Water pollution treatment equipment and method for preparing nano-silicon dioxide from silicon-containing waste materials

Abstract

The application provides a water pollution treatment equipment and a method for preparing nano silicon dioxide from silicon-containing waste materials. The application relates to the field of water pollution treatment, and the water pollution treatment equipment comprises a treatment tank, and a sewage pipe is communicated with one side of the treatment tank. The water pollution treatment equipment and the method for preparing nano silicon dioxide from silicon-containing waste materials have the advantages that sewage is input through the sewage pipe, calcium oxide is put into a feeding port for reaction, an inner stirring blade is driven by a stirring motor to mix in the horizontal direction, after the rotation speed is increased, an outer stirring blade is extended, a vertical stirring blade is used to fully mix the mixed slurry, the stirring radius is increased, the mixing is strengthened, dead angles are avoided, the agglomeration of the incompletely reacted precipitates is broken, accumulation is prevented, the reaction efficiency and completeness are improved, the outer stirring blade is automatically reset by a stirring spring after shutdown, and the sodium hydroxide solution is recycled and the calcium carbonate is recycled by a solid-liquid separator, so that the sewage is treated in an environmentally friendly manner and is recycled.

Description

Technical Field

[0001] This invention relates to the field of water pollution treatment, and more particularly to a water pollution treatment device and a method for preparing nano-silica from silicon-containing waste. Background Technology

[0002] The production process of nano-silica generates wastewater rich in sodium carbonate. Direct discharge of this wastewater can lead to water pollution. Untreated wastewater discharged directly into natural water bodies can cause eutrophication, ecological imbalance, and the formation of black and odorous water bodies. Chemical substances can also directly threaten human health and drinking water safety through the food chain.

[0003] Existing water pollution treatment equipment treats wastewater rich in sodium carbonate by adding calcium oxide for reaction and stirring. After the reaction, the mixed slurry is separated into solid and liquid components by a separator, ultimately achieving harmless treatment of wastewater to obtain calcium carbonate precipitate and sodium hydroxide solution.

[0004] However, in existing water pollution treatment equipment, when wastewater is added to calcium oxide and stirred, the stirring alone will lead to incomplete mixing of the slurry. As the reaction time continues, the slurry agglomerates and produces large pieces of unreacted precipitate.

[0005] Therefore, it is necessary to provide a water pollution treatment device and a method for preparing nano-silica from silicon-containing waste to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a water pollution treatment device and a method for preparing nano-silica from silicon-containing waste, which solves the problem of slurry agglomeration producing large, incompletely reacted precipitates.

[0007] To solve the above-mentioned technical problems, the present invention provides a water pollution treatment device, comprising: a treatment tank, one side of which is connected to a sewage pipe;

[0008] A stirring mechanism is fixedly installed at the bottom of the processing tank via a bracket. The stirring mechanism includes a stirring motor, which is fixedly installed at the bottom of the processing tank via a bracket. The output shaft of the stirring motor is fixedly connected to a stirring shaft. The top end of the stirring shaft penetrates the bottom of the processing tank and extends into the interior. Three sets of inner stirring blades are fixedly installed on the surface of the stirring shaft inside the processing tank via three fixing rings. One end of each of the three sets of inner stirring blades is fixedly connected to an outer stirring blade via a stirring spring. Four vertical stirring blades are symmetrically fixedly installed on both sides of the outer stirring blades.

[0009] An extraction mechanism for extracting the mixed slurry;

[0010] A solid-liquid separator, used for solid-liquid separation of extracted mixed slurry;

[0011] Feed port, which is connected to the top of the processing tank.

[0012] Preferably, the extraction mechanism is connected to the bottom of the processing tank. The extraction mechanism includes an extraction pipe connected to the bottom of the processing tank. The end of the extraction pipe is connected to an extraction pump. The output end of the extraction pump is connected to the feed end of the solid-liquid separator through a connecting pipe.

[0013] Preferably, a lifting mechanism is fixedly installed on the inner wall of the treatment tank. The lifting mechanism includes a fixed plate, which is fixedly installed on the inner wall of the treatment tank. A lifting plate is fixedly connected to the bottom of the fixed plate by a lifting spring. A telescopic sleeve communicates between the fixed plate and the lifting plate. Several ventilation holes are opened inside the lifting plate. Two round holes are opened inside both the fixed plate and the lifting plate.

[0014] Preferably, two float mechanisms are slidably installed inside the four circular holes respectively. Each float mechanism includes a float column, which is slidably installed inside two of the circular holes. A float is fixedly installed at the bottom end of the float column. A first ring and a second ring are fixedly installed on the surface of the float column respectively. A disk is fixedly installed at the top end of the float column. An extension column is fixedly installed at the top of the disk. A pawl is fixedly installed on one side of one of the disks via a connecting rod.

[0015] Preferably, a dosing mechanism is fixedly installed on the inner wall of the treatment tank. The dosing mechanism includes a medicine box, which is fixedly installed on the inner wall of the treatment tank. A dosing tube is connected to the bottom of the medicine box. A dosing shaft is rotatably installed on the inner wall of the dosing tube. Both ends of the dosing shaft penetrate the inner wall of the dosing tube and extend to the outside. A dosing plate is fixedly installed on the surface of the dosing shaft inside the dosing tube. A ratchet is fixedly installed on the end of the dosing shaft outside the dosing tube. The pawl engages with the ratchet.

[0016] Preferably, one side of the dosing pipe is connected to a bellows mechanism, the bellows mechanism includes an air supply pipe connected to one side of the dosing pipe, one end of the air supply pipe penetrates the inner wall of the treatment tank and extends to the outside, the end of the air supply pipe located outside the treatment tank is connected to a bellows, one side of the bellows is fixedly installed to one side of the treatment tank by a fixing bracket, and a bellows pusher plate is slidably installed inside the bellows.

[0017] Preferably, the outer wall of the treatment tank is connected to a recycling mechanism, which includes a recycling pipe and a cleaning pipe. The recycling pipe is connected to the outer wall of the treatment tank, and the bottom of the recycling pipe is connected to the recycling tank via a water supply pipe. One end of the cleaning pipe passes through one side of the treatment tank and extends into the interior of the recycling tank. The end of the cleaning pipe located inside the recycling tank is connected to a submersible pump inside the recycling tank.

[0018] Preferably, four drive mechanisms are fixedly installed on the top of the lifting plate, with each pair of drive mechanisms being adapted to each other. Each drive mechanism includes a cylinder and a connecting plate. The cylinder is fixedly installed on the top of the lifting plate, and a bearing block is fixedly connected to the output end of the cylinder. The connecting plate is fixedly installed on the top of the lifting plate, and the connecting plate is slidably installed with the bearing block. Each pair of bearing blocks is adapted to each other, and each pair of bearing blocks is adapted to the circular hole.

[0019] Preferably, the bottom of the treatment tank is connected to an vent pipe, two symmetrical sliding grooves are opened on one side of the treatment tank, two drive columns are fixedly installed on the top of the lifting plate, the two drive columns are adapted to the two sliding grooves, the two drive columns are fixedly installed on the bottom of the bellows push plate, baffles are fixedly installed on the surface of the two drive columns, the two baffles are adapted to the two sliding grooves, a switch is fixedly installed at the bottom of the medicine box, and the extension column is adapted to the switch.

[0020] Compared with related technologies, the water pollution treatment equipment provided by the present invention has the following beneficial effects:

[0021] This invention provides a water pollution treatment device. Wastewater is input through a sewage pipe, and calcium oxide is added to the feed inlet for reaction. The stirring motor is started, driving the inner stirring blades to mix horizontally. As the speed increases, the outer stirring blades extend, and the vertical stirring blades thoroughly mix the slurry. This increases the stirring radius, strengthens the mixing, avoids dead zones, and breaks up clumps of incompletely reacted precipitates to prevent accumulation, thus improving reaction efficiency and completeness. The stirring spring automatically resets the outer stirring blades after the machine stops. A solid-liquid separator enables the recycling of sodium hydroxide solution and the recovery of calcium carbonate, achieving environmentally friendly wastewater treatment and resource utilization. Attached Figure Description

[0022] Figure 1 A schematic diagram of a preferred embodiment of a water pollution treatment device provided by the present invention;

[0023] Figure 2 Another structural schematic diagram of a preferred embodiment of a water pollution treatment device;

[0024] Figure 3 for Figure 2 The diagram shows the structure of the stirring mechanism.

[0025] Figure 4 for Figure 2 The diagram shows the structure of the extraction mechanism;

[0026] Figure 5 A schematic diagram of the structure of a second embodiment of a water pollution treatment device;

[0027] Figure 6 Another structural schematic diagram of a second embodiment of a water pollution treatment device;

[0028] Figure 7 for Figure 5 The diagram shows the structure of the lifting mechanism.

[0029] Figure 8 for Figure 5 The diagram shown is a structural schematic of the float mechanism.

[0030] Figure 9 for Figure 5 The diagram shown is a structural schematic of the drug delivery mechanism.

[0031] Figure 10 for Figure 6 The diagram shows the structure of the bellows mechanism.

[0032] Figure 11 for Figure 5 The diagram shown illustrates the structure of the recycling mechanism.

[0033] Figure 12 for Figure 5 The diagram shows the structure of the drive mechanism.

[0034] Figure 13 for Figure 5 The diagram shows the installation of the switch.

[0035] Numbered in the diagram: 1. Processing tank; 2. Stirring mechanism; 201. Stirring motor; 202. Stirring shaft; 203. Inner stirring blade; 204. Stirring spring; 205. Outer stirring blade; 206. Vertical stirring blade; 3. Extraction mechanism; 301. Extraction pipe; 302. Extraction pump; 303. Connecting pipe; 4. Solid-liquid separator; 5. Lifting mechanism; 501. Fixed plate; 502. Lifting spring; 503. Lifting plate; 504. Telescopic sleeve; 505. Vent hole; 506. Circular hole; 6. Float mechanism; 601. Float column; 602. Float; 603. First ring; 604. Second ring; 605. Circular hole. 606. Plate, extension column, 607. Pawl, 7. Dosing mechanism, 701. Medicine box, 702. Dosing pipe, 703. Dosing shaft, 704. Dosing plate, 705. Ratchet, 8. Bellows mechanism, 801. Air supply pipe, 802. Bellows, 803. Bellows push plate, 9. Recovery mechanism, 901. Recovery pipe, 902. Water supply pipe, 903. Recovery tank, 904. Cleaning pipe, 10. Drive mechanism, 1001. Cylinder, 1002. Bearing block, 1003. Connecting plate, 11. Feed port, 12. Drain pipe, 13. Drive column, 14. Baffle, 15. Slide, 16. Switch, 17. Sewage pipe. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] A water pollution treatment device

[0038] First Embodiment

[0039] Please refer to the following: Figure 1 , Figure 2 , Figure 3 and Figure 4 A water pollution treatment device includes: a treatment tank 1, one side of which is connected to a sewage pipe 17;

[0040] A stirring mechanism 2 is fixedly installed at the bottom of the processing tank 1 by a bracket. The stirring mechanism 2 includes a stirring motor 201, which is fixedly installed at the bottom of the processing tank 1 by a bracket. The output shaft of the stirring motor 201 is fixedly connected to a stirring shaft 202. The top end of the stirring shaft 202 penetrates the bottom of the processing tank 1 and extends into the interior. Three sets of inner stirring blades 203 are fixedly installed on the surface of the stirring shaft 202 inside the processing tank 1 by three fixing rings. One end of each of the three sets of inner stirring blades 203 is fixedly connected to an outer stirring blade 205 by a stirring spring 204. Four vertical stirring blades 206 are symmetrically fixedly installed on both sides of the outer stirring blades 205.

[0041] Extraction mechanism 3, which is used to extract the mixed slurry;

[0042] Solid-liquid separator 4, which is used to separate the solid and liquid components of the extracted mixed slurry;

[0043] Feed port 11, which is connected to the top of the processing tank 1.

[0044] The extraction mechanism 3 is connected to the bottom of the processing tank 1. The extraction mechanism 3 includes an extraction pipe 301, which is connected to the bottom of the processing tank 1. The end of the extraction pipe 301 is connected to an extraction pump 302. The output end of the extraction pump 302 is connected to the feed end of the solid-liquid separator 4 through a connecting pipe 303.

[0045] In actual use, one set of the inner stirring blades 203 is provided with four blades, and the three sets of inner stirring blades 203 are staggered; the sewage pipe 17 receives the sewage collection device and pumps it into the interior of the treatment tank 1.

[0046] The working principle of the water pollution treatment equipment provided by this invention is as follows:

[0047] First, the filtered wastewater is discharged into the treatment tank 1 through the wastewater pipe 17. Once the corresponding liquid level is reached, the wastewater input is stopped, and a fixed amount of calcium oxide is manually added through the feeding port 11.

[0048] Then, the stirring motor 201 is started. The stirring motor 201 drives several inner stirring blades 203 to rotate through the stirring shaft 202. During the mixing process of the slurry, as the speed of the stirring motor 201 increases, the centrifugal force on the outer stirring blade 205 is greater than the tension of the stirring spring 204. Therefore, the outer stirring blade 205 drives the vertical stirring blade 206 to move in the horizontal direction and fully mix the slurry. At the same time, the moving vertical stirring blade 206 breaks up the sediment that has not fully reacted in the vertical agglomeration, so that it can react fully. After the process is completed, the stirring motor 201 stops rotating, and the stirring spring 204 drives the outer stirring blade 205 to automatically reset.

[0049] Finally, the extraction pump 302 is started to extract the mixed slurry through the extraction pipe 301 and pump it into the solid-liquid separator 4 through the connecting pipe 303. Through solid-liquid separation, calcium carbonate precipitate and sodium hydroxide solution are obtained. The sodium hydroxide solution is recycled to dissolve silicon-containing waste, and calcium carbonate can be used as a by-product in the paper and coating industries or recycled by calcination to recover carbon dioxide and calcium oxide.

[0050] Compared with related technologies, the water pollution treatment equipment provided by the present invention has the following beneficial effects:

[0051] Wastewater is input through the wastewater pipe 17, and calcium oxide is added to the feed port 11 for reaction. The stirring motor 201 is started to drive the inner stirring blade 203 to mix in the horizontal direction. As the speed increases, the outer stirring blade 205 extends, and at the same time, the vertical stirring blade 206 fully mixes the slurry. This increases the stirring radius and strengthens the mixing to avoid dead corners. It can also break up the clumps of incompletely reacted precipitates to prevent accumulation, thereby improving the reaction efficiency and completeness. The stirring spring 204 causes the outer stirring blade 205 to automatically reset after the machine stops. The sodium hydroxide solution is recycled and the calcium carbonate is recovered through the solid-liquid separator 4, realizing environmentally friendly wastewater treatment and resource utilization.

[0052] Second Embodiment

[0053] Please refer to the following: Figures 5-13 Based on the water pollution treatment device provided in the first embodiment of this application, the second embodiment of this application proposes another water pollution treatment device. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0054] Specifically, the water pollution treatment equipment provided in the second embodiment of this application differs in that a lifting mechanism 5 is fixedly installed on the inner wall of the treatment tank 1. The lifting mechanism 5 includes a fixed plate 501, which is fixedly installed on the inner wall of the treatment tank 1. A lifting plate 503 is fixedly connected to the bottom of the fixed plate 501 through a lifting spring 502. A telescopic sleeve 504 communicates between the fixed plate 501 and the lifting plate 503. Several ventilation holes 505 are opened inside the lifting plate 503. Two round holes 506 are opened inside both the fixed plate 501 and the lifting plate 503.

[0055] Two float mechanisms 6 are slidably installed inside the four circular holes 506 respectively. Each float mechanism 6 includes a float column 601, which is slidably installed inside the two circular holes 506. A float 602 is fixedly installed at the bottom end of the float column 601. A first ring 603 and a second ring 604 are fixedly installed on the surface of the float column 601 respectively. A disk 605 is fixedly installed at the top end of the float column 601. An extension column 606 is fixedly installed at the top of the disk 605. A pawl 607 is fixedly installed on one side of one of the disks 605 via a connecting rod.

[0056] A dosing mechanism 7 is fixedly installed on the inner wall of the treatment tank 1. The dosing mechanism 7 includes a medicine box 701, which is fixedly installed on the inner wall of the treatment tank 1. The bottom of the medicine box 701 is connected to a dosing tube 702. A dosing shaft 703 is rotatably installed on the inner wall of the dosing tube 702. Both ends of the dosing shaft 703 penetrate the inner wall of the dosing tube 702 and extend to the outside. A dosing plate 704 is fixedly installed on the surface of the dosing shaft 703 inside the dosing tube 702. A ratchet 705 is fixedly installed on one end of the dosing shaft 703 outside the dosing tube 702. A pawl 607 engages with the ratchet 705.

[0057] One side of the dosing pipe 702 is connected to a bellows mechanism 8. The bellows mechanism 8 includes an air supply pipe 801, which is connected to one side of the dosing pipe 702. One end of the air supply pipe 801 penetrates the inner wall of the treatment tank 1 and extends to the outside. The end of the air supply pipe 801 located outside the treatment tank 1 is connected to a bellows 802. One side of the bellows 802 is fixedly installed on one side of the treatment tank 1 by a fixing bracket. A bellows pusher plate 803 is slidably installed inside the bellows 802.

[0058] The outer wall of the treatment tank 1 is connected to a recycling mechanism 9. The recycling mechanism 9 includes a recycling pipe 901 and a cleaning pipe 904. The recycling pipe 901 is connected to the outer wall of the treatment tank 1. The bottom of the recycling pipe 901 is connected to the recycling tank 903 through a water supply pipe 902. One end of the cleaning pipe 904 passes through one side of the treatment tank 1 and extends into the interior of the recycling tank 903. The end of the cleaning pipe 904 located inside the recycling tank 903 is connected to a submersible pump inside the recycling tank 903.

[0059] Four drive mechanisms 10 are fixedly installed on the top of the lifting plate 503. Each pair of drive mechanisms 10 is adapted to each other. Each drive mechanism 10 includes a cylinder 1001 and a connecting plate 1003. The cylinder 1001 is fixedly installed on the top of the lifting plate 503. The output end of the cylinder 1001 is fixedly connected to a bearing block 1002. The connecting plate 1003 is fixedly installed on the top of the lifting plate 503. The connecting plate 1003 and the bearing block 1002 are slidably installed. Each pair of bearing blocks 1002 is adapted to each other and each pair of bearing blocks 1002 is adapted to the circular hole 506.

[0060] The bottom of the treatment tank 1 is connected to an exhaust pipe 12. Two symmetrical sliding grooves 15 are opened on one side of the treatment tank 1. Two drive columns 13 are fixedly installed on the top of the lifting plate 503. The two drive columns 13 are adapted to the two sliding grooves 15. The two drive columns 13 are fixedly installed on the bottom of the air box push plate 803. Baffles 14 are fixedly installed on the surface of the two drive columns 13. The two baffles 14 are adapted to the two sliding grooves 15. A switch 16 is fixedly installed on the bottom of the medicine box 701. The extension column 606 is adapted to the switch 16.

[0061] In actual use, the angle between the air supply pipe 801 and the dosing pipe 702 is 45°; the first ring 603 and the second ring 604 are adapted to the circular hole 506; the telescopic sleeve 504 is adapted to the dosing pipe 702; four dosing plates 704 are provided; the bottom of the cleaning pipe 904 is opened and the cleaning pipe 904 is located below the lifting plate 503 in the initial position.

[0062] The working principle of the water pollution treatment equipment provided in this embodiment is as follows:

[0063] First, the filtered wastewater is fed into the treatment tank 1. During this process, the liquid level gradually rises, causing two floats 602 to rise. The rise of the two floats 602 causes the float column 601 to rise. The float column 601 drives two support blocks 1002 to rise through the first ring 603. The two support blocks 1002 drive the lifting plate 503 to rise through the connecting plate 1003. During the rise, the dosing and bellows push plate 803 are moved simultaneously. The rising pawl 607 drives the ratchet 705 to rotate. The ratchet 705 drives the dosing shaft 703 to rotate. The dosing shaft 703 drives the dosing plate 704 to rotate. The rotation of the dosing plate 704 discharges the calcium oxide inside the medicine tank 701 into the wastewater through the telescopic sleeve 504. At the same time, during the rise of the lifting plate 503, the drive column 13 drives the bellows push plate 803 to rise.

[0064] Then, the extension column 606 contacts the switch 16, at which point the starting cylinder 1001 drives the bearing block 1002 to retract. As the float 602 rises to the top, the first ring 603 and the second ring 604 enter above the lifting plate 503. At this time, the lifting plate 503 is rapidly pulled back by the force of the lifting spring 502, which drives the bellows push plate 803 to quickly compress air and input it into the dosing pipe 702 through the air supply pipe 801, generating wind force to output downwards, removing the attached calcium oxide inside the telescopic sleeve 504, and avoiding the long-term use of sewage and calcium oxide to form scale inside, which will lead to poor output later. At this time, the starting cylinder 1001 clamps the second ring 604 again to prevent the float 602 from contacting the stirring mechanism 2.

[0065] Then, the steam generated during the process passes through the vent 505 to the space between the lifting plate 503 and the fixed plate 501, and is then recovered into the interior of the recovery tank 903 through the recovery pipe 901. After the processing tank 1 is finished and discharged, the submersible pump inside the recovery tank 903 is started to clean the interior of the processing tank 1 and the stirring mechanism 2 through the cleaning pipe 904.

[0066] Finally, the drain pipe 12 was manually opened to recover the solids for hazardous waste treatment.

[0067] Compared with related technologies, the water pollution treatment equipment provided in this embodiment has the following beneficial effects:

[0068] By setting a float ball 602 to drive the pawl 607 to engage the ratchet 705 when the sewage level rises, the dosing plate 704 rotates to dosing the chemicals. Quantitative dosing ensures precise addition of chemicals, greatly improving treatment stability and reaction efficiency. The rise in liquid level drives the extension column 606 to contact the switch 16 and open the cylinder 1001. The first ring 603 disengages, causing the lifting plate 503 to quickly fall back. The drive column 13 simultaneously drives the bellows push plate 803 to rise. After resetting, compressed air cleans the telescopic sleeve 504 and the liquid surface, areas prone to scaling, ensuring no chemical residue. The recovery pipe 901 automatically recovers the steam condensate generated during the reaction for subsequent equipment flushing, achieving internal water resource circulation. The quantitative dosing achieved by the rise in liquid level, combined with compressed air purging of the pipeline, effectively prevents calcium oxide scaling and blockage, and ensures precise dosing control. Preventive maintenance extends equipment life, improving the reliability of sewage treatment while reducing overall operating costs.

[0069] A method for preparing nano-silica from silicon-containing waste

[0070] A method for preparing nano-silica from silicon-containing waste includes the following steps:

[0071] S1: Mix silicon-containing waste with hydrochloric acid, and then subject it to water bath, stirring, filtration, washing, and drying to obtain a high-silica insoluble residue;

[0072] S2: Dissolve the insoluble residue of high silicate acid in an alkaline solution, filter, and obtain a sodium silicate solution;

[0073] S3: Add a purifying agent to the sodium silicate solution to remove impurities such as aluminum and iron from the solution, and obtain a purified sodium silicate solution;

[0074] S4: Heat the sodium silicate solution to remove impurities, introduce carbon dioxide, adjust the pH, filter, and obtain silica gel filter cake. The wastewater generated after filtration enters the water pollution treatment equipment for wastewater treatment and resource utilization.

[0075] S5: Wash the silica gel filter cake repeatedly with ethanol and hot water, and dry it to obtain a solid powder;

[0076] S6: Mix the solid powder with a chelating agent to form a water-soluble complex with the metal impurity ions on the surface of silicon dioxide, further removing impurities to obtain silicon dioxide;

[0077] S7: Mix silica and mixed acid, and perform acid leaching to remove residual impurities, thereby obtaining high-purity nano silica.

[0078] First Embodiment

[0079] S1: Mix silicon-containing waste with 2 mol / L hydrochloric acid at a liquid-solid ratio of 6:1, stir in a 60°C water bath for 2 hours, filter, wash with deionized water, and dry to obtain a high-silica insoluble residue.

[0080] S2: Dissolve the high silicate insoluble residue in 20wt% sodium hydroxide solution at 90℃ for 2.5h, filter, and obtain sodium silicate solution;

[0081] S3: Add 6 g / L calcium oxide to the sodium silicate solution and react at 70°C for 3 h to remove impurities such as aluminum and iron from the solution, and obtain a purified sodium silicate solution.

[0082] S4: Heat the sodium silicate solution to 75°C, introduce carbon dioxide at a flow rate of 40 mL / min, stir at 300 rpm, adjust the pH to 9, filter to obtain silica gel filter cake, and the wastewater generated after filtration enters the water pollution treatment equipment for wastewater treatment and resource utilization.

[0083] S5: The silica gel filter cake was repeatedly washed with ethanol and hot water, and dried at 110°C to obtain a solid powder;

[0084] S6: Mix the solid powder with 0.1 mol / L disodium ethylenediaminetetraacetate at 50°C for 1.5 h, adjust the pH to 5, and form a water-soluble complex with the metal impurity ions on the surface of silica to further remove impurities and obtain silica.

[0085] S7: Mix silica with a mixed acid system consisting of 4 mol / L hydrochloric acid, 0.11 mol / L oxalic acid and 0.07 mol / L citric acid, with a liquid-to-solid ratio of 8 mL: 1 g, and acid leaching at 80 °C for 3 h to remove residual impurities, to obtain high-purity nano silica.

[0086] Compared with related technologies, the method for preparing nano-silica from silicon-containing waste provided by the present invention has the following beneficial effects:

[0087] By recycling carbon dioxide, calcium oxide, and sodium hydroxide, a closed-loop process is formed, reducing the use of chemical reagents, acid consumption, carbon emissions, and waste generation. Chelating agents and mixed acids can be recycled. Oxalic acid and citric acid in the mixed acid are biodegradable acids, reducing costs and environmental pollution. This enables high-value utilization of silicon-containing waste, reduces solid waste pollution, avoids the high-temperature conditions and large carbon dioxide emissions associated with sodium carbonate roasting, and significantly improves the recovery rate and purity of silica. High-purity nano silica is 4N grade. The process is simple and easy to industrialize.

[0088] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A water pollution treatment device, characterized in that, include: A treatment tank, one side of which is connected to a sewage pipe; A stirring mechanism is fixedly installed at the bottom of the processing tank via a bracket. The stirring mechanism includes a stirring motor, which is fixedly installed at the bottom of the processing tank via a bracket. The output shaft of the stirring motor is fixedly connected to a stirring shaft. The top end of the stirring shaft penetrates the bottom of the processing tank and extends into the interior. Three sets of inner stirring blades are fixedly installed on the surface of the stirring shaft inside the processing tank via three fixing rings. One end of each of the three sets of inner stirring blades is fixedly connected to an outer stirring blade via a stirring spring. Four vertical stirring blades are symmetrically fixedly installed on both sides of the outer stirring blades. An extraction mechanism for extracting the mixed slurry; A solid-liquid separator, used for solid-liquid separation of extracted mixed slurry; Feed port, which is connected to the top of the processing tank.

2. The water pollution treatment equipment according to claim 1, characterized in that, The extraction mechanism is connected to the bottom of the processing tank. The extraction mechanism includes an extraction pipe connected to the bottom of the processing tank. The end of the extraction pipe is connected to an extraction pump. The output end of the extraction pump is connected to the feed end of the solid-liquid separator through a connecting pipe.

3. The water pollution treatment equipment according to claim 1, characterized in that, A lifting mechanism is fixedly installed on the inner wall of the treatment tank. The lifting mechanism includes a fixed plate, which is fixedly installed on the inner wall of the treatment tank. A lifting plate is fixedly connected to the bottom of the fixed plate by a lifting spring. A telescopic sleeve connects the fixed plate and the lifting plate. Several ventilation holes are opened inside the lifting plate. Two round holes are opened inside both the fixed plate and the lifting plate.

4. The water pollution treatment equipment according to claim 3, characterized in that, Two float mechanisms are slidably installed inside the four circular holes. Each float mechanism includes a float column, which is slidably installed inside the two circular holes. A float is fixedly installed at the bottom end of the float column. A first ring and a second ring are fixedly installed on the surface of the float column, respectively. A disk is fixedly installed at the top end of the float column. An extension column is fixedly installed at the top of the disk. A pawl is fixedly installed on one side of one of the disks via a connecting rod.

5. A water pollution treatment device according to claim 4, characterized in that, A dosing mechanism is fixedly installed on the inner wall of the treatment tank. The dosing mechanism includes a medicine box, which is fixedly installed on the inner wall of the treatment tank. A dosing tube is connected to the bottom of the medicine box. A dosing shaft is rotatably installed on the inner wall of the dosing tube. Both ends of the dosing shaft penetrate the inner wall of the dosing tube and extend to the outside. A dosing plate is fixedly installed on the surface of the dosing shaft inside the dosing tube. A ratchet is fixedly installed on the end of the dosing shaft outside the dosing tube. The pawl engages with the ratchet.

6. A water pollution treatment device according to claim 5, characterized in that, One side of the dosing pipe is connected to a bellows mechanism, which includes an air supply pipe connected to one side of the dosing pipe. One end of the air supply pipe penetrates the inner wall of the treatment tank and extends to the outside. The end of the air supply pipe located outside the treatment tank is connected to a bellows. One side of the bellows is fixedly installed to one side of the treatment tank by a fixing bracket. A bellows pusher plate is slidably installed inside the bellows.

7. The water pollution treatment equipment according to claim 1, characterized in that, The outer wall of the treatment tank is connected to a recycling mechanism, which includes a recycling pipe and a cleaning pipe. The recycling pipe is connected to the outer wall of the treatment tank, and the bottom of the recycling pipe is connected to the recycling tank through a water supply pipe. One end of the cleaning pipe passes through one side of the treatment tank and extends into the interior of the recycling tank. The end of the cleaning pipe located inside the recycling tank is connected to a submersible pump inside the recycling tank.

8. A water pollution treatment device according to claim 3, characterized in that, Four drive mechanisms are fixedly installed on the top of the lifting plate, with each pair of drive mechanisms being fitted together. Each drive mechanism includes a cylinder and a connecting plate. The cylinder is fixedly installed on the top of the lifting plate, and a bearing block is fixedly connected to the output end of the cylinder. The connecting plate is fixedly installed on the top of the lifting plate, and the connecting plate and the bearing block are slidably installed together. Each pair of bearing blocks is fitted together, and each pair of bearing blocks is fitted together with the circular hole.

9. A water pollution treatment device according to claim 6, characterized in that, The bottom of the treatment tank is connected to an vent pipe. Two symmetrical sliding grooves are opened on one side of the treatment tank. Two drive columns are fixedly installed on the top of the lifting plate. The two drive columns are adapted to the two sliding grooves. The two drive columns are fixedly installed on the bottom of the bellows push plate. Baffles are fixedly installed on the surface of the two drive columns. The two baffles are adapted to the two sliding grooves. A switch is fixedly installed at the bottom of the medicine box. The extension column is adapted to the switch.

10. A method for preparing nano-silica from silicon-containing waste, requiring the use of a water pollution treatment device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Mix silicon-containing waste with hydrochloric acid, and then subject it to water bath, stirring, filtration, washing, and drying to obtain a high-silica insoluble residue; S2: Dissolve the insoluble residue of high silicate acid in an alkaline solution, filter, and obtain a sodium silicate solution; S3: Add a purifying agent to the sodium silicate solution to remove impurities such as aluminum and iron from the solution, and obtain a purified sodium silicate solution; S4: Heat the sodium silicate solution to remove impurities, introduce carbon dioxide, adjust the pH, filter, and obtain silica gel filter cake. The wastewater generated after filtration enters the water pollution treatment equipment for wastewater treatment and resource utilization. S5: Wash the silica gel filter cake repeatedly with ethanol and hot water, and dry it to obtain a solid powder; S6: Mix the solid powder with a chelating agent to form a water-soluble complex with the metal impurity ions on the surface of silica, further removing impurities to obtain silica; S7: Mix silica and mixed acid, and perform acid leaching to remove residual impurities, thereby obtaining high-purity nano silica.

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