CN106623400A - Method for remedying heavy metal contaminated soil through passivation - Google Patents
Method for remedying heavy metal contaminated soil through passivation Download PDFInfo
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- CN106623400A CN106623400A CN201611022466.7A CN201611022466A CN106623400A CN 106623400 A CN106623400 A CN 106623400A CN 201611022466 A CN201611022466 A CN 201611022466A CN 106623400 A CN106623400 A CN 106623400A
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- red mud
- heavy metal
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- passivation
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
Abstract
The invention provides a method for remedying heavy metal contaminated soil through passivation. The method comprises the following steps: collecting heavy metal contaminated top soil, removing large impurity granules, performing air drying, uniformly mixing, grinding, and sieving by using a 2mm sieve; grinding dried red mud, sieving by using a 100-mesh sieve, adding deionized water for washing red mud powder, measuring the pH value of a mixed solution system by using a pH meter, and repeatedly washing till the pH value of desalinated red mud is 8, 10 or 11 to obtain the desalinated red mud; adding ferrous sulfate into the desalinated red mud obtained in the former step, adding deionized water to ensure that the water content is 40-70%, and maintaining for 7-10 days under the conditions that the temperature is 25 DEG C plus or minus 0.5 DEG C and the humidity is 95% to obtain improved red mud; adding the improved red mud obtained in the former step into the heavy metal contaminated soil according to an addition ratio that the weight of the improved red mud is 0.5-2% of the dry weight of the contaminated soil, sufficiently mixing uniformly under the condition that the water content in terms of the dry weight of the solid is 40-70%, maintaining for 25-35 days under the conditions that the temperature is 25 DEG C plus or minus 0.5 DEG C and the humidity is 95%, drying and grinding for standby application.
Description
Technical field
The present invention relates to a kind of method of passivation restoration of soil polluted by heavy metal, belongs to the side of restoration of soil polluted by heavy metal
Law technology field.
Background technology
2014《National Soil Pollution Investigation publication》Related data shows that China there are about 300,000,000 mu of arable lands and be subject to weight
Metallic pollution, soil point position exceeding standard rate is up to 19.4%, and heavy metal pollution species are mainly cadmium, arsenic, lead, wherein soil Cd
Point position exceeding standard rate has reached 7%, produces the exceeded agricultural product of Cd per year up to 1,500,000 tons, and the economic loss for thereby resulting in is more than 20,000,000,000.I
State's The Heavy Metal Contaminated Soil is serious, and heavy metal contaminants have toxicity it is big, easily accumulation, non-degradable the features such as, to ecology
Environment, grain security and health constitute a serious threat, and the repair of heavy-metal contaminated soil is extremely urgent.
At present, the recovery technique research of heavy-metal contaminated soil achieves tremendous development, mainly including physics, chemistry, life
Thing, Agro-ecology recovery technique, the heavy metal-polluted soil passivation stabilization technique wherein in chemical restoration in soil by adding
Passivation improved materials, are made using the chemical precipitation of passivating material and heavy metals in soil, chemisorbed, surface precipitation etc.
With, make heavy metal to the low toxicity Forms Transformation such as low dissolving, stationary state, reducing the dissolubility and biology of Heavy Metals in Contaminated Soils has
Effect property, so as to reduce Crop, reduce environmental risk, with repairing effect it is obvious, rehabilitation cost is low, constructing operation is simply easy
Row, soil texture is disturbed it is little, many advantages, such as be applicable to soil type.
Red mud is the discarded object with high-alkali high salt characteristic produced in aluminum oxide production process.Often produce 1 ton of oxidation
Aluminium, will produce 1～2 ton of red mud, and China is up to 700 as the fourth-largest alumina producing state of the world, the red mud of annual discharge
Ten thousand tons.Different alumina-producing methods, the red mud species of generation is also different, can be divided into Bayer process, sintering process and combination method.Mesh
Before, red mud piling up remains the Main Means for processing red mud, and the farmland for not only taking up substantial amounts of soil and preciousness is stored up for a long time, and
And the pollution to ecological environment can not be ignored.The main component of red mud is SiO2、CaO、Fe2O3、Al2O3、Na2O etc., pH value is 10
Between～12, grain diameter mostly be less than 63 μm, it migrates with the wind the dust pollution for causing, greatly compromise periphery crop,
Building surface, soil and health, or even cause underground water pollution.Different from lime, gypsum, phosphorus ore containing, Hai Pao
The conventional passivation restoring material such as stone, kaolin, fertilizer, lot of documents research shows, using the high pH of red mud and excellent
Absorption property can apply to the passivation reparation of heavy metal, can effectively reduce Heavy Metals in Contaminated Soils mobility and biologically effective
Property, moreover it is possible to the recycling of red mud is realized, passivation rehabilitation cost is effectively reduced, is a kind of utilization of resources having a extensive future
Method.But because red mud alkalescence is relatively strong, salt content is higher, directly applies and easily causes soil salinity and alkalinity increase, is unfavorable for soil profit
With the structure of function, there is potential environmental risk.
Pertinent literature retrieval shows, China Patent No. ZL201410237838.2, Authorization Notice No. CN104028538B, awards
On power April 6 2016 day for announcing, disclose the red mud after a kind of acidifying.Red mud dispensing after patent acidifying is by red mud, concavo-convex
Rod stone, clay, magnesia, sulfuric acid, quick dissolved sodium silicate, polyvinyl alcohol, hydroxypropyl methyl cellulose and sodium carbonate are constituted, and pH value is
6.5～7.5.The patent reduces very well the high alkalinity of red mud, but mainly uses the thixotropy of red mud after acidifying, thermally-stabilised
Property, plasticity, caking property, it is adaptable to produce construction material, foaming agent and fire product, fail to develop very well that red mud is high inhales
Attached performance.China Patent No. ZL201310230541.9, Authorization Notice No. CN103272836B, authorized announcement date in April, 2015
29, disclose a kind of preparation of red mud composite and its restorative procedure of heavy metal contaminated soil.The patent disclosure
The materials proportioning of red mud composite, preparation method, but material category is various, complex process, is not suitable for China large-area
The enforcement that heavy-metal contaminated soil passivation is repaired.Chinese Patent Application No. 201510733378.7, application publication number
CN105330476A, Shen Qing Publication day 2016 year 2 month 17 days, disclose a kind of red mud assisted soil repairing fertiliser, but are mainly
With charcoal as matrix, soil nutrient is improved, the heavy metal passivation to soil is repaired without data supporting, and component contains micro- life
Thing microbial inoculum, the security and persistence of fertilizer efficiency have to be seen.
The content of the invention
The invention aims to solve the problems, such as above-mentioned prior art, and then provide an a kind of passivation reparation huge sum of money
The method of category contaminated soil.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method of passivation restoration of soil polluted by heavy metal,
The preparation of step one, heavy-metal contaminated soil
Collection heavy metal pollution topsoil, rejects bulky grain debris, air-dries and mixes, and using quartering division is carried out, and grinds
2mm sieves are crossed, is preserved, it is standby；
Step 2, desalination is carried out to red mud
By dry ground 100 mesh sieve of red mud, add deionized water to wash red mud powder, deionized water plus
It is 25 times of red mud weight to enter amount, vibration stirring 5min, stands 1～3h, and determines the pH value of mixture system with pH meter, is repeated
Washing, red mud pH value is 8,10,11 to desalination, as the red mud after desalination, drying, ground 100 mesh sieve；
Step 3, desalination red mud is carried out iron be modified
Ferrous sulfate is added in the desalination red mud obtained to step 2, the addition of ferrous sulfate is desalination red mud dry weight
1～3%, addition deionized water ensure moisture content 40%～70%, stir, in temperature be 25 DEG C ± 0.5 DEG C, it is wet
Spend to conserve under conditions of 95% 7～10 days, the red mud after as improveing, drying, grinding is standby；
The heavy metal-passivated contaminated soil of red mud after step 4, addition improvement
Red mud after the improvement that step 3 is obtained is added to according to the adding proportion of contaminated soil dry weight 0.5%～2%
In heavy-metal contaminated soil, stir under conditions of the water content of dry solid weight is for 40%～70%, be in temperature
25 DEG C ± 0.5 DEG C, humidity be 95% under conditions of conserve 25～35 days, drying, grinding, it is standby.
In the step 2, red mud is the dry powder of granularity ＜ 0.125mm.
In the step 2, the pH value of red mud is 11.
In the step 3, the addition of ferrous sulfate is the 1% of red mud dry weight.
In the step 4, the content of red mud after improvement is the 0.5% of heavy metal pollution soil dry weight.
In the step 4, improvement red mud constant temperature and humidity curing time is 30 days.
In the step 4, the water content of dry solid weight is 60%.
The present invention combines soil and is passivated recovery technique, and a certain degree of desalination and modification are carried out to red mud, researches and develops base
In the passivator of the heavy-metal contaminated soil of red mud, the heavy metal that can not only be passivated in contaminated soil, moreover it is possible to real to a certain extent
The minimizing of existing red mud is processed, and mitigates the environmental risk that red mud piling up brings, and reaches the purpose of the treatment of wastes with processes of wastes against one another, realize low cost,
The exploitation of high efficiency passivation medicament and the recycling of discarded object.
Modified red mud used in the present invention, safety is efficiently, economical, is the passivation of Heavy Metals in Soil Contaminated and red
The recycling of mud provides new method, has broad application prospects.
Description of the drawings
Fig. 1 is the flow chart of the method for present invention passivation restoration of soil polluted by heavy metal.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail：The present embodiment is being with technical solution of the present invention
Under the premise of implemented, give detailed embodiment, but protection scope of the present invention is not limited to following embodiments.
1st, heavy-metal contaminated soil basic physical and chemical
With Hubei Province mining area periphery heavy-metal contaminated soil as research object.
Heavy-metal contaminated soil type is yellowish soil, and Cd full doses are 0.7mg/kg, and As full doses are 80mg/kg, and pH value is
4.97 (water：Soil=2.5:1), the content of organic matter is 2.0%, cation exchange capacity (CEC) (CEC) be 126.95cmol/kg, alkali-hydrolyzable nitrogen
Content is 173.24mg/kg, and available phosphorus content is 22mg/kg, and quick-acting potassium content is 170mg/kg.
2nd, red mud basic physical and chemical
The red mud in Shanxi Aluminum Co., Ltd overwood chapter stockyard is thrown as research object using middle electricity, the red mud is combination method work
The discarded object produced in skill production alumina process.
The pH value of red mud is 11.83, and main chemical compositions are：Ca 13.35%, Na 11.34%, Al 7.41%, Si
6.48%, Fe 6.27%, Ti 3.49%, O 40.75%, C 5.07%, K 0.30%, Mg 0.24%, V 0.10% and
Pb 0.04%.Specific surface area is 10.18m2g～1, electrical conductivity is 2.3dS m～1.Particle size distribution range between 0.9～68 μm,
Average grain diameter is 9.72 μm.TOC contents are 8.54g/kg.The main mineral constituent of red mud includes plus rattan stone (Ca3Al2(SiO4)
(OH)8), sodalite ((Na6Al6Si6O24)·2Na2SO4), cancrinite (CaCO3) and bloodstone (Fe2O3)。
It is above-mentioned to show, red mud be it is a kind of with high calcium, high sodium, high alkalinity silty trade waste, it is necessary to through improvement,
The raw material of the passivation medicament for being applied to heavy-metal contaminated soil reparation can just be become.
3rd, it is passivated the method for restoration of soil polluted by heavy metal
Affecting the technical factor of passivation restoration of soil polluted by heavy metal mainly has two aspects, and one is passivating material to soil
Property disturbance is less, it is to avoid cause the salinization of soil and increase-volume；Two is that the addition of passivating material promotes Heavy Metals to become
Change, reduce biological effectiveness.Therefore, for the validity of heavy metal-passivated Heavy Metals in Contaminated Soils, contaminated soil is lifted
Safe utilization rate, can be certain modified realizing by the way that red mud is carried out.Using technical scheme be high-alkali using red mud
Property and good absorption property develop efficient heavy metal and be passivated product, red mud after addition improvement, it is determined that optimum changes
Property condition and most suitable passivation addition, realize the safe utilization of heavy-metal contaminated soil.
1) red mud amelioration
Red mud is improved using deionized water and ferrous sulfate, the deionized water for being used is obtained by ultrapure water machine,
Used ferrous sulfate is the pure rank of analysis, and degree is more than 90%, and granularity is 0.18mm.The detailed step of ameliorative measure
It is：The hardened red mud of drying is crushed first, secondly adds a certain amount of deionized water to carry out the wash-out of salinity in red mud, pressed
The measure of pH is carried out according to the bioassay standard (GB/T 7859～1987) of soil pH value, and changes water washing, be respectively to red mud pH value
8th, 10,11, drying and grinding.Ferrous sulfate, addition is added to be the 1%～3% of red mud dry weight in the last red mud after washing,
Add a certain amount of water again to adjust moisture content is 40%～70%, is stirred well to and is well mixed, and is placed in temperature for 25 DEG C ± 0.5
DEG C, in the thermostatic curing case that humidity is 95% aging more than 7 days (7～10 days).
Preferably, red mud pH value is 11 after washing.
Preferably, the granularity of red mud dry powder is 0.125mm.
Preferably, moisture content is 70%.
Preferably, ageing time is 8 days.
In the preferred case, according to sulfuric acid～nitric acid leaching method (HJ/T299～2007), from the leaching that pH value is 3.2
(mass ratio is 2 to propose agent:1 sulfuric acid, nitric acid mixed liquor), liquid-solid ratio is 10:1, regulation rotating speed is 30 ± 2r/min, in 23 ± 2
18h is vibrated at DEG C, with the chemical stability of this red mud after differentiating to improve and with the presence or absence of potential hazard.After extraction terminates, with
Rotating speed is that 3000r/min is centrifuged 30min, and with 0.45 μm of membrane filtration supernatant, test analysis, nuisance in red mud after improvement
Matter leaching concentration is as shown in table 1.
After improveing to red mud, the leaching concentration of the metal such as Cr, Mn, Fe, Co, Ni, Zn, As, Cd, Pb is in underground water
Below four class standard limit values, especially As, the leaching concentration of red mud is 56.24 μ g/L, has exceeded underground water agricultural water standard,
Jing after ferrous sulfate improvement, leaching concentration is significantly reduced, and largely alleviates red mud passivation restoration of soil polluted by heavy metal
Environmental risk.
After improveing under the optimum condition of table 1 in red mud poisonous and harmful substance leaching concentration (μ g/L)
2) red mud restoration of soil polluted by heavy metal after improveing
Certain mining area periphery heavy-metal contaminated soil is gathered, larger particles debris are rejected, natural air drying is mixed, ground 2mm
Screen cloth, is repaired using the red mud passivation after improvement.Detailed Passivation Treatment measure is included：A certain amount of Polluted Soil is weighed first
In experiment container, the red mud after improvement, addition is secondly added to be the 0.5%～2% of Polluted Soil quality, add a certain amount of
Deionized water adjust moisture content be 40%～70%, be stirred well to and be well mixed, in temperature be 25 DEG C ± 0.5 DEG C, humidity
To conserve 25～35 days under conditions of 95%.
Preferably, the red mud granularity containing ferrous sulfate is the dry powder of 0.125mm, and the addition of ferrous sulfate is dry for red mud
The 1% of weight.
Preferably, the addition of iron modified red mud is the 0.5% of contaminated soil total amount.
Preferably, the water yield is added for the 60% of solid amount.
Preferably, it is best suitable for heavy-metal contaminated soil.
Embodiment 1
Passivation Treatment is tested：Weighed the heavy-metal contaminated soil 100g of 2mm screen clothes respectively, numbering be 1., 2., 3., 4.,
5., 6., the iron modified red mud dry powder 0.5g of different improved treatments is sequentially added, corresponding improved treatment is：1. desalination red mud pH
=8, ferrous sulfate addition is 1% (being designated as CRM～8～1%)；2. desalination red mud pH=8, ferrous sulfate addition is 3%
(being designated as CRM～8～3%)；3. desalination red mud pH=10, ferrous sulfate addition is 1% (being designated as CRM～10～1%)；4. take off
Salt red mud pH=10, ferrous sulfate addition is 3% (being designated as CRM～10～3%)；5. desalination red mud pH=11, ferrous sulfate
Addition is 1% (being designated as CRM～11～1%)；6. desalination red mud pH=11, ferrous sulfate addition be 3% (be designated as CRM～
11～3%)；Add the deionized water of 60.3mL, be sufficiently stirred in uniform pulpous state, in temperature be 25 DEG C ± 0.5 DEG C, humidity be
Conserve under conditions of 95%.Maintenance is sampled after 25～35 days, drying, and 0.125mm screen clothes are crossed in grinding, according to sulfuric acid～nitric acid leaching
Go out method (HJ/T299～2007) to extract and analyze detection, as a result as shown in table 2.
The passivation effect (0.5% addition) of the iron modified red mud heavy metal contaminated soil of table 2
Embodiment 2
Passivation Treatment is tested：Weighed the heavy-metal contaminated soil 100g of 2mm screen clothes respectively, numbering be 1., 2., 3., 4.,
5., 6., the iron modified red mud dry powder 1g of different improved treatments is sequentially added, corresponding improved treatment is：1. desalination red mud pH=
8, ferrous sulfate addition is 1% (being designated as CRM～8～1%)；2. desalination red mud pH=8, ferrous sulfate addition is 3% (note
For CRM～8～3%)；3. desalination red mud pH=10, ferrous sulfate addition is 1% (being designated as CRM～10～1%)；4. desalination
Red mud pH=10, ferrous sulfate addition is 3% (being designated as CRM～10～3%)；5. desalination red mud pH=11, ferrous sulfate adds
Dosage is 1% (being designated as CRM～11～1%)；6. desalination red mud pH=11, ferrous sulfate addition (is designated as CRM～11 for 3%
～3%)；Add the deionized water of 60.6mL, be sufficiently stirred in uniform pulpous state, in temperature be 25 DEG C ± 0.5 DEG C, humidity be
Conserve under conditions of 95%.Maintenance is sampled after 25～35 days, drying, and 0.125mm screen clothes are crossed in grinding, according to sulfuric acid～nitric acid leaching
Go out method (HJ/T299～2007) to extract and analyze detection, as a result as shown in table 3.
The passivation effect (1% addition) of the iron modified red mud heavy metal contaminated soil of table 3
Embodiment 3
Passivation Treatment is tested：Weighed the heavy-metal contaminated soil 100g of 2mm screen clothes respectively, numbering be 1., 2., 3., 4.,
5., 6., the iron modified red mud dry powder 2g of different improved treatments is sequentially added, corresponding improved treatment is：1. desalination red mud pH=
8, ferrous sulfate addition is 1% (being designated as CRM～8～1%)；2. desalination red mud pH=8, ferrous sulfate addition is 3% (note
For CRM～8～3%)；3. desalination red mud pH=10, ferrous sulfate addition is 1% (being designated as CRM～10～1%)；4. desalination
Red mud pH=10, ferrous sulfate addition is 3% (being designated as CRM～10～3%)；5. desalination red mud pH=11, ferrous sulfate adds
Dosage is 1% (being designated as CRM～11～1%)；6. desalination red mud pH=11, ferrous sulfate addition (is designated as CRM～11 for 3%
～3%)；Add the deionized water of 61.2mL, be sufficiently stirred in uniform pulpous state, in temperature be 25 DEG C ± 0.5 DEG C, humidity be
Conserve under conditions of 95%.Maintenance is sampled after 25～35 days, drying, and 0.125mm screen clothes are crossed in grinding, according to sulfuric acid～nitric acid leaching
Go out method (HJ/T299～2007) to extract and analyze detection, as a result as shown in table 4.
The passivation effect (2% addition) of the iron modified red mud heavy metal contaminated soil of table 4
Comparative example 1
Passivation Treatment is tested：Weighed the heavy-metal contaminated soil 100g of 2mm screen clothes respectively, numbering be 1., 2., 3., 4.,
5., 6., 7., 8., 9., 10., be separately added into a certain amount of red mud or desalination red mud dry powder (be designated as RM respectively, CRM～8,
CRM～10, CRM～11) and deionized water, corresponding improved treatment is：1. red mud addition be 0.5g, deionized water addition
For 60.3mL；2. CRM～8 addition is 0.5g, deionized water addition is 60.3mL；3. CRM～10 addition is 0.5g,
Deionized water addition is 60.3mL；4. CRM～11 addition is 0.5g, and deionized water addition is 60.3mL；5. red mud adds
It is 1g to enter amount, and deionized water addition is 60.6mL；6. CRM～8 addition is 1g, deionized water addition is 60.6mL；⑦
CRM～10 addition is 1g, and deionized water addition is 60.6mL；8. CRM～11 addition is 1g, and deionized water addition is
60.6mL；9. red mud addition is 2g, and deionized water addition is 61.2mL；10. CRM～8 addition is 2g, deionized water
Addition is 61.2mL；CRM～10 addition is 2g, and deionized water addition is 61.2mL；CRM～11 addition is
2g, deionized water addition is 61.2mL；Be sufficiently stirred in uniform pulpous state, in temperature be 25 DEG C ± 0.5 DEG C, humidity be 95%
Under the conditions of conserve.Maintenance is sampled after 25～35 days, drying, and grinding crosses 0.125mm screen clothes, according to sulfuric acid～nitric acid leaching method
(HJ/T299～2007) extract and analyze detection, as a result as shown in table 5.
The passivation effect of the desalination red mud heavy metal contaminated soil of table 5
Can be seen that the iron modification to desalination red mud by embodiment and comparative example can significantly improve the passivation of heavy metal
Under the conditions of effect, especially 0.5% addition, for heavy metal cadmium, the treatment effect of CRM～11～1% group is than CRM～11 group
Want high by 38.2%, reached 88.1% to the deactivation rate of cadmium, and heavy metal arsenic, deactivation rate is passivated with iron ion ratio and red mud
The increase of the adding proportion of material and increase, but because CRM～11～1% and CRM～11～3% group are in 0.5%～2% addition
More than 90% has been reached in proportion, and increasing degree is slow.Reach passivation target while take into account financial cost and
Environment friendly, it is that repairing heavy metal pollution soil is passivated in the present invention that CRM～11～1% group adding proportion is 0.5% condition
The best practice of earth.
While the red mud amelioration material of the present invention can effectively reduce Heavy Metals in Contaminated Soils biologically effective state, also eliminate
The perniciousness harm of red mud resource utilization, it is to avoid adverse effect to soil physico-chemical property, so as to realize to contaminated soil
The passivation of middle heavy metal substance.
The above, preferably specific embodiment only of the invention, these specific embodiments are all based on the present invention
Different implementations under general idea, and protection scope of the present invention is not limited thereto, it is any to be familiar with the art
Technical staff the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should cover the present invention
Within protection domain.Therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (7)
1. it is a kind of passivation restoration of soil polluted by heavy metal method, it is characterised in that step is as follows：
The preparation of step one, heavy-metal contaminated soil
Collection heavy metal pollution topsoil, rejects bulky grain debris, air-dries and mixes, and using quartering division, ground 2mm are carried out
Sieve, preserves, standby；
Step 2, desalination is carried out to red mud
By dry ground 100 mesh sieve of red mud, deionized water is added to wash red mud powder, the addition of deionized water
For 25 times of red mud weight, vibration stirring 5min stands 1～3h, and determines the pH value of mixture system with pH meter, and repetition is washed
Wash, red mud pH value is 8,10,11 to desalination, as the red mud after desalination, drying, ground 100 mesh sieve；
Step 3, desalination red mud is carried out iron be modified
Add ferrous sulfate in the desalination red mud obtained to step 2, the addition of ferrous sulfate for desalination red mud dry weight 1～
3%, addition deionized water ensure moisture content 40%～70%, stir, in temperature be 25 DEG C ± 0.5 DEG C, humidity
To conserve under conditions of 95% 7～10 days, the red mud after as improveing, drying, grinding is standby；
The heavy metal-passivated contaminated soil of red mud after step 4, addition improvement
Red mud after the improvement that step 3 is obtained is added to a huge sum of money according to the adding proportion of contaminated soil dry weight 0.5%～2%
Category contaminated soil in, dry solid weight water content be 40%～70% under conditions of stir, in temperature be 25 DEG C
± 0.5 DEG C, humidity be 95% under conditions of conserve 25～35 days, drying, grinding, it is standby.
2. it is according to claim 1 passivation restoration of soil polluted by heavy metal method, it is characterised in that the step 2
In, red mud is the dry powder of granularity ＜ 0.125mm.
3. it is according to claim 1 passivation restoration of soil polluted by heavy metal method, it is characterised in that the step 2
In, the pH value of red mud is 11.
4. it is according to claim 1 passivation restoration of soil polluted by heavy metal method, it is characterised in that the step 3
In, the addition of ferrous sulfate is the 1% of red mud dry weight.
5. it is according to claim 1 passivation restoration of soil polluted by heavy metal method, it is characterised in that the step 4
In, the red mud passivating material addition after improvement is the 0.5% of heavy metal pollution soil dry weight.
6. it is according to claim 1 passivation restoration of soil polluted by heavy metal method, it is characterised in that the step 4
In, improvement red mud constant temperature and humidity curing time is 30 days.
7. it is according to claim 1 passivation restoration of soil polluted by heavy metal method, it is characterised in that the step 4
In, the water content of dry solid weight is 60%.
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| CN108048109A (en) * | 2017-12-20 | 2018-05-18 | 北京东方复地环境科技有限公司 | It is a kind of for multi-functional passivator of paddy fields in south china heavy metal-polluted soil Cd and preparation method thereof |
| CN108219794A (en) * | 2017-12-30 | 2018-06-29 | 上海康恒环境修复有限公司 | One kind repairs medicament and application method for Wheat in Northern growing area farmland cadmium pollution soil |
| CN109777437A (en) * | 2019-03-06 | 2019-05-21 | 昆明理工大学 | A kind of preparation method of heavy metal curing agent |
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| CN109777437A (en) * | 2019-03-06 | 2019-05-21 | 昆明理工大学 | A kind of preparation method of heavy metal curing agent |
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| CN111014267B (en) * | 2019-12-26 | 2021-11-02 | 郑州大学 | Compound comprehensive red mud ecological restoration system and restoration method |
| CN111014267A (en) * | 2019-12-26 | 2020-04-17 | 郑州大学 | Compound comprehensive red mud ecological restoration system and restoration method |
| CN111872100A (en) * | 2020-07-14 | 2020-11-03 | 天津绿缘环保工程股份有限公司 | Method for restoring petroleum hydrocarbon contaminated soil |
| CN111842473A (en) * | 2020-07-29 | 2020-10-30 | 上海傲江生态环境科技有限公司 | Method for treating heavy metal contaminated soil by using macromolecular alcohol chelating agent |
| CN113617820A (en) * | 2021-08-18 | 2021-11-09 | 东华大学 | Passivation method and application of heavy metals in red mud |
| CN115041141A (en) * | 2022-06-14 | 2022-09-13 | 山东大学 | Composite charcoal adsorbent and preparation method and application thereof |
| CN115041141B (en) * | 2022-06-14 | 2023-08-25 | 山东大学 | Composite biochar adsorbent and preparation method and application thereof |
| CN116351855A (en) * | 2023-05-17 | 2023-06-30 | 江苏集萃功能材料研究所有限公司 | Method for recycling red mud solid waste by crystal modification coupling mineralization technology |
| CN116351855B (en) * | 2023-05-17 | 2023-08-15 | 江苏集萃功能材料研究所有限公司 | Method for recycling red mud solid waste by crystal modification coupling mineralization technology |
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Application publication date: 20170510 |