High-temperature molten salt continuous conveying system and method for titanium sponge production

Abstract

The invention provides a high-temperature molten salt continuous conveying system and method for titanium sponge production, the system comprises a magnesium electrolytic cell, a titanium reduction and evaporation furnace, a liquid magnesium refining furnace and a molten salt transition furnace, the molten salt transition furnace is connected between the magnesium electrolytic cell and the titanium reduction and evaporation furnace, and / or is connected between the magnesium electrolytic cell and the liquid magnesium refining furnace, and the molten salt transition furnace is connected between the titanium reduction and evaporation furnace and the liquid magnesium refining furnace. The device is used for continuously receiving, storing and disposing molten salt. The problems of intermittency, high labor intensity, large heat loss and the like existing in traditional ladle conveying are solved, and continuous, efficient and safe conveying of the high-temperature molten salt is achieved.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical technology, and more particularly, to a high-temperature molten salt continuous conveying system and method for titanium sponge production. Background Art

[0002] In the production of titanium sponge by the Kroll process, titanium metal and magnesium chloride are prepared by the reaction of titanium tetrachloride and liquid magnesium. During the preparation process, the transportation of high-temperature molten salt (including magnesium chloride, liquid magnesium and refined magnesium) is one of the key links.

[0003] Currently, in the small-scale production of titanium sponge, the transportation of high-temperature molten salt is mainly carried out by ladle transportation. Ladle transportation has the advantages of high flexibility, simple equipment, strong adaptability, high safety and convenient maintenance, and is suitable for small-scale or intermittent production. However, in the large-scale (such as ten thousand tons) production of titanium sponge, the disadvantages of ladle transportation are obvious. Problems such as low transportation efficiency, high labor intensity, large heat loss, limited capacity and potential safety hazards are difficult to avoid. Therefore, there is an urgent need for an efficient transportation method to meet the requirements of large-scale titanium sponge production.

[0004] Chinese Patent CN107858532A discloses a production system and method for titanium sponge, which mainly includes: a titanium tetrachloride preparation system, a metallic magnesium preparation system and a titanium sponge preparation system. The titanium tetrachloride preparation system includes: a first pretreatment system, a reduction system, a chlorination system and a refining device connected in sequence; the metallic magnesium preparation system includes: a preparation system and a refining system connected; the titanium sponge preparation system includes: a reduction reaction system and a distillation and refining system. The refined magnesium is vaporized into refined magnesium vapor and then undergoes a reduction reaction with the refined titanium tetrachloride vapor to obtain crude titanium and magnesium chloride; the distillation and refining system is connected to the reduction reaction system, and the crude titanium is subjected to vacuum distillation to obtain refined titanium sponge. By adopting a regenerative gas heating method and a raw material gas-phase contact reaction method, problems such as long time consumption, intermittent production and low efficiency in the preparation of titanium sponge by the magnesium thermal reduction method are solved, the production cost of titanium sponge is effectively reduced, and the labor intensity is reduced. However, the system design is different from that of the present invention and cannot solve various problems existing in traditional ladle transportation. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature molten salt continuous conveying system and method for titanium sponge production based on a molten salt transfer furnace and a heating pipeline, so as to solve problems such as intermittency, high labor intensity and large heat loss existing in traditional ladle transportation, and realize continuous, efficient and safe transportation of high-temperature molten salt.

[0006] To achieve the above object, the present invention provides a high-temperature molten salt continuous conveying system and method for titanium sponge production. The technical solution of the present invention is realized as follows:

[0007] A high-temperature molten salt continuous conveying system for titanium sponge production, comprising a magnesium electrolysis cell, a titanium reduction and evaporation furnace, a liquid magnesium refining furnace, and a control system. The system further comprises a molten salt transition furnace, which is connected between the magnesium electrolysis cell and the titanium reduction and evaporation furnace, and / or connected between the magnesium electrolysis cell and the liquid magnesium refining furnace, for continuously receiving, storing, and disposing of molten salt.

[0008] Further, the molten salt transition furnace comprises a magnesium chloride transition furnace; the magnesium chloride transition furnace is connected to the titanium reduction and evaporation furnace and the magnesium electrolysis cell, for continuously receiving, storing, and disposing of magnesium chloride.

[0009] Further, the molten salt transition furnace further comprises a liquid magnesium transition furnace; the liquid magnesium transition furnace is connected to the magnesium electrolysis cell and the liquid magnesium refining furnace, for continuously receiving, storing, and disposing of liquid magnesium.

[0010] Further, the system further comprises a heating pipeline for conveying high-temperature molten salt, and the heating pipeline is connected to the magnesium electrolysis cell, the titanium reduction and evaporation furnace, the magnesium chloride transition furnace, the liquid magnesium transition furnace, and the liquid magnesium refining furnace.

[0011] Further, the heating pipeline comprises a first heating pipeline, a second heating pipeline, and a third heating pipeline; the first heating pipeline is connected to the magnesium electrolysis cell and the liquid magnesium transition furnace and between the liquid magnesium transition furnace and the liquid magnesium refining furnace, for conveying liquid magnesium; the second heating pipeline is connected to the liquid magnesium refining furnace and the titanium reduction and evaporation furnace, for conveying refined magnesium; the third heating pipeline is connected to the magnesium electrolysis cell and the magnesium chloride transition furnace and between the titanium reduction and evaporation furnace and the magnesium chloride transition furnace, for conveying magnesium chloride.

[0012] Further, the system further comprises a liquid level regulating device, which is arranged in the magnesium chloride transition furnace and / or the liquid magnesium transition furnace and / or the liquid magnesium refining furnace, for regulating the liquid level.

[0013] For the high-temperature molten salt continuous conveying system for titanium sponge production according to the claim, the magnesium chloride transition furnace is provided with a waste heat recovery device, and the excess heat is collected and reused by the waste heat recovery device.

[0014] Further, the magnesium chloride transition furnace, the liquid magnesium transition furnace, the liquid magnesium refining furnace, and the heating pipeline are all provided with heating devices to ensure that the molten salt flows in a liquid state.

[0015] Further, the liquid levels of each part of the system are in the order from high to low: titanium reduction and evaporation furnace, magnesium chloride transition furnace, magnesium electrolysis cell, liquid magnesium transition furnace, liquid magnesium refining furnace. This setting enables the molten salt to flow by itself relying on gravity, reducing energy consumption.

[0016] A method for producing titanium sponge using the above system, comprising the following steps:

[0017] S1: The magnesium chloride produced in the titanium reduction furnace flows into the magnesium chloride transfer furnace, and the temperature of the magnesium chloride is appropriately reduced and heated.

[0018] S2: The magnesium chloride that has been statically settled and cooled flows from the magnesium chloride transfer furnace into the magnesium electrolysis cell, and its addition amount is achieved through the interlock of the liquid level of the magnesium electrolysis cell and the regulating valve.

[0019] S3: The liquid magnesium produced in the magnesium electrolysis cell flows into the liquid magnesium transfer furnace, and the liquid magnesium is appropriately heated.

[0020] S4: The liquid magnesium that has been statically settled and heated flows from the liquid magnesium transfer furnace into the liquid magnesium refining furnace; after refining the liquid magnesium with a refining agent, the inlet valve of the liquid magnesium refining furnace is closed.

[0021] S5: The refined magnesium is sent into the titanium reduction furnace by means of gas pressurization to complete the production of titanium sponge.

[0022] Compared with the prior art, the high-temperature molten salt continuous conveying system and method for titanium sponge production according to the present invention have the following advantages:

[0023] 1. Continuous production: The continuous conveying of high-temperature molten salt is achieved through the molten salt transfer furnace and the heating pipeline, eliminating the intermittent problem of traditional ladle conveying and improving production efficiency.

[0024] 2. Reduced labor intensity: The automated conveying system reduces manual operation, reducing labor intensity and safety risks.

[0025] 3. Reduced heat loss: The heatable pipeline ensures that the molten salt remains at a high temperature during conveying, reducing heat loss and energy consumption.

[0026] 4. Reduced equipment wear: The continuous conveying system reduces the frequent operation of equipment, reducing equipment wear and maintenance costs.

[0027] 5. Improved safety: The sealed pipeline conveying system avoids the leakage and splashing of molten salt, improving production safety. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the high-temperature molten salt continuous conveying system according to Embodiment 1 of the present invention;

[0029] Figure 2 It is a flow chart of the material circulation conveying according to Embodiment 1 of the present invention.

[0030] Description of the Reference Numerals:

[0031] 1. Magnesium electrolysis cell; 2. Titanium reduction and evaporation furnace; 3. Magnesium chloride transfer furnace; 4. Liquid magnesium transfer furnace; 5. Liquid magnesium refining furnace; 6. Magnesium chloride packaging device; 21. Titanium reduction furnace; 31. First liquid level adjustment tank; 41. Second liquid level adjustment tank; 51. Third liquid level adjustment tank; 71. First heating pipeline; 72. Second heating pipeline; 73. Third heating pipeline. Detailed implementation mode

[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are some but not all of the embodiments of the present invention. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0033] The following specifically describes one embodiment of the present invention in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] A high-temperature molten salt continuous conveying system for titanium sponge production, comprising: a magnesium electrolysis cell 1, a titanium reduction and evaporation furnace 2, a molten salt transfer furnace, a liquid magnesium refining furnace 5, a heating pipeline and a control system. Among them, the molten salt transfer furnace is connected between the magnesium electrolysis cell 1 and the titanium reduction and evaporation furnace 2, and / or connected between the magnesium electrolysis cell 1 and the liquid magnesium refining furnace 5, and is used for continuously receiving, storing and disposing of molten salt; the molten salt transfer furnace includes at least one of a magnesium chloride transfer furnace 3 and a liquid magnesium transfer furnace 4. Preferably, the molten salt transfer furnace includes both a magnesium chloride transfer furnace 3 and a liquid magnesium transfer furnace 4 at the same time.

[0036] The magnesium electrolysis cell 1 uses electrolysis technology to decompose molten magnesium chloride into metallic magnesium and chlorine gas. Its function is to produce liquid magnesium.

[0037] The titanium reduction and evaporation furnace 2 converts titanium tetrachloride into metallic titanium through a high-temperature reduction reaction and separates unreacted substances and by-products through distillation. The titanium reduction and evaporation furnace 2 includes a titanium reduction furnace 21 and a distillation device. The function of the titanium reduction furnace 21 is a reaction vessel for the reaction of liquid magnesium and titanium tetrachloride to produce magnesium chloride and titanium products.

[0038] The magnesium chloride transfer furnace 3 is connected to the magnesium electrolysis cell 1 and the liquid magnesium refining furnace 5, and is used for continuously receiving, storing and disposing of liquid magnesium. On the one hand, the magnesium chloride transfer furnace 3 plays a bridging role, continuously receiving and storing the high-temperature magnesium chloride molten salt generated from the titanium reduction furnace 21 through a pipeline, and at the same time smoothly conveying it to the magnesium electrolysis cell 1; on the other hand, the magnesium chloride transfer furnace 3 has the functions of static impurity removal and waste heat recovery and utilization.

[0039] Specifically, the temperature of the magnesium chloride molten salt discharged from the titanium reduction furnace 21 is as high as 700-800°C, and contains impurities such as titanium particles and low-valent titanium compounds. If it is directly added to the magnesium electrolytic cell 1, it will cause two problems: excessive temperature and impurity interference. Excessive temperature will cause the magnesium electrolytic cell 1 to overheat and affect its normal operation. Multivalent titanium impurities will cause repeated ionization, significantly reducing the electrolysis efficiency of the magnesium electrolytic cell 1. Therefore, the magnesium chloride transition furnace 3 removes impurities by standing still, and uses the cooling process to recover waste heat to ensure that the magnesium chloride molten salt transported to the magnesium electrolytic cell 1 meets the process requirements, thereby ensuring the stability and efficiency of the entire production process.

[0040] The magnesium chloride transition furnace 3 comprises: a crucible 1, a heating furnace 1, a waste heat recovery device and a large cover 1.

[0041] Crucible 1 includes a reactor, a liquid level regulating tank 31, and an inner sleeve. The reactor is treated with corrosion protection; the liquid level regulating tank 31 is used to adjust the liquid level in the magnesium chloride transition furnace 3; and the inner sleeve is used to collect titanium slag. The crucible can hold 10 tons to 20 tons of magnesium chloride, is easy to disassemble, and is cleaned regularly according to the production cycle to prevent titanium slag from agglomerating and affecting the effective volume of the crucible.

[0042] The heating furnace 1 includes a furnace shell 1, a heat preservation module 1 and a heating device 1. The heating device 1 includes a modular electromagnetic heating device, which can reduce power consumption by 50% compared with a resistance heating furnace.

[0043] The waste heat recovery device includes a cooling fan, a cooling air duct, an induced draft fan and a heat exchange device, which are used to recover the heat generated when the high-temperature magnesium chloride is left to cool down, and collect it in the waste heat recovery main pipe and send it to the heat-using process.

[0044] The large cover is used to ensure sealing and reduce the absorption of moisture in the air by magnesium chloride and the heat loss of magnesium chloride.

[0045] In addition, in order to reduce energy consumption, the installation height of the magnesium chloride transition furnace 3 should be ensured to be lower than the titanium reduction furnace 21 and higher than the magnesium electrolytic cell 1, so that the liquid levels in each part are from high to low: titanium reduction furnace 21>magnesium chloride transition furnace 3>magnesium electrolytic cell 1, to ensure that magnesium chloride can flow by itself by gravity.

[0046] The liquid magnesium transition furnace 4 is connected to the magnesium electrolytic cell 1 and the liquid magnesium refining furnace 5, and is used to continuously receive, store and dispose of liquid magnesium. On the one hand, the liquid magnesium transition furnace 4 continuously receives and stores the liquid magnesium produced from the magnesium electrolytic cell 1 through a pipeline, and at the same time smoothly transports it to the liquid magnesium refining furnace 5; on the other hand, the liquid magnesium transition furnace 4 has the function of statically removing impurities from the liquid magnesium molten salt. Specifically, since the liquid magnesium produced from the magnesium electrolytic cell 1 contains impurities such as electrolytes and slag, directly adding it to the liquid magnesium refining furnace 5 or the titanium reduction furnace 21 will introduce impurities such as sodium, calcium, potassium, aluminum oxide, and silicon oxide, thereby seriously affecting the quality of sponge titanium.

[0047] The liquid magnesium transition furnace 4 includes: a second crucible, a second heating furnace, and a second large cover.

[0048] The second crucible includes a reactor, a second liquid level regulating tank 41, an electrolyte backflow pipeline, and a slag collection device. The reactor is treated by titanium infiltration; the second liquid level regulating tank 41 is used to adjust the liquid level in the liquid magnesium transition furnace 4; the electrolyte backflow pipeline is used to timely discharge the excess electrolyte to maintain the stability of the liquid level and composition in the electrolytic cell; the slag collection device is used to collect the slag. The crucible can hold 10 to 15 tons of liquid magnesium, is easy to disassemble, and is regularly cleaned according to the production cycle to avoid the accumulation of slag affecting the effective volume of the crucible.

[0049] The second heating furnace includes a second furnace shell, a second heat preservation module, and a second heating device. The second heating device includes a modular electromagnetic heating device.

[0050] The second large cover is used to ensure sealing, which can not only reduce the reaction of liquid magnesium with oxygen and nitrogen in the air to reduce the quality of liquid magnesium by means of argon filling protection, but also reduce the heat loss of magnesium and avoid the condensation of liquid magnesium.

[0051] In addition, in order to minimize energy consumption as much as possible, the installation height of the liquid magnesium transition furnace 4 should be lower than that of the magnesium electrolytic cell 1 and higher than that of the liquid magnesium refining furnace 5, so that the liquid levels in each part from high to low are: magnesium electrolytic cell 1 > liquid magnesium transition furnace 4 > liquid magnesium refining furnace 5, to ensure that magnesium chloride can flow by gravity.

[0052] The liquid magnesium refining furnace 5 is connected to the titanium reduction furnace 21 and the liquid magnesium transition furnace 4, and is used to continuously receive and store the liquid magnesium generated from the liquid magnesium transition furnace 4 through pipelines, and after refining the liquid magnesium, convey the refined magnesium to the titanium reduction furnace 21 through a heatable pipeline. The liquid magnesium refining furnace 5 mainly uses a refining agent to reduce the impurity content of iron, aluminum, etc. in the liquid magnesium to less than 0.01%, thus greatly improving the quality of sponge titanium.

[0053] The liquid magnesium refining furnace 5 includes a third crucible, a third heating furnace, a third large cover, a third liquid level regulating tank 51, a refining device, and a refining slag collection device.

[0054] The third liquid level regulating tank 51 is used to adjust the liquid level in the liquid magnesium refining furnace 5. The third heating furnace includes a third heating device.

[0055] The function of the refining device is to continuously add and disperse control the refining agent, so as to fully and evenly refine and remove impurities from the liquid magnesium in the refining furnace.

[0056] The function of the refining slag collection device is to maximize the recovery of valuable metals.

[0057] In addition, in order to minimize energy consumption and product quality as much as possible, the liquid magnesium transfer furnace 4 should have good sealing performance, and valves should be installed on the inlet and outlet pipelines to facilitate the transportation of refined magnesium to the titanium reduction furnace 21 by means of gas pressurization in the liquid magnesium refining furnace 5.

[0058] The heating pipelines are connected to the titanium reduction furnace 21, magnesium chloride transfer furnace 3, liquid magnesium transfer furnace 4, liquid magnesium refining furnace 5 and magnesium electrolytic cell 1. The pipelines are made of alloy materials or ceramic materials, and are equipped with resistance heating or electromagnetic heating devices on the outside to ensure that the molten salt is in a high-temperature and flowing state during transportation.

[0059] The heating pipelines include heating pipeline one 71, heating pipeline two 72 and heating pipeline three 73. The heating pipeline one 71 is connected to the magnesium electrolytic cell 1 and the liquid magnesium transfer furnace 4, as well as the liquid magnesium transfer furnace 4 and the liquid magnesium refining furnace 5 for transporting liquid magnesium; the heating pipeline two 72 is connected to the liquid magnesium refining furnace 5 and the titanium reduction evaporation furnace 2 for transporting refined magnesium; the heating pipeline three 73 is connected to the magnesium electrolytic cell 1 and the magnesium chloride transfer furnace 3, as well as the titanium reduction evaporation furnace 2 and the magnesium chloride transfer furnace 3 for transporting magnesium chloride. Appropriate temperatures are set according to the variety characteristics of the transported molten salt to ensure its high-temperature flowing state.

[0060] Furthermore, high-temperature valves are designed between the heating pipelines and the equipment to achieve the regulation of high-temperature molten salt.

[0061] The control system is used to monitor and regulate the temperature, flow rate and pressure of the titanium reduction furnace 21, magnesium chloride transfer furnace 3, liquid magnesium transfer furnace 4, liquid magnesium refining furnace 5, magnesium electrolytic cell 1 transfer furnace and heating pipelines to ensure the stability and continuity of the transportation process. The control system includes two important aspects: temperature control and automation control.

[0062] Temperature control: The heating devices in the heatable pipelines ensure that the molten salt remains in a high-temperature liquid state during transportation, avoiding solidification and heat loss.

[0063] Automation control: The control system monitors and regulates the transportation parameters in real time to ensure the continuous and stable operation of the entire system.

[0064] The high-temperature molten salt continuous transportation system described in the present invention includes a liquid level regulating device, and the liquid level regulating device is arranged in the magnesium chloride transfer furnace 3 and / or the liquid magnesium transfer furnace 4 and / or the liquid magnesium refining furnace 5. Preferably, as Figure 1 shown, liquid level regulating devices are provided in the magnesium chloride transfer furnace 3, the liquid magnesium transfer furnace 4 and the liquid magnesium refining furnace 5, which are liquid level regulating tank one 31, liquid level regulating tank two 41 and liquid level regulating tank three 51 respectively.

[0065] The high-temperature molten salt continuous transportation system described in the present invention further includes a magnesium chloride packaging device 6, and the magnesium chloride packaging device 6 is connected to the heating pipeline three 73. The magnesium chloride packaging device 6 is used to make products from the unconsumed magnesium chloride.

[0066] In the high-temperature molten salt continuous conveying system described in the present invention, the liquid levels of each part from high to low are: titanium reduction furnace 2, magnesium chloride transition furnace 3, magnesium electrolysis cell 1, liquid magnesium transition furnace 4, and liquid magnesium refining furnace 5. This setting enables the molten salt to flow by itself relying on gravity, reducing energy consumption. The adjustment of the liquid level is carried out through a liquid level adjustment device, that is, the first liquid level adjustment tank 31, the second liquid level adjustment tank 41, and the third liquid level adjustment tank 51 cooperate and operate in coordination.

[0067] A method for producing titanium sponge using the above system includes the following steps:

[0068] S1: Magnesium chloride is conveyed from the titanium reduction furnace 21 to the magnesium chloride transition furnace 3.

[0069] The magnesium chloride produced in the titanium reduction furnace 21 enters the main pipe of the third heating pipe 73 through the magnesium chloride discharge pipe in the titanium reduction furnace 21 and flows to the magnesium chloride transition furnace 3. During the process of magnesium chloride flowing in, the first liquid level adjustment tank 31 inflates and deflates under the guidance of the control system to ensure that the horizontal liquid level height in the magnesium chloride transition furnace 3 is between the titanium reduction furnace 21 and the magnesium electrolysis cell 1, avoiding the backflow of molten salt caused by changes in the height difference.

[0070] The temperature - fan - heating interlock in the magnesium chloride transition furnace 3 cools down and heats up in a timely manner under the temperature control of the control system to ensure that the temperature in the magnesium chloride transition furnace 3 is between 655°C and 670°C, and the excess heat is collected and reused by the waste heat recovery device.

[0071] S2: Magnesium chloride is conveyed from the magnesium chloride transition furnace 3 to the magnesium electrolysis cell 1.

[0072] The magnesium chloride that has been statically settled and cooled is added into the magnesium electrolysis cell 1 through the main pipe of the third heating pipe 73, and its addition amount is achieved through the interlock of the liquid level in the magnesium electrolysis cell 1 and the regulating valve on the branch pipe of the third heating pipe 73.

[0073] The magnesium chloride that cannot be consumed is packed by the magnesium chloride packaging device 6 at the end of the main pipe of the third heating pipe 73 and sold externally.

[0074] S3: Liquid magnesium is conveyed from the magnesium electrolysis cell 1 to the liquid magnesium transition furnace 4.

[0075] The liquid magnesium produced in the magnesium electrolysis cell 1 enters the main pipe of the first heating pipe 71 through the magnesium discharge pipe in the magnesium electrolysis cell 1 and flows to the liquid magnesium transition furnace 4 under the top discharge action of the liquid under - tank in the magnesium electrolysis cell 1 through the branch pipes of the first heating pipe 71. During the process of liquid magnesium flowing in, the second liquid level adjustment tank 41 inflates and deflates under the guidance of the control system to ensure that the horizontal liquid level height in the liquid magnesium transition furnace 4 is between the magnesium electrolysis cell 1 and the liquid magnesium refining furnace 5, avoiding the backflow of liquid magnesium caused by changes in the height difference.

[0076] Under the action of the temperature control system in the control system, the temperature-heating interlock in the liquid magnesium is heated in a timely manner to ensure that the temperature in the liquid magnesium transfer furnace 4 is between 710°C and 720°C.

[0077] S4: The liquid magnesium is transported from the liquid magnesium transfer furnace 4 to the liquid magnesium refining furnace 5.

[0078] The liquid magnesium that has been statically settled and heated is sent into the liquid magnesium refining furnace 5 through the heating pipeline 71 main pipe. The content of impurities such as iron and aluminum in the liquid magnesium is reduced to less than 0.01% by using a refining agent. After being refined by the refining agent, the inlet valve of the liquid magnesium refining furnace 5 is closed.

[0079] S5: The refined magnesium is transported from the liquid magnesium refining furnace 5 to the titanium reduction furnace 21.

[0080] The refined magnesium is sent into the titanium reduction furnace 21 through the heating pipeline 72 by means of gas pressurization to complete the production of sponge titanium.

[0081] In addition, under certain conditions, the transportation of magnesium chloride from the titanium reduction furnace 21 to the magnesium chloride transfer furnace 3 and the transportation of liquid magnesium from the liquid magnesium refining furnace 5 to the titanium reduction furnace 21 can be carried out in batches by using a ladle.

[0082] In actual operation, the cleaning cycles of the magnesium chloride transfer furnace 3, the liquid magnesium transfer furnace 4, and the liquid magnesium refining furnace 5 are greatly affected by the production process and vary in different periods. Therefore, it is necessary to regularly measure the slag volume in the furnace. When the effective volume is affected, it is necessary to stop the furnace for switching and cleaning.

[0083] It should be noted that all the terms indicating direction and position in the present invention, such as: "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "inside", "outside", "top", "bottom", "tail end", "head end", "center", etc., are only used to explain the relative position relationship and connection situation between components in a certain specific state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes Scheme A, or Scheme B, or the scheme where both A and B are satisfied simultaneously.

[0084] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A high-temperature molten salt continuous conveying system for titanium sponge production, comprising a magnesium electrolysis cell (1), a titanium reduction and evaporation furnace (2) and a liquid magnesium refining furnace (5), characterized in that, The system further includes a molten salt transfer furnace, which is connected between the magnesium electrolysis cell (1) and the titanium reduction and distillation furnace (2), and / or connected between the magnesium electrolysis cell (1) and the liquid magnesium refining furnace (5) for continuously receiving, storing and disposing of molten salt.

2. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 1, wherein, The molten salt transfer furnace includes a magnesium chloride transfer furnace (3); the magnesium chloride transfer furnace (3) is connected to the titanium reduction and distillation furnace (2) and the magnesium electrolysis cell (1) for continuously receiving, storing and disposing of magnesium chloride.

3. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 2, wherein, The molten salt transfer furnace further includes a liquid magnesium transfer furnace (4); the liquid magnesium transfer furnace (4) is connected to the magnesium electrolysis cell (1) and the liquid magnesium refining furnace (5) for continuously receiving, storing and disposing of liquid magnesium.

4. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 3, characterized in that, The system further includes a heating pipeline for transporting high-temperature molten salt, and the heating pipeline is connected to the magnesium electrolysis cell (1), the titanium reduction and distillation furnace (2), the magnesium chloride transfer furnace (3), the liquid magnesium transfer furnace (4) and the liquid magnesium refining furnace (5).

5. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 4, wherein, The heating pipeline includes a first heating pipeline (71), a second heating pipeline (72) and a third heating pipeline (73); the first heating pipeline (71) is connected to the magnesium electrolysis cell (1) and the liquid magnesium transfer furnace (4) and between the liquid magnesium transfer furnace (4) and the liquid magnesium refining furnace (5) for transporting liquid magnesium; the second heating pipeline (72) is connected to the liquid magnesium refining furnace (5) and the titanium reduction and distillation furnace (2) for transporting refined magnesium; the third heating pipeline (73) is connected to the magnesium electrolysis cell (1) and the magnesium chloride transfer furnace (3) and between the titanium reduction and distillation furnace (2) and the magnesium chloride transfer furnace (3) for transporting magnesium chloride.

6. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 3, wherein, The system further includes a liquid level regulating device, which is arranged in the magnesium chloride transfer furnace (3) and / or the liquid magnesium transfer furnace (4) and / or the liquid magnesium refining furnace (5).

7. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 3, wherein The magnesium chloride transfer furnace (3) is provided with a waste heat recovery device.

8. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 3, wherein The magnesium chloride transfer furnace (3), the liquid magnesium transfer furnace (4), the liquid magnesium refining furnace (5) and the heating pipeline are all provided with heating devices to ensure that the molten salt flows in a liquid state.

9. The high-temperature molten salt continuous conveying system for titanium sponge production according to claim 3, wherein The liquid levels of each part of the system are in the order from high to low: the titanium reduction and distillation furnace (2), the magnesium chloride transfer furnace (3), the magnesium electrolysis cell (1), the liquid magnesium transfer furnace (4), the liquid magnesium refining furnace (5).

10. A method for producing titanium sponge using the system according to any one of claims 3-9, characterized in that, Comprising the following steps: S1: The magnesium chloride produced in the titanium reduction and distillation furnace (2) flows into the magnesium chloride transfer furnace (3), and the temperature of the magnesium chloride is appropriately reduced and heated. S2: The magnesium chloride that has been statically settled and cooled flows from the magnesium chloride transfer furnace (3) into the magnesium electrolysis cell (1), and its addition amount is realized through the interlock of the liquid level of the magnesium electrolysis cell (1) and the regulating valve. S3: The liquid magnesium produced in the magnesium electrolysis cell (1) flows into the liquid magnesium transfer furnace (4), and the temperature of the liquid magnesium is appropriately heated. S4: The liquid magnesium that has been statically settled and heated flows from the liquid magnesium transfer furnace (4) into the liquid magnesium refining furnace (5); after the liquid magnesium is refined by using a refining agent, the inlet valve of the liquid magnesium refining furnace (5) is closed. S5: The refined magnesium is sent into the titanium reduction and distillation furnace (2) by means of gas pressurization to complete the production of sponge titanium.

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