CN116422304A - Method for removing low-concentration antimony in mine tailing strong acid leaching liquid - Google Patents
Method for removing low-concentration antimony in mine tailing strong acid leaching liquid Download PDFInfo
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- 239000002253 acid Substances 0.000 title claims abstract description 55
- 229910052787 antimony Inorganic materials 0.000 title claims abstract description 52
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000002386 leaching Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 title claims abstract description 13
- 239000003463 adsorbent Substances 0.000 claims abstract description 51
- 238000001179 sorption measurement Methods 0.000 claims abstract description 39
- 239000012621 metal-organic framework Substances 0.000 claims abstract description 32
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 31
- 229910007926 ZrCl Inorganic materials 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 10
- 238000000967 suction filtration Methods 0.000 claims description 10
- -1 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000007847 structural defect Effects 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims 16
- 239000003929 acidic solution Substances 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 10
- 150000001462 antimony Chemical class 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 27
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 17
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000003446 ligand Substances 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 239000013207 UiO-66 Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910007746 Zr—O Inorganic materials 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
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- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 238000001308 synthesis method Methods 0.000 description 1
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- 230000004580 weight loss Effects 0.000 description 1
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/02—Obtaining antimony
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/223—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
- B01J20/226—Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
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Abstract
A method for removing low-concentration antimony in a strong acid leaching solution of mine tailings relates to a method for removing antimony in mine tailings. The invention aims to solve the technical problems that the structure of an antimony adsorbent in the strong acid leaching solution of mine tailings is easily damaged, so that the adsorption performance of the antimony adsorbent is obviously reduced. The modified metal organic framework is prepared simply, directly and mildly under the condition by means of a defect engineering strategy, and is applied to the removal of low-concentration antimony in the strong acid leaching liquid of mine tailings. The adsorbent UiO-66-HCl has higher antimony removal efficiency, solves the technical problems of low removal efficiency, poor stability and the like of a common adsorbent under a strong acid condition, and provides a break for removing low-concentration antimony under the strong acid condition. The UiO-66-HCl prepared by the method has good adsorption performance on low-concentration Sb (V) under the strong acid condition, has higher removal efficiency, and the maximum removal rate can reach 83.75 percent.
Description
Technical Field
The invention relates to a method for removing antimony in mine tailings.
Background
With the rapid development of industrialization and the continuous increase of the demand for metal mineral resources, tailings become the largest amount of industrial waste residues in the world. A large amount of tailings generated in mining are accumulated on the ground surface of a mining area and subjected to weathering, erosion and rainwater dripping for a long time, a large amount of acid wastewater is usually generated, and heavy metals such as antimony and arsenic are carried for emission, so that the local water and soil environment is seriously damaged. Along with the wide application of antimony and compounds thereof, the produced wastewater and leaching water produced in rainfall after slag storage have serious influence on the surrounding environment while resources are exploited. Therefore, leaching of antimony in mine tailings and removal of low-concentration antimony in a strongly acidic environment are urgent.
When mine tailings are treated, the mine tailings are generally soaked in a strong acid solution to obtain a strong acid antimony-containing waste liquid, and after the pH is adjusted to be weak acid, antimony is removed. Mature technologies for removing antimony in wastewater comprise an adsorption method, a chemical precipitation method, an ion exchange method, a membrane separation method, an electrochemical method and the like. In contrast, the adsorption method is considered to be an effective and promising technology for removing heavy metals from wastewater because of wide application range and less pollution problems. The traditional adsorption materials such as active carbon, silicon dioxide, carbon nano tube and the like have the defects of low adsorption capacity, slow adsorption rate, poor selective adsorption capacity, difficult regeneration and the like in complex actual wastewater, and more importantly, the structure of the adsorbent is extremely easily damaged in a strong acid environment, so that the adsorption performance of the adsorbent is obviously reduced. Therefore, developing an adsorbent with strong water stability, strong and strong acid-resistant structure is of great importance in wastewater treatment.
The Metal Organic Frameworks (MOFs) are also called porous coordination polymers, and are novel porous crystal materials formed by combining a series of carboxylic acid ligands and metal ions through strong covalent bonds. Because of its unique structure, large specific surface area and extremely strong water stability, it is of great interest as an environmental remediation adsorbent. Defect engineering is a commonly used effective strategy to improve material stability and increase MOFs active site utilization, thereby improving contaminant adsorption performance. By means of a defect engineering strategy, the MOF material with structural defects is reasonably designed, and more active sites are provided for the combination of metal ions, so that the MOF material is possibly applied to the mine tailing strong acid leaching liquid to remove low-concentration antimony.
Disclosure of Invention
The invention aims to solve the technical problem that the structure of an antimony adsorbent in the existing mine tailing strong acid leaching solution is extremely easy to damage, so that the adsorption performance of the antimony adsorbent is obviously reduced, and provides a method for removing low-concentration antimony in the mine tailing strong acid leaching solution.
The method for removing low-concentration antimony in the mine tailing strong acid leaching liquid comprises the following steps:
1. immersing mine tailings in a strong acid solution, stirring for 24-25 hours at room temperature by using a magnetic stirrer, and carrying out suction filtration on the solution to obtain filtrate, namely the strong acid mine tailings leaching solution, wherein the pH value of the strong acid mine tailings leaching solution is 0.5-0.6;
2. the method comprises the steps of (1) putting a metal organic framework adsorbent with a structural defect into the strong acid mine tailing leaching solution in the first step, reacting for 24-25 hours in a constant temperature vibrating box to obtain suspension, filtering the suspension by using a filter head with the specification of 0.22 mu m, and collecting supernatant to finish the adsorption of low-concentration antimony;
the volume ratio of the mass of the metal organic framework adsorbent to the strong acid mine tailing leaching liquid in the first step is 1mg (1 mL-2 mL);
the preparation method of the metal organic framework adsorbent comprises the following steps:
1. ZrCl is added to 4 And H 2 BDC (terephthalic acid) is dissolved in DMF, and is ultrasonically treated for 30 min-35 min in an ultrasonic cleaner at room temperature; then adding hydrochloric acid solution, and continuing to carry out ultrasonic treatment for 30-35 min;
the ZrCl 4 And H is 2 The ratio of the amounts of BDC substances is 1 (1-2);
HCl and ZrCl in the hydrochloric acid solution 4 The mass ratio of the substances is (36-37) 1;
2. transferring the solution into a polytetrafluoroethylene reaction kettle, sealing, placing into a blast drying box, performing hydrothermal reaction at the constant temperature of 120-130 ℃ for 48-50 h, performing suction filtration, washing 3-5 times by using DMF and absolute ethyl alcohol respectively, and drying to obtain the metal organic framework adsorbent UIO-66-HCl.
The adsorbent (UiO-66-HCl) prepared by the invention has good adsorption effect on low-concentration antimony in the mine tailing strong acid leaching liquid, and the reason is as follows: in the first step of the invention, hydrochloric acid is added, the pKa of the hydrochloric acid is-8, and the pKa of trifluoroacetic acid is 0.23, compared with trifluoroacetic acid, the hydrochloric acid has lower pKa, the generated hydrogen ions have larger quantity, the interference of the hydrogen ions can be resisted, and the site activity can be maintained under the strong acid condition, so that the adsorption effect of UiO-66-HCl on antimony in the strong acid solution is improved; the stability of the metal organic framework under the strong acid condition lays a foundation for the adsorption of antimony in the wastewater, the Zr-O bond in the adsorbent coordinates with the antimony, so that the adsorption of the antimony is caused, the adsorbent with structural defects provides more effective adsorption sites for the adsorption of the antimony, and the adsorption capacity of the antimony is enhanced.
The modified metal organic framework is prepared simply, directly and mildly under the condition by means of a defect engineering strategy, and is applied to the removal of low-concentration antimony in the strong acid leaching liquid of mine tailings. The adsorbent UiO-66-HCl obtained by adopting the synthesis method provided by the invention has higher antimony removal efficiency, solves the technical problems of low removal efficiency, poor stability and the like of a common adsorbent under a strong acid condition, and provides a break for removing low-concentration antimony under the strong acid condition. The UiO-66-HCl with structural defects prepared by the method has good adsorption performance on low-concentration Sb (V) under the strong acid condition, has higher removal efficiency, and the maximum removal rate can reach 83.75 percent.
Drawings
FIG. 1 is a TG plot of a metal-organic framework adsorbent prepared in test one, comparative test one, and comparative test two;
FIG. 2 is a graph of adsorption kinetics of a metal organic framework adsorbent to antimony in test two;
FIG. 3 is a XRD pattern of adsorbent UIO-66-HCl before and after adsorption in test II;
FIG. 4 is a SEM of the adsorbent of test two prior to adsorption of UiO-66-HCl;
FIG. 5 is an SEM of the adsorbent of test two after adsorption of UiO-66-HCl.
Detailed Description
The first embodiment is as follows: the embodiment is a method for removing low-concentration antimony in a strong acid leaching solution of mine tailings, which specifically comprises the following steps:
1. immersing mine tailings in a strong acid solution, stirring for 24-25 hours at room temperature by using a magnetic stirrer, and carrying out suction filtration on the solution to obtain filtrate, namely the strong acid mine tailings leaching solution, wherein the pH value of the strong acid mine tailings leaching solution is 0.5-0.6;
2. the method comprises the steps of (1) putting a metal organic framework adsorbent with a structural defect into the strong acid mine tailing leaching solution in the first step, reacting for 24-25 hours in a constant temperature vibrating box to obtain suspension, filtering the suspension by using a filter head with the specification of 0.22 mu m, and collecting supernatant to finish the adsorption of low-concentration antimony;
the volume ratio of the mass of the metal organic framework adsorbent to the strong acid mine tailing leaching liquid in the first step is 1mg (1 mL-2 mL);
the preparation method of the metal organic framework adsorbent comprises the following steps:
1. ZrCl is added to 4 And H 2 BDC is dissolved in DMF, and is ultrasonically treated for 30 min-35 min in an ultrasonic cleaner at room temperature; then adding hydrochloric acid solution, and continuing to carry out ultrasonic treatment for 30-35 min;
the ZrCl 4 And H is 2 The ratio of the amounts of BDC substances is 1 (1-2);
HCl and ZrCl in the hydrochloric acid solution 4 The mass ratio of the substances is (36-37) 1;
2. transferring the solution into a polytetrafluoroethylene reaction kettle, sealing, placing into a blast drying box, performing hydrothermal reaction at the constant temperature of 120-130 ℃ for 48-50 h, performing suction filtration, washing 3-5 times by using DMF and absolute ethyl alcohol respectively, and drying to obtain the metal organic framework adsorbent UIO-66-HCl.
The second embodiment is as follows: the first difference between this embodiment and the specific embodiment is that: the strong acid solution is a king water solution. The other is the same as in the first embodiment.
And a third specific embodiment: the second difference between this embodiment and the second embodiment is that: the volume concentration of the aqua regia solution is 10%. The other is the same as in the second embodiment.
The specific embodiment IV is as follows: this embodiment differs from one of the first to third embodiments in that: the pH value of the strong acid mine tailing leaching solution is 0.5. The other is the same as in one of the first to third embodiments.
Fifth embodiment: the fourth difference between this embodiment and the third embodiment is that: the volume ratio of the mass of the metal organic framework adsorbent to the strong acid mine tailing leaching liquid in the first step is 1 mg/1 mL. The other is the same as in the fourth embodiment.
Specific embodiment six: the fifth difference between this embodiment and the third embodiment is that: the mass concentration of the hydrochloric acid solution is 36%. The other is the same as in the fifth embodiment.
The invention was verified with the following test:
test one: the test is a preparation method of a metal organic framework adsorbent, and the specific process is as follows:
1. 0.24g of ZrCl 4 And 0.161g of H 2 BDC was dissolved in 50mL DMF and sonicated in an ultrasonic cleaner for 30min at room temperature; then hydrochloric acid solution (mass concentration) is added36%) as a regulator, continuing to carry out ultrasonic treatment for 30min;
HCl and ZrCl in the hydrochloric acid solution 4 The mass ratio of the substances is 36:1;
2. transferring the solution into a polytetrafluoroethylene reaction kettle, sealing, placing into a forced air drying box, performing hydrothermal reaction at the constant temperature of 120 ℃ for 48 hours, performing suction filtration, washing 3 times by using DMF and absolute ethyl alcohol respectively, and drying at 60 ℃ to obtain the metal organic framework adsorbent UIO-66-HCl.
Comparative test one: the test is a preparation method of a metal organic framework adsorbent, and the specific process is as follows:
1. 0.24g of ZrCl 4 And 0.161g of H 2 BDC was dissolved in 50mL DMF and sonicated in an ultrasonic cleaner for 30min at room temperature; then adding trifluoroacetic acid as a regulator, and continuing ultrasonic treatment for 30min;
the ZrCl 4 And H is 2 The mass ratio of BDC is 1:1;
the trifluoroacetic acid and ZrCl 4 The mass ratio of the substances is 36:1;
2. transferring the solution into a polytetrafluoroethylene reaction kettle, sealing, placing into a forced air drying box, performing hydrothermal reaction at the constant temperature of 120 ℃ for 48 hours, performing suction filtration, washing 3 times with DMF and absolute ethyl alcohol respectively, drying at 60 ℃ for 12 hours, and finally grinding and sieving the dried powder to obtain the metal organic framework adsorbent UIO-66-TFA.
And (2) a comparison test II: the test is a preparation method of a metal organic framework adsorbent, and the specific process is as follows:
1. 0.24g of ZrCl 4 And 0.161g of H 2 BDC was dissolved in 50mL DMF and sonicated in an ultrasonic cleaner for 30min at room temperature;
2. transferring the solution into a polytetrafluoroethylene reaction kettle, sealing, placing into a blast drying box, performing hydrothermal reaction at the constant temperature of 120 ℃ for 48 hours, performing suction filtration, washing 3 times by using DMF and absolute ethyl alcohol respectively, and drying at 60 ℃ to obtain the metal organic framework adsorbent UIO-66.
FIG. 1 is a test one, a comparative testTG plots of metal organic framework adsorbents prepared in test one and comparative test two, according to the report that UiO-66 contains 6 ligands per unit molecule, the expected mass loss is 54.60% of the total mass. From the figure, it can be seen that UiO-66-HCl and corresponding H to UiO-66-TFA 2 The actual weight loss of BDC ligand was 47.11% and 42.16%, respectively; calculation of the number of ligands per unit found H of UiO-66-HCl and UiO-66-TFA 2 The BDC numbers were about 5.2 and 4.6 in order and the corresponding ligand defects numbers were 0.8 and 1.4 in order, indicating that the addition of modulators (trifluoroacetic acid and HCl) could introduce ligand defects while UiO-66-TFA had more defect content.
And (2) testing II: the test is a method for removing low-concentration antimony in a strong acid leaching solution of mine tailings, and specifically comprises the following steps:
1. immersing 10mg of mine tailings in the aqua regia solution, stirring for 24 hours at room temperature by using a magnetic stirrer, and then carrying out suction filtration on the solution to obtain filtrate, namely strong acid mine tailings leaching solution; the volume concentration of the aqua regia solution is 10%;
2. 20mg of UiO-66-HCl prepared in test one, 20mg of UiO-66-TFA prepared in comparative test one and 20mg of UiO-66 prepared in comparative test two are respectively put into 3 parts of strong acid mine tailing leaching liquid prepared in step one, the materials are placed in a constant temperature shaking box, the temperature is 25 ℃, the rotation speed of a shaking machine is 180rpm, supernatant is taken by using a 1mL syringe when shaking for 30s, 1min, 5min, 30min, 60min, 90min, 120min, 180min and 240min respectively, and after filtering by using a filter head with the specification of 0.22 mu m, the concentration of antimony in the solution is measured by using an atomic absorption spectrophotometer.
Table 1 shows the water quality components of the strong acid mine tailing leaching solution in the step one of the test two, and shows that 10% of aqua regia is leached to obtain strong acid, wherein the concentration of antimony in the mine tailing is 11.3428mg/L, and the pH value is 0.5.
TABLE 1 Water quality Components in actual tailings leachate
FIG. 2 is a graph showing the adsorption kinetics of the metal organic framework adsorbent to antimony in test II, and it can be seen that UiO-66-HCl shows the maximum adsorption performance to antimony compared with UiO-66 and UiO-66-TFA, and the removal efficiency of antimony can reach 83.75%. Owing to the Zr-O bond with strong coordination ability in UiO-66 and UiO-66-HCl, the catalyst can be kept stable in a strong acid environment, and besides, a certain number of defects exist in the UiO-66-HCl, so that sufficient adsorption sites are provided for the adsorption of antimony, and the adsorption performance of antimony is improved. However, the UiO-66-TFA has relatively many defects, and is poor in stability under a strong acid environment, which may cause structural destruction of the adsorbent, thereby resulting in a decrease in adsorption capacity.
FIG. 3 shows XRD change patterns of the adsorbent UiO-66-HCl before and after adsorption in the second test, the UiO-66-HCl-Sb (V) is adsorbed, and it can be seen that main characteristic peaks of the adsorbent after the adsorption of Sb (V) still exist, but the strength is slightly reduced, which indicates that the Sb (V) is successfully captured by the adsorbent, the crystal structure of the adsorbent material after the adsorption is basically unchanged, and the adsorbent shows a certain stability.
FIG. 4 shows the SEM before adsorption of the adsorbent UiO-66-HCl in test II, and FIG. 5 shows the SEM after adsorption of the adsorbent UiO-66-HCl in test II, it can be seen that the UiO-66-HCl before adsorption of antimony has different particle sizes, the surface of the material becomes rough after adsorption of Sb (V), and Sb (V) is successfully captured by the adsorbent.
Claims (6)
1. A method for removing low-concentration antimony in a mine tailing strong acid leaching solution is characterized by comprising the following steps of:
1. immersing mine tailings in a strong acid solution, stirring for 24-25 hours at room temperature by using a magnetic stirrer, and carrying out suction filtration on the solution to obtain filtrate, namely the strong acid mine tailings leaching solution, wherein the pH value of the strong acid mine tailings leaching solution is 0.5-0.6;
2. the method comprises the steps of (1) putting a metal organic framework adsorbent with a structural defect into the strong acid mine tailing leaching solution in the first step, reacting for 24-25 hours in a constant temperature vibrating box to obtain suspension, filtering the suspension by using a filter head with the specification of 0.22 mu m, and collecting supernatant to finish the adsorption of low-concentration antimony;
the volume ratio of the mass of the metal organic framework adsorbent to the strong acid mine tailing leaching liquid in the first step is 1mg (1 mL-2 mL);
the preparation method of the metal organic framework adsorbent comprises the following steps:
1. ZrCl is added to 4 And H 2 BDC is dissolved in DMF, and is ultrasonically treated for 30 min-35 min in an ultrasonic cleaner at room temperature; then adding hydrochloric acid solution, and continuing to carry out ultrasonic treatment for 30-35 min;
the ZrCl 4 And H is 2 The ratio of the amounts of BDC substances is 1 (1-2);
HCl and ZrCl in the hydrochloric acid solution 4 The mass ratio of the substances is (36-37) 1;
2. transferring the solution into a polytetrafluoroethylene reaction kettle, sealing, placing into a blast drying box, performing hydrothermal reaction at the constant temperature of 120-130 ℃ for 48-50 h, performing suction filtration, washing 3-5 times by using DMF and absolute ethyl alcohol respectively, and drying to obtain the metal organic framework adsorbent UIO-66-HCl.
2. The method for removing low-concentration antimony from a strongly acidic leach solution of mine tailings according to claim 1, wherein the strongly acidic solution is an aqueous solution.
3. The method for removing low-concentration antimony from a strongly acidic leach solution of mine tailings according to claim 2, wherein the aqua regia solution has a volume concentration of 10%.
4. The method for removing low-concentration antimony from a strongly acidic mine tailing leaching solution according to claim 1, wherein the pH of the strongly acidic mine tailing leaching solution is 0.5.
5. The method for removing low-concentration antimony from strong acid leachate of mine tailings, according to claim 1, wherein the volume ratio of the mass of the metal organic framework adsorbent to the strong acid mine tailings leachate of the first step is 1 mg/1 ml.
6. The method for removing low-concentration antimony in a strongly acidic leach solution of mine tailings according to claim 1, wherein the mass concentration of the hydrochloric acid solution is 36%.
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