CN111153409B - Method for purifying quartz sand by utilizing microwave heating and ultrasonic-assisted acid leaching for iron removal - Google Patents
Method for purifying quartz sand by utilizing microwave heating and ultrasonic-assisted acid leaching for iron removal Download PDFInfo
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Abstract
The invention relates to a method for heating an impurity-containing phase in quartz at 400-1000 ℃ by using microwave heating to promote the phase change and cracking of the impurity-containing (Fe) phase and an adjacent quartz matrix, and then removing iron by using an ultrasonic-assisted acid leaching method. The method provided by the invention can realize ultra-efficient removal of iron impurities in the quartz sand, the minimum iron content can be reduced to below 0.383ppm by one-time removal, the maximum removal rate can reach above 99.87%, and the iron removal efficiency is far higher than that of other iron removal methods.
Description
Technical Field
The invention relates to the field of mineral purification, in particular to the technical field of quartz sand production, and relates to a method for purifying quartz sand by utilizing microwave heating and ultrasonic-assisted acid leaching for removing iron.
Background
The quartz sand mainly contains SiO 2 It is an important industrial raw material and widely used in the fields of glass, ceramics, refractory materials and the like. With the development of science and technology, the demand of high-purity quartz raw materials is increasing along with the increasing demand of quartz glass in the high-technology fields of semiconductors, optical fiber communication, aerospace, solar energy, electronics and the like. The natural quartz stone contains some impurity elements, wherein the existence of Fe directly influences the use value of quartz sand and reduces the quality of products. For example, quartz sand is used for a crucible for manufacturing a polysilicon ingot for a solar cell, and since a certain amount of Fe is contained in the quartz sand, after the polysilicon ingot is solidified and grown, fe in the quartz crucible diffuses from the quartz sand into the silicon ingot at a high temperature during slow cooling, a red region which cannot be used for manufacturing a solar cell sheet is formed in an edge region where the polysilicon ingot is in contact with the quartz crucible, so that the quality of the ingot is reduced, and therefore, the Fe content in the quartz sand needs to be as low as possible in many applications. Therefore, it is necessary to increase the efficiency of removing Fe as much as possible and to reduce the Fe content in the silica sand.
The method for removing Fe from quartz sand is divided into a physical method, a chemical method and a method integrating a plurality of means.
The physical methods comprise magnetic separation, color separation and the like, but only can remove magnetic or colored Fe-containing substances, and the Fe content in the quartz sand cannot be reduced to a very low level.
The chemical method is mainly an acid leaching method, and is divided into a single acid method and a mixed acid method, and researches show that the mixture of several acids can generate a synergistic effect in the reaction process, and the effect of the method is much better than that of the leaching of single acid. Veglio F, et al, leach iron from silica sand with a mixture of oxalic acid and sulfuric acid at 35-45% leaching rate (removal rate), while sulfuric acid alone, under the same conditions, only 3-9% (Leaching test in iron removal from quartz using oxidizing and subpluric acids, veglio F, passariello B., barbaro M., plesci P., marabini A.M. drive, int. J. Miner. Process 1998, 54, 183-200). Liu Chuan and the like treat quartz sand by a method combining alkali corrosion with sulfuric acid leaching to achieve the aim of removing iron (see 'development of high-purity quartz sand by a quartz gravel alkali corrosion method', liu Chuan and the like, resource investigation and environment 2006, 27 (7), 286-289). Because only part of Fe impurities in the quartz sand are positioned on the surface of the quartz sand, and part of Fe impurities are positioned in the quartz sand particles and cannot be contacted with acid liquor, the Fe content in the quartz sand cannot be reduced to a very low level by depending on an acid leaching method alone.
The method of comprehensive purification by adopting various means can obtain better purification effect than the purification by a single physical method or a chemical method. The main technological process comprises the steps of calcining, water quenching, crushing, magnetic separation, flotation, acid leaching, drying and the like. In patent application CN110510620A, quartz ore is calcined at 1050-1100 ℃ for 2-4hrs; then water quenching is carried out, and acid leaching is carried out by using mixed acid of oxalic acid and thiocyanic acid: fe in purified quartz sand 2 O 3 The content was 0.015% (150 ppm). In many similar patent applications and industrial practice, the calcination temperature of the quartz ore is typically 900-1100 ℃, and the acid leaching is carried out in a vessel at room temperature or under heating for a longer period of time, if the Fe content of the raw ore is high,by this process, the Fe content cannot be rapidly reduced to a very low level. Generally, a high calcining temperature is adopted, because the quartz material matrix can generate phase transformation at a high temperature, microcracks are generated after quenching treatment, the higher the treating temperature is, the more microcracks are generated after quenching, and therefore, the removal of impurities such as inclusions is facilitated, and in this respect, the higher the calcining temperature of the quartz material is, the removal of the impurities is facilitated. However, since the quartz sand has a relatively open crystal structure, particularly since the quartz has the phase transition of alpha quartz-beta quartz and the phase transition of quartz-tridymite at 573 ℃ and 870 ℃ respectively, after the quartz sand is converted into a high-temperature phase, the volume of the quartz matrix expands, the crystal structure is looser, and interstitial impurity atoms such as Fe can diffuse in the crystal lattice of the loosened quartz matrix at a higher speed. Fe is often enriched in a solid inclusion or a fluid inclusion such as feldspar, magnetite and a liquid inclusion in the form of an impurity phase in a quartz material, under the condition of high-temperature treatment, fe can diffuse from the impurity phase to a crystal lattice of a quartz matrix and enter the quartz crystal lattice, once Fe enters the crystal lattice of the quartz matrix, the Fe cannot be removed in an acid leaching manner because acid liquor cannot enter the quartz crystal lattice, so that the Fe cannot be removed in the crystal lattice due to diffusion from the impurity phase to the quartz matrix by adopting high-temperature calcination treatment on the quartz material, the Fe cannot be removed as crystal lattice Fe, and the removal rate of the impurity Fe in quartz sand is reduced, thereby limiting the application of high-temperature calcination and the improvement of calcination temperature. Moreover, the method of generating micro-cracks on the quartz matrix by means of high-temperature calcination and water quenching also has the problems of high energy consumption and complex operation.
With the development of science and technology, the purity requirement of quartz sand is higher and higher, how to remove Fe impurities in quartz sand quickly and efficiently becomes more and more important, and the existing technology is difficult to meet the requirement of removing Fe efficiently and quickly.
Disclosure of Invention
In order to solve the problems, the method of microwave heating and ultrasonic-assisted acid leaching is adopted to realize high-efficiency iron removal.
The invention is realized by the following technical scheme:
a method for iron removal and purification of quartz sand by microwave heating and ultrasound-assisted acid leaching, comprising the following steps:
(1) Heating quartz ore to a preset temperature by using microwaves, preserving heat for a certain time, and then closing the microwave power to cool the quartz ore to room temperature;
(2) Mechanically crushing the quartz ore subjected to the heating treatment in the step (1) to form quartz sand;
(3) Mixing the quartz sand sample obtained in the step (2) with an acidic solution to form ore pulp, putting the ore pulp into ultrasonic cleaning equipment, carrying out ultrasonic auxiliary acid leaching treatment at room temperature or under a heating condition, turning off the ultrasonic after the acid leaching treatment is finished, and naturally cooling the ore pulp to the room temperature;
(4) And (4) filtering and separating the quartz sand in the step (3) from the ore pulp, washing the quartz sand with deionized water until the pH value is close to neutral, and then putting the quartz sand into a clean container for drying to obtain a low-iron quartz sand product.
Wherein the quartz ore in the step (1) is a quartz ore with a particle size of more than 1mm and contains a large amount of SiO 2 The microwave heating temperature of the natural ore of the components is 400-1000 ℃, and the heat preservation time is 30-600min. Preferably, the microwave heating temperature in step (1) is 400-870 ℃. Further preferably, the microwave heating temperature in step (1) is 400-573 ℃.
Preferably, the acidic solution in step (3) is HNO 3 、H 2 SO 4 、HCl、HF、H 3 PO 4 、CH 3 COOH、C 2 H 2 O 4 The acid solution concentration can be adjusted according to the actual conditions: the solid/liquid ratio of the pulp is adjusted according to the situation.
The invention has the beneficial effects that:
the microwave has the characteristic of selective heating, the quartz sand matrix has weak capacity of absorbing microwave energy and cannot be effectively heated by the microwave, the Fe-containing impurity phase in the quartz sand can better absorb the energy of the microwave and can be quickly heated, due to the heat conduction effect, the quartz matrix adjacent to the iron-containing impurity can also reach higher temperature, the matrix far away from the impurity can still be maintained at relatively lower temperature, when the temperature of the quartz matrix exceeds the temperature of a phase change point, phase change can occur, the volume of the quartz matrix expands, and when the subsequent quenching is quickly cooled, the quartz matrix contracts, and in the cold and hot circulation, microcracks can be generated in the matrix around the impurity phase. Therefore, the quartz is heated by microwaves and cooled, so that the diffusion of Fe from impurities to a quartz matrix at high temperature can be well inhibited while the generation of microcracks near the impurities is promoted, the quartz ore subjected to microwave heating is mechanically crushed into quartz sand, and then acid liquor is promoted to enter the quartz sand along the microcracks under the assistance of ultrasonic waves through ultrasonic-assisted acid leaching to react with Fe-containing impurities so as to remove Fe after dissolution. The method realizes ultra-efficient removal of iron impurities in the quartz sand, the minimum iron content can be reduced to below 0.383ppm by one-time removal, the maximum removal rate can reach above 99.87%, and the iron removal efficiency is far higher than that of other iron removal methods.
Drawings
FIG. 1 is a process flow chart of the method for efficiently removing iron from quartz sand according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the invention.
Examples 1-4, the ore was heated to 400, 600, 800, 1000 ℃ by microwave heating, held for 1hr, the sample was cooled, the ore was taken out of the microwave heating apparatus, the quartz ore was crushed to 80-120 mesh by mechanical crushing, and then 2mol/L HNO was added 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. After the acid leaching is finished, cleaning and drying the quartz sand, and respectively reducing the Fe content of the obtained quartz sand from 284.876ppm of the quartz crude ore to: 0.383ppm, 2.063ppm, 6.823ppm and 8.410ppm, and the removal rates respectively reach 99.87 percent, 99.28 percent, 97.61 percent,97.05 percent. After the treatment of the steps, the content of Fe is greatly reduced, but the content of residual Fe is gradually increased along with the increase of the microwave heating temperature, and the removal rate of Fe is gradually reduced.
Example 5-8, heating the ore to 400 ℃ by microwave heating, keeping the temperature for 30, 45, 60, 600min, cooling the sample, taking out the ore from the microwave heating device, crushing the quartz ore to 80-120 meshes by a mechanical crushing method, and then using 2mol/L HNO 3 And ultrasonic acid leaching at 90 deg.c for 2 hr. After the acid leaching is finished, cleaning and drying the quartz sand, and respectively reducing the Fe content of the obtained quartz sand from 325ppm of the quartz raw ore to: 0.534ppm, 0.895ppm, 0.958ppm, 1.845ppm, the removal rate is respectively: 99.836%, 99.725%, 99.705% and 99.432%. After the treatment of the steps, the content of Fe is greatly reduced, but as the microwave heating time is increased, the content of residual Fe is gradually increased, and the removal rate of Fe is gradually reduced.
Examples 9 to 13, the ore was heated to 400 ℃ by microwave heating, the temperature was maintained for 30min, after the sample was cooled, the ore was taken out of the microwave heating apparatus, the quartz ore was crushed to 80 to 120 mesh by mechanical crushing, and then 2, 1, 2, 1mol/L CH was used for each of the samples 3 COOH、C 2 H 2 O 4 、HCl、H 3 PO 4 、H 2 SO 4 The resulting mixture was subjected to ultrasonic acid leaching at 90 ℃ for 2hrs. After the acid leaching is finished, cleaning and drying the quartz sand, and respectively reducing the Fe content of the obtained quartz sand from 325ppm of the quartz crude ore to: the removal rates of 10.016ppm, 1.838ppm, 6.370ppm, 8.880ppm and 5.921ppm are respectively as follows: 96.9%, 99.43%, 98.04%, 97.27% and 98.18%. By combining the example 5, it can be known that the content of Fe is greatly reduced after the above steps, and different kinds of acids have a significant effect of removing Fe in quartz sand.
In comparative example 1, the quartz sand treatment flow was similar to that of examples 1 to 4 except that the microwave heating temperature was further lowered to 200 ℃, and after the treatment, the residual Fe content in the quartz sand was lowered from 284.876ppm of the raw quartz ore to 24.630ppm, the removal rate was 91.36%, and the residual Fe content was significantly higher than that of examples 1 to 4.
In comparative example 2, in which the quartz ore was directly crushed without microwave heating treatment and then subjected to acid leaching treatment, the residual Fe content in the obtained quartz sand was reduced from 325ppm of the quartz raw ore to 51.234ppm, the removal rate was 84.236%, and the residual Fe content was significantly higher than that of the example.
In comparative example 3, the temperature was raised to 800 ℃ using a conventional resistance and maintained for 2hrs. Crushing quartz ore to 80-120 meshes by adopting a mechanical crushing method, and using 2mol/L HNO 3 When the sample is acid-soaked for 2hrs at 90 ℃, the Fe content of the obtained sample is reduced from 325ppm of the quartz crude ore to 81.126ppm, the removal rate is 75.038%, and the residual Fe content is greatly higher than that of the example.
In comparative example 4, the sample was cooled after heating to 400 ℃ with microwave and shortening the holding time to 15 min. Crushing quartz ore to 80-120 meshes by adopting a mechanical crushing method, and using 2mol/L HNO 3 When the sample is acid-soaked for 2hrs at 90 ℃, the Fe content of the obtained sample is reduced from 325ppm of the quartz crude ore to 15.859ppm, the removal rate is 95.120 percent, and the residual Fe content is greatly higher than that of the cases of examples 5-8.
The examples and comparative examples are as follows:
example 1
As shown in figure 1, quartz ore is placed in a microwave heating device, microwave is turned on, the quartz ore is heated to 400 deg.C, heat is preserved for 1hr, microwave is turned off, and the ore is naturally cooled. After cooling, the ore is taken out from the microwave heating device, the quartz ore is crushed to 80-120 meshes by adopting a mechanical crushing method, and then 2mol/L HNO is used 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. The Fe content of the obtained sample is reduced to 0.383ppm from 284.876ppm of the quartz raw ore, and the removal rate reaches 99.87%.
Example 2
Putting quartz ore into microwave heating device, turning on microwave, heating quartz ore to 600 deg.C, keeping the temperature for 1hr, turning off microwave, and naturally cooling. After cooling, the ore is taken out of the microwave heating device, the quartz ore is crushed to 80-120 meshes by adopting a mechanical crushing method, and then 2mol/L HNO is used 3 At 90 deg.CUltrasonic acid leaching for 2hrs. The Fe content of the obtained sample is reduced to 2.063ppm from 284.876ppm of the quartz raw ore, and the removal rate reaches 99.28%.
Example 3
Putting quartz ore into microwave heating device, turning on microwave, heating quartz ore to 800 deg.C, keeping the temperature for 1hr, turning off microwave, and naturally cooling the ore. After cooling, the ore is taken out of the microwave heating device, the quartz ore is crushed to 80-120 meshes by adopting a mechanical crushing method, and then 2mol/L HNO is used 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. The Fe content of the obtained sample is reduced to 6.823ppm from 284.876ppm of the quartz raw ore, and the removal rate reaches 97.61%.
Example 4
Putting quartz ore into microwave heating device, turning on microwave, heating quartz ore to 1000 deg.C, keeping the temperature for 1hr, turning off microwave, and naturally cooling ore. After cooling, the ore is taken out of the microwave heating device, the quartz ore is crushed to 80-120 meshes by adopting a mechanical crushing method, and then 2mol/L HNO is used 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. The Fe content of the obtained sample is reduced to 8.410ppm from 284.876ppm of the quartz raw ore, and the removal rate reaches 97.05 percent.
Example 5
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 30min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then using 2mol/L HNO 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 0.534ppm from 325ppm of the quartz crude ore, and the removal rate is 99.836%.
Example 6
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 45min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then using 2mol/L HNO 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. After the acid leaching is finished, the quartz sand is cleaned and dried, and the Fe content of the obtained quartz sand is reduced from 325ppm of the quartz crude ore to0.895ppm, the removal rate was 99.725%.
Example 7
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 60min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then using 2mol/L HNO 3 And ultrasonic acid leaching at 90 deg.c for 2 hr. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 0.958ppm from 325ppm of the quartz crude ore, and the removal rate is 99.705%.
Example 8
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 600min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then using 2mol/L HNO 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 1.845ppm from 325ppm of the quartz crude ore, and the removal rate is 99.432%.
Example 9
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 30min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then, using 2mol/L CH 3 The COOH was sonicated for 2hrs at 90 ℃. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 10.016ppm from 325ppm of the quartz raw ore, and the Fe removal rate is 96.9%.
Example 10
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 30min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then, using 1mol/L C 2 H 2 O 4 The resulting mixture was subjected to ultrasonic acid leaching at 90 ℃ for 2hrs. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 1.838ppm from 325ppm of the quartz crude ore, and the Fe removal rate is 99.43%.
Example 11
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 30min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then carrying out ultrasonic acid leaching for 2hrs at 90 ℃ by using 2mol/L HCl. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 6.370ppm from 325ppm of the quartz crude ore, and the Fe removal rate is 98.04%.
Example 12
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 30min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then using 1mol/L H 3 PO 4 The resulting mixture was subjected to ultrasonic acid leaching at 90 ℃ for 2hrs. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 8.880ppm from 325ppm of the quartz crude ore, and the Fe removal rate is 97.27%.
Example 13
Heating the ore to 400 ℃ by adopting microwave heating, preserving heat for 30min, taking out the ore from a microwave heating device after cooling the sample, crushing the quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then, using 1mol/L H 2 SO 4 Acid leaching with ultrasound at 90 deg.C for 2hrs. After the acid leaching is finished, the quartz sand is cleaned and dried, the Fe content of the obtained quartz sand is reduced to 5.921ppm from 325ppm of the quartz crude ore, and the Fe removal rate is 98.18%.
Comparative example 1
Putting quartz ore into microwave heating device, turning on microwave, heating quartz ore to 200 deg.C, keeping the temperature for 1hr, turning off microwave, and naturally cooling. After cooling, the ore is taken out of the microwave heating device, the quartz ore is crushed to 80-120 meshes by adopting a mechanical crushing method, and then 2mol/L HNO is used 3 And ultrasonic acid leaching at 90 deg.c for 2 hr. The Fe content of the obtained sample is reduced to 24.630ppm from 284.876ppm of the quartz raw ore, and the removal rate is 91.36%.
Comparative example 2
Crushing quartz ore to 80-120 meshes by adopting a mechanical crushing method, and then, using 2mol/L HNO 3 Acid-leaching at 90 ℃ for 2hrs. What is neededThe Fe content of the obtained sample is reduced to 51.234ppm from 325ppm of the quartz raw ore, and the removal rate is 84.236%.
Comparative example 3
Heating quartz ore to 800 deg.C by resistance, and maintaining the temperature for 2hrs. Crushing quartz ore to 80-120 meshes by adopting a mechanical crushing method, and using 2mol/L HNO 3 The sample obtained by acid leaching at 90 deg.C for 2hrs has Fe content reduced from 325ppm of quartz raw ore to 81.126ppm, and has a removal rate of 75.038%
Comparative example 4
Putting the quartz ore into a microwave heating device, turning on the microwave, heating the quartz ore to 400 ℃, preserving the heat for 15min, and turning off the microwave to naturally cool the ore. After cooling, the ore is taken out of the microwave heating device, the quartz ore is crushed to 80-120 meshes by adopting a mechanical crushing method, and then 2mol/L HNO is used 3 And ultrasonic acid leaching at 90 deg.C for 2hrs. The Fe content of the obtained sample is reduced to 15.859ppm from 325ppm of the quartz raw ore, and the removal rate is 95.120%.
In conclusion, the quartz ore is heated at 400-1000 ℃ by microwaves, then is prepared into quartz sand, and then is subjected to ultrasonic-assisted acid leaching, so that the ultra-high removal rate of Fe can be obtained, and the content of residual Fe can be reduced to a very low level.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (4)
1. A method for removing iron and purifying quartz sand by microwave heating and ultrasonic-assisted acid leaching is characterized by comprising the following steps:
(1) Heating quartz ore to a preset temperature by using microwaves, preserving heat for a certain time, and then closing the microwave power to cool the quartz ore to room temperature;
(2) Mechanically crushing the quartz ore subjected to the heating treatment in the step (1) to form quartz sand;
(3) Mixing the quartz sand sample obtained in the step (2) with an acidic solution to form ore pulp, putting the ore pulp into ultrasonic cleaning equipment, carrying out ultrasonic auxiliary acid leaching treatment at room temperature or under a heating condition, turning off the ultrasonic after the acid leaching treatment is finished, and naturally cooling the ore pulp to the room temperature;
(4) Filtering and separating the quartz sand in the step (3) from the ore pulp, washing the quartz sand with deionized water until the pH value is close to neutrality, and then putting the quartz sand into a clean container for drying to obtain a low-iron quartz sand product;
the microwave heating temperature in the step (1) is 400-600 ℃.
2. The method of claim 1, wherein: the quartz ore in the step (1) is a quartz ore with a particle size of more than 1mm and contains a large amount of SiO 2 The heat preservation time of the natural ore of the components is 30-600min.
3. The method of claim 1, wherein: the microwave heating temperature in the step (1) is 400-573 ℃.
4. The method of claim 1, wherein: the acidic solution in the step (3) is HNO 3 、H 2 SO 4 、HCl、HF、H 3 PO 4 、CH 3 COOH、C 2 H 2 O 4 One or a mixture of two or more of them and water.
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| CN111892059B (en) * | 2020-08-19 | 2023-04-25 | 昆明理工大学 | Preparation method of high-purity quartz sand |
| CN114436266A (en) * | 2022-01-28 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Method for purifying quartz by microwave heating chlorination roasting |
| CN115180624A (en) * | 2022-06-15 | 2022-10-14 | 新沂市中大石英科技有限公司 | Preparation treatment process for producing high-purity quartz sand |
| CN114988423A (en) * | 2022-06-27 | 2022-09-02 | 昆明理工大学 | Method for removing magnesium and purifying amorphous boron powder by microwave heating and ultrasonic-assisted acid leaching |
| CN115626650A (en) * | 2022-09-27 | 2023-01-20 | 贺州市旭鑫矿产品加工有限责任公司 | Quartz sand purification method |
| CN116272766B (en) * | 2023-05-18 | 2023-09-05 | 江苏泓顺硅基半导体科技有限公司 | Quartz sand purifying equipment |
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