Quartz sand chlorination purification equipment

Abstract

The invention relates to the field of quartz sand purification, in particular to quartz sand chlorination purification equipment. The invention discloses quartz sand chlorination purification equipment which comprises a rack, the roasting system comprises a roasting furnace and a roasting pipe, and the roasting pipe is provided with a feeding port and an air suction port; the condensation system comprises a condensation furnace and a condensation pipe, and the condensation pipe is provided with a feed opening and an air supply opening; the transition material conveying device comprises a material conveying sleeve, and the material conveying sleeve is provided with a first annular flange in clearance fit with the inner wall of the roasting pipe, a second annular flange in interference fit with the inner wall of the condensation pipe and a transition section; and a rotation driving mechanism; wherein the roasting pipe and the condensing pipe are arranged at an inclined included angle of 3-8 degrees, and the height of the feeding hole is higher than that of the discharging hole, so that a continuous gradient material conveying channel is formed. The method has the effect of reducing the dissipation of the chlorinated gas in the quartz sand purification stage.

Description

Technical Field

[0001] The invention relates to the field of quartz sand purification, in particular to quartz sand chlorination purification equipment. Background Art

[0002] Quartz sand is a common non-metallic mineral raw material in nature and is widely used. Ordinary quartz sand is mainly used in traditional fields such as glass products, building materials, ceramic products, mechanical casting, cement products, refractory materials, etc., which do not require high purity of quartz sand. Its preparation is simple, and the requirements can be met by simply screening the raw ore or using a simple beneficiation process. High-purity quartz sand refers to quartz sand with a SiO2 content greater than 99.995%. High-purity quartz sand is the only raw material for quartz glass and its products, and is mainly used in high-tech industries such as aerospace, bioengineering, high-frequency technology, electronic technology, optical fiber communications and military industry. With the rapid development of science and technology, the market demand for high-purity quartz sand will continue to grow at a high speed, and its strategic position is very important.

[0003] The main impurity elements of quartz sand are Al, Ca, Fe, Na, K, Li, Mg, Cr, Ni, B, Mn, Cu, Ti, etc. According to their occurrence forms, they can be divided into gangue mineral impurities, inclusion impurities and crystal structure impurities. Chlorination roasting is a commonly used purification method in mineral processing, that is, at a specific temperature and atmosphere, the target component in the mineral is converted into chloride in the gas phase or condensed phase by a chlorinating agent, thereby separating it from the mineral system. In the industrial production process, HCl gas is generally used as a chlorinating agent to ensure the continuity, stability and safety of production.

[0004] Existing quartz sand chlorination purification equipment generally includes a frame; a roasting system, which includes a roasting furnace arranged on the frame, and a roasting tube penetrating the roasting furnace, wherein the roasting tube is provided with a feed inlet for the quartz sand to be purified to enter and an air intake port for suction through negative pressure at the feed end; a condensation system, which includes a condensation furnace coaxially arranged with the roasting system, and a condensation tube penetrating the condensation furnace, wherein the condensation tube is provided with a discharge port for the purified quartz sand to be discharged at the discharge end, and an air supply port for providing chlorination gas.

[0005] During the implementation of relevant technologies, there is a technical bottleneck in the airtightness assurance mechanism at the joint of the calcination tube and the condenser tube. The main manifestation is that the gaseous medium in the high-temperature chlorination reaction system is prone to gradient pressure difference escape in the joint area between the calcination tube and the condenser tube. This gas escape phenomenon is not only easy to cause corrosion to the equipment, but also leads to a decrease in chlorination efficiency. Summary of the invention

[0006] In order to solve part or all of the above technical problems, the present invention provides a quartz sand chlorination purification device.

[0007] A quartz sand chlorination purification device, comprising: a frame; a roasting system, which comprises a roasting furnace arranged on the frame, and a roasting tube penetrating the roasting furnace, wherein the roasting tube is provided with a feed inlet for the quartz sand to be purified and an air inlet for suction through negative pressure at the feed end; a condensing system, which comprises a condensing furnace coaxially arranged with the roasting system, and a condensing tube penetrating the condensing furnace, wherein the condensing tube is provided with a discharge inlet for the purified quartz sand to be discharged at the discharge end, and an air supply inlet for providing chlorinated gas; a transition material transfer device, which comprises a coaxial sleeve connected to the A material transfer sleeve at the junction of the roasting tube and the condensing tube, the material transfer sleeve having a first annular flange that is gap-fitted with the inner wall of the roasting tube, a second annular flange that is interference-fitted with the inner wall of the condensing tube, and a transition section connecting the first annular flange and the second annular flange; and a rotary drive mechanism, which is arranged at the junction of the roasting furnace and the condensing furnace and is respectively connected to the roasting tube and the condensing tube through a transmission assembly; wherein the roasting tube and the condensing tube are arranged at an inclined angle of 3°-8°, and the height of the feed port is higher than that of the discharge port, forming a continuous gradient material transfer channel.

[0008] By adopting the above scheme, the inclined roasting tube and the condensing tube drive the quartz sand material to be purified to rotate through their own rotation, so that the quartz sand material is successively roasted at high temperature in the roasting furnace, transported by the material transfer sleeve, and discharged from the discharge port after condensation in the condensing tube. At the same time, the height difference between the feed port and the discharge port forms a directional airflow channel, so that the chlorinated gas is transported in the opposite direction of the quartz sand material, and reacts with the quartz sand material to purify the quartz sand material. The material transfer sleeve is simultaneously sleeved between the roasting tube and the condensing tube, which effectively reduces the probability of chlorinated gas escaping at the junction of the roasting furnace and the condensing furnace, and because the second annular flange and the inner wall of the condensing tube are interference fit, on the one hand, the material transfer sleeve can rotate with the condensing tube, and on the other hand, it also reduces the probability of chlorinated gas escaping at the connection between the second annular flange and the condensing tube. At this time, the gap between the first annular flange and the roasting tube is opposite to the conveying direction of the chlorinated gas, further reducing the probability of chlorinated gas escaping at the junction of the first annular flange and the roasting tube.

[0009] Optionally, the roasting tube and the condensing tube are both made of single crystal growth grade quartz tube, the silicon dioxide purity of which is not less than 99.99%, and the tube wall thickness is 8-15mm; the inner surface of the material transfer sleeve is plated with a silicon nitride protective layer.

[0010] By adopting the above solution, high-purity quartz tubes can withstand high-temperature chlorination corrosion, and the silicon nitride-coated material transfer sleeve matches the thermal expansion characteristics of the quartz material, avoiding interface stress damage caused by temperature changes and significantly improving the operating stability of the equipment under high-temperature conditions.

[0011] Optionally, the roasting furnace includes: a first insulation layer, which is sleeved outside the roasting tube and has a first through hole reserved for the roasting tube to pass through horizontally; a heating device, which is arranged between the first insulation layer and the roasting tube and is used to heat the roasting tube.

[0012] By adopting the above technical solution, the combined design of the insulation layer and the heating equipment can achieve precise temperature control. The dynamic gap structure not only ensures the heat conduction efficiency, but also provides a buffer space for the thermal expansion of the roasting tube, ensuring the uniformity of the heating of the quartz sand and extending the service life of the tube body.

[0013] Optionally, the condensing furnace includes: a second thermal insulation layer, which is sleeved outside the condensing tube and has a second through hole reserved for the condensing tube to pass through horizontally; a condensing device, which is arranged between the second thermal insulation layer and the condensing tube and is used to cool the condensing tube.

[0014] By adopting the above technical solution, the synergistic effect of the insulation jacket and the gradient refrigeration system forms a controllable condensation environment, and the metal chlorides with different boiling points are selectively precipitated through staged cooling, which significantly improves the impurity separation efficiency.

[0015] Optionally, the heating equipment adopts a distributed multi-zone temperature control structure, including multiple groups of silicon carbide coated heating elements equidistantly arranged along the axial direction of the roasting tube, forming a temperature gradient of 50-80°C between adjacent intervals; the condensing equipment includes a two-stage condensing unit: the first stage is a spiral copper coil wrapped around the outer wall of the condensing tube, and a -15°C ethylene glycol solution is passed through it; the second stage is a semiconductor refrigeration plate group attached to the spiral copper coil.

[0016] By adopting the above technical solution, the semiconductor refrigeration chip array forms a temperature gradient in the axial direction of the condenser tube, so that the chlorinated products (such as FeCl 3 、AlCl 3 ) Condensation deposition in stages.

[0017] Optionally, the rotary drive mechanism includes: a permanent magnet synchronous magnetic levitation direct drive motor, whose dual output shafts are respectively connected to the roasting tube and the condensing tube through a universal joint; a photoelectric encoder assembled in the coupling to monitor the speed difference between the roasting tube and the condensing tube in real time ≤0.5rpm.

[0018] By adopting the above technical solutions, the magnetic levitation direct drive technology realizes double-tube contactless transmission, the photoelectric monitoring system ensures the speed synchronization, eliminates the risk of mechanical vibration damaging the sealing structure, and improves the reliability of equipment operation.

[0019] Optionally, the rotary drive mechanism also includes a planetary gear reducer with an output torque range of 80-120 N·m and a speed control accuracy of ±0.2 r / min; wherein the drive control system dynamically adjusts the speed ratio of the roasting tube and the condensing tube to 1:0.98-1.02 according to the material transmission speed.

[0020] By adopting the above technical solution, the dynamic speed adjustment mechanism balances the material transfer rate and process parameters, and the planetary gear reduction device provides stable torque output to meet the purification needs of quartz sand with different particle sizes.

[0021] Optionally, the discharge end of the roasting tube forms a conical expansion structure, and the inner conical surface of the structure forms a clearance fit with the outer conical surface of the feed end of the condensing tube.

[0022] By adopting the above technical solution, the tapered expansion structure allows the pipe body to expand and deform due to heat, and the clearance fit design avoids stress concentration at the connection under high temperature conditions, thereby reducing the frequency of equipment maintenance.

[0023] Optionally, an expanded graphite sealing ring is filled between the matching surfaces of the conical expansion structure of the roasting tube and the outer conical surface of the condenser tube.

[0024] By adopting the above technical solution, the expanded graphite sealing ring maintains elastic sealing performance in a high-temperature chlorinated environment, and the self-compensation characteristics effectively fill the fitting gap and construct a multiple anti-leakage barrier.

[0025] Optionally, the inner wall of the material transfer sleeve is provided with a spiral guide groove with a groove depth of 2-3 mm and a pitch of 1.2-1.5 times the pipe diameter.

[0026] By adopting the above technical solutions, the spiral guide structure optimizes the material movement trajectory, and cooperates with the surface modification layer to inhibit dust adhesion, thereby simultaneously achieving air tightness enhancement and pipeline self-cleaning functions.

[0027] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects: 1. This technical solution enhances the mass transfer efficiency through gas-solid counter-flow, so that the chlorinated gas and quartz sand form an efficient contact reaction; the innovatively designed dynamic sealing system adopts a combination structure of interference fit and clearance fit to form a pressure gradient barrier layer under rotating conditions, significantly reducing the risk of gas escape; 2. The coaxial sleeve connection between the material transfer sleeve, the roasting tube and the condensing tube realizes seamless connection of the thermal system, which not only ensures the smooth transition from the high temperature zone to the condensing zone, but also assists material transmission through centrifugal force. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the purification equipment of an embodiment of the present application; Figure 2 for Figure 1 A front view of the purification equipment; Figure 3 To reflect Figure 1 A cross-sectional view of the transition material transfer system in FIG. Figure 4 for Figure 3A partial enlargement of area A in the middle.

[0029] Description of reference numerals: 1. roasting system; 11. roasting furnace; 111. first insulation layer; 112. first through hole; 12. roasting tube; 121. feed port; 122. air intake port; 2. Condensation system; 21. Condensation furnace; 211. Second insulation layer; 212. Second through hole; 22. Condensation pipe; 221. Feeding port; 222. Air supply port; 3. Transition material transfer system; 31. Material transfer sleeve; 311. First annular flange; 312. Second annular flange; 313. Transition section; 32. Partition plate; 33. Spiral structure; 4. Rotation drive mechanism. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 -Attached Figure 4 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0031] The embodiment of the invention discloses a quartz sand chlorination purification device. Figure 1 This is a schematic diagram of the structure of the purification equipment in the embodiment of the present application. Figure 2 for Figure 1 The front view of the purification equipment. It should be noted that in order to more intuitively reflect the internal pipe connection method of the purification equipment, Figure 2 Tilt at a certain angle. Figure 3 This is a cross-sectional view of a purification device according to an embodiment of the present application.

[0032] Reference Figures 1 to 3, a quartz sand chlorination purification equipment, including a frame, a roasting system 1, a condensing system 2, a transition material transfer device and a rotary drive mechanism 4. The roasting system 1 includes a roasting furnace 11 arranged on the frame, and a roasting tube 12 penetrating the roasting furnace 11, and the roasting tube 12 is provided with a feed inlet 121 for the quartz sand to be purified to enter at the feed end and an air inlet 122 for suction through negative pressure. The condensing system 2 includes a condensing furnace 21 coaxially arranged with the roasting system 1 and a condensing tube 22 penetrating the condensing furnace 21, and the condensing tube 22 is provided with a discharge port 221 for the purified quartz sand to be discharged at the discharge end, and a gas supply port 222 for providing chlorinated gas (HCl). The chlorinated gas in this application refers to HCl gas. Although the three chlorinating agents HCl, Cl2 and their mixed gas can all have obvious removal effects on impurities such as Na, Fe, and K, HCl has the best purification effect, followed by the mixed gas of HCl and Cl2. Under the optimal conditions, the removal rates of Na, Fe and K by HCl are 73.8%, 82.9% and 30%, respectively. When the temperature in the roasting tube increases from 900°C to 1000°C, HCl has an improved effect on the removal of impurity elements. The transition material transfer device comprises a material transfer sleeve 31 coaxially sleeved at the junction of the roasting tube 12 and the condenser tube 22, and the material transfer sleeve 31 has a first annular flange 311 with a clearance fit with the inner wall of the roasting tube 12, a second annular flange 312 with an interference fit with the inner wall of the condenser tube 22, and a transition section 313 connecting the first annular flange 311 and the second annular flange 312.

[0033] The rotary drive machine is arranged at the junction of the roasting furnace 11 and the condensing furnace 21, and is respectively connected to the roasting tube 12 and the condensing tube 22 through the transmission assembly, wherein the roasting tube 12 and the condensing tube 22 are arranged at an inclined angle of 3°-8°. By setting the roasting tube 12 and the condensing tube 22 at an inclined angle of 3°-8°, the automatic transportation of quartz sand is realized by gravity, and the driving energy consumption is reduced compared with the traditional horizontal pipeline. It should be noted that the height of the feed port 121 is higher than the discharge port 221, forming a continuous gradient material transfer channel, and the height difference between the feed port 121 and the discharge port 221 forms a negative pressure gradient field, so that the chlorinated gas flows in a directional manner to avoid backflow pollution.

[0034] The inclined calcining tube 12 and the condensing tube 22 drive the quartz sand material to be purified to rotate by their own rotation, so that the quartz sand material is successively subjected to high-temperature calcination in the calcining furnace 11, conveyed by the material transfer sleeve 31, and condensed in the condensing tube 22 and discharged from the discharge port 221. At the same time, the height difference between the feed port 121 and the discharge port 221 forms a directional airflow channel, so that the chlorinated gas is conveyed in the opposite direction to the quartz sand material, and reacts with the quartz sand material to purify the quartz sand material. The material transfer sleeve 31 is simultaneously sleeved between the roasting tube 12 and the condensing tube 22, which effectively reduces the probability of chlorinated gas escaping at the joint between the roasting furnace 11 and the condensing furnace 21. Since the second annular flange 312 and the inner wall of the condensing tube 22 are interference fit, on the one hand, the material transfer sleeve 31 can rotate with the condensing tube 22, and on the other hand, it also reduces the probability of chlorinated gas escaping at the connection between the second annular flange 312 and the condensing tube 22. At this time, the gap between the first annular flange 311 and the roasting tube 12 is opposite to the conveying direction of the chlorinated gas, which further reduces the probability of chlorinated gas escaping at the joint between the first annular flange 311 and the roasting tube 12.

[0035] Figure 4 for Figure 3 A partial enlarged view of the middle area A shows the partition 32 and the spiral structure 33 of the transition material transfer system 3. The partition 32 is annular and is arranged inside the first annular flange 311. The spiral structure 33 is fixedly connected between the partition 32 and the inner side wall of the first annular flange 311. Through the arrangement of the spiral structure 33, the material in the roasting tube 12 can be guided, thereby reducing the accumulation of materials in the roasting tube 12.

[0036] As an embodiment, the calcining tube 12 and the condensing tube 22 are both made of single crystal growth grade quartz tubes, the purity of which is not less than 99.99% of silicon dioxide. 2 ≥99.99%), the thermal deformation is less than 0.05mm / m at a high temperature of 1200℃, ensuring the dimensional stability of the high-temperature chlorination reaction container. The wall thickness of the roasting tube 12 and the condenser tube 22 is 8-15mm, and the wall thickness of 8-15mm can withstand an internal air pressure of 0.6-0.8MPa, which is 3 times higher than the bursting strength of conventional pipes. The inner surface of the transfer sleeve 31 is coated with a silicon nitride protective layer. The silicon nitride coating controls the difference in thermal expansion coefficient between the transfer sleeve 31 and the quartz tube to 5×10⁻ 7 / ℃, avoiding interface cracking caused by thermal stress, and extending the equipment life to more than 8000 hours. High-purity quartz tubes are resistant to high-temperature chlorination corrosion, and the silicon nitride-coated material transfer sleeve 31 matches the thermal expansion characteristics of the quartz material, avoiding interface stress damage caused by temperature changes, and significantly improving the equipment operation stability under high-temperature conditions.

[0037] The roasting furnace 11 includes a first insulation layer 111 which is sleeved outside the roasting tube 12 and has a first through hole 112 reserved for the roasting tube 12 to pass through horizontally. The first insulation layer 111 is preferably made of nano aerogel and its thermal conductivity is guaranteed to be ≤0.018W / (m·K), which can effectively reduce heat loss compared with traditional ceramic fiber insulation materials. A heating device for heating the roasting tube 12 is provided between the first insulation layer 111 and the roasting tube 12. Preferably, a dynamic gap design of 0.5-1mm should be maintained between the heating device and the roasting tube 12, which not only ensures the heat conduction efficiency (heat transfer coefficient reaches 85-90W / m²·K) but also avoids mechanical stress caused by thermal expansion of the tube body. The combined design of the insulation layer and the heating device realizes precise temperature control. The dynamic gap structure not only ensures the heat conduction efficiency, but also provides a buffer space for the thermal expansion of the roasting tube 12, ensures the uniformity of heating of the quartz sand and prolongs the service life of the tube body.

[0038] The heating equipment adopts a distributed multi-segment temperature control structure, which specifically includes a plurality of groups of silicon carbide coated heating elements equidistantly arranged along the axial direction of the roasting tube 12, and a temperature gradient of 50-80°C is formed between adjacent intervals. The multi-segment silicon carbide heating elements form a 50-80°C gradient temperature field in the axial direction of the roasting tube 12, so that the quartz sand undergoes three stages of preheating (600-800°C), chlorination reaction (1000-1200°C), and slow cooling (900-700°C) in sequence, thereby significantly reducing the lattice defect rate.

[0039] The condensing furnace 21 includes a second insulation layer 211 which is sleeved outside the condensing tube 22 and has a second through hole 212 reserved for the condensing tube 22 to pass horizontally. In addition to being made of nano aerogel, the second insulation layer 211 can also be made of a vacuum insulation jacket. A condensing device for cooling the condensing tube 22 is also provided between the second insulation layer 211 and the condensing tube 22. The condensing device includes a two-stage condensing unit: the first stage is a spiral copper coil wrapped around the outer wall of the condensing tube 22, and a -15°C ethylene glycol solution is passed through it; the second stage is a semiconductor refrigeration sheet group attached to the spiral copper coil. The semiconductor refrigeration sheet array forms a temperature gradient of 5-8°C / m in the axial direction of the condensing tube 22, so that the chlorinated product (such as FeCl 3 、AlCl 3 ) condensation and deposition in stages. The secondary condensation system 2 enables the gas phase impurities to be captured in a step-by-step manner. A controllable condensation environment is formed through the synergistic effect of the second insulation layer 211 and the gradient refrigeration system, and the metal chlorides with different boiling points are selectively precipitated by staged cooling, which significantly improves the impurity separation efficiency.

[0040] The rotary drive mechanism 4 includes a permanent magnet synchronous magnetic suspension direct drive motor and a photoelectric encoder. The dual output shafts of the permanent magnet synchronous magnetic suspension direct drive motor are respectively connected to the roasting tube 12 and the condensing tube 22 through a universal joint, so that the roasting tube 12 and the condensing tube 22 can rotate synchronously. The photoelectric encoder monitors the speed difference between the roasting tube 12 and the condensing tube 22 in real time ≤ 0.5rpm. The photoelectric encoder monitors the synchronization of the speeds of the two tubes in real time, controls the speed difference within 0.5rpm, avoids coking of the tube wall caused by material accumulation, and effectively reduces the equipment failure rate.

[0041] The rotary drive mechanism 4 also includes a planetary gear reducer, whose output torque range is 80-120N·m and the speed control accuracy is ±0.2r / min; wherein, the speed ratio of the roasting tube 12 and the condensing tube 22 is dynamically adjusted to 1:0.98-1.02 according to the material transmission speed. Through the drive control system, the dynamic adjustment mechanism balances the material transmission rate and the process parameters, and the planetary gear reducer provides a stable torque output to meet the purification needs of quartz sand with different particle sizes.

[0042] The discharge end of the roasting tube 12 forms a conical expansion structure, and its inner conical surface forms a clearance fit with the outer conical surface of the feed end of the condenser tube 22. The conical expansion clearance fit (clearance amount 0.1-0.3mm) allows the roasting tube 12 and the condenser tube 22 to have an axial expansion difference (maximum 3-5mm) at high temperature. The clearance fit design avoids stress concentration at the connection under high temperature conditions and reduces the frequency of equipment maintenance.

[0043] An expanded graphite sealing ring is filled between the matching surface of the conical expansion structure of the roasting tube 12 and the outer conical surface of the condenser tube 22. The expanded graphite sealing ring can compensate for the ovality error of the tube body, and it has oxidation resistance, a small mass loss rate in chlorinated gas, and effectively extends the service life of traditional rubber seals. The expanded graphite sealing ring maintains elastic sealing performance in a high-temperature chlorinated environment, and the self-compensation characteristics effectively fill the matching gap and build a multiple anti-leakage barrier.

[0044] The inner wall of the material transfer sleeve 31 is provided with a spiral guide groove with a groove depth of 2-3mm and a pitch of 1.2-1.5 times the pipe diameter. The spiral guide groove causes the material to generate a tangential velocity component, which effectively reduces the pipe wall adhesion phenomenon compared with a straight pipe. The spiral guide structure optimizes the material movement trajectory, and the surface modification layer is used to inhibit dust adhesion, thereby simultaneously achieving air tightness enhancement and pipe self-cleaning functions.

[0045] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “vertical” and “horizontal” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0046] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A quartz sand chlorination purification device, characterized in that: include: frame; A roasting system, comprising a roasting furnace arranged on the frame, and a roasting tube penetrating the roasting furnace, wherein the roasting tube is provided at a feed end with a feed inlet for the quartz sand to be purified to enter and an air intake port for suction through negative pressure; A condensation system, comprising a condensation furnace coaxially arranged with the roasting system, and a condensation pipe running through the condensation furnace, wherein the condensation pipe is provided with a discharge port for discharging purified quartz sand and a gas supply port for providing chlorination gas at a discharge end; A transition material transfer device, comprising a material transfer sleeve coaxially sleeved at the junction of the roasting tube and the condensing tube, the material transfer sleeve having a first annular flange with a clearance fit with the inner wall of the roasting tube, a second annular flange with an interference fit with the inner wall of the condensing tube, and a transition section connecting the first annular flange and the second annular flange; and The rotary drive mechanism is arranged at the junction of the roasting furnace and the condensing furnace, and is respectively connected to the roasting tube and the condensing tube through a transmission assembly; The calcining tube and the condensing tube are arranged at an inclined angle of 3°-8°, and the height of the feed port is higher than that of the discharge port, forming a continuous gradient material transfer channel.

2. The purification device according to claim 1, characterized in that The roasting tube and the condensing tube are both made of single crystal growth grade quartz tube, the purity of silicon dioxide is not less than 99.99%, and the tube wall thickness is 8-15mm; the inner surface of the material transfer sleeve is plated with a silicon nitride protective layer.

3. The purification device according to claim 2, characterized in that The roasting furnace comprises: A first heat-insulating layer, which is sleeved outside the roasting tube and has a first through hole reserved for the roasting tube to pass through horizontally; The heating device is arranged between the first heat-insulating layer and the roasting tube and is used for heating the roasting tube.

4. The purification device according to claim 3, characterized in that The condensing furnace comprises: A second heat-insulating layer, which is sleeved outside the condenser tube and has a second through hole reserved for the condenser tube to pass through horizontally; The condensing device is arranged between the second heat-insulating layer and the condensing tube and is used for cooling the condensing tube.

5. The purification device according to claim 4, characterized in that The heating equipment adopts a distributed multi-segment temperature control structure, including multiple groups of silicon carbide coated heating elements equidistantly arranged along the axial direction of the roasting tube, forming a temperature gradient of 50-80°C between adjacent intervals; the condensing equipment includes a two-stage condensing unit: the first stage is a spiral copper coil wrapped around the outer wall of the condensing tube, and a -15°C ethylene glycol solution is passed through it; the second stage is a semiconductor refrigeration plate group attached to the spiral copper coil.

6. The purification device according to claim 1, characterized in that The rotary drive mechanism comprises: A permanent magnet synchronous magnetic suspension direct drive motor, whose dual output shafts are connected to the roasting tube and the condensing tube respectively through a universal coupling; The photoelectric encoder installed in the coupling monitors the speed difference between the roasting tube and the condensing tube in real time, which is ≤0.5rpm.

7. The purification device according to claim 6, characterized in that The rotary drive mechanism also includes a planetary gear reducer with an output torque range of 80-120 N·m and a speed control accuracy of ±0.2 r / min; wherein the drive control system dynamically adjusts the speed ratio of the roasting tube and the condensing tube to 1:0.98-1.02 according to the material transmission speed.

8. The purification device according to claim 1, characterized in that The discharge end of the roasting tube forms a conical expansion structure, and the inner conical surface of the roasting tube and the outer conical surface of the feed end of the condensing tube form a clearance fit.

9. The purification device according to claim 8, characterized in that An expanded graphite sealing ring is filled between the matching surfaces of the conical expansion structure of the roasting tube and the outer conical surface of the condensing tube.

10. The purification device according to claim 1, characterized in that The inner wall of the material transfer sleeve is provided with a spiral guide groove with a groove depth of 2-3 mm and a pitch of 1.2-1.5 times the diameter of the material transfer sleeve.

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