CN114920381A - Method for removing heavy metal ions by ultrasonic-assisted vulcanization precipitation method - Google Patents
Method for removing heavy metal ions by ultrasonic-assisted vulcanization precipitation method Download PDFInfo
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- CN114920381A CN114920381A CN202111001952.1A CN202111001952A CN114920381A CN 114920381 A CN114920381 A CN 114920381A CN 202111001952 A CN202111001952 A CN 202111001952A CN 114920381 A CN114920381 A CN 114920381A
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000001556 precipitation Methods 0.000 title claims abstract description 29
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 25
- 238000004073 vulcanization Methods 0.000 title claims abstract description 16
- 150000002500 ions Chemical class 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000002351 wastewater Substances 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 239000002699 waste material Substances 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000002244 precipitate Substances 0.000 claims description 14
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 10
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 238000000527 sonication Methods 0.000 claims 3
- 238000001914 filtration Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 238000005272 metallurgy Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 44
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 14
- 238000000926 separation method Methods 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 6
- 230000006911 nucleation Effects 0.000 abstract description 6
- 238000010899 nucleation Methods 0.000 abstract description 6
- 239000002360 explosive Substances 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 239000010419 fine particle Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 28
- 229910000365 copper sulfate Inorganic materials 0.000 description 10
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 10
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 9
- 238000009210 therapy by ultrasound Methods 0.000 description 9
- 239000000843 powder Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000001000 micrograph Methods 0.000 description 5
- 238000000967 suction filtration Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052976 metal sulfide Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
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- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- 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
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- 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)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for removing heavy metal ions by an ultrasonic-assisted sulfide precipitation method, which introduces ultrasonic waves into the process of treating waste acid wastewater by a sulfide precipitation method. By adjusting ultrasonic parameters, the uniformity of the vulcanization reaction environment is effectively controlled, and the problem of overhigh local concentration in a reactor is avoided, so that the supersaturation degree of the solution is reduced and the solution is more uniformly distributed, the explosive homogeneous nucleation phenomenon of sulfide precipitation is inhibited, and a large amount of fine particles are prevented from being generated; in addition, the ultrasonic wave enables the precipitated particles to oscillate violently, mutual collision among the particles is aggravated, the particles are promoted to be gathered into larger particles, and favorable conditions are provided for subsequent solid-liquid separation. The method is simple and easy to implement, provides favorable chemical and physical environments for nucleation and growth of metal precipitation particles, and also provides reference for efficiently recovering valuable metal resources of the waste acid smelting wastewater by a sulfide precipitation method.
Description
Technical Field
The invention belongs to the field of heavy metal sewage treatment, and particularly relates to a method for removing heavy metal ions in wastewater by an ultrasonic-assisted vulcanization precipitation method.
Background
Industrial processes such as printing, electroplating, metal smelting and the like can generate a large amount of wastewater containing heavy metals, and if the wastewater is directly discharged into a water body environment, a series of negative effects can be caused on the environment and organisms. The problems of removing heavy metal ions in the waste acid water from nonferrous metal smelting and recovering valuable resources are always a key point and a difficult point in the industrial environment-friendly process.
In the process of treating heavy metal wastewater, the sulfide precipitation method has the advantages of wide pH range, high reaction rate, stable generated sulfide, high recycling value and the like, and is widely applied to the process of treating waste acid. However, due to the low solubility of sulfide, a large supersaturation degree is generated at the moment of contact between heavy metal ions and a sulfide precipitating agent, which results in an explosive homogeneous nucleation phenomenon, and a large amount of very fine particles are generated, which is not beneficial to subsequent further separation operation. In addition, the over-fast sulfurization reaction rate may result in uneven supersaturation distribution and uneven reaction rate in the reactor, and is also one of the limiting factors for the incapable of stable growth of the deposited grains. These are the root causes of the precipitation process, which results in a large amount of slag and a low recovery efficiency of valuable metals. Therefore, how to provide conditions suitable for nucleation and growth of the sulfide precipitation particles and how to improve the settling property of the precipitation substances by means of increasing the sulfide precipitation particles or changing the surface properties of the particles and the like so as to further improve the solid-liquid separation efficiency is the key point of treating heavy metal wastewater by a sulfide precipitation method.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art. Therefore, the invention aims to solve the problems of difficult separation of metal precipitates, large amount of generated slag, waste of valuable resources and the like in the process of a contaminated acid vulcanization precipitation method, and provides a method for removing heavy metal ions by an ultrasonic-assisted vulcanization precipitation method.
In the method, sodium sulfide solution or hydrogen sulfide is mixed with solution containing heavy metal for reaction, and then the mixture is filtered and separated.
The ultrasonic treatment time of the method is 0-40min, and the method preferably comprises the following steps: 4 to 8 minutes, more preferably 5 minutes.
The power of the ultrasonic treatment is 40-100W, and the following steps are preferred: 60-100W, more preferably 100W.
In the method, the temperature of ultrasonic treatment is 10-55 ℃, preferably 25-30 ℃, and further preferably 25 ℃.
In the method, the solution containing heavy metals comprises non-ferrous metal smelting waste acid wastewater.
In the method, the pH value of the solution containing the heavy metal ranges from 1 to 3, and the pH value is preferably 2.
The method, wherein the heavy metal comprises: copper, arsenic, zinc, preferably the heavy metal is copper.
The invention provides a method for removing heavy metal ions by an ultrasonic-assisted vulcanization precipitation method, which simulates and prepares non-ferrous metal smelting waste acid wastewater (acidic solution containing heavy metal copper ions), and comprises the following steps:
(1) preparing a copper sulfate solution and a sodium sulfide solution with certain molar concentrations;
(2) adjusting the initial pH value of the copper sulfate solution by using concentrated sulfuric acid or sodium hydroxide solution;
(3) in an ultrasonic environment, mixing a sodium sulfide solution with a copper sulfate solution in an equimolar amount to perform reaction;
(4) after reacting for a certain time, taking a certain amount of suspension sample for laser granularity analysis;
(5) and (4) carrying out suction filtration separation on the suspension liquid left in the step (4), washing a filter cake by using deionized water, drying the filter cake to constant weight, grinding to obtain metal sulfide precipitated powder, and analyzing the morphology and the structure of the metal sulfide precipitated powder under a scanning electron microscope.
Further, the initial concentrations of the copper sulfate solution and the sodium sulfide solution in the step (1) are 0.1mol/L and 0.2mol/L respectively.
Further, the initial pH value of the copper sulfate solution in the step (2) is adjusted to 2.
Further, the ultrasonic environment in step (3) includes: the ultrasonic treatment time is 0-40min, preferably 5min, the ultrasonic power is 40-100W, preferably 100W, and the ultrasonic temperature is 10-55 deg.C, preferably 25 deg.C.
Further, in the step (5), the filter cake is dried in an oven at 60-80 ℃ for 12-24 hours.
The beneficial effects obtained by adopting the scheme of the invention are as follows:
the invention provides a method for removing heavy metal ions by an ultrasonic-assisted vulcanization precipitation method, which introduces ultrasonic waves into the process of treating waste acid wastewater by a sulfide precipitation method for the first time. By adjusting ultrasonic parameters, the uniformity of the vulcanization reaction environment is effectively improved, and the vulcanization precipitation reaction efficiency is improved. The method avoids the problem of overhigh local concentration in the reactor, thereby reducing the supersaturation degree of the solution and ensuring the solution to be more uniformly distributed, and finally inhibiting the explosive homogeneous nucleation of the sulfide precipitation; in addition, the ultrasonic waves enable the precipitated particles to oscillate violently, mutual collision among the particles is aggravated, the particles are promoted to be aggregated into larger particles, and convenience is provided for subsequent solid-liquid separation. The method is simple and easy to implement, safe and clean, and high in treatment efficiency, provides favorable conditions for nucleation and growth of precipitated particles in the aspects of chemical reaction environment and physical settling property, promotes separation and recovery of valuable metals, and improves the treatment efficiency of treating the smelting waste acid wastewater by a sulfide precipitation method.
Drawings
FIG. 1 is a scanning electron microscope image of CuS precipitated particles obtained under different ultrasonic time conditions in example I;
FIG. 2 is a scanning electron microscope image of CuS precipitated particles obtained under different ultrasonic power conditions in example II;
FIG. 3 is a scanning electron microscope image of CuS precipitated particles obtained under different ultrasonic temperature conditions in example III;
FIG. 4 is a particle size distribution diagram and a scanning electron microscope image of the CuS precipitated particles obtained in the comparative example under the ultrasound-free condition.
Detailed Description
The present invention will be further described with reference to the following examples. The technical solutions in the embodiments of the present invention are clearly and completely described, 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.
The first embodiment is as follows: different time (5, 10, 20, 30min), power 100W and temperature 25 ℃;
4 sets of 200mL copper sulfate solutions (pH 2) having a concentration of 0.1mol/L were measured out from each of the 4 sets of 200mL copper sulfate solutions by a measuring cylinder and placed in an ultrasonic device in 4 500mL beakers. Then 4 groups of 100mL sodium sulfide solution with the concentration of 0.2mol/L are measured and poured into 4 beakers respectively, and the timing is started at the moment when the sodium sulfide solution is poured completely. The ultrasonic power of the ultrasonic machine is set to be 100W, the ultrasonic temperature is set to be 25 ℃, and 4 groups of reactions are respectively subjected to ultrasonic treatment for 5min, 10min, 20min and 30 min. After the completion of the ultrasonic treatment, 50mL of each suspension sample was sent to a laser particle sizer for particle size detection. According to the determination, the median particle diameters (D50) of 4 groups of copper sulfide precipitated particles treated by different ultrasonic time are 6.42 μm, 5.12 μm, 5.54 μm and 5.85 μm in sequence, the residual precipitates are subjected to suction filtration and deionized water washing, the precipitates are dried in an oven at 60 ℃ for 24 hours, and finally the precipitates are ground into powder and sent to a scanning electron microscope for scanning analysis of the morphology.
By adopting an ultrasonic-assisted vulcanization precipitation method, the particle size of the particles obtained under the ultrasonic condition of 5min is the largest, and if the ultrasonic time is too long, the mechanical action generated by the ultrasonic is strengthened, so that the particles are crushed, and the agglomeration among the particles is damaged. As can be seen from the scanning electron micrograph, the agglomeration effect of the precipitated particles after 5min of ultrasound is more obvious than that of the other three groups (as shown in figure 1).
Example two: different powers (40, 60, 80 and 100W), time 5min and temperature 25 ℃;
4 sets of 200mL copper sulfate solution (pH 2) with a concentration of 0.1mol/L were measured out with a measuring cylinder and poured into 4 500mL beakers, respectively, and the beakers were placed in an ultrasonic device. Then 4 groups of 100mL sodium sulfide solution with the concentration of 0.2mol/L are measured and poured into 4 groups of beakers respectively, and the timing is started at the moment when the reaction starts. Setting the ultrasonic temperature at 25 deg.c and 4 groups of reactions under the ultrasonic power of 40W, 60W, 80W and 100W for 5 min. After the ultrasonic treatment is finished, 50mL of samples are taken and sent to a laser particle size analyzer for particle size detection. According to the determination, the median particle diameters (D50) of 4 groups of copper sulfide precipitation particles treated by different ultrasonic powers are 5.83 microns, 6.32 microns, 6.39 microns and 6.42 microns in sequence, the residual precipitates are subjected to suction filtration and deionized water washing, the precipitates are dried in an oven at 60 ℃ for 24 hours, and finally the precipitates are ground into powder and sent to a scanning electron microscope for scanning analysis of the morphology of the precipitates.
By adopting an ultrasonic-assisted vulcanization precipitation method, the particle size of the obtained particles is increased along with the increase of the ultrasonic power within a set range. It can be seen from the scanned graph that the precipitated crystals obtained under the 4 groups of conditions have regular shapes and good agglomeration effect (as shown in fig. 2).
Example three: at different temperatures (10, 25, 40 and 55 ℃), for 5min and with the power of 100W;
4 sets of 200mL copper sulfate solution (pH 2) having a concentration of 0.1mol/L were measured out with a measuring cylinder and poured into 4 500mL beakers, respectively, which were placed in an ultrasonic device. Then 4 groups of 100mL sodium sulfide solution with the concentration of 0.2mol/L are measured and poured into 4 groups of beakers respectively, and the timing is started at the moment when the reaction starts. The ultrasonic power is set to be 100W, and 4 groups of reactions are subjected to ultrasonic treatment for 5min under the conditions of ultrasonic temperature of 10 ℃, 25 ℃, 40 ℃ and 55 ℃. After the ultrasonic treatment, 50mL of each sample was sent to a laser particle sizer for particle size detection. According to the determination, the median particle diameters (D50) of 4 groups of copper sulfide precipitation particles treated by different ultrasonic powers are 5.07 mu m, 6.42 mu m, 6.16 mu m and 5.81 mu m in sequence, the residual precipitates are subjected to suction filtration and deionized water washing, and are dried in an oven at 60 ℃ for 24 hours, and finally, the precipitates are ground into powder and sent to a scanning electron microscope for scanning analysis of the morphology.
The particle size of the obtained particles is increased and then decreased along with the increase of the ultrasonic temperature by adopting an ultrasonic-assisted vulcanization precipitation method. The vulcanization reaction rate is limited due to the excessively low temperature; the temperature is too high, the cavitation effect of the ultrasonic wave is obvious, the explosive property of crystal nucleus is promoted to be increased, and a large amount of fine particles are generated. As can be seen from the scanning electron microscope image, the produced crystal has smooth surface and is not easy to agglomerate especially under the condition of the ultrasonic temperature of 25 ℃ (figure 3).
Comparative example: time (5min), no ultrasound
200mL of a copper sulfate solution (pH 2) having a concentration of 0.1mol/L was measured by a measuring cylinder, the solution was poured into a 500mL beaker, 100mL of a sodium sulfide solution having a concentration of 0.2mol/L was measured, the solution was poured into the beaker, and the time was started at the moment the reaction started. After reacting for 5min, 50mL of sample is taken and sent to a laser particle size analyzer for particle size detection. And determining that the median diameter (D50) of the copper sulfide precipitate particles is 2.93 mu m, carrying out suction filtration and deionized water washing on the remaining precipitate, drying in an oven at 60 ℃ for 24h, finally grinding into powder, sending to a scanning electron microscope, and carrying out scanning analysis on the morphology of the powder.
Comparing the copper sulfide precipitates obtained under the ultrasonic and non-ultrasonic conditions, it can be found that the particle size of the obtained particles is remarkably increased and the stability and dispersibility of the crystals are better after the ultrasonic wave is introduced (fig. 4).
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the invention is not to be limited to the examples described herein, but rather to other embodiments that may be devised by those skilled in the art based on the teachings herein, and that various modifications, alterations, and substitutions are possible without departing from the spirit and scope of the present invention.
Claims (8)
1. A method for removing heavy metal ions by an ultrasonic-assisted vulcanization precipitation method is characterized in that ultrasonic waves are introduced in the process of vulcanization precipitation of the heavy metal ions, so that the reaction environment is improved, and the reaction performance is optimized.
2. The method according to claim 1, characterized in that a sodium sulfide solution or hydrogen sulfide gas is mixed with a solution containing heavy metals for reaction, and the obtained precipitate is separated by filtration.
3. The method according to claim 1 or 2, characterized in that the time of sonication is 10-40min, preferably: 4 to 8 minutes, more preferably 5 minutes.
4. The method according to claim 1 or 2, characterized in that the power of the sonication is 40-100W, preferably: 60-100W, more preferably 100W.
5. The method according to claim 1 or 2, characterized in that the temperature of the sonication is 10-55 ℃, preferably 25-30 ℃, further preferably 25 ℃.
6. The method according to claim 1, characterized in that the solution containing heavy metals is particularly non-ferrous metal metallurgy waste acid wastewater.
7. The method according to claim 1 or 6, characterized in that the pH of the solution containing the heavy metal is in the range of 1-3, preferably pH 2.
8. The method of claim 1, wherein said heavy metal comprises: copper, arsenic and zinc.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030082084A1 (en) * | 2001-05-30 | 2003-05-01 | Cort Steven L. | Methods for removing heavy metals from water using chemical precipitation and field separation methods |
| CN101456565A (en) * | 2009-01-09 | 2009-06-17 | 昆明理工大学 | Method for preparing magnesium hydrate nano powder by active acid leaching nickel-containing serpentine |
| CN106673160A (en) * | 2016-12-30 | 2017-05-17 | 四川师范大学 | Method for treating wastewater containing heavy metal |
| CN111018211A (en) * | 2018-10-09 | 2020-04-17 | 昆明理工大学 | Method for removing arsenic by adding zinc powder into ultrasonically-reinforced polluted acid |
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- 2021-08-30 CN CN202111001952.1A patent/CN114920381A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030082084A1 (en) * | 2001-05-30 | 2003-05-01 | Cort Steven L. | Methods for removing heavy metals from water using chemical precipitation and field separation methods |
| CN101456565A (en) * | 2009-01-09 | 2009-06-17 | 昆明理工大学 | Method for preparing magnesium hydrate nano powder by active acid leaching nickel-containing serpentine |
| CN106673160A (en) * | 2016-12-30 | 2017-05-17 | 四川师范大学 | Method for treating wastewater containing heavy metal |
| CN111018211A (en) * | 2018-10-09 | 2020-04-17 | 昆明理工大学 | Method for removing arsenic by adding zinc powder into ultrasonically-reinforced polluted acid |
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