CN115069747A - Treatment process of arsenic-containing waste salt - Google Patents
Treatment process of arsenic-containing waste salt Download PDFInfo
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- CN115069747A CN115069747A CN202210638888.6A CN202210638888A CN115069747A CN 115069747 A CN115069747 A CN 115069747A CN 202210638888 A CN202210638888 A CN 202210638888A CN 115069747 A CN115069747 A CN 115069747A
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- 239000002699 waste material Substances 0.000 title claims abstract description 92
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 74
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 61
- 150000003839 salts Chemical class 0.000 title claims abstract description 39
- 239000000706 filtrate Substances 0.000 claims abstract description 42
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000002386 leaching Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000001723 curing Methods 0.000 claims abstract description 8
- 239000003792 electrolyte Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 239000002893 slag Substances 0.000 claims description 18
- 238000005868 electrolysis reaction Methods 0.000 claims description 17
- 239000011790 ferrous sulphate Substances 0.000 claims description 10
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 abstract description 15
- 238000001556 precipitation Methods 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000004571 lime Substances 0.000 description 8
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 8
- 229910052683 pyrite Inorganic materials 0.000 description 8
- 239000011028 pyrite Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000005273 aeration Methods 0.000 description 3
- -1 arsenic ions Chemical class 0.000 description 3
- 238000003487 electrochemical reaction Methods 0.000 description 3
- 239000008267 milk Substances 0.000 description 3
- 210000004080 milk Anatomy 0.000 description 3
- 235000013336 milk Nutrition 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229940000489 arsenate Drugs 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- RMBBSOLAGVEUSI-UHFFFAOYSA-H Calcium arsenate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][As]([O-])([O-])=O.[O-][As]([O-])([O-])=O RMBBSOLAGVEUSI-UHFFFAOYSA-H 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- OWTFKEBRIAXSMO-UHFFFAOYSA-N arsenite(3-) Chemical group [O-][As]([O-])[O-] OWTFKEBRIAXSMO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229940103357 calcium arsenate Drugs 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical class O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a treatment process of arsenic-containing waste salt, which comprises the following specific steps: (1) leaching and dissolving the arsenic-containing waste salt, stirring to obtain arsenic-containing waste liquid, and filtering to obtain waste residue 1 and filtrate 1; (2) adjusting the pH value of the filtrate, electrolyzing to obtain electrolyte, and filtering the electrolyte to obtain waste residue 2 and filtrate 2; (3) adding a stabilizer into the filtrate 2, stirring and filtering to obtain waste residues 3 and filtrate 3, and directly discharging the filtrate 3; (4) and mixing the waste residue 1, the waste residue 2 and the waste residue 3, adding a curing agent to prepare a cured body, and then burying. The method carries out multiple fractional precipitation and filtration on the solution formed by the arsenic-containing waste salt, ensures that the finally obtained wastewater reaches the standard and is discharged, and the solidified body meets the landfill standard of general industrial solid waste; the method provided by the invention has the advantages of low cost of raw materials, good treatment effect and safe and efficient whole process, the concentration of arsenic in the waste salt can be effectively reduced, and the treated waste salt has stable property.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a treatment process of arsenic-containing waste salt.
Background
As common accompanying elements of nonferrous metal ores and pyrite, arsenic is sublimated into flue gas in a sulfuric acid production and calcination working section, and then the arsenic enters into waste water in a wet purification process. In recent years, with the development of metallurgy and chemical industry, a considerable part of arsenic enters the environment in the form of arsenic-containing waste water, tailings and waste residues. Thereby resulting in regional, watershed, or even larger scale arsenic contamination incidents.
Sulfuric acid is used as an important chemical product, is widely applied to various industrial departments, and has huge consumption. The main raw materials adopted in the production of sulfuric acid comprise pyrite, sulfur, gypsum, smelting flue gas and the like, and the pyrite is widely used in China to prepare the sulfuric acid. Although our country adjusts the raw material structure of sulfuric acid production to some extent in recent years, the pyrite-based sulfuric acid production still occupies a large proportion in a short period. Waste gas, waste water and waste residue generated in the process of preparing sulfuric acid from pyrite are sources of arsenic pollution.
The acidic wastewater generated by the pyrite acid making is high in acidity and water quantity and contains various harmful substances, wherein the high arsenic content is the main pollution characteristic of the wastewater. At present, the commonly used tail end chemical treatment methods for the acid wastewater from pyrite acid production by domestic production enterprises include a lime neutralization method, a lime-iron salt method, a three-stage countercurrent lime method, an oxidation method ferrite method, a vulcanization method, a membrane separation method and the like; foreign countries generally adopt methods such as ferric oxide salt-lime method multistage treatment, ion exchange and the like. In actual production, enterprises select a relatively economic lime treatment method, but the treatment method increases the production of arsenic-containing waste salt due to the use of a large amount of lime, so that secondary pollution accidents are easily caused.
Therefore, the technical personnel in the field need to solve the problem of providing a low-cost, good-treatment-effect, safe and efficient treatment process of arsenic-containing waste salt.
Disclosure of Invention
In view of the above, the invention provides a treatment process of arsenic-containing waste salt, which is characterized in that the solution formed by the arsenic-containing waste salt (slag) is subjected to multiple fractional precipitation and filtration, the finally obtained wastewater is ensured to reach the standard and be discharged, and a solidified body meets the landfill standard of general industrial solid waste; the method provided by the invention can effectively reduce the arsenic concentration in the waste salt (slag), and the treated waste salt (slag) has stable property.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment process of arsenic-containing waste salt comprises the following specific steps:
(1) leaching and dissolving the arsenic-containing waste salt, stirring to obtain arsenic-containing waste liquid, and filtering to obtain waste residue 1 and filtrate 1;
(2) adjusting the pH value of the filtrate, electrolyzing to obtain electrolyte, and filtering the electrolyte to obtain waste residue 2 and filtrate 2;
(3) adding a stabilizer into the filtrate 2, stirring and filtering to obtain waste residues 3 and filtrate 3, and directly discharging the filtrate 3;
(4) and mixing the waste residue 1, the waste residue 2 and the waste residue 3, adding a curing agent to prepare a cured body, and then burying.
The method carries out multiple fractional precipitation and filtration on the solution formed by the arsenic-containing waste salt (slag), ensures that the finally obtained waste water reaches the standard and is discharged, and the solidified body meets the landfill standard of general industrial solid waste; the solidified body meets the landfill standard of general industrial solid waste; the method provided by the invention can effectively reduce the arsenic concentration in the waste salt (slag), and the treated waste salt (slag) has stable property.
Preferably, the leaching in the step (1) is carried out according to the ratio of the mass volume of the arsenic-containing waste salt to the mass volume of water of 100g:500-1000 mL.
Preferably, the stirring time in step (1) is 30-60min, and the rotation speed is 300 rpm.
Preferably, the pH value of the filtrate in the step (2) is adjusted to 7-9, and a regulator of Ca (OH) is adopted 2 And (3) solution.
The invention uses Ca (OH) 2 The solution is used as pH regulator for regulating pH value of the solution and Ca 2+ And the arsenic ions and arsenite ions form precipitates, so that the arsenic concentration can be effectively reduced.
Preferably, the electrode for electrolysis in step (2) is an iron-carbon electrode.
The invention uses iron-carbon electrode to micro-electrolyze arsenic-containing filtrate, on one hand, Fe can be generated in the micro-electrolysis process 2+ And Fe 3+ After reductionAdding the ferrous sulfate, on the other hand, introducing oxidizing gas under alkaline condition to generate H in the iron-carbon micro-electrolysis process 2 O 2 And oxidizing trivalent arsenic and organic arsenic into pentavalent arsenic with low toxicity.
Preferably, the electrode material for iron-carbon micro-electrolysis is cast iron and carbon dust, and the mass ratio of the cast iron to the carbon dust is 1-3: 1.
The iron-carbon micro-electrolysis method does not need external voltage, takes low-potential iron as an anode and high-potential carbon as a cathode under the condition of no power supply, and the micro-electrolysis material can generate potential difference after being externally connected with a lead to carry out electrolysis treatment on the wastewater.
Preferably, the conditions of the electrolysis in step (2) are: introducing oxygen, electrolyzing for 60-120min, wherein the introduction amount of the oxygen is 100-150L/h.
Preferably, the stirring time in step (1) is 60-120min, and the rotation speed is 300 rpm.
Preferably, the stabilizer in step (3) is ferrous sulfate.
The invention takes ferrous sulfate as a stabilizing agent, Fe 2+ And Fe formed after oxidation thereof 3+ Can form precipitate with arsenate ion, and can generate colloid Fe (OH) under alkaline condition 2 And Fe (OH) 3 The flocculant can adsorb suspended matters in wastewater to achieve the effect of removing pollutants.
Preferably, the mass of the ferrous sulfate is 5-25% of the mass of the waste liquid.
Preferably, in the step (4), the curing agent is a mixture of portland cement, fly ash and slag, and the mass ratio of portland cement to fly ash to slag is 1:2-3: 1.
Preferably, the addition amount of the curing agent is 20-50% of the mass of the waste residue after mixing.
The existing arsenic-containing waste residue treatment methods comprise an incineration method, a wet leaching method and a solidification method. The incineration method has high treatment cost, and the incineration process may cause volatilization of arsenic, so that higher secondary pollution control cost is required. The wet leaching method has low cost and no secondary pollution, but has complex process flow, high requirement on operators and high cost, and is difficult to put into practical production and application. The curing method has simple process flow, low equipment and operation cost, and good strength, heat resistance and durability of the cured body, and is widely applied in industry. Therefore, the invention adopts a solidification method to treat the waste residue.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a treatment process of arsenic-containing waste salt, which is characterized in that a solution formed by arsenic-containing waste salt (slag) is subjected to multiple fractional precipitation filtration, so that finally obtained wastewater is ensured to reach the standard and be discharged, and a solidified body meets the landfill standard of general industrial solid waste; the method provided by the invention can effectively reduce the arsenic concentration in the waste salt (slag), and the treated waste salt (slag) has stable property.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of the treatment process of arsenic-containing waste salt according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in figure 1, the treatment process of arsenic-containing waste salt comprises the following specific steps:
(1) weighing 2kg of arsenic-containing waste salt (the arsenic content is about 20%) generated in a certain sulfuric acid manufacturing plant, leaching and dissolving the arsenic-containing waste salt by using 10L of water, stirring the solution for 30min, and introducing the solution into a 50-mesh filter to obtain insoluble waste residue 1 and filtrate 1;
(2) by using Ca (OH) 2 Adjusting the pH value of the filtrate 1 to 7, preparing an iron-carbon electrode from cast iron and carbon dust according to the mass ratio of 1:1, then performing micro-electrolysis for 60min, introducing oxygen at the aeration rate of 100L/h in the micro-electrolysis process, and introducing into a 50-mesh filter again to obtain waste residue 2 and filtrate 2;
(3) adding 0.6kg of ferrous sulfate into the filtrate 2, stirring for 60min, and filtering to obtain waste residue 3 and filtrate 3, wherein the filtrate 3 is directly discharged, and the arsenic concentration in the filtrate 3 is 0.15 mg/L;
(4) and uniformly mixing the waste residue 1, the waste residue 2 and the waste residue 3 generated after the three times of filtration, and uniformly mixing the mixture with 400g of portland cement, 800g of fly ash and 400g of slag to prepare a solidified body, and then safely burying the solidified body, wherein the leaching concentration of the solidified body is 0.36 mg/L.
Example 2
A treatment process of arsenic-containing waste salt comprises the following specific steps:
(1) weighing 2.5kg of arsenic-containing waste salt (arsenic content is about 25.6%, pH is 5.4) generated in a certain sulfuric acid manufacturing plant, leaching and dissolving the arsenic-containing waste salt with 12L of water, stirring for 30min, and introducing into a 50-mesh filter to obtain insoluble waste residue 1 and filtrate 1;
(2) by using Ca (OH) 2 Adjusting the pH value of the filtrate 1 to 8, performing micro-electrolysis by using an iron-carbon electrode for 90min, introducing oxygen at an aeration rate of 110L/h in the micro-electrolysis process, and introducing into a 50-mesh filter again to obtain waste residues 2 and filtrate 2;
(3) adding 2kg of ferrous sulfate into the filtrate 2, stirring for 90min, and filtering to obtain waste residue 3 and filtrate 3, wherein the filtrate 3 is directly discharged, and the arsenic concentration in the filtrate 3 is 0.12 mg/L;
(4) and uniformly mixing the waste residue 1, the waste residue 2 and the waste residue 3 generated after the three times of filtration, and uniformly mixing the mixture with 550g of portland cement, 1100g of fly ash and 550g of slag to prepare a solidified body, and then safely burying the solidified body, wherein the leaching concentration of the solidified body is 0.31 mg/L.
Example 3
A treatment process of arsenic-containing waste salt comprises the following specific steps:
(1) weighing 3.2kg of arsenic-containing waste salt (the arsenic content is about 34.5%) of a certain pyrite acid-making factory, leaching and dissolving the arsenic-containing waste salt by using 32L of water, stirring the solution for 120min, and introducing the solution into a 50-mesh filter to obtain insoluble waste residue 1 and filtrate 1;
(2) by using Ca (OH) 2 Adjusting the pH value of the filtrate 1 to 9, preparing an iron-carbon electrode from cast iron and carbon dust according to the mass ratio of 3:1, then performing micro-electrolysis for 120min, introducing oxygen at the aeration rate of 150L/h in the micro-electrolysis process, and introducing into a 50-mesh filter again to obtain waste residue 2 and filtrate 2;
(3) adding 8.8kg of ferrous sulfate into the filtrate 2, stirring for 120min, and filtering to obtain waste residue 3 and filtrate 3, wherein the filtrate 3 is directly discharged, and the arsenic concentration in the filtrate 3 is 0.18 mg/L;
(4) and uniformly mixing the waste residue 1, the waste residue 2 and the waste residue 3 generated after the three times of filtration, and uniformly mixing the mixture with 600g of portland cement, 1800g of fly ash and 600g of slag to prepare a solidified body, and then safely burying the solidified body, wherein the leaching concentration of the solidified body is 0.42 mg/L.
Comparative example 1
CN108570562A discloses an electrochemical treatment method of arsenic-containing smelting waste slag, which comprises the following steps:
(1) mixing alkali and a solvent or an alkali solution with arsenic-containing smelting waste to obtain a mixture;
(2) placing the mixture as an electrolyte in an electrochemical reaction device for electrochemical reaction, wherein oxidizing gas is introduced into the electrolyte in the electrochemical reaction process;
(3) and (3) carrying out solid-liquid separation on the reaction product obtained in the step (2) to obtain an arsenic-containing solution.
The method has the advantages of high arsenic extraction rate, cleanness, no pollution, mild process conditions, low cost and low requirement on equipment, but the external power supply can increase the power consumption, and the finally obtained wastewater still contains arsenic.
The iron-carbon micro-electrolysis method adopted by the invention does not need external voltage, saves energy consumption, and simultaneously can dissolve the iron anode to generate the flocculating agent to play a role in flocculating adsorption.
Comparative example 2
CN108706763A discloses a method for treating arsenic-containing waste, which comprises the following steps:
(1) adjusting the pH value: adding sodium hydroxide and hydrogen chloride into the arsenic-containing waste solution, and adjusting the pH value to 6-8;
(2) primary precipitation: adding ferric trichloride into the arsenic-containing waste solution after the pH value is adjusted, so that the ratio of Fe in the arsenic-containing waste: as is 5-7: 1, stirring for 30min, standing for 60min, and separating water and slag;
(3) secondary precipitation: adding lime milk into the separated water solution, stirring for 10min, introducing oxygen, oxidizing for 20-25 min at an oxygen supply rate of 0.5-0.6L/min, and separating water and slag;
(4) filtering and detecting the arsenic content: and (4) filtering the solution in the step (3) through activated carbon, and detecting the arsenic content, wherein the arsenic content can be discharged when being less than 5%.
The method can effectively remove heavy metals in the wastewater, the removal rate of heavy metal arsenic is up to 97%, the environmental protection requirement is met, and the arsenic-containing sludge separated from the wastewater is pollution-free. However, ferric trichloride and lime milk are used as precipitants, chloride ions are corrosive to equipment, calcium arsenate formed by the lime milk and arsenate ions is poor in stability, and the risk of secondary pollution is caused.
The invention takes ferrous sulfate as a precipitator and Ca (OH) 2 Mainly used for adjusting the pH value and only plays an auxiliary role in precipitating arsenate.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A treatment process of arsenic-containing waste salt is characterized by comprising the following specific steps:
(1) leaching and dissolving the arsenic-containing waste salt, stirring to obtain arsenic-containing waste liquid, and filtering to obtain waste residue 1 and filtrate 1;
(2) adjusting the pH value of the filtrate, electrolyzing to obtain electrolyte, and filtering the electrolyte to obtain waste residue 2 and filtrate 2;
(3) adding a stabilizer into the filtrate 2, stirring and filtering to obtain waste residues 3 and filtrate 3, and directly discharging the filtrate 3;
(4) and mixing the waste residue 1, the waste residue 2 and the waste residue 3, adding a curing agent to prepare a cured body, and then burying.
2. The process as claimed in claim 1, wherein the leaching in step (1) is performed according to the ratio of the arsenic-containing waste salt to water with a mass volume of 100g:500-1000mL, and the filtration mesh is 50 meshes.
3. The process according to claim 1, wherein the pH value of the filtrate in the step (2) is adjusted to 7-9 by using Ca (OH) as an adjusting agent 2 And (3) solution.
4. The process according to claim 1, wherein the electrode for electrolysis in step (2) is an iron-carbon electrode.
5. The process according to claim 1, wherein the electrolysis conditions in step (2) are as follows: introducing oxygen, electrolyzing for 60-120min, wherein the introduction amount of the oxygen is 100-150L/h.
6. The process according to claim 1, wherein the stabilizing agent in step (3) is ferrous sulfate.
7. The process of claim 6, wherein the mass of the ferrous sulfate is 5-25% of the mass of the arsenic-containing waste liquid.
8. The treatment process of waste salt containing arsenic according to claim 1, wherein the curing agent in the step (4) is a mixture of portland cement, fly ash and slag in a mass ratio of 1:2-3: 1.
9. The treatment process of waste salt containing arsenic as claimed in claim 1, wherein the addition amount of the curing agent is 20-50% of the mass of the waste residue after mixing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210638888.6A CN115069747A (en) | 2022-06-07 | 2022-06-07 | Treatment process of arsenic-containing waste salt |
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