A method for treating flotation wastewater in the purification of high-purity quartz sand

Abstract

The present invention discloses a method for treating flotation wastewater in the purification of high-purity quartz sand, which includes the steps of: S01: introducing the foam and wastewater generated during the flotation process of the flotation machine into the flotation water tank to eliminate the foam; S02: introducing the wastewater after eliminating the foam into the sedimentation tank, separating the mineral impurities from the flotation reagents through a microwave-assisted stirring device, and then standing still to make the mineral impurities precipitate at the bottom, while the flotation reagents continue to remain in the wastewater; the flotation reagents include a cationic collector and an anionic collector; S03: introducing the standing wastewater into the filtration tank to filter and remove the scum and suspended matter in the wastewater; S04: introducing the filtered wastewater into a cation exchange tower, and the cationic collector is adsorbed in the cation exchange tower; S05: introducing the wastewater flowing through the cation exchange tower into an anion exchange tower, and the anionic collector is adsorbed in the anion exchange tower.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to a method for treating flotation wastewater in the purification of high-purity quartz sand. Background Technique

[0002] High-purity quartz sand refers to quartz with a SiO2 purity of ≥ 99.99%. Due to its excellent chemical stability, high-temperature resistance, low thermal expansion coefficient, and high light transmittance, etc., it plays an irreplaceable role in multiple high-tech industries, especially in high-end manufacturing fields such as semiconductors, photovoltaics, and optical fiber communication. The purification of high-purity quartz sand is not only a material science issue but also a fulcrum for high-end manufacturing, energy transformation, and technological competitiveness. Its technological breakthrough is directly related to the development speed of key fields such as semiconductor autonomy, cost reduction and efficiency increase in photovoltaics, and 5G communication infrastructure.

[0003] At the present stage, the social development has a huge demand for high-purity quartz sand. Therefore, how to efficiently utilize the resources in the quartz sand purification process is of great research significance for reducing enterprise costs and improving economic benefits.

[0004] Flotation is one of the most critical links in the purification of high-purity quartz sand. In its process, the consumption of chemical reagents and water resources is huge. Especially to improve the flotation efficiency, often a large amount of excess flotation reagents and various reagent combinations are required. If the reagents and water resources after flotation are not fully utilized, it will not only reduce the resource utilization rate of the quartz sand purification process but also cause problems such as environmental pollution and increased enterprise production costs.

[0005] Regarding the problem of recycling chemical reagents and wastewater after flotation in the purification process of high-purity quartz sand, the existing recycling technologies cannot meet the requirements of this field: because the high-purity quartz sand purification field is different from traditional mineral purification, and has higher requirements for the flotation efficiency of target minerals and impurities (> 99.9%). In order to achieve a higher separation effect, various reagent combinations (such as anionic collectors, cationic collectors, and foaming agents, etc.), more reagent dosages, and more precise control of the reagent combination ratio are often required during the flotation process. The existing recycling technologies cannot efficiently separate different types of reagents, and thus cannot meet the technical requirements for reagent recovery and wastewater reuse in the flotation of the high-purity quartz sand purification process.

[0006] After retrieval, there are the following existing technologies:

[0007] The patent specification with the publication number CN118811902A discloses a secondary utilization treatment device for quartz sand purification wastewater. It statically treats the wastewater from ore washing, reuses the upper clear water to rinse the residual acid liquid on the surface of the quartz sand ore after pickling, and adds waste iron filings to the pickling waste liquid in the adjustment tank to reconcile and regenerate hydrated crystals of ferrous salts and regenerated acid liquid, achieving the comprehensive utilization of wastewater in the quartz sand purification process and thus improving the economic efficiency of the production line.

[0008] The patent specification with the publication number CN115594353A discloses a treatment method for phosphate rock double reverse flotation wastewater. First, the pH of the wastewater from the mixed phosphate rock double reverse flotation is adjusted to 4 - 5 to obtain pretreated wastewater, and then a mixed eliminator is added to adsorb and eliminate the cationic and anionic collectors in the wastewater. The recycled water obtained after treatment can be returned to the beneficiation process for recycling.

[0009] The existing technologies have the following problems:

[0010] 1) Only the removal of chemicals from the wastewater in the quartz sand flotation process is carried out to achieve water recycling, without classifying and collecting the chemicals in the wastewater and lacking efficient recycling. Since the flotation of high-purity quartz sand is different from traditional mineral flotation, a large amount of different types of flotation chemicals are often added during the process. The inability to recycle these chemicals will not only cause environmental pollution and reduce the resource utilization rate but also increase the production cost of enterprises.

[0011] 2) The existing processes for treating flotation wastewater often require an acidic environment (such as pH = 4). In the long term, on the one hand, the acidic environment will corrode the equipment, and on the other hand, it will also increase environmental pollution. Summary of the Invention

[0012] In view of the above technical problems and the deficiencies in the art, the present invention provides a method for treating flotation wastewater in the purification of high-purity quartz sand, which can achieve the recovery of flotation chemicals and the recycling of the treated water. It can not only recycle the wastewater in flotation but also efficiently recover different flotation chemicals used in flotation, improve the utilization rate of chemical agents, reduce the environmental pollution caused by the high-purity quartz sand purification process, and reduce the production cost of enterprises. In addition, the flotation wastewater treatment method of the present invention does not require additional addition of acids or bases, is environmentally friendly, will not cause equipment corrosion, environmental pollution, or harm to the health of workers.

[0013] A method for treating flotation wastewater in the purification of high-purity quartz sand includes the steps:

[0014] S01: The foam and wastewater generated during the flotation process of the flotation machine are introduced into the flotation water tank to eliminate the foam;

[0015] S02: Introduce the defoamed wastewater into the sedimentation tank, separate the mineral impurities from the flotation reagents through the microwave-assisted stirring device, and then let it stand still to precipitate the mineral impurities at the bottom while the flotation reagents remain in the wastewater; the flotation reagents include cationic collectors and anionic collectors.

[0016] S03: Introduce the wastewater after standing still into the filtration tank to filter out the scum and suspended solids in the wastewater.

[0017] S04: Introduce the filtered wastewater into the cation exchange tower, and the cationic collector is adsorbed in the cation exchange tower.

[0018] S05: Introduce the wastewater flowing through the cation exchange tower into the anion exchange tower, and the anionic collector is adsorbed in the anion exchange tower.

[0019] In the flotation wastewater treatment method for high-purity quartz sand purification, the flotation reagents may further include pH adjusters, etc. The pH adjuster may include hydrochloric acid, etc. Further, the hydrochloric acid may be an aqueous hydrochloric acid solution with a mass fraction of 30% - 38%.

[0020] In the flotation wastewater treatment method for high-purity quartz sand purification, the cationic collector may include one or more of dodecylamine, hexadecylamine, octadecylamine, etc. For example, it may be a composition containing dodecylamine, hexadecylamine, and octadecylamine. Further, the mass ratio of dodecylamine, hexadecylamine, and octadecylamine in the composition may be 1 - 3:1 - 2:1 - 2, etc. The above-listed cationic collectors have a long-chain structure and certain lipophilicity. If the order of steps S04 and S05 is reversed, causing the filtered wastewater to pass through the anion exchange tower first, it will lead to blockage of the anion exchange tower.

[0021] In the flotation wastewater treatment method for high-purity quartz sand purification, the anionic collector may include one or more of sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, sodium oleate, etc. For example, it may be a composition containing sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, and sodium oleate. Further, the mass ratio of sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, and sodium oleate in the composition may be 1 - 3:1 - 2:1 - 2, etc.

[0022] Preferably, in step S01, the flotation process in the flotation machine is reverse flotation.

[0023] In some embodiments, in step S01, the flotation process includes: adding the pretreated crude quartz sand ore into the flotation machine, and introducing clear water and flotation reagents for reverse flotation of quartz.

[0024] The pretreatment may include quartz sand ore crushing, scrubbing, color sorting, calcination, sand making, and magnetic separation.

[0025] The particle size of the crude quartz sand can be 60 - 180 mesh.

[0026] During the flotation process, the mass concentration of the quartz sand pulp can be 60% - 65%.

[0027] During the flotation process, based on the solid mass in the quartz sand pulp, the dosage of the cationic collector can be 20 - 50 g / 500 kg.

[0028] During the flotation process, based on the solid mass in the quartz sand pulp, the dosage of the anionic collector can be 20 - 50 g / 500 kg.

[0029] In some embodiments, in step S01, during the flotation process in the flotation machine, the pH of the foam and wastewater is 4 - 5, such as 4.3, 4.5, etc.

[0030] In step S01, the foam can be eliminated by the defoaming device in the flotation water tank. Preferably, the defoaming device is a mechanical defoamer with impeller blades and / or scrapers, and its rotation speed is 1200 - 1500 r / min, and the foam is directly broken by the impeller blades and / or scrapers rotating at high speed.

[0031] In some embodiments, in step S02, the microwave-assisted stirring device includes a microwave emitter and a mechanical stirrer. Further, the microwave emitter and the mechanical stirrer can be located in the upper layer of the sedimentation tank.

[0032] Preferably, the microwave emitted by the microwave emitter is in pulse mode.

[0033] Preferably, the microwave frequency emitted by the microwave emitter is 2 - 2.45 GHz.

[0034] Preferably, the rotation speed of the mechanical stirrer is 1000 - 1200 r / min;

[0035] In some embodiments, in step S02, the working time of the microwave-assisted stirring device can be 30 - 40 minutes.

[0036] In some embodiments, in step S02, the standing time is 20 - 30 minutes.

[0037] In step S03, the scum and suspended solids in the wastewater can be removed by filtration through a filter membrane. Preferably, the filter membrane is an acid and alkali resistant tubular ceramic membrane.

[0038] Preferably, the pore size of the filter membrane is 5 - 10 µm.

[0039] Preferably, the filtration flow rate of the filter membrane is controlled at 15 - 20 BV / h.

[0040] Preferably, in step S04, the cation exchange column is a chromatographic column wound in a spiral shape, and its filler is a macroporous strongly acidic cation exchange resin, which is effective in the pH range of 0-14. The particle size range of the filler is 20-100 mm, and the wastewater flow rate is controlled at 15-20 BV / h.

[0041] Preferably, the method for treating flotation wastewater in the purification of high-purity quartz sand further includes eluting and recovering the cationic collector adsorbed in the cation exchange column and using it for flotation, specifically including: eluting the cationic collector adsorbed in the cation exchange column with a first eluent solution, dissolving the dried product of the effluent with a first solvent, wherein the cationic collector is dissolved in the first solvent and the first eluent is insoluble, obtaining a cationic collector solution and insoluble matter, and taking the cationic collector solution to remove the first solvent to obtain the cationic collector for flotation.

[0042] Preferably, the first eluent includes sodium chloride, etc.

[0043] Preferably, the first eluent solution includes an aqueous sodium chloride solution, etc. More preferably, the mass fraction of sodium chloride in the aqueous sodium chloride solution is 10%-15%.

[0044] Preferably, the elution flow rate of the first eluent solution is controlled at 2-4 BV / h.

[0045] Preferably, the first solvent includes ethanol, etc.

[0046] Preferably, the first solvent is removed by drying.

[0047] Preferably, in step S05, the anion exchange column is a chromatographic column wound in a spiral shape, and its filler is a macroporous strongly basic anion exchange resin, which is effective in the pH range of 0-14. The particle size range of the filler is 20-100 mm, and the wastewater flow rate is controlled at 15-20 BV / h.

[0048] Preferably, the method for treating flotation wastewater in the purification of high-purity quartz sand further includes eluting and recovering the anionic collector adsorbed in the anion exchange column and using it for flotation, specifically including: eluting the anionic collector adsorbed in the anion exchange column with a second eluent solution, dissolving the dried product of the effluent with a second solvent, wherein the anionic collector is dissolved in the second solvent and the second eluent is insoluble, obtaining an anionic collector solution and insoluble matter, and taking the anionic collector solution to remove the second solvent to obtain the anionic collector for flotation.

[0049] Preferably, the second eluent includes sodium chloride, etc.

[0050] Preferably, the second eluent solution includes an aqueous sodium chloride solution, etc. More preferably, the mass fraction of sodium chloride in the aqueous sodium chloride solution is 10% - 15%.

[0051] Preferably, the elution flow rate of the second eluent solution is controlled at 2 - 4 BV / h.

[0052] Preferably, the second solvent includes ethanol, etc.

[0053] Preferably, the second solvent is removed by drying.

[0054] In some embodiments, the pH of the effluent from the anion exchange tower in step S05 is 6 - 7, such as 6.2, 6.5, 6.7, etc.

[0055] In some embodiments, the total organic carbon (TOC) concentration of the effluent from the anion exchange tower in step S05 is less than 30 mg / L.

[0056] In some embodiments, the total organic carbon removal rate of the flotation wastewater treatment method in the purification of high-purity quartz sand is greater than 87%;

[0057] Preferably, the flotation wastewater treatment method in the purification of high-purity quartz sand further includes using the effluent from the anion exchange tower in step S05 for flotation.

[0058] The flotation wastewater treatment method of the present invention has a recovery rate of cationic collector and anionic collector greater than 82%.

[0059] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0060] 1. The flotation wastewater treatment method of the present invention can not only fully recycle the flotation wastewater, but also fully recover and utilize the chemical agents in flotation through a new process, improving the resource utilization rate and reducing the production cost of enterprises.

[0061] 2. The flotation wastewater treatment method of the present invention is a flotation wastewater treatment method without adding external acids or alkalis, and does not require additional addition of acids or alkalis, which is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a process flow diagram of a flotation wastewater treatment method in the purification of high-purity quartz sand of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0063] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The operation methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by the manufacturer.

[0064] SeeFigure 1 , a method for treating flotation wastewater in the purification of high-purity quartz sand, comprising: introducing the foam and wastewater generated during the flotation process of a flotation machine into a flotation water tank to eliminate the foam; introducing the wastewater after eliminating the foam into a sedimentation tank, separating mineral impurities from flotation reagents through a microwave-assisted stirring device, the microwave-assisted stirring device comprising a microwave emitter and a mechanical stirrer located in the upper layer of the sedimentation tank, then standing still to allow the mineral impurities to precipitate at the bottom, and the flotation reagents remaining in the wastewater; the flotation reagents comprising a cationic collector and an anionic collector; introducing the standing wastewater into a filtration tank to filter and remove the scum and suspended solids in the wastewater; introducing the filtered wastewater into a cation exchange tower, and the cationic collector being adsorbed in the cation exchange tower; introducing the wastewater flowing through the cation exchange tower into an anion exchange tower, and the anionic collector being adsorbed in the anion exchange tower; the effluent of the anion exchange tower being collected in a storage tank and reused for the flotation of the flotation machine; and, eluting and recovering the cationic collector adsorbed in the cation exchange tower and the anionic collector adsorbed in the anion exchange tower and reusing them for the flotation of the flotation machine.

[0065] The following introduces a specific case based on the above flotation wastewater treatment method.

[0066] Example 1:

[0067] Flotation process. Add 500 kg of pretreated quartz sand of 60 - 180 mesh to the flotation machine, add 300 L of clear water to prepare a pulp with a mass fraction of 62.5%, use hydrochloric acid as a pH adjuster to adjust the pulp pH = 2, then add 50 g of a cationic collector (mass ratio of dodecylamine:hexadecylamine:octadecylamine is 3:1:1), stir for 15 minutes; then add 50 g of an anionic collector (mass ratio of sodium dodecylsulfonate:sodium dodecylbenzenesulfonate:sodium oleate is 3:1:1) for the reverse flotation of quartz, and control the water replenishment amount to be 100 L during the flotation process. The pretreatment includes quartz sand ore crushing, scrubbing, color sorting, calcination, sand making, and magnetic separation.

[0068] Wastewater treatment process. The foam and wastewater generated during the flotation process are introduced into the flotation water tank, and defoaming is carried out by a mechanical defoamer with impeller blades in the tank at a rotational speed of 1200 r / min until the foam is eliminated; then the water in the flotation water tank is introduced into the sedimentation tank, and the microwave generator (operating in pulse mode, microwave frequency of 2.45 GHz) and the mechanical stirrer (rotational speed of 1200 r / min) are turned on for 30 minutes of operation time, and then left to stand for 30 minutes. Mineral impurities precipitate at the bottom, and the flotation reagents remain in the water; then the wastewater in the sedimentation tank is introduced into the filtration tank, and the floating slag and suspended matter in the wastewater are removed by filtration through an acid and alkali resistant tubular ceramic filter membrane with a pore size of 10 µm, and the flow rate is controlled at 15 BV / h. The filtered wastewater is successively introduced into the cation exchange tower and the anion exchange tower, and the wastewater flow rate is controlled at 15 BV / h for both. Finally, the treated water is introduced into the storage tank and reused in the flotation process.

[0069] Reagent recovery process. After the wastewater treatment is completed, 10 L of 10% NaCl aqueous solution by mass is used as the eluent solution to elute the cation exchange resin and the anion exchange resin respectively. The eluted solutions are dried in an oven, and the oven temperature is controlled not to exceed 80 °C. After the water has completely evaporated, 500 mL of ethanol is used for dissolution respectively. The insoluble matter is inorganic salts. The ethanol is collected and dried to obtain the corresponding cationic collector and anionic collector, which are reused in the flotation process.

[0070] Table 1 shows the various indexes of the wastewater before and after treatment in Example 1, where: the wastewater before treatment refers to the foam and wastewater generated during the flotation process; the wastewater after treatment refers to the effluent from the anion exchange tower, that is, the water in the storage tank; the relevant definitions will not be elaborated further below.

[0071] Table 1

[0072]

[0073] Example 2:

[0074] Flotation process. The difference from the flotation process in Example 1 is only that the dosages of both the cationic collector and the anionic collector are changed to 20 g, and the rest are the same.

[0075] The wastewater treatment process and the reagent recovery process are the same as those in Example 1.

[0076] Table 2 shows the various indexes of the wastewater before and after treatment in Example 2.

[0077] Table 2

[0078]

[0079] Example 3:

[0080] Flotation process. The difference from the flotation process of Example 1 is only that the composition of the cationic collector is a mass ratio of dodecylamine: hexadecylamine: octadecylamine of 1:2:2, and the composition of the anionic collector is a mass ratio of sodium dodecylsulfonate: sodium dodecylbenzenesulfonate: sodium oleate of 1:2:2, and the rest are the same.

[0081] The wastewater treatment process and the reagent recovery process are the same as those in Example 1.

[0082] Table 3 shows the various indexes before and after the wastewater treatment in Example 3.

[0083] Table 3

[0084]

[0085] Example 4:

[0086] The water in the storage tank of the wastewater treatment process and the cationic collector and anionic collector obtained from the reagent recovery process in Example 1 are reused in the flotation process according to Example 1. Among them, 20% (by mass ratio) of the cationic and anionic collectors used in Example 1 need to be added separately as supplementary reagents and added to the flotation process together with the recovered reagents, and the wastewater treatment process and the reagent recovery process are carried out according to Example 1, which is recorded as the first recovery operation. Subsequently, the water in the storage tank obtained from the first recovery and the cationic collector and anionic collector are continued to be applied according to the above process to complete the second recovery operation.

[0087] Table 4 shows the various indexes before and after the wastewater treatment in the second recovery operation of Example 4.

[0088] Table 4

[0089]

[0090] Table 5 shows the contents of some main substances in quartz sand before and after different flotation operations in Example 1 and Example 4.

[0091] Table 5

[0092]

[0093] Through various test data, it shows that after the classified recovery and treatment of wastewater and reagents, the collected reagents and recycled water can be reused 2 times, and there is no obvious impact on the flotation purification of quartz sand (the change in SiO2 content does not exceed 1 wt%).

[0094] In summary, the flotation wastewater treatment method in the purification of high-purity quartz sand of the present invention has the following characteristics:

[0095] First, different types of flotation reagents are efficiently separated and recovered through an ion exchange tower. The prior art does not recycle the remaining reagents in the wastewater after flotation.

[0096] Second, the entire process flow is green and environmentally friendly, without the addition of extra chemical reagents.

[0097] Third, the recycling of flotation reagents and wastewater in the high-purity quartz sand purification process is realized twice, reducing the production cost of enterprises.

[0098] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. A method for treating flotation wastewater in the purification of high-purity quartz sand, characterized in that, Including the steps: S01: Introduce the foam and wastewater generated during the flotation process of the flotation machine into the flotation water tank to eliminate the foam; S02: Introduce the wastewater after eliminating the foam into the sedimentation tank, separate the mineral impurities from the flotation reagents through a microwave-assisted stirring device, and then let it stand to make the mineral impurities precipitate at the bottom, while the flotation reagents continue to remain in the wastewater; the flotation reagents include cationic collectors and anionic collectors; S03: Introduce the wastewater after standing into the filtration tank to filter and remove the scum and suspended solids in the wastewater; S04: Introduce the filtered wastewater into the cation exchange tower, and the cationic collector is adsorbed in the cation exchange tower; S05: Introduce the wastewater flowing through the cation exchange tower into the anion exchange tower, and the anionic collector is adsorbed in the anion exchange tower; The method for treating flotation wastewater in the purification of high-purity quartz sand further includes eluting and recovering the cationic collector adsorbed in the cation exchange tower and using it for flotation, specifically including: eluting the cationic collector adsorbed in the cation exchange tower with a first eluent solution, dissolving the dried product of the effluent with a first solvent, wherein the cationic collector is dissolved in the first solvent and the first eluent is insoluble, obtaining a cationic collector solution and insoluble matter, taking the cationic collector solution to remove the first solvent to obtain the cationic collector for flotation; the first eluent includes sodium chloride; the first solvent includes ethanol; The method for treating flotation wastewater in the purification of high-purity quartz sand further includes eluting and recovering the anionic collector adsorbed in the anion exchange tower and using it for flotation, specifically including: eluting the anionic collector adsorbed in the anion exchange tower with a second eluent solution, dissolving the dried product of the effluent with a second solvent, wherein the anionic collector is dissolved in the second solvent and the second eluent is insoluble, obtaining an anionic collector solution and insoluble matter, taking the anionic collector solution to remove the second solvent to obtain the anionic collector for flotation; the second eluent includes sodium chloride; the second solvent includes ethanol.

2. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, wherein The flotation reagents further include a pH adjuster, and the pH adjuster includes hydrochloric acid; The cationic collector includes one or more of dodecylamine, hexadecylamine, and octadecylamine; The anionic collector includes one or more of sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, and sodium oleate.

3. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, wherein, In step S01: The flotation process of the flotation machine is reverse flotation; The pH of the foam and wastewater generated during the flotation process of the flotation machine is 4 - 5; Eliminate the foam through the defoaming device in the flotation water tank, and the defoaming device is a mechanical defoamer with impeller blades and / or scrapers, whose rotation speed is 1200 - 1500 r / min, and the foam is directly broken by the high-speed rotating impeller blades and / or scrapers.

4. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, characterized in that, In step S02: The microwave-assisted stirring device includes a microwave emitter and a mechanical stirrer; The microwave emitter and the mechanical stirrer are located in the upper layer of the sedimentation tank; The microwave emitted by the microwave emitter is in pulse mode, and the emitted microwave frequency is 2 - 2.45 GHz; The rotation speed of the mechanical stirrer is 1000 - 1200 r / min; The working time of the microwave-assisted stirring device is 30 - 40 minutes; The standing time is 20 - 30 minutes.

5. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, characterized in that, In step S03: The scum and suspended solids in the wastewater are removed by filtration through a filter membrane; The filter membrane is an acid - and alkali - resistant tubular ceramic membrane; The pore size of the filter membrane is 5 - 10 µm; The filtration flow rate of the filter membrane is controlled at 15 - 20 BV / h.

6. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, characterized in that, In step S04, the cation exchange tower is a chromatographic column wound in a spiral shape, and its filler is a macroporous strongly acidic cation exchange resin, which is effective in the pH range of 0 - 14. The particle size range of the filler is 20 - 100 mm, and the wastewater flow rate is controlled at 15 - 20 BV / h.

7. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, characterized in that, The first eluent solution includes an aqueous sodium chloride solution, and the mass fraction of sodium chloride in the aqueous sodium chloride solution is 10% - 15%; The elution flow rate of the first eluent solution is controlled at 2 - 4 BV / h; The first solvent is removed by drying.

8. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, wherein In step S05, the anion exchange tower is a chromatographic column wound in a spiral shape, and its filler is a macroporous strongly basic anion exchange resin, which is effective in the pH range of 0 - 14. The particle size range of the filler is 20 - 100 mm, and the wastewater flow rate is controlled at 15 - 20 BV / h.

9. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, characterized in that, The second eluent solution includes an aqueous sodium chloride solution, and the mass fraction of sodium chloride in the aqueous sodium chloride solution is 10% - 15%; The elution flow rate of the second eluent solution is controlled at 2 - 4 BV / h; The second solvent is removed by drying.

10. The flotation wastewater treatment method in the purification of high-purity quartz sand according to claim 1, characterized in that, In step S05, the pH of the effluent from the anion exchange tower is 6 - 7, and the total organic carbon concentration is less than 30 mg / L; The total organic carbon removal rate of the flotation wastewater treatment method in the purification of high - purity quartz sand is greater than 87%; The flotation wastewater treatment method in the purification of high - purity quartz sand further includes using the effluent from the anion exchange tower in step S05 for flotation.

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