CN113387627A - Method for fixing lead by steel slag-metakaolin based polymer material - Google Patents
Method for fixing lead by steel slag-metakaolin based polymer material Download PDFInfo
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- CN113387627A CN113387627A CN202110842364.4A CN202110842364A CN113387627A CN 113387627 A CN113387627 A CN 113387627A CN 202110842364 A CN202110842364 A CN 202110842364A CN 113387627 A CN113387627 A CN 113387627A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002861 polymer material Substances 0.000 title description 16
- 239000002893 slag Substances 0.000 claims abstract description 35
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011812 mixed powder Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 21
- 229920000876 geopolymer Polymers 0.000 claims abstract description 20
- 239000012190 activator Substances 0.000 claims abstract description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 16
- 239000011268 mixed slurry Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 16
- 239000003513 alkali Substances 0.000 claims abstract description 13
- RLJMLMKIBZAXJO-UHFFFAOYSA-N lead nitrate Chemical compound [O-][N+](=O)O[Pb]O[N+]([O-])=O RLJMLMKIBZAXJO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000002386 leaching Methods 0.000 abstract description 14
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 7
- 239000002910 solid waste Substances 0.000 abstract description 6
- 230000001988 toxicity Effects 0.000 abstract description 5
- 231100000419 toxicity Toxicity 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005342 ion exchange Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 23
- 239000000203 mixture Substances 0.000 description 13
- 239000000047 product Substances 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229960000583 acetic acid Drugs 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000012362 glacial acetic acid Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002335 preservative effect Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- MFEVGQHCNVXMER-UHFFFAOYSA-L 1,3,2$l^{2}-dioxaplumbetan-4-one Chemical compound [Pb+2].[O-]C([O-])=O MFEVGQHCNVXMER-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910000003 Lead carbonate Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- -1 and in addition Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
- 229910021514 lead(II) hydroxide Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention relates to a method for fixing lead in a steel slag-metakaolin based geopolymer material, belonging to the technical field of heavy metal lead pollution treatment and solid waste comprehensive utilization. Adding sodium hydroxide into a sodium silicate solution, uniformly mixing, standing for 16-20 hours to obtain an alkali activator, uniformly mixing steel slag powder and metakaolin powder to obtain mixed powder, adding a lead nitrate solution into the mixed powder, uniformly stirring, adding the alkali activator solution, and uniformly stirring to obtain mixed slurry; and pouring the mixed slurry into a mold, sealing, standing at room temperature for 24-36 h, demolding, and maintaining at constant temperature and humidity for 6-8 days. The invention completely utilizes solid waste to treat lead pollution, synthesizes geopolymer material under the action of alkaline activator, achieves the lead fixation effect through physical adsorption and ion exchange, has extremely low lead leaching toxicity, and simultaneously has excellent compressive strength which can also be applied to the construction industry.
Description
Technical Field
The invention relates to a method for fixing lead in a steel slag-metakaolin based geopolymer material, belonging to the technical field of heavy metal lead pollution treatment and solid waste comprehensive utilization.
Background
At present, the fixation of heavy metals by utilizing solid wastes is a development trend, the fixation of heavy metals is mainly realized by replacing part of cement with fly ash, blast furnace slag and the like, but the production of the cement not only consumes energy, but also has high carbon emission and pollutions to the environment, in addition, the fixation effects on different heavy metals are different, and particularly, the fixation research on lead is relatively less. The steel slag is used as solid waste generated in the industrial production process, has huge yield, not only occupies a large amount of land, but also contains harmful substances such as heavy metal and the like, and can generate destructive harm to the surrounding ecological environment without treatment, thereby finally harming the life health of human beings. However, the steel slag has potential activity and can play a role through proper activation, thereby creating great economic benefit. Metakaolin, as a clay material, is obtained by calcining metakaolin, and has the advantages of large yield, wide distribution, low utilization rate and great development value.
Disclosure of Invention
The invention provides a method for fixing lead by using a steel slag-metakaolin based geopolymer material, aiming at the problems in the prior lead fixing technology.
A method for fixing lead by a steel slag-metakaolin based geopolymer material is characterized by comprising the following specific steps:
(1) respectively grinding and drying the steel slag and the metakaolin to obtain steel slag powder and metakaolin powder;
(2) dissolving sodium silicate in deionized water to obtain a sodium silicate solution, adding sodium hydroxide into the sodium silicate solution, uniformly mixing, and standing for 16-20 hours to obtain an alkali activator;
(3) uniformly mixing the steel slag powder and the metakaolin powder to obtain mixed powder, adding a lead nitrate solution into the mixed powder, uniformly stirring, adding an alkali activator solution, and uniformly stirring to obtain mixed slurry;
(4) pouring the mixed slurry into a mold, sealing, standing at room temperature for 24-36 h, demolding, and maintaining at constant temperature and humidity for 6-8 d;
the Baume degree of the alkaline activator in the step (2) is 45-50 DEG Be, and the modulus is 1.3-1.5;
the mass ratio of the deionized water in the step (2) to the mixed powder in the step (3) is 0.30-0.34: 1;
the mass fraction of the steel slag in the mixed powder in the step (3) is 40-60%, and the mass fraction of the lead nitrate in the mixed slurry is 10-15%;
the temperature of the constant-temperature and constant-humidity curing in the step (4) is 20-30 ℃, and the humidity is 85-95%.
The principle of the steel slag-metakaolin based geopolymer material for lead fixation is as follows: under the action of an alkali activator, units with low relative molecular mass are dissolved in the silicon-oxygen tetrahedral groups and the aluminum-oxygen tetrahedral groups in the steel slag and the metakaolin under the action of an alkaline catalyst, and the small molecular units are polymerized again to form a three-dimensional network structure which is relatively stable and high in strength, and in addition, the C-S-H gel generated in the hydration process can improve the compactness of the geopolymer and further improve the compressive strength; lead ions can enter a three-dimensional network structure of a geopolymer or exchange ions with internal cations, and the lead ions serve as a cationic heavy metal to replace sodium ions or calcium ions to play a role in balancing charges; the hydration product C-S-H gel can adsorb lead ions or lead ions to perform ion exchange with calcium ions in the C-S-H gel, and the lead ions can react with SiO aiming at different cation heavy metals3 2-And OH-The chemical reaction is carried out to generate lead silicate and lead hydroxide precipitates, and in addition, carbon dioxide in the air is absorbed to generate lead carbonate precipitates, so that the high lead fixation efficiency is realized.
The invention has the beneficial effects that:
(1) the industrial solid waste steel slag and the clay material metakaolin are used as raw materials, the preparation process is simple, the cost is extremely low, the problem of solid waste treatment is solved, and the problem of lead pollution can be effectively solved;
(2) the product of the steel slag-metakaolin based polymer material for fixing arsenic has extremely low lead leaching toxicity and higher compressive strength, and provides a reliable material for the building industry;
(3) the steel slag-metakaolin based geopolymer material has high lead fixation efficiency, far meets the international leaching standard, and has little pollution in the whole production process.
Drawings
FIG. 1 is a bar graph of compressive strength of the steel slag-metakaolin based geopolymer material solid lead product of example 1 after 7 days of curing;
FIG. 2 is a bar graph of lead fixation efficiency of the steel slag-metakaolin based geopolymer material of example 1 after 7 days of curing;
FIG. 3 is a scanning electron microscope image of a steel slag-metakaolin based geopolymer material of example 1 after 7 days of curing.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.
Example 1: the steel slag adopted in the embodiment is obtained from a certain steel plant in Henan, and the composition is shown in Table 1; the metakaolin is from somewhere in Zheng of Henan, and the composition is shown in Table 2;
TABLE 1 composition of steel slag components (wt%)
TABLE 2 composition of metakaolin ingredients (wt%)
The preparation method of the steel slag-metakaolin based geopolymer material comprises the following specific steps:
(1) respectively grinding the steel slag and the metakaolin to about 200 meshes, and drying for 6 hours at the temperature of 105 ℃ to obtain steel slag powder and metakaolin powder;
(2) dissolving sodium silicate in deionized water, stirring for 5min to obtain sodium silicate solution, adding sodium hydroxide into the sodium silicate solution, mixing uniformly, stirring for 10min, and standing at room temperature for 18h to obtain an alkali activator; wherein the baume degree of the alkaline activator solution is 50 DEG Be, and the modulus is 1.4;
(3) uniformly mixing the steel slag powder and the metakaolin powder to obtain mixed powder, adding a lead nitrate solution into the mixed powder, uniformly stirring, slowly adding an alkali activator solution, and uniformly stirring to obtain mixed slurry; wherein the mass fraction of the steel slag in the mixed powder is 40 percent, and the mass fraction of the lead nitrate in the mixed slurry is 10 percent; the mass ratio of the deionized water to the mixed powder in the step (2) is 0.32: 1;
(4) pouring the mixed slurry into a mould, vibrating for 2min to fully remove bubbles in the slurry, sealing by using a preservative film, standing at room temperature for 24h, demoulding, and maintaining at constant temperature and humidity for 7 d; wherein the temperature of constant temperature and humidity curing is 20 ℃, and the humidity is 90%;
and (3) performance testing:
the concrete process of the compressive strength test comprises the following steps of placing a steel slag-metakaolin based polymer material solid lead product which is maintained for 7 days under a compressive strength tester, keeping the test block stably placed all the time, obtaining a compressive strength index in the tester, and testing 3 samples in each group.
And (3) calculating test results:
R＝F/A
r-compressive Strength (MPa)
F-breaking load (N)
A-area under pressure of test block (mm)2)
The calculation result is accurate to 0.1MPa
② the Toxicity Leaching test is carried out according to U.S. EPA Standard of Method 1311 selectivity characteristics Leaching Procedure, the pH value of the Leaching solution is 2.88 by mixing 5.7mL glacial acetic acid and 1L water, and the ratio of the grinded sample and the Leaching solution is 1: mixing at a ratio of 20kg/L, overturning and shaking at 20 ℃ at 30 r/min for 18h, acidifying the leached supernatant to pH <2 by using nitric acid, and finally testing the concentration of lead ions.
In this example, a histogram of compressive strength of the steel slag-metakaolin based polymer material after 7 days of curing is shown in fig. 1, a histogram of compressive strength of the steel slag-metakaolin based polymer material after 7 days of curing is 48.3MPa, a histogram of lead curing efficiency of the steel slag-metakaolin based polymer material after 7 days of curing is shown in fig. 2, and the lead curing efficiency is 98.8%;
the scanning electron microscope image of the steel slag-metakaolin based polymer material lead-fixing product cured for 7 days in the embodiment is shown in fig. 3, and as can be seen from fig. 3, a white amorphous hydration product C-S-H gel can be obviously observed, so that the compressive strength and the lead-fixing efficiency can be improved.
Example 2: the steel slag adopted in the embodiment is obtained from a certain steel plant in Henan, and the composition is shown in Table 3; the metakaolin is from somewhere in Zheng of Henan, and the composition is shown in Table 4;
TABLE 3 composition of steel slag components (wt%)
TABLE 4 composition of metakaolin component (wt%)
The preparation method of the steel slag-metakaolin based geopolymer material comprises the following specific steps:
(1) respectively grinding the steel slag and the metakaolin to about 200 meshes, and drying for 6 hours at the temperature of 105 ℃ to obtain steel slag powder and metakaolin powder;
(2) dissolving sodium silicate in deionized water, stirring for 6min to obtain sodium silicate solution, adding sodium hydroxide into the sodium silicate solution, mixing uniformly, stirring for 12min, and standing at room temperature for 16h to obtain an alkali activator; wherein the baume degree of the alkaline activator solution is 45 DEG Be, and the modulus is 1.3;
(3) uniformly mixing the steel slag powder and the metakaolin powder to obtain mixed powder, adding a lead nitrate solution into the mixed powder, uniformly stirring, slowly adding an alkali activator solution, and uniformly stirring to obtain mixed slurry; wherein the mass fraction of the steel slag in the mixed powder is 50 percent, and the mass fraction of the lead nitrate in the mixed slurry is 12 percent; the mass ratio of the deionized water to the mixed powder in the step (2) is 0.30: 1;
(4) pouring the mixed slurry into a mould, vibrating for 2min to fully remove bubbles in the slurry, sealing by using a preservative film, standing at room temperature for 28h, demoulding, and maintaining at constant temperature and humidity for 7 d; wherein the temperature of constant temperature and humidity curing is 25 ℃, and the humidity is 85%;
and (3) performance testing:
the concrete process of the compressive strength test comprises the following steps of placing a steel slag-metakaolin based polymer material solid lead product which is maintained for 7 days under a compressive strength tester, keeping the test block stably placed all the time, obtaining a compressive strength index in the tester, and testing 3 samples in each group.
And (3) calculating test results:
R＝F/A
r-compressive Strength (MPa)
F-breaking load (N)
A-area under pressure of test block (mm)2)
The calculation result is accurate to 0.1MPa
② the Toxicity Leaching test is carried out according to U.S. EPA Standard of Method 1311 selectivity characteristics Leaching Procedure, the pH value of the Leaching solution is 2.88 by mixing 5.7mL glacial acetic acid and 1L water, and the ratio of the grinded sample and the Leaching solution is 1: mixing at a ratio of 20kg/L, overturning and shaking at 20 ℃ at 30 revolutions/minute for 18 hours, acidifying the leached supernatant to pH <2 by using nitric acid, and finally testing the concentration of lead ions;
in this example, a bar graph of the compressive strength of the steel slag-metakaolin based polymer material after being cured for 7 days is shown in fig. 1, the compressive strength of the steel slag-metakaolin based polymer material after being cured for 7 days is 61.8MPa, and a bar graph of the lead curing efficiency of the steel slag-metakaolin based polymer material after being cured for 7 days is shown in fig. 2, and the lead curing efficiency is 99.9%.
Example 3: the steel slag adopted in the embodiment is obtained from a certain steel plant in Henan, and the composition is shown in Table 5; the metakaolin is from somewhere in Zheng of Henan, and the composition is shown in Table 6;
TABLE 5 composition of steel slag components (wt%)
TABLE 6 composition of metakaolin component (wt%)
The preparation method of the steel slag-metakaolin based geopolymer material comprises the following specific steps:
(1) respectively grinding the steel slag and the metakaolin to about 200 meshes, and drying for 6 hours at the temperature of 105 ℃ to obtain steel slag powder and metakaolin powder;
(2) dissolving sodium silicate in deionized water, stirring for 8min to obtain sodium silicate solution, adding sodium hydroxide into the sodium silicate solution, mixing uniformly, stirring for 15min, and standing for 36h at room temperature to obtain an alkali activator; wherein the baume degree of the alkaline activator solution is 50 DEG Be, and the modulus is 1.5;
(3) uniformly mixing the steel slag powder and the metakaolin powder to obtain mixed powder, adding a lead nitrate solution into the mixed powder, uniformly stirring, slowly adding an alkali activator solution, and uniformly stirring to obtain mixed slurry; wherein the mass fraction of the steel slag in the mixed powder is 60 percent, and the mass fraction of the lead nitrate in the mixed slurry is 15 percent; the mass ratio of the deionized water to the mixed powder in the step (2) is 0.34: 1;
(4) pouring the mixed slurry into a mould, vibrating for 3min to fully remove bubbles in the slurry, sealing by using a preservative film, standing at room temperature for 36h, demoulding, and maintaining at constant temperature and humidity for 7 d; wherein the temperature of constant temperature and humidity curing is 30 ℃, and the humidity is 90%;
and (3) performance testing:
the concrete process of the compressive strength test comprises the following steps of placing a steel slag-metakaolin based polymer material solid lead product which is maintained for 7 days under a compressive strength tester, keeping the test block stably placed all the time, obtaining a compressive strength index in the tester, and testing 3 samples in each group.
And (3) calculating test results:
R＝F/A
r-compressive Strength (MPa)
F-breaking load (N)
A-area under pressure of test block (mm)2)
The calculation result is accurate to 0.1MPa
Secondly, the Toxicity Leaching test is carried out according to the standard of U.S. EPA (Method 1311 proximity charateristic leach product) issued by the United states environmental protection agency, firstly, 5.7mL of glacial acetic acid is mixed with 1L of water to prepare Leaching liquid, the pH value is 2.88, then, the ground sample and the Leaching liquid are mixed according to the proportion of 1:20kg/L, the mixture is overturned and vibrated for 18h at 20 ℃ at 30 r/min, then, the leached supernatant is acidified to the pH value of less than 2 by using nitric acid, and finally, the lead ion concentration is tested;
in this example, a bar graph of the compressive strength of the steel slag-metakaolin based polymer material after being cured for 7 days is shown in fig. 1, the compressive strength of the steel slag-metakaolin based polymer material after being cured for 7 days is 55.9MPa, a bar graph of the lead curing efficiency of the steel slag-metakaolin based polymer material after being cured for 7 days is shown in fig. 2, and the lead curing efficiency is 99.2%.
Therefore, when the steel slag is added in an amount of 50%, the maximum compressive strength of 61.8MPa in 7 days is 99.9% and the lead fixation efficiency is 99.9%, when the steel slag is added in an amount of 40%, the minimum compressive strength of 48.3MPa in 7 days is 98.8%, and when the steel slag is added in an amount of 60%, the compressive strength of 55.9MPa in 7 days is 99.2%.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (5)
1. A method for fixing lead by a steel slag-metakaolin based geopolymer material is characterized by comprising the following specific steps:
(1) respectively grinding and drying the steel slag and the metakaolin to obtain steel slag powder and metakaolin powder;
(2) dissolving sodium silicate in deionized water to obtain a sodium silicate solution, adding sodium hydroxide into the sodium silicate solution, uniformly mixing, and standing for 16-20 hours to obtain an alkali activator;
(3) uniformly mixing the steel slag powder and the metakaolin powder to obtain mixed powder, adding a lead nitrate solution into the mixed powder, uniformly stirring, adding an alkali activator solution, and uniformly stirring to obtain mixed slurry;
(4) and pouring the mixed slurry into a mold, sealing, standing at room temperature for 24-36 h, demolding, and maintaining at constant temperature and humidity for 6-8 d.
2. The method for solidifying lead in the steel slag-metakaolin based geopolymer material as claimed in claim 1, wherein: the baume degree of the alkaline activator in the step (2) is 45-50 DEG Be, and the modulus is 1.3-1.5.
3. The method for solidifying lead in the steel slag-metakaolin based geopolymer material as claimed in claim 1, wherein: the mass ratio of the deionized water in the step (2) to the mixed powder in the step (3) is 0.30-0.34: 1.
4. The method for solidifying lead in the steel slag-metakaolin based geopolymer material as claimed in claim 1, wherein: in the mixed powder in the step (3), the mass fraction of the steel slag is 40-60%, and the mass of the lead nitrate is 10-15%.
5. The method for solidifying lead in the steel slag-metakaolin based geopolymer material as claimed in claim 1, wherein: and (4) maintaining at the constant temperature and the constant humidity at the temperature of 20-30 ℃ and the humidity of 85-95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110842364.4A CN113387627A (en) | 2021-07-26 | 2021-07-26 | Method for fixing lead by steel slag-metakaolin based polymer material |
Applications Claiming Priority (1)
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| CN113831070A (en) * | 2021-10-21 | 2021-12-24 | 昆明理工大学 | Method for fixing arsenic by using blast furnace slag-metakaolin based geopolymer |
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| CN110041016A (en) * | 2019-04-15 | 2019-07-23 | 中国农业大学 | A kind of geo-polymer adsorbent material and preparation method thereof |
| CZ2019602A3 (en) * | 2019-09-23 | 2020-07-15 | Unipetrol výzkumně vzdělávací centrum, a.s. | Composite with high heat accumulation |
| CN111422943A (en) * | 2020-04-16 | 2020-07-17 | 昆明理工大学 | Heavy metal immobilization stabilization treatment method |
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| CN108503292A (en) * | 2018-05-18 | 2018-09-07 | 武汉工程大学 | The metakaolin base geological polymer and preparation method thereof of slag powder is discarded in a kind of addition |
| CN110041016A (en) * | 2019-04-15 | 2019-07-23 | 中国农业大学 | A kind of geo-polymer adsorbent material and preparation method thereof |
| CZ2019602A3 (en) * | 2019-09-23 | 2020-07-15 | Unipetrol výzkumně vzdělávací centrum, a.s. | Composite with high heat accumulation |
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| CN113831070A (en) * | 2021-10-21 | 2021-12-24 | 昆明理工大学 | Method for fixing arsenic by using blast furnace slag-metakaolin based geopolymer |
| CN113831070B (en) * | 2021-10-21 | 2023-01-24 | 昆明理工大学 | Method for fixing arsenic by using blast furnace slag-metakaolin based geopolymer |
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Application publication date: 20210914 |