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

Abstract

This invention proposes a method for screening vein quartz raw materials to prepare 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—atomized chemical application—surface modification—polishing and homogenization—machine vision-based sorting of coarse particles for pre-selection and tailing—screening of low-gas-liquid inclusion particles based on transparency differences—gradation and utilization of raw material particles of different grades. This invention achieves the screening of high-purity quartz raw materials with low gas-liquid inclusion content and the grading and utilization of high-purity quartz raw materials with different transparency levels by controlling the particle size, surface modification, and transparency optimization of quartz raw materials, and by sorting according to differences in particle transparency. This effectively reduces the contamination of high-gas-liquid inclusion impurities on high-quality quartz sand products after sand making.

Description

Technical Field

[0001] This invention relates to the field of high-purity quartz beneficiation technology, and in particular to a method for screening vein quartz raw materials to prepare high-purity quartz sand with low gas-liquid inclusions. Background Art

[0002] Quartz glass is a special high-grade glass made of single-component SiO2. It has excellent chemical stability, high infrared spectral transmittance, strong impact resistance, high temperature resistance (above 1800 degrees Celsius) without deformation, resistance to X-ray radiation, and excellent electrical insulation properties. It is widely used in the electronics industry, optical communication, medical instruments, SiO2 thin film materials, large-scale integrated circuits, lasers, aerospace, and military industries to provide cutting-edge materials.

[0003] High-purity quartz raw materials are a scarce strategic mineral resource globally and in short supply in my country, crucial for the security of the chip, optical fiber, photovoltaic, and high-end equipment manufacturing industries. Currently, my country's high-purity quartz raw materials are mainly imported, primarily because domestically produced high-purity quartz is rich in solid mineral impurities and gas-liquid inclusions. While methods such as high-temperature calcination, water quenching, sand making, magnetic separation, superconducting separation, flotation, electrostatic separation, acid leaching, high-temperature chlorination, ultrasonic treatment, and doping purification can completely remove extragranular mineral impurities and partially remove grain boundary impurities, they cannot remove gas-liquid inclusions within the tiny crystals.

[0004] Gas-liquid inclusions refer to impurities formed during the growth of quartz crystals. These are two-phase inclusions primarily composed of a liquid phase and a small gas bubble. These are structural impurities formed during mineral growth, where H2, O2, N2, CO, CH4, CO2, and H2O are encapsulated within the quartz crystal. Current processing technologies struggle to completely eliminate these defects, especially for gas-liquid inclusions smaller than 5μm. The harms of gas-liquid inclusions to high-purity quartz products are twofold: firstly, elemental impurities within the inclusions affect the purity of the quartz glass; secondly, gas-liquid inclusions form numerous bubbles and gas lines during quartz glass manufacturing, severely impacting the light transmittance and high-temperature stability of quartz glass products, rendering high-quality quartz ore unusable.

[0005] Existing methods for removing gas-liquid inclusions from quartz sand mainly include acid-base differential corrosion, cold / hot degassing, chlorination degassing, and microwave radiation-acid leaching. However, these methods are not always effective at removing gas-liquid inclusions because degassing can open some larger inclusions but not those smaller than 5μm. Chlorination and acid leaching can remove some impurities from already opened large-diameter cavities, but due to the cavitation effect, bubbles and gas lines still appear during the melting of this type of quartz sand into quartz glass, affecting product quality. Furthermore, these methods are complex, pose safety hazards, and are not environmentally friendly. Therefore, selecting raw materials with fewer inclusions is fundamental to the effective purification of high-purity quartz. Summary of the Invention

[0006] This invention proposes a method for screening vein quartz raw materials to prepare high-purity quartz sand with low gas-liquid inclusions. By controlling the particle size, surface modification and transparency optimization of vein quartz raw materials, the method achieves 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 based on the difference in particle transparency. This effectively reduces the contamination of high-gas-liquid inclusion impurity particles on high-quality quartz sand products after sand making.

[0007] The technical solution of this invention is achieved as follows: a method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions, comprising the following steps:

[0008] (1) The vein quartz ore was crushed and classified in two stages and one closed circuit to obtain -20+2mm particle material and -2mm particle size material.

[0009] (2) The -20+2mm granular material is scrubbed and washed with water. During the scrubbing process, 50-200g / t of water glass is added as a dispersant and cleaning agent.

[0010] (3) The granular material after step (2) is screened, graded, dehydrated and drained to obtain granular products of different sizes: -20+10mm, -10+5mm and -5+2mm. The surface of the granular products is kept moist and the moisture content is less than 5wt%.

[0011] (4) The particle products of different particle sizes in step (3) are surface modified with a low-viscosity colorless agent and polished and homogenized.

[0012] (5) The particle products of different sizes after modification in step (4) are sorted by color to remove dark particles and yellow particles that are stained by iron minerals, so as to obtain sorted quartz particles of different sizes.

[0013] (6) Perform transparency sorting on the color-sorted quartz particles from step (5) to obtain all-white and porcelain-white particles, transparent quartz particle products and semi-transparent quartz particle products. The transparent quartz particle products and semi-transparent quartz particle products are high-purity quartz raw materials with low gas-liquid inclusion impurities.

[0014] Further, in step (4), the amount of low-viscosity colorless agent is 1-6% of the dry weight of the granular product; the low-viscosity colorless agent is one or more of water, ethanol, ethyl acetate, transformer oil, low-viscosity silicone oil and oily dispersant.

[0015] Furthermore, in step (4), the low-viscosity colorless agent is added by atomization, and after the agent is added, the surface of the granular product is polished and homogenized by a kneader to control the coating thickness of the surface modified agent and improve the uniformity and stability of the agent on the surface of the raw material.

[0016] Furthermore, in step (5), the color sorting operation includes a first-stage color sorting and a second-stage color sorting. The first-stage color sorting removes dark-colored particles to obtain first-stage color sorted particles of different sizes. The first-stage color sorted particles of different sizes are then subjected to second-stage color sorting to remove yellow-skinned particles that are stained by iron-containing minerals, thereby obtaining color sorted quartz particles of different sizes.

[0017] Furthermore, in step (6), the transparency sorting operation includes a first-stage transparency sorting and a second-stage transparency sorting. The color-sorted quartz particles undergo a first-stage transparency sorting to obtain a first-stage transparent particle and pure white and porcelain white particles. The first-stage transparent particles undergo a second-stage transparency sorting to obtain transparent quartz particle products and semi-transparent quartz particle products.

[0018] Furthermore, the specific method for the first stage of color sorting is as follows: a dual-lens conveyor color sorter is used for color sorting, with the background light and foreground light on both sides fully turned on. Under visible light illumination, a 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. Dark particles with a sorting sensitivity threshold of 180 and a spot threshold of 30 are identified and removed to obtain the second stage of color sorted quartz particles.

[0019] Furthermore, the specific method for two-stage color sorting is as follows: a dual-lens conveyor color sorter is used for color sorting, with the background light and foreground light on both sides fully turned on. Under visible light illumination, a 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. Yellow-skinned particles with a sorting sensitivity threshold of 105 and a spot threshold of 25 are identified and removed to obtain two-stage color-sorted quartz particles.

[0020] Furthermore, the specific method for sorting by transparency is as follows: a dual-lens conveyor color sorter is used for sorting, with the upper lighting and the background lights on both sides turned off, and only the lower lighting 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, to obtain a section of transparent particles and pure white and porcelain white particles.

[0021] Furthermore, the specific method for two-stage transparency sorting is as follows: a dual-lens conveyor color sorter is used for sorting. The upper illumination and upper background light are all turned off, while the lower illumination and lower background light are all turned on. The lower CCD array photoelectric sensor is used to identify the quartz particles during the parabolic falling process. The feeding speed is 2.8-3.0 m / s, the sorting air pressure is 0.7-0.8 MPa, the recognition sensitivity threshold is 120-180, and the spot threshold is 0-5, resulting in transparent quartz particle products and translucent quartz particle products.

[0022] Furthermore, 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.

[0023] Furthermore, the dark particles from step (5) are combined with the yellow particles from step (6) as a composite tailings, which can be used to manufacture foundry sand or machine-made sand.

[0024] The beneficial effects of this invention are:

[0025] This invention proposes a process method of "selective crushing and dissociation—scrubbing and washing—dehydration and classification—atomized dosing—surface modification—polishing and homogenization—machine vision-based sorting of coarse particles for pre-selection and tailings removal—screening of low-gas-liquid inclusion particles based on transparency differences—gradual utilization of raw material particles of different grades." For gas-liquid inclusions smaller than 5μm, direct color sorting and transparency beneficiation result in poor screening of small-diameter gas-liquid inclusion particles. This invention uses atomized dosing to precisely control the dosage and improve the uniformity of dosing. Surface modification uses a low-viscosity colorless reagent with a refractive index similar to that of quartz crystal particles, which can counteract the scattering phenomenon caused by air. The low-viscosity colorless solvent forms optical films with different anti-reflection effects on the particle surface, amplifying the differences in particle transparency characteristics and improving the identification accuracy of low-gas-liquid inclusion quartz raw materials.

[0026] This invention enables 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 based on particle sorting with differences in transparency, effectively reducing the pollution of high-quality quartz sand products after sand making by particles with high gas-liquid inclusion impurities.

[0027] This invention utilizes CCD machine vision for color and transparency difference sorting to achieve pre-selection and separation of coarse mineral impurity particles. By identifying environmental foreground and background light sources, and designing recognition sensitivity and spots, it facilitates the identification and automatic sorting of dark, pure white, porcelain white, semi-transparent, and transparent particles. It removes difficult-to-sort gas-liquid inclusion impurity particles, enabling the grading of raw materials of different grades and maximizing the protection and utilization of high-quality resources. This invention solves the technical problems of traditional manual sorting, such as narrow particle size range, low recognition accuracy, high labor intensity, low efficiency, and difficulty in industrial-scale production, thus improving resource utilization. This invention has significant reference value for establishing a quantitative evaluation system for the usability of high-purity quartz and guiding the classification and grading of high-purity quartz raw materials.

[0028] This invention can partially replace the inefficient and costly selective mining method, improving mining efficiency. It improves resource utilization by treating the boundaries and surrounding rocks of narrow-width, high-drainage veins, heterogeneous and homogeneous ore veins. It also allows for the extraction of high-purity quartz raw materials from quartz particles of varying transparency within heterogeneous ore veins, enabling the graded utilization of different resource grades. This invention shows promising application prospects in large-scale vein quartz resource bases in my country, including Donghai in Jiangsu, Dawu and Qichun in Hubei, Heyuan in Guangdong, and Shangluo in Shaanxi. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a process flow diagram of the screening method described in this invention;

[0031] Figure 2 Images of vein quartz ore;

[0032] Figure 3 Images of transparent quartz granule products;

[0033] Figure 4 Image of a translucent quartz granule product;

[0034] Figure 5 Images of tailings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, a method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions includes the following steps:

[0037] (1) The vein quartz ore was crushed and classified in two stages and one closed circuit to obtain -20+2mm particle material and -2mm particle size material.

[0038] (2) The 20+2mm particles are scrubbed and washed to remove the mineral mud and fragile particles with many cracks on the surface of the particles. 50-200g / t of water glass is added as a dispersant and cleaning agent during the scrubbing process.

[0039] (3) The granular material after step (2) is screened, graded, dehydrated and drained to obtain granular products of different narrow grades of -20+10mm, -10+5mm and -5+2mm. The surface of the granules is controlled to keep it moist and the moisture content is less than 5wt%.

[0040] (4) In step (3), different particle sizes are surface modified, kneaded and homogenized using a low-viscosity colorless solvent to form optical films with different anti-reflection effects on the particle surface, amplifying the differences in particle transparency characteristics and improving the identification accuracy of low-gas-liquid inclusion quartz raw materials; the low-viscosity colorless solvent is one or more of the following compatible solvents: water, ethanol, ethyl acetate, transformer oil, and low-viscosity silicone oil. Its main characteristics are low temperature viscosity coefficient, resistance to high and low temperatures, oxidation resistance, high flash point, low volatility, good insulation, low surface tension, non-corrosive to metals, and non-toxic. The amount of low-viscosity colorless solvent used is 1-6% of the dry weight of the particle product. The amount is adjusted according to the particle size, with the particle product being discrete and non-sticky.

[0041] (5) The modified products of different particle sizes after step (4) are sorted in one stage using a dual-lens conveyor belt color sorter. The specific method is as follows: the background light and foreground light on both sides are fully turned on. Under visible light irradiation, the sensitivity spot value is analyzed online using a CCD area array photoelectric sensor. The feeding speed is 2.8-3.2m / s, the sorting air pressure is 0.7-0.8MPa, and the dark particle waste with a sorting sensitivity threshold of 180 and a spot threshold of 30 is identified and sorted to remove dark mineral impurity particles such as biotite and chlorite, thus obtaining the first-stage sorted particles of different particle sizes.

[0042] Different particle sizes of the first-stage color-sorted particles are subjected to second-stage color sorting using a dual-lens conveyor color sorter. The specific method is as follows: the background light and foreground light on both sides are fully turned on. Under visible light illumination, a 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 yellow particle waste with a sensitivity threshold of 105 and a spot threshold of 25, yellow-skinned particles impregnated by iron-containing minerals are sorted out and removed, resulting in second-stage color-sorted quartz particles of different particle sizes. The yellow-skinned particles are combined with the dark-colored particle waste to obtain comprehensive tailings, which can be used to manufacture foundry sand or manufactured sand.

[0043] (6) Different particle sizes of two-stage color sorted quartz particles are sorted by transparency, specifically including first-stage transparency sorting and second-stage transparency sorting; the specific method of first-stage transparency sorting is as follows: a dual-lens conveyor color sorter is used, the upper side lighting and the upper and lower side background lights are all turned off, only the lower side 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, respectively obtaining first-stage transparent particles and all-white and porcelain white particles. First-stage transparent particles are high-brightness particles with better transparency;

[0044] The process involves two stages of transparency sorting for transparent quartz particles. The specific method is as follows: A dual-lens conveyor color sorter is used. The upper illumination and background light are completely turned off, while the lower illumination and background light are fully turned on. A lower CCD array photoelectric sensor is used to identify quartz particles falling parabolically. Light penetrates the transparent particles and partially penetrates the translucent mineral particles. The opaque parts of the particles generate signals on the background plate, which the sensor receives and reacts to, thus separating the translucent and transparent particles. The feeding speed is 2.8-3.0 m / s, the sorting air pressure is 0.7-0.8 MPa, the recognition sensitivity threshold is 120-180, and the spot threshold is 0-5, resulting in transparent and translucent quartz particle products.

[0045] Transparent quartz particles are purified by calcination, water quenching, sand making, gravity separation, magnetic separation, flotation, acid leaching, and roasting to obtain 4N75 high-purity quartz sand with a SiO2 content of 99.9975%. Semi-transparent quartz particles are purified by calcination, water quenching, sand making, gravity separation, magnetic separation, flotation, acid leaching, and roasting to obtain 4N grade high-purity quartz sand.

[0046] The specific implementation method is as follows:

[0047] The SiO2 grade of a certain vein quartz ore is 96.69%. Figure 2As shown, the minerals present include large pieces of epidote and other mineral impurities. Some fissures are stained yellow by iron minerals, and the original ore shows significant differences in transparency due to uneven mineralization. Using the vein quartz raw material screening method of this invention for preparing high-purity quartz sand with low gas-liquid inclusions, the vein quartz ore is first subjected to coarse crushing, medium crushing, and screening to obtain minerals of -20 to +2 mm particle size. The +20 mm particle size is returned to the medium crushing operation.

[0048] The -20+2mm particle size minerals were scrubbed, washed, screened, classified, dewatered, and drained to separate into three particle sizes: -20+10mm, -10+5mm, and -5+2mm. These were then subjected to surface modification, primary color sorting, secondary color sorting, primary transparency sorting, and secondary transparency sorting to obtain transparent quartz particles, translucent quartz particles, mixed tailings, and pure white and porcelain white particles. The -2mm particle size minerals and pure white and porcelain white particles were used as powder products. The transparent quartz particle products are as follows... Figure 3 As shown in Figure 4, the translucent quartz granule product is as shown in Figure 4, and the comprehensive tailings are as shown in Figure 4. Figure 5 As shown in Table 1, the beneficiation technical indicators for preparing high-purity quartz raw materials from vein quartz ore and for pre-tailing are shown in Table 1.

[0049] Table 1. Beneficiation Technical Indicators for Pre-selection and Tailings Disposal of Vein Quartz Ore

[0050]

[0051] Table 1 shows that the overall tailings yield was 3.90%, and the removal (recovery) rates of harmful mineral impurities such as Fe2O3 and Al2O3 were 55.22% and 61.23%, respectively, demonstrating a significant pre-selection tailings disposal effect. The yield of transparent quartz particles was 63.73%, with a SiO2 grade of 99.77%. After sand making, gravity separation, magnetic separation, flotation, and acid leaching purification, the SiO2 grade reached 99.9985%, yielding 4N85 grade high-purity quartz sand. The combined yield of semi-transparent quartz particle concentrate and powder products was 32.37%, with a SiO2 grade of 94.32%, which was used as a secondary raw material to achieve full resource-level utilization.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions, characterized in that, The following steps are involved: (1) The vein quartz ore was crushed and classified in two stages and one closed circuit to obtain -20+2mm particle material and -2mm particle size material. (2) The -20+2mm granular material is scrubbed and washed with water. During the scrubbing process, 50-200g / t of water glass is added as a dispersant and cleaning agent. (3) The granular material after step (2) is screened, graded, dehydrated and drained to obtain granular products of different sizes: -20+10mm, -10+5mm and -5+2mm. The surface of the granular products is kept moist and the moisture content is less than 5wt%. (4) The particle products of different particle sizes in step (3) are surface modified with a low-viscosity colorless agent and polished and homogenized. (5) The particle products of different sizes after modification in step (4) are sorted by color to remove dark particles and yellow particles that are stained by iron minerals, so as to obtain sorted quartz particles of different sizes. (6) Perform transparency sorting on the color-sorted quartz particles from step (5) to obtain all-white and porcelain-white particles, transparent quartz particle products and semi-transparent quartz particle products. The transparent quartz particle products and semi-transparent quartz particle products are high-purity quartz raw materials with low gas-liquid inclusion impurities.

2. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 1, characterized in that, In step (4), the amount of low-viscosity colorless agent is 1-6% of the dry weight of the granular product; the low-viscosity colorless agent is one or more of water, ethanol, ethyl acetate, transformer oil, low-viscosity silicone oil and oily dispersant.

3. A method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 1 or 2, characterized in that, In step (4), the low-viscosity colorless agent is added by atomization, and after the agent is added, the surface of the granular product is polished and homogenized by a kneader.

4. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 1, characterized in that, In step (5), the color sorting operation includes a first-stage color sorting and a second-stage color sorting. The first-stage color sorting removes dark-colored particles to obtain first-stage color sorted particles of different sizes. The first-stage color sorted particles of different sizes are then subjected to second-stage color sorting to remove yellow-skinned particles that are stained by iron-containing minerals, thus obtaining color sorted quartz particles of different sizes.

5. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 1, characterized in that, In step (6), the transparency sorting operation includes a first-stage transparency sorting and a second-stage transparency sorting. The color-sorted quartz particles undergo a first-stage transparency sorting to obtain first-stage transparent particles and pure white and porcelain white particles. The first-stage transparent particles undergo a second-stage transparency sorting to obtain transparent quartz particle products and semi-transparent quartz particle products.

6. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 4, characterized in that, The specific method for the first stage of color sorting is as follows: a dual-lens conveyor color sorter is used for color sorting, with the background light and foreground light on both sides fully turned on. Under visible light illumination, a 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. Dark particles with a sorting sensitivity threshold of 180 and a spot threshold of 30 are identified and removed to obtain the second stage of color sorted quartz particles.

7. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 4, characterized in that, The specific method for two-stage color sorting is as follows: a dual-lens conveyor color sorter is used for color sorting, with the background light and foreground light on both sides fully turned on. Under visible light illumination, a 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. Yellow-skinned particles with a sorting sensitivity threshold of 105 and a spot threshold of 25 are identified and removed to obtain two-stage color sorted quartz particles.

8. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 5, characterized in that, The specific method for sorting by transparency is as follows: a dual-lens conveyor color sorter is used for sorting. The upper lighting and the background lights on both sides are turned off, and 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, to obtain a section of transparent particles and pure white and porcelain white particles.

9. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 5, characterized in that, The specific method for two-stage transparency sorting is as follows: A dual-lens conveyor color sorter is used for sorting. The upper lighting and upper background light are all turned off, while the lower lighting and lower background light are all turned on. The lower CCD array photoelectric sensor is used to identify the quartz particles during the parabolic falling process. 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, resulting in transparent quartz particle products and translucent quartz particle products.

10. The method for screening vein quartz raw materials for preparing high-purity quartz sand with low gas-liquid inclusions according to claim 1, characterized in that, The -2mm particle size material in step (1) and the all-white and porcelain-white particles in step (6) are combined into a powder product, which can be used to prepare 3N photovoltaic quartz sand or fused quartz; the dark particles and yellow-skinned particles in step (5) are combined into a comprehensive tailings, which can be used to manufacture foundry sand or machine-made sand.

Images