CN110746168A - Method for solidifying arsenic-containing sludge by steel slag and silica fume cementing material - Google Patents
Method for solidifying arsenic-containing sludge by steel slag and silica fume cementing material Download PDFInfo
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- CN110746168A CN110746168A CN201910898369.1A CN201910898369A CN110746168A CN 110746168 A CN110746168 A CN 110746168A CN 201910898369 A CN201910898369 A CN 201910898369A CN 110746168 A CN110746168 A CN 110746168A
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- steel slag
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- 239000002893 slag Substances 0.000 title claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- 239000010802 sludge Substances 0.000 title claims abstract description 44
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910021487 silica fume Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 title claims abstract description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 239000000084 colloidal system Substances 0.000 claims abstract description 18
- 239000012190 activator Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 229910001868 water Inorganic materials 0.000 claims description 2
- 238000010494 dissociation reaction Methods 0.000 claims 1
- 230000005593 dissociations Effects 0.000 claims 1
- 238000002386 leaching Methods 0.000 abstract description 22
- 231100000419 toxicity Toxicity 0.000 abstract description 18
- 230000001988 toxicity Effects 0.000 abstract description 18
- 239000004568 cement Substances 0.000 abstract description 7
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000011112 process operation Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 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
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000010440 gypsum Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 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
- 238000000748 compression moulding Methods 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
- 239000002910 solid waste Substances 0.000 description 3
- 231100000820 toxicity test Toxicity 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000004710 electron pair approximation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000010891 toxic waste Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 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
- C04B28/02—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
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- 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
- C04B2111/00784—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes for disposal only
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material, belonging to the technical field of heavy metal pollution treatment. The invention uses NaSiO3Dissolving NaOH in deionized water, and cooling to room temperature to obtain an alkali activator; uniformly mixing the steel slag and the silica fume to obtain a mixture A, adding the mixture A into the sludge, and uniformly mixing to obtain a mixture B; adding the mixture B into an alkali activator, and stirring for reaction until a uniform colloid is formed; and pressing and molding the colloid, curing for 18-24 hours under the conditions that the temperature is 20-25 ℃ and the humidity is 80-90% to obtain a cured block, and naturally curing the cured block for more than 28 days. The invention utilizes the steel slag and the silica fume cementing material to replace cement to solidify the arsenic-containing sludge, and has simple process operation, low production cost and low leaching toxicity.
Description
Technical Field
The invention relates to a method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material, belonging to the technical field of heavy metal pollution treatment.
Background
Among the solid wastes, harmful solid wastes having a large influence on the environment are mainly used. Solidification/stabilization technology is one of the important methods for treating waste containing heavy metals. The cement-based solidification/stabilization technique has been widely used for the treatment of toxic wastes. However, the cement is expensive, has high leaching toxicity and is not suitable for industrial mass use.
Steel slag is a by-product of the steel-making process. It is composed of various oxides formed by oxidizing impurities in pig iron, such as silicon, manganese, phosphorus, sulfur, etc. in the smelting process, and salts generated by the reaction of these oxides and solvent, and belongs to solid waste.
Therefore, how to use the steel slag to solidify the arsenic-containing sludge is very beneficial to the treatment of heavy metal pollution.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for solidifying arsenic-containing sludge by using a steel slag and silicon ash cementing material, wherein the steel slag contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide; the silica fume can be used for filling the pores among cement particles, and simultaneously generates gel with a hydration product, and can react with an alkaline material to generate the gel, so that the steel slag and the silica fume are compounded to form arsenic-fixing gel to solidify arsenic-containing sludge, the process is simple to operate, the production cost is low, and the leaching toxicity is low.
A method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material comprises the following specific steps:
(1) mixing NaSiO3Dissolving NaOH in deionized water, and cooling to room temperature to obtain an alkali activator;
(2) uniformly mixing the steel slag and the silica fume to obtain a mixture A, adding the mixture A into the sludge, and uniformly mixing to obtain a mixture B;
(3) adding the mixture B in the step (2) into the alkali activator in the step (1), and stirring to react until a uniform colloid is formed;
(4) and (3) pressing and forming the colloid in the step (3), curing for 18-24 hours under the conditions that the temperature is 20-25 ℃ and the humidity is 80-90% to obtain a cured block, and naturally curing the cured block for more than 28 days.
The step (1) of NaSiO3The mass ratio of NaOH to NaSiO is (5-7): 33And the solid-to-liquid ratio g: mL of the total mass of NaOH to the deionized water is (2-4): 1.
The mass ratio of the steel slag, the silicon ash and the sludge in the step (2) is (3-5) to (1) (2-3), and the arsenic content of the sludge is 105-136 mg/L.
The mass ratio of the total mass of the steel slag and the silica fume in the step (2) to the mass of the alkali-activator in the step (1) is (8-9): 1.
The principle of solidifying the arsenic-containing sludge by using the steel slag and silica fume cementing material is as follows: the main component of the steel slag is Ca, the main component of the silica fume is Si, the two substances can generate hydration reaction under the alkaline condition to generate C-S-H gel, and the reaction formula is Ca (OH)2+ SiO2+H2O → C-S-H, the gel is directly wrapped on the surface of the sludge after being generated to form a stable gel protective layer, thereby preventing arsenic from seeping out of the sludge and achieving the purpose of protecting the environment.
The invention has the beneficial effects that:
the invention adopts the compounding of the steel slag and the silica fume to form the arsenic fixing gel to solidify the arsenic-containing sludge, and has simple process operation, low production cost and low leaching toxicity.
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 present example, the steel slag components are shown in table 1, the silica fume components are shown in table 2, the arsenic-containing sludge (gypsum slag) 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 components are shown in table 3;
a method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material comprises the following specific steps:
(1) mixing NaSiO3Dissolving NaOH in deionized water, and cooling to room temperature to obtainAn alkali activator; wherein NaSiO3The mass ratio of the sodium hydroxide to NaOH is 5:3, and NaSiO is3And the solid-to-liquid ratio g: mL of the total mass of NaOH to the deionized water is 2: 1;
(2) uniformly mixing the steel slag and the silica fume to obtain a mixture A, adding the mixture A into the sludge, and uniformly mixing to obtain a mixture B; wherein the mass ratio of the steel slag, the silica fume and the sludge is 3:1: 2;
(3) adding the mixture B in the step (2) into the alkali activator in the step (1), and stirring to react until a uniform colloid is formed; wherein the mass ratio of the total mass of the steel slag and the silica fume in the mixture B to the mass of the alkali-activator in the step (1) is 8: 1;
(4) putting the colloid in the step (3) into a mould, controlling the pressure to be 9 kN, performing compression molding to obtain a colloid block, curing the colloid block for 18 hours at the temperature of 25 ℃ and the humidity of 90% to obtain a cured block, and naturally curing the cured block for more than 28 days;
respectively testing the compressive strength and leaching toxicity of the cured blocks naturally cured in 3 rd, 7 th and 28 th days;
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 4,
TABLE 4 toxic leach results for arsenic-containing solids
As can be seen from Table 4, when the ratio of the amount of the steel slag, the silica fume and the arsenic-containing sludge is 3:1:2, the compressive strengths of the steel slag, the silica fume and the arsenic-containing sludge after natural curing for 3 days, 7 days and 28 days are respectively 25.87 MPa, 30.68 MPa and 49.62 MPa, and the compressive strengths are improved compared with the compressive strengths of normal cement curing; the leaching concentrations of the arsenic ions are 3.435 mg/L, 2.987 mg/L and 2.257 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 5 mg/L, which meets the national standard.
Example 2: in this example, the steel slag components are shown in Table 5, the silica fume components are shown in Table 6, the arsenic-containing sludge (gypsum slag) is obtained from a gypsum slag sludge obtained by removing arsenic from wastewater by lime neutralization precipitation in a sulfuric acid plant of a certain zinc smelting plant in the southwest region, and the main components are shown in Table 7;
a method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material comprises the following specific steps:
(1) mixing NaSiO3Dissolving NaOH in deionized water, and cooling to room temperature to obtain an alkali activator; wherein NaSiO3The mass ratio of the NaOH to the NaSiO is 2:13And the solid-to-liquid ratio g: mL of the total mass of NaOH to the deionized water is 4: 1;
(2) uniformly mixing the steel slag and the silica fume to obtain a mixture A, adding the mixture A into the sludge, and uniformly mixing to obtain a mixture B; wherein the mass ratio of the steel slag, the silicon ash and the sludge is 5:1: 3;
(3) adding the mixture B in the step (2) into the alkali activator in the step (1), and stirring to react until a uniform colloid is formed; wherein the mass ratio of the total mass of the steel slag and the silica fume in the mixture B to the mass of the alkali-activator in the step (1) is 9: 1;
(4) putting the colloid in the step (3) into a mould, controlling the pressure to be 11 kN, performing compression molding to obtain a colloid block, curing the colloid block for 24 hours at the temperature of 20 ℃ and the humidity of 80% to obtain a cured block, and naturally curing the cured block for more than 28 days;
respectively testing the compressive strength and leaching toxicity of the cured blocks naturally cured in 3 rd, 7 th and 28 th days;
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 8,
TABLE 8 compression Strength and toxicity Leaching results for arsenic-containing cured blocks
As can be seen from Table 8, when the steel slag, the silica fume and the arsenic-containing sludge are used in a g: g: g ratio of 5:1:3, the compressive strengths of the steel slag, the silica fume and the arsenic-containing sludge after natural curing for 3 days, 7 days and 28 days are respectively 32.75 MPa, 41.59 MPa and 56.28 MPa, and the compressive strengths are improved compared with the compressive strengths obtained by normal cement curing; the leaching concentrations of arsenic ions are respectively 2.091 mg/L, 2.548 mg/L and 1.960 mg/L, and it can be seen that the leaching toxicity of arsenic is continuously reduced along with the prolonging of time, and the leaching toxicity is less than 5 mg/L, which meets the national standard.
Example 3: in this example, the steel slag components are shown in Table 9, the silica fume components are shown in Table 10, the arsenic-containing sludge (gypsum slag) is obtained from a gypsum slag sludge obtained by removing arsenic from wastewater by lime neutralization precipitation in a sulfuric acid plant of a certain zinc smelting plant in the southwest region, and the main components are shown in Table 11;
a method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material comprises the following specific steps:
(1) mixing NaSiO3Dissolving NaOH in deionized water, and cooling to room temperature to obtain an alkali activator; wherein NaSiO3The mass ratio of the NaOH to the NaSiO is 7:33And the solid-to-liquid ratio g: mL of the total mass of NaOH to the deionized water is 3: 1;
(2) uniformly mixing the steel slag and the silica fume to obtain a mixture A, adding the mixture A into the sludge, and uniformly mixing to obtain a mixture B; wherein the mass ratio of the steel slag, the silicon ash and the sludge is 8:2: 5;
(3) adding the mixture B in the step (2) into the alkali activator in the step (1), and stirring to react until a uniform colloid is formed; wherein the mass ratio of the total mass of the steel slag and the silica fume in the mixture B to the mass of the alkali-activator in the step (1) is 8.5: 1;
(4) putting the colloid in the step (3) into a mould, controlling the pressure to be 10 kN, performing compression molding to obtain a colloid block, curing the colloid block for 21 hours under the conditions that the temperature is 22 ℃ and the humidity is 85% to obtain a cured block, and naturally curing the cured block for more than 28 days;
respectively testing the compressive strength and leaching toxicity of the cured blocks naturally cured in 3 rd, 7 th and 28 th days;
toxicity Leaching test of arsenic-containing solid was carried out according to U.S. EPA Method 1311-toxicityCharacteric Leaching Procedure provided by the U.S. environmental protection agency, and the results of the compressive strength and toxicity test are shown in Table 12,
TABLE 12 compression Strength and toxicity Leaching results for arsenic-containing cured masses
As can be seen from Table 12, when the steel slag, silica fume and arsenic-containing sludge were used in a g: g: g ratio of 8:4:5, the compressive strengths of the steel slag, silica fume and arsenic-containing sludge after natural curing for 3 days, 7 days and 28 days were 35.76 MPa, 43.88 MPa and 58.42 MPa, respectively, and the compressive strengths were improved as compared with the normal cement curing; the leaching concentrations of arsenic ions are respectively 3.004 mg/L, 2.458 mg/L and 1.578 mg/L, and it can be seen that the leaching toxicity of arsenic is continuously reduced along with the prolonging of time, and the leaching toxicity is less than 5 mg/L, which meets the national standard.
Claims (4)
1. A method for solidifying arsenic-containing sludge by using a steel slag and silica fume cementing material is characterized by comprising the following specific steps:
(1) mixing NaSiO3Dissolving NaOH in deionized water, and cooling to room temperature to obtain an alkali activator;
(2) uniformly mixing the steel slag and the silica fume to obtain a mixture A, adding the mixture A into the sludge, and uniformly mixing to obtain a mixture B;
(3) adding the mixture B in the step (2) into the alkali activator in the step (1), and stirring to react until a uniform colloid is formed;
(4) and (3) pressing and forming the colloid in the step (3), curing for 18-24 hours under the conditions that the temperature is 20-25 ℃ and the humidity is 80-90% to obtain a cured block, and naturally curing the cured block for more than 28 days.
2. The method for solidifying arsenic-containing sludge by using the steel slag and silicon ash cementing material according to claim 1, which is characterized by comprising the following steps of: step (1) NaSiO3The mass ratio of NaOH to NaSiO is (5-7): 33And total mass and dissociation of NaOHThe solid-liquid ratio g: mL of the child water is (2-4) to 1.
3. The method for solidifying arsenic-containing sludge by using the steel slag and silicon ash cementing material according to claim 1, which is characterized by comprising the following steps of: the mass ratio of the steel slag, the silicon ash and the sludge in the step (2) is (3-5) to (1-3), and the arsenic content of the sludge is 105-136 mg/L.
4. The method for solidifying arsenic-containing sludge by using the steel slag and silicon ash cementing material according to claim 1, which is characterized by comprising the following steps of: the mass ratio of the total mass of the steel slag and the silica fume in the step (2) to the mass of the alkali-activator in the step (1) is (8-9): 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925016A (en) * | 2020-08-17 | 2020-11-13 | 昆明理工大学 | Method for treating high-arsenic waste acid by using honeycomb briquette slag |
| CN113185202A (en) * | 2021-05-27 | 2021-07-30 | 昆明冶金研究院有限公司 | Method for solidifying arsenic by using steel slag-metakaolin-based multi-element solid waste geopolymer |
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| CN103508719A (en) * | 2013-07-30 | 2014-01-15 | 广西启利新材料科技股份有限公司 | Base geological polymer binder |
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