CN112978880B - Filter element for removing heavy metals in water and use method thereof - Google Patents
Filter element for removing heavy metals in water and use method thereof Download PDFInfo
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- CN112978880B CN112978880B CN202110360270.3A CN202110360270A CN112978880B CN 112978880 B CN112978880 B CN 112978880B CN 202110360270 A CN202110360270 A CN 202110360270A CN 112978880 B CN112978880 B CN 112978880B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002122 magnetic nanoparticle Substances 0.000 claims abstract description 51
- 150000002500 ions Chemical class 0.000 claims abstract description 14
- 239000000696 magnetic material Substances 0.000 claims abstract description 12
- 239000011148 porous material Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract 3
- 230000002378 acidificating effect Effects 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000010146 3D printing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 238000011001 backwashing Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 239000006249 magnetic particle Substances 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 239000010865 sewage Substances 0.000 abstract description 13
- 238000001914 filtration Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002384 drinking water standard Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 8
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/06—Filters making use of electricity or magnetism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention provides a filter element for removing heavy metals in water and a using method thereof. The filter element is of a hollow structure with two open ends, one open end is an inlet end, and the other open end is an outlet end; the material of the filter core is soft magnetic material; the filter core is provided with a plurality of holes which penetrate from the inner side part of the hollow structure to the outer side. When the filter core is used, a magnetic field is applied to the outside of the filter core, the outlet end of the filter core is sealed, water containing magnetic nano particles is injected into the hollow structure from the inlet end, the magnetic nano particles are adsorbed by the filter core, and therefore heavy metal ions are adsorbed, and the water flows out of the pores. The filter element disclosed by the invention has the advantages of simple structure, convenience in manufacturing, high filtering effect, economy, practicability and no secondary pollution, after the filter element disclosed by the invention is used for filtering once, the concentration of heavy metal in water can be obviously reduced from 1.0mg/L to a value lower than the drinking water standard recommended by WHO, and the filter element has a good market prospect in industrial sewage treatment.
Description
Technical Field
The invention belongs to the technical field of magnetic materials and the technical field of sewage heavy metal treatment, and particularly relates to a filter element for removing heavy metals in water and a using method thereof.
Background
Various industrial activities cause the entry of a number of heavy metals (such as lead, mercury, cadmium, cobalt, etc.) into the water, which have toxic effects and can accumulate in the food chain, causing serious ecological and health risks.
In order to remove heavy metals from water, various methods have been developed, including chemical, physical, biological adsorption, and the like. Among them, filtration and adsorption are common methods, but have the following problems:
(1) In the filtering method, a filter element with a porous structure is used for filtering, but most of the existing filter elements are made of nylon, stainless steel meshes and the like, work in a severe environment and are easy to corrode.
(2) In the adsorption method, the magnetic nanoparticles have the advantages of large specific surface area, convenience in water separation, easiness in functionalization with different chemical groups and the like, so that the magnetic nanoparticles are an effective adsorbent for adsorbing heavy metals, and the adsorbent needs to be matched with a magnetic material and a magnetic field for use, so that the magnetic material adsorbs the magnetic nanoparticles under the action of the magnetic field, and the heavy metals are adsorbed and removed. Wherein, the adsorption efficiency of the magnetic nano-particles is related to the magnetic material and the magnetic field intensity. However, the current method has the following problems:
(a) At present, a rod-shaped magnetic material is used, and the adsorption efficiency of the magnetic material with the structure on magnetic nano particles under the action of a magnetic field is limited;
(b) The sewage treatment comprises static sewage treatment and dynamic sewage treatment, and when the sewage treatment capacity is large, the magnetic field needs to be improved; however, the magnetic field has a limited improvement range in the static sewage treatment at present, so that the static sewage treatment can only work in a small volume, the sewage treatment capacity is small, and the actual large-scale dynamic sewage treatment usually uses a high-gradient magnetic separator with magnetic induction leads, so that the cost is increased.
Disclosure of Invention
Aiming at the technical current situation, the invention combines filtration and adsorption, provides the filter element for removing the heavy metals in water, and can remove the heavy metals in water efficiently, economically and without secondary pollution.
The technical scheme of the invention is as follows: a filter core for removing heavy metal in water, which is characterized in that:
the filter element is of a hollow structure with two open ends, one open end is called an inlet end, and the other open end is called an outlet end;
the filter element is provided with a plurality of holes; each hole penetrates from the inner side to the outer side of the hollow structure, and the hole diameter is gradually reduced from the inner side to the outer side of the hollow structure;
the filter core is made of soft magnetic material.
Preferably, the hollow structure has an inner diameter that decreases gradually from the inlet end to the outlet end.
As an implementation mode, the whole filter core is of a hollow table body structure, the cross section structure of the filter core is not limited, and the filter core comprises a circle, an ellipse, a triangle, a rectangle, other regular polygons and the like.
Preferably, the pore diameter of the pores is between 100um and 100 mm.
Preferably, the filter core is made of soft magnetic ferrite.
The preparation method of the filter element of the invention is not limited. As an implementation mode, the method is prepared by a 3D printing method, and specifically comprises the following steps: dispersing particles of a soft magnetic material in a premix liquid containing a solvent, a binder, a dispersant, and the like to form a slurry; and (3) obtaining a filter core blank by using the slurry through a 3D printing method, and then drying and sintering to obtain the filter core.
The method for removing heavy metals in water by using the filter element comprises the following steps:
(1) Adding magnetic nanoparticles into water, wherein the magnetic nanoparticles adsorb heavy metal ions in the water;
(2) The filter core is placed in a magnetic field, and the filter core made of soft magnetic materials can adsorb magnetic nano particles under the action of the magnetic field; and (3) sealing the outlet end of the filter element, injecting the water treated in the step (1) into the hollow structure from the inlet end of the filter element, and adsorbing the magnetic nanoparticles by the filter element, so that heavy metal ions are adsorbed and the water flows out of the pores.
After the heavy metals in the water are filtered and adsorbed, in order to remove the magnetic nanoparticles adsorbed on the filter element, a flushing fluid formed by clear water without the magnetic nanoparticles enters the filter element from the outer side of the filter element through holes to flush the magnetic nanoparticles adsorbed on the filter element, and then flows out from the outlet end, so that the filter element is called back flush. For further deep cleaning of the filter element, it is preferred to first remove the magnetic field and then backwash the filter element. More preferably, an acidic substance is added to the rinse solution to make the rinse solution acidic. When the washing is carried out, acidic substances are added into the opening structure, and heavy metal ions can be separated from the magnetic nanoparticles, so that the magnetic nanoparticles can be recycled.
Or, the outlet end of the filter element is firstly closed, the filter element is backwashed, and then the outlet end of the filter element is opened. Preferably, the outlet end of the filter element is closed, an acidic substance is added into the filter element, the filter element is back-washed, heavy metal ions and magnetic nanoparticles can be separated under the action of the acidic substance, and finally the outlet end of the filter element is opened to recycle the magnetic nanoparticles.
Preferably, the magnetic nanoparticles are not limited, and include composite magnetic nanoparticles, magnetic nanoparticles coated with PAA or PEI, and the like.
Preferably, the magnetic field is detachable, so that the installation and removal are convenient.
Compared with the prior art, the invention has the following beneficial effects:
(1) When the water containing magnetic nanoparticles is injected into the hollow structure from the inlet end, the filter core can adsorb the magnetic nanoparticles under the action of a magnetic field, and the water is discharged from the pore structure, so that the aim of removing the heavy metals in the water is fulfilled; the specific surface area of the filter core with the hollow porous structure is large, so that the adsorption rate is greatly improved.
(2) The design hole diameter reduces from the filter core is inboard to the outside gradually, makes the water that contains magnetic nanoparticle flow in from great diameter, and minor diameter flows out, and magnetic nanoparticle is adsorbed on the pore wall gradually, has effectively avoided magnetic nanoparticle to pile up at the pore structure entry, causes the pore structure to block up and unable filterable problem, has realized magnetic nanoparticle's high efficiency filtration.
(3) The inner diameter of the filter core in the direction from the water inlet end to the outlet end is designed to be gradually reduced, so that the filter core is favorably flushed by water containing magnetic nanoparticles, and the filtering effect is further improved.
(4) According to the invention, the filter core is preferably prepared from the soft magnetic ferrite, so that the corrosion resistance is realized, and the soft magnetic ferrite filter core plays a role in strengthening an external magnetic field, thereby reducing the requirement on the strength of the external magnetic field.
(5) According to the invention, the filter element can be placed in the container by adopting a method of injecting from the inlet end and flowing out from the hole when removing heavy metals in water, and purified water is contained between the container and the filter element after adsorption and filtration, so that collection and treatment are convenient; the filter core is washed by a back washing method of entering the filter core from the hole, and the sewage after washing is discharged from the outlet end, so that the collection and treatment are convenient.
(6) The filter element has the advantages of simple structure, convenient manufacture, high filtering effect, economy, practicability and no secondary pollution, the concentration of heavy metal in water can be obviously reduced from 1.0mg/L to be lower than the drinking water standard recommended by WHO after the filter element is filtered once, and the filter element has good market prospect in industrial sewage treatment.
Drawings
Fig. 1 is a schematic structural view of a filter element in embodiment 1 of the present invention.
Fig. 2 is a schematic view of the structure of the hole of fig. 1.
The reference numerals in fig. 1-2 are: the filter element 1, the inlet end 2, the outlet end 3, the holes 4, one end opening 5 of the holes and the other end opening 6 of the holes.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, which are not intended to limit the invention to the details shown.
Example 1:
as shown in fig. 1, the filter element 1 for removing heavy metals in water is a hollow truncated cone structure with two open ends, one open end is called an inlet end 2, and the other open end is called an outlet end 3.
The inner diameter of the hollow structure gradually decreases from the inlet end 2 to the outlet end 3. In this embodiment, in the hollow circular truncated cone structure, the inner diameter of the inlet end 2 is 100mm, the outer diameter is 104mm, the inner diameter of the outlet end 3 is 60mm, the outer diameter is 64mm, and the height between the inlet end 2 and the outlet end 3 is 50mm.
The filter element 1 is provided with a plurality of holes 4, each of which penetrates from the inside to the outside of the hollow structure, and the hole diameter of each of which is gradually reduced from the inside to the outside of the hollow structure. For example, in fig. 1, one end opening 5 of the hole 4 is located inside the hollow structure, the other end opening 6 is located inside the hollow structure, the hole 4 is in a circular truncated cone shape as a whole, the inner diameter of the opening 5 is 10mm, and the inner diameter of the opening 6 is 2mm.
In this embodiment, the filter core is made of nickel-zinc ferrite soft magnetic material. The preparation method of the filter element comprises the following steps:
(1) Uniformly dispersing nickel-zinc ferrite powder with the average particle size of about 2um into a premixed solution containing a binder PVA, a plasticizer PEG and a small amount of a dispersing agent ECO-2100 to prepare stable slurry;
(2) And (2) performing 3D printing by using the slurry obtained in the step (1) to obtain a filter element blank shown in figure 1, drying, and performing high-temperature sintering treatment at 1300 ℃ to obtain the high-density nickel-zinc ferrite filter element.
The method for removing heavy metals in the filtered water in the embodiment is utilized as follows:
and (3) applying a detachable magnetic field of as low as 0.07T to the prepared filter element. Closing the outlet end 3 of the filter element. In the presence of Pb 2+ Adding PAA coated Fe into wastewater with the concentration of 1mg/L 3 O 4 Nanoparticles 25mg. The wastewater is injected into the hollow structure from the inlet end 2 of the filter element, water flows out from the holes of the filter element, the magnetic nanoparticles are adsorbed by the filter element, and thus the heavy metal ions are adsorbed by the filter element to obtain the water for removing the heavy metal ions.
After detection, pb in the water flowing out of the filter element 2+ The concentration was 0.009mg/L. The test standard is GB/T32992-2016.
After the filter core is used, in order to remove the magnetic nanoparticles adsorbed on the filter core, the filter core is back-flushed by using clear water without adding the magnetic nanoparticles to form flushing liquid, namely, water flows into the inner side from the outer side of the filter core through holes to flush the magnetic nanoparticles adsorbed on the filter core, and then flows out from the outlet end. In order to further deeply clean the filter element, the magnetic field is firstly removed, then the filter element is backwashed by clean water, preferably, an acidic substance is added into the washing liquid to ensure that the washing liquid is acidic, and heavy metal ions can be separated from the magnetic nano particles during washing, so that the magnetic nano particles can be recycled.
Example 2:
in this example, the filter element for removing heavy metals from water had substantially the same structure as in example 1.
In this embodiment, the preparation method of the filter element is as follows:
(1) Uniformly dispersing nickel-zinc ferrite powder with the average particle size of about 2 mu m into premixed liquid of photosensitive resin PEGDA, solvent EG, photoinitiator TPO and the like to prepare stable slurry.
(2) And (2) performing 3D printing by using the slurry obtained in the step (1) to obtain a filter element blank shown in figure 1, drying, and performing high-temperature sintering treatment at 1300 ℃ to obtain the high-density nickel-zinc ferrite filter element.
The method for removing heavy metals in water by using the filter element in the embodiment comprises the following steps:
and (3) applying a detachable magnetic field as low as 0.07T to the prepared filter element. Closing the outlet end 3 of the filter element. In the presence of Pb 2+ Sep-Fe is added into waste water with the concentration of 1mg/L 3 O 4 -MnO 2 Composite nanoparticles 25mg. The wastewater is injected into the filter core from the inlet end 3 of the filter core, water flows out from the holes of the filter core, and the magnetic nanoparticles are adsorbed by the filter core, so that heavy metal ions are adsorbed by the filter core to obtain the water for removing the heavy metal ions.
The detected Pb in the water flowing out from the filter element 2+ The concentration was 0.007mg/L. The test standard is GB/T32992-2016.
After use, the magnetic nanoparticles adsorbed on the filter element are removed. Firstly, the outlet end of the filter element is closed, clear water without magnetic nano particles is used for forming flushing liquid to back flush the filter element, namely, water flow enters the inner side from the outer side of the filter element through a hole to flush the magnetic nano particles adsorbed on the filter element, and then the outlet end is opened, and sewage flows out. Preferably, acidic substances are added into the filter element, the filter element is back-washed, heavy metal ions and magnetic nanoparticles can be separated under the action of the acidic substances, and finally the outlet end is opened to recycle the magnetic nanoparticles.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A filter core for removing heavy metal in water, which is characterized in that: the filter element is of a hollow structure with two open ends, one open end is called an inlet end, and the other open end is called an outlet end;
the filter element is provided with a plurality of holes, the holes penetrate from the inner side to the outer side of the hollow structure, and the hole diameter is gradually reduced from the inner side to the outer side of the hollow structure, so that water containing magnetic nanoparticles flows in from a larger diameter and flows out from a smaller diameter, and the magnetic nanoparticles are gradually adsorbed on the hole wall;
the material of the filter core is soft magnetic material;
the method for removing the heavy metals in the water by using the filter element comprises the following steps:
(1) Adding magnetic nanoparticles into water, wherein the magnetic nanoparticles adsorb heavy metal ions in the water;
(2) Applying a magnetic field to the filter element; sealing the outlet end of the filter element, injecting the water treated in the step (1) into the hollow structure from the inlet end of the filter element, and adsorbing the magnetic nanoparticles by the filter element, so that heavy metal ions are adsorbed and the water flows out of the pores;
after heavy metals in water are filtered and adsorbed, flushing liquid formed by clear water without magnetic nanoparticles enters the inner side of the filter core from the outer side of the filter core through the holes, so that the magnetic nanoparticles adsorbed on the filter core are flushed, and then the flushing liquid flows out from the outlet end, and the filter core is called as a backwashing filter core.
2. A filter element according to claim 1, wherein: the inner diameter of the hollow structure is gradually reduced from the inlet end to the outlet end.
3. A filter element according to claim 1, wherein: the whole filter core is of a hollow table structure.
4. A filter element according to claim 3, wherein: the cross section of the hollow table body structure is circular, oval, triangular, rectangular or other regular polygons.
5. A filter element according to claim 1, wherein: the aperture is between 100um and 100 mm.
6. A filter element according to claim 1 wherein: the material of the filter core is soft magnetic ferrite.
7. A filter element according to claim 1, wherein: dispersing soft magnetic particles in a pre-mixing liquid containing a binder, a dispersing agent and a solvent to form slurry; and (3) obtaining a filter core blank by using the slurry through a 3D printing method, and then drying and sintering to obtain the filter core.
8. A filter element according to claim 1, wherein: the magnetic field is removed first, and then the filter element is back-washed.
9. A filter element according to claim 1, wherein: adding acidic substance into the rinse solution to make the rinse solution acidic.
10. A filter element according to claim 1 wherein: after heavy metals in water are filtered and adsorbed, the outlet end of the filter element is closed, flushing liquid formed by clear water without magnetic nanoparticles enters the inner side of the filter element from the outer side of the filter element through holes, so that the magnetic nanoparticles adsorbed on the filter element are flushed, the filter element is called as a backwashing filter element, and then the outlet end of the filter element is opened.
11. A filter element according to claim 10, wherein: firstly, the outlet end of the filter element is closed, acidic substances are added into the filter element, the filter element is back-washed, heavy metal ions are separated from the magnetic nanoparticles under the action of the acidic substances, and finally, the outlet end of the filter element is opened, and the magnetic nanoparticles are recycled.
12. A filter element according to claim 1 wherein: the magnetic field is detachable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110360270.3A CN112978880B (en) | 2021-04-02 | 2021-04-02 | Filter element for removing heavy metals in water and use method thereof |
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| CN202110360270.3A CN112978880B (en) | 2021-04-02 | 2021-04-02 | Filter element for removing heavy metals in water and use method thereof |
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| CN112978880B true CN112978880B (en) | 2023-02-07 |
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| CN113333363A (en) * | 2021-06-24 | 2021-09-03 | 嘉兴汉工汽车紧固件有限公司 | Belt cleaning device is used in production of gasbag screw thread sleeve |
| CN113648703A (en) * | 2021-09-22 | 2021-11-16 | 宁波磁性材料应用技术创新中心有限公司 | Assembled filter element for removing heavy metals in water and using method thereof |
| CN113800610A (en) * | 2021-10-16 | 2021-12-17 | 宁波磁性材料应用技术创新中心有限公司 | Assembled magnetic filter element and magnetic filter device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101982219A (en) * | 2010-09-07 | 2011-03-02 | 苏州世名科技股份有限公司 | Basket wet process filtering and deironing integration device |
| CN103240173B (en) * | 2012-02-08 | 2015-11-18 | 香港科技大学 | Magnetic separtor and there is the water treatment system of this magnetic separtor |
| CN104368183A (en) * | 2014-11-07 | 2015-02-25 | 南通海景船舶压载水处理系统股份有限公司 | Filter core of filter |
| CN105457599A (en) * | 2015-11-17 | 2016-04-06 | 中国科学院大学 | Synthesis of magnetic nano-adsorbent material and application method thereof to the treatment of heavy metal waste liquid |
| CN205495079U (en) * | 2015-11-23 | 2016-08-24 | 沈智奇 | Automatic alternative filter |
| CN206473897U (en) * | 2017-01-18 | 2017-09-08 | 东莞市精滤电子科技有限公司 | Pin hole filter core |
| CN206676091U (en) * | 2017-03-29 | 2017-11-28 | 佛山市顺德区赛盛尔电子科技有限公司 | A kind of filter with detachable magnetic filtration screen |
| CN212262549U (en) * | 2020-01-21 | 2021-01-01 | 深圳市曼恩斯特科技有限公司 | Filtering device for filtering slurry |
| CN111362427B (en) * | 2020-04-17 | 2021-06-04 | 华禹源环保科技(淄博)有限公司 | 3D printing material for treating microorganism-loaded heavy metal sewage and preparation method and application thereof |
| CN212091131U (en) * | 2020-05-11 | 2020-12-08 | 浙江玖昱科技有限公司 | High-filtering-performance powder sintered filter element |
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