A device for removing gas-liquid inclusions in quartz sand

Abstract

The application discloses a device for removing gas-liquid inclusions in quartz sand and relates to the technical field of quartz sand processing. The device for removing gas-liquid inclusions in quartz sand comprises a feeding pretreatment unit, a segmented gradient temperature roasting unit, a negative pressure and explosion unit, a water quenching and prewashing unit, an ultrasonic enhanced countercurrent acid leaching unit and a drying and discharging unit. The negative pressure and explosion unit comprises a sealed negative pressure rotary reaction cylinder, a rotary sealing structure and a vacuum carrier gas and distribution system. A double-layer composite lining is arranged on the inner wall of the cylinder base of the negative pressure rotary reaction cylinder. A ceramic material lifting plate assembly is arranged on the inner wall of the negative pressure rotary reaction cylinder, which can continuously lift the material to form a uniform material curtain during rotation. The ceramic material lifting plate assembly comprises ceramic material lifting plates which are fixed on the inner wall of the ceramic lining plate in an axial direction and are arranged in a spiral array in an inclined manner. The quartz sand particles are fully exposed to the high-temperature negative pressure and chlorine atmosphere environment in the cylinder, and the uniformity of the explosion of the gas-liquid inclusions is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of quartz sand processing technology, specifically to a device for removing gas-liquid inclusions from quartz sand. Background Technology

[0002] Quartz sand is a key raw material for high-end industries such as photovoltaics, semiconductors, and optoelectronics. The material contains numerous micron- and submicron-sized gas-liquid inclusions, which are typical inherent defects in quartz sand. During downstream device processing and high-temperature operation, these inclusions can undergo thermal expansion, phase transformation, or even rupture, leading to various problems such as bubbles, cracking, and abnormal light transmission in the product. The content of gas-liquid inclusions directly determines the grade of the quartz sand and significantly affects the reliability of end-use devices. Therefore, the efficient removal of gas-liquid inclusions is a crucial and indispensable process in the purification and processing of quartz sand.

[0003] Currently, various treatment methods have been developed in the industry for gas-liquid inclusions in quartz sand, but all existing technologies have unavoidable technical shortcomings. Traditional thermal detonation relies on high-temperature heating to cause the internal medium of the inclusions to expand and burst, requiring the quartz sand to be treated at very high temperatures. Prolonged exposure to high temperatures can easily cause sintering and adhesion of quartz particles and irreversible damage to the quartz crystal lattice, resulting in decreased transparency and overall product quality degradation. Furthermore, traditional thermal detonation has limited effectiveness against submicron-sized gas-liquid inclusions. These tiny inclusions lack sufficient expansion driving force, leading to incomplete removal and leaving a large number of fine inclusions remaining within the quartz matrix after treatment, failing to meet the performance requirements of high-end products.

[0004] Meanwhile, most existing vacuum processing equipment adopts an intermittent batch production mode. After processing each batch of material, the vacuum inside the cylinder needs to be broken during both the feeding and discharging stages. After material replacement, the vacuum is then re-established to create the necessary negative pressure environment. This repeated vacuum breaking and re-establishment operation is not only cumbersome and time-consuming, resulting in low overall production efficiency, but also causes significant energy loss. Furthermore, the rotary sealing structure of conventional rotary vacuum furnaces has design flaws. Under rotary friction conditions, gas leakage is prone to occur at the sealing points. External air intrusion into the furnace causes continuous fluctuations in the vacuum condition inside the cylinder, directly leading to unstable pressure differential driving force required for inclusion rupture. This results in significant differences in inclusion rupture effectiveness between different batches and even between different particles within the same batch, making it difficult to guarantee product consistency and hindering the large-scale, stable production of quartz sand.

[0005] Therefore, there is an urgent need in this field to develop a quartz sand gas-liquid inclusion removal device that can achieve continuous operation and lower processing temperature, while having excellent dynamic sealing performance and stable and reliable overall operation, so as to overcome many defects of existing processes and equipment and meet the high-end industry's demand for large-volume, high-quality quartz sand production. Summary of the Invention

[0006] The purpose of this invention is to provide a device for removing gas-liquid inclusions in quartz sand, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for removing gas-liquid inclusions in quartz sand, comprising a feeding pretreatment unit, a segmented gradient heating and roasting unit, a negative pressure synergistic bursting unit, a water quenching prewashing unit, an ultrasonically enhanced countercurrent acid leaching unit, and a drying and discharging unit arranged in series along the material flow direction;

[0008] A rotary locking and sealing connection mechanism is provided between the roasting unit and the negative pressure co-explosion unit;

[0009] The negative pressure synergistic explosion unit adopts a horizontal continuous rotary structure, including a sealed negative pressure rotary reaction cylinder, a rotary sealing structure, and a vacuum carrier gas synergistic distribution system.

[0010] The base of the negative pressure rotary reaction cylinder is made of stainless steel, and the inner wall is provided with a double-layer composite lining, which includes a bottom corrosion-resistant layer and a top ceramic lining plate; the negative pressure rotary reaction cylinder is installed at an angle.

[0011] The inner wall of the negative pressure rotary reaction cylinder is equipped with a ceramic lifting plate assembly, which continuously lifts the material to form a uniform material curtain during rotation.

[0012] The ceramic lifting plate assembly includes ceramic lifting plates that are uniformly fixed along the inner wall of the ceramic liner, and the ceramic lifting plates are arranged in a spiral array at an incline.

[0013] The rotary sealing structure is respectively installed at the feed end and discharge end of the negative pressure rotary reaction cylinder;

[0014] The rotary locking and sealing connection mechanism includes a rotary locking valve and a transition isolation hopper;

[0015] The rotary locking valve includes a valve box, an electric rotating shaft is assembled in the middle of the valve box, and a fan-shaped segmented hopper adapted to the valve box is uniformly fixed to the electric rotating shaft in the circumferential direction.

[0016] The valve box has a feed end at the top and a discharge end at the bottom side. Both the feed end and the discharge end are adapted to a fan-shaped compartmentalized hopper.

[0017] As a preferred embodiment of the present invention, the ceramic lifting plate has staggered and interlaced wave teeth at its ends; the ceramic lifting plate has an arc-shaped guide groove facing the material lifting direction, and the surface of the ceramic lifting plate has a through wedge-shaped pressure relief groove.

[0018] The wedge-shaped pressure relief groove is flared wedge-shaped from the material receiving side to the material back side.

[0019] As a preferred technical solution of the present invention, the rotary sealing structure comprises, from the inside out, an inner layer of flexible graphite packing seal, a middle layer of labyrinth tooth structure, and an outer layer of nitrogen gas sealing cavity.

[0020] The flexible graphite packing seal is adapted to high-temperature rotary friction conditions.

[0021] The labyrinth tooth structure is used to extend the gas leakage path;

[0022] The nitrogen gas sealing cavity is used to introduce nitrogen gas to form a reverse air curtain to prevent outside air from seeping in.

[0023] The rotary sealing structure at the discharge end of the reaction cylinder is inserted below the liquid surface of the water quenching tank in the water quenching pre-washing unit to form a liquid seal as a sealing guarantee.

[0024] The rotary sealing structure at the feed end of the reaction cylinder is connected to the rotary locking sealing connection mechanism.

[0025] As a preferred embodiment of the present invention, the valve box feed end is equipped with a sensor for controlling the electric rotating shaft;

[0026] The valve box discharge end is connected to the expansion pipe;

[0027] After the sensor detects that the fan-shaped compartment hopper is full, it triggers the electric shaft to rotate, rotating the fully loaded fan-shaped compartment hopper to the bottom for unloading. Quartz sand is always left in the fan-shaped compartment hopper to form a solid particle material seal.

[0028] The valve box feed end is connected to the roasting unit.

[0029] As a preferred embodiment of the present invention, the transition isolation hopper is located downstream of the rotary locking valve and includes a hopper cylinder, wherein a spiral conveyor plate is provided inside the hopper cylinder;

[0030] The discharge end of the silo is connected to the feed end of the reaction cylinder through a rotary sealing structure, and the feed end of the silo is rotatably connected to the expansion pipe.

[0031] When the transition isolation silo rotates synchronously with the negative pressure rotary reactor, it conveys materials through a spiral conveyor plate, and the materials between the spiral conveyor plates form an auxiliary material seal.

[0032] As a preferred embodiment of the present invention, the silo wall is provided with a nitrogen injector, a pressure relief device and a pressure detector;

[0033] The nitrogen injector is located at the top of the silo and is biased towards the roasting unit; the nitrogen injector discharges gas through one end of the spiral conveyor plate to introduce inert gas into the silo to build an intermediate buffer pressure.

[0034] The exhaust pressure relief device is located at the bottom of the silo; the exhaust pressure relief device draws in gas through the other end of the spiral conveyor plate to discharge the roasting flue gas and mixed gas that have entered the silo.

[0035] The pressure detector is located outside the silo and biased towards the negative pressure co-bursting unit. The pressure detector is used to collect the pressure inside the silo in real time and adjust the nitrogen injector and the vacuum relief device in conjunction to stably maintain the gradient pressure relationship between the calcination unit, the transition isolation silo and the negative pressure co-bursting unit.

[0036] As a preferred embodiment of the present invention, the outer wall of the cylinder base is wrapped with a heat insulation layer, and three independently temperature-controlled infrared heating coils are arranged inside the heat insulation layer, which are, in sequence, a constant temperature feeding section, a mid-section strengthening section, and a discharge maintenance section along the material flow direction.

[0037] As a preferred technical solution of the present invention, the vacuum carrier gas cooperative distribution system includes a vacuum extraction system, a carrier gas distribution system, and an optimized airflow organization structure.

[0038] The vacuum extraction system includes a pump body and a main extraction port that are interconnected.

[0039] The pump body adopts a two-stage unit structure consisting of a Roots vacuum pump and a water ring vacuum pump;

[0040] The main air extraction port is located in the middle section of the top of the cylinder base, and a ceramic filter tube is installed at the front end of the main air extraction port;

[0041] The carrier gas distribution system includes an annular gas distributor embedded between ceramic liners, and the annular gas distributor is assembled on the material-facing surface of the ceramic feeder assembly.

[0042] The annular gas distributor has inclined micro-holes on its inner side facing the material curtain, which are used to spray out a mixture of hydrogen chloride and nitrogen gas and form a countercurrent contact with the falling material curtain.

[0043] The optimized airflow organization structure includes auxiliary air extraction ports located at the feed end and discharge end of the reaction cylinder, respectively.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] (1) A device for removing gas-liquid inclusions in quartz sand, wherein the ceramic lifting plate assembly adopts a composite structure of arc-shaped guide groove and top turbulent wave teeth and is arranged in an inclined spiral array. During the rotation of the cylinder base, the quartz sand is lifted to form a uniform thin curtain of material, and the particles are separated from each other, so that the quartz sand particles are fully exposed to the high temperature negative pressure and chlorination atmosphere environment inside the cylinder, which effectively improves the uniformity of gas-liquid inclusion bursting and reduces the risk of local under-bursting and over-sintering.

[0046] (2) A device for removing gas-liquid inclusions in quartz sand, wherein the ceramic feeding plate is provided with a wedge-shaped pressure relief groove with a narrow opening on the feeding side and an expanded opening on the back side. The wedge-shaped pressure relief groove opens up the airflow channel of the plate, so that the high-temperature carrier gas of hydrogen chloride and nitrogen can penetrate into the interior of the material layer and construct a three-dimensional gas-solid contact environment. This not only ensures the stability of the negative pressure difference inside the material layer and avoids insufficient driving force for inclusion bursting due to pressure difference decay, but also enhances the efficiency of gas phase chlorination and impurity removal reaction and improves the removal effect of impurities inside submicron inclusions.

[0047] (3) A device for removing gas-liquid inclusions in quartz sand, wherein the feed end and the discharge end of the reaction cylinder are equipped with independent rotary sealing structures with three-layer sealing cavities. The rotary sealing structure at the discharge end of the reaction cylinder is inserted below the liquid surface of the water quenching tank to form a liquid seal, forming a fourth layer of sealing protection. The three-layer sealing structure and the liquid seal at the discharge end of the reaction cylinder work together to further block the outside air from being sucked back into the negative pressure rotary reaction cylinder through the material end, significantly reducing the overall dynamic seal leakage rate, suppressing the vacuum fluctuation in the negative pressure rotary reaction cylinder, and stably maintaining the negative pressure conditions required for the bursting of gas-liquid inclusions, so as to realize the continuous and reliable operation of the vacuum condition under the continuous feeding and discharging process of the negative pressure rotary reaction cylinder.

[0048] (4) A device for removing gas-liquid inclusions in quartz sand, wherein when the sensor detects that the fan-shaped compartment hopper is full, it triggers rotation, and the fan-shaped compartment hopper fully loaded with quartz sand is rotated to the bottom to complete the material unloading and conveying; during the unloading process of the fan-shaped compartment hopper, a certain thickness of quartz sand particles will always remain in the valve box, thereby continuously constructing a stable and reliable solid particle material seal, effectively blocking the large-scale gas flow between the two units, and providing key guarantee for the negative pressure collaborative bursting unit to maintain a stable working vacuum.

[0049] (5) A device for removing gas-liquid inclusions in quartz sand, wherein the material continuously filled and accumulated between the spiral conveyor plates can form an auxiliary material seal, further hindering the gas flow between the roasting unit and the negative pressure co-explosion unit, and together with the front-end rotary locking valve, it can enhance the gas barrier capability and reduce the leakage of harmful gases across units.

[0050] (6) A device for removing gas-liquid inclusions in quartz sand, wherein the transition isolation silo works in concert with a nitrogen injector, a vacuum depressurizer and a pressure detector to stably maintain the gradient pressure relationship between the calcination unit, the transition isolation silo and the negative pressure co-explosion unit, reduce the intrusion of water vapor and oxidizing gas into the hydrogen chloride atmosphere, reduce the equipment operation and maintenance load, and ensure the stability of the vacuum condition of the negative pressure co-explosion unit.

[0051] (7) A device for removing gas-liquid inclusions in quartz sand, wherein in a negative pressure high-temperature environment inside a negative pressure rotary reactor, the inclusions inside the quartz sand burst under a stable pressure difference, and the exposed impurities react with hydrogen chloride to form low-boiling-point metal chlorides. These chlorides are easily vaporized under high temperature and negative pressure conditions and are carried out of the negative pressure rotary reactor with the exhaust gas flow, thereby achieving gas-phase pre-removal of impurities; giving full play to the synergistic effect of physical bursting and gas-phase chemical impurity removal, improving the pre-removal rate of alkali metal impurities, and effectively shortening the subsequent acid leaching treatment time.

[0052] (8) A device for removing gas-liquid inclusions in quartz sand, wherein a main exhaust port in the middle section of the top of the negative pressure rotary reactor and auxiliary exhaust ports at the feed end and discharge end of the reactor are set to construct a flow field inside the negative pressure rotary reactor with a main exhaust port in the middle and auxiliary exhaust ports at both ends and an air intake port; in conjunction with an annular gas distributor, the mixed gas is uniformly sprayed out through inclined micro-holes arranged towards the material curtain, forming a countercurrent contact with the falling and dispersed quartz sand material curtain, so as to promote the uniform distribution of the carrier gas inside the cylinder matrix without dead corners; the vacuum inside the negative pressure rotary reactor is stably maintained, providing a continuous and stable differential pressure driving force for the inclusion bursting, thereby improving the inclusion bursting rate. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of the present invention;

[0054] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0055] Figure 3 This is a schematic diagram of the insulation layer of the present invention;

[0056] Figure 4 This is a schematic diagram showing the location of the ceramic feeding plate assembly of the present invention;

[0057] Figure 5 This is a schematic diagram of the ceramic feeding plate assembly of the present invention;

[0058] Figure 6 This is a schematic diagram of the annular gas distributor of the present invention;

[0059] Figure 7 This is a schematic diagram of the vacuum extraction system of the present invention;

[0060] Figure 8 This is a schematic diagram of the rotary sealing structure of the present invention;

[0061] Figure 9 This is a schematic diagram of the transition isolation silo of the present invention;

[0062] Figure 10 This is a schematic diagram of the rotary locking valve of the present invention.

[0063] In the picture:

[0064] 101. Feeding pretreatment unit; 102. Calcination unit; 103. Water quenching and pre-washing unit; 104. Acid leaching unit; 105. Drying and discharging unit;

[0065] 2. Negative pressure rotary reactor; 201. Reactor body base; 202. Corrosion-resistant layer; 203. Ceramic liner; 204. Reactor feed end; 205. Reactor discharge end; 206. Insulation layer;

[0066] 3. Ceramic lifting plate assembly; 301. Ceramic lifting plate; 302. Corrugated teeth; 303. Arc-shaped guide groove; 304. Wedge-shaped pressure relief groove;

[0067] 4. Rotary sealing structure;

[0068] 5. Rotary locking valve; 501. Valve box; 502. Electric rotating shaft; 503. Sector-shaped segmented hopper; 504. Valve box feed end; 505. Valve box discharge end; 506. Sensor; 507. Expander pipe;

[0069] 6. Transition isolation silo; 601. Silo cylinder; 602. Screw conveyor plate; 603. Nitrogen injector; 604. Vacuum relief device; 605. Pressure detector;

[0070] 7. Vacuum carrier gas cooperative distribution system;

[0071] 701. Pump body; 702. Main air intake port;

[0072] 703. Annular gas distributor; 704. Inclined micropores;

[0073] 705. Auxiliary air extraction port. Detailed Implementation

[0074] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] Example: Please refer to Figures 1-10A device for removing gas-liquid inclusions in quartz sand includes a feeding pretreatment unit 101, a segmented gradient heating calcination unit 102, a negative pressure synergistic bursting unit, a water quenching prewashing unit 103, an ultrasonically enhanced countercurrent acid leaching unit 104, and a drying and discharging unit 105, arranged sequentially in series along the material flow direction. A tail gas and waste liquid recycling treatment unit is also provided. A rotary locking and sealing connection mechanism is provided between the calcination unit 102 and the negative pressure synergistic bursting unit. The negative pressure synergistic bursting unit adopts a horizontal continuous rotary structure, including a sealed negative pressure rotary reaction cylinder 2, a rotary sealing structure 4, and a vacuum carrier gas synergistic distribution system 7. The cylinder base 201 of the negative pressure rotary reaction cylinder 2 is made of stainless steel, and the inner wall is provided with a double-layer composite lining, which includes a bottom corrosion-resistant layer 202 and a top ceramic lining plate 203. The negative pressure rotary reaction cylinder 2 is installed at an angle. The inner wall of the cylinder 2 is fitted with a ceramic lifting plate assembly 3, which continuously lifts the material to form a uniform material curtain during rotation; the ceramic lifting plate assembly 3 includes ceramic lifting plates 301 uniformly fixed along the axial direction of the inner wall of the ceramic liner 203, and the ceramic lifting plates 301 are arranged in a spiral array at an inclined angle; a rotary sealing structure 4 is respectively set at the feed end 204 and the discharge end 205 of the negative pressure rotary reaction cylinder 2; the rotary locking sealing connection mechanism includes a rotary lock The material valve 5 and the transition isolation hopper 6; the rotary locking material valve 5 includes a valve box 501, an electric rotating shaft 502 is assembled in the middle of the valve box 501, and a fan-shaped segmented hopper 503 adapted to the valve box 501 is uniformly fixed to the electric rotating shaft 502 in the circumference; a valve box inlet end 504 is opened at the upper part of the valve box 501, and a valve box outlet end 505 is opened on the lower side of the valve box 501. Both the valve box inlet end 504 and the valve box outlet end 505 are adapted to the fan-shaped segmented hopper 503.

[0076] The ceramic lifting plate 301 has staggered and interlaced wave teeth 302 at its ends; the ceramic lifting plate 301 has an arc-shaped guide groove 303 facing the material lifting direction, and the ceramic lifting plate 301 has a through wedge-shaped pressure relief groove 304 on its surface; the wedge-shaped pressure relief groove 304 is flared wedge-shaped from the material receiving side to the material receiving side, and the width of the narrow opening on the material receiving side is less than the minimum feed particle size of the quartz sand.

[0077] The rotary sealing structure 4, from the inside out, includes an inner flexible graphite packing seal, a middle labyrinth tooth structure, and an outer nitrogen gas sealing cavity. The flexible graphite packing seal is suitable for high-temperature rotary friction conditions. The labyrinth tooth structure is used to extend the gas leakage path. The nitrogen gas sealing cavity is used to introduce nitrogen and form a reverse gas curtain to prevent outside air from seeping in. The rotary sealing structure 4 at the discharge end 205 of the reaction cylinder is inserted below the liquid level of the water quenching tank of the water quenching pre-washing unit 103 to form a liquid seal as a sealing guarantee. The rotary sealing structure 4 at the feed end 204 of the reaction cylinder is connected to a rotary locking material sealing connection mechanism.

[0078] The valve box feed end 504 is equipped with a sensor 506 that controls the electric rotating shaft 502; the valve box discharge end 505 is connected to the expansion pipe 507; after the sensor 506 senses that the fan-shaped compartment hopper 503 is full, it triggers the electric rotating shaft 502 to rotate, rotating the fan-shaped compartment hopper 503 full of quartz sand to the bottom for unloading, and quartz sand is always left in the fan-shaped compartment hopper 503 to form a solid particle material seal; the valve box feed end 504 is connected to the roasting unit 102.

[0079] The transition isolation silo 6 is located downstream of the rotary locking valve 5 and includes a silo cylinder 601. A spiral conveyor plate 602 is installed inside the silo cylinder 601. The discharge end of the silo cylinder 601 is connected to the feed end 204 of the reaction cylinder through a rotary sealing structure 4. The feed end of the silo cylinder 601 is rotatably connected to the expansion pipe 507. When the transition isolation silo 6 rotates synchronously with the negative pressure rotary reaction cylinder 2, it conveys materials through the spiral conveyor plate 602. The materials between the spiral conveyor plates 602 form an auxiliary material seal.

[0080] The silo 601 is equipped with a nitrogen injector 603, a pressure relief device 604, and a pressure detector 605 on its walls. The nitrogen injector 603 is located at the top of the silo 601 and is biased towards the roasting unit 102. The nitrogen injector 603 discharges gas through one end of the spiral conveyor plate 602 to introduce inert gas into the silo 601 to build an intermediate buffer pressure. The pressure relief device 604 is located at the bottom of the silo 601. The pressure relief device 604 draws in gas through the other end of the spiral conveyor plate 602 to discharge roasting flue gas and mixed gas that have entered the silo 601. The pressure detector 605 is also included. Device 605 is located outside the silo 601 and biased towards the negative pressure co-explosion unit; pressure detector 605 is used to collect the pressure inside the silo 601 in real time and to adjust the nitrogen injector 603 and the vacuum relief device 604 in conjunction to stably maintain the gradient pressure relationship between the calcination unit 102, the transition isolation silo 6 and the negative pressure co-explosion unit; the calcination unit 102 is under slightly positive pressure; the transition isolation silo 6 is under slightly positive pressure with weak buffer; the negative pressure co-explosion unit is under negative pressure; the overall pressure decreases step by step, forming a pressure decreasing gradient from the calcination unit to the transition isolation silo and then to the negative pressure co-explosion unit.

[0081] The outer wall of the cylinder base 201 is wrapped with a heat insulation layer 206. The heat insulation layer 206 is equipped with three independently temperature-controlled infrared heating coils, which are arranged in sequence along the material flow direction as the constant temperature feeding section, the intermediate strengthening section and the discharge maintenance section, and are equipped with a temperature control system.

[0082] The vacuum carrier gas distribution system 7 includes a vacuum extraction system, a carrier gas distribution system, and an optimized airflow organization structure. The vacuum extraction system includes a pump body 701 and a main extraction port 702 that are interconnected. The pump body 701 adopts a two-stage unit structure consisting of a Roots vacuum pump and a water ring vacuum pump. The main extraction port 702 is located in the middle of the top of the cylinder base 201, and a ceramic filter tube is installed at the front end of the main extraction port 702. The carrier gas distribution system includes an annular gas distributor 703 embedded between ceramic liners 203. The annular gas distributor 703 is assembled on the material-facing surface of the ceramic feed plate assembly 3. An inclined micro-hole 704 facing the material curtain is opened on the inner side of the annular gas distributor 703 for spraying out a mixture of hydrogen chloride and nitrogen gas and forming a countercurrent contact with the falling material curtain. The optimized airflow organization structure includes auxiliary extraction ports 705 respectively located at the feed end 204 and the discharge end 205 of the reaction cylinder.

[0083] The working principle of this invention is as follows:

[0084] The ceramic feeding plate assembly 3 adopts a composite structure of arc-shaped guide channel 303 and top turbulent wave teeth 302, arranged in an inclined spiral array. The arc-shaped guide channel 303 flexibly receives and lifts the material, suppressing material slippage and material collapse. Combined with the top turbulent wave teeth 302, it continuously disperses and disturbs the material in layers. During the rotation of the cylinder base 201, the quartz sand is lifted to form a uniform thin material curtain, and the particles are separated from each other, reducing the phenomenon of particle stacking and agglomeration. This allows the quartz sand particles to be fully exposed to the high temperature negative pressure and chlorination atmosphere environment inside the cylinder. The heating and pressure conditions between particles tend to be consistent, effectively improving the uniformity of gas-liquid inclusion bursting and reducing the risk of local under-bursting and over-firing.

[0085] The ceramic lifting plate 301 is equipped with a wedge-shaped pressure relief groove 304 with a narrow opening on the receiving side and an expanded opening on the back side. It relies on the size barrier to prevent the main particles of quartz sand from embedding into the groove. At the same time, the annular gas distributor 703, which is installed on the receiving side of the ceramic lifting plate component 3, forms a purging airflow from the back side to the receiving side by creating negative pressure on the cylinder base 201. This achieves self-cleaning of the groove and prevents particles and fine powder from being stuck and blocked. The wedge-shaped pressure relief groove 304 opens up the airflow channel of the plate, allowing the high-temperature carrier gas of hydrogen chloride and nitrogen to penetrate into the material layer and build a three-dimensional gas-solid contact environment. This not only ensures the stability of the negative pressure difference inside the material layer and avoids insufficient driving force for the bursting of inclusions due to pressure difference decay, but also enhances the efficiency of the gas phase chlorination impurity removal reaction and improves the removal effect of impurities inside submicron inclusions.

[0086] Both the feed end 204 and the discharge end 205 of the reaction cylinder are equipped with independent rotary sealing structures 4 with three-layer sealing cavities. The inner layer uses flexible graphite packing to seal and adapt to high-temperature rotary friction conditions. The middle layer is equipped with a labyrinth tooth structure to extend the gas leakage path. The outer layer nitrogen gas sealing cavity is filled with nitrogen at a pressure higher than the vacuum degree inside the cylinder base 201 to form a reverse gas curtain to prevent outside air from seeping in. The rotary sealing structure 4 at the discharge end 205 of the reaction cylinder is inserted below the liquid surface of the water quenching tank to form a liquid seal, forming a fourth layer of sealing protection. The three-layer sealing structure and the liquid seal at the discharge end 205 of the reaction cylinder work together to further prevent outside air from being drawn back into the negative pressure rotary reaction cylinder 2 through the feed end, significantly reducing the overall dynamic seal leakage rate, suppressing the vacuum degree fluctuation inside the negative pressure rotary reaction cylinder 2, and stabilizing the negative pressure conditions required for the explosion of the gas-liquid inclusions, so as to achieve continuous and reliable operation of the negative pressure rotary reaction cylinder 2 under vacuum conditions during continuous feeding and discharging.

[0087] The rotary locking valve 5 is equipped with a sector-shaped segmented hopper 503. Material is fed from the top of the rotary locking valve 5. When the sensor 506 detects that the sector-shaped segmented hopper 503 is full, it triggers rotation, rotating the sector-shaped segmented hopper 503, which is fully loaded with quartz sand, to the bottom to complete the material unloading and conveying. During the unloading process of the sector-shaped segmented hopper 503, a certain thickness of quartz sand particles will always remain in the valve box 501, thereby continuously building a stable and reliable solid particle material seal. Relying on the solid particle accumulation and blocking effect of this material seal, while realizing the continuous intermittent conveying of quartz sand from the roasting unit 102 to the negative pressure co-explosion unit, it effectively blocks the large-scale crossflow of gas between the two units, greatly reduces the large amount of gas in the roasting unit 102 being sucked by the negative pressure explosion unit, avoids the risk of a large drop in the vacuum degree of the negative pressure rotary reaction cylinder 2, and provides a key guarantee for the negative pressure co-explosion unit to maintain a stable working vacuum.

[0088] The transition isolation silo 6 is equipped with a spiral conveyor plate 602. As the silo 601 rotates synchronously with the coaxial shaft, the spiral conveyor plate 602 can realize the automatic conveying of quartz sand material. The material continuously filled and accumulated between the spiral conveyor plates 602 can form an auxiliary material seal, further hindering the gas flow between the roasting unit 102 and the negative pressure co-explosion unit. Together with the front-end rotary locking valve 5, it can enhance the gas barrier capability and reduce the leakage of harmful gases across units.

[0089] The transition isolation silo 6 works in concert with a nitrogen injector 603, a vacuum relief device 604, and a pressure detector 605. The nitrogen injector 603 introduces nitrogen at a small flow rate to create an intermediate buffer pressure inside the silo 601, diluting the leaked flue gas and water vapor. The vacuum relief device 604 directs the harmful gases inside the silo 601 to the tail gas and waste liquid recycling unit to prevent pressure buildup inside the silo 601. The pressure detector 605 adjusts the nitrogen flow rate and the pressure relief opening in a coordinated manner to stably maintain the gradient pressure relationship between the roasting unit 102, the transition isolation silo 6, and the negative pressure co-explosion unit, reducing the intrusion of water vapor and oxidizing gases into the hydrogen chloride atmosphere, reducing the equipment maintenance load, and ensuring the stable vacuum condition of the negative pressure co-explosion unit.

[0090] Within the negative pressure and high-temperature environment of the rotary reactor 2, inclusions within the quartz sand burst under a stable pressure differential, fully exposing alkali metals, alkaline earth metals, iron, aluminum, and other metallic impurities that were originally sealed within the quartz matrix. The exposed impurities undergo a gas-solid chlorination reaction with hydrogen chloride to generate low-boiling-point metal chlorides. These chlorides readily vaporize under high temperature and negative pressure conditions and are carried out of the rotary reactor 2 by the exhaust gas flow, achieving gas-phase pre-removal of impurities. Simultaneously, trace amounts of hydrogen chloride slightly etch and clear the micro-cracks formed by the bursting inclusions, dissolving the thin layer of residual impurities on the inner walls of the cracks and preventing them from being re-blocked by impurities. This provides a clear path for acid penetration in the subsequent acid leaching process, fully leveraging the synergistic effect of physical bursting and gas-phase chemical impurity removal, improving the pre-removal rate of alkali metal impurities, effectively shortening the subsequent acid leaching treatment time, and reducing acid consumption.

[0091] A pump body 701 of a two-stage vacuum unit consisting of a Roots vacuum pump and a water ring vacuum pump is used. A main extraction port 702 is located at the top middle section of the negative pressure rotary reaction cylinder 2, along with auxiliary extraction ports 705 at the inlet end 204 and outlet end 205 of the reaction cylinder. This creates a flow field within the negative pressure rotary reaction cylinder 2 with a central main extraction, two auxiliary extractions at both ends, and an intake. In conjunction with an annular gas distributor 703, the mixed gas is uniformly sprayed out through inclined micro-holes 704 facing the material curtain, forming a counter-current contact with the falling and dispersed quartz sand material curtain. This promotes uniform distribution of the carrier gas within the cylinder body 201 without dead zones. The vacuum within the negative pressure rotary reaction cylinder 2 is stably maintained, providing a continuous and stable pressure differential driving force for inclusion bursting, thus increasing the inclusion bursting rate. The counter-current contact mode increases the probability of gas-solid contact, allowing trace amounts of hydrogen chloride to fully participate in the chlorination reaction and improving the carrier gas utilization efficiency.

[0092] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for removing gas-liquid inclusions in quartz sand, comprising a feeding pretreatment unit (101), a segmented gradient heating roasting unit (102), a negative pressure synergistic bursting unit, a water quenching prewashing unit (103), an ultrasonically enhanced countercurrent acid leaching unit (104), and a drying and discharging unit (105) arranged in series along the material flow direction. Its features are: A rotary locking and sealing connection mechanism is provided between the roasting unit (102) and the negative pressure co-explosion unit; The negative pressure synergistic bursting unit adopts a horizontal continuous rotary structure, including a sealed negative pressure rotary reaction cylinder (2), a rotary sealing structure (4), and a vacuum carrier gas synergistic distribution system (7). The cylinder body (201) of the negative pressure rotary reaction cylinder (2) is made of stainless steel, and the inner wall is provided with a double-layer composite lining. The double-layer composite lining includes a bottom corrosion-resistant layer (202) and a top ceramic lining plate (203). The negative pressure rotary reaction cylinder (2) is installed at an angle. The inner wall of the negative pressure rotary reaction cylinder (2) is equipped with a ceramic lifting plate assembly (3), which continuously lifts the material to form a uniform material curtain during rotation; The ceramic feeding plate assembly (3) includes ceramic feeding plates (301) that are uniformly fixed along the inner wall of the ceramic liner (203) and are arranged in a spiral array at an incline. The rotary sealing structure (4) is respectively installed at the feed end (204) and discharge end (205) of the negative pressure rotary reactor (2). The rotary locking and sealing connection mechanism includes a rotary locking valve (5) and a transition isolation hopper (6). The rotary locking valve (5) includes a valve box (501), an electric rotating shaft (502) is assembled in the middle of the valve box (501), and a fan-shaped compartment hopper (503) adapted to the valve box (501) is uniformly fixed to the electric rotating shaft (502) in the circumferential direction. The valve box (501) has a valve box feed end (504) on the upper part and a valve box discharge end (505) on the lower side of the valve box (501). Both the valve box feed end (504) and the valve box discharge end (505) are adapted to the fan-shaped compartment hopper (503).

2. The device for removing gas-liquid inclusions in quartz sand according to claim 1, characterized in that: The ceramic lifting plate (301) has staggered and interlaced wave teeth (302) at its ends; the ceramic lifting plate (301) has an arc-shaped guide groove (303) facing the material lifting direction; and the surface of the ceramic lifting plate (301) has a through wedge-shaped pressure relief groove (304). The wedge-shaped pressure relief groove (304) is flared wedge-shaped from the material receiving side to the material back side.

3. The device for removing gas-liquid inclusions in quartz sand according to claim 1, characterized in that: The rotary sealing structure (4) consists of, from the inside out, an inner layer of flexible graphite packing seal, a middle layer of labyrinth tooth structure, and an outer layer of nitrogen gas sealing cavity. The flexible graphite packing seal is adapted to high-temperature rotary friction conditions. The labyrinth tooth structure is used to extend the gas leakage path; The nitrogen gas sealing cavity is used to introduce nitrogen gas to form a reverse air curtain to prevent outside air from seeping in. The rotary sealing structure (4) of the discharge end (205) of the reaction cylinder is inserted below the liquid surface of the water quenching tank of the water quenching pre-washing unit (103) to form a liquid seal as a sealing guarantee; The rotary sealing structure (4) of the feed end (204) of the reaction cylinder is connected to the rotary locking sealing connection mechanism.

4. The device for removing gas-liquid inclusions in quartz sand according to claim 3, characterized in that: The valve box feed end (504) is equipped with a sensor (506) that controls the electric rotating shaft (502). The valve box discharge end (505) is connected to the expansion pipe (507); The sensor (506) senses that the fan-shaped compartment hopper (503) is full and triggers the electric shaft (502) to rotate, rotating the fan-shaped compartment hopper (503) full of quartz sand to the bottom for unloading. Quartz sand is always left in the fan-shaped compartment hopper (503) to form a solid particle material seal. The valve box feed end (504) is connected to the roasting unit (102).

5. The device for removing gas-liquid inclusions in quartz sand according to claim 4, characterized in that: The transition isolation hopper (6) is located downstream of the rotary locking valve (5) and includes a hopper cylinder (601), inside which a spiral conveyor plate (602) is provided. The discharge end of the silo (601) is connected to the feed end (204) of the reaction cylinder through a rotary sealing structure (4), and the feed end of the silo (601) and the expansion pipe (507) are rotatably connected. When the transition isolation silo (6) rotates synchronously with the negative pressure rotary reactor (2) on the same axis, it conveys materials through the spiral conveyor plate (602), and the materials between the spiral conveyor plates (602) form an auxiliary material seal.

6. The device for removing gas-liquid inclusions in quartz sand according to claim 5, characterized in that: The silo (601) is equipped with a nitrogen injector (603), an air extraction and pressure relief device (604), and a pressure detector (605) on its wall. The nitrogen injector (603) is located on the upper part of the silo (601) and is biased towards the roasting unit (102); the nitrogen injector (603) discharges gas through one end of the spiral conveyor plate (602) to introduce inert gas into the silo (601) to build an intermediate buffer pressure; The exhaust pressure relief device (604) is located at the lower part of the silo (601); the exhaust pressure relief device (604) draws in gas through the other end of the spiral conveyor plate (602) to discharge the roasting flue gas and mixed gas that have entered the silo (601); The pressure detector (605) is located outside the silo (601) and biased towards the negative pressure co-bursting unit. The pressure detector (605) is used to collect the pressure inside the silo (601) in real time and adjust the nitrogen injector (603) and the vacuum relief device (604) in conjunction to stably maintain the gradient pressure relationship between the calcination unit (102), the transition isolation silo (6) and the negative pressure co-bursting unit.

7. The device for removing gas-liquid inclusions in quartz sand according to claim 1, characterized in that: The outer wall of the cylindrical base (201) is wrapped with a heat insulation layer (206). The heat insulation layer (206) is provided with three independently temperature-controlled infrared heating coils, which are the feeding constant temperature section, the middle strengthening section and the discharge maintenance section in sequence along the material flow direction.

8. The device for removing gas-liquid inclusions in quartz sand according to claim 1, characterized in that: The vacuum carrier gas cooperative distribution system (7) includes a vacuum extraction system, a carrier gas distribution system, and an optimized airflow organization structure; The vacuum extraction system includes a pump body (701) and a main extraction port (702) that are interconnected. The pump body (701) adopts a two-stage unit structure consisting of a Roots vacuum pump and a water ring vacuum pump; The main exhaust port (702) is located in the middle section of the top of the cylinder base (201), and a ceramic filter tube is installed at the front end of the main exhaust port (702); The carrier gas distribution system includes an annular gas distributor (703) embedded between ceramic liners (203), the annular gas distributor (703) being assembled on the material-facing surface of the ceramic feeder assembly (3); The annular gas distributor (703) has inclined micro-holes (704) on its inner side facing the material curtain direction, which are used to spray out a mixture of hydrogen chloride and nitrogen gas and form a countercurrent contact with the falling material curtain. The optimized airflow organization structure includes auxiliary air extraction ports (705) respectively located at the feed end (204) and discharge end (205) of the reaction cylinder.

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