CN114768600B - Stirring device for preparing fly ash magnetic bead-activated carbon composite adsorbent - Google Patents
Stirring device for preparing fly ash magnetic bead-activated carbon composite adsorbent Download PDFInfo
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- CN114768600B CN114768600B CN202210506881.9A CN202210506881A CN114768600B CN 114768600 B CN114768600 B CN 114768600B CN 202210506881 A CN202210506881 A CN 202210506881A CN 114768600 B CN114768600 B CN 114768600B
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- 238000003756 stirring Methods 0.000 title claims abstract description 106
- 239000011324 bead Substances 0.000 title claims abstract description 97
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 239000003463 adsorbent Substances 0.000 title claims abstract description 30
- 239000010881 fly ash Substances 0.000 title claims abstract description 23
- 238000005192 partition Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000005570 vertical transmission Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 229920001661 Chitosan Polymers 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000008367 deionised water Substances 0.000 description 21
- 229910021641 deionized water Inorganic materials 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 239000002689 soil Substances 0.000 description 20
- 239000000243 solution Substances 0.000 description 15
- 239000006087 Silane Coupling Agent Substances 0.000 description 14
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 description 14
- 239000007864 aqueous solution Substances 0.000 description 14
- 239000003795 chemical substances by application Substances 0.000 description 13
- 239000003431 cross linking reagent Substances 0.000 description 9
- 229910001385 heavy metal Inorganic materials 0.000 description 9
- 239000005416 organic matter Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 7
- 238000002386 leaching Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000006148 magnetic separator Substances 0.000 description 7
- 239000011259 mixed solution Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 7
- 230000000149 penetrating effect Effects 0.000 description 7
- 238000012216 screening Methods 0.000 description 7
- 235000019830 sodium polyphosphate Nutrition 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000003802 soil pollutant Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- 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
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a stirring device for preparing a fly ash magnetic bead-activated carbon composite adsorbent, which comprises a tank body, a rotatable central shaft, rotating shafts circumferentially distributed on the outer ring of the central shaft, first stirring paddles circumferentially distributed on the outer ring of the rotating shafts, and second stirring paddles transversely rotatably installed in the lower part of the tank body, wherein the central shaft drives the rotating shafts to rotate simultaneously, a connecting plate and a partition plate are installed in the tank body, a sliding block is slidingly connected on the connecting plate, the upper end of the first stirring paddles is rotationally connected with the sliding block, column holes are uniformly distributed in the partition plate, sliding rods are slidingly embedded in the column holes, springs are arranged between the outer ends of the sliding rods and the column holes, the first stirring paddles penetrate through the partition plate and the sliding rods, the first stirring paddles are rotationally connected with the sliding rods, the rotating shafts drive the first stirring paddles to rotate and reciprocate inside and outside, and the central shaft is vertically in transmission connection with the second stirring paddles. The device can improve the uniformity of the particle size of the modified magnetic beads, promote the uniform coating of chitosan on the magnetic beads, and ensure the magnetic correspondence of the modified magnetic beads, thereby ensuring the adsorption effect of the product.
Description
Technical Field
The invention relates to the technical field of soil remediation agent production equipment, in particular to a stirring device for preparing a fly ash magnetic bead-activated carbon composite adsorbent.
Background
The existing soil restoration agent comprises a heavy metal curing agent, an organic matter degradation agent and the like, wherein the heavy metal curing agent still exists in soil in another form after curing in the in-situ restoration process and cannot be thoroughly separated, and the heavy metal leakage risk still exists after the environment changes or the residual agent is stimulated by the environment condition; and after the soil is restored by using the organic matter degradation agent, part of degradation substances are remained in the soil, and the risk of soil recontamination exists. Therefore, there is a need to develop a composite soil restoration agent to solve the above-mentioned problems.
In the process of preparing the composite soil restoration agent, a stirring device is usually needed, but the stirring effect of the existing stirring device is not very ideal, and the phenomena of raw material agglomeration, uneven particle distribution and the like still exist in the obtained product, so that the effect of the soil restoration agent is affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a preparation method of the fly ash magnetic bead-activated carbon composite adsorbent, which can effectively adsorb soil pollutants, has high adsorption efficiency and strong adsorption capacity, can separate and recycle the composite adsorbent, and avoids the risk of soil recontamination existing in the traditional soil restoration agent.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then soaking the magnetic beads in alkaline solution for 2-5 h to obtain pretreated magnetic beads; the method comprises the steps of carrying out preliminary modification on the magnetic beads by alkali liquor, removing or passivating microelements contained in the magnetic beads, and increasing the specific surface area of the magnetic beads so as to ensure the coating of the magnetic beads by the subsequent chitosan;
(b) The preparation method comprises the steps of adopting deionized water to wash and pretreat magnetic beads until the pH value of a leaching solution is neutral, transferring an obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:9-11, adding chitosan aqueous solution, silane coupling agent and Span-80, stirring for 18-24 hours at 70-90 ℃, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreat magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g: 100-300 mL:0.1 to 0.2g: 2.5-5 mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:4-6, adding a high molecular crosslinking agent, stirring and mixing for 8-10 h at 70-80 ℃ and 750-800 rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the high molecular crosslinking agent is 1-5: 1:0.05 to 0.2.
In the step (a), the alkaline solution is sodium hydroxide solution with a pH value of 9-11.
In step (b), the concentration of the aqueous chitosan solution was 0.5wt%.
In the step (c), the polymer cross-linking agent is any one of polysuccinimide and sodium polyphosphate.
The stirring device comprises a tank body, a central shaft which is driven to rotate by a motor, a rotating shaft which is circumferentially distributed on the outer ring of the central shaft, a first stirring paddle which is circumferentially distributed on the outer ring of the rotating shaft, and a second stirring paddle which is transversely and rotatably installed in the lower part of the tank body, wherein a first gear is fixedly installed on the central shaft, a second gear meshed with the first gear is circumferentially and uniformly distributed on the periphery of the first gear, the rotating shaft is fixedly arranged on the second gear in a penetrating manner, a connecting plate and a partition plate are fixedly installed on the upper part of the tank body, a sliding block which is circumferentially and uniformly distributed is slidingly connected on the connecting plate, column holes are uniformly distributed on the inner circumference of the partition plate, a sliding rod is slidably embedded in the column holes, the upper end of the first stirring paddle is rotatably connected with the sliding block, the first stirring paddle penetrates through the partition plate and the sliding rod, the first stirring paddle is rotatably connected with the sliding rod, a first eccentric gear is fixedly installed on the rotating shaft, a second eccentric gear meshed with the first eccentric gear is fixedly installed on the first stirring paddle, the rotating shaft is rotatably arranged on the side of the inner and outer end of the second stirring paddle, a spring is arranged between the outer end of the sliding rod and the column hole, and the first stirring paddle moves outwards, and the central shaft penetrates the central shaft to the compression body vertically and stretches into the second stirring paddle.
The connecting plate is provided with sliding grooves uniformly distributed on the circumference, the groove wall protrusions of the sliding grooves form a pair of sliding rails, and the sliding blocks are correspondingly embedded into the sliding grooves and are in sliding connection with the pair of sliding rails.
The baffle upper surface is sunken to form the through groove of circumference equipartition, through groove and the perpendicular intercommunication of post hole one-to-one, the slide bar slides along post Kong Laihui and the slide bar will run through the groove completely throughout, first stirring rake passes through the through groove and runs through inslot round trip movement.
The lower part of the tank body is fixedly provided with a cylinder column, the central shaft extends into the cylinder column and is rotationally connected with the cylinder column, the second stirring paddles vertically penetrate through the cylinder column and are rotationally connected with the cylinder column, the lower end of the central shaft is in meshed transmission connection with the second stirring paddles through a pair of bevel gears, and the bevel gears are arranged in the cylinder column.
The rotating shaft is rotatably arranged between the connecting plate and the partition plate.
The beneficial effects of the invention are as follows: (1) The prepared composite adsorbent has magnetism and is loaded with active carbon, and can effectively adsorb soil pollutants, and has high adsorption efficiency and strong adsorption capacity; (2) The composite adsorbent can be recycled after adsorbing soil pollutants, so that the pollutants are separated from the soil, the risk of soil recontamination caused by leakage of the pollutants or residue of degradation products in the traditional soil restoration agent is avoided, the composite adsorbent is recycled after desorption, and the soil restoration cost is reduced; (3) Each first stirring paddle carries out inside and outside round trip movement stirring, and simultaneously the second stirring paddle carries out horizontal stirring in jar body lower part, can effectively improve dispersibility and mobility and the heated homogeneity when magnetic bead and chitosan coupling, prevents that the magnetic bead from agglomerating, promotes going on of coupling process, and then improves the homogeneity of modified magnetic bead granule size to can promote the even cladding of chitosan to the magnetic bead, guarantee the magnetism correspondence of modified magnetic bead, thereby ensure the adsorption effect of final product.
Drawings
FIG. 1 is a schematic structural view of a stirring device according to the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is an enlarged view at B in FIG. 1;
FIG. 4 is a schematic perspective view of a connection plate of the stirring device of the present invention;
FIG. 5 is a schematic view of the structure of a partition plate of the stirring device of the present invention;
fig. 6 is a cross-sectional view taken along the direction C-C in fig. 5.
In the figure: the tank 1, the cylinder 11, the central shaft 2, the first gear 21, the bevel gear 22, the motor 23, the rotating shaft 3, the second gear 31, the first eccentric gear 32, the first eccentric gear 33, the first stirring paddle 4, the second eccentric gear 41, the second eccentric gear 42, the second stirring paddle 5, the connecting plate 6, the sliding chute 61, the sliding rail 62, the convex ring 63, the partition 7, the cylinder hole 71, the through slot 72, the sealing plate 73, the sliding block 8, the sliding rod 9 and the spring 91.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
example 1
The preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then soaking the magnetic beads in sodium hydroxide solution with pH value of 9 for 4 hours to obtain pretreated magnetic beads;
(b) Washing the pretreated magnetic beads by deionized water until the pH value of the leaching solution is neutral, transferring the obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:9, adding chitosan aqueous solution with the concentration of 0.5wt%, silane coupling agent and Span-80, stirring at 70 ℃ for 24 hours, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreated magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g:100mL:0.12g:3mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:5, adding a macromolecular crosslinking agent, namely polysuccinimide, stirring and mixing for 10 hours at 80 ℃ and 800rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the polysuccinimide is 1:1:0.07.
as shown in fig. 1 to 6, the stirring device comprises a tank body 1, a central shaft 2 driven to rotate by a motor 23, a rotating shaft 3 circumferentially distributed on the outer ring of the central shaft 2, a first stirring paddle 4 circumferentially distributed on the outer ring of the rotating shaft 3, and a second stirring paddle 5 transversely rotatably installed in the lower part of the tank body 1, wherein a first gear 21 is fixedly installed on the central shaft 2, second gears 31 meshed with the first gear 21 are uniformly distributed on the periphery and circumference of the first gear 21, the rotating shaft 3 is fixedly arranged on the second gears 31 in a penetrating manner, and the first gears 21 are simultaneously meshed and in transmission connection with a plurality of second gears 31, so that a plurality of rotating shafts 3 are driven to rotate simultaneously.
The upper part of the tank body 1 is internally and fixedly provided with a connecting plate 6 and a baffle plate 7, the rotating shaft 3 is rotatably arranged between the connecting plate 6 and the baffle plate 7, the connecting plate 6 is slidably connected with a sliding block 8 with uniformly distributed circumference, the inner circumference of the baffle plate 7 is uniformly distributed with a column hole 71, a sliding rod 9 is embedded in the column hole 71 in a sliding way, a spring 91 is arranged between the outer end of the sliding rod 9 and the column hole 71, the upper end of the first stirring paddle 4 is rotatably connected with the sliding block 8, the first stirring paddle 4 passes through the baffle plate 7 and the sliding rod 9 and is rotatably connected with the sliding rod 9, a first eccentric gear 32 is fixedly arranged on the rotating shaft 3, a second eccentric gear 41 meshed with the first eccentric gear 32 is fixedly arranged on the first stirring paddle 4, the rotating shaft 3 drives the first stirring paddle 4 to rotate and move inside and outside, and back and forth when the first stirring paddle 4 moves outwards, the sliding rod 9 compresses the spring 91; when the first stirring paddle 4 moves outwards to the outermost end, the meshing transmission effect between the first eccentric gear 32 and the second eccentric gear 41 is lost, and through the arrangement of the spring 91, the spring 91 is in a compressed state when the first stirring paddle 4 moves outwards to the outermost end, and the elastic force of the spring 91 is utilized to apply an inward thrust to the sliding rod 9, so that the first eccentric gear 32 and the second eccentric gear 41 can be always meshed, and the central shaft 2 can drive the first stirring paddle 4 to rotate and move in an internal-external translational mode.
The rotating shaft 3 is also fixedly provided with a first eccentric wheel 33, the first stirring paddle 4 is also fixedly provided with a second eccentric wheel 42, and the first eccentric wheel 33 is in rolling butt connection with the second eccentric wheel 42, so that the first stirring paddle 4 runs more smoothly and stably. In order to facilitate the installation of the slide bar 9 and the spring 91, the annular outer wall of the partition plate 7 is recessed to form circular holes distributed circumferentially, after the slide bar 9 and the spring 91 are placed in the partition plate, the outer open ends of the circular holes are covered by the sealing plate 73 and the sealing plate 73 is fixedly connected with the partition plate 7, and in practice, the column holes 71 are formed by combining the circular holes with the sealing plate 73.
The central shaft 2 penetrates through the partition 7 to extend into the lower part of the tank body 1, the central shaft 2 is in vertical transmission connection with the second stirring paddle 5, in fact, the central shaft 2 sequentially penetrates through the connecting plate 6 and the partition 7, and the central shaft 2 is in rotary connection with the partition 7. The specific transmission mounting structure of the central shaft 2 and the second stirring paddle 5 is as follows: the lower part of the tank body 1 is fixedly provided with a cylinder 11, the central shaft 2 stretches into the cylinder 11 and is rotationally connected with the cylinder 11, the second stirring paddles 5 vertically penetrate through the cylinder 11 and are rotationally connected with the cylinder 11, the lower end of the central shaft 2 is in meshed transmission connection with the second stirring paddles 5 through a pair of bevel gears 22, and the bevel gears 22 are arranged in the cylinder 11. The cylinder 11 is formed by combining an upper part and a lower part, the cross section of the upper part of the cylinder 11 is more than a semicircular ring, the cross section of the lower part of the cylinder 11 is less than a semicircular ring, the upper part and the lower part of the cylinder 11 are sealed by sealing rings, the central shaft 2 and the second stirring paddles 5 are connected with the upper part of the cylinder 11, the installation of the central shaft 2 and the second stirring paddles 5 is convenient due to the arrangement of the structure of the cylinder 11, a pair of bevel gears 22 can be protected, and the raw materials are prevented from influencing the operation of the pair of bevel gears 22.
The connecting plate 6 is provided with sliding grooves 61 uniformly distributed on the circumference, the groove walls of the sliding grooves 61 are protruded to form a pair of sliding rails 62, the sliding blocks 8 are correspondingly embedded into the sliding grooves 61, and the sliding blocks 8 are in sliding connection with the pair of sliding rails 62. The sliding groove 61 is of a structure which is penetrated up and down and is provided with an opening at the outer end, so that the sliding block 8 is convenient to install; the sliding rail 62 is arranged to limit the sliding block 8 up and down, so that the movement of the first stirring paddle 4 is stably guided; the protruding bulge loop 63 that forms in connecting plate 6 upper surface edge, bulge loop 63 and jar body 1 top fixed connection, the setting of bulge loop 63 makes the main part of connecting plate 6 and jar body 1 top leave the clearance on the one hand, guarantees the smooth and easy of first stirring rake 4 rotation and back and forth movement, on the other hand has connected the opening of spout 61 outer end, has guaranteed the structural stability of spout 61.
The upper surface of the partition plate 7 is recessed to form penetrating grooves 72 uniformly distributed in the circumference, the penetrating grooves 72 are vertically communicated with the column holes 71 in a one-to-one correspondence mode, the sliding rods 9 slide back and forth along the column holes 71, the penetrating grooves 72 are completely separated by the sliding rods 9 all the time, and the first stirring paddles 4 penetrate through the penetrating grooves 72 and move back and forth in the penetrating grooves 72. The post hole 71 is cylindrical, and defines a length direction of the through slot 72 along a length direction of the slide bar 9, and a width of the through slot 72 is smaller than a diameter of the post hole 71, so that the slide bar 9 can completely block the through slot 72. The tank body 1 is divided into an upper cavity and a lower cavity by the partition plate 7, the first gear 21, the second gear 31, the first eccentric gear 32, the first eccentric gear 33, the second eccentric gear 41 and the second eccentric gear 42 are all arranged in the upper cavity, and the through groove 72 is completely blocked by the slide rod 9, so that materials can be prevented from entering the upper cavity, and the normal operation of equipment is not influenced; the roof of the tank body 1 is detachably arranged, so that the installation and maintenance of components such as the rotating shaft 3, the first gear 21, the second gear 31, the first eccentric gear 32, the first eccentric wheel 33, the second eccentric gear 41, the second eccentric wheel 42 and the like are facilitated.
The working process of the stirring device of the invention is as follows: the motor 23 drives the central shaft 2 to rotate, the first gear 21 drives each second gear 31 to rotate, the second gears 31 drive the corresponding rotating shafts 3 to rotate, the rotating shafts 3 drive the first stirring paddles 4 to rotate and move back and forth simultaneously through the first eccentric gears 32, the second eccentric gears 41 and the first eccentric gears 32 and the second eccentric gears 42, namely the first stirring paddles 4 rotate and translate back and forth to stir, and meanwhile, the central shaft 2 drives the second stirring paddles 5 to rotate, so that stirring effect is improved.
Example 2
The preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then immersing the magnetic beads in sodium hydroxide solution with pH value of 11 for 2 hours to obtain pretreated magnetic beads;
(b) The preparation method comprises the steps of adopting deionized water to wash and pretreat magnetic beads until the pH value of a leaching solution is neutral, transferring an obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:9, adding chitosan aqueous solution with the concentration of 0.5wt%, silane coupling agent and Span-80, stirring at 80 ℃ for 24 hours, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreat magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g: 300mL:0.15g:4mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:4, adding a high molecular crosslinking agent sodium polyphosphate, stirring and mixing for 10 hours at 75 ℃ and 750rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the sodium polyphosphate is 5:1:0.1.
example 3
The preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then soaking the magnetic beads in sodium hydroxide solution with pH value of 9 for 5 hours to obtain pretreated magnetic beads;
(b) Washing the pretreated magnetic beads by deionized water until the pH value of the leaching solution is neutral, transferring the obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:11, adding chitosan aqueous solution with the concentration of 0.5wt%, silane coupling agent and Span-80, stirring for 20 hours at 90 ℃, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreated magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g:200mL:0.1g:3mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:6, adding a macromolecular crosslinking agent, namely polysuccinimide, stirring and mixing for 9 hours at 75 ℃ and 800rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the polysuccinimide is 2:1:0.05.
example 4
The preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then soaking the magnetic beads in sodium hydroxide solution with pH value of 10 for 4 hours to obtain pretreated magnetic beads;
(b) The preparation method comprises the steps of adopting deionized water to wash and pretreat magnetic beads until the pH value of a leaching solution is neutral, transferring an obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:10, adding chitosan aqueous solution with the concentration of 0.5wt%, silane coupling agent and Span-80, stirring for 18h at 90 ℃, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreat magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g:260mL:0.2g:4mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:5, adding a high molecular crosslinking agent sodium polyphosphate, stirring and mixing for 8 hours at 75 ℃ and 800rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the sodium polyphosphate is 3:1:0.2.
example 5
The preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then immersing the magnetic beads in sodium hydroxide solution with pH value of 11 for 2 hours to obtain pretreated magnetic beads;
(b) The preparation method comprises the steps of adopting deionized water to wash and pretreat magnetic beads until the pH value of a leaching solution is neutral, transferring an obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:9, adding chitosan aqueous solution with the concentration of 0.5wt%, silane coupling agent and Span-80, stirring at 80 ℃ for 24 hours, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreat magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g:200mL:0.18g:5mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:5, adding a high molecular crosslinking agent sodium polyphosphate, stirring and mixing for 8 hours at 80 ℃ and 750rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the sodium polyphosphate is 2:1:0.15.
example 6
The preparation method of the fly ash magnetic bead-activated carbon composite adsorbent comprises the following steps:
(a) Screening out magnetic beads with magnetic induction intensity of 100-300 mt from the fly ash by using a magnetic separator, and then soaking the magnetic beads in sodium hydroxide solution with pH value of 9 for 3 hours to obtain pretreated magnetic beads;
(b) Washing the pretreated magnetic beads by deionized water until the pH value of the leaching solution is neutral, transferring the obtained mixed system into a stirring device, adding deionized water to adjust the mass solid-liquid ratio of the magnetic bead mixed solution to 1:10, adding chitosan aqueous solution with the concentration of 0.5wt%, silane coupling agent and Span-80, stirring for 18h at 70 ℃, and separating to obtain modified magnetic beads, wherein the dosage ratio of the pretreated magnetic beads to the chitosan aqueous solution, the silane coupling agent and the Span-80 is 10g:220mL:0.11g:2.5mL;
(c) Placing the modified magnetic beads and the activated carbon in a mixer, adding deionized water, controlling the mass-to-solid ratio of a mixed system to be 1:4, adding a macromolecular crosslinking agent, namely polysuccinimide, stirring and mixing for 10 hours at 70 ℃ and 800rpm, and filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent, wherein the mass ratio of the modified magnetic beads to the activated carbon to the polysuccinimide is 4:1:0.15.
the composite adsorbents prepared in examples 1-6 are used for repairing heavy metal and organic matter contaminated soil, the heavy metal and organic matter content in the repaired soil is analyzed, and the removal rates of the heavy metal, 91.5%, 90%, 92.1%, 90.8% and 92.7% are calculated, and the removal rates of the organic matter, 94.5%, 92.6%, 91.4%, 93.7%, 91.3% and 93.1% are calculated.
Comparative examples 1 to 6
The composite adsorbent is prepared according to the methods and proportions of examples 1-6, except that in step (b), the conventional stirring device is used for stirring, the obtained composite adsorbent is also used for repairing heavy metal and organic matter polluted soil, the contents of heavy metal and organic matter in the repaired soil are analyzed, and the removal rates of the heavy metal are calculated to be 85.2%, 84.7%, 84.1%, 83.5%, 84.2% and 85.3% respectively, and the removal rates of the organic matter are calculated to be 86.7%, 84.1%, 82.4%, 82.9%, 83.6% and 85.5% respectively, so that the improved stirring device can effectively improve the repairing effect of the soil repairing agent.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The utility model provides a stirring device of preparation fly ash magnetic bead-active carbon composite adsorbent, includes jar body (1), through center pin (2) of motor (23) drive rotation, circumference distribute in pivot (3) of center pin (2) outer lane, circumference distribute in first stirring rake (4) of pivot (3) outer lane, transversely rotate second stirring rake (5) of installing in jar body (1) lower part, its characterized in that: the utility model discloses a jar, including center pin (2) and baffle (7), the center pin (2) is gone up to solid first gear (21), the peripheral circumference equipartition of first gear (21) and second gear (31) of first gear (21) meshing, fixed wearing establishes pivot (3) on second gear (31), fixed connecting plate (6) and baffle (7) of being equipped with in jar body (1) upper portion, sliding connection has slider (8) of circumference equipartition on connecting plate (6), first stirring rake (4) upper end and slider (8) rotate to be connected, column hole (71) are equipped with to baffle (7) inner circumference equipartition, the interior slip of column hole (71) is inlayed and is equipped with slide bar (9), be equipped with spring (91) between slide bar (9) outer end and column hole (71), first stirring rake (4) pass baffle (7) and slide bar (9) and first stirring rake (7) are rotated and are connected, the concave through groove (72) that forms of circumference equipartition on baffle (7), through groove (72) and column hole (71) are corresponding one by one and slide bar (72) are all the time passed through along slide bar (9) completely, the first stirring paddle (4) passes through the through groove (72) and moves back and forth in the through groove (72); the novel stirring device is characterized in that a first eccentric gear (32) is fixedly arranged on the rotating shaft (3), a second eccentric gear (41) meshed with the first eccentric gear (32) is fixedly arranged on the first stirring paddle (4), the rotating shaft (3) drives the first stirring paddle (4) to rotate while making internal and external movements, the sliding rod (9) compresses a spring (91) when the first stirring paddle (4) moves outwards, the central shaft (2) penetrates through the partition plate (7) to extend into the lower part of the tank body (1) and is in vertical transmission connection with the second stirring paddle (5), a cylindrical column (11) is fixedly arranged in the lower part of the tank body (1), the central shaft (2) extends into the cylindrical column (11) and is in rotary connection with the cylindrical column (11), the second stirring paddle (5) vertically penetrates through the cylindrical column (11) and is in rotary connection with the cylindrical column (11), and the lower end of the central shaft (2) is in transmission connection with the second stirring paddle (5) through a pair of bevel gears (22), and a pair of bevel gears (22) are arranged in the cylindrical column (11).
2. The stirring device for preparing the fly ash magnetic bead-activated carbon composite adsorbent according to claim 1, wherein: the connecting plate (6) is provided with sliding grooves (61) uniformly distributed in the circumference, a pair of sliding rails (62) are formed by protruding the groove walls of the sliding grooves (61), the sliding blocks (8) are correspondingly embedded into the sliding grooves (61), and the sliding blocks (8) are in sliding connection with the pair of sliding rails (62).
3. The stirring device for preparing the fly ash magnetic bead-activated carbon composite adsorbent according to claim 1, wherein: the rotating shaft (3) is rotatably arranged between the connecting plate (6) and the partition plate (7).
4. The stirring device for preparing the fly ash magnetic bead-activated carbon composite adsorbent according to claim 1, wherein: the rotary shaft (3) is fixedly provided with a first eccentric wheel (33), the first stirring paddle (4) is fixedly provided with a second eccentric wheel (42), and the first eccentric wheel (33) is in rolling butt connection with the second eccentric wheel (42).
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