CN107814544A - A kind of curing agent and methods for making and using same for Compound Heavy Metals soil - Google Patents
A kind of curing agent and methods for making and using same for Compound Heavy Metals soil Download PDFInfo
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- CN107814544A CN107814544A CN201711114557.8A CN201711114557A CN107814544A CN 107814544 A CN107814544 A CN 107814544A CN 201711114557 A CN201711114557 A CN 201711114557A CN 107814544 A CN107814544 A CN 107814544A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/16—Acids or salts thereof containing phosphorus in the anion, e.g. phosphates
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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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/12—Water-soluble silicates, e.g. waterglass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The present invention is a kind of curing agent and methods for making and using same for Compound Heavy Metals soil.The material includes pulverized limestone, flyash, activated steel slag powder, potassium dihydrogen phosphate.Wherein flyash quality is the 20%~50% of quality of materials, and activated steel slag powder quality is the 30%~50% of quality of materials, and pulverized limestone quality accounts for the 10%~30% of material gross mass, and potassium dihydrogen phosphate quality is the 0.5%~2% of gross mass.The curing agent can significantly reduce heavy metals mobilization and toxicity leaching content in heavy metal polluted soil, be particularly suitable for use in the acid pollution place that content of beary metal is high and pollutant kind is more, Polluted Soil can be used as environmentally friendly material recycling after repairing, and significantly reduce the environmental risk in the second development and utilization of contaminated site；Meanwhile the preparation process and methods for using them of the curing agent is also provided, the curing agent raw material are easily obtained, cost is cheap, it is simple to prepare, easy to use, effect stability, and the heavy metals immobilization in combined pollution place that can be in large-scale application is stabilized in reparation.
Description
Technical field
The invention belongs to civil engineering, environmental project, environmental geotechnical technical field, particularly, is related to a kind of multiple
Close the curing agent and methods for making and using same of heavy metal pollution site remediation.
Background technology
The heavy metal pollution of industrial pollution place is rendered as the features such as heavy metal species is complicated, acidity is big and content is high.
In the repair process in heavy metal pollution place, solidification and stabilization technology is widely adopted.Solidification and stabilization technology is by curing agent
Stirred with heavy-metal contaminated soil, by means such as physically encapsulation, chemisorbed and crystalline deposits, reach closing
Pollutant, reduce the purpose of environmental risk.It is solid that conventional curing agent mainly includes material, the heavy metals such as cement and ground phosphate rock
Change to stabilize and there is good effect, but there is the shortcomings of big, seriously polluted, cost is high of being consumed energy in production process.
In summary, there are many shortcomings in conventional curing agents, it is desirable to reduce the use of cement and phosphate material, find one
Kind can solidification and stabilization heavy metal, while the extensive Novel curing agent of inexpensive, environment-friendly and material source turn into environmental protection
Scientific worker's focus of attention.
The content of the invention
Technical problem：The technical problem to be solved in the present invention is：A kind of solidification for Compound Heavy Metals soil is provided
Agent and methods for making and using same, the curing agent can significantly reduce harm of the heavy metal polluted soil to surrounding environment, suitable for weight
The contaminated site that tenor is high and pollutant is complicated, environmentally friendly material recycling profit can be used as after contaminated soil remediation
With the environmental risk in contaminated site second development and utilization is greatly lowered；Meanwhile also provide the preparation method of the curing agent
And methods for using them, the curing agent raw material are easily obtained, prepare that simple, cost is cheap, easy to use, effect stability, can be
Large-scale promotion application in Compound Heavy Metals place.
Technical scheme：A kind of in order to solve the above technical problems, curing agent for Compound Heavy Metals soil of the present invention
It is composed of the following components according to percentage by weight：
Pulverized limestone：10%~30%
Fine coal ashes：20%~50%
Activated steel slag powder：30%~50%；
Potassium dihydrogen phosphate：0.5%~2%.
Wherein, described pulverized limestone is made in the following manner：By technical grade lime in baking oven with 100~150 DEG C
Temperature is dried, and to mass conservation, levigate aperture of crossing is sieved less than 0.075mm after cooling, is then placed in temperature as 140~160 DEG C
Electric furnace in calcining 0.5~1 hour after, obtain pulverized limestone.
Described flyash powder is made in the following manner：National standard two level above flyash is sieved, takes particle diameter
Component less than 2mm is placed in baking oven, is passed through the airflow drying that temperature is 100~150 DEG C, is reduced to its moisture content
Less than 2%, aperture is crossed after cooling and is sieved less than 0.075mm, after being calcined 1~2 hour by 500~700 DEG C of electric furnaces, obtains powder
Coal ash powder.
Described potassium dihydrogen phosphate, which is prepared by the following method, to be formed：PHOSPHORIC ACID TECH.GRADE potassium dihydrogen is positioned over baking oven
It is interior, by the airflow drying that temperature is 100~150 DEG C, its moisture content is less than 2%, grind and aperture excessively is less than 0.075mm
Sieve, obtains potassium dihydrogen phosphate powder.
Described activated steel slag powder, which is prepared by the following method, to be formed：By steel-making slag powder and water glass solution according to solid-to-liquid ratio
5:1~10:1 ratio is mixed, and at 30~35 DEG C of temperature, it is small that concussion stirring stirring stands 36~72 in 12~24 hours
Shi Hou, compound is placed in baking oven, is passed through the airflow drying that temperature is 100~250 DEG C, its moisture content is less than 2%, so
Ball milling and cross aperture afterwards and be less than 0.075mm and sieve, obtained activated steel slag powder.
Described steel-making slag powder is made by the following method：Water quenching converter slag is carried out broken and crosses 2mm sieves, passes through temperature
For 100~200 DEG C of airflow drying, its moisture content is less than 2%, then grind and cross 200 mesh sieves, then by 600~700
After DEG C electric furnace is calcined 2~3 hours, steel-making slag powder is obtained.
The preparation method of the curing agent for being used for Compound Heavy Metals soil of the present invention comprises the following steps：By pulverized limestone,
Fine coal ashes, activated steel slag powder and potassium dihydrogen phosphate are mixed, and the percentage by weight of wherein each component is：Pulverized limestone：
10%~30%, fine coal ashes：20%~50%, activated steel slag powder：30%~50%, potassium dihydrogen phosphate：0.5%~2%；
Using dry stirring 1~2 hour, make it is well mixed after cross aperture and be less than 0.075mm sieves, obtain the curing agent.
The present invention be used for Compound Heavy Metals soil curing agent application process be by the curing agent with it is heavy metal-polluted
Dye soil carries out original position and mixed and stirred, and curing agent quality accounts for the 5%~10% of Polluted Soil dry ground quality, and contaminated soil moisture control exists
Between 15%~35%.
Described heavy metal polluted soil is less than 0.075mm soil particles content and is more than 65%, and wherein content of heavy metal lead is more than
2000mg/kg, heavy metal zinc content are more than 2000mg/kg, and heavy metal cadmium content is more than 500mg/kg.
Beneficial effect：Compared with the solidification and stabilization effect of existing medicament heavy metal, technical scheme has
Following beneficial effect：
1) heavy metals immobilization effect is good.Limited, lime alkali-activated carbonatite slag and flyash form unbodied three-dimensional netted knot
Structure, heavy metal is firmly wrapped up, make its solidification effect excellent.Secondly, potassium dihydrogen phosphate can effectively fix heavy metal, be formed
Calcium phosphate precipitation, increase the solidification effect of heavy metal.
2) waste material, environmentally friendly curing agent are effectively utilized.First, slag and flyash are as a kind of Industry Waste
Slag, produced and accumulated on a large scale, had resulted in serious environmental pollution, by being excited to slag and flyash, greatly
The big value for improving slag and flyash, turns waste into wealth, the treatment of wastes with processes of wastes against one another.Secondly, by adding potassium dihydrogen phosphate, increase
The solidification effect of the strong curing agent heavy metal.
3) durable performance is good.Conventional curing agents are easily corroded by carbon dioxide and acid-rain corrosion is influenceed, solid so as to weaken it
Change effect.Curing agent in the present invention can effectively overcome disadvantages mentioned above, because the heavy phosphates class of generation precipitates, its
Solubility is relatively low under complex environment, and in slag and flyash after lime excites hydrated product C-A-S-H gels
Under package action, contact of the heavy metal precipitation with acid-base solution can be greatly decreased；Other slag in itself there is extremely strong acid to delay
Ability and the ability of absorbing carbon dioxide are rushed, under carbon dioxide corrosion function, generation CaCO3 crystal further fills solidification
The hole of soil, infiltrating for acid solution is effectively reduced, further enhances stability of the solidified earth under complex environment.
Embodiment
With reference to embodiment, technical scheme is described in detail.
A kind of curing agent for Compound Heavy Metals soil of the present invention is according to percentage by weight, by following components group
Into：
Pulverized limestone：10%~30%
Flyash：20%~50%
Steel-making slag powder：30%~50%；
Potassium dihydrogen phosphate：0.5%~2%；
Waterglass：1%~6%.
Pulverized limestone in above-mentioned curing agent is made in the following manner：By technical grade lime in baking oven with 100~150 DEG C
Temperature drying, to mass conservation, the levigate mesh sieve of mistake 200 after cooling, it is in 140~160 DEG C of electric furnace to be then placed in temperature
After calcining 0.5~1 hour, pulverized limestone is obtained.
Flyash powder in above-mentioned curing agent is made in the following manner：By national standard two level above flyash mistake
Sieve, take component of the particle diameter less than 2mm to be placed in baking oven, be passed through the airflow drying that temperature is 100~150 DEG C, make its aqueous
Rate is reduced to less than 2%, and 200 mesh sieves are crossed after cooling, after being calcined 1~2 hour by 500~700 DEG C of electric furnaces, obtains fine coal
Grey powder.
The activated steel slag powder of above-mentioned curing agent, which is prepared by the following method, to be formed：First by technical grade sodium metasilicate powder and work
Industry sodium hydroxide powder is 1.2~1.5 to be configured to water glass solution and stir according to modulus, moisture content is 30%~
50%；Slag is ground and crosses 200 mesh sieves, obtains steel-making slag powder.Then by steel-making slag powder and water glass solution according to solid-to-liquid ratio 5:1
~10:1 ratio is mixed, and at 30~35 DEG C of temperature, concussion stirring stirring stands 36~72 hours in 12~24 hours
Afterwards, compound is placed in baking oven, is passed through the airflow drying that temperature is 100~250 DEG C, its moisture content is less than 2%, then
Ball milling simultaneously crosses 200 mesh sieves, and activated steel slag powder is made.
The steel-making slag powder of above-mentioned curing agent is prepared by following methods：Water quenching converter is carried out broken and crosses 2mm sieves, incited somebody to action
Steel-making slag powder after sieve is positioned in baking oven, by the airflow drying that temperature is 100~150 DEG C, its moisture content is less than 2%, so
Grind afterwards and cross 200 mesh sieves, then after 500~700 DEG C of electric furnaces are calcined 1~2 hour, obtain steel-making slag powder.
The potassium dihydrogen phosphate of above-mentioned curing agent, which is prepared by the following method, to be formed：PHOSPHORIC ACID TECH.GRADE potassium dihydrogen is positioned over
In baking oven, by the airflow drying that temperature is 100~150 DEG C, its moisture content is less than 2%, grind and cross 0.075mm sieves,
Obtain potassium dihydrogen phosphate powder.
The preparation method of the above-mentioned curing agent for heavy metal pollution site remediation comprises the following steps：
1) pulverized limestone, fine coal ashes, activated steel slag powder and potassium dihydrogen phosphate are mixed, wherein the weight of each component
Measuring percentage is：Pulverized limestone：10%~30%, fine coal ashes：20%~50%, activated steel slag powder：30%~50%, phosphoric acid
Potassium dihydrogen powder：0.5%~2%.
2) use dry stirring 1~2 hour, make to cross 200 mesh sieves after being well mixed, obtain curing agent.
The application process of the above-mentioned curing agent for heavy metal pollution site remediation is：By curing agent and heavy metal polluted soil
Earth is mixed, and the dry weight ratio that curing agent volume accounts for contaminated soil is 5~15%, and contaminated soil is aqueous during stirring
Rate is controlled between 15~35%.
As preference, described heavy-metal contaminated soil is less than 0.075mm soil particles content and is more than 60%, wherein a huge sum of money
Category lead content is more than 2 500mg/kg, and heavy metal zinc content is more than 2 500mg/kg, and heavy metal cadmium content is more than 500 mg/kg.
There is excellent solidification effect come the curing agent for proving the present invention below by experiment.
Test to after reparation Compound Heavy Metals soil, i.e., using curing agent to Compound Heavy Metals place at
The toxicity leaching characteristic of the pollution soil body after reason, acid-base value are evaluated, wherein, the test of toxicity leaching characteristic passes through sulfuric acid nitre
Acid system is measured；PH value of water solution (the solid-to-liquid ratio 1 that the acid-base value of soil passes through solidified earth:1) evaluated.
Test material
1) Polluted Soil：It is derived from lead, zinc, the cadmium combined pollution soil in a certain industrial pollution place.Other main physicochemical properties are such as
Shown in table 1.
The Polluted Soil Main physical chemical property of table 1
2) steel-making slag powder：Slag is derived from the granulation converter water quenching slag after certain steel plant's magnetic separation, and ball is carried out after fetching laboratory
After mill, it is standby to cross 200 mesh sieves.Main chemical compositions are as shown in table 2.
The slag main component of table 2 and content
| Main chemical compositions | CaO | SiO2 | Al2O3 | Fe2O3 | MgO | P2O5 | Basicity |
| Content (%) | 36.30 | 16.26 | 3.32 | 18.66 | 8.35 | 1.26 | 2.07 |
3) other materials：
Pulverized limestone：Analyze pure.Flyash：Country-level flyash, cross 200 mesh sieves.Potassium dihydrogen phosphate：Analyze pure.Water glass
Glass powder：Analyze pure.Sodium metasilicate：Analyze pure.Sodium hydroxide：Analyze pure.
Using above-mentioned raw material, pulverized limestone, flyash, activation steel are prepared using the preparation method of the embodiment of the present invention respectively
Ground-slag, potassium dihydrogen phosphate and the corresponding curing agent of preparation.
As preference, described curing agent is composed of the following components according to mass percent：
Pulverized limestone：10%~30%
Fine coal ashes：20%~50%
Activated steel slag powder：30%~50%；
Potassium dihydrogen phosphate：0.5%~2%；
Embodiment 1
By the curing agent prepared respectively with test material 1) in Compound Heavy Metals soil sample mix, wherein solid
The volume of agent is 5% (accounting for composition metal Polluted Soil dry weight), and control prepares sample moisture content between 20 ± 2%, stirs
Use static pressure method sample preparation afterwards, be prepared into diameter 5cm, height 10cm columnar samples, sealing wrapped with freshness protection package, 20 DEG C, it is wet
Degree>Conserved 28 days under the conditions of 95%.
Embodiment 2
Identical with the sample making course and maintenance processes of embodiment 1, difference is that the volume of curing agent is 10% (curing agent
Account for heavy metal and organic compound contaminated native dry weight).
Embodiment 3
Identical with the sample making course and maintenance processes of embodiment 1, difference is that the volume of curing agent is 15% (curing agent
Account for heavy metal and organic compound contaminated native dry weight).
Comparative example 1
Do not add any curing agent, only take test material 1) in Compound Heavy Metals soil sample, i.e., using element soil, sampling
Static pressure method sample preparation, diameter 5cm is prepared into, height 10cm columnar samples, sealing is wrapped with freshness protection package, in 20 DEG C, humidity>95%
Under the conditions of conserve 28 days.
The specific experiment project being related in experiment is：
Test 1. toxicity characteristic leaching procedures
Testing standard：National environmental protection professional standard《Solid waste Leaching leaching method sulfonitric method》(HJ/
T 299-2007)。
Experiment process：Embodiment 1, embodiment 2, the preparation of each sample of embodiment 3 and comparative example 1 and maintenance processes phase
Together.Solidification Polluted Soil after maintenance, weigh wherein 60g samples and be placed in 105 DEG C of baking oven and dry, constant weight to weighing value twice
Error be less than ± 1%, sample moisture content is calculated.Calculated according to moisture content and repair solidify afterwards soil dry weight, weigh butt matter
Measure the solidification soil sample for 20g, and according to《Solid waste Leaching leaching method sulfonitric method》(HJ/T 299-2007) is advised
Fixed method and step is tested.Result of the test is as shown in table 3.
The toxicity characteristic leaching procedure result (mg/L) of table 3
| Heavy metal | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 |
| Pb | 0.130 | 0.030 | 0.012 | 2.753 |
| Zn | 0.250 | 0.028 | 0.013 | 164.756 |
| Cd | 0.009 | 0 | 0 | 14.219 |
Sulfonitric method leaching method is used to evaluate whether solid waste is the standard of hazardous waste, and analyzes solid
The common method of pollutant Leaching feature of the waste under acid precipitation effect.Can from the toxicity characteristic leaching procedure result of table 3
To find out：Mixed with the soil after the reparation of curing agent of the present invention, the leaching of lead (Pb), zinc (Zn) and cadmium (Cd) in its leachate
Concentration is as the volume of curing agent increases and reduces.By comparative example 1 it can be found that a huge sum of money in untreated Polluted Soil
Belong to migration and toxicity is extremely strong, the leaching content of heavy metal lead (Pb), zinc (Zn) and cadmium (Cd) is far above《Groundwater quality standard》
The boundary value of 4th class water quality standard in (GB/T 14848-9).Compared with comparative example 1, it can be seen that addition medicament can be notable
The leaching concentration of Heavy Metals in Contaminated Soils lead (Pb), zinc (Zn) and cadmium (Cd) is reduced, and with the increasing of curing agent yield
Add, Leaching of Heavy Metals concentration significantly reduces, and the especially higher cadmium (Cd) of activity can not just detect under 10% volume, greatly
The big environmental safety for improving heavy-metal contaminated soil.From embodiment 2 and 3 as can be seen that filling the curing agent in the present invention
And after conserving 28d, the stability of lead (Pb), zinc (Zn) and cadmium (Cd) is greatly improved, and its leaching content is far below《Underground
Standards of water quality》The boundary value of 4th class water quality standard in (GB/T 14848-9).
Experiment 2：Repair mud acid alkalinity test
Testing standard：ASTM Standard Test methods for pH of Soils D 4972-01.
Experiment process：Solidification Polluted Soil after maintenance, weigh wherein 50g samples and be placed at 105 DEG C and dry, constant weight to two
The error of secondary weighing value is less than ± 1%, and sample moisture content is calculated.Calculated according to moisture content and repair native dry weight, cross 2mm sieves
And the reparation soil sample that butt quality is 20g is weighed, it is stirred with 20g distilled water, takes supernatant to test pH value of solution after standing 1h
Value.Result of the test is as shown in table 4.
The acid-base value result of the test of table 4
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 |
| 10.15 | 10.68 | 10.87 | 5.86 |
The pH value of the solidification soil body is an important indicator for evaluating curing agent solidification and stabilization heavy metal effect, and it is repaired
The form of place second development and utilization has significant impact.By the acid-base value result of the test of table 4, by contrasting three embodiments
Experiment with a comparative example can obtain, and after adding curing agent, pollute that the pH value amplification of the soil body is obvious, the pollution soil body after reparation
PH averages between 10~11, meta-alkalescence.
The above described is only a preferred embodiment of the present invention, not the structure of the present invention is done any formal
Limitation.Any simple modification, equivalent change and modification that every technical spirit according to the present invention is made to above example,
In the range of still falling within technical scheme.
Claims (9)
- A kind of 1. curing agent for Compound Heavy Metals soil, it is characterised in that the curing agent according to mass percent, by with The following group packet into：Pulverized limestone：10%~30%Fine coal ashes：20%~50%Activated steel slag powder：30%~50%；Potassium dihydrogen phosphate：0.5%~2%.
- 2. according to the curing agent for being used for Compound Heavy Metals soil described in claim 1, it is characterised in that described pulverized limestone It is made in the following manner：Technical grade lime is dried in baking oven with 100~150 DEG C of temperature, to mass conservation, after cooling Levigate aperture of crossing is sieved less than 0.075mm, is then placed in after being calcined 0.5~1 hour in the electric furnace that temperature is 140~160 DEG C, is obtained Pulverized limestone.
- 3. according to the curing agent for being used for Compound Heavy Metals soil described in claim 1, it is characterised in that described flyash Powder is made in the following manner：National standard two level above flyash is sieved, takes component of the particle diameter less than 2mm to be placed on baking In case, the airflow drying that temperature is 100~150 DEG C is passed through, its moisture content is reduced to less than 2%, aperture is crossed after cooling and is less than 0.075mm is sieved, and after being calcined 1~2 hour by 500~700 DEG C of electric furnaces, obtains flyash powder.
- 4. according to the curing agent for being used for Compound Heavy Metals soil described in claim 1, it is characterised in that described di(2-ethylhexyl)phosphate Hydrogen potassium powder, which is prepared by the following method, to be formed：PHOSPHORIC ACID TECH.GRADE potassium dihydrogen is positioned in baking oven, is 100~150 by temperature DEG C airflow drying, make its moisture content be less than 2%, grind simultaneously cross aperture be less than 0.075mm sieve, obtain potassium dihydrogen phosphate powder.
- 5. according to the curing agent for being used for Compound Heavy Metals soil described in claim 1, it is characterised in that described activated steel slag Powder, which is prepared by the following method, to be formed：By steel-making slag powder and water glass solution according to solid-to-liquid ratio 5:1~10:1 ratio is mixed, At 30~35 DEG C of temperature, after concussion stirring stirring stands 36~72 hours in 12~24 hours, compound is placed in baking oven, led to It is 100~250 DEG C of airflow drying to enter temperature, its moisture content is less than 2%, then ball milling and crosses aperture and is less than 0.075mm sieves, Activated steel slag powder is made.
- 6. according to the curing agent for being used for Compound Heavy Metals soil described in claim 5, it is characterised in that described steel-making slag powder It is made by the following method：Water quenching converter slag is carried out broken and crosses 2mm sieves, is dried by the air-flow that temperature is 100~200 DEG C It is dry, its moisture content is less than 2%, then grind and cross 200 mesh sieves, then after 600~700 DEG C of electric furnaces are calcined 2~3 hours, Obtain steel-making slag powder.
- A kind of 7. preparation method of the curing agent as claimed in claim 1 for Compound Heavy Metals soil, it is characterised in that The preparation method comprises the following steps：Pulverized limestone, fine coal ashes, activated steel slag powder and potassium dihydrogen phosphate are mixed, its The percentage by weight of middle each component is：Pulverized limestone：10%~30%, fine coal ashes：20%~50%, activated steel slag powder：30% ~50%, potassium dihydrogen phosphate：0.5%~2%；Using dry stirring 1~2 hour, make it is well mixed after cross aperture and be less than 0.075mm is sieved, and obtains the curing agent.
- A kind of 8. application process of the curing agent as claimed in claim 1 for Compound Heavy Metals soil, it is characterised in that The application process is that the curing agent is carried out into original position with heavy metal polluted soil to mix and stir, and curing agent quality accounts for Polluted Soil dry ground quality 5%~10%, contaminated soil moisture control is between 15%~35%.
- 9. according to the application process of the curing agent for being used for Compound Heavy Metals soil described in claim 8, it is characterised in that institute The heavy metal polluted soil stated is less than 0.075mm soil particles content and is more than 65%, and wherein content of heavy metal lead is more than 2000mg/kg, Heavy metal zinc content is more than 2000mg/kg, and heavy metal cadmium content is more than 500mg/kg.
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| CN110128211A (en) * | 2019-06-14 | 2019-08-16 | 湖南省宝满科技开发有限公司 | A kind of organic phosphatic fertiliser |
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| CN111320444A (en) * | 2020-02-27 | 2020-06-23 | 东南大学 | Heat-insulation anti-cracking vertical barrier material aiming at composite pollutants and preparation method thereof |
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| EP4276084A1 (en) * | 2022-05-10 | 2023-11-15 | Ecocem Materials Limited | Hydraulic binder compositions comprising steel making slag, a co-binder and an alkali mineral salt |
| WO2023217811A1 (en) * | 2022-05-10 | 2023-11-16 | Ecocem Materials Limited | Hydraulic binder compositions comprising steel making slag, a co-binder and an alkali mineral salt |
| CN114804683A (en) * | 2022-06-07 | 2022-07-29 | 绍兴文理学院 | For Pb 2+ Novel APG curing agent for pollution treatment and preparation method thereof |
| CN115634917A (en) * | 2022-09-09 | 2023-01-24 | 江苏省环境科学研究院 | Method for restoring dye-contaminated soil |
| CN115634917B (en) * | 2022-09-09 | 2023-11-14 | 江苏省环境科学研究院 | Restoration method for dye-contaminated soil |
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