixed raw material is obtained；
(3) material modification: mixed raw material is subjected to active purge and heat treatment, obtains modified soil stabilizer.
2. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 1, which is characterized in that described
Mixed raw material CLAY MINERALS AND THEIR SIGNIFICANCE, zeolite, white lime are with parts by weight are as follows: 30-80 parts of clay mineral, 15-50 parts of zeolite, white lime
5-40 parts.
3. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 1, which is characterized in that described
Heat treatment process includes:
(a) the pre-heat treatment: to carry out the pre-heat treatment to mixed raw material under conditions of 50-180 DEG C；
(b) stablize processing: to carry out stablizing processing to mixed raw material under conditions of 20-80 DEG C；
(c) calcination processing: to carry out calcination processing to mixed raw material under conditions of 150-450 DEG C.
4. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 3, which is characterized in that described
The time of the pre-heat treatment is 2-4 hours.
5. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 3, which is characterized in that described
The time for stablizing processing is 0.5-2 hours.
6. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 3, which is characterized in that described
The time of calcination processing is 3-7 hours.
7. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 1, which is characterized in that described
Actively for purging to be purged using inert gas or nitrogen to mixed raw material surface, purging amount is 300-1000 ls/h.
8. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 1, which is characterized in that described
Particle based on quantity at least 70% has the partial size of 3-30um in raw material powder.
9. a kind of preparation method of heavy metal lead pollution soil stabilizer according to claim 1, which is characterized in that described
Zeolite be one of analcime, heulandite, scolecite, needle stone, chabasie, modenite or clinoptilolite or more than one
Mixture.
10. a kind of heavy metal lead pollution soil stabilizer, which is characterized in that by claim 1-9 any one preparation method system
?.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111100644A (en) * | 2019-12-30 | 2020-05-05 | 浙江中地净土科技有限公司 | Microcapsule composite material for Cd and Pb polluted soil, preparation method and restoration method |
| CN111745811A (en) * | 2020-06-12 | 2020-10-09 | 浙江省生态环境科学设计研究院 | Pre-kiln pretreatment method for preparing ceramsite by aiming at heavy metal contaminated soil |
| CN115651665A (en) * | 2022-10-24 | 2023-01-31 | 四川正升环保科技有限公司 | Lead-polluted soil remediation agent, application thereof and method for remediating lead-polluted soil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111100644A (en) * | 2019-12-30 | 2020-05-05 | 浙江中地净土科技有限公司 | Microcapsule composite material for Cd and Pb polluted soil, preparation method and restoration method |
| CN111745811A (en) * | 2020-06-12 | 2020-10-09 | 浙江省生态环境科学设计研究院 | Pre-kiln pretreatment method for preparing ceramsite by aiming at heavy metal contaminated soil |
| CN111745811B (en) * | 2020-06-12 | 2021-07-27 | 浙江省生态环境科学设计研究院 | Pre-kiln pretreatment method for preparing ceramsite by aiming at heavy metal contaminated soil |
| CN115651665A (en) * | 2022-10-24 | 2023-01-31 | 四川正升环保科技有限公司 | Lead-polluted soil remediation agent, application thereof and method for remediating lead-polluted soil |
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