An electronic-grade quartz sand impurity removal and purification device

Abstract

This invention relates to the field of quartz sand impurity removal and discloses an electronic-grade quartz sand impurity removal and purification device, comprising: a crushing module, an acid washing module, and a drying module arranged sequentially. The acid washing module includes an acid washing reactor and an acid washing tank. The acid washing reactor includes a reactor body with a feed inlet at the top and an acid discharge outlet and a sand discharge outlet at the bottom. The sand discharge outlet is connected to the inlet of the acid washing tank via a pipe. Control valves are installed at both the acid discharge outlet and the sand discharge outlet. The acid washing tank is equipped with a stirring mechanism, a sealing cover at the top with an inlet at the top, and a drain valve on one side of the bottom. A water circulation mechanism is also installed within the acid washing tank. This invention, through the cooperation of the water circulation mechanism and the stirring mechanism within the acid washing tank, achieves a more thorough acid washing of the acid-washed quartz sand particles, thereby minimizing the subsequent yellowing of the quartz sand.

Description

Technical Field

[0001] This invention relates to the field of quartz sand impurity removal, specifically to an electronic-grade quartz sand impurity removal and purification device. Background Technology

[0002] With the rapid development of emerging industries such as photovoltaic glass, semiconductor chips, and high-end ceramics, the demand for high-purity quartz sand is experiencing explosive growth. Industry data shows that the purity requirement for electronic-grade quartz sand has increased to over 99.999%. Acid leaching purification, as the core technology for quartz sand purification, has become a focus of the industry due to its superior impurity removal capabilities. The quartz sand acid leaching purification process utilizes acid to chemically react with impurities such as metal oxides and carbonates in the quartz sand, dissolving and removing these impurities.

[0003] The acid washing and purification process involves several intricate steps, and the general flow is as follows: First, pretreatment is performed, where the quartz sand is crushed and sieved to ensure uniform particle size, creating favorable conditions for subsequent acid washing. Next, the acid washing stage begins, where the quartz sand is immersed in a prepared acid solution. By controlling the acid concentration, temperature, and soaking time, the acid and impurities are allowed to react fully. After acid washing, a water washing operation is performed, where the quartz sand is repeatedly rinsed with a large amount of clean water to remove residual acid and dissolved impurities. Finally, drying is carried out using methods such as hot air drying or vacuum drying to bring the quartz sand to the required moisture content.

[0004] Acid leaching purification technology has significant advantages. First, it ensures high purity, significantly reducing the impurity content in quartz sand and meeting the stringent requirements of high-end industries for high-purity quartz sand. Second, it has wide applicability, capable of processing quartz sand raw materials with different grades and impurity compositions, providing enterprises with more raw material options. Third, it is highly efficient and energy-saving; compared to some traditional high-temperature smelting purification methods, acid leaching consumes less energy and has higher production efficiency. Fourth, it is environmentally friendly and controllable; through a complete wastewater treatment system, acidic wastewater generated during the acid leaching process can be neutralized, precipitated, and filtered to achieve compliant discharge and reduce environmental pollution.

[0005] However, existing quartz sand acid washing and purification equipment still has some shortcomings. For example, quartz sand turns yellow after acid washing, mainly due to the adhesion or retention of ferric compounds (such as Fe(OH)3 or Fe2O3·nH2O) on the particle surface or inside the particles. This is because the raw quartz sand itself has a high primary iron content, providing a material basis for yellowing. The key issue lies in the serious inadequacy of the post-acid washing treatment process. If the acid washing is incomplete, the residual iron-containing wastewater will experience "iron backflow" during the subsequent dehydration and drying process, i.e., Fe... 2+ Oxidized to Fe 3+ It hydrolyzes to form insoluble ferric hydroxide colloid, which adheres firmly to the surface of sand grains, forming yellow spots. Summary of the Invention

[0006] The purpose of this invention is to provide an electronic-grade quartz sand purification and impurity removal device to solve the above-mentioned technical problems.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] An electronic-grade quartz sand impurity removal and purification device includes: a controller, a crushing module, an acid washing module and a drying module arranged in sequence. The acid washing module includes an acid washing reactor and an acid washing tank. The acid washing reactor includes a reactor body. The top of the reactor body is provided with a feed inlet, and the bottom of the reactor body is provided with an acid discharge outlet and a sand discharge outlet. The sand discharge outlet is connected to the inlet of the acid washing tank through a pipeline. Control valves are provided at both the acid discharge outlet and the sand discharge outlet.

[0009] The acid washing tank is equipped with a stirring mechanism, an inlet at the top, a drain valve on one side of the bottom, and a water circulation mechanism.

[0010] Furthermore, the water circulation mechanism includes:

[0011] Multi-stage spray pipe assembly is installed at different heights on the inner wall of the acid washing tank. The multi-stage spray pipe assembly is connected to the deionized water source outside the acid washing tank through pumps and pipelines to provide continuously renewed cleaning water to the tank.

[0012] An ultrasonic transducer plate is embedded in the inner wall of the acid washing tank.

[0013] The pH online detector is installed on the inner wall of the acid washing tank, and the probe of the pH online detector is inserted into the washing water in the acid washing tank to monitor the acidity and alkalinity of the washing water in real time.

[0014] An inert gas inlet is located on the side wall of the acid washing tank and is connected to an inert gas source outside the acid washing tank. It is used to fill the acid washing tank with inert gas and maintain an inert atmosphere during the cleaning process.

[0015] Furthermore, the acid washing tank is equipped with multiple acid washing zones from top to bottom. Quartz sand is washed sequentially from top to bottom, and the washing water is circulated sequentially from bottom to top and sprayed out from the corresponding spray pipe group. Each acid washing zone is equipped with a sand outlet at the bottom and a water outlet on one side of the sand outlet. Both the water outlet and the sand outlet are equipped with control valves.

[0016] Furthermore, each acid washing zone is equipped with a stirring mechanism, which includes a drive motor, a stirring shaft, and blades. Multiple blades are provided and spaced apart on the stirring shaft. The stirring shaft is connected to the drive motor and is rotatably installed in the middle position of each acid washing zone. The rotational speed of the stirring shaft in each acid washing zone gradually decreases from top to bottom.

[0017] Furthermore, in addition to the bottom acid washing zone, each acid washing zone is equipped with an auxiliary mechanism to assist in stirring the dead corners of the acid washing zone.

[0018] Furthermore, the auxiliary mechanism includes: a rotating scraper installed on the inner wall of the acid washing zone, the rotating scraper being fixed to the stirring shaft by a bracket, the rotating scraper being made of flexible material, the edge of the rotating scraper being in contact with the inner wall of the acid washing zone or having a gap, used to scrape off the deposits attached to the inner wall of the acid washing zone and break the boundary layer of the wall surface.

[0019] Furthermore, the auxiliary mechanism also includes: an aeration pipe distributed at the bottom of the acid washing zone, which is connected to an external inert gas source through a pipeline; used to intermittently release bubbles from the bottom of the acid washing zone to agitate the quartz sand particles settled at the bottom, so that the quartz sand particles are resuspended in the washing water.

[0020] Furthermore, the auxiliary mechanism also includes a linkage component, which is used to link the stirring mechanism with the valve body installed on the inert gas inlet pipeline.

[0021] The linkage assembly includes: a drive gear, which is fixed on the stirring shaft; a driven gear meshes with the drive gear for transmission; a cam is fixed on the shaft of the driven gear; a valve body is installed on the inert gas inlet pipe; a baffle is slidably sealed inside the valve body; a push rod is fixed on the top of the baffle; a tension spring is installed between the push rod and the top wall of the valve body; a roller is rotatably installed on the push rod extending out of the valve body; the roller contacts the cam; and the baffle initially seals the inert gas inlet pipe.

[0022] When the drive motor starts and drives the stirring shaft to rotate, the cam is driven to rotate through gear meshing. The cam's protrusion periodically presses against the roller, overcoming the resistance of the tension spring, opening the inert gas inlet pipe, and opening the inert gas passage.

[0023] When the drive motor stops and the stirring shaft stops rotating, the cam stops at the reset angle, and the inert gas inlet pipe automatically closes under the action of the internal tension spring, cutting off the inert gas passage.

[0024] The beneficial effects of this invention are:

[0025] (1) By setting up a mechanical linkage component, the present invention realizes the pure mechanical linkage control between the stirring mechanism and the inert gas supply valve, which effectively solves the problem of asynchronous supply of protective gas due to failure of the electrical control system or human operation error. It makes the stirring operation and the establishment of the inert atmosphere completely synchronized. As soon as the stirring starts, the cam mechanism drives the valve to open the gas path; when the stirring stops, the tension spring immediately resets the baffle to cut off the gas path. This rigid interlocking mechanism fundamentally avoids the phenomenon of surface oxidation and yellowing of quartz sand due to exposure to oxygen environment during the stirring process, and improves the appearance quality and chemical stability of the product. At the same time, the on-demand supply mode greatly reduces the waste of high-purity inert gas and reduces production costs.

[0026] (2) This invention adopts a multi-stage acid washing tank structure that integrates ultrasonic vibrating plate, countercurrent spraying and mechanical stirring to form a multi-level, synergistic cleaning system, which improves the efficiency of impurity removal and eliminates cleaning dead corners; the cavitation effect of ultrasonic waves can effectively peel off stubborn iron scale and colloidal coatings on the surface of particles; the multi-stage countercurrent spraying utilizes the concentration difference principle to realize the tiered utilization of cleaning water and efficient directional mass transfer of impurities; the stirring mechanism set in different areas ensures the uniformity of the flow field; the three work together to overcome the limitations of a single cleaning method, especially to solve the problem of residue in the tank wall and bottom areas, ensuring the final cleaning purity of quartz sand and providing a reliable guarantee for the preparation of electronic-grade high-purity quartz sand. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is an overall layout diagram of the present invention;

[0029] Figure 2 This is a three-dimensional schematic diagram of the acid washing tank in this invention;

[0030] Figure 3 for Figure 2 Schematic diagram showing the location of the multi-stage spray pipe assembly;

[0031] Figure 4 This is a schematic diagram of the internal structure of the acid washing zone in this invention;

[0032] Figure 5 for Figure 4 A schematic diagram of the internal structure of the valve body.

[0033] Attached Figure Descriptions: 1. Crushing Module; 2. Pickling Reactor; 3. Acid Washing Tank; 4. Drying Module; 5. Water Circulation Mechanism; 51. Multi-stage Spray Pipe Assembly; 52. Pump; 53. Ultrasonic Vibrating Plate; 54. Inert Gas Inlet; 55. Acid Washing Zone; 551. Fine Washing Zone; 552. Rinsing Zone; 553. Initial Washing Zone; 56. Sand Outlet; 6. Stirring Mechanism; 61. Drive Motor; 62. Stirring Shaft; 63. Paddle; 7. Auxiliary Mechanism; 71. Rotating Scraper; 72. Support; 73. Aeration Pipe; 74. Linkage Components; 741. Valve Body; 742. Drive Gear; 743. Driven Gear; 744. Cam; 745. Baffle; 746. Push Rod; 747. Tension Spring; 748. Roller. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-5 As shown, the present invention is an electronic grade quartz sand impurity removal and purification device, including: a controller, a crushing module 1, an acid washing module and a drying module 4 arranged in sequence. The acid washing module includes an acid washing reactor 2 and an acid washing tank 3. The acid washing reactor 2 includes a reactor body. The top of the reactor body is provided with a feed inlet, and the bottom of the reactor body is provided with an acid discharge port and a sand discharge port. The sand discharge port is connected to the inlet of the acid washing tank 3 through a pipeline. Control valves are provided at both the acid discharge port and the sand discharge port.

[0036] The acid washing tank 3 is equipped with a stirring mechanism 6, an inlet at the top of the acid washing tank 3, a drain valve on one side of the bottom of the acid washing tank 3, and a water circulation mechanism 5.

[0037] Water circulation mechanism 5 includes:

[0038] Multi-stage spray pipe assembly 51 is installed at different heights on the inner wall of acid washing tank 3. The multi-stage spray pipe assembly 51 is connected to the deionized water source outside the acid washing tank 3 through pump 52 and pipeline to provide continuously renewed cleaning water to the tank.

[0039] The ultrasonic transducer plate 53 is installed at the bottom and inner wall of the acid washing tank 3 to generate high-frequency ultrasonic waves, which physically peel off the stubborn iron scale and colloidal particles attached to the surface of the quartz sand through the cavitation effect.

[0040] An online pH meter is installed on the inner wall of the acid washing tank 3, and the probe of the online pH meter is inserted into the washing water in the acid washing tank 3 to monitor the acidity and alkalinity of the washing water in real time.

[0041] An inert gas inlet 54 is located on the side wall of the acid washing tank 3 and is connected to an inert gas source outside the acid washing tank 3, such as nitrogen or argon, to fill the acid washing tank 3 with inert gas and maintain an inert atmosphere during the cleaning process.

[0042] The acid washing tank 3 has multiple acid washing zones 55 arranged from top to bottom. Quartz sand is washed sequentially from top to bottom, and the washing water is circulated sequentially from bottom to top and sprayed out from the corresponding spray pipe group. Each acid washing zone 55 has a sand outlet 56 at the bottom and a water outlet on one side of the sand outlet 56. Both the water outlet and the sand outlet 56 are equipped with control valves.

[0043] In this invention, to address the problem of quartz sand turning yellow during the acid washing process, a water circulation mechanism 5 is installed. After the quartz sand undergoes pretreatment, crushing, and acid washing, it promptly enters the acid washing tank 3. The water circulation mechanism 5 within the acid washing tank 3 circulates the acid-washed quartz sand from top to bottom. The multi-stage spray pipe assembly 51 provides a continuously updated supply of clean deionized water, achieving a counter-current cleaning principle, greatly improving cleaning efficiency and water usage efficiency, and ensuring that residual acid and iron ions are fully replaced and removed. The cavitation effect generated by the ultrasonic waves from the ultrasonic transducer 53 can penetrate the water film and directly act on the surface of the quartz sand particles, peeling away tiny rust colloids and inclusions that are difficult to remove with mechanical stirring, thus solving the problem of cleaning dead zones. Simultaneously, by filling the sealed acid washing tank 3 with nitrogen, oxygen is eliminated, fundamentally cutting off the Fe... 2+ Oxidized to Fe 3+ This prevents the formation of colloidal precipitates and eliminates yellowing caused by oxidation and hydrolysis at the source. Only when the cleaning water is detected to be neutral by an online pH meter is it allowed to be discharged into the drying module 4 for the next drying step.

[0044] Specifically, the acid washing tank 3 is divided into three zones from top to bottom, corresponding to three levels of spraying. The first-level spraying zone, the fine washing zone 551, is located at the bottom and is equipped with the first-level spray pipe, spraying the purest fresh deionized water. The second-level spraying zone, the rinsing zone 552, is located in the middle and is equipped with the second-level spray pipe, spraying the relatively clean circulating water that has undergone recycling treatment or the secondary water from the fine washing zone 551. The third-level spraying zone, the initial washing zone 553, is located at the top and is equipped with the third-level spray pipe, spraying the slightly contaminated water from the rinsing zone 552. At the same time, the acid washing tank 3 has a drain valve at the bottom and an overflow outlet at the top.

[0045] It should be noted that: the ultrasonic transducer 53 is set in the initial washing zone 553, the pH online detector is set at the bottom of the fine washing zone 551, and the inert gas inlet 54 is set in each acid washing zone 55.

[0046] During operation, the acid-washed quartz sand first enters the acid washing tank 3 through the top inlet, falling into the primary washing zone 553, also known as the three-stage spray zone. The quartz sand in the primary washing zone 553 is the dirtiest, with an extremely low pH and the highest Fe ion concentration. Its water source is the slightly contaminated water from the secondary rinsing zone 552, sprayed from the third-stage spray pipes. Although this water is not fresh, its acidity and iron content are far lower than the residual liquid on the sand surface. Utilizing this concentration difference, most of the high-concentration waste acid can be replaced. This process consumes a large amount of water, but because it uses slightly contaminated water from the rinsing zone 552, it saves fresh water. Subsequently, the quartz sand enters... In rinsing zone 552, the quartz sand particles undergo initial washing, reducing acidity but still not meeting standards. The water source is the second-stage spray pipe, which sprays secondary water used in the first-stage fine washing zone 551, further diluting and rinsing away the medium concentration of impurities remaining on the surface of the sand particles. The cleaning effect and efficiency are inevitably stronger than static soaking. Finally, the quartz sand particles enter the fine washing zone 551. At this point, the quartz sand particles are relatively clean and close to neutral. The water source is the first-stage spray pipe, which sprays fresh high-purity deionized water, and then the cleanest water is used for the final rinse to ensure that the residual trace ions are completely replaced, so that the quartz sand meets the final cleaning requirements.

[0047] In this process, the water flows in the opposite direction to the sand. Fresh deionized water is injected from the bottom primary washing zone 551. After washing the sand in the primary washing zone 551, this water becomes relatively clean secondary water and is pumped by pump 52 to the secondary spray pipe to rinse the sand in the secondary zone. After washing the secondary zone, the water becomes slightly polluted water and is then pumped to the tertiary spray pipe to pre-wash the dirtiest sand. Finally, in the tertiary primary washing zone 553, the wastewater, which has been reused multiple times and contains high concentrations of acid and iron ions, is discharged from the overflow outlet at the top of the acid washing tank 3. Through this counter-current multi-stage spray design, the dirtiest sand always encounters relatively dirty water, and the cleanest sand encounters the purest water, maintaining a large concentration difference. This is the driving force for impurities to diffuse from the sand surface into the water, resulting in the highest cleaning efficiency. At the same time, every drop of water undergoes multiple reuse processes of washing, rinsing, and primary washing before being discharged as wastewater, greatly reducing the consumption of fresh deionized water and achieving multiple benefits.

[0048] Each acid washing zone 55 is equipped with a stirring mechanism 6, which includes a drive motor 61, a stirring shaft 62, and blades 63. Multiple blades 63 are provided and spaced apart on the stirring shaft 62. The stirring shaft 62 is connected to the drive motor 61 through transmission. The stirring shaft 62 is rotatably installed in the middle position of each acid washing zone. The rotational speed of the stirring shaft 62 in each acid washing zone 55 gradually decreases from top to bottom.

[0049] In this invention, an adjustable-speed drive motor 61 drives the stirring shaft 62 to rotate, and the stirring shaft 62 drives the paddle 63 to rotate, thereby fully stirring the quartz sand particles in the entire acid washing zone 55, reducing the possibility of dead zones in acid washing. At the same time, since the cleanliness of the quartz sand particles gradually increases from top to bottom, the quartz sand particles at the top layer need a greater stirring speed to maximize mass transfer with the washing water, improve the gradient acid washing effect of the quartz sand particles, and thus minimize the risk of improper acid washing of quartz sand particles.

[0050] Except for the bottom acid washing zone 55, each acid washing zone 55 is equipped with an auxiliary mechanism 7, which is used to assist in stirring the dead corners of the acid washing zone 55.

[0051] The auxiliary mechanism 7 includes a rotating scraper 71 installed on the inner wall of the acid washing zone 55. The rotating scraper 71 is fixed to the stirring shaft 62 by a bracket 72. The rotating scraper 71 is made of a flexible material (such as a polytetrafluoroethylene strip). The edge of the rotating scraper 71 is in contact with the inner wall of the acid washing zone 55 or is provided with a gap, so as to scrape off the deposits attached to the inner wall of the acid washing zone 55 and destroy the wall boundary layer.

[0052] The auxiliary mechanism 7 further includes: an aeration pipe 73 distributed at the bottom of the acid washing zone 55, the aeration pipe 73 being connected to an external inert gas source through a pipeline; used to intermittently release bubbles from the bottom of the acid washing zone 55, agitating the quartz sand particles settled at the bottom, so that the quartz sand particles are resuspended in the washing water.

[0053] The auxiliary mechanism 7 also includes a linkage component 74, which is used to link the stirring mechanism 6 with the valve body 741 installed on the inert gas inlet 54 pipeline.

[0054] The linkage assembly 74 includes: a drive gear 742, which is fixed on the stirring shaft 62; a driven gear 743 meshes with the drive gear 742 for transmission; the two gears can be transmitted through an idler gear; a cam 744 is fixed on the shaft of the driven gear 743; a valve body 741 is installed on the inert gas inlet 54 pipeline; a baffle 745 is slidably sealed inside the valve body 741; a push rod 746 is fixed on the top of the baffle 745; a tension spring 747 is installed between the push rod 746 and the inner top wall of the valve body 741; a roller 748 is rotatably mounted on the push rod 746 extending out of the valve body 741; the roller 748 contacts the cam 744; the baffle 745 initially seals the inert gas inlet 54 pipeline; the driven gear 743 is rotatably mounted on the acid washing tank 3 via a rotating shaft.

[0055] When the drive motor 61 starts and drives the stirring shaft 62 to rotate, the cam 744 is driven to rotate through gear meshing. The protrusion of the cam 744 periodically presses against the roller 748, overcoming the resistance of the tension spring 747, opening the inert gas inlet 54 pipeline, and opening the inert gas passage.

[0056] When the drive motor 61 stops and the stirring shaft 62 stops rotating, the cam 744 stops at the reset angle, and the inert gas inlet 54 pipeline automatically closes under the action of the internal tension spring 747, cutting off the inert gas passage.

[0057] In this invention, the working process of the auxiliary mechanism 7 is as follows:

[0058] When a certain acid washing zone 55 needs to start cleaning operations, the drive motor 61 starts, driving the stirring shaft 62 of that zone to rotate. When the stirring shaft 62 rotates, the drive gear 742 fixed on it rotates accordingly, and drives the driven gear 743 meshing with it to rotate through gear meshing. The rotational motion of the driven gear 743 is transmitted to the cam 744 fixed on its shaft through the rotating shaft, so that the cam 744 starts to rotate synchronously. During the rotation of the cam 744, when its protrusion rotates to the position of contacting the roller 748, the cam 744 will press against the roller 748. The roller 748 transmits the force to the push rod 746. The push rod 746 overcomes the tension of the tension spring 747 and pushes the baffle 745 to slide in the valve body 741, thereby opening the channel of the inert gas inlet 54 pipeline. At this time, the external inert gas can be released to the bottom of the acid washing zone 55 through the open valve body 741 and the bottom aeration pipe 73, forming micro bubbles to agitate the deposited quartz sand.

[0059] As the cam 744 continues to rotate, when its protrusion moves away from the roller 748, the push rod 746 loses pressure. At this time, the rebound force of the tension spring 747 pulls the push rod 746 and the baffle 745 back to their original positions. The baffle 745 reseals the inert gas inlet 54 pipeline, and the gas supply is immediately interrupted. Therefore, as long as the drive motor 61 continues to run, the cam 744 will periodically press and release the roller 748, causing the inert gas valve body 741 to open and close at a high frequency and in a pulsed manner. This results in high-frequency pulsed aeration of the gas supply, leading to better aeration and improved mixing with stirring. The actions are completely synchronized: gas is supplied when stirring and stopped when stirring stops. When the cleaning operation of the acid washing zone 55 is completed and the drive motor 61 stops, the cam 744 stops at a certain fixed angle. No matter where the cam 744 stops, the baffle 745 will reliably reset and seal the gas pipeline under the action of the tension spring 747, completely cutting off the inert gas passage and avoiding any gas waste. Thus, the automatic and synchronous linkage between the stirring mechanism 6 and the inert gas supply is realized through the linkage component 74, ensuring the reliability of the process operation and effectively saving the consumption of inert gas.

[0060] Through the above technical solution, on the one hand, the pure mechanical transmission formed by gear meshing and cam 744 pressing directly converts the rotational power of the stirring mechanism 6 into mechanical energy to control the opening and closing of the inert gas inlet 54 pipeline. As long as stirring starts, the gas passage is opened accordingly; once stirring stops, the gas supply is immediately interrupted. This rigid interlocking mechanism fundamentally eliminates the risk of gas supply not being synchronized with process requirements due to circuit failure, program error, or sensor malfunction. It ensures that the protection of the inert atmosphere is always relatively synchronized with the stirring operation during the high-risk cleaning stage, greatly avoiding the problem of product oxidation and yellowing caused by the lack of protective gas. On the other hand, compared with the inevitable gas waste of traditional timed or manual gas supply methods, this invention realizes on-demand and precise pulsed gas supply through the linkage component 74. The duration and intensity of gas supply are completely bound to the stirring operation time, eliminating unnecessary waste. For production processes that continuously consume high-purity inert gas, it can reduce operating costs.

[0061] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An electronic grade quartz sand impurity removal purification apparatus comprising: The controller, the sequentially arranged crushing module, the pickling module and the drying module are characterized in that the pickling module comprises a pickling reactor and a pickling tank, the pickling reactor comprises a reactor body, the top of the reactor body is provided with a feeding port, the bottom of the reactor body is provided with an acid outlet and a sand outlet, the sand outlet is communicated with the inlet of the pickling tank through a pipeline, and control valves are arranged at the acid outlet and the sand outlet; The pickling tank is provided with a stirring mechanism, the top of the pickling tank is provided with an inlet, one side of the bottom of the pickling tank is provided with a drain valve, and the pickling tank is further provided with a water circulation mechanism; The water circulation mechanism comprises: A multi-stage spray pipe group is arranged at different heights of the inner wall of the pickling tank, the multi-stage spray pipe group is connected with a deionized water source outside the pickling tank through a pump and a pipeline, and is used for providing continuously updated cleaning water into the tank; An ultrasonic vibration plate is embedded and installed on the inner wall of the pickling tank; A pH on-line detector is arranged on the inner wall of the pickling tank, and the probe of the pH on-line detector is inserted into the cleaning water in the pickling tank, and is used for monitoring the pH of the cleaning water in real time; An inert gas inlet is arranged on the side wall of the pickling tank and is connected with an inert gas source outside the pickling tank, and is used for filling inert gas into the pickling tank to maintain an inert atmosphere during the cleaning process; In addition to the bottommost pickling area, an auxiliary mechanism is arranged in each pickling area, and the auxiliary mechanism is used for auxiliary stirring at the dead angle of the pickling area; The auxiliary mechanism comprises an aeration pipe arranged at the bottom of the pickling area; The auxiliary mechanism further comprises a linkage assembly, and the linkage assembly is used for linkage between the stirring mechanism and the valve body arranged on the inert gas inlet pipeline; The linkage assembly comprises a driving gear fixed on the stirring shaft, a driven gear in meshing transmission with the driving gear, and a cam fixed on the shaft of the driven gear; a valve body is arranged on the inert gas inlet pipeline, a baffle is slidably and sealingly connected in the valve body, a top rod is fixed on the top of the baffle, a tension spring is arranged between the top rod and the inner top wall of the valve body, a roller is rotatably arranged on the top rod extending out of the valve body, the roller is in contact with the cam, and the baffle seals the inert gas inlet pipeline in the initial state; When the driving motor is started and drives the stirring shaft to rotate, the cam is driven to rotate through gear meshing, the protruding part of the cam periodically presses the roller to overcome the resistance of the tension spring, opens the inert gas inlet pipeline, and makes the inert gas passage open; When the driving motor stops and the stirring shaft stops rotating, the cam stops at the reset angle, the inert gas inlet pipeline is automatically closed under the action of the internal tension spring, and the inert gas passage is cut off.

2. The electronic grade quartz sand impurity removal purification apparatus according to claim 1, characterized by, The pickling tank is provided with a plurality of pickling areas from top to bottom, the quartz sand is sequentially cleaned from top to bottom, the cleaning water is sequentially circulated from the corresponding spray pipe group from bottom to top, the bottom of each pickling area is provided with a sand outlet, one side of the sand outlet is provided with a water outlet, and control valves are arranged on the water outlet and the sand outlet.

3. The electronic grade quartz sand impurity removal purification apparatus according to claim 2, characterized by, Each pickling area is provided with one stirring mechanism, the stirring mechanism comprises a driving motor, a stirring shaft and paddles, the paddles are arranged on the stirring shaft and are spaced apart, the stirring shaft is in transmission connection with the driving motor, and the stirring shaft is rotatably arranged at the middle position of each pickling area; the rotating speed of the stirring shaft in each pickling area gradually decreases from top to bottom.

4. The electronic grade quartz sand impurity removal purification apparatus according to claim 3, characterized by, The auxiliary mechanism comprises a rotating scraper installed on the inner wall of the acid washing area, the rotating scraper is fixed between the stirring shaft and the support, the rotating scraper is made of flexible material, the edge of the rotating scraper is in contact with the inner wall of the acid washing area or has a gap, and the gap is used for scraping off the deposits attached to the inner wall of the acid washing area and destroying the boundary layer of the wall surface.

5. The electronic grade quartz sand impurity removal purification apparatus according to claim 4, characterized by, The aeration pipe is connected with an external inert gas source through a pipeline; the aeration pipe is used for intermittently releasing bubbles from the bottom of the acid washing area, stirring the quartz sand particles deposited at the bottom, and making the quartz sand particles resuspended in the cleaning water.

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