CN111925016A - Method for treating high-arsenic waste acid by using honeycomb briquette slag - Google Patents
Method for treating high-arsenic waste acid by using honeycomb briquette slag Download PDFInfo
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- CN111925016A CN111925016A CN202010825871.2A CN202010825871A CN111925016A CN 111925016 A CN111925016 A CN 111925016A CN 202010825871 A CN202010825871 A CN 202010825871A CN 111925016 A CN111925016 A CN 111925016A
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- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 125
- 239000002893 slag Substances 0.000 title claims abstract description 58
- 239000004484 Briquette Substances 0.000 title claims abstract description 52
- 239000002253 acid Substances 0.000 title claims abstract description 41
- 239000002699 waste material Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 21
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000000843 powder Substances 0.000 claims abstract description 26
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000000706 filtrate Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000010355 oscillation Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- 239000011398 Portland cement Substances 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 239000002244 precipitate Substances 0.000 description 17
- 238000002386 leaching Methods 0.000 description 11
- 230000035484 reaction time Effects 0.000 description 10
- 231100000419 toxicity Toxicity 0.000 description 8
- 230000001988 toxicity Effects 0.000 description 8
- 238000009616 inductively coupled plasma Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- -1 arsenic ions Chemical class 0.000 description 6
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BMWMWYBEJWFCJI-UHFFFAOYSA-K iron(3+);trioxido(oxo)-$l^{5}-arsane Chemical compound [Fe+3].[O-][As]([O-])([O-])=O BMWMWYBEJWFCJI-UHFFFAOYSA-K 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 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
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 231100000820 toxicity test Toxicity 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 208000007443 Neurasthenia Diseases 0.000 description 1
- 206010036105 Polyneuropathy Diseases 0.000 description 1
- 208000000453 Skin Neoplasms Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229940000489 arsenate Drugs 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 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
- 230000007824 polyneuropathy Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 201000000849 skin cancer Diseases 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for treating high-arsenic waste acid by using honeycomb briquette slag, belonging to the technical field of heavy metal pollution treatment. Adding a hydrogen peroxide solution into high-arsenic waste acid, and reacting for 4-5 hours at the temperature of 80-82 ℃ under a stirring condition to obtain a solution A; adding the honeycomb briquette slag powder into the solution A, carrying out oscillation reaction for 4-12 h at the temperature of 25-30 ℃, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, drying the arsenic-containing solid, then stacking, and carrying out deep arsenic removal treatment on the filtrate. According to the invention, the honeycomb briquette slag powder is used for effectively replacing portland cement to remove arsenic in waste acid and generate a stable arsenic-containing compound, so that the diffusion and harm of arsenic in the environment are reduced, and secondary pollution is avoided.
Description
Technical Field
The invention relates to a method for treating high-arsenic waste acid by using honeycomb briquette slag, 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 stable production, but has high efficiency, but can generate secondary pollution. The most commonly used method for 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 treating high-arsenic waste acid by using honeycomb briquette slag, which effectively replaces portland cement with honeycomb briquette slag powder to remove arsenic in the waste acid and generate a stable arsenic-containing compound, thereby reducing the diffusion and harm of arsenic in the environment and avoiding secondary pollution.
A method for treating high-arsenic waste acid by using honeycomb briquette slag comprises the following specific steps:
(1) adding a hydrogen peroxide solution into high-arsenic waste acid, and reacting for 4-5 hours at the temperature of 80-82 ℃ under a stirring condition to obtain a solution A;
(2) adding honeycomb briquette slag powder into the solution A obtained in the step (1), adjusting the pH value of a system to be not higher than 5.0 by using a hydrogen peroxide solution, carrying out oscillation reaction for 4-12 h at the temperature of 25-30 ℃, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, drying the arsenic-containing solid, then stacking the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate.
The concentration of the hydrogen peroxide solution in the step (1) is 30%, the volume ratio of the hydrogen peroxide solution to the high-arsenic contaminated acid is 1: 4-6, and the concentration of arsenic in the high-arsenic contaminated acid is 3000.0-7000.0 mg/L.
The particle size of the honeycomb briquette slag powder in the step (2) is 200-300 meshes, and the solid-to-liquid ratio g: mL of the honeycomb briquette slag powder to the solution A is (12-24): 100.
The principle of treating high-arsenic waste acid by honeycomb briquette slag comprises the following steps: in the process of adding the oxidized waste acid into the honeycomb briquette slag powder, Ca and Si in the honeycomb briquette slag powder are subjected to arsenic precipitation reaction, and precipitates contain SiO2With CaSO4.2H2Oho with beeOther alkali metal elements in the honeycomb briquette slag powder form complex precipitates, so that the precipitates have compact structures and high crystallinity, arsenic ions are locked in the complex precipitates, the migration capacity and leaching toxicity of arsenic are reduced, and the effect of stabilizing harmful pollutants is achieved.
The invention has the beneficial effects that:
(1) according to the invention, the honeycomb briquette slag powder is used for effectively replacing portland cement to realize removal of arsenic in waste acid and generation of a stable arsenic-containing compound, so that the diffusion and harm of arsenic in the environment are reduced, secondary pollution is avoided, and the purpose of treating waste by waste is realized;
(2) the honeycomb briquette slag of the invention has high content of alkaline compounds and contains SiO2With CaSO4.2H2The precipitate of O and other alkali metal elements in the honeycomb briquette slag powder form a complex precipitate, so that the precipitate has a compact structure, arsenic ions are locked in the complex precipitate, and the stability of an arsenic-containing compound is enhanced.
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 waste acid is from a certain smelting plant in southwest of China, the waste water obtained by washing water in the acid making link by using flue gas is strong in acidity, metal elements, nonmetal elements and heavy metal elements in the flue gas in the washing process are accumulated continuously and enter the waste acid, the waste acid contains various metal elements such As Cu, Zn, Al and the like, the nonmetal elements such As Cl, F, S, C and the like, the heavy metal elements such As As, Pb, Cd and the like, arsenic is the heavy metal element with the highest content in the waste acid, the content of the elements in the waste acid is shown in table 1 through ICP element detection, the components of honeycomb briquette slag powder are shown in table 2, and the most content of the honeycomb briquette slag is SiO2And 16.09% Fe2O3And 14.96% CaO;
TABLE 1 contaminated acid composition (mg. L)-1)
TABLE 2 composition of Honeycomb briquet slag
A method for treating high-arsenic waste acid by using honeycomb briquette slag comprises the following specific steps:
(1) adding a hydrogen peroxide solution into high-arsenic contaminated acid, and reacting for 4 hours at the temperature of 80 ℃ and the stirring speed of 180r/min to obtain a solution A; wherein the concentration of the hydrogen peroxide solution is 30%, and the volume ratio of the hydrogen peroxide solution to the high-arsenic contaminated acid is 1: 4-6;
(2) adding honeycomb briquette slag powder into 50mL of the solution A obtained in the step (1), detecting the pH value of a system to be 3.47, oscillating the system in a constant-temperature oscillator at the temperature of 25 ℃ for 12h at an oscillation speed of 180r/min, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, carrying out deep arsenic removal treatment on the filtrate, diluting the filtrate, measuring the concentration of residual arsenic by using ICP (inductively coupled plasma), drying the arsenic-containing solid at the temperature of 60 ℃ for 12h, and carrying out SEM (scanning electron microscope) and EDS (electronic discharge spectroscopy) analysis; the particle size of the honeycomb briquette slag powder is 200-300 meshes, and the adding amount of the honeycomb briquette slag powder is 2g, 4g, 6g, 8g, 10g and 12g in sequence;
TABLE 3 arsenic content and arsenic removal rate of the remaining solution under different honeycomb briquette slag powder usage
As can be seen from Table 3, the arsenic content in the solution decreases with the increase of the amount of the added honeycomb briquette slag, the arsenic removal rate gradually increases, the rising trend of the arsenic removal rate gradually decreases with the increase of the amount of the added honeycomb briquette slag, particularly, the arsenic content of the residual solution and the arsenic removal rate do not change greatly when the amount of the added honeycomb briquette slag is between 10g and 12g, the arsenic content of the residual solution is 118.2mg/L when the amount of the added honeycomb briquette slag is 10g, the arsenic removal rate of the residual solution reaches 97.05% (the arsenic content of the raw solution is 4g/L), and the arsenic content of the residual solution is 109mg/L and the arsenic removal rate reaches 97.28% when the amount of the added honeycomb briquette slag is 12 g.
The dry arsenic-containing solid was subjected to a leaching toxicity test, the toxicity test results are shown in table 4,
TABLE 4 Leaching toxicity analysis
As can be seen from Table 4, the arsenic content of the leachate of the obtained precipitates is very high when the addition amount of the honeycomb briquette slag is 2g and 4g, and both can not meet the national stacking standard, but when the addition amount of the honeycomb briquette slag exceeds 6g, the arsenic content in the steel slag is high, only a small amount of arsenide is stably fixed in the steel slag to be leached into the solution again, the leaching toxicity of the obtained arsenic-containing solid is less than 5.0mg/L, and the arsenic-containing solid can be directly stacked.
Example 2: the high arsenic contaminated acid and the honeycomb briquette slag in the embodiment are the same as those in embodiment 1;
a method for treating high-arsenic waste acid by using honeycomb briquette slag comprises the following specific steps:
(1) adding a hydrogen peroxide solution into high-arsenic contaminated acid, and reacting for 4.5 hours at the temperature of 81 ℃ and the stirring speed of 180r/min to obtain a solution A; wherein the concentration of the hydrogen peroxide solution is 30 percent, and the volume ratio of the hydrogen peroxide solution to the high-arsenic contaminated acid is 1: 5;
(2) adding honeycomb briquette slag powder into 50mL of the solution A obtained in the step (1), detecting the pH value of a system to be 2.33, carrying out oscillation reaction in a constant-temperature oscillator at the temperature of 28 ℃ at an oscillation speed of 180r/min, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, carrying out deep arsenic removal treatment on the filtrate, diluting the filtrate, measuring the concentration of residual arsenic by using ICP (inductively coupled plasma), drying the arsenic-containing solid at the temperature of 60 ℃ for 12 hours, and carrying out SEM (scanning electron microscope) and EDS (electronic discharge spectroscopy) analysis; the particle size of the honeycomb briquette slag powder is 200-300 meshes, and the vibration reaction time is 1h, 2h, 4h, 6h, 9h and 12h in sequence;
TABLE 5 arsenic content and arsenic removal rate of the remaining solution at different reaction times
As can be seen from table 5, the arsenic content of the remaining solution gradually decreased with the increase of the reaction time, the arsenic removal rate gradually increased, and when the reaction time was less than 9 hours, the increase amplitude was large, the curve was shaken straight, and when the reaction time was greater than 9 hours, the curve increased more smoothly, because the honeycomb briquette slag mainly achieved the purpose of removing arsenic by adsorption in a short time, and as the time increased, the generation of ferric arsenate by chemical reaction was more stable, the removal rate curve was relatively gentle; when the reaction time is 12 hours, the arsenic content of the residual solution is 118.2mg/L, and the arsenic removal rate reaches 97.04%;
toxicity leaching experiments were carried out on arsenic-containing precipitates under different oscillation reaction time conditions, and the experimental results are shown in Table 6
TABLE 6 Leaching toxicity analysis
As can be seen from Table 6, when the reaction time is less than 2 hours, the arsenic-containing precipitates can not meet the national stacking standard, are all larger than 5.0mg/L, and can not be directly stacked in the environment, but when the reaction time exceeds 4 hours, the arsenic content in the precipitates is all lower than 5.0mg/L, and can be directly stacked in the environment; arsenic is attached to the surface of honeycomb briquette slag in a short time, although arsenic removal effect is achieved, arsenic-containing precipitate is unstable, the toxic leaching cannot reach the standard, more stable ferric arsenate is generated through chemical reaction along with the increase of reaction time, and the toxic leaching is gradually reduced.
Example 3: the high arsenic contaminated acid and the honeycomb briquette slag in the embodiment are the same as those in embodiment 1;
a method for treating high-arsenic waste acid by using honeycomb briquette slag comprises the following specific steps:
(1) adding a hydrogen peroxide solution into high-arsenic contaminated acid, and reacting for 5 hours at the temperature of 82 ℃ and the stirring speed of 180r/min to obtain a solution A; wherein the concentration of the hydrogen peroxide solution is 30 percent, and the volume ratio of the hydrogen peroxide solution to the high-arsenic contaminated acid is 1: 6;
(2) adding honeycomb briquette slag powder into 50mL of solution A obtained in the step (1), adjusting the pH value of a system to be 0.98, 3, 5, 7, 9 and 12 in sequence by adopting a hydrogen peroxide solution, carrying out oscillation reaction for 4 hours in a constant-temperature oscillator at the temperature of 30 ℃ at an oscillation speed of 180r/min, carrying out solid-liquid separation to obtain an arsenic-containing solid and a filtrate, carrying out deep arsenic removal treatment on the filtrate, measuring the residual arsenic concentration by using ICP (inductively coupled plasma) after the filtrate is diluted, drying the arsenic-containing solid at the temperature of 60 ℃ for 12 hours, and carrying out SEM (scanning electron microscope) and EDS (electronic discharge spectroscopy) analysis; wherein the particle size of the honeycomb briquette slag powder is 200-300 meshes;
TABLE 7 arsenic content and arsenic removal rate of residual solution under different initial pH values of oscillation reaction
As can be seen from Table 7, the arsenic content of the remaining solution containing arsenic in the remaining solution gradually decreased with increasing pH, the arsenic removal rate gradually increased, the fluctuation range of the arsenic removal rate with different initial pH was large, and when the initial pH was higher than 3, the hydrogen ion concentration in the solution was too low, and Fe2O3The reaction with the waste acid is less, and the dissolved part of iron ions can not react with arsenic ions under the condition that the pH value is higher than 3, the arsenic removal effect is best when the pH value is 12, the arsenic removal rate reaches 99.72%, and the arsenic content of the residual solution is 146.6 mg/L; but when the pH value is 0.98-5, the arsenic removal rate also reaches 92-95%;
toxicity leaching experiments were carried out on the filter residue under different initial pH values of the shaking reaction, and the experimental results are shown in Table 8
TABLE 8 Leaching toxicity analysis
As shown in Table 8, Fe was found to be present at a pH of 0.98 to 32O3Can be dissolved in the solution and reacts with arsenic ions in the solution to generate arsenate, and when the pH value is less than 5, the arsenic content of the obtained arsenic-containing slag is equal to or higher than that of the arsenic-containing slag<5.0mg/L, can be directly stacked,when the pH value is more than 5, the arsenic content in the slag does not meet the national stacking standard and can not be directly stacked in the environment, so the initial pH value of the oscillation reaction is less than 5; therefore, in the process of adding the oxidized waste acid into the honeycomb briquette slag powder, Ca and Si in the honeycomb briquette slag powder are subjected to arsenic precipitation reaction, and precipitates contain SiO2With CaSO4.2H2O and other alkali metal elements in the honeycomb briquette slag powder form a complex precipitate, so that the precipitate has a compact structure and high crystallinity, arsenic ions are locked in the complex precipitate, the arsenic migration capacity and leaching toxicity are reduced, and the effect of stabilizing harmful pollutants is achieved.
Claims (3)
1. A method for treating high-arsenic waste acid by using honeycomb briquette slag is characterized by comprising the following specific steps:
(1) adding a hydrogen peroxide solution into high-arsenic waste acid, and reacting for 4-5 hours at the temperature of 80-82 ℃ under a stirring condition to obtain a solution A;
(2) adding honeycomb briquette slag powder into the solution A obtained in the step (1), adjusting the pH value of a system to be not higher than 5.0 by using a hydrogen peroxide solution, carrying out oscillation reaction for 4-12 h at the temperature of 25-30 ℃, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, drying the arsenic-containing solid, then stacking the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate.
2. The method for treating high-arsenic waste acid by using honeycomb briquette slag as claimed in claim 1, which is characterized in that: the concentration of the hydrogen peroxide solution in the step (1) is 30%, the volume ratio of the hydrogen peroxide solution to the high-arsenic contaminated acid is 1: 4-6, and the concentration of arsenic in the high-arsenic contaminated acid is 3000.0-7000.0 mg/L.
3. The method for treating high-arsenic waste acid by using honeycomb briquette slag as claimed in claim 1, which is characterized in that: the particle size of the honeycomb briquette slag powder in the step (2) is 200-300 meshes, and the solid-to-liquid ratio g/mL of the honeycomb briquette slag powder to the solution A is (12-24): 100.
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Cited By (2)
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|---|---|---|---|---|
| CN113060791A (en) * | 2021-04-01 | 2021-07-02 | 昆明理工大学 | Method for treating high-arsenic waste acid by using modified coal slag adsorbent |
| CN113548755A (en) * | 2021-08-18 | 2021-10-26 | 昆明理工大学 | Method for purifying arsenic-containing wastewater |
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| CN113060791A (en) * | 2021-04-01 | 2021-07-02 | 昆明理工大学 | Method for treating high-arsenic waste acid by using modified coal slag adsorbent |
| CN113548755A (en) * | 2021-08-18 | 2021-10-26 | 昆明理工大学 | Method for purifying arsenic-containing wastewater |
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| CN111925016B (en) | 2023-04-18 |
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