CN110963751A - Method for stabilizing arsenic-containing sludge by kaolin geopolymer - Google Patents
Method for stabilizing arsenic-containing sludge by kaolin geopolymer Download PDFInfo
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- CN110963751A CN110963751A CN201911154010.XA CN201911154010A CN110963751A CN 110963751 A CN110963751 A CN 110963751A CN 201911154010 A CN201911154010 A CN 201911154010A CN 110963751 A CN110963751 A CN 110963751A
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- containing sludge
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 76
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 53
- 239000010802 sludge Substances 0.000 title claims abstract description 53
- 239000005995 Aluminium silicate Substances 0.000 title claims abstract description 40
- 235000012211 aluminium silicate Nutrition 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 239000012190 activator Substances 0.000 claims abstract description 16
- 239000003513 alkali Substances 0.000 claims abstract description 16
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 239000008367 deionised water Substances 0.000 claims abstract description 11
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 230000032683 aging Effects 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 238000007873 sieving Methods 0.000 claims abstract description 6
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 238000002386 leaching Methods 0.000 description 21
- 231100000419 toxicity Toxicity 0.000 description 16
- 230000001988 toxicity Effects 0.000 description 16
- 238000001723 curing Methods 0.000 description 14
- 239000004568 cement Substances 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- -1 arsenic ions Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 231100000820 toxicity test Toxicity 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004710 electron pair approximation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 208000007443 Neurasthenia Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 206010036105 Polyneuropathy Diseases 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
- 208000000453 Skin Neoplasms Diseases 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 210000004877 mucosa Anatomy 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000007824 polyneuropathy Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 201000000849 skin cancer Diseases 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
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
- 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
- C04B18/0418—Wet materials, e.g. slurries
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a method for stabilizing arsenic-containing sludge by kaolin geopolymer, belonging to the technical field of heavy metal pollution treatment. The method comprises the steps of calcining kaolin to obtain metakaolin, carrying out ball milling on the metakaolin, and sieving to obtain metakaolin powder; adding deionized water into metakaolin powder and uniformly mixing to obtain a mixture A; adding an alkali activator into the mixture A under the stirring condition, and uniformly mixing to obtain geopolymer slurry; uniformly mixing the geopolymer slurry with arsenic-containing sludge to obtain a mixture B; and aging the mixture B for 1-3 h at the temperature of 40-50 ℃, then pouring the mixture B into a mold for molding to obtain a molded block, and naturally curing the molded block for 7-28 d after demolding. The kaolin has good plasticity and pressure resistance, can greatly enhance the compression strength of the arsenic-containing solidified block, improves the stability of the arsenic-containing sludge, and has good market prospect.
Description
Technical Field
The invention relates to a method for stabilizing arsenic-containing sludge by kaolin geopolymer, belonging to the technical field of heavy metal pollution treatment.
Background
Arsenic can form high-toxicity compounds, can be absorbed by human bodies from respiratory tracts, skins and digestive tracts, can cause neurasthenia syndrome, polyneuropathy, skin mucosa pathological changes and the like, and inorganic compounds of arsenic can cause lung cancer and skin cancer. After arsenic-containing wastewater is treated, most harmful substances such as arsenic are transferred into sludge, so that the method has important practical significance for safe treatment and disposal research of the arsenic-containing sludge.
At present, various methods such as wet treatment, pyrogenic treatment, solidification treatment and the like are used for treating arsenic-containing sludge. The wet treatment has low energy consumption, low pollution and high efficiency, but the operation steps are complicated; the pyrogenic process has simple treatment process and high production stability and efficiency, but generates secondary pollution, so the most commonly used method for treating the arsenic-containing sludge is solidification. The portland cement method is often adopted in the curing method, but the method has higher cost and is not beneficial to large-scale use of enterprises.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for stabilizing arsenic-containing sludge by using kaolin geopolymer, which is used for solidifying the arsenic-containing sludge by using the kaolin geopolymer, greatly improves the compressive strength of a solidified body by using the plasticity and the compressive resistance of the kaolin geopolymer, has easily obtained raw materials, lower cost and simpler and more convenient operation process compared with cement. Kaolin is a natural mineral, the raw material is easy to obtain and low in price, and the geopolymer is an inorganic polymer and mainly takes inorganic nonmetallic minerals (kaolin, limestone and the like) as raw materials, so that the recycling and high added value utilization of various industrial solid wastes, such as rice husk ash, sludge and the like, can be realized by treating the sludge.
A method for stabilizing arsenic-containing sludge by kaolin geopolymer comprises the following specific steps:
(1) calcining kaolin to obtain metakaolin, ball-milling the metakaolin, and sieving to obtain metakaolin powder;
(2) adding deionized water into the metakaolin powder obtained in the step (1) and uniformly mixing to obtain a mixture A;
(3) adding an alkali activator into the mixture A obtained in the step (2) under the stirring condition, and uniformly mixing to obtain geopolymer slurry;
(4) uniformly stirring and mixing the geopolymer slurry obtained in the step (3) and arsenic-containing sludge to obtain a mixture B;
(5) and (3) aging the mixture B in the step (4) at the temperature of 40-50 ℃ for 1-3 h, then pouring the aged mixture B into a mold for molding to obtain a molded block, and naturally curing the molded block for 7-28 d after demolding.
The calcination temperature in the step (1) is 550-650 ℃, the calcination time is 6-8 h, and the particle size of the metakaolin powder is less than 0.45 mm.
Further, the ball milling rotation speed in the step (1) is 80-120 r/min, and the ball milling time is 40-80 min.
The mass ratio of the deionized water to the metakaolin powder in the step (2) is (0.3-0.4): 1.
The adding amount of the alkali activator in the step (3) is 18-22% of the mass of the metakaolin powder in the step (2), the alkali activator is water glass, and the modulus of the water glass is 1.2-1.6.
The mass ratio of the geopolymer slurry in the step (4) to the arsenic-containing sludge is (1-2): 1, and the arsenic content in the arsenic-containing sludge is 105-136 mg/L.
Further, the geopolymer slurry and the arsenic-containing sludge in the step (4) are placed in a cement slurry mixer to be mixed, and the mixing speed of the cement slurry mixer is 80-120 r/min.
The principle of stabilizing arsenic-containing sludge by kaolin geopolymer is as follows: the kaolin geopolymer contains main substances of Si and Al, and in the hydration process of the geopolymer, the kaolin geopolymer can be dehydrated and condensed to generate small-particle geopolymer precursors, then relatively large molecules are further generated, and finally the small-particle geopolymer precursors are connected into a net-shaped structure to form a compact structure to wrap arsenic-containing sludge, wherein the compact net-shaped amorphous structure is mainly silicon-aluminum gel [ Na ]6(AlSiO4)6·4H2O ]. The formation of Si-Al gel leads the geopolymer structure to be more compact and the strength to be improved, can reduce the migration capability and leaching toxicity of arsenic and plays a role in stabilizing harmful pollutants.
The invention has the beneficial effects that:
the method utilizes the kaolin geopolymer to stabilize the arsenic-containing sludge, the kaolin geopolymer can effectively replace expensive cement, and the kaolin resource is wide and easy to obtain. The kaolin has plasticity, caking property, compression resistance and binding capacity, can effectively improve the compression strength of a solidified block, enhances the stability of arsenic-containing sludge, and reduces the diffusion and harm of arsenic in the environment.
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: in the embodiment, the kaolin has the components shown in table 1, the arsenic-containing sludge is sludge obtained by removing arsenic in wastewater by a lime neutralization precipitation method in a sulfuric acid workshop of a certain zinc smelting plant in the southwest region, and the main components are shown in table 2;
TABLE 1 Kaolin composition
A method for stabilizing arsenic-containing sludge by kaolin geopolymer comprises the following specific steps:
(1) calcining kaolin at 650 ℃ for 6h to obtain metakaolin, ball-milling the metakaolin for 40min, and sieving to obtain metakaolin powder; wherein the ball milling rotating speed is 120 r/min, and the particle size of the metakaolin powder is less than 0.45 mm;
(2) adding deionized water into the metakaolin powder obtained in the step (1) and uniformly mixing to obtain a mixture A; wherein the mass ratio of the deionized water to the metakaolin powder is 0.4: 1;
(3) adding an alkali activator into the mixture A obtained in the step (2) under the stirring condition, and uniformly mixing to obtain geopolymer slurry; wherein the addition amount of the alkali activator is 18 percent of the mass of the metakaolin powder in the step (2), and the alkali activator is water glass NaSiO2The modulus of the water glass is 1.6;
(4) adding the geopolymer slurry obtained in the step (3) and arsenic-containing sludge into a cement paste mixer, and uniformly mixing to obtain a mixture B; wherein the mass ratio of the geopolymer slurry to the arsenic-containing sludge is 1:1, and the arsenic content in the arsenic-containing sludge is 105 mg/L; the stirring speed of the cement slurry stirrer is 120 r/min;
(5) aging the mixture B in the step (4) at 50 ℃ for 1h, then pouring the mixture B into a mold for molding to obtain a molded block, and naturally curing the molded block after demolding for 28 d;
respectively testing the compressive strength and leaching toxicity of the cured blocks in the natural curing stages 7, 14 and 28 d;
toxicity Leaching tests of arsenic-containing solids were performed according to U.S. epa Method 1311-toxicitycharateristic leach Procedure, provided by the united states environmental protection agency, with toxicity test results as shown in table 3,
TABLE 3 compression Strength and toxicity Leaching results for arsenic-containing cured blocks
As can be seen from Table 3, when the mass ratio of the geopolymer slurry to the arsenic-containing sludge is (1-2): 1, the compressive strengths of the geopolymer slurry after natural curing for 7 days, 14 days and 28 days are 40.17 MPa, 45.99 MPa and 70.23 MPa respectively, and compared with the compressive strength of 20 MPa in the literature, the kaolin geopolymer has a good curing effect on the arsenic-containing sludge; the leaching concentrations of the arsenic ions are 2.981 mg/L, 2.207mg/L and 1.543 mg/L respectively, and it can be seen that the leaching toxicity of the arsenic is continuously reduced along with the prolonging of the time, and the leaching toxicity is less than 5mg/L, which meets the national standard.
Example 2: in this example, kaolin has the components shown in table 4, arsenic-containing sludge is obtained from a sulfuric acid plant of a certain zinc smelting plant in the southwest region by removing arsenic from wastewater by lime neutralization precipitation, and the main components are shown in table 5;
TABLE 4 Kaolin composition
A method for stabilizing arsenic-containing sludge by kaolin geopolymer comprises the following specific steps:
(1) calcining kaolin at 550 ℃ for 8 hours to obtain metakaolin, performing ball milling on the metakaolin for 80min, and sieving to obtain metakaolin powder; wherein the ball milling speed is 80 r/min, and the particle size of the metakaolin powder is less than 0.45 mm;
(2) adding deionized water into the metakaolin powder obtained in the step (1) and uniformly mixing to obtain a mixture A; wherein the mass ratio of the deionized water to the metakaolin powder is 0.3: 1;
(3) adding an alkali activator into the mixture A obtained in the step (2) under the stirring condition, and uniformly mixing to obtain geopolymer slurry;wherein the addition amount of the alkali activator is 22 percent of the mass of the metakaolin powder in the step (2), and the alkali activator is water glass NaSiO2The modulus of the water glass is 1.2;
(4) adding the geopolymer slurry obtained in the step (3) and arsenic-containing sludge into a cement paste mixer, and uniformly mixing to obtain a mixture B; wherein the mass ratio of the geopolymer slurry to the arsenic-containing sludge is 2:1, and the arsenic content in the arsenic-containing sludge is 136 mg/L; the stirring speed of the cement slurry stirrer is 80 r/min;
(5) aging the mixture B in the step (4) at the temperature of 40 ℃ for 3h, then pouring the mixture B into a mold for molding to obtain a molded block, and naturally curing the molded block for 28d after demolding;
respectively testing the compressive strength and leaching toxicity of the cured blocks in the natural curing stages 7, 14 and 28 d;
toxicity Leaching test of arsenic-containing solidified blocks was carried out according to U.S. EPA Method 1311-toxicityCharactericitic Leaching Procedure provided by the U.S. environmental protection agency, and the results of the compressive strength and toxicity test are shown in Table 6,
TABLE 6 compression Strength and toxicity Leaching results for arsenic-containing cured masses
As can be seen from Table 6, when the mass ratio of the geopolymer slurry to the arsenic-containing sludge is (1-2): 1, the compressive strengths of the geopolymer slurry after natural curing for 7 days, 14 days and 28 days are respectively 40.11 MPa, 54.07 MPa and 71.66 MPa, and compared with 20 MPa in the literature, the kaolin geopolymer has a good curing effect on the arsenic-containing sludge; the leaching concentrations of the arsenic ions are 2.901 mg/L, 2.029mg/L and 1.227 mg/L respectively, and it can be seen that the leaching toxicity of the arsenic is continuously reduced along with the prolonging of the time, and the leaching toxicity is less than 5mg/L, which meets the national standard.
Example 3: the cement composition of the example is shown in table 7, the arsenic-containing sludge is obtained from a sulfuric acid plant of a certain zinc smelting plant in the southwest region by removing arsenic in wastewater by lime neutralization precipitation, and the main composition is shown in table 8;
TABLE 7 Kaolin composition
A method for stabilizing arsenic-containing sludge by kaolin geopolymer comprises the following specific steps:
(1) calcining kaolin at 600 ℃ for 7 hours to obtain metakaolin, performing ball milling on the metakaolin for 60min, and sieving to obtain metakaolin powder; wherein the ball milling speed is 100 r/min, and the particle size of the metakaolin powder is less than 0.45 mm;
(2) adding deionized water into the metakaolin powder obtained in the step (1) and uniformly mixing to obtain a mixture A; wherein the mass ratio of the deionized water to the metakaolin powder is 0.35: 1;
(3) adding an alkali activator into the mixture A obtained in the step (2) under the stirring condition, and uniformly mixing to obtain geopolymer slurry; wherein the addition amount of the alkali activator is 20 percent of the mass of the metakaolin powder in the step (2), and the alkali activator is water glass NaSiO2The modulus of the water glass is 1.4;
(4) adding the geopolymer slurry obtained in the step (3) and arsenic-containing sludge into a cement paste mixer, and uniformly mixing to obtain a mixture B; wherein the mass ratio of the geopolymer slurry to the arsenic-containing sludge is 1.5:1, and the arsenic content in the arsenic-containing sludge is 120.7 mg/L; the stirring speed of the cement slurry stirrer is 100 r/min;
(5) aging the mixture B in the step (4) at the temperature of 45 ℃ for 2h, then pouring the mixture B into a mold for molding to obtain a molded block, and naturally curing the molded block for 28d after demolding;
respectively testing the compressive strength and leaching toxicity of the cured blocks in the natural curing stages 7, 14 and 28 d;
toxicity Leaching test of arsenic-containing solidified blocks was carried out according to U.S. EPA Method 1311-toxicityCharactericitic Leaching Procedure provided by the U.S. environmental protection agency, and the results of the compressive strength and toxicity test are shown in Table 9,
TABLE 9 compression Strength and toxicity Leaching results for arsenic-containing cured masses
As can be seen from table 9, when the mass ratio of the geopolymer slurry to the arsenic-containing sludge is 1.5:1, the compressive strengths of the geopolymer slurry after natural curing for 7 days, 14 days and 28 days are 39.71 MPa, 48.32 MPa and 68.49 MPa, respectively, and compared with 20 MPa in the literature, the kaolin geopolymer has a good curing effect on the arsenic-containing sludge; the leaching concentrations of the arsenic ions are 2.931 mg/L, 2.767mg/L and 1.761 mg/L respectively, and it can be seen that the leaching toxicity of the arsenic is continuously reduced along with the prolonging of the time, and the leaching toxicity is less than 5mg/L, which meets the national standard.
Claims (5)
1. A method for stabilizing arsenic-containing sludge by kaolin geopolymer is characterized by comprising the following specific steps:
(1) calcining kaolin to obtain metakaolin, ball-milling the metakaolin, and sieving to obtain metakaolin powder;
(2) adding deionized water into the metakaolin powder obtained in the step (1) and uniformly mixing to obtain a mixture A;
(3) adding an alkali activator into the mixture A obtained in the step (2) under the stirring condition, and uniformly mixing to obtain geopolymer slurry;
(4) uniformly stirring and mixing the geopolymer slurry obtained in the step (3) and arsenic-containing sludge to obtain a mixture B;
(5) and (3) aging the mixture B in the step (4) at the temperature of 40-50 ℃ for 1-3 h, then pouring the aged mixture B into a mold for molding to obtain a molded block, and naturally curing the molded block for 7-28 d after demolding.
2. The method for stabilizing arsenic-containing sludge by kaolin geopolymer according to claim 1, wherein: the calcination temperature in the step (1) is 550-650 ℃, the calcination time is 6-8 h, and the particle size of the metakaolin powder is less than 0.45 mm.
3. The method for stabilizing arsenic-containing sludge by kaolin geopolymer according to claim 1, wherein: the mass ratio of the deionized water to the metakaolin powder in the step (2) is (0.3-0.4): 1.
4. The method for stabilizing arsenic-containing sludge by kaolin geopolymer according to claim 1, wherein: the adding amount of the alkali activator in the step (3) is 18-22% of the mass of the metakaolin powder in the step (2), the alkali activator is water glass, and the modulus of the water glass is 1.2-1.6.
5. The method for stabilizing arsenic-containing sludge by kaolin geopolymer according to claim 1, wherein: the mass ratio of the geopolymer slurry in the step (4) to the arsenic-containing sludge is (1-2): 1, and the arsenic content in the arsenic-containing sludge is 105-136 mg/L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573890A (en) * | 2020-12-01 | 2021-03-30 | 浙江工业大学 | Metakaolin compound and application thereof in preparation of pavement repair material |
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| CN113233856A (en) * | 2021-05-27 | 2021-08-10 | 昆明冶金研究院有限公司 | Method for solidifying arsenic by using low-cost multi-element solid waste cementing material for underground filling |
| CN113398919A (en) * | 2021-06-08 | 2021-09-17 | 安徽元琛环保科技股份有限公司 | Method for preparing coating type denitration catalyst from municipal sludge |
| CN113398919B (en) * | 2021-06-08 | 2023-01-06 | 安徽元琛环保科技股份有限公司 | Method for preparing coating type denitration catalyst from municipal sludge |
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