Electronic grade quartz sand impurity removal and purification equipment

Abstract

The invention relates to the field of quartz sand impurity removal, and discloses electronic grade quartz sand impurity removal and purification equipment which comprises a crushing module, an acid pickling module and a drying module which are sequentially arranged, the acid pickling module comprises an acid pickling reaction kettle and an acid pickling pool, the acid pickling reaction kettle comprises a kettle body, and a feeding port is formed in the top of the kettle body; an acid discharge port and a sand discharge port are formed in the bottom of the kettle body, the sand discharge port is communicated with an inlet of the acid washing pool through a pipeline, and control valves are arranged at the acid discharge port and the sand discharge port; a stirring mechanism is arranged in the acid washing pool, a sealing cover is arranged at the top of the acid washing pool, an inlet is formed in the top of the sealing cover, a drainage valve is arranged on one side of the bottom of the acid washing pool, and a water circulation mechanism is further arranged in the acid washing pool. Through cooperation of the water circulation mechanism and the stirring mechanism in the acid washing pool, more thorough acid washing is carried out on quartz sand particles subjected to acid washing, and the problem that quartz sand becomes yellow subsequently is avoided as much as possible.

Description

TECHNICAL FIELD

[0001] The application relates to the field of impurity removal of quartz sand, and particularly relates to a purification equipment for removing impurities from electronic-grade quartz sand. BACKGROUND

[0002] In the high-speed development of emerging industries such as photovoltaic glass, semiconductor chips and high-end ceramics, the demand for high-purity quartz sand is growing rapidly. According to industry data, the purity of electronic-grade quartz sand has been improved to more than 99.999%. As the core technology for purifying quartz sand at present, the acid pickling purification process has become the focus of the industry due to its excellent impurity removal capability. The acid pickling purification process of quartz sand is a process of dissolving and removing impurities such as metal oxides and carbonates in quartz sand by chemical reaction between acid and impurities.

[0003] The acid pickling purification process includes multiple fine links, and the general process is as follows: first, pretreatment, crushing and screening the quartz sand to make its particle size uniform, creating good conditions for subsequent acid pickling; then, entering the acid pickling stage, soaking the quartz sand in the prepared acid solution, and controlling the concentration, temperature and soaking time of the acid solution to allow the acid to fully react with the impurities; after acid pickling, water washing is performed to remove residual acid and dissolved impurities; finally, drying treatment is performed to make the quartz sand meet the required moisture standard.

[0004] The acid pickling purification process has the following advantages: first, high purity guarantee, which can significantly reduce the impurity content in quartz sand and meet the strict requirements of high-end industries for high-purity quartz sand; second, wide applicability, which can handle quartz sand raw materials of different grades and different impurity compositions, providing more raw material options for enterprises; third, high efficiency and energy saving, compared with some traditional high-temperature smelting purification methods, the acid pickling process has lower energy consumption and higher production efficiency; fourth, environmental protection and controllability, through a perfect wastewater treatment system, the acid wastewater generated during the acid pickling process can be neutralized, precipitated and filtered to achieve standard discharge and reduce environmental pollution.

[0005] However, the existing quartz sand acid pickling purification equipment still has some defects, for example, the quartz sand will turn yellow after acid pickling, which is mainly caused by the color development phenomenon of trivalent iron compounds (such as Fe(OH)3 or Fe2O3·nH2O) attached to the surface or retained inside the particles; because the raw quartz sand itself has a high content of primary iron, which provides the material basis for yellowing; the key lies in the serious incompleteness of the post-treatment link after acid pickling, if the acid washing is not thorough, the residual iron-containing ion wastewater will cause "iron back penetration" phenomenon in the subsequent dehydration and drying process, that is, Fe 2+ is oxidized to Fe 3+ and hydrolyzed to form insoluble iron hydroxide colloid, which is firmly attached to the surface of the sand particles to form yellow spots. SUMMARY

[0006] The electronic grade quartz sand impurity removal and purification equipment aims to solve the above technical problems.

[0007] The electronic grade quartz sand impurity removal and purification equipment aims to solve the above technical problems.

[0008] The electronic grade quartz sand impurity removal and purification equipment comprises a controller, a crushing module, an acid pickling module and a drying module arranged in sequence, the acid pickling module comprises an acid pickling reactor and an acid washing tank, the acid pickling reactor comprises a kettle body, the top of the kettle body is provided with a feeding port, the bottom of the kettle body is provided with an acid outlet and a sand outlet, the sand outlet is communicated with the inlet of the acid washing tank through a pipeline, and control valves are arranged at the acid outlet and the sand outlet.

[0009] A stirring mechanism is arranged in the acid washing tank, the top of the acid washing tank is provided with an inlet, one side of the bottom of the acid washing tank is provided with a drain valve, and a water circulation mechanism is further arranged in the acid washing tank.

[0010] Further, the water circulation mechanism comprises:

[0011] A multi-stage spray pipe group is arranged at different heights of the inner wall of the acid washing tank, and the multi-stage spray pipe group is connected with a deionized water source outside the acid washing tank through a pump and a pipeline, so as to provide continuously updated cleaning water into the tank.

[0012] An ultrasonic vibration plate is embedded and installed on the inner wall of the acid washing tank.

[0013] A pH on-line detector is arranged on the inner wall of the acid washing tank, and the probe of the pH on-line detector is inserted into the cleaning water in the acid washing tank, so as to monitor the pH value of the cleaning water in real time.

[0014] An inert gas inlet is arranged on the side wall of the acid washing tank and connected with an inert gas source outside the acid washing tank, so as to fill inert gas into the acid washing tank and maintain inert atmosphere during the cleaning process.

[0015] Further, the acid washing tank is provided with a plurality of acid washing zones from top to bottom, and the quartz sand is sequentially cleaned from top to bottom, and the cleaning water is sequentially circulated from the corresponding spray pipe group from bottom to top, the bottom of each acid washing zone is provided with a sand outlet, the side of the sand outlet is provided with a water outlet, and control valves are arranged on the water outlet and the sand outlet.

[0016] Further, one stirring mechanism is arranged in each acid washing zone, the stirring mechanism comprises a driving motor, a stirring shaft and paddles, the paddles are arranged in multiple numbers and arranged at intervals on the stirring shaft, the stirring shaft is in transmission connection between the driving motor, and the stirring shaft is rotatably installed at the middle position of each acid washing zone; the rotating speed of the stirring shaft in each acid washing zone gradually decreases from top to bottom.

[0017] Further, in addition to the bottom layer of the acid washing area, an auxiliary mechanism is arranged in each layer of the acid washing area, and the auxiliary mechanism is used for assisting stirring at the dead angle of the acid washing area.

[0018] Further, 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 is provided with 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.

[0019] Further, the auxiliary mechanism further comprises an aeration pipe distributed at the bottom of the acid washing area, the aeration pipe is connected with an external inert gas source through a pipeline, and the aeration pipe is used for intermittently releasing bubbles from the bottom of the acid washing area, agitating the quartz sand particles deposited at the bottom, and making the quartz sand particles resuspended in the cleaning water.

[0020] Further, the auxiliary mechanism further comprises a linkage assembly, and the linkage assembly is used for realizing linkage between the stirring mechanism and a valve body arranged on the inert gas inlet pipeline.

[0021] 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 center of the driven gear; the 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 top wall in the valve body, a roller is rotatably installed on the top rod extending out of the valve body, the roller is in contact with the cam, and the baffle is in sealing connection with the inert gas inlet pipeline in the initial state.

[0022] When the driving motor is started to drive the stirring shaft to rotate, the cam is driven to rotate through the gear meshing transmission, the protruding part of the cam periodically presses the roller to overcome the resistance of the tension spring, the inert gas inlet pipeline is opened, and the inert gas passage is opened.

[0023] When the driving motor is stopped and the stirring shaft is stopped, the cam is stopped 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.

[0024] The beneficial effects of the present application are as follows:

[0025] (1) The mechanical linkage assembly is arranged, mechanical linkage control of the stirring mechanism and the inert gas supply valve is realized, the problem of unsynchronized protection gas supply caused by failure of the electric control system or human operation error is effectively solved, the stirring operation and the inert atmosphere establishment are completely synchronized, as long as the stirring is started, the cam mechanism drives the valve to open the gas path, when the stirring is stopped, the tension spring resets the baffle to cut off the gas path, the hard interlocking mechanism fundamentally avoids the phenomenon of surface oxidation and yellowing of the quartz sand due to exposure to oxygen environment in the stirring process, and the appearance quality and chemical stability of the product are improved; meanwhile, the on-demand supply mode greatly reduces the waste of high-purity inert gas and reduces the production cost.

[0026] (2) The multistage acid washing pool structure integrated with the ultrasonic vibration plate, the countercurrent spraying and the mechanical stirring is adopted, a multilayer and synergistic cleaning system is formed, the impurity removal efficiency is improved and the cleaning dead angle is eliminated; the cavitation effect of the ultrasonic wave can effectively strip the stubborn iron scale and colloid wrapping on the particle surface; the multistage countercurrent spraying realizes the step-by-step utilization of the cleaning water and the efficient directional mass transfer of the impurities by using the concentration difference principle; the stirring mechanism arranged in different regions ensures the uniformity of the flow field; the three work together to overcome the limitations of single cleaning mode, especially solve the residual problem of the pool wall and the pool bottom area, and ensure the final cleaning purity of the quartz sand, and provide reliable guarantee for preparation of electronic-grade high-purity quartz sand. BRIEF DESCRIPTION OF DRAWINGS

[0027] The application will be further described below with reference to the drawings.

[0028] Figure 1 It is the overall layout of the application;

[0029] Figure 2 It is the three-dimensional schematic view of the acid washing pool in the application;

[0030] Figure 3 It is Figure 2 the position schematic view of the multistage spraying pipe group in the application;

[0031] Figure 4 It is the internal structure schematic view of the acid washing area in the application;

[0032] Figure 5 It is Figure 4 the internal structure schematic view of the valve body in the application.

[0033] BRIEF DESCRIPTION OF DRAWINGS:1, crushing module;2, pickling reactor;3, acid washing pool;4, drying module;5, water circulation mechanism;51, multi-stage spraying pipe group;52, pump;53, ultrasonic vibration plate;54, inert gas inlet;55, acid washing area;551, fine washing area;552, rinsing area;553, primary washing area;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 assembly;741, valve body;742, driving gear;743, driven gear;744, cam;745, baffle;746, ejector rod;747, tension spring;748, roller. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] Please refer to Figures 1-5 As shown in the drawings, the present application is a kind of electronic grade quartz sand impurity removal and purification equipment, comprising: a controller, crushing module 1, acid washing module and drying module 4 arranged in sequence, the acid washing module comprises pickling reactor 2 and acid washing pool 3, pickling reactor 2 comprises kettle body, the top of the kettle body is provided with a feeding port, the bottom of the kettle body is provided with an acid outlet and a sand outlet, the sand outlet is communicated with the inlet of the acid washing pool 3 through a pipeline, the acid outlet and the sand outlet are both provided with control valves;

[0036] The stirring mechanism 6 is arranged in the acid washing pool 3, the top of the acid washing pool 3 is provided with an inlet, one side of the bottom of the acid washing pool 3 is provided with a drain valve, and the acid washing pool is also provided with a water circulation mechanism 5.

[0037] The water circulation mechanism 5 comprises:

[0038] The multi-stage spraying pipe group 51 is arranged at different heights on the inner wall of the acid washing pool 3, and the multi-stage spraying pipe group 51 is connected with the deionized water source outside the acid washing pool 3 through the pump 52 and the pipeline, for providing continuous and updated cleaning water into the pool;

[0039] The ultrasonic vibration plate 53 is installed at the bottom and the inner wall of the acid washing pool 3, for generating high-frequency ultrasonic waves to physically strip the stubborn iron scale and colloidal particles attached to the surface of the quartz sand through cavitation effect;

[0040] The pH on-line detector is arranged on the inner wall of the acid washing pool 3, and the probe of the pH on-line detector is inserted into the cleaning water in the acid washing pool 3, for monitoring the pH of the cleaning water in real time.

[0041] Inert gas inlet 54 is opened on the side wall of the acid washing tank 3 and is connected with the inert gas source outside the acid washing tank 3, such as nitrogen or argon, for filling the inert gas into the acid washing tank 3 to maintain the inert atmosphere of the cleaning process.

[0042] The acid washing tank 3 is provided with a plurality of acid washing areas 55 from top to bottom, and the quartz sand is sequentially cleaned from top to bottom, and the cleaning water is sequentially sprayed from the corresponding spray pipe group from bottom to top, the bottom of each acid washing area 55 is provided with a sand outlet 56, one side of the sand outlet 56 is provided with a water outlet, and the water outlet and the sand outlet 56 are both provided with control valves.

[0043] In the present application, in order to solve the problem of yellowing of quartz sand caused by problems existing in the acid washing process, the water circulation mechanism 5 is arranged, after the quartz sand is pretreated and broken and acid washed, the quartz sand is timely introduced into the acid washing tank 3, and the quartz sand after acid washing is subjected to the circulation acid washing from top to bottom by the water circulation mechanism 5 in the acid washing tank 3; wherein the multi-stage spray pipe group 51 provides continuously updated and clean deionized water, realizes the reverse flow cleaning principle, greatly improves the cleaning efficiency and water efficiency, and ensures that the residual acid liquid and iron ions are fully replaced and removed; the cavitation effect of the ultrasonic vibration plate 53 can penetrate the water film and directly act on the surface of the quartz sand particles, and the small iron rust colloids and wrappings that are difficult to remove by mechanical stirring are stripped, so that the cleaning dead angle problem is solved; at the same time, nitrogen is filled into the closed acid washing tank 3, and oxygen is excluded, so that the path of Fe 2+ being oxidized to Fe 3+ is fundamentally cut off, thereby preventing the generation of colloidal deposition and eliminating the yellowing caused by oxidation and hydrolysis from the source; when the cleaning water is neutralized by the pH on-line detector, it is allowed to be discharged to the drying module 4 for the next drying;

[0044] Specifically, the inside of the acid washing tank 3 is divided into three areas from top to bottom, corresponding to three-stage spraying, wherein the first-stage spraying area is the fine washing area 551, which is at the lowermost part and is equipped with the first-stage spray pipe, and the spraying is the purest fresh deionized water; the second-stage spraying area is the rinsing area 552, which is in the middle and is equipped with the second-stage spray pipe, and the spraying is the relatively clean recycled water after recovery treatment or the secondary water from the fine washing area 551; the third-stage spraying area is the primary washing area 553, which is at the uppermost part and is equipped with the third-stage spray pipe, and the spraying is the slightly contaminated water from the rinsing area 552; at the same time, the acid washing tank 3 is provided with a drain valve at the bottom and an overflow port at the top.

[0045] It should be noted that the ultrasonic vibration plate 53 is arranged in the primary washing area 553, the pH on-line detector is arranged at the bottom of the fine washing area 551, and the inert gas inlet 54 is arranged in each acid washing area 55.

[0046] In operation, firstly, the quartz sand after pickling enters the pickling tank 3 from the top inlet, firstly falls into the third-stage spraying area, i.e. the primary washing area 553; the state of the quartz sand in the primary washing area 553 is the dirtiest, the pH value is extremely low, and the Fe ion concentration is the highest; the water source is the third-stage spraying pipe starting to spray the slightly contaminated water used from the secondary rinsing area 552; although this part of water is not fresh water, the acidity and iron content are far lower than the residual liquid on the surface of the sand particles, and by using the concentration difference, most of the high-concentration waste acid liquid can be replaced, this process consumes a large amount of water, but the slightly contaminated water from the rinsing area 552 is used, and fresh water is saved; then the quartz sand enters the rinsing area 552, the sand particles are washed, the acidity is weakened, but it still does not reach the standard, and the water source is the second-stage spraying pipe starting to spray the secondary water used from the first-stage fine washing area 551, so as to further dilute and flush the medium-concentration impurities remaining on the surface of the sand particles, and the cleaning effect and efficiency are necessarily stronger than static soaking; finally, the quartz sand particles enter the fine washing area 551, at this time, the quartz sand particles are relatively clean and close to neutral, and the water source is the first-stage spraying pipe starting to spray fresh high-purity deionized water, and then the last flushing is performed by using the cleanest water, so as to ensure that the residual trace ions are completely replaced, and the quartz sand reaches the final cleaning requirement.

[0047] In this process, the flow direction of the water is completely opposite to that of the sand particles, the fresh deionized water is injected from the bottom first-stage fine washing area 551, after the sand in the fine washing area 551 is cleaned, this part of water becomes relatively clean secondary water, is pumped to the second-stage spraying pipe by the pump 52, and is used to flush the sand in the second-stage area; after the second-stage area is washed, the water becomes slightly contaminated water, is pumped to the third-stage spraying pipe, and is used to primary wash the dirtiest sand; finally, in the third-stage primary washing area 553, the waste water containing high-concentration acid and iron ions after multiple uses is discharged from the overflow port at the top of the pickling tank 3; by this countercurrent multi-stage spraying design, the dirtiest sand always encounters relatively dirty water, the cleanest sand encounters the purest water, a relatively large concentration difference is always maintained, which is the driving force for the impurities to diffuse from the surface of the sand to the water, and the cleaning efficiency is the highest; at the same time, each drop of water experiences multiple use processes of fine washing, rinsing and primary washing, and is finally discharged as waste water, so that the consumption of fresh deionized water is greatly reduced, and multiple effects are achieved at a time.

[0048] Each pickling area 55 is provided with a stirring mechanism 6, the stirring mechanism 6 comprises a driving motor 61, a stirring shaft 62 and paddles 63, the paddles 63 are provided with multiple and are arranged at intervals on the stirring shaft 62, the stirring shaft 62 is in transmission connection between the driving motor 61, and the stirring shaft 62 is rotatably installed at the middle position of each pickling area.

[0049] In the application, the stirring shaft 62 is driven to rotate by the adjustable speed driving motor 61, the paddle 63 is driven to rotate by the stirring shaft 62, and then the quartz sand particles in the whole acid washing area 55 are fully stirred, so that the possibility of acid washing dead angle is reduced, and since the cleanliness of the quartz sand particles gradually increases from top to bottom, the quartz sand particles in the upper layer need a greater stirring speed to fully mass transfer with the cleaning water as much as possible, so that the gradient acid washing effect of the quartz sand particles is improved, and the purpose of avoiding improper acid washing of the quartz sand particles is achieved as much as possible.

[0050] In addition to the bottom layer of the acid washing area 55, the auxiliary mechanism 7 is arranged in each layer of the acid washing area 55, and the auxiliary mechanism 7 is used for auxiliary stirring at the dead angle of the acid washing area 55.

[0051] The auxiliary mechanism 7 comprises: a rotating scraper 71 mounted on the inner wall of the acid washing area 55, the rotating scraper 71 is fixed between the stirring shaft 62 and the support 72, the rotating scraper 71 is made of flexible material (such as polytetrafluoroethylene strip), the edge of the rotating scraper 71 is in contact with the inner wall of the acid washing area 55 or has a gap, and is used for scraping off the deposits attached to the inner wall of the acid washing area 55 and destroying the boundary layer of the wall surface.

[0052] The auxiliary mechanism 7 further comprises: an aeration pipe 73 distributed at the bottom of the acid washing area 55, the aeration pipe 73 is connected with an external inert gas source through a pipeline; the aeration pipe 73 is used for intermittently releasing bubbles from the bottom of the acid washing area 55, stirring the quartz sand particles deposited at the bottom, and making the quartz sand particles resuspended in the cleaning water.

[0053] The auxiliary mechanism 7 further comprises a linkage assembly 74, and the linkage assembly 74 is used for linkage between the stirring mechanism 6 and the valve body 741 arranged on the pipeline of the inert gas inlet 54.

[0054] The linkage assembly 74 comprises: a driving gear 742 fixed on the stirring shaft 62, a driven gear 743 engaged with the driving gear 742 for transmission, two gears can be transmitted through an idler gear, and a cam 744 is fixed on the shaft center of the driven gear 743; the valve body 741 is arranged on the pipeline of the inert gas inlet 54, the valve body 741 is slidably and sealingly connected with a baffle 745, the top of the baffle 745 is fixed with a top rod 746, a tension spring 747 is arranged between the top rod 746 and the top wall in the valve body 741, the top rod 746 extends out of the valve body 741 and is rotatably installed with a roller 748, the roller 748 is in contact with the cam 744, and the baffle 745 is initially sealed to the pipeline of the inert gas inlet 54; wherein the driven gear 743 is rotatably installed on the acid washing tank 3 through a rotating shaft;

[0055] When the driving motor 61 starts, the stirring shaft 62 rotates, the cam 744 rotates through gear engagement, the convex part of the cam 744 periodically presses the roller 748, overcomes the resistance of the tension spring 747, opens the inert gas inlet 54 pipeline, and makes the inert gas passage open;

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

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

[0058] When a certain acid washing area 55 needs to start the cleaning operation, the driving motor 61 starts, and the stirring shaft 62 of the area rotates; when the stirring shaft 62 rotates, the driving gear 742 fixed thereon rotates, and drives the driven gear 743 engaged therewith to rotate through gear engagement, the rotational movement of the driven gear 743 is transmitted to the cam 744 fixed on the shaft thereof through the shaft, so that the cam 744 starts to rotate synchronously; during the rotation of the cam 744, when the convex part thereof rotates to the position of contacting the roller 748, the cam 744 will press the roller 748, the roller 748 will transmit the force to the ejector rod 746, the ejector rod 746 will overcome the tension of the tension spring 747, push the baffle 745 to slide in the valve body 741, so as to open 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 area 55 through the opened valve body 741 through the bottom aeration pipe 73, to form micro bubbles, and to stir the deposited quartz sand;

[0059] With the continuous rotation of the cam 744, when the convex part thereof rotates away from the roller 748, the ejector rod 746 loses the pressure, at this time, the rebound force of the tension spring 747 pulls the ejector rod 746 and the baffle 745 to reset, the baffle 745 reseals the inert gas inlet 54 pipeline, and the gas supply is interrupted immediately; therefore, as long as the driving motor 61 continuously operates, the cam 744 will periodically press and release the roller 748, so that the inert gas valve body 741 is opened and closed in a high-frequency and pulse manner; so that the gas supply is also pulsed aeration in a high-frequency manner, the aeration effect is better, and is completely synchronized with the stirring action, the stirring is supplied with gas, and the stirring is stopped with gas; when the cleaning operation of the acid washing area 55 is completed, the driving motor 61 stops, and the cam 744 stops at a certain fixed angle, no matter where the cam 744 stops, under the action of the tension spring 747, the baffle 745 will be reliably reset and sealed, the inert gas passage is completely cut off, any gas waste is avoided, and then the automatic and synchronous linkage of the stirring mechanism 6 and the inert gas supply is realized through the linkage assembly 74, the reliability of the process operation is ensured, and the consumption of the inert gas is effectively saved.

[0060] Through the technical scheme, on one hand, the pure mechanical transmission formed by the gear engagement and the cam 744 top pressure makes the rotary power of the stirring mechanism 6 directly converted into the mechanical energy for controlling the on-off of the inert gas inlet 54 pipeline. As long as the stirring is started, the gas passage is opened. Once the stirring is stopped, the gas supply is immediately interrupted. The hard interlocking mechanism fundamentally eliminates the risk that the gas supply is out of synchronization with the process demand due to circuit failure, program error or sensor malfunction, ensures that the protection of the inert atmosphere is always synchronized with the stirring operation in the high-risk cleaning stage, and greatly avoids the problem of product oxidation yellowing caused by the lack of protective gas. On the other hand, compared with the traditional timing or manual gas supply mode, there is inevitably gas waste. The present application realizes the on-demand and accurate pulse gas supply through the linkage assembly 74. The length and intensity of the gas supply are completely bound with the stirring operation time, eliminating unnecessary waste. For the production process that continuously consumes high-purity inert gas, the operating cost can be reduced.

[0061] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.

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.

2. The electronic grade quartz sand impurity removal purification apparatus according to claim 1, characterized by, 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, and maintaining the inert atmosphere of the cleaning process.

3. The electronic grade quartz sand impurity removal purification apparatus according to claim 2, characterized by, The pickling tank is provided with a plurality of pickling zones from top to bottom, and 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 zone 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.

4. The electronic grade quartz sand impurity removal purification apparatus according to claim 3, characterized by, Each pickling zone is provided with a stirring mechanism, the stirring mechanism comprises a driving motor, a stirring shaft and a paddle, the paddle is provided with a plurality of paddles and is arranged at intervals on the stirring shaft, the stirring shaft is in transmission connection between the driving motor, and the stirring shaft is rotatably installed at the middle position of each pickling zone; the rotating speed of the stirring shaft in each pickling zone gradually decreases from top to bottom.

5. The electronic grade quartz sand impurity removal purification apparatus according to claim 4, characterized by, In addition to the bottommost pickling zone, an auxiliary mechanism is arranged in each pickling zone, and the auxiliary mechanism is used for auxiliary stirring at the dead angle of the pickling zone.

6. The electronic grade quartz sand impurity removal purification apparatus according to claim 5, characterized by, The auxiliary mechanism comprises a rotating scraper installed on the inner wall of the pickling zone, the rotating scraper is fixed between the stirring shaft through a support, the rotating scraper is made of flexible material, the edge of the rotating scraper is in contact with or has a gap with the inner wall of the pickling zone, and is used for scraping off the deposits attached to the inner wall of the pickling zone and destroying the boundary layer of the wall surface.

7. The electronic grade quartz sand impurity removal purification apparatus according to claim 6, characterized by, The auxiliary mechanism further comprises an aeration pipe distributed at the bottom of the pickling zone, the aeration pipe is connected with an external inert gas source through a pipeline, and is used for intermittently releasing bubbles from the bottom of the pickling zone, stirring the quartz sand particles deposited at the bottom, and making the quartz sand particles resuspended in the cleaning water.

8. The electronic grade quartz sand impurity removal purification apparatus according to claim 7, characterized by, 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 pipeline of the inert gas inlet. The linkage assembly comprises: a driving gear fixed on the stirring shaft, a driven gear engaged with the driving gear for transmission, and a cam fixed on the shaft center 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 top wall in the valve body, the top rod is extended out of the valve body and rotatably installed with a roller, 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 to drive the stirring shaft to rotate, the cam is driven to rotate through the gear engagement, the convex part of the cam periodically presses the roller to overcome the resistance of the tension spring, the inert gas inlet pipeline is opened, and the inert gas passage is opened; When the driving motor is stopped and the stirring shaft is stopped, the cam is stopped 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.

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