Energy-gathered electrode, preparation method and application thereof, and method for exploding and purifying quartz sand by using energy-gathered electrode

Abstract

The invention provides an energy-gathered electrode, a preparation method and application thereof, and a method for blasting and purifying quartz sand by using the energy-gathered electrode, and relates to the technical field of quartz sand purification. The energy-gathered electrode is obtained by calcining lanthanum oxide, vanadium oxide and tungsten oxide. The method for blasting and purifying the quartz sand by using the energy-gathered electrode device comprises the following steps: putting the quartz sand into the energy-gathered electrode device, focusing energy through an external power supply, and generating penetration and impact effects at the tip of an electrode to perform energy-gathered electrode blasting, so that impurities in the quartz sand are separated from a quartz matrix to obtain the high-purity quartz sand. Through the design of an energy-gathered electrode material, electric energy is concentrated to act on quartz lattices, directional shock waves are generated, and impurities are accurately split; and the method preferentially destroys the impurity binding force aiming at the physical property difference between the conductive impurities and the quartz, so that the quartz matrix is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of quartz sand purification, and in particular to an energy-gathering electrode and a preparation method and application thereof, and a method for purifying quartz sand by using the same for blasting. Background Art

[0002] Quartz sand is a common and widely used non-metallic mineral raw material in nature. High-purity quartz sand has performance advantages such as high temperature resistance, small thermal expansion coefficient, high insulation, and corrosion resistance. With the rapid development of science and technology, the application of quartz sand is no longer limited to traditional fields with low requirements for the purity of quartz sand, such as glass products and building materials. Instead, it increasingly involves high-tech industrial fields, such as large-scale and ultra-large-scale integrated circuits, optical fibers, lasers, military, and aerospace industries. However, these fields have strict requirements for the quality of quartz sand raw materials, requiring very low impurity content in quartz sand, especially extremely high requirements for the content of impurities such as Fe and Al. Therefore, the research on quartz sand purification technology is of great significance. Initially, high-purity quartz sand was obtained by processing first- and second-grade natural crystals. Due to the continuous growth of market demand in the past 30 years, natural crystal resources have gradually dried up, and alternative raw materials must be found. Purifying quartz sand to obtain high-purity quartz is an effective way to alleviate the shortage of natural crystal resources and meet the demand for high-quality quartz glass materials in the optical, semiconductor, and microelectronics industries.

[0003] There is a huge demand for high-purity quartz sand in fields such as semiconductors and optical fibers, but the deep removal of impurities (such as Fe, Al, alkali metals, etc.) in its crystal lattice is a technical difficulty.

[0004] The traditional quartz sand purification process flow is: water washing - acid leaching - roasting - water quenching - secondary acid leaching. In the traditional purification process, most gangue minerals and gas-liquid inclusions in the quartz raw material can be dissociated or destroyed and removed, but it is extremely difficult to remove lattice impurities. After acid leaching, the purification of this process has reached its limit. If the amount of hydrofluoric acid, which causes serious environmental pollution, is increased excessively, the temperature is raised, or the time is extended, it will only cause the overall dissolution of quartz minerals, reduce the concentrate yield, and cannot achieve a purification effect on the impurity elements in the crystal lattice. Therefore, for the purification of quartz raw materials with lattice impurity content, new deep purification processes need to be developed.

[0005] At present, the most effective method for removing lattice impurities is mainly the chlorination roasting process. Chlorination roasting, also known as chlorination degassing, utilizes the chemical potential gradient generated on the surface and inside of particles under the action of a high-concentration chlorinating agent to promote the diffusion of gas-liquid inclusions. There are significant differences in the action modes and effects of different chlorinating agents on lattice impurities. For example, when using different chlorinating agents such as dry hydrogen chloride (HCl), dry chlorine (Cl2), and a mixed gas of dry chlorine and hydrogen chloride (Cl2 / HCl) to carry out high-temperature chlorination purification of quartz sand, it shows that high-temperature chlorination treatment has obvious purification effects on Na, Fe, and K, but the removal effect of Al in the quartz sand lattice is very poor, and it also causes relatively serious pollution to the atmosphere and water bodies.

[0006] The use of traditional combined physical (such as flotation, calcination, etc.) and chemical (acid leaching) methods to refine high-purity quartz sand has become the current preference. However, problems such as difficult purity control, low efficiency, and serious environmental pollution generally exist during the refining process of quartz sand and urgently need to be solved. At the same time, existing physical methods (such as mechanical crushing) are difficult to accurately act on lattice impurities.

[0007] In view of this, the present invention is specifically proposed. Summary of the Invention

[0008] One of the purposes of the present invention is to provide an energy-gathering electrode. Through the design of the energy-gathering electrode material, the present invention focuses electric energy on the quartz lattice to generate a directional shock wave and precisely split impurities.

[0009] Another purpose of the present invention is to provide a preparation method for the energy-gathering electrode. The preparation method for the energy-gathering electrode includes: mixing lanthanum oxide, vanadium oxide, and tungsten oxide, placing them in a mold, and performing calcination to obtain the energy-gathering electrode.

[0010] A third purpose of the present invention is to provide an application of the energy-gathering electrode in purifying quartz sand by blasting as an energy-gathering electrode.

[0011] A fourth purpose of the present invention is to provide a method for purifying quartz sand by blasting using the energy-gathering electrode. The present invention uses the energy-gathering electrode of the present invention to purify quartz sand by blasting. In view of the physical property differences between impurities and quartz, especially conductive impurities, it preferentially destroys the binding force of impurities, avoids damage to the quartz matrix, selectively removes impurities, and the removal rate of impurities can reach more than 90%.

[0012] In order to achieve the above purposes of the present invention, the following technical solutions are specifically adopted:

[0013] In the first aspect, the present invention provides an energy-gathering electrode, which is obtained by calcining lanthanum oxide, vanadium oxide, and tungsten oxide.

[0014] Preferably, the mass ratio of lanthanum oxide, vanadium oxide and tungsten oxide is (0.1 - 2):(0.1 - 2):(7 - 9).

[0015] In a second aspect, the present invention provides a method for preparing the energy - concentrating electrode described above. The method for preparing the energy - concentrating electrode includes:

[0016] After mixing lanthanum oxide, vanadium oxide and tungsten oxide, place them in a mold and calcine to obtain the energy - concentrating electrode.

[0017] Preferably, the calcination temperature is 2000 - 2200 °C and the calcination time is 6 - 18 h.

[0018] In a third aspect, the present invention provides an application of the energy - concentrating electrode as described in the first aspect in purifying quartz sand by blasting as an energy - concentrating electrode.

[0019] In a fourth aspect, the present invention provides a method for purifying quartz sand by blasting with an energy - concentrating electrode. The method includes:

[0020] Place the quartz sand in an energy - concentrating electrode device, focus the energy through an external power supply, generate a penetration and impact effect at the tip of the electrode as described in the first aspect to conduct energy - concentrating electrode blasting, so that the impurities in the quartz sand are separated from the quartz matrix to obtain high - purity quartz sand.

[0021] Preferably, the quartz sand needs to be pretreated as follows before the energy - concentrating electrode blasting:

[0022] Crush the quartz ore to a particle size of less than 10 cm, and successively carry out water washing, drying and grinding to obtain quartz sand with a particle size of 60 - 180 mesh.

[0023] Preferably, during the energy - concentrating electrode blasting, the crystal form of quartz undergoes a transformation, and the crystal form of quartz changes from α - quartz to β - quartz.

[0024] Preferably, the energy of the energy - concentrating electrode for blasting is 3000 - 8000 V, and the time for the energy - concentrating electrode blasting is 10 - 60 s.

[0025] Preferably, the impurities include any one or a combination of at least two of aluminum oxide, iron(III) oxide, titanium dioxide, calcium oxide, magnesium oxide, potassium oxide or sodium oxide.

[0026] Preferably, the removal rate of the impurities is more than 90%;

[0027] Preferably, the purity of the high - purity quartz sand is more than 99.9500%.

[0028] Preferably, the high - purity quartz sand also needs to be post - treated as follows:

[0029] After discharging the separated impurities through the impurity channels in the energy-gathering electrode device, the high-purity quartz sand is collected.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The energy-gathering electrode of the present invention is obtained by calcining lanthanum oxide, vanadium oxide and tungsten oxide. Through the energy-gathering electrode material, electric energy is concentrated on the quartz lattice to generate a directional shock wave, thereby precisely splitting impurities.

[0032] (2) The present invention focuses energy through an external power source to generate a penetration and impact effect at the tip of the electrode for energy-gathering electrode blasting, separating the impurities in the quartz sand from the quartz matrix. In view of the physical property differences between conductive impurities and quartz, the binding force of the impurities is preferentially destroyed to avoid damage to the quartz matrix, thereby obtaining high-purity quartz sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a morphology diagram of the original quartz sand ore.

[0035] Figure 2 It is a morphology diagram of the quartz sand after energy-gathering electrode blasting provided in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0036] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meanings and scopes of the terms should be clear. However, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or extrinsic definition. In this application, unless otherwise specified, the use of "or" means "and / or". In addition, the use of the term "comprising" and other forms is non-limiting.

[0037] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] To achieve the above object of the present invention, the following technical solutions are specifically adopted:

[0040] In a first aspect, the present invention provides an energy-gathering electrode, which is obtained by calcining lanthanum oxide, vanadium oxide and tungsten oxide.

[0041] In the present invention, the energy-gathering electrode is obtained by calcining lanthanum oxide, vanadium oxide and tungsten oxide. Through the energy-gathering electrode material, electric energy is concentrated on the quartz lattice to generate a directional shock wave, thereby precisely splitting impurities.

[0042] As an optional implementation manner, the mass ratio of lanthanum oxide, vanadium oxide and tungsten oxide is (0.1-2):(0.1-2):(7-9);

[0043] Among them, lanthanum oxide: "0.1-2" can be, for example, 0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.6, 1.8, 2, etc.;

[0044] Among them, vanadium oxide: "0.1-2" can be, for example, 0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.6, 1.8, 2, etc.;

[0045] Among them, tungsten oxide: "7-9" can be, for example, 7, 7.2, 7.4, 7.5, 7.6, 7.8, 8, 8.2, 8.4, 8.5, 8.6, 8.8, 9, etc.

[0046] As a preferred implementation manner, the mass ratio of lanthanum oxide, vanadium oxide and tungsten oxide is 1:1:8.

[0047] In a second aspect, the present invention provides a preparation method of the energy-gathering electrode as described above. The preparation method of the energy-gathering electrode includes:

[0048] Mix lanthanum oxide, vanadium oxide and tungsten oxide, place them in a mold, and perform calcination to obtain the energy-gathering electrode.

[0049] As an alternative embodiment, the calcination temperature is 2000 - 2200 °C, for example, it can be 2000 °C, 2020 °C, 2040 °C, 2050 °C, 2060 °C, 2080 °C, 2100 °C, 2120 °C, 2140 °C, 2150 °C, 2160 °C, 2180 °C, 2200 °C, etc.

[0050] As an alternative embodiment, the calcination time is 6 - 18 h, for example, it can be 6 h, 6.5 h, 7 h, 7.5 h, 8 h, 8.5 h, 9 h, 9.5 h, 10 h, 10.5 h, 11 h, 11.5 h, 12 h, 12.5 h, 13 h, 13.5 h, 14 h, 14.5 h, 15 h, 15.5 h, 16 h, 16.5 h, 17 h, 17.5 h, 18 h, etc.

[0051] In a third aspect, the present invention provides an application of the energy - concentrating electrode as described in the first aspect in purifying quartz sand by blasting as an energy - concentrating electrode.

[0052] In the present invention, for the application of the energy - concentrating electrode as described in the first aspect in purifying quartz sand by blasting as an energy - concentrating electrode, the principle is that the electrode prepared from the novel electrode material, under the synergistic action of the novel electrolyte, can focus the electric quantity of the external power supply on a certain point of the electrode, thereby generating a powerful non - conductor penetration effect and impact action at a certain point of the electrode. Therefore, it is named the energy of the energy - concentrating electrode.

[0053] In a fourth aspect, the present invention provides a method for purifying quartz sand by blasting using an energy - concentrating electrode. The method includes:

[0054] Placing the quartz sand in an energy - concentrating electrode device, focusing energy through an external power supply, generating a penetration and impact action at the tip of the electrode as described in the first aspect for energy - concentrating electrode blasting, separating the impurities in the quartz sand from the quartz matrix, and obtaining high - purity quartz sand.

[0055] It should be noted that in the present invention, for the generation of the energy effect of the energy - concentrating electrode, under the powerful non - conductor penetration effect and impact action, it has a selective affinity for non - silicon - based impurities with better surface conductivity of quartz, so that this energy effect has a special stripping and removing effect on non - silicon - based impurities and silicon; similarly, the powerful non - conductor penetration effect and impact action also generate cracks and holes in the quartz inclusions and crystal lattice, resulting in the guiding, discharging, stripping, and removing of non - silicon - based impurities with better conductivity in the inclusions and crystal lattice; the organic impurities in the quartz are oxidized and decomposed into CO2 under the action of the powerful energy effect of the energy - concentrating electrode; the purified quartz is discharged from the defined channel in the energy - concentrating electrode device, and the impurities are excluded from the impurity channel in the energy - concentrating electrode device, thereby achieving the purpose of purifying quartz.

[0056] As an alternative embodiment, the quartz sand needs to be pretreated as follows before the shaped charge electrode blasting:

[0057] Crush the quartz ore to a particle size of less than 10 cm, and successively carry out water washing, drying and grinding to obtain quartz sand with a particle size of 60-180 mesh.

[0058] As an alternative embodiment, the quartz ore is crushed to a particle size of less than 10 cm, for example, it can be 10 cm, 9 cm, 8 cm, 7 cm, 6 cm, 5 cm, 4 cm, 3 cm, 2 cm, 1 cm, etc.

[0059] As an alternative embodiment, the particle size of the quartz sand obtained after grinding is 60-180 mesh, for example, it can be 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 180 mesh, etc.

[0060] As an alternative embodiment, during the shaped charge electrode blasting, the crystal form of the quartz changes, and the crystal form of the quartz changes from α-quartz to β-quartz.

[0061] It should be noted that the main metal impurities in the raw quartz ore are Fe, Al, Ca, K, Na, Ti, and Li, among which the Fe impurity content is the highest. These metal impurities mainly exist in impurity minerals such as hematite, muscovite, and apatite, and develop along microfractures. The occurrence inclusions are mainly in the form of gas-liquid two phases. In addition, the main component of the raw quartz ore is α-quartz. When the energy of the shaped charge electrode blasting is 3000-8000 V, the crystal form of the quartz can be changed from α-quartz to β-quartz, which provides a basis for the selection of the subsequent shaped charge electrode energy.

[0062] As an alternative embodiment, the energy of the shaped charge electrode blasting is 3000-8000 V, for example, it can be 3000 V, 3500 V, 4000 V, 4500 V, 5000 V, 5500 V, 6000 V, 6500 V, 7000 V, 7500 V, 8000 V, etc.

[0063] As an alternative embodiment, the time of the shaped charge electrode blasting is 10-60 s, for example, it can be 10 s, 15 s, 20 s, 25 s, 30 s, 35 s, 40 s, 45 s, 50 s, 55 s, 60 s, etc.

[0064] As an alternative embodiment, the impurities include any one or a combination of at least two of aluminum oxide, iron oxide, titanium dioxide, calcium oxide, magnesium oxide, potassium oxide or sodium oxide.

[0065] As a preferred embodiment, the impurities include aluminum oxide and / or iron oxide.

[0066] It should be noted that during the high-temperature oxidation process of the electrode point explosion caused by the energy effect of the shaped charge electrode, the activity of the impurities in the quartz increases, causing the divalent iron and aluminum ions inside the quartz to oxidize and increase in valence, resulting in charge imbalance. These ions with increased valence are thermodynamically very unstable and drive their diffusion to the quartz surface to form new minerals. At the same time, during the polymorphic transformation of quartz, channels for the diffusion of impurities such as iron and aluminum are opened. The powerful non-conductor penetration effect and impact promote the outward migration and enrichment of impurities such as iron, aluminum, and other metal impurities in the inclusions and lattice to the quartz surface.

[0067] As an alternative embodiment, the removal rate of the impurities is above 90%, for example, it can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.

[0068] As an alternative embodiment, the purity of the high-purity quartz sand is above 99.9500%, for example, it can be 99.9500%, 99.9550%, 99.9600%, 99.9650%, 99.9700%, 99.9750%, 99.9800%, 99.9850%, 99.9900%, 99.9910%, 99.9920%, 99.9930%, 99.9940%, 99.9950%, etc.

[0069] As an alternative embodiment, the high-purity quartz sand also needs to be post-treated as follows:

[0070] After discharging the separated impurities through the impurity channels in the shaped charge electrode device, the high-purity quartz sand is collected.

[0071] The present invention will be further described below through examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or directly purchased from the market.

[0072] Example 1

[0073] This example provides a shaped charge electrode, which is prepared by the following preparation method:

[0074] Lanthanum oxide, vanadium oxide, and tungsten oxide with a mass ratio of 1:1:8 are mixed and placed in a mold, and calcined at 2100 °C for 12 h to obtain the shaped charge electrode.

[0075] Example 2

[0076] This example provides a shaped charge electrode, which is prepared by the following preparation method:

[0077] After mixing lanthanum oxide, vanadium oxide, and tungsten oxide with a mass ratio of 0.4:0.6:9, place them in a mold and calcine at 2000 °C for 16 h to obtain the polyenergy electrode.

[0078] Example 3

[0079] This example provides a polyenergy electrode, which is obtained by the following preparation method:

[0080] After mixing lanthanum oxide, vanadium oxide, and tungsten oxide with a mass ratio of 1.6:1.4:7, place them in a mold and calcine at 2200 °C for 8 h to obtain the polyenergy electrode.

[0081] Test Example 1

[0082] Electrode performance test

[0083] Test samples: The polyenergy electrodes provided in Examples 1 to 3.

[0084] Test items: Test the maximum areal energy density and volumetric energy density of each sample electrode at an areal power density of 1.0 mW·cm -2 when it is.

[0085] The test results are shown in Table 1 below:

[0086] Table 1

[0087]

[0088] From the data in Table 1, it can be seen that the maximum instantaneous local polyenergy energy density of the polyenergy electrode obtained by calcining lanthanum oxide, vanadium oxide, and tungsten oxide provided by the present invention is 67000 mWh·cm -2 Above, the ratio of Example 1 is the optimal scheme, and its maximum areal energy density can reach 68000 mWh·cm -2 . Therefore, when electric energy acts on the quartz lattice intensively, a directional shock wave with a certain intensity can be generated, thereby accurately splitting impurities.

[0089] The chemical composition tables of the original quartz ore provided in the following application examples are shown in Table 2 below:

[0090] Table 2

[0091]

[0092]

[0093] Application Example 1

[0094] This application example provides a method for purifying quartz sand by using a polyenergy electrode, and the method includes the following steps:

[0095] (1) Pretreatment: The original quartz ore (as shown in Figure 1 ) is crushed to a particle size of less than 10 cm, and then washed, dried, and ground in sequence to obtain quartz sand with a particle size of 80 - 120 mesh.

[0096] (2) Shaped charge electrode blasting: The quartz sand with a particle size of 80 - 120 mesh is placed in the shaped charge electrode device, and energy is focused through an external power supply to generate a penetration and impact effect at the tip of the shaped charge electrode provided in Example 1 for shaped charge electrode blasting (5000 V, 30 s), so that the impurities in the quartz sand are separated from the quartz matrix to obtain a mixed powder containing high-purity quartz sand and impurities (as shown in Figure 2 ).

[0097] (3) Impurity separation: After discharging the separated impurities through the impurity channel in the shaped charge electrode device, the high-purity quartz sand is collected.

[0098] As shown in Figure 1 , the surface of the quartz ore without shaped charge electrode energy blasting treatment is roughly flat with regular quartz patterns, and there are also individual pits in addition, which are formed by the mutual extrusion of quartz ore during collection or transportation.

[0099] As shown in Figure 2 , after the quartz ore is treated by shaped charge electrode energy blasting, small cracks are generated. This is because during the shaped charge electrode energy blasting, quartz transforms from the α-crystalline form to the β-crystalline form, and the quartz matrix will expand with an expansion rate of about 4.5% due to the change in crystal form. And small and long cracks will be generated on the quartz surface, with a small number, the quartz surface is relatively flat, and quartz particles of different sizes are distributed.

[0100] Application Example 2

[0101] This application example provides a method for purifying quartz sand by shaped charge electrode blasting, and the method includes the following steps:

[0102] (1) Pretreatment: The original quartz ore is crushed to a particle size of less than 10 cm, and then washed, dried, and ground in sequence to obtain quartz sand with a particle size of 100 - 140 mesh.

[0103] (2) Shaped charge electrode blasting: The quartz sand with a particle size of 100 - 140 mesh is placed in the shaped charge electrode device, and energy is focused through an external power supply to generate a penetration and impact effect at the tip of the shaped charge electrode provided in Example 1 for shaped charge electrode blasting (4000 V, 20 s), so that the impurities in the quartz sand are separated from the quartz matrix to obtain a mixed powder containing high-purity quartz sand and impurities.

[0104] (3) Impurity separation: After discharging the separated impurities through the impurity channel in the shaped charge electrode device, the high-purity quartz sand is collected.

[0105] Application Example 3

[0106] This application example provides a method for purifying quartz sand by means of a shaped charge electrode explosion, and the method comprises the following steps:

[0107] (1) Pretreatment: The original quartz ore is crushed to a particle size of less than 10 cm, and is successively washed, dried and ground to obtain quartz sand with a particle size of 140 - 180 mesh.

[0108] (2) Shaped charge electrode explosion: The quartz sand with a particle size of 140 - 180 mesh is placed in a shaped charge electrode device, and the energy is focused through an external power supply to generate a penetration and impact effect at the tip of the shaped charge electrode provided in Example 1 for shaped charge electrode explosion (6000 V, 50 s), so that the impurities in the quartz sand are separated from the quartz matrix to obtain a mixed powder containing high-purity quartz sand and impurities.

[0109] (3) Impurity separation: After discharging the separated impurities through the impurity channel in the shaped charge electrode device, the high-purity quartz sand is collected.

[0110] Application Example 4

[0111] This application example provides a method for purifying quartz sand by means of a shaped charge electrode explosion. The difference from Application Example 1 is that the shaped charge electrode provided in Example 1 is replaced with the shaped charge electrode provided in Example 2, and the other steps are the same as those in Application Example 1.

[0112] Application Example 5

[0113] This application example provides a method for purifying quartz sand by means of a shaped charge electrode explosion. The difference from Application Example 1 is that the shaped charge electrode provided in Example 1 is replaced with the shaped charge electrode provided in Example 3, and the other steps are the same as those in Application Example 1.

[0114] Application Example 6

[0115] This application example provides a method for purifying quartz sand by means of a shaped charge electrode explosion. The difference from Application Example 1 is that the energy of the shaped charge electrode is 2000 V and the time of shaped charge electrode explosion is 10 min, and the other steps are the same as those in Application Example 1.

[0116] Application Example 7

[0117] This application example provides a method for purifying quartz sand by means of a shaped charge electrode explosion. The difference from Application Example 1 is that the energy of the shaped charge electrode is 10 kV and the time of shaped charge electrode explosion is 5 s, and the other steps are the same as those in Application Example 1.

[0118] Application Example 8

[0119] This application example provides a method for purifying quartz sand by using a shaped charge electrode explosion. The method includes the following steps:

[0120] (1) Pretreatment: Crush the original quartz ore (as shown) to obtain quartz sand with a particle size of less than 10 cm. Figure 1 as shown

[0121] (2) Shaped charge electrode explosion: Place the quartz sand with a particle size of less than 10 cm in a shaped charge electrode device, focus the energy through an external power supply, and generate a penetration and impact effect at the tip of the shaped charge electrode provided in Example 1 for shaped charge electrode explosion (4000 V, 20 s), so that the impurities in the quartz sand are separated from the quartz matrix, and a mixed powder containing high-purity quartz sand and impurities is obtained.

[0122] (3) Impurity separation: After discharging the separated impurities through the impurity channel in the shaped charge electrode device, collect the high-purity quartz sand.

[0123] Comparative Example 1

[0124] This comparative example provides a method for purifying quartz sand. The method for purifying quartz sand includes the following steps:

[0125] (1) Crush the original quartz ore to a particle size of less than 10 cm, and successively perform water washing, drying, and grinding to obtain quartz sand with a particle size of 80-120 mesh;

[0126] (2) Add a mixed acid solution with a mass fraction of 5 wt% to the quartz sand with a particle size of 80-120 mesh according to a liquid-solid ratio of 1:1. The mixed acid solution is prepared by mixing HCl and HF with a molar ratio of 1:1. Heat and stir at 60 °C for 2 h. After naturally cooling to room temperature, settle and separate to obtain a waste acid solution and first crude quartz; then add ultrapure water to the crude quartz sand and wash it until neutral, and then dry it to obtain second crude quartz;

[0127] (3) Heat the second crude quartz in a high-temperature resistance furnace with a crucible as a carrier to 500 °C and calcine for 1 h, then pour it into ultrapure water, wash and dry it to obtain third crude quartz; then perform a second pickling treatment according to the pickling step in the above step (2) to obtain high-purity quartz sand.

[0128] Comparative Example 2

[0129] This comparative example provides a method for purifying quartz sand. The method for purifying quartz sand includes the following steps:

[0130] (1) Crush the original quartz ore to a particle size of less than 10 cm, and successively perform water washing, drying, and grinding to obtain quartz sand with a particle size of 80-120 mesh;

[0131] (2) Put quartz sand with a particle size of 80 - 120 mesh into a chlorination furnace, then heat it to 900 °C and keep it for 1 h. Then introduce hydrogen chloride gas at a temperature of 1000 °C and keep it for 2 h to obtain high-purity quartz sand.

[0132] Test Example 2

[0133] Identification of Components of High-Purity Quartz Sand

[0134] Test Samples: High-purity quartz sand provided in Application Examples 1 - 8 and high-purity quartz sand provided in Comparative Examples 1 - 2.

[0135] The test results are shown in Tables 3 and 4 as follows:

[0136] Table 3

[0137] Serial number Oxide Application Example 1 Application Example 2 Application Example 3 Application Example 4 Application Example 5 1 Al (aluminum) (mg / kg) 17.15 23.25 44.89 17.54 18.01 2 Fe (iron) (mg / kg) 7.10 10.21 20.98 8.22 7.85 3 Ca (calcium) (mg / kg) 0.30 0.45 0.80 0.29 0.31 4 Mg (magnesium) (mg / kg) 0.32 0.48 0.60 0.30 0.32 5 K (potassium) (mg / kg) 15.15 29.30 39.00 16.01 14.96 6 Na (sodium) (mg / kg) 11.20 18.98 28.19 12.08 12.50 7 Ti (titanium) (mg / kg) 0.10 0.19 0.41 0.11 0.12 8 Co (cobalt) (mg / kg) 0.05 0.06 0.08 0.06 0.06 9 Cr (chromium) (mg / kg) 0.10 0.12 0.19 0.13 0.15 10 Cu (copper) (mg / kg) 0.03 0.04 0.05 0.04 0.05 11 Li (lithium) (mg / kg) 4.10 8.24 12.06 4.20 5.25 12 Mn (manganese) (mg / kg) 0.27 0.32 0.68 0.35 0.41 13 Ni (nickel) (mg / kg) 0.06 0.08 0.14 0.10 0.06 14 B (boron) (mg / kg) 0.25 0.31 0.62 0.26 0.28 15 Pb (lead) (mg / kg) 0.02 0.02 0.04 0.03 0.03 16 <![CDATA[SiO2 (Silicon Dioxide) (%)]]> 99.9913 99.9860 99.9770 99.9908 99.9906

[0138] Table 4

[0139]

[0140]

[0141] It can be seen from the data in Tables 3 and 4 that the method for purifying quartz sand by means of polyenergy electrode blasting in the present invention can reduce the content of Al2O3 in quartz sand to less than 0.01% and the content of Fe2O3 to less than 0.004%, and increase the content of SiO2 to more than 99.9500%. This fully shows that in the present invention, by focusing energy through an external power supply, a penetration and impact effect is generated at the tip of the electrode for polyenergy electrode blasting, so that the impurities in the quartz sand are separated from the quartz matrix. In view of the physical property differences between conductive impurities and quartz, the binding force of the impurities is preferentially destroyed to avoid damage to the quartz matrix, thereby obtaining high-purity quartz sand.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-gathering electrode, characterized in that: The energy-gathering electrode is obtained by calcining lanthanum oxide, vanadium oxide and tungsten oxide.

2. The energy-gathering electrode according to claim 1, characterized in that: The mass ratio of the lanthanum oxide, vanadium oxide and tungsten oxide is (0.1-2):(0.1-2):(7-9).

3. A method for preparing an energy-gathering electrode according to claim 1 or 2, characterized in that: The preparation method of the energy-gathering electrode comprises: Lanthanum oxide, vanadium oxide and tungsten oxide are mixed, placed in a mold, and calcined to obtain the energy-gathering electrode.

4. The method for preparing an energy-gathering electrode according to claim 3, characterized in that: The calcination temperature is 2000-2200° C., and the calcination time is 6-18 hours.

5. Use of the energy-gathering electrode according to claim 1 or 2 in purifying quartz sand by blasting as an energy-gathering electrode.

6. A method for purifying quartz sand by blasting with a focused electrode, characterized in that: The method comprises: Quartz sand is placed in an energy-focusing electrode device, and energy is focused by an external power source to produce penetration and impact at the tip of the electrode described in claim 1 or 2 to perform energy-focusing electrode blasting, so that impurities in the quartz sand are separated from the quartz matrix to obtain high-purity quartz sand.

7. The method for purifying quartz sand by using energy-gathering electrode blasting according to claim 6, characterized in that: The quartz sand needs to be pre-treated as follows before the energy-gathering electrode blasting: The quartz ore is crushed to a particle size of less than 10 cm, and then washed, dried and ground in sequence to obtain quartz sand with a particle size of 60 to 180 mesh.

8. The method for purifying quartz sand by using energy-focusing electrode blasting according to claim 6, characterized in that: During the blasting process of the energy-gathering electrode, the quartz undergoes a crystal transformation, and the crystal transformation of the quartz is from α-quartz to β-quartz; Preferably, the energy of the energy-gathering electrode during blasting is 3000-8000V, and the blasting time of the energy-gathering electrode is 10-60s.

9. The method for purifying quartz sand by using energy-focusing electrode blasting according to claim 6, characterized in that: The impurities include any one of aluminum oxide, iron oxide, titanium dioxide, calcium oxide, magnesium oxide, potassium oxide or sodium oxide, or a combination of at least two thereof; Preferably, the removal rate of impurities is above 90%; Preferably, the purity of the high-purity quartz sand is above 99.9500% based on silicon dioxide.

10. The method for purifying quartz sand by using energy-gathering electrode blasting according to claim 6, characterized in that: The high-purity quartz sand also needs to undergo the following post-treatment: After the separated impurities are discharged through the impurity channel in the energy-gathering electrode device, the high-purity quartz sand is collected.

Images