CN115353304A - Arsenic slag treatment method - Google Patents
Arsenic slag treatment method Download PDFInfo
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- CN115353304A CN115353304A CN202210987980.3A CN202210987980A CN115353304A CN 115353304 A CN115353304 A CN 115353304A CN 202210987980 A CN202210987980 A CN 202210987980A CN 115353304 A CN115353304 A CN 115353304A
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- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 145
- 239000002893 slag Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 24
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003513 alkali Substances 0.000 claims abstract description 19
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 19
- 239000010440 gypsum Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 59
- 239000000203 mixture Substances 0.000 claims description 40
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 24
- 239000012190 activator Substances 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000002386 leaching Methods 0.000 abstract description 15
- 229920000876 geopolymer Polymers 0.000 abstract description 10
- 229910001653 ettringite Inorganic materials 0.000 abstract description 8
- 229910000323 aluminium silicate Inorganic materials 0.000 abstract description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002585 base Substances 0.000 abstract description 5
- 230000004913 activation Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000001988 toxicity Effects 0.000 description 5
- 231100000419 toxicity Toxicity 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 229920005601 base polymer Polymers 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000001134 F-test Methods 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910003849 O-Si Inorganic materials 0.000 description 1
- 229910002656 O–Si–O Inorganic materials 0.000 description 1
- 229910003872 O—Si Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- MJLGNAGLHAQFHV-UHFFFAOYSA-N arsenopyrite Chemical compound [S-2].[Fe+3].[As-] MJLGNAGLHAQFHV-UHFFFAOYSA-N 0.000 description 1
- 229910052964 arsenopyrite Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 1
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 1
- 229940078583 calcium aluminosilicate Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002699 waste material 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/04—Obtaining arsenic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
-
- 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 treating arsenic slag, and belongs to the technical field of solid waste heavy metal pollution treatment. According to the method, arsenic slag is leached by hydrogen peroxide, and arsenic residues are obtained after arsenic is recovered through a leaching solution; and then fixing arsenic in the arsenic residue by adopting slag-red mud base geopolymer. The slag is rich in aluminosilicate and iron, the red mud contains aluminosilicate and has high alkalinity, potential alkali activation is provided, the desulfurized gypsum can promote the generation of ettringite in a system, and the desulfurized gypsum has some expansion in the reaction process, so that the structure is more compact, and the overall strength is improved; the slag-red mud base geopolymer is beneficial to forming a stable three-dimensional network structure and ettringite with arsenic, and the migration efficiency of the arsenic is reduced.
Description
Technical Field
The invention relates to a method for treating arsenic slag, and belongs to the technical field of solid waste heavy metal pollution treatment.
Background
Arsenic is called arsenic, the toxicity is very high, the arsenopyrite contains about 30 percent of arsenic and has a conceivably known harm, a large amount of accumulated arsenic is easy to permeate into underground water to pollute the environment and influence the water quality, so the reasonable treatment of arsenic slag is urgent.
As in the arsenic slag, the grade of the arsenic is high, and direct landfill not only wastes arsenic resources, but also has high danger. In the prior art, in the method for fixing arsenic by using tailing-red mud-based geopolymer, as element is embedded into aluminum-silicon bond to form se:Sub>A part of C-A-S-H (hydrated calcium aluminosilicate) geopolymer structure in the process of forming rich aluminosilicate three-dimensional network structure by using tailing-red mud-based geopolymer under the excitation of alkali activator, so that the three-dimensional network structure is firmer and has higher compressive strength and extremely low arsenic leaching rate. However, the scheme has poor arsenic fixing effect for a long time and has the risk of secondary arsenic leakage as a building material.
Disclosure of Invention
The invention provides a method for treating arsenic slag, aiming at the problems that the arsenic slag is not easy to comprehensively utilize and is easy to stack for a long time and leach and dissolve to cause great harm to human beings and the environment, namely hydrogen peroxide is adopted to leach the arsenic slag, the hydrogen peroxide has strong oxidizing property, low-valence arsenic is oxidized into high-valence arsenic and leached to obtain a leaching solution containing arsenic after the hydrogen peroxide is added, and arsenic is recovered through the leaching solution to obtain arsenic residue; and then fixing arsenic in the arsenic residue by adopting slag-red mud base geopolymer. The slag is rich in aluminosilicate and iron, the red mud contains aluminosilicate and has high alkalinity, potential alkali activation is provided, the desulfurized gypsum can promote the generation of ettringite in a system, and the desulfurized gypsum has some expansion in the reaction process, so that the structure is more compact, and the overall strength is improved; the slag-red mud base geopolymer is beneficial to forming a stable three-dimensional network structure and ettringite with arsenic, and the migration efficiency of the arsenic is reduced.
A method for treating arsenic slag comprises the following specific steps:
(1) Grinding, sieving and drying the arsenic slag, the furnace slag and the red mud respectively to obtain arsenic slag powder, furnace slag powder and red mud powder;
(2) Mixing the arsenic slag powder and hydrogen peroxide uniformly, carrying out extraction reaction for 2-5 h, separating an arsenic-containing solution and arsenic-containing residues, and drying the arsenic-containing solution to obtain arsenic white;
(3) Uniformly mixing the slag powder, the red mud powder and the desulfurized gypsum to obtain a slag-red mud mixture A;
(4) Dissolving sodium hydroxide into calcium hydroxide solution, and standing for 30-60 min to obtain an alkali activator;
(5) Adding the arsenic-containing residues into the slag-red mud mixture A, uniformly mixing to obtain a mixture B, adding an alkali activator, and uniformly mixing to obtain slurry C;
(6) Injecting the slurry C into a mold, sealing and standing for 24-36 h at room temperature, demolding, and curing for more than 7d at room temperature and under the humidity of 85-95% to obtain an arsenic-containing cured product;
the mass ratio of the arsenic slag powder to the hydrogen peroxide in the step (2) is 1; the extraction efficiency of the hydrogen peroxide on the arsenic in the arsenic slag powder can reach 60 to 80 percent;
the mass ratio of the slag powder, the red mud powder and the desulfurized gypsum in the step (3) is 3.5-6.5;
the modulus of the alkaline activator in the step (4) is 1.8-3.5;
in the step (5), the mass content of the arsenic residue in the mixture B is 5-10%, and the solid-liquid mass ratio of the slurry is 0.2-0.5.
The arsenic-containing cured samples were tested for compressive strength and arsenic concentration: the samples cured to the corresponding age were subjected to a compressive strength test, followed by a leaching test, and the arsenic concentration in the leachate was measured using an Inductively Coupled Plasma Optical emission spectrometer (ICP-OES).
The principle of fixing arsenic in arsenic residues by slag-red mud based geopolymer is as follows: the slag is rich in aluminosilicate and iron, the red mud contains aluminosilicate and has high alkalinity, potential alkali activation is provided, slag-red mud geopolymer contains se:Sub>A large amount of Cse:Sub>A, al, si and O elements, and se:Sub>A three-dimensional network structure similar to Si-O-Si, O-Si-O, al-O-Si and C-A-S-H is formed by an alkali activator excitant; the desulfurization gypsum promotes the generation of ettringite in a system in the process of forming the three-dimensional network structure, the desulfurization gypsum has certain expansion in the reaction process, the structure is more compact, the overall strength is improved, harmful arsenic elements in arsenic residues are stabilized in the three-dimensional network structure and the ettringite, and the leaching rate of arsenic is reduced.
The beneficial effects of the invention are:
(1) According to the invention, arsenic slag is leached by hydrogen peroxide, the hydrogen peroxide has strong oxidizing property, low-valence arsenic is oxidized into high-valence arsenic after the hydrogen peroxide is added, and arsenic-containing leaching solution is obtained by leaching, so that arsenic is recovered by arsenic white, and the arsenic content of slag-red mud base polymer is reduced when the slag-red mud base polymer is fixed;
(2) According to the invention, the effective arsenic fixation of the solid waste furnace slag and the red mud is utilized, so that in the process of forming a three-dimensional network structure by the slag-red mud base polymer under the excitation of an alkali activator, the desulfurized gypsum promotes the production of ettringite, harmful arsenic elements in the arsenic slag can be stabilized in the three-dimensional network structure and the ettringite to form a main body part of a geopolymer structure, the three-dimensional network structure is more stable, and the three-dimensional network structure has high compressive strength and extremely low arsenic leaching rate;
(3) The arsenic-containing condensate has excellent compressive strength which can reach 14.33MPa in 7 days and 24.80MPa in 28 days, has extremely low arsenic leaching rate, and can be used as a building paving material.
Drawings
FIG. 1 is a bar graph of compressive strength of samples after 7 days and 28 days of curing for examples 1-4;
FIG. 2 is a bar graph of arsenic fixing efficiency of the samples after 28 days of curing in examples 1-4.
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 slag, the red mud and the arsenic slag adopted in the embodiment are all taken from a place in Yunnan, and the composition of the components is shown in tables 1, 2 and 3;
TABLE 1 composition of slag Components (wt%)
TABLE 2 Red mud composition (wt%)
TABLE 3 arsenic slag composition (wt%)
A method for treating arsenic slag comprises the following specific steps:
(1) Respectively grinding the arsenic slag, the furnace slag and the red mud for 6 hours, sieving by a 180-mesh sieve, and drying at 60 ℃ for 12 hours to obtain arsenic slag powder, furnace slag powder and red mud powder;
(2) Mixing arsenic slag powder and commercially available hydrogen peroxide uniformly, carrying out extraction reaction for 2 hours, separating an arsenic-containing solution and arsenic-containing residues, and drying the arsenic-containing solution to obtain arsenic white; wherein the mass ratio of the arsenic slag powder to the hydrogen peroxide sold in the market is 1; the extraction efficiency of the hydrogen peroxide on the arsenic in the arsenic slag powder reaches 60 percent, and the arsenic content in the arsenic-containing residue is greatly reduced;
(3) Uniformly mixing the slag powder, the red mud powder and the desulfurized gypsum to obtain a slag-red mud mixture A; wherein the mass ratio of the slag powder, the red mud powder and the desulfurized gypsum is 3.5;
(4) Preparing a calcium hydroxide solution, adding sodium hydroxide into the calcium hydroxide solution, stirring for 2 hours to completely dissolve the sodium hydroxide, and standing for 30 minutes to obtain an alkaline activator, wherein the modulus of the alkaline activator is 1.8;
(5) Adding the arsenic-containing residues into the slag-red mud mixture A, uniformly mixing to obtain a mixture B, adding an alkali activator, and uniformly mixing to obtain slurry C; wherein the mass content of arsenic residues in the mixture B is 5 percent, and the solid-liquid mass ratio of the slurry is 0.5;
(6) Injecting the slurry C into a mold, sealing and standing for 24 hours at room temperature, demolding, and maintaining for 7-28 days at room temperature and at the humidity of 85% to obtain an arsenic-containing condensate A1;
performance testing the following methods were used to test the compressive strength: taking out the sample reaching the specified maintenance time, placing the sample on a compressive strength testing machine, taking the side surface of the test piece during molding as a pressure-bearing surface, placing the test piece on a lower pressing plate or a base plate of the testing machine, aligning the center of the test piece with the center of the lower pressing plate of the testing machine, starting the machine, reading out the compressive strength readings on a screen, and testing 3 average values of each group of samples;
and (3) calculating test results:
f＝F/A
compressive strength of f-cube test piece (MPa)
F-test specimen failure load (N)
A-test piece pressure bearing area (mm) 2 )
The compressive strength of the cubic sample is calculated to be accurate to 0.1MPa;
the Toxicity Leaching test was performed according to U.S. EPA Standard "Method 1311Toxicity charateristic Leaching Procedure" issued by the United states environmental protection agency;
the compressive strength of the arsenic-containing cured product of this example is shown in FIG. 1, and the compressive strength was 12.78MPa for 7 days, 20.04MPa for 28 days, and the arsenic fixation efficiency is 96.4% as shown in FIG. 2.
Example 2: the slag and the red mud adopted in the embodiment are both taken from some places in Yunnan, and the composition is shown in tables 4, 5 and 6;
TABLE 4 composition of slag Components (wt%)
TABLE 5 Red mud composition (wt%)
TABLE 6 arsenic slag composition (wt%)
A method for treating arsenic slag comprises the following specific steps:
(1) Grinding the arsenic slag, the furnace slag and the red mud for 6 hours respectively, sieving the ground materials by a 180-mesh sieve, and drying the ground materials at the temperature of 60 ℃ for 12 hours to obtain arsenic slag powder, furnace slag powder and red mud powder;
(2) Mixing arsenic slag powder and commercially available hydrogen peroxide uniformly, carrying out extraction reaction for 3 hours, separating an arsenic-containing solution and arsenic-containing residues, and drying the arsenic-containing solution to obtain arsenic white; wherein the mass ratio of the arsenic slag powder to the commercially available hydrogen peroxide is 1; the extraction efficiency of the hydrogen peroxide on arsenic in the arsenic slag powder reaches 69 percent;
(3) Uniformly mixing the slag powder, the red mud powder and the desulfurized gypsum to obtain a slag-red mud mixture A; wherein the mass ratio of the slag powder, the red mud powder and the desulfurized gypsum is 4.5;
(4) Preparing a calcium hydroxide solution, adding sodium hydroxide into the calcium hydroxide solution, stirring for 3 hours to completely dissolve the sodium hydroxide, and standing for 40 minutes to obtain an alkali activator, wherein the modulus of the alkali activator is 2.3;
(5) Adding the arsenic-containing residues into the slag-red mud mixture A, uniformly mixing to obtain a mixture B, adding an alkali activator, and uniformly mixing to obtain slurry C; wherein the mass content of arsenic residues in the mixture B is 7%, and the solid-liquid mass ratio of the slurry is 0.4;
(6) Injecting the slurry C into a mold, sealing and standing for 24 hours at room temperature, demolding, and maintaining for 7-28 days at room temperature and humidity of 90% to obtain an arsenic-containing condensate A2;
the performance test and toxicity leaching test methods were the same as in example 1;
the compressive strength of the arsenic-containing cured product of this example is shown in FIG. 1, and the compressive strength for 7 days is 14.33MPa, the compressive strength for 28 days is 19.28MPa, and the arsenic fixation efficiency is 97.64% as shown in FIG. 2.
Example 3: the slag and red mud adopted in the embodiment are both taken from some places in Yunnan, and the composition is shown in tables 7, 8 and 9;
TABLE 7 composition of slag Components (wt%)
TABLE 8 Red mud composition (wt%)
TABLE 9 arsenic slag composition (wt%)
A method for treating arsenic slag comprises the following specific steps:
(1) Grinding the arsenic slag, the furnace slag and the red mud for 6 hours respectively, sieving the ground materials by a 180-mesh sieve, and drying the ground materials at the temperature of 60 ℃ for 12 hours to obtain arsenic slag powder, furnace slag powder and red mud powder;
(2) Mixing arsenic slag powder and commercially available hydrogen peroxide uniformly, carrying out extraction reaction for 4 hours, separating an arsenic-containing solution and arsenic-containing residues, and drying the arsenic-containing solution to obtain arsenic white; wherein the mass ratio of the arsenic slag powder to the commercially available hydrogen peroxide is 1; the extraction efficiency of hydrogen peroxide on arsenic in the arsenic slag powder reaches 73 percent;
(3) Uniformly mixing the slag powder, the red mud powder and the desulfurized gypsum to obtain a slag-red mud mixture A; wherein the mass ratio of the slag powder, the red mud powder and the desulfurized gypsum is 5.5;
(4) Preparing a calcium hydroxide solution, adding sodium hydroxide into the calcium hydroxide solution, stirring for 4 hours to completely dissolve the sodium hydroxide, and standing for 50 minutes to obtain an alkali activator, wherein the modulus of the alkali activator is 2.8;
(5) Adding the arsenic-containing residues into the slag-red mud mixture A, uniformly mixing to obtain a mixture B, adding an alkali activator, and uniformly mixing to obtain slurry C; wherein the mass content of the arsenic residue in the mixture B is 9 percent, and the solid-liquid mass ratio of the slurry is 0.3;
(6) Injecting the slurry C into a mold, sealing and standing for 32 hours at room temperature, demolding, and curing for 7-28 days at room temperature and humidity of 90% to obtain an arsenic-containing cured product A3;
the performance test and toxicity leaching test methods were the same as in example 1;
the compressive strength of the arsenic-containing cured product of this example is shown in FIG. 1, and the compressive strength was 12.77MPa in 7 days and 24.80MPa in 28 days; the arsenic fixing efficiency is 99.69% as shown in fig. 2.
Example 4: the slag and red mud adopted in the embodiment are both taken from some places in Yunnan, and the composition is shown in tables 10, 11 and 12;
TABLE 10 composition of slag Components (wt%)
TABLE 11 composition of Red mud component (wt%)
TABLE 12 arsenic residue composition (wt%)
A method for treating arsenic slag comprises the following specific steps:
(1) Grinding the arsenic slag, the furnace slag and the red mud for 6 hours respectively, sieving the ground materials by a 180-mesh sieve, and drying the ground materials at the temperature of 60 ℃ for 12 hours to obtain arsenic slag powder, furnace slag powder and red mud powder;
(2) Mixing the arsenic slag powder and commercially available hydrogen peroxide uniformly, carrying out extraction reaction for 5 hours, separating an arsenic-containing solution and arsenic-containing residues, and drying the arsenic-containing solution to obtain arsenic white; wherein the mass ratio of the arsenic slag powder to the commercially available hydrogen peroxide is 1; the extraction efficiency of the hydrogen peroxide on the arsenic in the arsenic slag powder reaches 80 percent;
(3) Uniformly mixing the slag powder, the red mud powder and the desulfurized gypsum to obtain a slag-red mud mixture A; wherein the mass ratio of the slag powder, the red mud powder and the desulfurized gypsum is 6.5;
(4) Preparing a calcium hydroxide solution, adding sodium hydroxide into the calcium hydroxide solution, stirring for 5 hours to completely dissolve the sodium hydroxide, and standing for 60 minutes to obtain an alkaline activator, wherein the modulus of the alkaline activator is 3.5;
(5) Adding the arsenic-containing residues into the slag-red mud mixture A, uniformly mixing to obtain a mixture B, adding an alkali activator, and uniformly mixing to obtain slurry C; wherein the mass content of arsenic residues in the mixture B is 10%, and the solid-liquid mass ratio of the slurry is 0.2;
(6) Injecting the slurry C into a mold, sealing and standing for 36h at room temperature, demolding, and maintaining for 7-28 d at room temperature and under the humidity of 95% to obtain an arsenic-containing cured product A4;
the performance test and toxicity leaching test methods were the same as in example 1;
the compressive strength of the arsenic-containing cured product of this example is shown in FIG. 1, and the compressive strength was 9.96MPa in 7 days and 14.97MPa in 28 days; the arsenic fixing efficiency is 96.36% as shown in fig. 2.
While the present invention has been described in detail with reference to the specific embodiments thereof, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. The method for treating the arsenic slag is characterized by comprising the following steps: the method comprises the following specific steps:
(1) Grinding, sieving and drying the arsenic slag, the furnace slag and the red mud respectively to obtain arsenic slag powder, furnace slag powder and red mud powder;
(2) Mixing the arsenic slag powder and hydrogen peroxide uniformly, carrying out extraction reaction for 2-5 h, separating an arsenic-containing solution and arsenic-containing residues, and drying the arsenic-containing solution to obtain arsenic white;
(3) Uniformly mixing the slag powder, the red mud powder and the desulfurized gypsum to obtain a slag-red mud mixture A;
(4) Dissolving sodium hydroxide into calcium hydroxide solution, and standing for 30-60 min to obtain an alkali activator;
(5) Adding the arsenic-containing residues into the slag-red mud mixture A, uniformly mixing to obtain a mixture B, adding an alkali activator, and uniformly mixing to obtain slurry C;
(6) And injecting the slurry C into a mold, sealing and standing at room temperature for 24-36 h, demolding, and curing for more than 7d at room temperature and under the humidity of 85-95% to obtain the arsenic-containing cured product.
2. The method for treating arsenic slag as claimed in claim 1, wherein: the mass ratio of the arsenic slag powder to the hydrogen peroxide in the step (2) is 1-20.
3. The method for treating arsenic slag as claimed in claim 1, wherein: in the step (3), the mass ratio of the slag powder to the red mud powder to the desulfurized gypsum is 3.5-6.5.
4. The method for treating arsenic slag as claimed in claim 1, wherein: the modulus of the alkali activator in the step (4) is 1.8-3.5.
5. The method for treating arsenic slag as claimed in claim 1, wherein: in the step (5), the mass content of the arsenic residue in the mixture B is 5-10%, and the solid-liquid mass ratio of the slurry is 0.2-0.5.
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| CN114105590A (en) * | 2021-12-08 | 2022-03-01 | 昆明理工大学 | Method for fixing arsenic by utilizing tailing-red mud-based geopolymer |
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