Green low-consumption purification method of high-purity quartz

Abstract

The invention relates to the technical field of high-purity quartz purification methods, in particular to a high-purity quartz green low-consumption purification method which comprises the following steps: S1, plasma-assisted crushing pretreatment; s2, complex acid leaching-microwave synergistic impurity removal; s3, fluidized chloridizing roasting; s4, nano bubble water washing-targeted adsorption; s5, performing vacuum heat purification; according to the purification method of the high-purity quartz, the step of complex acid leaching-microwave synergistic impurity removal is adopted, highly toxic hydrofluoric acid in a traditional chemical acid leaching method is abandoned, and the toxicity of waste liquid is greatly reduced; compared with a traditional high-temperature chlorination method which needs a high temperature of 1300 DEG C or above, the method adopts fluidized chlorination roasting, so that the roasting temperature is reduced by 500 DEG C, and the energy consumption is reduced by 40%; nano-bubble ultrapure water is adopted for ultrasonic cleaning, the cleaning efficiency can be improved by 50%, and residual impurities are effectively removed; through innovative design and synergistic effect of all the steps, ultra-high purity of SiO2 with the purity being greater than or equal to 99.996% is realized, and meanwhile, environmental protection, energy conservation and consumption reduction as well as industrial stable production are taken into consideration.

Description

Technical Field

[0001] The present invention relates to the technical field of high-purity quartz purification methods, and in particular to a green and low-consumption purification method for high-purity quartz. Background Art

[0002] High-purity quartz (SiO2) is the core material in cutting-edge fields such as semiconductor chips, fiber optic communications, and photovoltaic cells. Its purity is ≥99.995%. Its impurities include Al, Fe, Ti, and B, and the impurity content must be strictly controlled at the ppm level.

[0003] The existing purification technology has the following bottlenecks: 1. Chemical acid leaching: Relying on hydrofluoric acid (HF) to dissolve inclusions, but HF is highly toxic and the waste liquid treatment cost is high, which can easily cause environmental pollution; 2. High-temperature chlorination method: chlorine gas must be introduced at temperatures above 1300°C, which consumes huge amounts of energy and makes the equipment susceptible to corrosion. Residual chloride ions affect product stability. 3. Physical separation method: Flotation and magnetic separation have insufficient removal rates for submicron inclusions, making it difficult to achieve purity exceeding 99.99%; 4. Bioleaching method: The cycle is long, taking 20-30 days. The activity of the strain is limited by the mineral composition, making industrial application difficult.

[0004] Current technology cannot achieve ultra-high purity, environmental protection and economy at the same time.

[0005] Therefore, in view of the above-mentioned chemical acid leaching method relying on highly toxic hydrofluoric acid, high waste liquid treatment cost and environmental pollution; high-temperature chlorination method with huge energy consumption, easy corrosion of equipment and residual chloride ions affecting product stability; physical sorting method with insufficient removal rate of submicron inclusions and difficulty in achieving ultra-high purity; biological extraction method with too long cycle, bacterial activity limited by ore composition, difficult industrial application, and difficulty in taking into account ultra-high purity, environmental protection and economy, a green and low-cost purification method for high-purity quartz can be designed. Summary of the Invention

[0006] In order to overcome the problems of traditional high-purity quartz purification technology, such as high pollution, high energy consumption, difficulty in achieving purity standards, and limited industrialization.

[0007] The technical solution of the present invention is: a green and low-consumption purification method for high-purity quartz, the steps of which are as follows: S1: Plasma-assisted fragmentation pretreatment First, the raw quartz ore is fed into a primary crusher for initial crushing, reducing its particle size to a range suitable for subsequent processing. The crushed quartz ore is then screened using a vibrating screen to select quartz particles with a particle size of 50-100 mesh. The selected quartz particles are then fed into a low-temperature plasma treatment chamber, where the generated low-temperature plasma bombards the quartz surface. S2: Complex acid leaching-microwave synergistic impurity removal Accurately weigh citric acid, tartaric acid, and ethylenediaminetetraacetic acid according to a certain ratio, dissolve them in an appropriate amount of water, and prepare a composite complex acid solution with a total concentration of 8-12%. Then, place the above-mentioned quartz particles in a special acid-resistant reaction container, pour in the prepared composite complex acid solution, place the reaction container in a microwave reactor, turn on microwave heating, and gradually increase the temperature of the reaction system to 70-90°C. Maintain this temperature range for 4-6 hours. S3: Fluidized Chlorination Roasting The quartz sand and ammonium chloride were accurately weighed and thoroughly mixed in a mass ratio of 8:1. The mixed materials were transferred to a fluidized bed reactor, nitrogen was introduced into the reactor to establish a nitrogen protective atmosphere, and then roasted for 30-40 minutes; S4: Nanobubble water washing-targeted adsorption The quartz sand is placed in an ultrasonic cleaning tank, nanobubble ultrapure water is poured in, and an ultrasonic cleaning machine is turned on for cleaning. After cleaning, a functionalized mesoporous silica adsorbent is added to the cleaning tank. The adsorbent surface is grafted with amino groups and thiol groups, which can selectively adsorb trace impurities remaining in the quartz sand. S5: Vacuum thermal purification The above quartz sand was transferred to a vacuum heat treatment furnace, the furnace door was closed, the vacuum system was started, and the temperature in the furnace was raised to 600°C. The temperature was maintained for continuous heat treatment for 2 hours to obtain a high-purity quartz sand product.

[0008] Preferably, a plasma generator is provided inside the low-temperature plasma treatment chamber for generating low-temperature plasma and performing surface treatment on the quartz. The power of the plasma generator is adjusted to be maintained in the range of 5-10kW. During this process, the energy of the low-temperature plasma will cause microcracks in the inclusions inside the quartz. These microcracks can significantly enhance the reaction activity of the quartz in subsequent processing steps, creating more favorable conditions for the removal of impurities.

[0009] Preferably, when the Al impurity content in the quartz is high and other metal impurities are relatively small, the mass ratio of citric acid, tartaric acid and ethylenediaminetetraacetic acid is 10:2:1.

[0010] Preferably, when the Fe and Ti impurity contents in quartz are high and the Al content is relatively low, the mass ratio of citric acid, tartaric acid and ethylenediaminetetraacetic acid is 6:4:2.

[0011] Preferably, when the impurities in the quartz are complex in type and balanced in content, the mass ratio of citric acid, tartaric acid and ethylenediaminetetraacetic acid is 3:3:4.

[0012] As preferred, in the step S2, the microwave frequency of the microwave reactor is 2.45 GHz, and the power is 3-5 kW; under the combined action of microwave assistance and complexing acid solution, the metal oxides on the quartz surface can be selectively dissolved to realize the preliminary impurity removal.

[0013] As preferred, in the step S3, the fluidized bed reactor is internally provided with a gas distribution plate, which can uniformly distribute the nitrogen gas, so that the material forms a fluidized state; meanwhile, the reactor is equipped with a heating device, and the temperature is accurately controlled at 750-800 DEG C, and the temperature range is maintained during the calcination.

[0014] As preferred, in the step S4, the nanobubble generating device is used to convert the ultrapure water into nanobubble ultrapure water containing a large number of nanobubbles with a diameter of less than 200 nm; the ultrasonic cleaning machine has a frequency of 80 kHz, and the quartz sand is subjected to ultrasonic cleaning for 1-2 hours; under the action of the ultrasonic waves, the nanobubbles can more effectively impact the surface of the quartz sand, so that the residual impurity particles and by-products generated during the acid leaching and calcination process are removed.

[0015] As preferred, in the step S4, the functionalized mesoporous silica adsorbent comprises 70%-80% of mesoporous silica framework, 5%-10% of amino functional groups and 5%-10% of mercapto functional groups, and the trace impurities adsorbed by the functionalized mesoporous silica adsorbent include B and Cu.

[0016] As preferred, in the step S5, the vacuum system is started to gradually reduce the pressure in the furnace to 600 DEG C, and under the conditions of vacuum and high temperature, the volatile impurities adsorbed in the quartz sand are desorbed from the surface of the quartz sand and escape, so that the final high-purity quartz sand product is obtained.

[0017] The present application has the following advantages: the plasma-assisted crushing pretreatment technology breaks the limitation of poor removal effect of sub-micron inclusions in traditional physical separation, significantly improves the subsequent reaction activity, lays a foundation for deep removal of inclusion impurities, and is a key starting step for realizing ultra-high purity. The complexing acid leaching-microwave-assisted impurity removal step discards the highly toxic hydrofluoric acid in the traditional chemical acid leaching method, greatly reduces the toxicity of waste liquid, realizes green environmental protection, heats to 70-90 DEG C under the assistance of microwave, and leaches for 4-6 hours; compared with the traditional acid leaching, the time is shortened by 30%, and the selective heating characteristics of microwave are utilized to efficiently and selectively dissolve the surface metal oxides, thereby improving the impurity removal efficiency. Compared to the traditional high-temperature chlorination method, which requires temperatures exceeding 1300°C, this method uses fluidized chlorination roasting, which reduces the roasting temperature by 500°C and energy consumption by 40%. At the same time, ammonium chloride is used instead of chlorine, avoiding harmful gas emissions and equipment corrosion. It also allows impurities in the inclusions to be converted into gaseous chlorides that escape, further removing impurities. Ultrasonic cleaning with nanobubble ultrapure water can increase cleaning efficiency by 50% and effectively remove residual impurities. The addition of functionalized mesoporous silica adsorbents with amino and thiol groups grafted on the surface can accurately and selectively adsorb residual trace impurities such as B and Cu, ensuring the ultra-high purity of the quartz sand. The vacuum heat purification step can completely remove adsorbed volatile impurities, ensuring the purity of the final product. The entire process is suitable for the continuous production of quartz sand with a particle size of 50-500μm, and the adsorbent can be recycled more than 10 times, achieving mass production with an impurity content (Al+Fe+Ti≤15ppm), which has significant industrial advantages. The method of the present invention achieves an ultra-high purity of SiO2 of ≥99.996% through the innovative design and synergistic effect of each step, while taking into account green environmental protection, energy saving and consumption reduction, and stable industrial production, thus solving the bottleneck problem of traditional high-purity quartz purification technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a flow chart of the green and low-cost purification method of high-purity quartz of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] The present invention provides an embodiment: a green and low-cost purification method for high-purity quartz, the steps of which are as follows: S1: Plasma-assisted fragmentation pretreatment First, the raw quartz ore is fed into a primary crusher for initial crushing, reducing its particle size to a range suitable for subsequent processing. The crushed quartz ore is then screened using a vibrating screen to select quartz particles with a particle size of 50-100 mesh. The selected quartz particles are then fed into a low-temperature plasma treatment chamber, where the generated low-temperature plasma bombards the quartz surface. A plasma generator is installed within the low-temperature plasma treatment chamber to generate low-temperature plasma and perform surface treatment on the quartz. The power of the plasma generator is adjusted to maintain it within the range of 5-10 kW. During this process, the energy of the low-temperature plasma causes microcracks in the inclusions within the quartz. These microcracks significantly enhance the reactivity of the quartz in subsequent processing steps, creating more favorable conditions for impurity removal. S2: Complex acid leaching-microwave synergistic impurity removal Citric acid, tartaric acid, and ethylenediaminetetraacetic acid are accurately weighed in a certain proportion and dissolved in an appropriate amount of water to prepare a composite complex acid solution with a total concentration of 8-12%. The quartz particles are then placed in a specially prepared acid-resistant reaction vessel, and the prepared composite complex acid solution is poured into the vessel. The reaction vessel is placed in a microwave reactor and microwave heating is activated to gradually raise the temperature of the reaction system to 70-90°C and maintain this temperature range for 4-6 hours. The microwave frequency of the microwave reactor is 2.45 GHz and the power is 3-5 kW. Under the combined action of microwave assistance and the composite complex acid solution, the metal oxides on the quartz surface can be selectively dissolved, thereby achieving preliminary impurity removal. When the Al impurity content in quartz is high and other metal impurities are relatively low, the mass ratio of citric acid, tartaric acid, and EDTA is 10:2:1. When the Fe and Ti impurity contents in quartz are high and the Al content is relatively low, the mass ratio of citric acid, tartaric acid, and EDTA is 6:4:2. When the impurities in quartz are complex and the content is balanced, the mass ratio of citric acid, tartaric acid, and EDTA is 3:3:4. S3: Fluidized Chlorination Roasting The quartz sand and ammonium chloride are accurately weighed and fully mixed in a mass ratio of 8:1, and the mixed materials are transferred to a fluidized bed reactor. Nitrogen is introduced into the reactor to establish a nitrogen protective atmosphere, and then roasted for 30-40 minutes. The fluidized bed reactor is provided with a gas distribution plate to evenly distribute the introduced nitrogen and fluidize the material. At the same time, the reactor is equipped with a heating device to accurately control the temperature at 750-800°C and maintain this temperature range for continuous roasting; S4: Nanobubble water washing-targeted adsorption The quartz sand is placed in an ultrasonic cleaning tank, nanobubble ultrapure water is poured into it, and an ultrasonic cleaning machine is turned on for cleaning. After cleaning, a functionalized mesoporous silica adsorbent is added to the cleaning tank. The adsorbent has amino and thiol groups grafted on its surface, which can selectively adsorb trace impurities remaining in the quartz sand. A nanobubble generating device is used to convert the ultrapure water into nanobubble ultrapure water containing a large number of nanobubbles with a diameter of less than 200 nm. The ultrasonic cleaning machine is used at a frequency of 80 kHz, and the quartz sand is ultrasonically cleaned for 1-2 hours. Under the action of ultrasound, the nanobubbles can more effectively impact the surface of the quartz sand, removing residual impurity particles and byproducts generated during acid leaching and roasting. The functionalized mesoporous silica adsorbent comprises 70%-80% of a mesoporous silica skeleton, 5%-10% of amino functional groups, and 5%-10% of thiol functional groups. The trace impurities it adsorbs include B and Cu. S5: Vacuum thermal purification Transfer the above quartz sand into the vacuum heat treatment furnace, close the furnace door, start the vacuum system, and gradually reduce the pressure in the furnace to A vacuum environment is created, and the temperature in the vacuum heat treatment furnace is raised to 600°C by a heating device. The temperature is maintained for 2 hours. Under the conditions of vacuum and high temperature, the volatile impurities adsorbed in the quartz sand will desorb and escape from the surface of the quartz sand, thereby obtaining the final high-purity quartz sand product.

[0021] Example 1 A green and low-cost purification method for high-purity quartz, wherein the raw material is Brazilian quartz ore, with an initial SiO2 purity of 99.3%, containing 0.2% Al2O3, 0.08% Fe2O3, and 0.05% TiO2; The steps are as follows: S1: Plasma-assisted fragmentation pretreatment First, the raw quartz ore is fed into a primary crusher for initial crushing, reducing its particle size to a range suitable for subsequent processing. The crushed quartz ore is then screened using a vibrating screen to select quartz particles with a particle size of 80 mesh. The selected quartz particles are then fed into a low-temperature plasma treatment chamber, where the generated low-temperature plasma bombards the quartz surface. A plasma generator is installed within the low-temperature plasma treatment chamber to generate low-temperature plasma and perform surface treatment on the quartz. The power of the plasma generator is adjusted to maintain within the 8kW range, and the reaction time is 15 minutes. During this process, the energy of the low-temperature plasma will cause microcracks in the inclusions inside the quartz. These microcracks can significantly increase the reactivity of the quartz in subsequent processing steps, creating more favorable conditions for the removal of impurities. S2: Complex acid leaching-microwave synergistic impurity removal Citric acid, tartaric acid, and ethylenediaminetetraacetic acid are accurately weighed in a certain proportion and dissolved in an appropriate amount of water to prepare a composite complex acid solution with a total concentration of 8-12%. The quartz particles are then placed in a specially prepared acid-resistant reaction vessel, and the prepared composite complex acid solution is poured into the vessel. The reaction vessel is placed in a microwave reactor and microwave heating is activated to gradually raise the temperature of the reaction system to 85°C and maintain this temperature range for 5 hours. The microwave frequency of the microwave reactor is 2.45 GHz and the power is 3-5 kW. Under the combined action of microwave assistance and the composite complex acid solution, the metal oxides on the quartz surface can be selectively dissolved, thereby achieving preliminary impurity removal. The mass ratio of citric acid, tartaric acid and ethylenediaminetetraacetic acid in the composite complex acid solution is 10:2:1; S3: Fluidized Chlorination Roasting The quartz sand and ammonium chloride are accurately weighed and fully mixed in a mass ratio of 8:1, and the mixed materials are transferred to a fluidized bed reactor, and nitrogen is introduced into the reactor to establish a nitrogen protective atmosphere, and then roasted for 35 minutes. The fluidized bed reactor is provided with a gas distribution plate to evenly distribute the introduced nitrogen and fluidize the material. At the same time, the reactor is equipped with a heating device to accurately control the temperature at 780°C and maintain this temperature range for continuous roasting; S4: Nanobubble water washing-targeted adsorption The quartz sand is placed in an ultrasonic cleaning tank, nanobubble ultrapure water is poured into it, and an ultrasonic cleaning machine is turned on for cleaning. After cleaning, a functionalized mesoporous silica adsorbent is added to the cleaning tank. The adsorbent has amino and thiol groups grafted onto its surface, which can selectively adsorb trace impurities remaining in the quartz sand. A nanobubble generating device is used to convert the ultrapure water into nanobubble ultrapure water containing a large number of nanobubbles with a diameter of less than 200 nm. The ultrasonic cleaning machine is used at a frequency of 80 kHz, and the quartz sand is ultrasonically cleaned for 1.5 hours. Under the action of ultrasound, the nanobubbles can more effectively impact the surface of the quartz sand, removing residual impurity particles and byproducts generated during acid leaching and roasting. The functionalized mesoporous silica adsorbent comprises 70%-80% of a mesoporous silica skeleton, 5%-10% of amino functional groups, and 5%-10% of thiol functional groups, and the trace impurities adsorbed by the functionalized mesoporous silica adsorbent specifically include B and Cu. S5: Vacuum thermal purification Transfer the above quartz sand into the vacuum heat treatment furnace, close the furnace door, start the vacuum system, and gradually reduce the pressure in the furnace to A vacuum environment is created, and the temperature in the vacuum heat treatment furnace is raised to 600°C by a heating device. The temperature is maintained for 2 hours. Under the conditions of vacuum and high temperature, the volatile impurities adsorbed in the quartz sand will desorb and escape from the surface of the quartz sand, thereby obtaining the final high-purity quartz sand product with a SiO2 purity of 99.997%, Al of 4ppm, Fe of 1ppm, and Ti of 2ppm.

[0022] Experimental Example 1: The above-mentioned Example 1 is used as Experimental Example 1, the traditional HF acid leaching method is used as Experimental Example 2, the traditional high-temperature chlorination method is used as Experimental Example 3, the traditional physical separation method is used as Experimental Example 4, and the traditional bioleaching method is used as Experimental Example 5; Raw materials: Brazilian quartz ore was uniformly selected, with an initial SiO2 purity of 99.3%, containing 0.2% Al2O2, 0.08% Fe2O2, and 0.05% TiO2. The raw materials were evenly divided into five groups, with each experimental raw material weighing 50 kg; Experimental Example 2: 50 kg of quartz ore was placed in an acid-resistant container, 10% hydrofluoric acid solution was added, and the ore was leached at room temperature for 6 hours, then filtered and washed with water; Experimental Example 3: Quartz ore was calcined in a high-temperature furnace at 1350°C with chlorine gas, and then cooled and collected. Experimental Example 4: Flotation treatment was first performed for 4 hours, followed by magnetic separation for 4 hours, and the separated quartz sand was collected; Experimental Example 5: Mix quartz ore with bacteria and nutrient solution, leaching for 25 days under a suitable environment, and separating quartz sand; For the quartz sand treated by each method, the impurity content was detected by inductively coupled plasma mass spectrometry (ICP-MS) to calculate the SiO2 purity; the pollutants (such as wastewater and waste gas) and energy consumption data generated by each method were recorded as follows:

[0023] It can be seen from the above experimental data that compared with the traditional method, the method of the present invention can purify quartz with high purity, be green and environmentally friendly, and save energy and reduce consumption, and is suitable for the continuous industrial production of quartz sand with a particle size of 50-500μm.

Claims

1. A green and low-consumption purification method for high-purity quartz, characterized in that: The steps are as follows: S1: Plasma-assisted fragmentation pretreatment First, the raw quartz ore is fed into a primary crusher for initial crushing, reducing its particle size to a range suitable for subsequent processing. The crushed quartz ore is then screened using a vibrating screen to select quartz particles with a particle size of 50-100 mesh. The selected quartz particles are then fed into a low-temperature plasma treatment chamber, where the generated low-temperature plasma bombards the quartz surface. S2: Complex acid leaching-microwave synergistic impurity removal Accurately weigh citric acid, tartaric acid, and ethylenediaminetetraacetic acid according to a certain ratio, dissolve them in an appropriate amount of water, and prepare a composite complex acid solution with a total concentration of 8-12%. Then, place the above-mentioned quartz particles in a special acid-resistant reaction container, pour in the prepared composite complex acid solution, place the reaction container in a microwave reactor, turn on microwave heating, and gradually increase the temperature of the reaction system to 70-90°C. Maintain this temperature range for 4-6 hours. S3: Fluidized Chlorination Roasting The quartz sand and ammonium chloride were accurately weighed and thoroughly mixed in a mass ratio of 8:

1. The mixed materials were transferred to a fluidized bed reactor, nitrogen was introduced into the reactor to establish a nitrogen protective atmosphere, and then roasted for 30-40 minutes; S4: Nanobubble water washing-targeted adsorption The quartz sand is placed in an ultrasonic cleaning tank, nanobubble ultrapure water is poured in, and an ultrasonic cleaning machine is turned on for cleaning. After cleaning, a functionalized mesoporous silica adsorbent is added to the cleaning tank. The adsorbent surface is grafted with amino groups and thiol groups, which can selectively adsorb trace impurities remaining in the quartz sand. S5: Vacuum thermal purification The above quartz sand was transferred to a vacuum heat treatment furnace, the furnace door was closed, the vacuum system was started, and the temperature in the furnace was raised to 600°C. The temperature was maintained for continuous heat treatment for 2 hours to obtain a high-purity quartz sand product.

2. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: In step S1, a plasma generator is provided inside the low-temperature plasma treatment chamber to generate low-temperature plasma and perform surface treatment on the quartz. The power of the plasma generator is adjusted to maintain it within the range of 5-10kW. During this process, the energy of the low-temperature plasma will cause microcracks in the inclusions inside the quartz. These microcracks can significantly enhance the reactivity of the quartz in subsequent treatment steps, creating more favorable conditions for the removal of impurities.

3. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: When the Al impurity content in quartz is high and other metal impurities are relatively small, the mass ratio of citric acid, tartaric acid and ethylenediaminetetraacetic acid is 10:2:

1.

4. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: When the Fe and Ti impurity contents in quartz are high and the Al content is relatively low, the mass ratio of citric acid, tartaric acid and EDTA is 6:4:

2.

5. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: When the impurities in quartz are complex and balanced in content, the mass ratio of citric acid, tartaric acid and ethylenediaminetetraacetic acid is 3:3:

4.

6. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: In step S2, the microwave frequency of the microwave reactor is 2.45 GHz and the power is 3-5 kW; under the combined action of microwave assistance and composite complexing acid solution, the metal oxides on the quartz surface can be selectively dissolved to achieve preliminary impurity removal.

7. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: In step S3, a gas distribution plate is provided inside the fluidized bed reactor to evenly distribute the nitrogen gas introduced, so that the material forms a fluidized state. At the same time, the reactor is equipped with a heating device to accurately control the temperature at 750-800°C and maintain this temperature range for continuous roasting.

8. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: In step S4, a nanobubble generator is used to convert ultrapure water into nanobubble ultrapure water containing a large number of nanobubbles with a diameter of less than 200 nm. The ultrasonic cleaning machine is used at a frequency of 80 kHz to perform ultrasonic cleaning on the quartz sand for 1-2 hours. Under the action of ultrasound, the nanobubbles can more effectively impact the surface of the quartz sand, removing residual impurity particles and by-products generated during acid leaching and roasting.

9. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: The functionalized mesoporous silica adsorbent in step S4 includes 70%-80% of a mesoporous silica skeleton, 5%-10% of amino functional groups, and 5%-10% of thiol functional groups, and the adsorbed trace impurities include B and Cu.

10. The green and low-consumption purification method for high-purity quartz according to claim 1, characterized in that: In step S5, the vacuum system is started to gradually reduce the pressure in the furnace to A vacuum environment is created, and the temperature in the vacuum heat treatment furnace is raised to 600°C through a heating device. Under the conditions of vacuum and high temperature, the volatile impurities adsorbed in the quartz sand will desorb and escape from the surface of the quartz sand, thereby obtaining the final high-purity quartz sand product.

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