High purity quartz sand pickling system and pickling method

Abstract

The invention relates to a high-purity quartz sand pickling system and a pickling method. The high-purity quartz sand pickling system comprises a pickling device, a pickling fluidizing device, a pipeline assembly and a high-temperature aeration device. The acid preparation device can mix hydrofluoric acid, oxalic acid and water according to a preset ratio and preheat them to a preset temperature. Only two acid solutions are needed to prepare a pickling solution with a good pickling effect, thereby reducing the amount and type of acid solutions. The preheated pickling solution is added to the fluidizing barrel from the upper acid inlet and the lower inlet and outlet, respectively, which increases the injection speed of the pickling solution and further increases the pickling efficiency; the pickling solution sprayed from multiple nozzles is used to perform initial acid washing on the quartz sand in the falling process, and then high-temperature and high-pressure gas is injected into the fluidizing barrel through the lower inlet and outlet to maintain the temperature stability of the pickling reaction stage, and the pickling solution and quartz sand in the fluidizing barrel are stirred to achieve dynamic pickling, which greatly shortens the pickling reaction time, improves the pickling effect, and further improves the pickling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of quartz sand processing equipment, in particular to a high-purity quartz sand pickling system and a pickling method. Background Art

[0002] Quartz glass is a high-tech material that is now widely used in semiconductor, communication, new energy and other industries. It is an indispensable basic material in modern science and technology and industrial manufacturing. The pickling process is one of the most important processes in the purification of quartz sand, which is mainly used to separate some metal oxides to improve the purity.

[0003] Traditional quartz sand pickling usually adopts static pickling and dynamic pickling methods, but the static pickling method usually takes a long time to pickle and consumes a lot of acid, which will result in low pickling efficiency and easily lead to unstable product quality after treatment. Most traditional dynamic pickling devices use mechanical stirring, but due to the high hardness of quartz sand, the wear on the stirring device is very large, resulting in a large maintenance workload and easy to cause secondary pollution to the quartz sand. Summary of the invention

[0004] Based on this, it is necessary to provide a high-purity quartz sand pickling system and pickling method with good purification pickling effect, low acid usage and high pickling efficiency.

[0005] A high-purity quartz sand pickling system, comprising:

[0006] The acid preparation device comprises an acid preparation barrel, a stirring mechanism and a heating element; the top of the acid preparation barrel is provided with a first acid addition port, a second acid addition port and a water addition port; the bottom of the acid preparation barrel is provided with an acid supply port; the stirring mechanism is installed in the acid preparation barrel and is configured to stir and mix the pickling solution in the acid preparation barrel; the heating element is used to heat the mixed pickling solution in the acid preparation barrel to a preset preheating temperature;

[0007] A pickling fluidized device comprises a fluidized barrel, a spray pipe and a plurality of nozzles arranged on the spray pipe at intervals along the extension direction of the spray pipe; the top of the fluidized barrel is provided with an upper acid inlet, a sand inlet and an exhaust port; the bottom of the fluidized barrel is provided with a lower inlet and an acid exhaust port; the spray pipe is spirally arranged on the inner wall of the fluidized barrel near the top along the height direction of the fluidized barrel and is connected with the upper acid inlet;

[0008] A pipeline assembly, comprising a sand discharge pipe, an acid discharge pipe, an upper acid inlet control valve, a reversing control valve, an acid discharge control valve, a sand discharge control valve, an acid discharge pump, a sand discharge pump, an acid supply main valve, an aeration control valve and a venturi tube; one end of the sand discharge pipe is connected to the lower inlet and outlet through the reversing control valve; one end of the acid discharge pipe is connected to the acid discharge port; the acid discharge control valve and the acid discharge pump are both arranged on the acid discharge pipe; the sand discharge control valve and the sand discharge pump are both arranged on the sand discharge pipe; the acid supply port is connected to the middle part of the venturi tube through the acid supply main valve; the outlet end of the venturi tube is respectively connected to the upper acid inlet through the upper acid inlet control valve and to the lower inlet and outlet through the reversing control valve;

[0009] The high temperature aeration device has an air outlet which is connected to the inlet end of the venturi tube through the aeration control valve.

[0010] When the above-mentioned high-purity quartz sand pickling system is used, hydrofluoric acid, oxalic acid and water are first mixed in an acid preparation device according to a preset ratio and preheated to a preset preheating temperature; then the preheated pickling liquid is added to the fluidized barrel through the upper acid inlet and the lower inlet and outlet respectively, and the quartz sand to be pickled is added to the fluidized barrel through the sand inlet at the same time. During the falling process of the quartz sand to be pickled in the fluidized barrel, the pickling liquid entering from the upper acid inlet is sprayed out through multiple nozzles to perform initial acid washing on the quartz sand to be pickled in the falling process; after the injection of the pickling liquid is completed, a high-temperature aeration device is used to inject high-temperature and high-pressure gas into the fluidized barrel through the lower inlet and outlet to ensure that the pickling liquid in the fluidized barrel is kept at a preset pickling temperature for a preset time to wait for the pickling liquid and sand to fully react; then the pickling liquid is discharged through the acid discharge port; after the pickling liquid is discharged, the quartz sand after pickling and purification in the fluidized barrel is discharged through the lower inlet and outlet and the sand discharge pipe to realize the unloading work.

[0011] The acid preparation device can mix hydrofluoric acid, oxalic acid and water in a preset ratio and preheat them to a preset temperature. Only two acid solutions are needed to prepare a pickling solution with a good pickling effect, which reduces the amount and type of acid solution used. The preheated pickling solution is added to the fluidized barrel from the upper acid inlet and the lower inlet and outlet respectively, which increases the injection speed of the pickling solution into the fluidized barrel, which is beneficial to the improvement of the pickling efficiency of quartz sand; and the pickling solution sprayed from multiple nozzles is used for initial acid washing in the process of falling in the fluidized barrel. After that, in the insulation reaction stage after the injection of the pickling solution, high-temperature and high-pressure gas is injected into the fluidized barrel through the lower inlet and outlet. While ensuring that the temperature in the fluidized barrel can be stably maintained at the preset insulation temperature, the pickling solution and quartz sand in the fluidized barrel are also stirred to achieve dynamic pickling, which greatly shortens the pickling reaction time and is beneficial to further improve the pickling efficiency. Therefore, the above-mentioned high-purity quartz sand pickling system has the advantages of good pickling effect, high pickling efficiency, and fewer types and amounts of acid solution used.

[0012] A high-purity quartz sand pickling method is applied to the high-purity quartz sand pickling system as described above, characterized in that the high-purity quartz sand pickling method comprises the steps of:

[0013] Adding hydrofluoric acid, oxalic acid and water into the acid preparation barrel through the first acid adding port, the second acid adding port and the water adding port in a preset ratio, and stirring and mixing by the stirring mechanism to obtain an acid washing solution;

[0014] Preheating the pickling solution to a preset preheating temperature by using the heating element;

[0015] Open the high-temperature aeration device, open the acid supply main valve, the upper acid inlet control valve, the passage of the reversing control valve toward the lower inlet and outlet, and the aeration control valve, so as to spray the preheated acid washing liquid into the fluidizing barrel through the nozzle and the lower inlet and outlet respectively;

[0016] While acid is being fed into the fluidized barrel, quartz sand to be acid-washed is added into the fluidized barrel through the sand inlet;

[0017] Close the acid supply main valve and the upper acid inlet control valve, so that the passage of the reversing control valve toward the lower inlet and outlet, the aeration control valve and the high-temperature aeration device are all in an open state, so that the quartz sand to be pickled and the pickling liquid in the fluidized tank react at a preset insulation temperature for a preset time; the preset insulation temperature is 60°C to 70°C;

[0018] The high-temperature aeration device, the aeration control valve and the reversing control valve are closed, and the acid discharge control valve and the acid discharge pump are opened to extract the pickling liquid in the fluidized tank through the acid discharge pipe;

[0019] The high-temperature aeration device, the aeration control valve, the passage of the reversing control valve away from the lower inlet and outlet, and the sand discharge control valve are opened, and the purified quartz sand in the fluidized tank falls into the sand discharge pipe through the lower inlet and outlet, and is moved by the high-temperature and high-pressure gas provided by the high-temperature aeration device;

[0020] When the purified quartz sand is pushed to the sand discharge pump, the sand discharge pump is turned on, and the high-temperature aeration device and the aeration control valve are closed to carry out the unloading of the purified quartz sand.

[0021] The above-mentioned high-purity quartz sand pickling method can clearly obtain a pickling solution with a high pickling effect by performing the step of obtaining the pickling solution. The amount and type of acid solution used are reduced. By performing the step of preheating the pickling solution, the subsequent pickling reaction time is shortened, which is conducive to improving the pickling efficiency. By performing the step of injecting the pickling solution into the fluidized barrel, the pickling solution can be injected into the fluidized barrel from the upper and lower ends of the fluidized barrel at the same time, shortening the injection time of the pickling solution, which is conducive to further improving the pickling efficiency. By performing the step of injecting the pickling solution into the fluidized barrel and the step of adding the quartz sand to be pickled into the fluidized barrel at the same time, the quartz sand to be pickled is initially acid-rinsed by the pickling solution sprayed from multiple nozzles during the falling process in the fluidized barrel, so as to shorten the subsequent pickling reaction time, and at the same time, the amount of pickling solution used can be reduced, further reducing the amount of acid solution used. By performing the heat preservation reaction step of the pickling liquid and quartz sand, and using the high temperature and high pressure gas provided by the high temperature aeration device, not only can the temperature in the fluidized barrel be stably maintained within the preset heat preservation temperature range, but the pickling liquid and quartz sand in the fluidized barrel are also stirred to achieve dynamic pickling, further shortening the pickling reaction time, making the quartz sand pickling efficiency higher, and at the same time conducive to improving the pickling effect. Therefore, the adoption of the above-mentioned high-purity quartz sand pickling method can reduce the amount of acid used, reduce the types of acid used, and improve the pickling efficiency and pickling effect of quartz sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a high-purity quartz sand pickling system provided in one embodiment of the present invention;

[0023] Figure 2 Figure 1 The structural schematic diagram of the pickling fluidization device in the high-purity quartz sand pickling system is shown;

[0024] Figure 3 for Figure 1 The schematic diagram of the installation status between the spray pipe and the nozzle in the high-purity quartz sand pickling system shown;

[0025] Figure 4 for Figure 1 The schematic diagram of the structure of the homogenizer in the high-purity quartz sand pickling system is shown;

[0026] Figure 5 A schematic flow chart of a high-purity quartz sand pickling method provided in another embodiment of the present invention;

[0027] Figure 6 for Figure 5 The schematic flow chart of step S50 in the high-purity quartz sand pickling method is shown;

[0028] Figure 7 for Figure 5The figure is a schematic flow chart of steps S90 to S103 after step S80 in the high-purity quartz sand pickling method.

[0029] Explanation of reference numerals: 110, acid preparation device; 111, acid preparation barrel; 1111, first acid addition port; 1112, second acid addition port; 1113, water addition port; 1114, standby port; 1115, acid supply port; 112, stirring mechanism; 120, pickling fluidized device; 121, fluidized barrel; 1211, upper acid inlet; 1212, sand inlet; 1213, exhaust port; 1214, lower inlet and outlet; 1215, acid discharge port; 1216, reflux port; 1217, discharge port; 1218, upper end plate; 1219, upper side plate; 1201, lower end plate; 1202, lower side plate; 122, spray pipe; 123, nozzle; 124, homogenizer; 1241, bottom plate; 1242, side plate; 1243, sand inlet hole; 12 44. Sand passage trough; 125. Insulation structure layer; 130. Pipeline assembly; 131. Sand discharge pipe; 132. Acid discharge pipe; 133. Acid inlet control valve; 134. Reversing control valve; 135. Acid discharge control valve; 136. Sand discharge control valve; 137. Acid discharge pump; 138. Sand discharge pump; 139. Acid supply main valve; 1301. Aeration control valve; 1302. Reflux valve; 1303. Reflux pump; 1304. Cleaning water pipe; 1305. Cleaning control valve; 1306. Venturi tube; 140. High-temperature aeration device. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0033] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0034] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0035] See also Figure 1 A high-purity quartz sand pickling system provided in one embodiment of the present invention includes an acid preparation device 110, a pickling fluidized tank 121, a pipeline assembly 130 and a high-temperature aeration device 140.

[0036] The acid preparation device 110 includes an acid preparation barrel 111, a stirring mechanism 112 and a heating element (not shown). The top of the acid preparation barrel 111 is provided with a first acid addition port 1111, a second acid addition port 1112 and a water addition port 1113. The bottom of the acid preparation barrel 111 is provided with an acid supply port 1115. The stirring mechanism 112 is installed in the acid preparation barrel 111 and is configured to stir and mix the pickling solution in the acid preparation barrel 111. The heating element is used to heat the mixed pickling solution in the acid preparation barrel 111 to a preset preheating temperature. Specifically, the preset preheating temperature is 65°C to 75°C. Among them, one of the first acid addition port 1111 and the second acid addition port 1112 is used to add hydrofluoric acid to the acid preparation barrel 111, and the other is used to add oxalic acid to the acid preparation barrel 111. Of course, in multiple acid preparation processes, it is not limited that the same acid can only be added at the same acid addition port.

[0037] Of course, in other embodiments, for convenience of use, a spare port 1114 may also be opened at the top of the acid preparation barrel 111.

[0038] Please also read Figure 2 and Figure 3 The pickling fluidized device 120 includes a fluidized barrel 121, a spray pipe 122, and a plurality of nozzles 123 arranged on the spray pipe 122 at intervals along the extension direction of the spray pipe 122. An upper acid inlet 1211, a sand inlet 1212, and an exhaust port 1213 are provided at the top of the fluidized barrel 121. A lower inlet 1214 and an acid exhaust port 1215 are provided at the bottom of the fluidized barrel 121. The spray pipe 122 is spirally arranged on the inner wall of the fluidized barrel 121 near the top along the height direction of the fluidized barrel 121, and is connected to the upper acid inlet 1211. In this way, a plurality of nozzles 123 are spaced apart and spread all over the inner wall of the fluidized barrel 121 near the top.

[0039] Please refer again Figure 1The pipeline assembly 130 includes a sand discharge pipe 131, an acid discharge pipe 132, an upper acid inlet control valve 133, a reversing control valve 134, an acid discharge control valve 135, a sand discharge control valve 136, an acid discharge pump 137, a sand discharge pump 138, an acid supply main valve 139, an aeration control valve 1301 and a venturi tube 1306. One end of the sand discharge pipe 131 is connected to the lower inlet and outlet 1214 through the reversing control valve 134. One end of the acid discharge pipe 132 is connected to the acid discharge port 1215. The acid discharge control valve 135 and the acid discharge pump 137 are both arranged on the acid discharge pipe 132. The sand discharge control valve 136 and the sand discharge pump 138 are both arranged on the sand discharge pipe 131. The acid supply port 1115 is connected to the middle part of the venturi tube 1306 through the acid supply main valve 139. The outlet end of the venturi tube 1306 is connected to the upper acid inlet 1211 through the upper acid inlet control valve 133 and is connected to the lower inlet and outlet 1214 through the reversing control valve 134.

[0040] The lower inlet and outlet 1214 and the reversing control valve 134 can be one or more and correspond to each other. When the lower inlet and outlet 1214 and the reversing control valve 134 are both multiple, one opening of the multiple reversing control valves 134 is respectively connected to the multiple lower inlets and outlets 1214 in a one-to-one correspondence, and one end of the sand discharge pipe 131 is respectively connected to the other opening of the multiple reversing control valves 1214.

[0041] The outlet of the high temperature aeration device 140 is connected to the inlet of the venturi tube 1306 through the aeration control valve 1301. The high temperature aeration device 140 is used to provide high temperature and high pressure gas, which can be boiler steam or a gas source unit including a high pressure gas compressor and a heating element.

[0042] Specifically, when there are multiple reversing control valves 1214 , the gas outlet of the high-temperature aeration device 140 is communicated with the openings of the multiple reversing control valves 1214 connected to the sand discharge pipe 131 through the aeration control valves.

[0043] When the above-mentioned high-purity quartz sand pickling system is used, hydrofluoric acid, oxalic acid and water are first mixed in a preset proportion in the acid preparation device 110 and preheated to a preset preheating temperature. Compared with the conventional pickling solution that requires at least three acid solutions to be prepared, only two acid solutions are used in this embodiment to obtain a pickling solution with a better pickling effect, which not only reduces the amount and type of acid solution used, but also shortens the subsequent pickling reaction time, which helps to improve the pickling efficiency.

[0044] The preheated pickling liquid is added into the fluidized barrel 121 through the upper acid inlet 1211 and the lower inlet 1214 respectively to shorten the time for the pickling liquid to be injected into the fluidized barrel 121, thereby further improving the pickling efficiency. While the pickling liquid is injected into the fluidized barrel 121, the quartz sand to be pickled is added into the fluidized barrel 121 through the sand inlet 1212. At this time, the pickling liquid entering from the upper acid inlet 1211 is sprayed out through multiple nozzles 123 to perform initial acid washing on the quartz sand to be pickled during the falling process, which is conducive to further shortening the subsequent pickling reaction time. When there are multiple lower inlets and outlets 1214, the time for the pickling liquid to be injected into the fluidized barrel 121 is further shortened, making the pickling efficiency higher.

[0045] After the injection of the pickling liquid is completed, the high-temperature aeration device 140 is used to inject high-temperature and high-pressure gas into the fluidized barrel 121 through the lower inlet and outlet 1214, so that the temperature in the fluidized barrel 121 is maintained at the preset pickling temperature for a preset reaction time, so that the pickling liquid and sand and gravel can fully react. The high-temperature and high-pressure gas provided by the high-temperature aeration device 140 can not only ensure that the temperature in the fluidized barrel 121 can be stably maintained within the preset pickling temperature range during the pickling reaction, but also stir the pickling liquid and quartz sand in the fluidized barrel 121 to achieve dynamic pickling, further shorten the pickling reaction time, and is conducive to further improving the pickling efficiency, so that the pickling effect is better.

[0046] After the pickling reaction is completed, the pickling liquid is discharged from the acid discharge port 1215 through the acid discharge pipe 132 to achieve the acid discharge work; after the pickling liquid is discharged, the quartz sand after pickling and purification in the fluidized barrel 121 is discharged through the lower inlet and outlet 1214 and the sand discharge pipe 131 to achieve the unloading work. When there are multiple lower inlets and outlets 1214, it can ensure that the quartz sand after pickling and purification in the fluidized barrel 121 is discharged more thoroughly and quickly.

[0047] The following three kinds of quartz sand samples (i.e., raw ore) were used to test the pickling effect of the above-mentioned high-purity quartz sand pickling system under the conditions that the pickling solution includes 5% hydrofluoric acid, 6% oxalic acid and the remainder of water (calculated in terms of mass percentage), the pickling insulation temperature is 65°C, and the pickling insulation time is 6 hours. The sample inspection results are shown in the following table:

[0048]

[0049] As shown in the table above, after experimental comparison, using 5% hydrofluoric acid and 6% oxalic acid, reacting at 65°C for 6-8 hours can achieve quartz sand with a purity of more than 99.9%, and the pickling effect is very good. At the same time, the amount of pickling liquid is 5-15% of the amount of quartz sand in the fluidized barrel 121, so the amount of acid liquid is also very small.

[0050] Therefore, the above-mentioned high-purity quartz sand pickling system has the advantages of good pickling effect, high pickling efficiency and fewer types and amounts of acid used.

[0051] For ease of understanding, a brief description is given of the process of adding the preheated pickling liquid into the fluidizing barrel 121 through the upper acid inlet 1211 and the lower inlet and outlet 1214, respectively: when in use, the high-temperature and high-pressure gas generated by the high-temperature aeration device 140 flows rapidly into the venturi tube 1306, and when the high-temperature and high-pressure gas passes through the venturi tube 1306 at a very high speed, a negative pressure is formed in the venturi tube 1306, so that the preheated pickling liquid in the acid preparation device 110 is sucked into the venturi tube 1306 through the acid supply main valve 139, forming a gas-liquid mixture of the pickling liquid and the high-temperature and high-pressure gas, and then, under the action of the high-temperature and high-pressure gas, the gas-liquid mixture is respectively sent to the upper acid inlet 1211 through the upper acid inlet control valve 133 and to the lower inlet and outlet 1214 through the reversing control valve 134, so as to realize the work of injecting the pickling liquid into the fluidizing barrel 121 through the upper end and the lower end of the fluidizing barrel 121 at the same time.

[0052] Please refer again Figure 1 and Figure 2 In some embodiments, a reflux port 1216 connected to the spray pipe 122 is further provided at the top of the fluidizing barrel 121, and a discharge port 1217 connected to the reflux port 1216 is further provided at the bottom of the fluidizing barrel 121. A reflux valve 1302 and a reflux pump 1303 are provided on the communication passage between the discharge port 1217 and the reflux port 1216. The reflux pump 1303 and the reflux valve 1302 can pump the mixture of the pickling liquid and the quartz sand at the bottom of the fluidizing barrel 121 to the reflux port 1216 through the discharge port 1217, and spray it to the upper end of the fluidizing barrel 121 through the spray pipe 122 and the plurality of nozzles 123, so as to achieve agitation of the pickling liquid and the quartz sand in the fluidizing barrel 121.

[0053] In actual application, after a period of pickling insulation reaction, sand and impurities are precipitated to the bottom of the fluidized barrel 121. At this time, the reflux pump 1303 is started and the reflux valve 1302 is opened to transport the mixture of sand and pickling liquid at the bottom to the spray pipe 122 located near the top of the fluidized barrel 121, forming a circulation of the sand and gravel mixture, achieving a secondary sand mixing effect, further improving the pickling effect, further shortening the pickling reaction time, and facilitating further improvement of the pickling efficiency.

[0054] In some embodiments, the pickling fluidized device 120 further includes a homogenizer 124. The homogenizer 124 is installed at the sand inlet 1212. The homogenizer 124 is configured to disperse the quartz sand to be pickled through the sand inlet 1212. The homogenizer 124 may be a mesh structure, a grid structure formed by cross beams and longitudinal beams interlaced, or a perforated plate structure with many through holes.

[0055] The setting of the homogenizer 124 allows the quartz sand to be pickled to be dispersed at the sand inlet 1212, ensuring that the quartz sand can fall in the fluidized barrel 121 with uniform distribution of particles and fully contact with the pickling liquid sprayed by multiple nozzles 123, thereby improving the initial acid cleaning effect and making the pickling effect and efficiency higher.

[0056] Please also read Figure 4 Specifically, the homogenizer 124 includes a bottom plate 1241 and a side plate 1242 arranged along the circumference of the bottom plate 1241 and connected to the bottom plate 1241. The outer wall of the side plate 1242 is fixedly connected to the edge of the sand inlet 1212, and the bottom plate 1241 is located in the fluidizing barrel 121. A plurality of sand inlet holes 1243 are arranged at intervals on the bottom plate 1241. A plurality of sand passing grooves 1244 are arranged at intervals along the circumference of the bottom plate 1241 at the edge where the side plate 1242 is connected to the bottom plate 1241.

[0057] In this way, the quartz sand added to the homogenizer 124 can fall directly into the fluidizing barrel from the multiple sand inlet holes 1243, or can enter the fluidizing barrel 121 laterally from the sand passing groove 1244, so as to ensure the smoothness of the quartz sand feeding while ensuring the dispersion effect of the quartz sand.

[0058] More specifically, the bottom plate 1241 is a concave plate with a high middle and low surroundings, that is, the middle of the bottom plate 1241 bulges upward in the height direction of the fluidizing barrel 121 to ensure that the quartz sand falling into the homogenizer 124 is dispersed to the surroundings on the bottom plate 1241, thereby improving the dispersion effect and feeding speed.

[0059] Please refer again Figure 1 and Figure 2 In some embodiments, the pipeline assembly 130 further includes a cleaning water pipe 1304 and a cleaning control valve 1305 disposed on the cleaning water pipe 1304. One end of the cleaning water pipe 1304 is connected to the upper acid inlet 1211, and the other end is used to connect to an external water source.

[0060] After the quartz sand pickling work is completed, the cleaning water pipe 1304 is connected to the external water source, and the cleaning control valve 1305, the aeration control valve 1301, and the upper acid control valve 133 are opened, the reversing control valve 134, the sand discharge pump 138 and the sand discharge control valve 136 are closed, and the high-temperature aeration device 140 is started to use the high-temperature and high-pressure gas provided by the high-temperature aeration device 140 to spray the external water onto the inner wall of the fluidized barrel 121 through multiple nozzles 123 to spray the inner wall of the fluidized barrel 121, and then the high-temperature aeration device 140, the aeration control valve 1301, the cleaning control valve 1305, and the upper acid control valve 133 are closed, and the acid discharge control valve 135 and the acid discharge pump 137 are opened to pump out the sewage in the fluidized barrel 121, so as to realize automatic cleaning of the fluidized barrel 121, avoid workers entering the fluidized barrel 121 for cleaning, and reduce the risk of personnel operation.

[0061] It should be noted that when there are multiple lower inlets and outlets 1214 and multiple reversing control valves 134, multiple reversing control valves 134 are opened or closed at the same time during the operation of the above-mentioned high-purity quartz sand pickling system.

[0062] Of course, in order to ensure the cleaning effect in the fluidizing barrel 121, the work of spraying water into the fluidizing barrel 121 and pumping out sewage can also be repeated.

[0063] In some embodiments, the outer wall of the fluidized barrel 121 is provided with a heat-insulating structure layer 125. The heat-insulating structure layer 125 mainly plays a role of heat insulation to ensure that the heat of the preheated pickling liquid is slowly dissipated after entering the fluidized barrel 121, to avoid the temperature in the fluidized barrel 121 from dropping too fast during the pickling and heat-insulating reaction, and to ensure a better pickling reaction effect.

[0064] In some embodiments, the fluidizing barrel 121 includes an upper end plate 1218, a lower end plate 1201 spaced apart from the upper end plate 1218, an upper side plate 1219 disposed along the circumference of the upper end plate 1218 and connected to the upper end plate 1218, and a lower side plate 1202 disposed along the circumference of the lower end plate 1201 and connected to the lower end plate 1201. One end of the upper side plate 1219 away from the upper end plate 1218 is connected to one end of the lower side plate 1202 away from the lower end plate 1201. In the height direction of the fluidizing barrel 121, the orthographic projection of the upper end plate 1218 on the lower end plate 1201 completely covers the lower end plate 1201. The inner diameter of the lower side plate 1202 gradually decreases in the direction from the upper end plate 1218 to the lower end plate 1201. The upper acid inlet 1211, the sand inlet 1212 and the exhaust port 1213 are all located on the upper end plate 1218. The lower inlet and outlet 1214 is located on the lower end plate 1201. The acid discharge port 1215 is located at a position of the lower side plate 1202 close to the lower end plate 1201. The spray pipe 122 is installed on the inner wall of the upper side plate 1219.

[0065] In this way, the upper end of the fluidizing barrel 121 is a straight cylinder structure composed of an upper end plate 1218 and an upper side plate 1219, and the lower end is a conical cylinder structure composed of a lower end plate 1201 and a lower side plate 1202, so as to ensure that the mixture of the pickling liquid and quartz sand in the fluidizing barrel 121 is more easily gathered at the lower inlet and outlet 1214 of the lower end plate 1201, and the mixture of the pickling liquid and quartz sand stirred by the high-temperature and high-pressure gas injected from the lower inlet and outlet 1214 is more likely to slide down along the lower side plate 1202, thereby improving the stirring effect. Similarly, the mixing effect of the mixture extracted from the discharge port 1217 after being sprayed out through multiple nozzles 123 will also be better.

[0066] In order to ensure the stability of the fluidizing barrel 121 during use, the fluidizing barrel 121 is fixed on a fixing frame 126 .

[0067] Please also read Figure 5 The present invention also provides a high-purity quartz sand pickling method, which is applied to the above-mentioned high-purity quartz sand pickling system. The high-purity quartz sand pickling method includes steps S10 to S80.

[0068] In step S10, hydrofluoric acid, oxalic acid and water are added into the acid preparation barrel 111 through the first acid adding port 1111, the second acid adding port 1112 and the water adding port 1113 according to a preset ratio, and stirred and mixed by the stirring mechanism 112 to obtain an acid cleaning solution.

[0069] In order to obtain the best quartz sand pickling effect, specifically, the preset ratio is 5% hydrofluoric acid, 6% oxalic acid and the balance water, calculated by weight percentage. Of course, in other embodiments, the preset ratio can also be other ratios, such as a certain ratio of 4.5% to 5.5% hydrofluoric acid, 5.5% to 6.5% oxalic acid and the balance water.

[0070] Step S20, preheating the pickling solution to a preset preheating temperature by using a heating element. Specifically, the preset preheating temperature is 65°C to 75°C.

[0071] Step S30, open the high temperature aeration device 140, open the acid supply main valve 139, the upper acid control valve 133, the passage from the reversing control valve 134 to the lower inlet and outlet 1214 and the aeration control valve 1301, so as to spray the preheated pickling solution into the fluidizing barrel 121 through the nozzle 123 and the lower inlet and outlet 1214 respectively.

[0072] Step S40, while acid is being added to the fluidized barrel 121, quartz sand to be acid-washed is added to the fluidized barrel 121 through the sand inlet 1212. Specifically, the execution time periods of step S30 and step S40 overlap very much, or the two steps are performed simultaneously.

[0073] Step S50, close the acid supply main valve 139 and the upper acid inlet control valve 133, make the passage of the reversing control valve 134 toward the lower inlet and outlet 1214, the aeration control valve 1301 and the high-temperature aeration device 140 all in an open state, and make the quartz sand to be pickled and the pickling liquid in the fluidized barrel 121 react at a preset insulation temperature for a preset time. The preset insulation temperature is 60°C to 70°C.

[0074] Specifically, the preset time is 6 to 8 hours. According to practice, after 6-8 hours of heat preservation reaction, quartz sand with a purity of more than 99.9% can be obtained.

[0075] Step S60 , closing the high temperature aeration device 140 , the aeration control valve 1301 and the reversing control valve 134 , and opening the acid discharge control valve 135 and the acid discharge pump 137 to extract the acid wash liquid in the fluidized barrel 121 through the acid discharge pipe 132 .

[0076] Step S70, open the high-temperature aeration device 140, the aeration control valve 1301, the passage of the reversing control valve 134 away from the lower inlet and outlet 1214 and the sand discharge control valve 136, and the purified quartz sand in the fluidized barrel 121 falls into the sand discharge pipe 131 through the lower inlet and outlet 1214, and is pushed by the high-temperature and high-pressure gas provided by the high-temperature aeration device 140.

[0077] When executing step S70 , the quartz sand material in the fluidizing barrel 121 falls to the sand discharge pipe 131 under its own gravity, and is then pushed to the sand discharge pump 138 by the high-temperature and high-pressure gas provided by the high-temperature aeration device 140 .

[0078] Step S80, after the purified quartz sand is moved to the sand pump 138, the sand pump 138 is turned on, and the high-temperature aeration device 140 and the aeration control valve 1301 are closed to unload the purified quartz sand.

[0079] Thus, after executing step S70, the sand pump 138 is started to form a negative pressure in the passage formed between the sand discharge pipe 131, the annular control valve and the lower inlet and outlet 1214, thereby pumping out the quartz sand material in the fluidizing barrel 121 to achieve unloading.

[0080] By executing the above steps S10 to S80, the pickling and purification of quartz sand can be achieved to obtain a high-purity quartz sand product. By executing step S10, a pickling solution with a high pickling effect configured by two acid solutions can be obtained, reducing the amount and type of acid solutions. By executing step S20, a pickling solution that can directly perform a pickling reaction can be provided, without the need to heat the pickling solution and quartz sand after mixing to increase the temperature in the fluidized barrel 121, and the subsequent pickling reaction time can be shortened, which is conducive to improving the pickling efficiency. By executing step S30, the pickling solution can be injected into the fluidized barrel 121 from the upper and lower ends of the fluidized barrel 121 at the same time, shortening the injection time of the pickling solution, which is conducive to further improving the pickling efficiency. By executing steps S30 and S40, the quartz sand to be pickled is initially rinsed with acid by the pickling solution sprayed by multiple nozzles 123 during the falling process in the fluidized barrel 121, so as to further shorten the subsequent pickling reaction time. By executing step S50, the high-temperature and high-pressure gas provided by the high-temperature aeration device 140 not only plays a role in heat preservation during the pickling reaction, but also stirs the pickling liquid and quartz sand in the fluidized barrel 121, thereby realizing dynamic pickling and further shortening the pickling reaction time, making the quartz sand pickling efficiency higher and at the same time helping to improve the pickling effect.

[0081] Furthermore, by executing step S20 and step S50, the pickling liquid is heated and the temperature is controlled, so that during the entire pickling reaction time, the temperature in the fluidized barrel 121 can be stably maintained within a specific temperature range, thereby avoiding the inability to completely remove impurities on the surface of the quartz sand due to too low a temperature, and avoiding the quartz sand being in a fluffy state due to the expansion of the quality system due to too high a temperature (generally above 80°C), which makes the quartz sand prone to cracks, and is beneficial to improving the stability and reliability of the pickling effect.

[0082] Therefore, the adoption of the above-mentioned high-purity quartz sand pickling method can reduce the amount of acid used, reduce the types of acid used, and improve the pickling efficiency and pickling effect of quartz sand.

[0083] Please also read Figure 6 In some embodiments, a reflux port 1216 connected to the spray pipe 122 is further provided at the top of the fluidizing barrel 121, and a discharge port 1217 connected to the reflux port 1216 is further provided at the bottom of the fluidizing barrel 121. A reflux valve 1302 and a reflux pump 1303 are provided on the connecting passage between the discharge port 1217 and the reflux port 1216.

[0084] Step S50 includes step S51 and step S52.

[0085] Step S51, close the acid supply main valve 139 and the upper acid inlet control valve 133, so that the passage from the reversing control valve 134 to the lower inlet and outlet 1214, the aeration control valve 1301 and the high-temperature aeration device 140 are all in the open state, so that the quartz sand to be pickled and the pickling liquid in the fluidized barrel 121 react at the preset insulation temperature for the first preset time period.

[0086] Step S52, close the high-temperature aeration device 140, the aeration control valve 1301 and the reversing control valve 134, open the reflux valve 1302 and the reflux pump 1303, so as to pump the mixture of quartz sand and pickling liquid in the fluidizing barrel 121 from the discharge port 1217 to the reflux port 1216, and use the nozzle 123 to spray it into the upper part of the fluidizing barrel 121, so that the quartz sand to be pickled and the pickling liquid in the fluidizing barrel 121 react at the preset insulation temperature for a second preset time period.

[0087] The sum of the first preset time period and the second preset time period is the preset duration. Specifically, the first preset time period is 3 to 4 hours, and the second preset time period is 2 to 4 hours.

[0088] In this way, by executing step S51, the quartz sand and the pickling liquid in the fluidizing barrel 121 react for the first preset time period at the preset insulation temperature, so that the quartz sand and the pickling liquid undergo a chemical reaction, and fully react under the stirring of the high-temperature and high-pressure gas entering from the lower inlet and outlet 1214, so that the surface layer and shallow impurities of the quartz sand are separated; after the insulation reaction for the first preset time period, the quartz sand and impurities settle to the bottom of the fluidizing barrel 121. At this time, the high-temperature and high-pressure gas alone cannot achieve the uniform effect. At this time, step S52 is executed again to pump the mixture of quartz sand and pickling liquid at the bottom of the fluidizing barrel 121 into the spray pipe 122, and spray it to the upper end of the fluidizing barrel 121 through multiple nozzles 123, forming a circulation of the sand and gravel mixture, so as to achieve the secondary sand mixing effect, further improve the pickling effect, further shorten the pickling reaction time, and help to further improve the pickling efficiency.

[0089] In some embodiments, the pickling fluidization device 120 further includes a homogenizer 124 , which is installed at the sand inlet 1212 . The homogenizer 124 is configured to disperse the quartz sand to be pickled through the sand inlet 1212 .

[0090] Step S40 is: adding the quartz sand to be pickled into the sand inlet 1212 , and using the homogenizer 124 installed in the sand inlet 1212 to disperse the quartz sand to be pickled passing through the sand inlet 1212 .

[0091] The homogenizer 124 may be a mesh structure, a grid structure formed by cross beams and longitudinal beams interlaced with each other, or a perforated plate structure with many through holes.

[0092] When executing step S40, the quartz sand to be pickled is directly added to the homogenizer 124, and under the action of its own gravity and the impact force of the newly added quartz sand, the quartz sand to be pickled can pass through the homogenizer 124 and enter the fluidizing barrel 121, so that the quartz sand to be pickled is dispersed at the sand inlet 1212, ensuring that the quartz sand can fall in the fluidizing barrel 121 with uniformly distributed particles, and fully contact with the pickling liquid sprayed by multiple nozzles 123 in step S30, thereby improving the initial acid cleaning effect and making the pickling effect and pickling efficiency higher.

[0093] Please also read Figure 7 In some embodiments, the pipeline assembly 130 also includes a cleaning water pipe 1304 and a cleaning control valve 1305 disposed on the cleaning water pipe 1304. One end of the cleaning water pipe 1304 is connected to the upper acid inlet 1211, and the other end is used to connect to an external water source.

[0094] After step S80 , steps S90 to 102 are also included.

[0095] Step S90 , opening the high temperature aeration device 140 , the aeration control valve 1301 and the cleaning control valve 1305 , closing the reversing control valve 134 , the sand output control valve 136 and the sand output pump 138 , and using the nozzle 123 to spray water onto the inner wall of the fluidizing barrel 121 .

[0096] Step S101 , opening the channel of the reversing control valve 134 toward the lower inlet and outlet 1214 , so as to spray high-temperature and high-pressure gas into the fluidizing barrel 121 through the lower inlet and outlet 1214 , so as to stir and clean the inner wall of the lower end of the fluidizing barrel 121 .

[0097] Step S102 , closing the high temperature aeration device 140 and the aeration control valve 1301 , and opening the acid discharge control valve 135 and the acid discharge pump 137 to pump out the sewage in the fluidized tank 121 .

[0098] By executing step S90, the high-temperature and high-pressure gas provided by the high-temperature aeration device 140 is used to provide power for the water of the external water source, so as to ensure that the water entering the spray pipe 122 can be sprayed onto the inner wall of the fluidizing barrel 121 opposite the nozzle 123 through the nozzle 123, so as to achieve the purpose of flushing the inner wall of the fluidizing barrel 121. By executing step S101, the high-temperature and high-pressure gas provided by the high-temperature aeration device 140 is used to stir the water at the bottom of the fluidizing barrel 121 to quickly clean the inner wall of the bottom of the fluidizing barrel 121. In this way, by executing steps S90 and S101, the inner wall of the fluidizing barrel 121 can be quickly cleaned, and by executing step S102, the cleaned sewage is pumped out to achieve automatic cleaning of the fluidizing barrel 121, avoiding workers from entering the fluidizing barrel 121 for cleaning, and reducing the risk of personnel operation.

[0099] Of course, in order to ensure the cleaning effect in the fluidized barrel 121, the above steps S90 to S102 can be repeatedly performed.

[0100] Furthermore, in some embodiments, after step S102, step S103 is further included:

[0101] Step S103 , opening the high temperature aeration device 140 , the aeration control valve 1301 , and the channel of the reversing control valve 134 toward the lower inlet and outlet 1214 , so as to use the high temperature and high pressure gas provided by the high temperature aeration device 140 to dry the inner wall of the fluidizing barrel 121 .

[0102] By executing step S103, the inner wall of the fluidized bed barrel 121 after cleaning is dried, and the water after cleaning the fluidized bed barrel 121 is reduced to remain in the fluidized bed barrel 121 for a long time and cause mildew, thereby affecting the next quartz sand pickling effect. Therefore, the setting of step S103 can improve the reliability of quartz sand pickling.

[0103] It should be noted that, in an embodiment of the present invention, when there are multiple reversing control valves 134 and lower inlet and outlet 1214, in the process of executing the above steps, when closing the reversing control valve 134, opening the channel of the reversing control valve 134 toward the lower inlet and outlet 1214, and opening the channel of the reversing control valve 134 away from the lower inlet and outlet 1214, multiple reversing control valves 134 are closed at the same time, and the channel toward the lower inlet and outlet 1214 is opened at the same time, or the channel away from the lower inlet and outlet 1214 is opened at the same time.

[0104] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-purity quartz sand pickling system, characterized in that: include: The acid preparation device comprises an acid preparation barrel, a stirring mechanism and a heating element; the top of the acid preparation barrel is provided with a first acid addition port, a second acid addition port and a water addition port; the bottom of the acid preparation barrel is provided with an acid supply port; the stirring mechanism is installed in the acid preparation barrel and is configured to stir and mix the pickling solution in the acid preparation barrel; the heating element is used to heat the mixed pickling solution in the acid preparation barrel to a preset preheating temperature; A pickling fluidized device comprises a fluidized barrel, a spray pipe and a plurality of nozzles arranged on the spray pipe at intervals along the extension direction of the spray pipe; the top of the fluidized barrel is provided with an upper acid inlet, a sand inlet and an exhaust port; the bottom of the fluidized barrel is provided with a lower inlet and an acid exhaust port; the spray pipe is spirally arranged on the inner wall of the fluidized barrel near the top along the height direction of the fluidized barrel and is connected with the upper acid inlet; The pickling fluidized device further comprises a homogenizer; the homogenizer is installed at the sand inlet; the homogenizer is configured to disperse the quartz sand to be pickled through the sand inlet; The homogenizer comprises a bottom plate and a side plate arranged along the circumference of the bottom plate and connected to the bottom plate; the outer wall of the side plate is fixedly connected to the edge of the sand inlet, and the bottom plate is located in the fluidizing barrel; a plurality of sand inlet holes are arranged at intervals on the bottom plate; a plurality of sand passing grooves are arranged at intervals on the edge where the side plate is connected to the bottom plate along the circumference of the bottom plate; The top of the fluidized barrel is also provided with a reflux port connected to the spray pipe, and the bottom of the fluidized barrel is also provided with a discharge port connected to the reflux port; a reflux valve and a reflux pump are provided on the communication passage between the discharge port and the reflux port; the mixture of the pickling liquid and the quartz sand at the bottom of the fluidized barrel can be pumped to the reflux port through the discharge port by the reflux pump and the reflux valve, and sprayed to the upper end of the fluidized barrel through the spray pipe and multiple nozzles, so as to achieve stirring of the pickling liquid and the quartz sand in the fluidized barrel; A pipeline assembly, comprising a sand discharge pipe, an acid discharge pipe, an upper acid inlet control valve, a reversing control valve, an acid discharge control valve, a sand discharge control valve, an acid discharge pump, a sand discharge pump, an acid supply main valve, an aeration control valve and a venturi tube; one end of the sand discharge pipe is connected to the lower inlet and outlet through the reversing control valve; one end of the acid discharge pipe is connected to the acid discharge port; the acid discharge control valve and the acid discharge pump are both arranged on the acid discharge pipe; the sand discharge control valve and the sand discharge pump are both arranged on the sand discharge pipe; the acid supply port is connected to the middle part of the venturi tube through the acid supply main valve; the outlet end of the venturi tube is respectively connected to the upper acid inlet through the upper acid inlet control valve and to the lower inlet and outlet through the reversing control valve; The high temperature aeration device has an air outlet which is connected to the inlet end of the venturi tube through the aeration control valve.

2. The high-purity quartz sand pickling system according to claim 1 is characterized in that: The pipeline assembly also includes a cleaning water pipe and a cleaning control valve arranged on the cleaning water pipe; one end of the cleaning water pipe is connected to the upper acid inlet, and the other end is used to connect to an external water source; and / or The outer wall of the fluidizing barrel is provided with a heat-insulating structural layer; and / or The fluidizing barrel comprises an upper end plate, a lower end plate spaced apart from the upper end plate, an upper side plate arranged along the circumference of the upper end plate and connected to the upper end plate, and a lower side plate arranged along the circumference of the lower end plate and connected to the lower end plate; one end of the upper side plate away from the upper end plate is connected to one end of the lower side plate away from the lower end plate; in the height direction of the fluidizing barrel, the orthographic projection of the upper end plate on the lower end plate completely covers the lower end plate; the inner diameter of the lower side plate gradually decreases along the direction from the upper end plate to the lower end plate; the upper acid inlet, the sand inlet and the exhaust port are all located on the upper end plate; the lower inlet and outlet are located on the lower end plate; the acid exhaust port is located at a position of the lower side plate close to the lower end plate; the spray pipe is installed on the inner wall of the upper side plate.

3. A high-purity quartz sand pickling method, applied to the high-purity quartz sand pickling system as claimed in claim 1, characterized in that: The high-purity quartz sand pickling method comprises the steps of: Adding hydrofluoric acid, oxalic acid and water into the acid preparation barrel through the first acid adding port, the second acid adding port and the water adding port in a preset ratio, and stirring and mixing by the stirring mechanism to obtain an acid washing solution; Preheating the pickling solution to a preset preheating temperature by using the heating element; Open the high-temperature aeration device, open the acid supply main valve, the upper acid inlet control valve, the passage of the reversing control valve toward the lower inlet and outlet, and the aeration control valve, so as to spray the preheated acid washing liquid into the fluidizing barrel through the nozzle and the lower inlet and outlet respectively; While acid is being fed into the fluidized barrel, quartz sand to be acid-washed is added into the fluidized barrel through the sand inlet; Close the acid supply main valve and the upper acid inlet control valve, so that the passage of the reversing control valve toward the lower inlet and outlet, the aeration control valve and the high-temperature aeration device are all in an open state, so that the quartz sand to be pickled and the pickling liquid in the fluidized tank react at a preset insulation temperature for a preset time; the preset insulation temperature is 60°C to 70°C; The high-temperature aeration device, the aeration control valve and the reversing control valve are closed, and the acid discharge control valve and the acid discharge pump are opened to extract the pickling liquid in the fluidized tank through the acid discharge pipe; The high-temperature aeration device, the aeration control valve, the passage of the reversing control valve away from the lower inlet and outlet, and the sand discharge control valve are opened, and the purified quartz sand in the fluidized tank falls into the sand discharge pipe through the lower inlet and outlet, and is moved by the high-temperature and high-pressure gas provided by the high-temperature aeration device; When the purified quartz sand is pushed to the sand discharge pump, the sand discharge pump is turned on, and the high-temperature aeration device and the aeration control valve are closed to carry out the unloading of the purified quartz sand.

4. The high-purity quartz sand pickling method according to claim 3, characterized in that: The top of the fluidizing barrel is also provided with a reflux port connected to the spray pipe, the bottom of the fluidizing barrel is also provided with a discharge port connected to the reflux port, and a reflux valve and a reflux pump are provided on the communication passage between the discharge port and the reflux port; The step of allowing the quartz sand to be pickled and the pickling liquid in the fluidized barrel to react at a preset insulation temperature for a preset time period comprises the steps of: Close the acid supply main valve and the upper acid inlet control valve, so that the passage from the reversing control valve to the lower inlet and outlet, the aeration control valve and the high-temperature aeration device are all in an open state, so that the quartz sand to be pickled and the pickling liquid in the fluidized tank react at a preset insulation temperature for a first preset time period; The high-temperature aeration device, the aeration control valve and the reversing control valve are closed, and the reflux valve and the reflux pump are opened to pump the mixture of the quartz sand and the pickling liquid in the fluidizing barrel from the discharge port to the reflux port, and spray the mixture into the upper part of the fluidizing barrel by the nozzle, so that the quartz sand to be pickled and the pickling liquid in the fluidizing barrel react at the preset insulation temperature for a second preset time period; The sum of the first preset time period and the second preset time period is the preset duration.

5. The high-purity quartz sand pickling method according to claim 3, characterized in that: The pickling fluidized device further comprises a homogenizer; the homogenizer is installed at the sand inlet; the homogenizer is configured to disperse the quartz sand to be pickled through the sand inlet; The step of adding the quartz sand to be pickled into the fluidized barrel is as follows: adding the quartz sand to be pickled into the sand inlet, and dispersing the quartz sand to be pickled passing through the sand inlet by using a homogenizer installed in the sand inlet.

6. The high-purity quartz sand pickling method according to claim 3, characterized in that: The pipeline assembly also includes a cleaning water pipe and a cleaning control valve arranged on the cleaning water pipe, one end of the cleaning water pipe is connected to the upper acid inlet, and the other end is used to connect to an external water source; After the step of unloading the purified quartz sand, the following steps are also included: Open the high-temperature aeration device, the aeration control valve and the cleaning control valve, close the reversing control valve, the sand output control valve and the sand output pump, and use the nozzle to spray water to the inner wall of the fluidizing barrel; Opening the channel of the reversing control valve toward the lower inlet and outlet to spray high-temperature and high-pressure gas into the fluidizing barrel through the lower inlet and outlet to stir and clean the inner wall of the lower end of the fluidizing barrel; The high-temperature aeration device and the aeration control valve are closed, and the acid discharge control valve and the acid discharge pump are opened to pump out the sewage in the fluidized tank.

7. The high-purity quartz sand pickling method according to claim 6, characterized in that: After the step of pumping out the sewage in the fluidized barrel, the method further comprises the following steps: The high-temperature aeration device, the aeration control valve, and the passage of the reversing control valve toward the lower inlet and outlet are opened to dry the inner wall of the fluidizing barrel with the high-temperature and high-pressure gas provided by the high-temperature aeration device.

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