CN116159665A - Gangue quartz raw material screening method for preparing low-gas-liquid inclusion high-purity quartz sand - Google Patents

Abstract

The present invention proposes a method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions. The screening method includes the following steps: selective crushing and dissociation—scrubbing and washing—dehydration and classification—atomization and application—surface modification - Polishing homogenization - Sorting coarse particles based on machine vision pre-selection Throwing tail - Screening of low gas-liquid inclusion particles based on transparency difference - Grading and utilization of different grades of raw material particles. The invention realizes the screening of high-purity quartz raw materials with low gas-liquid inclusion content and the graded utilization of high-purity quartz raw materials with different transparency through the particle size control, surface modification and transparency optimization of quartz raw materials, sorting according to the difference in particle transparency, and effectively reduces high-gas The contamination of high-quality quartz sand products by liquid inclusion impurity particles after sand making.

Description

A screening method for vein quartz raw material for preparing high-purity quartz sand with low gas-liquid inclusions

technical field

The invention relates to the technical field of high-purity quartz beneficiation, in particular to a method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions.

Background technique

Quartz glass is a special high-grade glass with a single component _SiO2 , which has excellent chemical stability, high infrared spectrum transmittance, strong impact resistance, high temperature resistance (above 1800 degrees Celsius) without deformation, resistance to X-ray radiation, Excellent physical and chemical properties such as electrical insulation, widely used in electronic industry, optical communication, medical equipment, SiO ₂ thin film materials, large-scale integrated circuits, lasers, aerospace, military industries, etc. to provide cutting-edge materials.

High-purity quartz raw material is a strategic mineral resource that is scarce in the world and in short supply in my country, and is critical to the safety of chip, optical fiber, photovoltaic and high-end equipment manufacturing industries. my country's current industrial high-purity quartz raw materials mainly rely on foreign imports. The main reason is that domestic high-purity quartz raw materials are rich in solid mineral impurities and gas-liquid inclusion impurities. For solid mineral impurities such as mica, rutile, and epidote associated with quartz, through high-temperature calcination, water quenching, sand making, magnetic separation, superconducting separation, flotation, electric separation, acid leaching, high-temperature chlorination, ultrasonic treatment, doping Miscellaneous purification and other means can completely remove extragranular mineral impurities and partially remove grain boundary impurities, but cannot remove gas-liquid inclusion impurities in tiny crystals.

The gas-liquid inclusion impurity refers to the impurity formed when the quartz ore crystal grows _. It _is mainly composed of a liquid _phase and a small bubble. , CH ₄ , CO ₂ , H ₂ O and other structural impurities wrapped in the quartz crystal, the existing technology is difficult to eliminate such defects, especially for gas-liquid inclusions below 5 μm. The harm of gas-liquid inclusion impurities to high-purity quartz products is that the element impurities in the inclusions affect the purity of quartz glass, and the second is that gas-liquid inclusions form a large number of bubbles and gas lines during the preparation of quartz glass, which seriously affects the light transmission of quartz glass products Sexuality and high temperature stability lead to the ineffective utilization of high-quality quartz ore.

The existing removal methods of gas-liquid inclusion impurities in quartz sand mainly include: acid-base differential corrosion method, cold/heat burst method, chlorination degassing method, microwave radiation-acid leaching method, etc., which remove gas-liquid inclusions. The effect may be unsatisfactory, because the bursting method can open some inclusions with larger diameters, but cannot open gas-liquid inclusions below 5 μm. Chlorination, acid leaching and other methods can remove some impurities in the opened large-diameter cavity, but due to the cavitation effect, bubbles and gas lines will still appear in the process of fused silica glass with such quartz sand and affect product quality, and Due to the hidden safety hazards in the complex operation process of the process, the production process is not environmentally friendly. Therefore, the selection of raw materials with less inclusion impurities is the basis for the subsequent effective purification of high-purity quartz.

Contents of the invention

The present invention proposes a method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions. Through particle size control, surface modification and transparency optimization of vein quartz raw materials, low gas-liquid inclusion content can be achieved by sorting according to the difference in particle transparency. The screening of high-purity quartz raw materials and the graded utilization of high-purity quartz raw materials with different transparency can effectively reduce the pollution of high-quality quartz sand products after sand making by impurity particles with high gas-liquid inclusions.

The technical solution of the present invention is achieved in the following way: a method for screening raw material of vein quartz for preparing high-purity quartz sand with low gas-liquid inclusions, comprising the following steps:

(1) Vein quartz raw ore is crushed and classified in two stages and one closed circuit to obtain -20+2mm granular materials and -2mm granular materials;

(2) Scrub and wash the -20+2mm granular material with water, and add 50-200g/t water glass as a dispersant and cleaning agent during the scrubbing process;

(3) The granular material after scrubbing in step (2) is screened, classified, dehydrated, and drained to obtain granular products of different particle sizes of -20+10mm, -10+5mm and -5+2mm, and the surface of the granular product is kept moist , the water content is less than 5wt%;

(4) The particle products of different particle sizes in step (3) are respectively surface-modified with low-viscosity colorless agents, polished and homogenized;

(5) Carry out the color sorting operation to the particle products of different particle sizes modified in step (4) respectively, remove dark particles and yellow-skin particles impregnated with iron-containing minerals, and obtain color-sorted quartz particles of different particle sizes;

(6) The color-selected quartz particles of step (5) are carried out the transparency sorting operation to obtain all white and porcelain white particles, transparent quartz particle products and translucent quartz particle products, transparent quartz particle products and translucent quartz particle products are low High-purity quartz raw material with gas-liquid inclusion impurities.

Further, in step (4), the dosage of the low-viscosity colorless medicament is 1-6% of the dry basis weight of the granular product; the low-viscosity colorless medicament is water, ethanol, ethyl acetate, transformer oil, low-viscosity silicone oil and oily One or more of dispersants.

Further, in step (4), the low-viscosity and colorless medicament is added by atomization, and after the dosing, a kneader is used to polish and homogenize the surface of the granule product, so as to control the film thickness of the surface modifying medicament and improve the concentration of the medicament on the surface of the raw material. Uniformity and stability.

Further, in step (5), the color sorting operation includes one-stage color sorting and two-stage color sorting. The first-stage color sorting removes dark particles to obtain the first-stage color-sorting particles of different particle sizes, and the first-stage color-sorting particles of different particle sizes are respectively The second-stage color separation removes the yellow skin particles impregnated with iron-containing minerals to obtain color-selected quartz particles of different particle sizes.

Further, in step (6), the transparency sorting operation includes one stage of transparency sorting and two stages of transparency sorting, and the color sorted quartz particles are subjected to one stage of transparency sorting to obtain one section of transparent particles and all white and porcelain white particles, one section of transparent particles Carry out two-stage transparency sorting to obtain transparent quartz granule products and translucent quartz granule products.

Further, the specific method of one-stage color sorting is as follows: use a dual-lens crawler-type color sorter for color sorting, with the background light and foreground light on the upper and lower sides fully turned on, and under the condition of visible light, use CCD area array photoelectric sensor to identify sensitive spots On-line value analysis, the feeding speed is 2.8-3.2m/s, the sorting air pressure is 0.7-0.8MPa, by identifying and removing dark particles with a sorting sensitivity threshold of 180 and a spot threshold of 30, the second-stage color sorting quartz particles are obtained.

Further, the specific method of the second-stage color sorting is as follows: use a dual-lens crawler-type color sorter for color sorting, the background light and foreground light on both sides of the upper and lower sides are fully turned on, and under the condition of visible light, use CCD area array photoelectric sensor to identify the sensitivity On-line analysis of speckle value, the feeding speed is 2.8-3.2m/s, the sorting air pressure is 0.7-0.8MPa, and the yellow leather particles with a sorting sensitivity threshold of 105 and a speckle threshold of 25 are identified and eliminated, and the second-stage color-sorted quartz particles are obtained.

Further, the specific method of one-stage transparency sorting is as follows: use a dual-lens crawler-type color sorter for sorting, turn off the upper side lighting and the upper and lower background lights, and only turn on the lower side lighting, and the feeding speed is 2.8- 3.0m/s, sorting air pressure 0.7-0.8MPa, recognition sensitivity threshold 180-210, speckle threshold 5-15, obtain a section of transparent particles and all white and porcelain white particles.

Further, the specific method of the second-stage transparency sorting is as follows: use a dual-lens crawler-type color sorter for sorting, turn off the upper side lighting and the upper side background light, turn on the lower side lighting and the lower side background light, use The CCD area array photoelectric sensor on the lower side identifies the quartz particles in the process of parabolic falling, the feeding speed is 2.8-3.0m/s, the sorting air pressure is 0.7-0.8MPa, the recognition sensitivity threshold is 120-180, the spot threshold is 0-5, and the transparent Quartz granule products and translucent quartz granule products.

Further, the -2mm particle size material in step (1) and the all-white and porcelain white particles in step (7) are combined into a powder product, which can be used to prepare 3N photovoltaic quartz sand or fused silica.

Further, the dark granules in step (5) are combined with the yellow granules in step (6) as comprehensive tailings, which can be used to manufacture foundry sand or machine-made sand.

Beneficial effects of the present invention:

The invention proposes "selective crushing and dissociation-scrubbing and washing-dehydration and classification-atomization and dosing-surface modification-polishing and homogenization-based on machine vision sorting of coarse particles and pre-selection of tailings-based on transparency difference and low gas-liquid inclusion particles Screening—gradual utilization of different grades of raw material particles” process method. For the gas-liquid inclusions below 5 μm, if the color separation and transparency beneficiation are carried out directly, the screening effect of the small particle size gas-rich liquid inclusion particles is poor. The atomization application of the present invention is beneficial to accurately control the dosage of the drug and improve the uniformity of the drug addition. The surface modification adopts low-viscosity colorless agent, the viscosity of the agent is 150±10%, and the refractive index is 1.5150±0.05. The refractive index of the agent is similar to that of quartz crystal particles, which can offset the astigmatism caused by air. The color solvent forms optical films with different anti-reflection effects on the surface of the particles, amplifies the differences in particle transparency characteristics, and improves the identification accuracy of quartz materials with low gas-liquid inclusions.

The invention realizes the screening of high-purity quartz raw materials with low gas-liquid inclusion content and the graded utilization of high-purity quartz raw materials with different permeability based on the particle sorting of transparency difference, effectively reducing the impact on high-quality quartz sand products after sand making by impurity particles with high gas-liquid inclusions pollution.

The present invention is based on CCD machine vision color and transparency difference sorting to realize the pre-selection and separation of coarse-grained mineral impurity particles. Transparent and transparent particle identification and automatic sorting, remove impurity particles of refractory gas-rich liquid inclusions, realize the classification of different grades of raw materials, protect and utilize high-quality resources to the greatest extent; solve the problem of narrow particle size range and low recognition accuracy of traditional manual sorting , high labor intensity, low efficiency, difficult industrial scale production technical problems, and improved resource utilization; the invention has important reference value for establishing a quantitative evaluation system for the availability of high-purity quartz and guiding the quality, sorting and grading utilization of high-purity quartz raw materials .

The present invention can partly replace the low-efficiency and high-cost selective mining method, and improve the mining efficiency; it can process the ore veins with narrow width and high dilution rate, uneven ore-forming ore-forming veins, boundaries and surrounding rocks of uniform ore-forming ore-forming veins, Improve resource utilization. Obtain some high-purity quartz raw materials for different transparency quartz particles in uneven ore-forming vein quartz ore bodies, and at the same time realize the graded utilization of resources of different grades. In my country's large-scale vein quartz resource bases such as Donghai in Jiangsu, Dawu in Hubei, Qichun, Heyuan in Guangdong, and Shangluo in Shaanxi It has a prospect of popularization and application.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the process flow diagram of screening method of the present invention;

Fig. 2 is the picture of vein quartz raw ore;

Fig. 3 is the picture of transparent quartz particle product;

Figure 4 is a picture of a translucent quartz particle product;

Figure 5 is a picture of integrated tailings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, a method for screening raw material of vein quartz for preparing high-purity quartz sand with low gas-liquid inclusions comprises the following steps:

(1) Vein quartz raw ore is crushed and classified in two stages and one closed circuit to obtain -20+2mm granular materials and -2mm granular materials;

(2) -20+2mm granular materials are scrubbed and washed with water to remove granule skin slime and particles with many brittle cracks. During the scrubbing process, 50-200g/t water glass is added as a dispersant and cleaning agent;

(3) The scrubbed granular materials in step (2) are screened, classified, dehydrated, and drained to obtain granular products with different narrow grades of -20+10mm, -10+5mm and -5+2mm, and the particle surface is controlled to maintain Wet, with a water content of less than 5wt%;

(4) Step (3) Particle products of different particle sizes are surface-modified, kneaded and homogenized with low-viscosity colorless solvents, and optical films with different anti-reflection effects are formed on the surface of the particles to amplify the difference in particle transparency characteristics and improve low-gas The identification accuracy of liquid inclusion quartz raw materials; the low-viscosity colorless solvent is one or more compatible solvents among water, ethanol, ethyl acetate, transformer oil, and low-viscosity silicone oil. High and low temperature, anti-oxidation, high flash point, low volatility, good insulation, low surface tension, no corrosion to metal, non-toxic, etc. The amount of low-viscosity and colorless solvent is 1-6% of the dry weight of the granular product. Adjust the dosage according to the size of the particle size, and the particle product is discrete and non-cohesive.

(5) After the step (4) is modified, the products of different grain grades are respectively selected by a double-lens crawler-type color sorter. The specific method is as follows: the upper and lower sides of the background light and the foreground light are fully turned on. Under the condition of visible light, CCD area array photoelectric sensor is used to identify and analyze the sensitivity spot value online. The feeding speed is 2.8-3.2m/s, and the sorting air pressure is 0.7-0.8MPa. By identifying and sorting the dark particle waste with a sensitivity threshold of 180 and a spot threshold of 30, Sorting and removing dark mineral impurity particles such as biotite and chlorite to obtain color-selected particles of different particle sizes;

The first-stage color sorting particles of different particle sizes are selected by a dual-lens crawler-type color sorter for the second-stage color sorting. The specific method is as follows: the background light on both sides and the foreground light are fully turned on. Under the condition of visible light, the CCD area array photoelectric sensor is used. Identify and conduct online analysis of the sensitivity spot value, the feeding speed is 2.8-3.2m/s, and the sorting air pressure is 0.7-0.8MPa. By identifying the yellow particle waste with a sorting sensitivity threshold of 105 and a spot threshold of 25, the iron-containing ore is sorted and eliminated. The yellow skin granules impregnated with materials can be used to obtain second-stage color-selected quartz particles of different particle sizes; the yellow skin granules are combined with dark granule waste to obtain comprehensive tailings, which can be used to manufacture foundry sand or machine-made sand;

(6) The second-stage color sorting quartz particles of different particle sizes are classified and sorted for transparency particles, specifically including one-stage transparency sorting and two-stage transparency sorting; the specific method of one-stage transparency sorting is as follows: a double-lens crawler type color sorter is used , the upper lighting and the upper and lower measurement background lights are all turned off, only the lower lighting is turned on. The feeding speed is 2.8-3.0m/s, the sorting air pressure is 0.7-0.8MPa, the recognition sensitivity threshold is 180-210, and the spot threshold is 5- 15. Obtain a section of transparent granules, full white and porcelain white granules respectively, and a section of transparent granules are high-brightness granules with good transparency;

One-stage transparent particles are sorted by two-stage transparency, the specific method is as follows: use a dual-lens crawler-type color sorter, turn off the upper side lighting and the upper side background light, turn on the lower side lighting and the lower side background light, use the lower side The CCD area array photoelectric sensor identifies the quartz particles in the process of parabolic fall, the light will penetrate the transparent particles, partly penetrate the translucent ore particles, the opaque part of the particles will generate a signal on the background plate, and the sensor will receive the signal and respond , to achieve sorting of translucent and transparent particles, the feeding speed is 2.8-3.0m/s, the sorting air pressure is 0.7-0.8MPa, the recognition sensitivity threshold is 120-180, and the spot threshold is 0-5. Transparent quartz grain products.

After calcination, water quenching, sand making, gravity separation, magnetic separation, flotation, acid leaching and roasting, transparent quartz granule products are purified to obtain 4N75 high-purity quartz sand with a _SiO2 grade of 99.9975%; translucent quartz granule products are calcined , water quenching, sand making, gravity separation, magnetic separation, flotation, acid leaching, roasting and purification to obtain 4N grade high-purity quartz sand.

Specific examples are as follows:

The grade of _SiO2 in a vein quartz raw ore is 96.69%. As shown in Figure 2, it is accompanied by mineral impurities such as large epidote, and some cracks are dyed yellow by iron minerals. Using the vein quartz raw material screening method for preparing high-purity quartz sand with low gas-liquid inclusions of the present invention, the vein quartz raw ore is firstly crushed, medium crushed and screened to obtain -20+2mm grain size minerals, and +20mm grain size minerals are returned Medium crushing work.

-20+2mm grain grade minerals are scrubbed and washed, screened and graded, dehydrated, drained, divided into three grades of -20+10mm, -10+5mm, -5+2mm, and surface modification, one-stage color sorting , two-stage color sorting, one-stage transparency sorting and two-stage transparency sorting to obtain transparent quartz granule products, translucent quartz granule products, comprehensive tailings and all-white and porcelain white granules, -2mm grain size minerals and all-white and porcelain White granules are used as powder products. The transparent quartz granule product is shown in Figure 3, the translucent quartz granule product is shown in Figure 4, and the comprehensive tailings are shown in Figure 5. The raw quartz ore is used to prepare high-purity quartz raw materials, and the beneficiation technical indicators of pre-throwing tailings are shown in Table 1. .

Table 1 Mineral processing technical indicators of vein quartz raw ore pre-selection and discarding tailings

It can be seen from Table 1 that the yield of comprehensive tailings is 3.90%, the removal rate (recovery rate) of harmful mineral impurities such as Fe ₂ O ₃ and Al ₂ O ₃ is 55.22% and 61.23%, respectively, and the effect of pre-selection tailings is remarkable. The yield of transparent quartz granules is 63.73%, and the grade of _SiO2 is 99.77%. After sand making, gravity separation, magnetic separation, flotation, and acid leaching, the grade of _SiO2 is 99.9985%. The product of 4N85 high-purity quartz sand is obtained . The combined yield of translucent quartz particle concentrate and powder products is 32.37%, and the grade of SiO ₂ is 94.32%. It can be used as a secondary raw material to realize the graded utilization of all resources.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. The gangue quartz raw material screening method for preparing the low-gas-liquid inclusion high-purity quartz sand is characterized by comprising the following steps of:

(1) Crushing and grading the gangue raw ore in a two-section one-closed-circuit manner to obtain a-20+2 mm granular material and a-2 mm granular material;

(2) Scrubbing and washing the granular material with-20+2 mm, wherein water glass with the concentration of 50-200g/t is added as a dispersing agent and a cleaning agent in the scrubbing process;

(3) The particle materials scrubbed in the step (2) are subjected to screening classification, dehydration and draining to obtain particle products with different particle sizes of-20+10 mm, -10+5mm and-5+2 mm, wherein the surfaces of the particle products are kept moist, and the water content is less than 5wt%;

(4) Carrying out surface modification on the granular products with different grades in the step (3) by adopting a low-viscosity colorless medicament, and polishing and homogenizing;

(5) Performing color selection operation on the particle products with different particle sizes after modification in the step (4), and removing dark particles and wampee particles impregnated with iron-containing minerals to obtain color-selected quartz particles with different particle sizes;

(6) And (3) carrying out transparency sorting operation on the color-selected quartz particles in the step (5) to obtain full-white porcelain white particles, transparent quartz particle products and semitransparent quartz particle products which are high-purity quartz raw materials with low gas-liquid inclusion impurities.

2. The method for screening gangue materials for preparing low-gas-liquid-content coated high-purity quartz sand according to claim 1, wherein in step (4), the dosage of the low-viscosity colorless medicament is 1-6% of the dry basis weight of the granular product; the low-viscosity colorless medicament is one or more of water, ethanol, ethyl acetate, transformer oil, low-viscosity silicone oil and oily dispersing agent.

3. The method for screening gangue materials for preparing low gas-liquid coated high purity quartz sand according to claim 1 or 2, wherein in step (4), the low viscosity colorless agent is added by atomization, and the surface polishing and homogenization of the granular product are performed by a kneader after the addition of the agent.

4. The method for screening the gangue materials for preparing the low-gas-liquid-content high-purity quartz sand according to claim 1, wherein in the step (5), the color selection operation comprises one-stage color selection and two-stage color selection, the one-stage color selection eliminates dark particles to obtain one-stage color selection particles with different particle sizes, the one-stage color selection particles with different particle sizes are respectively subjected to two-stage color selection, and the wampee particles impregnated with iron-containing minerals are eliminated to obtain the color selection quartz particles with different particle sizes.

5. The method for screening gangue materials for preparing low gas-liquid coated high purity quartz sand according to claim 1, wherein in step (6), the transparency sorting operation comprises one-stage transparency sorting and two-stage transparency sorting, wherein the color-selected quartz particles are subjected to one-stage transparency sorting to obtain one-stage transparent particles and full-white hyacinth bletilla particles, and the one-stage transparent particles are subjected to two-stage transparency sorting to obtain transparent quartz particle products and semitransparent quartz particle products.

6. The method for screening gangue materials for preparing low-gas-liquid-content high-purity quartz sand according to claim 4, wherein the specific method for one-stage color selection is as follows: and (3) performing color selection by adopting a double-lens crawler-type color selector, opening the upper and lower sides by using background light and a front Jing Guangquan, performing online analysis on sensitivity spot values by adopting CCD area array photoelectric sensor identification under the condition of visible light irradiation, sorting dark particles with the air pressure of 0.7-0.8MPa and the spot threshold value of 30 by identifying and sorting the sensitivity threshold value of 180, and removing to obtain the two-stage color-selected quartz particles.

7. The screening method for preparing gangue materials of low gas-liquid coated high-purity quartz sand according to claim 4, wherein the specific method of two-stage color selection is as follows: and (3) performing color selection by adopting a double-lens crawler-type color selector, opening the upper and lower sides by using background light and a front Jing Guangquan, performing online analysis on sensitivity spot values by adopting CCD area array photoelectric sensor identification under the condition of visible light irradiation, sorting wampee particles with the air pressure of 0.7-0.8MPa and the spot threshold value of 25 by identifying and sorting sensitivity threshold 105, and removing to obtain the two-stage color-selected quartz particles.

8. The method for screening gangue materials for preparing low gas-liquid coated high purity quartz sand according to claim 5, wherein the specific method for one-stage transparency sorting is as follows: the double-lens crawler-type color selector is adopted for sorting, the upper side illuminating lamp and the upper and lower background lights are all turned off, only the lower side illuminating lamp is turned on, the feeding speed is 2.8-3.0m/s, the sorting air pressure is 0.7-0.8MPa, the recognition sensitivity threshold is 180-210, the spot threshold is 5-15, and a section of transparent particles and full-white and porcelain white particles are obtained.

9. The method for screening gangue materials for preparing low gas-liquid coated high purity quartz sand according to claim 5, wherein the specific method for two-stage transparency sorting is as follows: the double-lens crawler-type color selector is adopted for sorting, the upper side illuminating lamp and the upper side background light are all turned off, the lower side illuminating lamp and the lower side background light are all turned on, quartz particles in the falling process of parabolas are identified by using the lower side CCD area array photoelectric sensor, the feeding speed is 2.8-3.0m/s, the sorting air pressure is 0.7-0.8MPa, the identification sensitivity threshold is 120-180, and the spot threshold is 0-5, so that transparent quartz particle products and semitransparent quartz particle products are obtained.

10. The method for screening gangue materials for preparing low-gas-liquid-content high-purity quartz sand according to claim 1, wherein the-2 mm-sized material in step (1) and the full-white porcelain white particles in step (6) are combined into a powder product, and can be used for preparing 3N photovoltaic quartz sand or fused quartz; the dark particles and the wampee particles in the step (5) are combined to be used as comprehensive tailings, and can be used for manufacturing casting sand or machine-made sand.

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