Low-loss high-purity quartz extraction method

Abstract

The invention discloses a low-loss high-purity quartz extraction method which comprises the following steps: magnetic separation, crushing, screening, color sorting, calcining, water quenching and sand making before magnetic separation, and reverse flotation and acid pickling after magnetic separation, the magnetic separator comprises a sample inlet, a conical magnetic separation slope connected below the sample inlet and a magnetic field generator arranged on the outer side of the conical magnetic separation slope, the conical magnetic separation slope is connected with a vibrator, the surface of the conical magnetic separation slope is a threaded flow control groove, an ore sand collecting container is arranged below the conical magnetic separation slope, and the ore sand collecting container comprises two semicircular grooves. According to the method, the purification process is optimized, reverse flotation reagents and conditions are reasonably selected, and equipment is improved, so that the purity of the high-purity quartz is improved, and the convenience of purification work is improved.

Description

Technical Field

[0001] This invention relates to the field of mineral purification technology, and in particular to a low-loss, high-purity quartz extraction method. Background Technology

[0002] High-purity quartz is a general term for quartz products with a SiO2 purity greater than 99.9%. It is the material basis for high-end products in the silicon industry, possessing characteristics such as good heat resistance, low coefficient of thermal expansion, acid and alkali resistance, stable performance, and high light transmittance. It has wide applications in aerospace, semiconductor, photovoltaic, and optical fiber technologies. With the development of science and technology, the requirements for quartz purity in various fields are constantly increasing. High-purity quartz has become one of the key materials restricting the development of these fields, especially high-purity quartz of 4N5 grade and above, which plays an important role in strategic emerging industries such as new materials and new energy.

[0003] Natural crystal, with its low impurity content, was the earliest raw material used to extract high-purity quartz. However, due to its small reserves and unstable chemical composition, standardized, large-scale production is difficult. To meet the production needs of high-purity quartz products, it is urgent to find other alternative resources for large-scale extraction of high-purity quartz sand. Granite pegmatites are widely distributed and have large deposits, mainly composed of feldspar, quartz, and mica. Their relatively simple composition, being a product of slow crystallization from volatile-rich molten lava, is conducive to the formation of large crystals and the precipitation of impurity elements. Furthermore, the quartz grains in granite pegmatites contain extremely low levels of fluid inclusions, far lower than those found in commonly used vein quartz in China, demonstrating excellent potential for extracting high-quality, low-hydroxyl, high-purity quartz sand.

[0004] The main impurity elements in high-purity quartz are Al, Fe, Ti, Ca, Mg, Na, Cu, Co, Mn, Ni, K, Li, and B. Extracting high-purity quartz from granite pegmatite requires a series of processing steps, usually including crushing and screening, calcination and water quenching, flotation, and acid leaching. However, most of these processes are cumbersome, costly, and the final high-purity quartz sand extracted is not very pure.

[0005] Application CN 115709999 A discloses a method for extracting high-purity quartz from granite pegmatite. The process is relatively simple, including: (1) calcination and water quenching; (2) crushing and screening; (3) positive flotation; and (4) acid washing to obtain quartz concentrate. This method does not use physical methods to screen out the separated feldspar, mica, and Fe-containing gangue minerals in advance. Instead, it mixes a large amount of gangue minerals with quartz-containing samples for calcination, water quenching, and flotation, which easily leads to a large amount of energy consumption and reagent waste. In addition, this method uses positive flotation to float the quartz phase to obtain quartz-enriched samples in order to reduce the amount of acid and alkali reagents used. However, this reduces the quartz acquisition rate, and the quartz and reagents will adsorb together, making the processing relatively complicated. Finally, the quartz concentrate after acid washing only reaches 3N6 or higher, and the purity of quartz is relatively low.

[0006] Application CN 115849393 A discloses a method for preparing high-purity quartz. The method includes the following steps: crushing granite pegmatite quartz ore to obtain first quartz particles with a diameter of 10-50 mm; pre-grinding and sieving the first quartz particles to obtain second quartz particles with a mesh size of less than 20 mesh and greater than 100 mesh; scrubbing and desliming the second quartz particles, followed by calcination and water quenching to obtain third quartz particles; grinding the third quartz particles to obtain fourth quartz particles with a mesh size of 100-200 mesh; and flotation, acid washing, water washing, and drying the fourth quartz particles to obtain high-purity quartz. This method improves the purity of the high-purity quartz by adding pretreatment to reduce the mechanical wear of traditional grinding mills. However, the entire preparation process is relatively complex and cumbersome. Like the previous method, it does not include a magnetic separation process to remove Fe-containing impurities. Therefore, the purity of the prepared high-purity quartz only reaches 3N or higher, failing to reach the 4N level. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a low-loss, high-purity quartz extraction method. By optimizing the purification process, rationally selecting reverse flotation reagents and conditions, and improving the equipment, not only is the purity of high-purity quartz improved, but the convenience of the purification work is also improved.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a low-loss, high-purity quartz extraction method, comprising the following steps:

[0009] S1. The raw ore is crushed and screened to obtain mineral particles that meet the particle size requirements;

[0010] S2. The mineral particles are initially purified by color sorting to obtain a mineral sample with a quartz content of more than 70%.

[0011] S3. Calcine and water quench mineral samples with a quartz content greater than 70% to expose inclusions and impurities in the quartz and fissures.

[0012] S4. The water-quenched ore sample is crushed and screened again to obtain ore sand;

[0013] S5. Perform magnetic separation on the ore sand;

[0014] S6. The magnetically separated ore sand is enriched with quartz by reverse flotation, and the enriched quartz sample is collected.

[0015] S7. The enriched quartz sample is acid-washed to obtain high-purity quartz concentrate.

[0016] As a preferred embodiment of the present invention, the raw ore is granite pegmatite with a quartz mineral content of 10%-30%; the particle size range of the ore obtained after crushing and screening in step S1 is 4-40 mesh; the crushing equipment in step S1 is a jaw crusher and the screening equipment is a vibrating screen.

[0017] As a preferred technical solution of the present invention, the calcination temperature in step S3 is 700-1100℃, the holding time is 0.5-3h, the calcination equipment is a high-temperature resistance furnace, and an extraction basket is placed inside the water quenching pool; after water quenching for 5 minutes, the mineral sample is placed in a dryer at 100℃ through the extraction basket to remove moisture, and the extraction basket is made of stainless steel.

[0018] As a preferred embodiment of the present invention, the particle size of the ore in step S4 is 50-140 mesh, and the crushing equipment in step S4 is a double roller mill.

[0019] As a preferred embodiment of the present invention, step S5 involves magnetic separation using a magnetic separator. The magnetic field strength during magnetic separation is 1.0-3.0T. The magnetic separator includes an inlet, a conical magnetic separation slope connected below the inlet, and a magnetic field generator disposed on the outside of the conical magnetic separation slope. The conical magnetic separation slope is connected to a vibrator, and the surface of the conical magnetic separation slope is a threaded flow control groove. Below the conical magnetic separation slope is a mineral sand collection container, which includes two semi-circular grooves. The magnetic field generator includes a conical shell parallel to the conical magnetic separation slope and an electromagnet disposed on the outside of the conical shell. The inlet is connected to the conical shell, and a support is connected to the bottom of the conical shell.

[0020] As a preferred technical solution of the present invention, in step S6, reverse flotation involves adjusting the pH of the pulp to 2-3 using 5% dilute sulfuric acid. The flotation reagents used include an activator and a collector. The activator is a mica and feldspar inhibitor, and the collector is a mica and feldspar collector.

[0021] As a preferred embodiment of the present invention, the activator is hydrofluoric acid, and the collector is a cationic collector such as dodecylamine or octadecylamine.

[0022] As a preferred embodiment of the present invention, the acid washing process in step S7 uses acid solutions including hydrofluoric acid, hydrochloric acid, sulfuric acid, and nitric acid, with the amount of hydrofluoric acid not exceeding 10% of the total amount of acid solution used; the solid-liquid ratio of the enriched quartz sample to the acid solution is 1:2-10; the acid leaching pressure is atmospheric pressure, the acid leaching time is 5-10 hours, and the acid leaching temperature is 50-90℃.

[0023] The beneficial effects of adopting the above technical solution are: (1) The present invention optimizes and improves the purification process, and integrates the first coarse crushing and screening, color sorting for preliminary purification, calcination and water quenching, the second further crushing and screening, magnetic separation, reverse flotation enrichment and the final acid washing process.

[0024] (2) Given the color difference among the components in granite pegmatite, a color sorting method is proposed to be added to the traditional process flow. Before flotation, the color difference between quartz sand and Fe impurities or quartz and mica minerals is used to remove feldspar, mica and gangue minerals containing Fe impurities from the raw ore. This not only reduces the energy consumption of calcination and the amount of reverse flotation reagent used, but also greatly improves the recovery rate of quartz minerals.

[0025] (3) The modified magnetic separator uses the method of vibrating and slowly descending the mineral sample instead of the free fall method of the existing magnetic separator, which ensures the effect of removing Fe-containing impurities from the sample and avoids the problem of incomplete removal caused by falling too fast and Fe-containing impurities sticking to the quartz sand.

[0026] This method has high purification efficiency and can extract high-purity quartz sand from granite pegmatite. The quartz sand has a high acquisition rate and purification rate, and the purification purity reaches 4N5 or higher, which belongs to the ultra-high purity quartz sand level. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a process flow diagram of the present invention;

[0029] Figure 2 This is a cross-sectional view of the magnetic separator of the present invention;

[0030] Figure 3 This is a top view of the ore collection container of the present invention;

[0031] In the diagram: 1. Sample inlet; 2. Conical magnetic separation slope; 3. Conical shell; 4. Electromagnet; 5. Threaded flow control groove; 6. Vibrator; 7. Mineral sand collection container; 8. Support. Detailed Implementation

[0032] See appendix Figure 1-3 The method for extracting high-purity quartz according to the present invention includes the following steps:

[0033] S1. The raw ore is crushed and screened to obtain mineral particles that meet the particle size requirements;

[0034] S2. The mineral particles are initially purified by color sorting to obtain a mineral sample with a quartz content of more than 70%.

[0035] S3. Calcine and water quench mineral samples with a quartz content greater than 70% to expose inclusions and impurities in the quartz and fissures.

[0036] S4. The water-quenched ore sample is crushed and screened again to obtain ore sand;

[0037] S5. Perform magnetic separation on the ore sand;

[0038] S6. The magnetically separated ore sand is enriched with quartz by reverse flotation, and the enriched quartz sample is collected.

[0039] S7. The enriched quartz sample is acid-washed to obtain high-purity quartz concentrate.

[0040] The raw ore is granite pegmatite with a quartz mineral content of 10%-30%; the particle size range of the ore obtained after crushing and screening in step S1 is 4-40 mesh; the crushing equipment in step S1 is a jaw crusher and the screening equipment is a vibrating screen.

[0041] The calcination temperature in step S3 is 700-1100℃, the holding time is 0.5-3h, the calcination equipment is a high-temperature resistance furnace, and an extraction basket is placed inside the water quenching pool; after water quenching for 5 minutes, the mineral sample is placed in a dryer at 100℃ through the extraction basket to remove moisture. The extraction basket is made of stainless steel.

[0042] The particle size of the ore in step S4 is 50-140 mesh, and the crushing equipment in step S4 is a double roller mill.

[0043] like Figure 2 and 3 As shown, step S5 involves magnetic separation using a magnetic separator. The magnetic field strength during magnetic separation is 1.0-3.0T. The magnetic separator includes an inlet, a conical magnetic separation slope connected below the inlet, and a magnetic field generator located outside the conical magnetic separation slope. The conical magnetic separation slope is connected to a vibrator, and its surface is a threaded flow control groove. Below the conical magnetic separation slope is a mineral sand collection container, which includes two semi-circular grooves. The magnetic field generator includes a conical shell parallel to the conical magnetic separation slope and an electromagnet located outside the conical shell. The inlet is connected to the conical shell, and a support is connected to the bottom of the conical shell.

[0044] In step S6, reverse flotation involves adjusting the pH of the pulp to 2-3 using 5% dilute sulfuric acid. The flotation reagents used include activators and collectors. The activators are mica and feldspar inhibitors, and the collectors are mica and feldspar collectors.

[0045] The activator is hydrofluoric acid, and the collector is a cationic collector such as dodecylamine or octadecylamine.

[0046] The acid pickling process in step S7 uses acid solutions including hydrofluoric acid, hydrochloric acid, sulfuric acid, and nitric acid. The amount of hydrofluoric acid used does not exceed 10% of the total amount of acid solution used. The solid-liquid ratio of the enriched quartz sample to the acid solution is 1:2-10. The acid leaching pressure is atmospheric pressure, the acid leaching time is 5-10 hours, and the acid leaching temperature is 50-90℃.

[0047] In the first embodiment:

[0048] Granite pegmatite from a certain region, containing approximately 35 wt% quartz, 60 wt% plagioclase, and 5 wt% muscovite, was subjected to the following treatment:

[0049] (1) The raw material is coarsely crushed by a large jaw crusher, then mediumly crushed by a small jaw crusher, and then screened by a vibrating screen to obtain a sample of 0.85mm~10.00mm.

[0050] (2) The samples with a diameter of 0.85 mm to 10.00 mm were sorted by a color sorter to obtain a sample rich in quartz (content of about 85 w%).

[0051] (3) Place the quartz-rich sample into a high-temperature resistance furnace and keep it at 900°C for 1 hour. Take out the calcined sample, quickly pour it into water for water quenching for 5 minutes, and then dry the sample at 100°C.

[0052] (4) The dried sample is crushed and sanded using a roller mill, and then sieved to obtain samples of different particle sizes;

[0053] (5) The 50-140 mesh sample obtained by sand preparation and sieving is magnetically separated to remove Fe impurities from the sample;

[0054] (6) Take 100g of the magnetically separated sample and add it to a 1L flotation cell. Add water to 1L and adjust the pH value to 2.2~3.8 with sulfuric acid. Use 1.5mol / l hydrofluoric acid as an activator and 0.05mol / l dodecylamine as a collector. Use reverse flotation to obtain quartz sample.

[0055] (7) The quartz-rich sample obtained by flotation was subjected to acid leaching with a mixed acid, wherein the concentration of sulfuric acid in the mixed acid was 3.7 mol / L and the concentration of hydrofluoric acid was 1.5 mol / L. The acid leaching conditions were as follows: the solid-liquid weight ratio of the quartz sample to the mixed acid was 1:6, and the leaching was carried out at 80°C under normal pressure for 8 hours to obtain quartz concentrate.

[0056] The recovery rate of quartz during flotation was 78.26%, and the recovery rate of quartz concentrate during acid leaching was 99.40%, resulting in a total recovery rate of 80.51% for the quartz concentrate in Example 1. The final quartz concentrate was subjected to ICP-OES testing, and the results are shown in Table 1. The table lists the main impurity elements; other elements are not listed. The impurity content of the quartz concentrate was 42.52 ppmw, and the purity reached 99.9957%, i.e., 4N57.

[0057] Table 1. ICP-OES test (ppm) of quartz concentrate in Example 1 Fe Ca Mg K Na Li Mn Ni Cu Al Ti B Cr ∑ Quartz concentrate 0.00 4.81 0.00 1.11 4.36 2.87 0.00 0.00 0.12 21.41 7.85 0.00 0.00 42.52

[0058] In the second embodiment:

[0059] This example uses granite pegmatite from a certain region, containing approximately 30 wt% quartz, 60 wt% plagioclase, and 10 wt% muscovite, and is processed as follows:

[0060] (1) The raw material is coarsely crushed by a large jaw crusher, then mediumly crushed by a small jaw crusher, and then screened by a vibrating screen to obtain a sample of 0.85mm~10.00mm.

[0061] (2) The samples with a diameter of 0.85 mm to 10.00 mm were sorted by a color sorter to obtain a sample rich in quartz (content of about 80 w%).

[0062] (3) Place the quartz-rich sample into a high-temperature resistance furnace and keep it at 900°C for 1 hour. Take out the calcined sample, quickly pour it into water for water quenching for 5 minutes, and then dry the sample at 100°C.

[0063] (4) The dried sample is crushed and sanded using a roller mill, and then sieved to obtain samples of different particle sizes;

[0064] (5) The 50-140 mesh sample obtained by sand preparation and sieving is magnetically separated to remove Fe impurities from the sample;

[0065] (6) Take 100g of the magnetically separated sample and add it to a 1L flotation cell. Add water to 1L and adjust the pH value to 2.2~3.8 with sulfuric acid. Use 1.5mol / l hydrofluoric acid as an activator and 0.05mol / l dodecylamine as a collector. Use reverse flotation to obtain quartz sample.

[0066] (7) The quartz-rich sample obtained by flotation was subjected to acid leaching with a mixed acid, wherein the concentration of sulfuric acid in the mixed acid was 3.7 mol / L and the concentration of hydrofluoric acid was 1.5 mol / L. The acid leaching conditions were as follows: the solid-liquid weight ratio of the quartz sample to the mixed acid was 1:6, and the leaching was carried out at 80°C under normal pressure for 8 hours to obtain quartz concentrate.

[0067] The recovery rate of quartz during flotation was 77.1%, and the recovery rate of quartz concentrate during acid leaching was 97.3%, resulting in a total recovery rate of 72.77% for the quartz concentrate in Example 2. The final quartz concentrate was subjected to ICP-OES testing, and the results are shown in Table 2. The table lists the main impurity elements; other elements are not listed. The impurity content of the quartz concentrate was 42.19 ppmw, with a purity of 99.9952%, i.e., 4N52.

[0068] Table 2. ICP-OES test (ppm) of quartz concentrate in Example 2 Fe Ca Mg K Na Li Mn Ni Cu Al Ti B Cr ∑ Quartz concentrate <0.01 5.82 0.05 0.21 6.26 2.59 0.10 <0.01 0.06 21.42 5.65 <0.01 <0.01 42.19

[0069] In the third embodiment:

[0070] This example uses granite pegmatite from a certain region, containing approximately 25 wt% quartz, 60 wt% plagioclase, 10 wt% potassium feldspar, and 5 wt% muscovite, and is treated as follows:

[0071] (1) The raw material is coarsely crushed by a large jaw crusher, then mediumly crushed by a small jaw crusher, and then screened by a vibrating screen to obtain a sample of 0.85mm~10.00mm.

[0072] (2) The samples with a diameter of 0.85 mm to 10.00 mm were sorted by a color sorter to obtain a sample rich in quartz (content of about 75 w%).

[0073] (3) Place the quartz-rich sample into a high-temperature resistance furnace and keep it at 900°C for 1 hour. Take out the calcined sample, quickly pour it into water for water quenching for 5 minutes, and then dry the sample at 100°C.

[0074] (4) The dried sample is crushed and sanded using a roller mill, and then sieved to obtain samples of different particle sizes;

[0075] (5) The 50-140 mesh sample obtained by sand preparation and sieving is magnetically separated to remove Fe impurities from the sample;

[0076] (6) Take 100g of the magnetically separated sample and add it to a 1L flotation cell. Add water to 1L and adjust the pH value to 2.2~3.8 with sulfuric acid. Use 1.5mol / l hydrofluoric acid as an activator and 0.05mol / l dodecylamine as a collector. Use reverse flotation to obtain quartz sample.

[0077] (7) The quartz-rich sample obtained by flotation was subjected to acid leaching with a mixed acid, wherein the concentration of sulfuric acid in the mixed acid was 3.7 mol / L and the concentration of hydrofluoric acid was 1.5 mol / L. The acid leaching conditions were as follows: the solid-liquid weight ratio of the quartz sample to the mixed acid was 1:6, and the leaching was carried out at 80°C under normal pressure for 8 hours to obtain quartz concentrate.

[0078] The recovery rate of quartz during flotation was 75.0%, and the recovery rate of quartz concentrate during acid leaching was 93.9%, resulting in a total recovery rate of 75.78% for the quartz concentrate in Example 3. The final quartz concentrate was subjected to ICP-OES testing, and the results are shown in Table 3. The table lists the main impurity elements; other elements are not listed. The impurity content of the quartz concentrate was 52.36 ppmw, and the purity reached 99.9948%, close to 4N5.

[0079] Table 3. ICP-OES test (ppm) of quartz concentrate in Example 3 Fe Ca Mg K Na Li Mn Ni Cu Al Ti B Cr ∑ Quartz concentrate 0.06 12.15 0.01 0.00 10.04 1.38 0.16 0.00 0.03 22.43 6.10 0.00 0.00 52.36

[0080] Comparative example:

[0081] This comparative example uses granite pegmatite from a certain region, containing approximately 35 wt% quartz, 60 wt% plagioclase, and 5 wt% muscovite, and was processed as follows:

[0082] (1) The raw material was coarsely crushed using a large jaw crusher to obtain a sample with a diameter of <50mm;

[0083] (2) Place the coarsely crushed sample into a high-temperature resistance furnace and keep it at 900°C for 1 hour. Take out the calcined sample, quickly pour it into water for water quenching for 5 minutes, and then dry the sample at 100°C.

[0084] (3) The calcined and water-quenched sample is crushed by a small jaw crusher, then sanded by a roller mill, and sieved to obtain a 50-140 mesh sample.

[0085] (4) Take 100g of the 50-140 mesh sample obtained by sand preparation and sieve and add it to a 1L flotation cell. Add water to 1L, adjust the pH value to 2.5~3.2 with sulfuric acid, use 1.5mol / l hydrofluoric acid as activator and 0.05mol / l dodecylamine as collector, and perform reverse flotation twice to obtain quartz sample.

[0086] (5) The quartz-rich sample obtained by flotation was subjected to acid leaching with a mixed acid, wherein the concentration of sulfuric acid in the mixed acid was 3.7 mol / L and the concentration of hydrofluoric acid was 1.5 mol / L. The acid leaching conditions were as follows: the solid-liquid weight ratio of the quartz sample to the mixed acid was 1:6, and the leaching was carried out at 80°C under normal pressure for 8 hours to obtain quartz concentrate.

[0087] The recovery rate of quartz during flotation was 50.97%, and the recovery rate of quartz concentrate during acid leaching was 97.50%, resulting in a total recovery rate of 70.37%. The final quartz concentrate was subjected to ICP-OES testing, and the results are shown in Table 4. The table lists the main impurity elements; other elements are not listed. The impurity content of the quartz concentrate was 113.0 ppmw, and the purity only reached 99.9887%, i.e., 3N8. Compared to Example 1, the quartz purity decreased significantly, and the flotation difficulty, reagent dosage, and waste liquor generated during the flotation process were significantly higher.

[0088] Table 4. ICP-OES test (ppm) of quartz concentrate in Comparative Example 1 Fe Ca Mg K Na Li Mn Ni Cu Al Ti B Cr ∑ Quartz concentrate 0.53 15.41 0.26 4.77 31.47 3.32 0.34 0.05 0.05 50.16 6.65 <0.01 <0.01 113.0

[0089] The above description is only presented as a possible technical solution of the present invention and is not intended as a single limitation on the technical solution itself.

Claims

1. A low-loss, high-purity quartz extraction method, characterized in that, The process includes magnetic separation, preceded by crushing, screening, color sorting, calcination, water quenching, and sand making. After magnetic separation, reverse flotation and acid washing are performed. Color sorting before magnetic separation can reduce calcination energy consumption and the amount of reverse flotation reagent used. The magnetic separation is performed by a magnetic separator, which includes an inlet, a conical magnetic separation slope connected below the inlet, and a magnetic field generator set outside the conical magnetic separation slope. The conical magnetic separation slope is connected to a vibrator, and the surface of the conical magnetic separation slope is a threaded flow control groove. Below the conical magnetic separation slope is a mineral sand collection container, which includes two semi-circular grooves.

2. The low-loss, high-purity quartz extraction method according to claim 1, characterized in that, The magnetic field strength during magnetic separation is 1.0-3.0T. The magnetic field generator includes a conical shell parallel to the conical magnetic separation slope and an electromagnet disposed on the outside of the conical shell. The sample inlet is connected to the conical shell, and a support is connected to the bottom of the conical shell.

3. The low-loss, high-purity quartz extraction method according to claim 1, characterized in that, The crushing and screening process involves crushing and screening granite pegmatite with a quartz mineral content of 10%-30% to obtain mineral particles that meet the particle size requirements; the particle size range of the mineral particles obtained after crushing and screening is 4-40 mesh; the crushing equipment is a jaw crusher and the screening equipment is a vibrating screen.

4. The low-loss, high-purity quartz extraction method according to claim 1, characterized in that, The color sorting process involves using a color sorter to preliminarily purify the crushed and screened mineral particles, reducing the interference of impurities on subsequent steps, and obtaining a mineral sample with a quartz content greater than 70%.

5. The low-loss, high-purity quartz extraction method according to claim 4, characterized in that, The calcination and water quenching are performed on mineral samples with a quartz content greater than 70% to expose inclusions and impurities in the quartz and fissures.

6. The low-loss, high-purity quartz extraction method according to claim 5, characterized in that, The calcination temperature is 700-1100℃, the holding time is 0.5-3h, the calcination equipment is a high-temperature resistance furnace, and an extraction basket is placed inside the water quenching pool; after water quenching for 5 minutes, the mineral sample is placed in a dryer at 100℃ through the extraction basket to remove moisture. The extraction basket is made of stainless steel.

7. The low-loss, high-purity quartz extraction method according to claim 1, characterized in that, The sand making process involves further crushing and screening of the water-quenched ore sample to obtain ore sand with a particle size of 50-140 mesh. The crushing equipment used for sand making is a double roller mill.

8. The low-loss, high-purity quartz extraction method according to claim 1, characterized in that, The reverse flotation refers to the process of enriching quartz in the magnetically separated ore sand through reverse flotation, combining it with impurities present in smaller quantities, and collecting the enriched quartz sample.

9. The low-loss, high-purity quartz extraction method according to claim 8, characterized in that, The reverse flotation process involves adjusting the pH of the pulp to 2-3 using 5% dilute sulfuric acid. The flotation reagents used include an activator and a collector. The activator is a mica and feldspar inhibitor, and the collector is a mica and feldspar collector. The activator is hydrofluoric acid, and the collector is a dodecylamine and octadecylamine cationic collector.

10. The low-loss, high-purity quartz extraction method according to claim 8, characterized in that, The acid leaching process involves acid leaching the enriched quartz sample to obtain high-purity quartz concentrate. The acid leaching process uses acid solutions including hydrofluoric acid, hydrochloric acid, sulfuric acid, and nitric acid, with the amount of hydrofluoric acid not exceeding 10% of the total acid solution volume. The solid-liquid ratio of the enriched quartz sample to the acid solution is 1:2-10. The acid leaching gas pressure is atmospheric pressure, the acid leaching time is 5-10 hours, and the acid leaching temperature is 50-90℃.

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