CN117819556A - Method for preparing high-purity quartz with assistance of high-alkalinity activation - Google Patents

Abstract

The invention discloses a method for preparing high-purity quartz with the assistance of high alkalinity activation, which comprises the following steps: s1, carrying out high-temperature leaching on pretreated quartz sand in an acid solution; s2, calcining the quartz sand subjected to high-temperature acid leaching, and then performing water quenching and washing for later use; s3, mixing the calcined water quenched quartz sand with an alkali solution for hydrothermal reaction; s4, performing secondary high-temperature leaching on the quartz sand subjected to high-alkalinity activation in an acid solution to obtain high-purity quartz. According to the method, the calcined water quenching is used for enabling quartz sand to generate cracks, a channel of the quartz sand is opened, then high-strength alkali is used for activating the quartz sand, the crystal lattice structure of quartz is destroyed, impurities in crystal lattices are changed into free states which are easy to remove, and then the exposed crystal lattice impurities are removed by matching with high-temperature acid leaching, so that the aim of removing impurity elements, especially alkali metal sodium elements is achieved.

Description

A method for preparing high-purity quartz with high alkalinity activation assistance

Technical Field

The invention belongs to the technical field of high-purity quartz preparation, and in particular relates to a method for preparing high-purity quartz by high-alkalinity activation assistance.

Background technique

High-purity quartz is an irreplaceable mineral raw material for high-tech industries. It is processed into quartz glass and other related products and is widely used in the new generation of information industry, energy-saving and environmental protection industry, high-end equipment industry, biological industry, and new materials industry. Purity and different impurity contents are the core indicators that determine the application of high-purity quartz.

As one of the main alkali metal impurity elements in high-purity quartz, sodium often exists in quartz in the form of independent minerals, lattice impurities or inclusions such as albite and mica. It catalyzes the crystallization of quartz glass, affects the thermal stability and other thermal and optical properties of quartz glass, reduces the operating temperature and mechanical strength of quartz glass, and increases the dielectric constant and dielectric loss of quartz glass.

The main methods for purifying high-purity quartz include color sorting, scrubbing, gravity separation, magnetic separation, flotation, calcination, water quenching, acid leaching and other processes, which can remove almost all mineral impurities that exist as monomers. Hot-pressing acid leaching is an effective way to remove impurities that exist on the surface of particles or are embedded in particles in the form of inclusions in quartz. The content of impurity elements after impurity removal is at a low level, but gas-liquid inclusions and isomorphous impurities inside the lattice are difficult to remove. Chlorination roasting is the most important method for removing high-purity quartz lattice impurities, alkali metals and other interstitial atomic impurities. It is an effective means to remove the sodium content in high-purity quartz and a key technology for the deep purification of high-purity quartz. However, due to the high cost and harsh operating conditions of this method, it is rarely used industrially in China.

Based on the defects in the current high-purity quartz preparation method, it is necessary to improve it. There is an urgent need for a low-cost, effective, safe and environmentally friendly method to prepare high-purity quartz.

Summary of the invention

In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing high-purity quartz with the assistance of high-alkalinity activation, so as to solve the problems of low impurity removal rate, harsh process conditions and high cost in the existing quartz purification process.

To achieve the above object, the present invention is implemented through the following technical solutions:

A method for preparing high-purity quartz with the aid of high-alkalinity activation comprises the following steps:

S1. High temperature acid leaching: the pretreated quartz sand is leached in an acid solution at high temperature;

S2. Calcination and water quenching: The quartz sand after high temperature acid leaching is calcined, then water quenched, washed and set aside;

S3. High alkalinity activation: mixing the calcined water-quenched quartz sand with an alkaline solution for hydrothermal reaction;

S4. Secondary high-temperature acid leaching: The quartz sand activated with high alkalinity is subjected to secondary high-temperature leaching in an acidic solution to obtain high-purity quartz.

Preferably, in step S1, the pretreatment method of quartz sand includes: performing gravity separation, magnetic separation and flotation on the quartz sand in sequence.

Preferably, in step S1, the particle size of the quartz sand is 80-140 mesh.

Preferably, in step S1, the temperature of high temperature acid leaching is 180-220° C., and the leaching time is 3-5 hours.

Preferably, in step S1, the acidic solution is a mixed acid solution of hydrochloric acid, nitric acid and hydrofluoric acid or a single hydrofluoric acid solution.

Preferably, in step S2, the calcination temperature is 900-1100° C. and the calcination time is 2-3 hours.

Preferably, in step S3, the temperature of the hydrothermal reaction is 20-200° C., and the reaction time is 2-10 h.

Preferably, in step S3, the alkaline solution is one or more of KOH, NaOH, and LiOH.

Preferably, in step S3, the concentration of the alkaline solution is 0.3-0.5 mol/L, and the amount of quartz sand and alkaline solution is 2 g: (3-6) mL.

Preferably, the conditions of the secondary high-temperature acid leaching in step S4 are the same as those of the high-temperature acid leaching in step S1.

The beneficial effects of the present invention are:

The present invention first uses calcined water quenching to generate cracks in quartz sand and open the channels of quartz sand, then uses high-strength alkali to activate the quartz sand, destroys the lattice structure of quartz, and makes the impurities in the lattice become free states that are easy to remove, and then cooperates with high-temperature acid leaching to remove the exposed lattice impurities, thereby achieving the purpose of removing impurity elements, especially alkali metal sodium elements.

Compared with the common method of reducing alkali metal elements (such as chlorination roasting), the method of the present invention is simple to operate, can be carried out at a lower temperature, is safer, has less impact on equipment, and is easier to implement in industry.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

FIG1 is a schematic diagram showing the principle of a method for preparing high-purity quartz by high alkalinity activation assistance according to the present invention.

Detailed ways

The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Example 1

A method for preparing high-purity quartz with the aid of high-alkalinity activation is provided. The raw material used is a pebble ore sample from a certain area of Guangxi Zhuang Autonomous Region, and the impurity element content thereof is shown in Table 1.

Table 1 Impurity element content of Guangxi quartz sand ore samples

element Al Na Ti Ca K Fe Li Mn Mg Content/μg/g 130.66 73.61 5.66 88.51 19.92 53.72 1.46 1.03 43.48

The method for preparing high-purity quartz in this embodiment comprises the following steps:

Prepare raw materials: crush the quartz ore (crush to less than 5mm), acid soak (soak the crushed quartz ore in dilute hydrochloric acid at room temperature for 12 hours and then wash to neutral), grind (use a high-aluminum ball mill to grind the acid-soaked quartz sand in a closed circuit with a grinding concentration of 60%) to make quartz sand with a particle size of 80-140 mesh.

Quartz sand pretreatment: quartz sand is re-selected (grinded quartz sand is re-selected using a shaking table to separate heavy minerals from light minerals), magnetic separation (high gradient magnetic separator is used to magnetically separate the concentrate after re-selection, the magnetic separation intensity is 1.4T, and the number of magnetic separation stages is three), flotation operation (three stages of floating mica, the collector is dodecylamine, the total amount is 400g/t, the pH is 2-3; three stages of floating feldspar, the collector is commercially available HK-1, HK-2, the total amount is 800g/t, the pH is 1.5-2; one stage of floating iron-containing minerals, the collector is sodium petroleum sulfonate, the total amount is 200g/t, the pH is 2-3), to remove impurity minerals such as mica, feldspar and iron-containing minerals.

High temperature acid leaching: Use a mixed acid composed of 3 mol/L hydrochloric acid, 1 mol/L nitric acid and 1 mol/L hydrofluoric acid to leach the pretreated quartz sand at 200°C for 5 hours. After cooling, wash it to neutrality to preliminarily remove some impurity elements in the quartz sand.

Secondary flotation: The quartz sand after acid leaching is floated. The reagents used are commercially available HK-1 and HK-2, with a total dosage of 800g/t, a pH of 1.5-2, and two flotation stages. The quartz sand after flotation is washed, filtered, and dried for use.

Calcination and water quenching: The quartz sand obtained from the secondary flotation is placed in a crucible in a muffle furnace, calcined at 1000°C for 2 hours, and then immediately placed in the prepared deionized water for water quenching, washing, and standby use.

High alkalinity activation: Take 20g of calcined and water-quenched quartz sand and put it into a hydrothermal reactor lined with polytetrafluoroethylene, add 40mL of 0.5mol/L KOH solution, cover the reactor, and place it in a constant temperature oven at 40℃ for 4h. After the reaction is completed, wash it with deionized water until it is neutral, filter it, and dry it for later use.

Secondary high-temperature acid leaching: Using the same leaching conditions as the first high-temperature acid leaching, the quartz sand activated by alkaline leaching was leached at 200°C for 5 hours with a mixed acid of 3 mol/L hydrochloric acid, 1 mol/L nitric acid, and 1 mol/L hydrofluoric acid. After cooling, it was washed to neutrality to further remove impurity elements in the quartz sand and obtain high-purity quartz.

Example 2

A method for preparing high-purity quartz with the aid of high-alkalinity activation, wherein the raw materials used are the same as those in Example 1, except that the alkaline solution used for high-alkalinity activation is a NaOH solution. The method comprises the following steps:

Prepare raw materials: crush the quartz ore (crush to less than 5mm), acid soak (soak the crushed quartz ore in dilute hydrochloric acid at room temperature for 12 hours and then wash to neutral), grind (use a high-aluminum ball mill to grind the acid-soaked quartz sand in a closed circuit with a grinding concentration of 60%) to make quartz sand with a particle size of 80-140 mesh.

Quartz sand pretreatment: quartz sand is re-selected (grinded quartz sand is re-selected using a shaking table to separate heavy minerals from light minerals), magnetic separation (high gradient magnetic separator is used to magnetically separate the concentrate after re-selection, the magnetic separation intensity is 1.4T, and the number of magnetic separation stages is three), flotation operation (three stages of floating mica, the collector is dodecylamine, the total amount is 400g/t, the pH is 2-3; three stages of floating feldspar, the collector is commercially available HK-1, HK-2, the total amount is 800g/t, the pH is 1.5-2; one stage of floating iron-containing minerals, the collector is sodium petroleum sulfonate, the total amount is 200g/t, the pH is 2-3), to remove impurity minerals such as mica, feldspar and iron-containing minerals.

High temperature acid leaching: Use a mixed acid composed of 3 mol/L hydrochloric acid, 1 mol/L nitric acid and 1 mol/L hydrofluoric acid to leach the pretreated quartz sand at 200°C for 5 hours. After cooling, wash it to neutrality to preliminarily remove some impurity elements in the quartz sand.

Secondary flotation: The quartz sand after acid leaching is floated. The reagents used are commercially available HK-1 and HK-2, with a total dosage of 800g/t, a pH of 1.5-2, and two flotation stages. The quartz sand after flotation is washed, filtered, and dried for use.

Calcination and water quenching: The quartz sand obtained from the secondary flotation is placed in a crucible in a muffle furnace, calcined at 1000°C for 2 hours, and then immediately placed in the prepared deionized water for water quenching, washing, and standby use.

High alkalinity activation: Take 20g of calcined and water-quenched quartz sand and put it into a hydrothermal reactor lined with polytetrafluoroethylene, add 40mL of 0.5mol/L NaOH solution, cover the reactor, and place it in a constant temperature oven at 40℃ for 4h. After the reaction is completed, wash it with deionized water until it is neutral, filter it, and dry it for later use.

Secondary high-temperature acid leaching: Using the same leaching conditions as the first high-temperature acid leaching, the quartz sand activated by alkaline leaching was leached at 200°C for 5 hours with a mixed acid of 3 mol/L hydrochloric acid, 1 mol/L nitric acid, and 1 mol/L hydrofluoric acid. After cooling, it was washed to neutrality to further remove impurity elements in the quartz sand and obtain high-purity quartz.

Example 3

A method for preparing high-purity quartz with the aid of high-alkalinity activation, the raw materials and preparation method used are the same as those in Example 1, except that the alkaline solution used for high-alkalinity activation is LiOH solution.

Example 4

A method for preparing high-purity quartz with the assistance of high-alkalinity activation is basically the same as the preparation method of Example 1, except that the raw material used is a vein quartz ore sample from a certain area in Henan Province, and the impurity element content thereof is shown in Table 2.

Table 2 Impurity element content of Henan quartz sand ore samples

Comparative Example 1

High purity quartz was prepared by a method substantially the same as that in Example 1, except that the high basicity activation step used in Example 1 was performed before calcination and water quenching. The steps included:

Prepare raw materials: crush the quartz ore (crush to less than 5mm), acid soak (soak the crushed quartz ore in dilute hydrochloric acid at room temperature for 12 hours and then wash to neutral), grind (use a high-aluminum ball mill to grind the acid-soaked quartz sand in a closed circuit with a grinding concentration of 60%) to make quartz sand with a particle size of 80-140 mesh.

Quartz sand pretreatment: quartz sand is re-selected (grinded quartz sand is re-selected using a shaking table to separate heavy minerals from light minerals), magnetic separation (high gradient magnetic separator is used to magnetically separate the concentrate after re-selection, the magnetic separation intensity is 1.4T, and the number of magnetic separation stages is three), flotation operation (three stages of floating mica, the collector is dodecylamine, the total amount is 400g/t, the pH is 2-3; three stages of floating feldspar, the collector is commercially available HK-1, HK-2, the total amount is 800g/t, the pH is 1.5-2; one stage of floating iron-containing minerals, the collector is sodium petroleum sulfonate, the total amount is 200g/t, the pH is 2-3), to remove impurity minerals such as mica, feldspar and iron-containing minerals.

High temperature acid leaching: Use a mixed acid composed of 3 mol/L hydrochloric acid, 1 mol/L nitric acid and 1 mol/L hydrofluoric acid to leach the pretreated quartz sand at 200°C for 5 hours. After cooling, wash it to neutrality to preliminarily remove some impurity elements in the quartz sand.

Secondary flotation: The quartz sand after acid leaching is floated. The reagents used are commercially available HK-1 and HK-2, with a total dosage of 800g/t, a pH of 1.5-2, and two flotation stages. The quartz sand after flotation is washed, filtered, and dried for use.

High alkalinity activation: Take 20g of quartz sand obtained from secondary flotation and put it into a hydrothermal reactor lined with polytetrafluoroethylene, add 40mL of 0.5mol/L KOH solution, cover the reactor, and place it in a constant temperature oven at 40℃ for 4h. After the reaction is completed, wash it with deionized water until it is neutral, filter it, and dry it for later use.

Calcination and water quenching: Place the highly alkaline activated quartz sand in a crucible in a muffle furnace, calcine at 1000°C for 2 hours, then immediately place in the prepared deionized water for water quenching, washing, and set aside.

Second high-temperature acid leaching: Using the same leaching conditions as the first high-temperature acid leaching, the calcined water-quenched quartz sand was leached at 200°C for 5 hours with a mixed acid of 3 mol/L hydrochloric acid, 1 mol/L nitric acid, and 1 mol/L hydrofluoric acid. After cooling, it was washed to neutrality to further remove impurity elements in the quartz sand and obtain high-purity quartz.

Comparative Example 2

High purity quartz was prepared by a method substantially the same as that in Example 1, except that the preparation process of Comparative Example 2 did not include a high alkalinity activation step. The preparation steps are as follows:

Prepare raw materials: crush the quartz ore (crush to less than 5mm), acid soak (soak the crushed quartz ore in dilute hydrochloric acid at room temperature for 12 hours and then wash to neutral), grind (use a high-aluminum ball mill to grind the acid-soaked quartz sand in a closed circuit with a grinding concentration of 60%) to make quartz sand with a particle size of 80-140 mesh.

Quartz sand pretreatment: quartz sand is re-selected (grinded quartz sand is re-selected using a shaking table to separate heavy minerals from light minerals), magnetic separation (high gradient magnetic separator is used to magnetically separate the concentrate after re-selection, the magnetic separation intensity is 1.4T, and the number of magnetic separation stages is three), flotation operation (three stages of floating mica, the collector is dodecylamine, the total amount is 400g/t, the pH is 2-3; three stages of floating feldspar, the collector is commercially available HK-1, HK-2, the total amount is 800g/t, the pH is 1.5-2; one stage of floating iron-containing minerals, the collector is sodium petroleum sulfonate, the total amount is 200g/t, the pH is 2-3), to remove impurity minerals such as mica, feldspar and iron-containing minerals.

High temperature acid leaching: Use a mixed acid composed of 3 mol/L hydrochloric acid, 1 mol/L nitric acid and 1 mol/L hydrofluoric acid to leach the pretreated quartz sand at 200°C for 5 hours. After cooling, wash it to neutrality to preliminarily remove some impurity elements in the quartz sand.

Secondary flotation: The quartz sand after acid leaching is floated. The reagents used are commercially available HK-1 and HK-2, with a total dosage of 800g/t, a pH of 1.5-2, and two flotation stages. The quartz sand after flotation is washed, filtered, and dried for use.

Calcination and water quenching: The quartz sand obtained from the secondary flotation is placed in a crucible in a muffle furnace, calcined at 1000°C for 2 hours, and then immediately placed in the prepared deionized water for water quenching, washing, and standby use.

Second high-temperature acid leaching: Using the same leaching conditions as the first high-temperature acid leaching, the calcined water-quenched quartz sand was leached at 200°C for 5 hours with a mixed acid of 3 mol/L hydrochloric acid, 1 mol/L nitric acid, and 1 mol/L hydrofluoric acid. After cooling, it was washed to neutrality to further remove impurity elements in the quartz sand and obtain high-purity quartz.

Comparative Example 3

High-purity quartz was prepared by a method substantially the same as that in Example 1, except that the preparation process of Comparative Example 3 did not include the calcination and water quenching steps. The preparation steps are as follows:

Prepare raw materials: crush the quartz ore (crush to less than 5mm), acid soak (soak the crushed quartz ore in dilute hydrochloric acid at room temperature for 12 hours and then wash to neutral), grind (use a high-aluminum ball mill to grind the acid-soaked quartz sand in a closed circuit with a grinding concentration of 60%) to make quartz sand with a particle size of 80-140 mesh.

Quartz sand pretreatment: quartz sand is re-selected (grinded quartz sand is re-selected using a shaking table to separate heavy minerals from light minerals), magnetic separation (high gradient magnetic separator is used to magnetically separate the concentrate after re-selection, the magnetic separation intensity is 1.4T, and the number of magnetic separation stages is three), flotation operation (three stages of floating mica, the collector is dodecylamine, the total amount is 400g/t, the pH is 2-3; three stages of floating feldspar, the collector is commercially available HK-1, HK-2, the total amount is 800g/t, the pH is 1.5-2; one stage of floating iron-containing minerals, the collector is sodium petroleum sulfonate, the total amount is 200g/t, the pH is 2-3), to remove impurity minerals such as mica, feldspar and iron-containing minerals.

High temperature acid leaching: Use a mixed acid composed of 3 mol/L hydrochloric acid, 1 mol/L nitric acid and 1 mol/L hydrofluoric acid to leach the pretreated quartz sand at 200°C for 5 hours. After cooling, wash it to neutrality to preliminarily remove some impurity elements in the quartz sand.

Secondary flotation: The quartz sand after acid leaching is floated. The reagents used are commercially available HK-1 and HK-2, with a total dosage of 800g/t, a pH of 1.5-2, and two flotation stages. The quartz sand after flotation is washed, filtered, and dried for use.

High alkalinity activation: Take 20g of quartz sand after secondary flotation and put it into a hydrothermal reactor lined with polytetrafluoroethylene, add 40mL of 0.5mol/L KOH solution, cover the reactor, and place it in a constant temperature oven at 40℃ for 4h. After the reaction is completed, wash it with deionized water until it is neutral, filter it, and dry it for later use.

Secondary high-temperature acid leaching: Using the same leaching conditions as the first high-temperature acid leaching, the quartz sand activated by alkaline leaching was leached at 200°C for 5 hours with a mixed acid of 3 mol/L hydrochloric acid, 1 mol/L nitric acid, and 1 mol/L hydrofluoric acid. After cooling, it was washed to neutrality to further remove impurity elements in the quartz sand and obtain high-purity quartz.

Result analysis

The high-purity quartz concentrate obtained in the embodiment and the comparative example was subjected to ICPMS analysis and testing. The contents of various impurity elements in the quartz sand are shown in Table 3.

Table 3 Test results of various embodiments and comparative examples

It can be seen from the above table that the method for preparing high-purity quartz with the aid of high-alkalinity activation provided by the present invention can significantly reduce the content of impurity elements in quartz sand.

Compared with comparative example 1, embodiment 1 of the present invention is first calcined and water quenched and then activated by alkali leaching, which can have a better removal effect on impurity elements, especially alkali metal elements.

Compared with Comparative Example 2, Example 1 shows that the sodium content of the quartz sand activated by high alkalinity in the present invention is significantly reduced compared with the quartz sand not activated by high alkalinity, and the removal rate is about 50%, thereby achieving effective removal of the sodium element in high-purity quartz. In addition, other impurity elements are also partially reduced.

Compared with Comparative Example 3, the content of each impurity element in the prepared quartz product in Example 1 is significantly reduced, indicating that calcination and water quenching can cause cracks in the quartz sand, open the channels of the quartz sand, and promote the removal of impurities.

It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference may be made to the description in other embodiments.

As shown in FIG. 1 , taking sodium ions as an example, the present invention first uses calcined water quenching to create cracks in quartz sand to open the channels of the quartz sand, and then uses a high-strength alkali to activate the quartz sand to destroy the lattice structure of the quartz, so that the impurities in the lattice become free states that are easy to remove, and then cooperates with high-temperature acid leaching to remove the exposed lattice impurities, thereby achieving the purpose of removing impurity elements.

The above-mentioned embodiments only express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims (10)

1. A method for preparing high-purity quartz by high basicity activation, characterized in that it comprises the following steps: S1. High temperature acid leaching: the pretreated quartz sand is leached in an acid solution at high temperature; S2. Calcination and water quenching: The quartz sand after high temperature acid leaching is calcined, then water quenched, washed and set aside; S3. High alkalinity activation: mixing the calcined water-quenched quartz sand with an alkaline solution for hydrothermal reaction; S4. Secondary high-temperature acid leaching: The quartz sand activated with high alkalinity is subjected to secondary high-temperature leaching in an acidic solution to obtain high-purity quartz. 2. The method for preparing high-purity quartz with the assistance of high-alkalinity activation according to claim 1 is characterized in that in step S1, the pretreatment method of the quartz sand comprises: performing gravity separation, magnetic separation and flotation on the quartz sand in sequence. 3. The method for preparing high-purity quartz by high basicity activation according to claim 1, characterized in that in step S1, the particle size of the quartz sand is 80-140 mesh. 4. The method for preparing high-purity quartz with the aid of high-basicity activation according to claim 1, characterized in that in step S1, the temperature of the high-temperature acid leaching is 180-220°C, and the leaching time is 3-5 hours. 5. The method for preparing high-purity quartz with the aid of high-alkalinity activation according to claim 1, characterized in that in step S1, the acidic solution is a mixed acid solution of hydrochloric acid, nitric acid and hydrofluoric acid or a single hydrofluoric acid solution. 6. The method for preparing high-purity quartz with the aid of high-basicity activation according to claim 1, characterized in that in step S2, the calcination temperature is 900-1100°C and the calcination time is 2-3h. 7. The method for preparing high-purity quartz with the aid of high-basicity activation according to claim 1, characterized in that in step S3, the temperature of the hydrothermal reaction is 20-200°C and the reaction time is 2-10h. 8. The method for preparing high-purity quartz with the aid of high-alkalinity activation according to claim 1, characterized in that in step S3, the alkaline solution is one or more of KOH, NaOH, and LiOH. 9. The method for preparing high-purity quartz by high alkalinity activation as claimed in claim 1, characterized in that in step S3, the concentration of the alkaline solution is 0.3-0.5 mol/L, and the amount of the quartz sand and the alkaline solution is 2 g: (3-6) mL. 10. The method for preparing high-purity quartz with the aid of high-basicity activation according to claim 1, characterized in that the conditions of the secondary high-temperature acid leaching in step S4 are the same as those of the high-temperature acid leaching in step S1.