Device and method for purifying quartz sand through high-temperature chlorination

Abstract

The invention relates to a device and a method for purifying quartz sand through high-temperature chlorination, and aims to improve the purification efficiency, the equipment durability and the process environmental protection property of the quartz sand, the device adopts a plasma heating ring and a plurality of plasma nozzles penetrating through a heating section, so that the quartz sand can be rapidly and uniformly heated, and the quality of the quartz sand is improved. The suspension state of the quartz sand in the conveying and heating process is kept through the air floating pipe system, particle adhesion is avoided, uniform heating is ensured, temperature and resistance sensors in the device monitor and adjust operation parameters in real time through a controller, temperature stability and equipment corrosion resistance in the process are ensured, the operation safety and stability are effectively improved, and the production efficiency is improved. The inner wall of the device is coated with an aluminum oxide ceramic coating, an electrochemical protection system is arranged, double protection is provided, the service life of equipment is prolonged, the structural design of the reaction section and the reasonable arrangement of a chlorine gas supply system ensure efficient removal of impurities, and the purification effect is further improved.

Description

Technical Field

[0001] The present invention relates to a device and a method for purifying quartz sand by high-temperature chlorination, and in particular to a device and a method for purifying quartz sand by high-temperature chlorination applied in the technical field of quartz sand purification. Background Art

[0002] Quartz sand is an important raw material for glass, ceramics, semiconductors and other industries. Its purity directly affects the quality of the products. In the process of quartz sand purification, chlorination is a commonly used and efficient purification method, which removes impurities by reacting with chlorine under high temperature conditions. However, the existing purification equipment still has some technical bottlenecks in practical applications, which limits production efficiency and the quality of the final product.

[0003] Chinese invention patent CN116621187B discloses a device for high-temperature chlorination purification of quartz sand, which adopts components such as a one-way water filtration mechanism, an adaptive mortar feeding joint, a heating mechanism and a vacuum dehydration mechanism. The device has certain advantages in improving the efficiency of chlorination purification, especially in the material selection of the microporous filter plate, a titanium alloy with higher strength is used, which improves the filtration accuracy, and optimizes the water removal process through a breathing-type alternating suction and drainage scheme. However, the device still has the following limitations: although the filter plate has high strength, in a high-temperature chlorination environment, the titanium alloy material may react with chlorine gas by side reactions, resulting in a shortened equipment life and a reduced purification effect. In addition, the vacuum dehydration mechanism of the device is complex, which can easily lead to inconvenience in operation and high maintenance costs.

[0004] Chinese invention patent CN117142754B discloses a quartz tube quartz sand high-temperature chlorination purification furnace. The angle adjustment of the quartz glass tube is achieved through components such as a fixed frame, a support plate, and an incomplete gear. The quartz glass tube is driven to reciprocate through a rotating component, thereby improving the uniformity and efficiency of the purification process. Although the equipment has improvements in operational convenience and purification effect, it relies on a mechanical transmission system for angle and rotation adjustment, which increases the complexity and failure rate of the equipment. In addition, the quartz glass tube is prone to stress concentration in a high temperature environment, resulting in cracks or breakage, which affects the service life of the equipment. Summary of the invention

[0005] In view of the deficiencies in the above-mentioned prior art, the present invention aims to solve the following technical problems: how to achieve uniform heating of quartz sand and efficient impurity removal during high-temperature chlorination purification, while avoiding equipment corrosion caused by the reaction of the material with chlorine.

[0006] In order to solve the above problems, the present invention provides a device and method for purifying quartz sand by high-temperature chlorination, comprising a controller and a feeding section, wherein the top of the feeding section is fixedly connected with a heating section, an outer wall of the heating section close to one end of the feeding section is fixedly connected with a plasma heating ring, the plasma heating ring is a hollow ring-shaped structure, and the hollow part is connected to an external high-pressure gas source through a pipeline, a plurality of plasma nozzles are fixedly connected to one end of the plasma heating ring close to the heating section, and each plasma nozzle is fixedly connected with an electrode, and the plurality of electrodes are electrically connected to the controller, a reaction section is fixedly connected to the top of the heating section, the reaction section is a conical structure, and the end with a larger diameter of the conical structure is arranged away from the heating section, a discharge section is fixedly connected to the top of the reaction section, and the outer end of the discharge section is fixedly connected to A discharge pipe is connected, an air intake ring is fixedly connected to one end of the outer wall of the reaction section near the heating section, a plurality of reaction nozzles perpendicular to the outer wall of the reaction section are fixedly connected to one end of the air intake ring near the reaction section, and the plurality of reaction nozzles all penetrate the reaction section and extend to the inner wall of the reaction section, the air intake ring is a hollow ring structure, and the hollow part is connected to an external chlorine gas supply system through a pipeline, and the plurality of reaction nozzles are all connected to the hollow part of the air intake ring, a plurality of chemical electrodes are fixedly connected to the inner walls of the heating section, the reaction section and the discharge section, and the plurality of chemical electrodes are all made of zinc, the heating section, the reaction section and the discharge section are all made of iron, the inner walls of the heating section, the reaction section, the discharge section and the chemical electrode are all coated with an alumina ceramic coating, and the heating section, the reaction section, the discharge section and the chemical electrode are all electrically connected to the controller.

[0007] In the above-mentioned device and method for high-temperature chlorination purification of quartz sand, a plasma heating ring and a plurality of plasma nozzles penetrating the heating section are used to achieve rapid and uniform heating of the quartz sand. At the same time, an air flotation tube system is used to keep the quartz sand suspended during the transmission and heating process to ensure uniform heating of the particles and avoid adhesion. The temperature and resistance sensors in the device monitor and adjust the operating parameters in real time through the controller to ensure temperature stability and equipment corrosion protection during the purification process. The inner wall of the device is coated with an alumina ceramic coating and is equipped with an electrochemical protection system to provide double protection and extend the service life of the equipment.

[0008] As a further improvement of the present application, multiple plasma nozzles near one end of the heating section all penetrate the heating section and extend to the inner wall of the heating section. Multiple plasma nozzles are all conical structures, and the end with a larger diameter of the conical structure is fixedly connected to the plasma heating ring.

[0009] As a further improvement of the present application, a partition is fixedly connected to the bottom end of the feed section, a motor is fixedly connected to the bottom end of the partition, the motor is electrically connected to the controller, a power shaft of the motor passes through the partition, and a screw is fixedly connected to the passing part, and a base is fixedly connected to the outer end of the reaction section.

[0010] As a further improvement of the present application, the outer wall of the screw is slidably connected to the inner wall of the feed section, the top of the screw is flush with the top of the feed section, and the discharge pipe is arranged to be tilted downward away from one end of the discharge section.

[0011] As another improvement of the present application, the outer wall of the feed section is fixedly connected with a symmetrically arranged flotation tube and a feed pipe, the flotation tube is connected to an external high-pressure inert gas source, and a porous baffle is fixedly connected to one end of the flotation tube near the feed section, and the diameter of the baffle through hole is smaller than the diameter of the quartz sand.

[0012] As another improved supplement of the present application, one end of the feed pipe away from the feed section is fixedly connected to a partition plate 2, and one end of the partition plate 2 away from the feed pipe is fixedly connected to a motor 2, which is electrically connected to the controller, and a power shaft of the motor 2 passes through the partition plate 2, and a screw 2 is fixedly connected to the passing part.

[0013] As another improved supplement of the present application, the outer wall of screw 2 is slidably connected to the inner wall of the feed pipe, and the end of screw 2 close to the feed section is three to five centimeters away from the feed section. Multiple temperature sensors are fixedly connected in the feed section, heating section, reaction section and discharge section.

[0014] As another improvement of the present application, a feed hopper is fixedly connected to the upper end of the outer wall of the feed pipe away from one end of the feed section, and an exhaust port is fixedly connected to the top of the discharge section.

[0015] A device and method for high-temperature chlorination purification of quartz sand, comprising the following steps:

[0016] S1: Put the quartz sand to be purified into the feed hopper, start the motor 2 through the controller to drive the screw 2 to rotate, and gradually push the quartz sand from the feed hopper into the feed section, and start entering the purification device;

[0017] S2: Start the motor to drive the screw to rotate. The screw pushes the quartz sand upward along the feeding section during the rotation. At the same time, high-pressure inert gas (such as argon or nitrogen) is introduced into the feeding section and the heating section through the air flotation tube. When the inert gas flows through the feeding section and the heating section, it blows the quartz sand particles to suspend them, thereby avoiding adhesion and accumulation between the particles and ensuring uniform heating;

[0018] S3: The plasma heating system is started by the controller, and the electrodes in the multiple plasma nozzles are discharged under the action of high-pressure gas (such as argon gas) to generate a high-temperature plasma flow. The plasma flow is ejected into the heating section through the plasma nozzle to uniformly heat the quartz sand particles in the suspended state, and the temperature of the quartz sand is quickly raised to the high temperature state required for the chlorination reaction;

[0019] S4: When the quartz sand is heated to the required temperature, the quartz sand enters the reaction section under the action of air flotation and the push of screw 1. At this time, the chlorine gas supply system is started through the air inlet ring, and multiple reaction nozzles evenly inject chlorine into the reaction section. The chlorine reacts chemically with the high-temperature quartz sand to remove impurities such as iron and aluminum in the quartz sand and generate volatile chlorides (such as ferric chloride);

[0020] S5: During the chlorination reaction, the inner walls of the heating section, reaction section and discharge section and the chemical electrode are coated with alumina ceramic coating to prevent chlorine and its reaction products from corroding the equipment and electrodes. When the alumina ceramic coating is damaged due to high temperature or chemical reaction, the controller automatically activates the electrochemical protection system to protect the heating section, reaction section, discharge section and chemical electrode through external current to further prevent corrosion.

[0021] S6: During the entire purification process, the controller monitors the resistance changes of the heating section, reaction section, discharge section and chemical electrode in real time to detect corrosion. When signs of corrosion are detected, the controller adjusts the impressed current or other protective measures to ensure the integrity and long-term stability of the equipment and electrodes;

[0022] S7: The ferric chloride generated after the chlorination reaction further reacts with the heating section, reaction section, discharge section and chemical electrode to generate ferrous chloride and zinc chloride. Zinc chloride forms a protective film on the inner wall of the equipment, acting as a sacrificial anode to protect the base metal from further corrosion. At the same time, ferrous chloride slows down the corrosion rate of iron to a certain extent, ensuring the service life of the equipment.

[0023] S8: The purified quartz sand is discharged through the discharge section, and the gas and volatile chloride generated during the purification process are discharged through the exhaust port. The gas is further processed to meet environmental protection requirements.

[0024] In summary, this application has the following beneficial effects:

[0025] 1. Efficient quartz sand purification process and uniform heating. By adopting a plasma heating ring and multiple plasma nozzles that penetrate the heating section, the device can achieve rapid and uniform heating of quartz sand. The design of the conical plasma nozzle enables the high-temperature plasma flow to be more concentratedly sprayed to the inner area of ​​the heating section, ensuring that the quartz sand particles are fully heated in a suspended state, significantly improving the heating rate, ensuring the high temperature conditions required for the chlorination reaction, and thus improving the purification efficiency. At the same time, the flotation tubes in the feeding section and the heating section allow the quartz sand to remain in a suspended state during the transmission and heating process through the introduction of high-pressure inert gas, avoiding particle adhesion and accumulation, and further ensuring uniform heating during the purification process.

[0026] 2. Accurate temperature and corrosion monitoring improves operational safety. Multiple temperature sensors and resistance sensors in the device monitor the temperature and resistance changes of the heating section, reaction section, discharge section and chemical electrode in real time through the controller. The controller can quickly adjust the operating parameters according to the feedback data to ensure that the temperature of the entire purification process is stable within the optimal range. At the same time, it can detect and respond to the corrosion of the equipment in a timely manner to prevent equipment damage. Such a monitoring and adjustment mechanism greatly improves the safety and stability of the purification process, ensures the safe operation of the equipment in a high temperature and high pressure environment, and reduces the need for manual intervention.

[0027] 3. Enhanced equipment anti-corrosion ability and extended equipment service life. The inner walls of the heating section, reaction section, discharge section and chemical electrode are coated with alumina ceramic coating, which provides excellent anti-corrosion protection. When the alumina ceramic coating is damaged by high temperature or chemical reaction, the controller will automatically activate the electrochemical protection system to further protect these key components through external current to prevent corrosion. This dual protection design significantly extends the service life of the equipment and reduces maintenance requirements and related costs.

[0028] 4. Efficient impurity removal and automatic control, the conical structure design of the reaction section, and the reasonable arrangement of the air inlet ring and the reaction nozzle ensure that the chlorine gas is fully in contact with the quartz sand under high temperature conditions, and quickly reacts chemically with the impurities such as iron and aluminum therein to generate volatile chlorides. These volatile chlorides are discharged from the device through the discharge section and the discharge pipe, which reduces the residual impurities in the quartz sand and improves the purification effect. In addition, the controller automatically adjusts the operating parameters according to the real-time data feedback from the sensor to ensure the efficiency and safety of the purification process, reduce the risk of equipment damage, and improve the reliability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the overall structure diagram of this application;

[0030] Figure 2 This is an overall exploded view of this application;

[0031] Figure 3 Partial explosion for this application Figure 1 ;

[0032] Figure 4 Partial explosion for this application Figure 2 ;

[0033] Figure 5 Partial explosion for this application Figure 3 ;

[0034] Figure 6 This is the front view of the application;

[0035] Figure 7For this application Figure 6 Middle AA section view;

[0036] Figure 8 For this application Figure 7 Middle BB section view;

[0037] Fig. 9 For this application Figure 7 Middle CC section view;

[0038] Fig.10 This is the appearance structure diagram of this application.

[0039] Description of the numbers in the figure:

[0040] 1. Feeding section; 2. Heating section; 3. Plasma heating ring; 4. Reaction section; 5. Discharge section; 6. Discharge pipe; 7. Inlet ring; 8. Chemical electrode; 9. Plasma nozzle; 10. Reaction nozzle; 11. Partition one; 12. Motor one; 13. Screw one; 14. Flotation tube; 15. Feeding pipe; 16. Motor two; 17. Screw two; 18. Feed hopper. DETAILED DESCRIPTION

[0041] Three embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] like Figures 1 to 10 As shown, this embodiment provides a device and method for high-temperature chlorination purification of quartz sand, the device includes a feed section 1, a heating section 2, a plasma heating ring 3, a reaction section 4, a discharge section 5, a discharge pipe 6, an air intake ring 7, a reaction nozzle 10, a chemical electrode 8 and a controller.

[0044] A heating section 2 is fixedly connected to the top of the feed section 1. The feed section 1 is used to accommodate and transport quartz sand to be purified. A plasma heating ring 3 is fixedly connected to the outer wall of the heating section 2 near the feed section 1. The plasma heating ring 3 is a hollow ring structure and is connected to an external high-pressure gas source through a pipeline. A plurality of plasma nozzles 9 are fixedly connected to the end of the plasma heating ring 3 near the heating section 2. An electrode is fixedly connected to each plasma nozzle 9. The plurality of electrodes are electrically connected to the controller to ensure precise control of the heating process.

[0045] The top of the heating section 2 is fixedly connected to a reaction section 4, which has a conical structure. The end with a larger diameter of the conical structure is arranged away from the heating section 2. The top of the reaction section 4 is fixedly connected to a discharge section 5, and the outer end of the discharge section 5 is fixedly connected to a discharge pipe 6 for discharging the reacted material out of the device.

[0046] An air intake ring 7 is fixedly connected to one end of the outer wall of the reaction section 4 near the heating section 2. The air intake ring 7 is a hollow ring structure and is connected to an external chlorine gas supply system through a pipeline. A plurality of reaction nozzles 10 perpendicular to the outer wall of the reaction section 4 are fixedly connected to one end of the air intake ring 7 near the reaction section 4. The plurality of reaction nozzles 10 all penetrate the reaction section 4 and extend to the inner wall of the reaction section 4 to ensure that chlorine can be evenly injected into the interior of the reaction section 4 and fully contact with the high-temperature quartz sand.

[0047] The inner walls of the heating section 2, the reaction section 4 and the discharge section 5 are all fixedly connected with a plurality of chemical electrodes 8, which are made of zinc, and the heating section 2, the reaction section 4 and the discharge section 5 are all made of iron. In order to prevent the corrosion of the inner wall and the electrodes of the device by chlorine gas and its reaction products, the inner walls of the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 are all coated with an alumina ceramic coating, which provides effective anti-corrosion protection and extends the service life of the device. In addition, the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 are all electrically connected to the controller to facilitate real-time monitoring and control of the entire purification process.

[0048] Working process:

[0049] During operation, quartz sand first enters the device through the feed section 1, and the controller starts the plasma heating ring 3, which discharges through the electrodes in the plasma nozzle 9 to generate high-temperature plasma flows. These plasma flows enter the heating section 2 under the impetus of high-pressure gas to heat the quartz sand. After being heated to the required high temperature in the heating section 2, the heated quartz sand enters the reaction section 4 along with the airflow.

[0050] At this time, the external chlorine gas supply system is started by the controller, and the chlorine gas is evenly injected into the reaction section 4 through the air inlet ring 7 and the reaction nozzle 10, and a chlorination reaction occurs with the high-temperature quartz sand, thereby removing impurities such as iron and aluminum in the quartz sand. The chloride (such as ferric chloride) produced by the reaction is discharged from the device through the discharge pipe 6.

[0051] During the reaction process, the inner walls of the heating section 2, reaction section 4 and discharge section 5 and the alumina ceramic coating of the chemical electrode 8 provide good corrosion protection. When it is detected that the alumina ceramic coating is damaged due to high temperature or chemical reaction, the controller automatically activates the electrochemical protection system to protect the heating section 2, reaction section 4, discharge section 5 and chemical electrode 8 by applying an external current, thereby further preventing the occurrence of corrosion.

[0052] Through the design of the plasma heating ring 3 and the plasma nozzle 9, the quartz sand is quickly and evenly heated, and the efficiency of chlorination purification is effectively improved.

[0053] The conical structural design of the reaction section 4, as well as the arrangement of the air inlet ring 7 and the reaction nozzle 10, ensures sufficient contact between the chlorine gas and the high-temperature quartz sand, thereby improving the impurity removal effect.

[0054] The alumina ceramic coating provides excellent corrosion protection for the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8, thereby extending the service life of the device.

[0055] Through real-time monitoring of the controller and the application of the electrochemical protection system, the protection mechanism can be quickly activated when the coating is damaged, effectively reducing the maintenance requirements and costs of the equipment.

[0056] Example 2

[0057] like Figures 1 to 10 As shown, this embodiment is further optimized and improved on the basis of embodiment 1. In the design of the heating section 2 of the device, multiple plasma nozzles 9 penetrate the heating section 2 and extend to the inner wall of the heating section 2. Each plasma nozzle 9 is a conical structure, and the end with a larger diameter of the conical structure is fixedly connected to the plasma heating ring 3. This design ensures that the plasma can be sprayed into the interior of the heating section 2 more concentratedly, thereby improving the heating efficiency of the quartz sand.

[0058] In addition, a partition 11 is fixedly connected to the bottom end of the feed section 1, a motor 12 is fixedly connected to the bottom end of the partition 11, a power shaft of the motor 12 passes through the partition 11, and a screw 13 is fixedly connected to the passing portion, an outer wall of the screw 13 is slidably connected to the inner wall of the feed section 1, and a top end of the screw 13 is flush with the top end of the feed section 1. This structural design ensures stable transportation of quartz sand in the feed section 1.

[0059] In order to further optimize the conveying process of quartz sand, the outer wall of the feed section 1 is fixedly connected with a symmetrically arranged flotation tube 14 and a feed tube 15, the flotation tube 14 is connected to an external high-pressure inert gas source, and one end of the flotation tube 14 close to the feed section 1 is fixedly connected with a porous baffle, and the through hole diameter of the baffle is smaller than the diameter of the quartz sand, ensuring that the inert gas can evenly enter the feed section 1 without causing the loss of quartz sand.

[0060] One end of the feed pipe 15 away from the feed section 1 is fixedly connected to a partition 2, and the end of the partition 2 away from the feed pipe 15 is fixedly connected to a motor 2 16, which is electrically connected to the controller. The power shaft of the motor 16 passes through the partition 2, and the passing part is fixedly connected to a screw 2 17, and the outer wall of the screw 2 17 is slidably connected to the inner wall of the feed pipe 15, and the end of the screw 2 17 close to the feed section 1 is three to five centimeters away from the feed section 1. This design ensures that quartz sand can stably and continuously enter the feed section 1 from the feed pipe 15.

[0061] In order to monitor the temperature changes inside the device in real time, multiple temperature sensors are fixedly connected to the inner walls of the feed section 1, heating section 2, reaction section 4 and discharge section 5. These temperature sensors can provide timely feedback on the temperature changes in each section, making it easier for the controller to make adjustments based on actual conditions, ensuring that the temperature during the purification process is always kept within the optimal range.

[0062] Working process:

[0063] During operation, quartz sand is first put into the feed hopper, and the motor 16 drives the screw 17 to push the quartz sand from the feed pipe 15 into the feed section 1. At this time, the screw 13 in the feed section 1 is driven by the motor 12 to push the quartz sand upward along the feed section 1. In this process, the flotation tube 14 evenly introduces high-pressure inert gas through the porous baffle to ensure that the quartz sand is in a suspended state in the feed section 1, effectively avoiding the accumulation and adhesion of particles.

[0064] When the quartz sand enters the heating section 2, the plasma heating system is started by the controller, and the electrodes in the multiple plasma nozzles 9 discharge to generate a high-temperature plasma flow. Since the plasma nozzle 9 is a conical structure and penetrates the heating section 2 and extends to the inner wall, the plasma can be sprayed more concentratedly to the internal area of ​​the heating section 2, thereby achieving rapid and uniform heating of the quartz sand. The heated quartz sand enters the reaction section 4 under the action of the inert gas in the flotation tube 14.

[0065] In the reaction section 4, chlorine gas is introduced through the air inlet ring 7 and the reaction nozzle 10 to react chemically with the heated quartz sand to remove impurities in the quartz sand. The reacted material is discharged from the device through the discharge section 5 and the discharge pipe 6, and the generated waste gas is discharged through the exhaust port and is subsequently treated as needed.

[0066] During the entire process, the controller adjusts the heating and gas flow of each section according to the real-time data feedback from the temperature sensor to ensure that the purification process is always in the best state. At the same time, the dual protection of alumina ceramic coating and electrochemical protection system ensures the long-term stable operation of the equipment in high temperature and corrosive environments.

[0067] Through the multiple plasma nozzles 9 penetrating the heating section 2 and the conical structure design thereof, concentrated injection of plasma is achieved, thereby improving the heating efficiency and uniformity of the quartz sand.

[0068] The arrangement of the partition plate 11 and the screw 13 in the feeding section 1 and the combination with the flotation tube 14 ensure the stability and fluidity of the quartz sand during the transportation process and effectively prevent the accumulation and blockage of particles.

[0069] The reasonable layout design of the feed pipe 15 and the feed section 1, as well as the stable conveying mechanism of the screw 2 17, further optimizes the feeding process of the quartz sand and ensures the continuity and efficiency of the entire purification process.

[0070] The arrangement of temperature sensors enables the device to monitor and adjust the temperature of each section in real time, ensuring efficient operation of the quartz sand purification process and reducing the risk of incomplete reaction or device damage due to temperature fluctuations.

[0071] The dual protection of alumina ceramic coating and electrochemical protection system effectively extends the service life of the device and reduces the maintenance cost of the equipment.

[0072] Example 3

[0073] like Figures 1 to 10 As shown, based on Examples 1 and 2, this example further optimizes the operating procedures and control system of the device to achieve a more efficient quartz sand purification process. The core technical solutions of this example include feeding, flotation suspension, plasma heating, chlorination reaction, corrosion protection and discharge of the final product. In order to enhance the control of temperature and reaction process, the real-time monitoring and adjustment functions of the controller for each step are further refined.

[0074] In step S1, the quartz sand to be purified is placed in the feed hopper 18, and the controller starts the motor 16 to drive the screw 17 to rotate, so that the quartz sand is gradually pushed from the feed hopper 18 into the feed section 1 and begins to enter the purification device. To ensure the continuous feeding of the quartz sand, the speed of the screw 17 is adjusted in real time by the controller according to the feed rate to prevent blockage or unevenness during the feeding process.

[0075] In step S2, the motor 12 is started to drive the screw 13 to rotate. The screw 13 pushes the quartz sand upward along the feeding section 1 during the rotation. At the same time, the flotation tube 14 introduces high-pressure inert gas (such as argon or nitrogen) to make the quartz sand form a suspended state in the feeding section 1 and the heating section 2. The inert gas is evenly distributed through the porous baffle to ensure the uniformity of the airflow in the feeding section 1 and the heating section 2, effectively avoiding the adhesion and accumulation between the quartz sand particles, and ensuring the uniform heating of the quartz sand.

[0076] In step S3, the plasma heating system is started by the controller, and the electrodes in the multiple plasma nozzles 9 discharge under the action of high-pressure gas (such as argon gas) to generate a high-temperature plasma flow. Since the plasma nozzle 9 is a conical structure and penetrates the heating section 2 and extends to the inner wall, the plasma flow can better cover the internal area of ​​the heating section 2, uniformly heat the quartz sand particles in the suspended state, and quickly increase the temperature of the quartz sand to the high temperature state required for the chlorination reaction.

[0077] In step S4, after the quartz sand is heated to the required temperature, the quartz sand enters the reaction section 4 under the effect of air flotation and the pushing of the screw 13, and the chlorine gas supply system is started through the air inlet ring 7. The multiple reaction nozzles 10 uniformly inject chlorine into the reaction section 4, and the chlorine reacts chemically with the high-temperature quartz sand to remove impurities such as iron and aluminum in the quartz sand to generate volatile chlorides (such as ferric chloride). These chlorides enter the discharge section 5 with the air flow and are discharged through the discharge pipe 6.

[0078] In step S5, during the chlorination reaction, the inner walls of the heating section 2, the reaction section 4 and the discharge section 5 and the chemical electrode 8 are coated with an alumina ceramic coating to prevent chlorine and its reaction products from corroding the equipment and the electrodes. The controller monitors the integrity of the alumina ceramic coating in real time. When it detects that the coating is damaged due to high temperature or chemical reaction, the electrochemical protection system is automatically activated to protect the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 by applying an external current to further prevent the occurrence of corrosion.

[0079] In step S6, the controller monitors the temperature and resistance changes in the entire purification process in real time through the connected temperature sensors and resistance sensors to detect corrosion inside the device. When signs of corrosion are detected, the controller ensures the integrity and long-term stability of the equipment and electrodes by adjusting the external current or adjusting the chlorine flow rate.

[0080] In step S7, the ferric chloride generated after the chlorination reaction further reacts with the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 to generate ferrous chloride and zinc chloride. The zinc chloride forms a protective film on the inner wall of the equipment, which acts as a sacrificial anode to protect the base metal from further corrosion. At the same time, the ferrous chloride slows down the corrosion rate of iron to a certain extent, ensuring the service life of the equipment.

[0081] In step S8, the purified quartz sand is discharged through the discharge section 5, and the gases and volatile chlorides generated in the process are discharged through the exhaust port. In order to meet environmental protection requirements, these gases can be further treated by special filtering and treatment devices before being discharged to ensure that the emissions meet environmental protection standards.

[0082] When using;

[0083] The quartz sand to be purified is placed in the feed hopper 18, and then the motor 16 drives the screw 17 to rotate to push the quartz sand from the feed hopper 18 into the feed section 1;

[0084] Then, the motor 12 drives the screw 13 to rotate, and the screw 13 pushes the quartz sand into the motor 12 during the rotation process. In the process, the inert gas is introduced through the air flotation tube 14. When the inert gas flows through the inside of the feeding section 1 and the heating section 2, the quartz sand in the feeding section 1 and the heating section 2 is blown, so that the quartz sand is in a suspended state;

[0085] When the quartz sand enters the heating section 2, the controller discharges the electrodes in the plasma nozzle 9 to generate plasma, and the plasma is ejected from the multiple plasma nozzles 9 under the blowing of high-pressure gas to heat the quartz sand;

[0086] The heated quartz sand moves upward into the reaction section 4 under the action of the air pressure in the air flotation tube 14 and the screw 13 in the feed section 1. At this time, chlorine gas is introduced into the reaction section 4 through the reaction nozzle 10 on the air inlet ring 7. The chlorine gas reacts with the quartz sand to remove impurities such as iron in the quartz sand.

[0087] During this process, the alumina ceramic coating prevents the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 from being corroded. If the alumina ceramic coating is damaged during use, electrochemical protection is formed by the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8;

[0088] During this process, the controller monitors the resistance changes of the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 in real time. When it is detected that the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 begin to be corroded, the controller protects the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 by applying an external current.

[0089] In this process, chlorine reacts with the iron element in the quartz sand to produce ferric chloride, which further reacts with the heating section 2, the reaction section 4, the discharge section 5 and the chemical electrode 8 to produce ferrous chloride and zinc chloride. The ferrous chloride can slow down the corrosion rate of iron to a certain extent, and the zinc chloride layer can serve as a sacrificial anode to protect the base metal.

[0090] In step S1, the controller accurately controls the motor 16 and the screw 17 to ensure stable feeding of quartz sand and avoid blockage and unevenness that may occur during the feeding process.

[0091] In step S2, the air flotation system in the feeding section 1 and the heating section 2 effectively maintains the suspension state of the quartz sand, prevents the particles from sticking and piling up, and ensures uniform heating of the quartz sand.

[0092] In step S3, the design of the conical plasma nozzle 9 and its arrangement throughout the heating section 2 ensure that the high-temperature plasma flow fully covers the quartz sand, improves the heating efficiency and uniformity, and enables the quartz sand to quickly reach the temperature required for the chlorination reaction.

[0093] In step S4, the reasonable configuration of the air inlet ring 7 and the reaction nozzle 10 ensures sufficient contact between the chlorine gas and the quartz sand, improves the efficiency of impurity removal, and ensures the high efficiency of the purification process.

[0094] In step S5, the combination of alumina ceramic coating and electrochemical protection system provides long-term corrosion protection for the device and extends the service life of the equipment.

[0095] In step S6, the real-time monitoring function of temperature and resistance enables the controller to make timely adjustments to the temperature and corrosion conditions during the purification process, ensuring the safety and stability of the entire process.

[0096] In step S7, the generated zinc chloride and ferrous chloride provide additional corrosion protection for the equipment, reduce the corrosion rate of iron, and further extend the service life of the equipment.

[0097] In step S8, waste gas and volatile chlorides generated during the purification process are effectively treated through a reasonably designed discharge and waste gas treatment system, meeting environmental protection requirements and reducing the impact on the environment.

[0098] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A device for high temperature chlorination purification of quartz sand, characterized in that: The invention comprises a controller and a feeding section (1), wherein the top of the feeding section (1) is fixedly connected to a heating section (2), and the outer wall of the heating section (2) is fixedly connected to an end near the feeding section (1) with a plasma heating ring (3), wherein the plasma heating ring (3) is a hollow ring-shaped structure, and the hollow part is connected to an external high-pressure gas source through a pipeline, wherein the end of the plasma heating ring (3) near the heating section (2) is fixedly connected to a plurality of plasma nozzles (9), and each plasma nozzle (9) is fixedly connected to an electrode, and the plurality of electrodes are electrically connected to the controller, wherein the top of the heating section (2) is fixedly connected to a reaction section (4), wherein the reaction section (4) is a conical structure, and the end with a larger diameter of the conical structure is arranged away from the heating section (2), wherein the top of the reaction section (4) is fixedly connected to a discharge section (5), and the outer end of the discharge section (5) is fixedly connected to a discharge pipe (6), and the outer wall of the reaction section (4) is fixedly connected to an air intake ring at one end near the heating section (2). (7), the air intake ring (7) is fixedly connected to one end near the reaction section (4) with a plurality of reaction nozzles (10) perpendicular to the outer wall of the reaction section (4), and the plurality of reaction nozzles (10) all penetrate the reaction section (4) and extend to the inner wall of the reaction section (4), the air intake ring (7) is a hollow ring structure, and the hollow part is connected to an external chlorine gas supply system through a pipeline, and the plurality of reaction nozzles (10) are all connected to the hollow part of the air intake ring (7), the inner walls of the heating section (2), the reaction section (4) and the discharge section (5) are fixedly connected with a plurality of chemical electrodes (8), and the plurality of chemical electrodes (8) are all made of zinc, the heating section (2), the reaction section (4) and the discharge section (5) are all made of iron, the inner walls of the heating section (2), the reaction section (4), the discharge section (5) and the chemical electrode (8) are all coated with an alumina ceramic coating, and the heating section (2), the reaction section (4), the discharge section (5) and the chemical electrode (8) are all electrically connected to a controller.

2. The device for high temperature chlorination purification of quartz sand according to claim 1, characterized in that: The ends of the plurality of plasma nozzles (9) close to the heating section (2) all penetrate the heating section (2) and extend to the inner wall of the heating section (2); the plurality of plasma nozzles (9) are all conical structures, and the end of the conical structure with a larger diameter is fixedly connected to the plasma heating ring (3).

3. The device for high temperature chlorination purification of quartz sand according to claim 1, characterized in that: The bottom end of the feed section (1) is fixedly connected to a partition plate (11), the bottom end of the partition plate (11) is fixedly connected to a motor (12), the motor (12) is electrically connected to a controller, a power shaft of the motor (12) passes through the partition plate (11), and a screw (13) is fixedly connected to the passing part, and the outer end of the reaction section (4) is fixedly connected to a base.

4. The device for high temperature chlorination purification of quartz sand according to claim 3, characterized in that: The outer wall of the screw rod 1 (13) is slidably connected to the inner wall of the feed section (1), the top of the screw rod 1 (13) is flush with the top of the feed section (1), and the discharge pipe (6) is arranged to be tilted downward away from one end of the discharge section (5).

5. The device for high temperature chlorination purification of quartz sand according to claim 1, characterized in that: The outer wall of the feed section (1) is fixedly connected with a symmetrically arranged air flotation tube (14) and a feed tube (15), the air flotation tube (14) is connected to an external high-pressure inert gas source, and one end of the air flotation tube (14) close to the feed section (1) is fixedly connected with a porous baffle, and the diameter of the baffle through hole is smaller than the diameter of the quartz sand.

6. The device for high temperature chlorination purification of quartz sand according to claim 5, characterized in that: The end of the feed pipe (15) away from the feed section (1) is fixedly connected to a partition plate 2, and the end of the partition plate 2 away from the feed pipe (15) is fixedly connected to a motor 2 (16), and the motor 2 (16) is electrically connected to the controller. The power shaft of the motor 2 (16) passes through the partition plate 2, and the passing part is fixedly connected to a screw rod 2 (17).

7. The device for high temperature chlorination purification of quartz sand according to claim 6, characterized in that: The outer wall of the second screw (17) is slidably connected to the inner wall of the feed pipe (15); the end of the second screw (17) close to the feed section (1) is three to five centimeters away from the feed section (1); and a plurality of temperature sensors are fixedly connected in the feed section (1), the heating section (2), the reaction section (4) and the discharge section (5).

8. The device for high temperature chlorination purification of quartz sand according to claim 5, characterized in that: The upper end of the outer wall of the feed pipe (15) away from one end of the feed section (1) is fixedly connected to a feed hopper, and the top end of the discharge section (5) is fixedly connected to an exhaust port.

9. A device and method for purifying quartz sand by high temperature chlorination according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Put the quartz sand to be purified into the feed hopper (18), start the motor 2 (16) through the controller to drive the screw 2 (17) to rotate, and gradually push the quartz sand from the feed hopper (18) into the feed section (1), and start entering the purification device; S2: starting the motor 1 (12) to drive the screw 1 (13) to rotate. The screw 1 (13) pushes the quartz sand upward along the feeding section (1) during the rotation process. At the same time, a high-pressure inert gas (such as argon or nitrogen) is introduced into the feeding section (1) and the heating section (2) through the air flotation tube (14). When the inert gas flows through the feeding section (1) and the heating section (2), the quartz sand particles are blown to suspend them, thereby avoiding adhesion and accumulation between the particles and ensuring uniform heating; S3: starting the plasma heating system through the controller, the electrodes in the plurality of plasma nozzles (9) discharge under the action of high-pressure gas (such as argon), generating a high-temperature plasma flow, the plasma flow is ejected into the heating section (2) through the plasma nozzle (9), uniformly heating the quartz sand particles in the suspended state, and rapidly raising the temperature of the quartz sand to the high temperature state required for the chlorination reaction; S4: When the quartz sand is heated to the required temperature, the quartz sand enters the reaction section (4) under the action of air flotation and the pushing of the screw (13). At this time, the chlorine gas supply system is started through the air inlet ring (7), and the multiple reaction nozzles (10) uniformly inject chlorine gas into the reaction section (4). The chlorine gas reacts chemically with the high-temperature quartz sand to remove impurities such as iron and aluminum in the quartz sand and generate volatile chloride (such as ferric chloride); S5: During the chlorination reaction, the inner walls of the heating section (2), the reaction section (4) and the discharge section (5) and the chemical electrode (8) are coated with an alumina ceramic coating to prevent the corrosion of the equipment and the electrode by chlorine and its reaction products. When it is detected that the alumina ceramic coating is damaged due to high temperature or chemical reaction, the controller automatically activates the electrochemical protection system to protect the heating section (2), the reaction section (4), the discharge section (5) and the chemical electrode (8) by applying an external current, thereby further preventing the occurrence of corrosion; S6: During the entire purification process, the controller monitors the resistance changes of the heating section (2), the reaction section (4), the discharge section (5) and the chemical electrode (8) in real time to detect corrosion. When corrosion signs are detected, the controller adjusts the impressed current or other protective measures to ensure the integrity and long-term stability of the equipment and the electrode; S7: The ferric chloride generated after the chlorination reaction further reacts with the heating section (2), the reaction section (4), the discharge section (5) and the chemical electrode (8) to generate ferrous chloride and zinc chloride. The zinc chloride forms a protective film on the inner wall of the equipment, acting as a sacrificial anode to protect the base metal from further corrosion. At the same time, the ferrous chloride slows down the corrosion rate of iron to a certain extent, thereby ensuring the service life of the equipment. S8: The purified quartz sand is discharged through the discharge section (5), and the gas and volatile chloride generated during the purification process are discharged through the exhaust port. The gas is further processed to meet environmental protection requirements.

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