Vacuum chlorination roasting gas inlet purification system for high-purity quartz sand

Abstract

This invention discloses a high-purity quartz sand vacuum chlorination roasting gas purification system, comprising: a support platform, which includes a graphite platform and graphite support columns, with several sets of graphite support columns; a gas distribution plate, fixed to the top surface of the graphite platform, with several placement areas on the gas distribution plate, each placement area equipped with a gas distribution module; a purification device, with several sets of purification devices, each set fixed within a placement area on the gas distribution plate, the purification device including a device body and a device cover, the device cover being detachably connected to the top of the device body, a vent pipe installed at the center of the device body, the top of the vent pipe being sealed, and an air inlet opening on the vent pipe, the device body being filled with quartz sand; and a gas supply system, connected to the gas distribution modules. This invention allows process gases such as HCl or Cl2 to be forcibly introduced into the interior of the quartz sand to react with impurities, thereby improving the purity of the quartz sand.

Description

Technical Field

[0001] This invention relates to the field of quartz sand intake purification technology, and in particular to a vacuum chlorination roasting intake purification system for high-purity quartz sand. Background Technology

[0002] High-purity quartz sand is characterized by its high purity and quality. Quartz products made from it possess excellent physicochemical properties such as high temperature resistance, corrosion resistance, low thermal expansion, high insulation, and light transmittance. It is widely used in photovoltaics, electronics, high-end electric light sources, thin-film materials, and defense technology, making it an irreplaceable raw material in high-end manufacturing industries. Currently, the highest purity that can be mass-produced is 99.999% (5N) and above, but only a limited number of countries globally can mass-produce 5N-level quartz sand. The mainstream high-purity quartz sand purification technologies include vacuum chlorination roasting, high-temperature and high-pressure methods, and ultrasonic purification.

[0003] Currently, during vacuum chlorination roasting, when HCl or Cl2 reacts with impurities in quartz sand, these two process gases cannot penetrate into the interior of the quartz sand and remain only on the surface to react with the impurities, resulting in low purity of the quartz sand after chlorination roasting. To address this technical problem, this invention provides a high-purity quartz sand vacuum chlorination roasting inlet gas purification system. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum chlorination roasting gas purification system for high-purity quartz sand to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a high-purity quartz sand vacuum chlorination roasting inlet gas purification system, comprising:

[0006] A support platform, comprising a graphite platform and graphite support columns, wherein several groups of graphite support columns are provided, and the several groups of graphite support columns are respectively fixed to the bottom of the graphite platform.

[0007] The gas distribution plate is fixed on the top surface of the graphite platform. The gas distribution plate is provided with several placement areas, and each placement area is provided with a gas distribution module.

[0008] A purification device is provided, comprising several sets of purification devices, each set of which is fixed within a placement area on a gas distribution plate. Each purification device includes a device body and a device cover. The device cover is detachably connected to the top of the device body. A vent pipe is installed at the center of the device body, with a sealed top and its bottom passing through the bottom of the device body and communicating with the gas distribution module. An air inlet is provided on the vent pipe. The device body is filled with quartz sand. A vent hole is provided on the device cover, and the vent hole communicates with the device body.

[0009] A gas supply system, which is connected to the gas distribution module.

[0010] According to the high-purity quartz sand vacuum chlorination roasting gas purification system provided by the present invention, the top of the device body is provided with several sets of concave teeth, and the device cover is fixed with convex teeth, which are engaged with the concave teeth.

[0011] The high-purity quartz sand vacuum chlorination roasting air purification system provided by the present invention has eight protruding teeth.

[0012] According to the high-purity quartz sand vacuum chlorination roasting gas purification system provided by the present invention, the gas distribution module includes a gas inlet source point and a gas inlet. The gas inlet is provided in four groups, which are arranged in a square. The gas inlet source point is located in the middle of the four groups of gas inlets, and the gas inlet and the gas inlet are connected through a branch gas channel. The gas inlet is connected to the bottom of the ventilation pipe, and the gas supply system is connected to the gas inlet source point.

[0013] According to the high-purity quartz sand vacuum chlorination roasting gas purification system provided by the present invention, the gas supply system includes a gas cylinder, a gas pump, a distributor, and gas supply pipes. The gas pump is connected to the gas cylinder, the distributor is connected to the output end of the gas pump, and a plurality of gas supply pipes are installed on the distributor. The plurality of gas supply pipes are respectively connected to the gas inlet point of the gas distribution module.

[0014] According to the high-purity quartz sand vacuum chlorination roasting air purification system provided by the present invention, the air inlet is an oblique hole, and the height of the side near the outer wall of the air pipe is less than the height of the side near the inner wall of the air pipe, so as to avoid sand leakage.

[0015] According to the high-purity quartz sand vacuum chlorination roasting gas purification system provided by the present invention, three sets of graphite support columns are provided at the bottom of the graphite platform.

[0016] The high-purity quartz sand vacuum chlorination roasting air purification system provided by the present invention has 18-24 air inlets.

[0017] The present invention discloses the following technical effects:

[0018] The support platform of this invention is made of graphite, which is resistant to high temperature and corrosion by chlorine gas, and is suitable for high-temperature and corrosive environments. Multiple sets of graphite support columns are distributed and fixed to evenly distribute the weight of the equipment above, avoiding vibration or displacement caused by uneven force, and providing reliable basic support for the long-term stable operation of the system.

[0019] This invention features a gas distribution plate with multiple gas-distributing modules, enabling proportional distribution of gas to each purification unit. The gas inlet is located at the bottom of the gas inlet pipe, and the side wall has openings to allow the gas to permeate the quartz sand evenly, increasing the reaction contact area. Multiple units operate synchronously, and the gas inlet parameters can be independently controlled, improving batch processing efficiency and product purity consistency.

[0020] The cover and body of the device are detachable, which facilitates the loading and unloading of quartz sand and reduces residue; each set of devices is independently fixed, and a single set can be disassembled and repaired separately if it fails, without the need to shut down the entire line; the structure of the vent pipe makes it easy to clean blockages, reduces downtime, and ensures production continuity and maintenance flexibility.

[0021] The sealing structure of each component of this invention is adapted to vacuum conditions, preventing gas leakage and air infiltration, and ensuring a stable vacuum environment. The gas supply system is directly connected to the gas distribution module, which can adjust the gas intake parameters in real time. Combined with the independent operation of multiple sets of devices, it improves process controllability and accurately matches the vacuum chlorination roasting requirements. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an isometric view of the overall structure of the high-purity quartz sand vacuum chlorination roasting air purification system of the present invention;

[0024] Figure 2 This is a top view of the overall structure of the high-purity quartz sand vacuum chlorination roasting air purification system of the present invention;

[0025] Figure 3 This is a bottom view of the graphite platform of the present invention;

[0026] Figure 4 This is a front view of the overall structure of the high-purity quartz sand vacuum chlorination roasting air purification system of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the cover of the device of the present invention;

[0028] Figure 6 This is an isometric view of the cover of the device of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the purification device of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the air distribution plate of the present invention;

[0031] Figure 9 This is a schematic diagram of the gas distribution module of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the device body of the present invention;

[0033] Figure 11 This is a schematic diagram illustrating the fit between the convex and concave teeth of the present invention.

[0034] The components are: 1. Graphite platform; 2. Graphite support column; 3. Gas distribution plate; 4. Placement area; 5. Device body; 6. Device cover; 7. Vent pipe; 8. Air inlet; 9. Concave tooth; 10. Convex tooth; 11. Air source point; 12. Air inlet; 13. Branch air passage; 14. Air supply pipe; 15. Vent. Detailed Implementation

[0035] 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.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figures 1-11 This invention provides a high-purity quartz sand vacuum chlorination roasting inlet gas purification system, comprising:

[0038] The support platform includes a graphite platform 1 and graphite support columns 2. Several sets of graphite support columns 2 are provided, and the several sets of graphite support columns 2 are respectively fixed to the bottom of the graphite platform.

[0039] Gas distribution plate 3 is fixed on the top surface of graphite platform 1. Gas distribution plate 3 is provided with several placement sections 4, and each placement section 4 is provided with a gas distribution module.

[0040] The purification device consists of several sets, each set of purification devices is fixed in a placement area 4 on the gas distribution plate 3. The purification device includes a device body 5 and a device cover 6. The device cover 6 is detachably connected to the top of the device body 5. A vent pipe 7 is installed in the center of the device body 5. The top of the vent pipe 7 is sealed, and the bottom passes through the bottom of the device body 5 and is connected to the gas distribution module. An air inlet 8 is provided on the vent pipe 7. The device body 5 is filled with quartz sand. A vent hole 15 is provided on the device cover 6 and is connected to the device body 5.

[0041] The gas supply system is connected to the gas distribution module.

[0042] Further optimization of the scheme: the top of the device body 5 is provided with several sets of concave teeth 9, and the device cover 6 is fixed with convex teeth 10, which are engaged with the concave teeth 9.

[0043] The design was further optimized, and the number of protruding teeth 10 was increased to 8.

[0044] The scheme is further optimized. The air distribution module includes an air source point 11 and an air inlet 12. There are four sets of air inlets 12 arranged in a square. The air source point 11 is located in the middle of the four sets of air inlets 12. The air inlets 12 and the air source point 11 are connected through a branch air passage 13. The air inlets 12 are connected to the bottom of the ventilation pipe 7. The air supply system is connected to the air source point 11.

[0045] Further optimization of the scheme: the gas supply system includes a gas cylinder, a gas pump, a distributor, and gas supply pipes 14. The gas pump is connected to the gas cylinder, the distributor is connected to the output end of the gas pump, and several sets of gas supply pipes 14 are installed on the distributor. The several sets of gas supply pipes 14 are respectively connected to the air inlet point 11 of the gas distribution module.

[0046] The design was further optimized by making the air inlet 8 an angled hole, with the height of the side near the outer wall of the vent pipe 7 being less than the height of the side near the inner wall of the vent pipe 7 to prevent sand leakage. To further enhance protection, a plug can be installed at the inlet of the angled hole. The plug has a cross-shaped groove and is opened by air pressure to allow air intake; under normal conditions, it remains closed.

[0047] To further optimize the design, three sets of graphite support columns 2 are installed at the bottom of the graphite platform 1.

[0048] The design was further optimized so that the number of air intake holes 8 was 18-24.

[0049] First, design the initial height of the highest inclined air inlet 8 of the vent pipe 7 and complete its installation;

[0050] Calculate the initial height: The initial height of the air inlet 8 at the highest point of the vent pipe 7 of the device is pre-designed. The calculation formula is "initial height = (loose filling height + compaction height) / 2 when the device body 5 is filled with quartz sand", where the loose filling height refers to the height of the device body 5 when the quartz sand is naturally filled, and the compaction height refers to the height of the quartz sand after compaction.

[0051] Complete the installation of the ventilation pipe 7: Install the ventilation pipe 7 onto the device body 5, and axially position it by means of the stepped shaft at the bottom of the ventilation pipe 7 and the through hole at the bottom of the device body 5 to ensure that the ventilation pipe 7 is fixed and stable.

[0052] Second, load and assemble the purification device;

[0053] Fill with quartz sand: Select natural quartz sand with a density of 2.65 g / cm³. 3 Quartz sand with a particle size of 40-140 mesh was filled into the interior of the device body 5, and the height of the quartz sand was measured and recorded at the same time.

[0054] Fixing device cover 6: Align the 8 protruding teeth 10 on the device cover 6 with the 8 concave teeth 9 on the top of the device body 5, and rotate the device cover 6 to make the protruding teeth 10 engage in the grooves of the concave teeth 9, thereby fixing the device cover 6 axially to prevent the quartz sand from being contaminated and to prevent the airflow from pushing the device cover 6 open during subsequent ventilation.

[0055] Third, place it in the roasting furnace and perform vacuum heating operation;

[0056] Placement device: Place the assembled quartz sand purification device into the vacuum chlorination roasting furnace.

[0057] Vacuuming and heating: Close the furnace door, start the equipment to evacuate the furnace, and at the same time start the heating program to gradually bring the furnace to the set purification temperature.

[0058] Fourth, introduce process gas and carry out charging and pumping cycles;

[0059] Gas introduction: When the furnace temperature reaches the specified value, introduce HCl or CL2 gas into the furnace, control the gas inlet pressure to 0.3 MPa, and keep the pressure inside the vacuum chlorination roasting furnace stable at 1 Pa.

[0060] Perform the filling and evacuation cycle: Start the filling and evacuation cycle program and continuously perform filling and evacuation operations. The entire cycle lasts for 10 hours. During this process, the gaps between the quartz sands will gradually decrease under the action of gas pressure, the filling height will decrease, and the loose density will tend to the compacted density.

[0061] 5. Cool down and remove from the furnace, then measure the actual height of the quartz sand.

[0062] Cooling process: After completing 10 hours of charging and pumping cycles, stop the heating process and allow the furnace to cool down naturally.

[0063] Remove the device and measure: After the temperature inside the furnace drops to a suitable level, open the furnace door and remove the purification device. Remove the device cover 6 and measure and record the actual height of the upper surface of the purified quartz sand.

[0064] Sixth, determine the rationality of the design based on the height comparison results and make adjustments accordingly;

[0065] Result judgment: The actual height of the measured quartz sand is compared with the initial height (the initial height of the highest inclined air inlet 8 on the side of the vent pipe 7 of the device).

[0066] Design Adjustment: If "actual height > initial height", it means that the design of the highest inclined air inlet 8 of the vent pipe 7 is reasonable and can ensure that HCl or CL2 enters the quartz sand through the inclined air inlet 8 of the vent pipe 7 and reacts with impurities; if "actual height < initial height", the initial height design of the highest inclined air inlet 8 of the vent pipe 7 needs to be modified. Then repeat the above steps one to five until the final measured actual height of the quartz sand is greater than the initial height to ensure that the design meets the requirements.

[0067] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0068] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-purity quartz sand vacuum chlorination roasting inlet gas purification system, characterized in that, include: The support platform includes a graphite platform (1) and graphite support columns (2). Several sets of graphite support columns (2) are provided, and several sets of graphite support columns (2) are respectively fixed to the bottom of the graphite platform (1). Gas distribution plate (3), the gas distribution plate (3) is fixed on the top surface of the graphite platform (1), and the gas distribution plate (3) is provided with a number of placement intervals (4), and each placement interval (4) is provided with a gas distribution module; A purification device is provided, and the purification device is provided in several groups. The several groups of purification devices are respectively fixed in the placement area (4) on the gas distribution plate (3). The purification device includes a device body (5) and a device cover (6). The device cover (6) is detachably connected to the top of the device body (5). A ventilation pipe (7) is installed in the center of the device body (5). The top of the ventilation pipe (7) is sealed, and the bottom passes through the bottom of the device body (5) and communicates with the gas distribution module. An air inlet (8) is opened on the ventilation pipe (7). The device body (5) is filled with quartz sand. A ventilation hole (15) is opened on the device cover (6). The ventilation hole (15) communicates with the device body (5). A gas supply system, wherein the gas supply system is connected to the gas distribution module; The gas distribution module includes an air intake point (11) and an air inlet (12). There are four sets of air inlets (12), which are arranged in a square. The air intake point (11) is located in the middle of the four sets of air inlets (12), and the air inlet (12) and the air intake point (11) are connected by a branch air passage (13). The air inlet (12) is connected to the bottom of the ventilation pipe (7), and the gas supply system is connected to the air intake point (11). The gas supply system includes a gas cylinder, a gas pump, a distributor and a gas supply pipe (14). The gas pump is connected to the gas cylinder, the distributor is connected to the output end of the gas pump, and a number of gas supply pipes (14) are installed on the distributor. The number of gas supply pipes (14) are respectively connected to the air inlet (11) of the gas distribution module. The air inlet (8) is an oblique hole, and the height of the side near the outer wall of the air pipe (7) is less than the height of the side near the inner wall of the air pipe (7) to avoid sand leakage.

2. The high-purity quartz sand vacuum chlorination roasting inlet gas purification system according to claim 1, characterized in that, The top of the device body (5) is provided with several sets of concave teeth (9), and the device cover (6) is fixed with convex teeth (10), which are engaged with the concave teeth (9).

3. The high-purity quartz sand vacuum chlorination roasting inlet gas purification system according to claim 2, characterized in that, The number of the protruding teeth (10) is 8.

4. The high-purity quartz sand vacuum chlorination roasting inlet gas purification system according to claim 1, characterized in that, The graphite support columns (2) are arranged in three sets at the bottom of the graphite platform (1).

5. The high-purity quartz sand vacuum chlorination roasting inlet gas purification system according to claim 1, characterized in that, The number of air inlets (8) is 18-24.

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