Continuous in-situ preparation method of alloy melt containing elements easy to oxidize or segregate

Abstract

The invention discloses a continuous in-situ preparation method of an alloy melt containing elements easy to oxidize or segregate, which comprises the following steps: smelting other alloy components except the elements easy to oxidize or segregate to obtain an initial alloy melt; the method comprises the following steps: continuously feeding a wire containing easy-to-oxidize or easy-to-segregate elements and refining gas into an initial alloy melt in a wire-gas parallel feeding manner, and melting the wire containing easy-to-oxidize or easy-to-segregate elements by the continuously flowing high-temperature initial alloy melt under the protection and stirring action of the refining gas to form an alloy melt containing easy-to-oxidize or easy-to-segregate elements in situ; and hydrogen in the melt is removed by refining gas, so that gas refining is synchronously realized. In the preparation process of the lithium-containing alloy, floating of lithium can be reduced, the uniformity of lithium components is improved, the problems of lithium oxidation and hydrogen absorption are reduced, and efficient and continuous preparation of the lithium-containing melt is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium-containing alloy smelting and metallurgy, and in particular to a method for continuously preparing an alloy melt containing easily oxidizable or easily segregated elements in situ. Background Art

[0002] When preparing alloy melts containing easily oxidized or easily segregated elements, problems such as oxidation, hydrogen absorption, and element segregation can greatly affect the smelting and casting quality of the alloy, especially when smelting lithium-containing alloys.

[0003] Lithium and its compounds have a series of excellent physical and chemical properties. Lithium is widely used in glass ceramics, petrochemicals, metallurgy, textiles, synthetic rubber, lubricating materials, medical treatment, nuclear power generation and other fields. Among them, Al-Li alloys and Mg-Li lithium alloys have wide applications and broad application prospects in the fields of aerospace and defense industries. Aluminum-lithium alloys are considered to be one of the most promising aerospace structural metal materials in the 21st century. They have the advantages of low density, high strength, high elastic modulus and good corrosion resistance. In recent years, with the development of the aerospace and transportation industries, the demand for lightweight equipment construction has become more urgent, and aluminum-lithium alloys have also received more and more attention. However, since the density of lithium is much smaller than that of aluminum, only 0.534g / cm3, which is 1 / 5 of that of aluminum, during the alloy smelting process, lithium is easy to float in aluminum melt or other matrix melt, resulting in uneven distribution of lithium in the alloy. At the same time, the lithium element is very active, and oxygen and water vapor in the air can react, resulting in problems such as oxidation and hydrogen absorption. Traditional smelting and casting processes have many steps and long production time, which will further aggravate the problems of lithium floating, oxidation and hydrogen absorption.

[0004] In response to the above problems, CN221666603U has disclosed an aluminum-lithium vacuum melting device, and CN118639038A has disclosed a composite purification method for aluminum-lithium alloy melt and a method for preparing aluminum-lithium alloy ingots. Although the above patents have reduced the problems of lithium oxidation and hydrogen absorption to a certain extent, and improved the melt purity and alloy quality. However, the following problems still exist. Vacuum melting has high requirements for equipment, high costs, and relatively harsh production conditions; the method for purifying aluminum-lithium alloys, the process flow, and the operating steps are cumbersome, and there are many additional processes and low production efficiency. At the same time, the above two methods cannot achieve efficient and continuous preparation of aluminum-lithium alloys. In addition, patent CN118256782A discloses a gas in-situ self-generated aluminum-lithium alloy and its preparation method, which generates a lithium nitride second phase through a nitrogen in-situ self-generated method to improve the mechanical properties of aluminum-lithium alloys. However, its production process is complex and the production efficiency is low.

[0005] In addition, there is an off-furnace refining technology in the field of alloy smelting, that is, various additives (such as deoxidizers, desulfurizers, modifiers, alloys, etc.) are crushed into a certain particle size and wrapped with a thin steel strip to make a cored wire, or the alloy is directly processed into wire, and it is fed into the appropriate depth in the molten steel through the slag layer on the top of the ladle by a wire feeder, and interacts with the molten steel as it continues to melt, and performs deoxidation, desulfurization, micro-alloying, composition fine-tuning, and modification. Adjustment operations such as treatment. Since the lithium content in lithium-containing alloys is usually low, the applicant considers that a similar method can be adopted. When casting and smelting lithium-containing alloys, the smelting of other alloy matrices is completed first, and then before casting, a similar wire feeding method is used to finally add components containing easily oxidized or easily segregated elements (such as lithium), which can better avoid process defects caused by the floating of lithium components in the alloy. Summary of the invention

[0006] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide a continuous in-situ preparation method for alloy melts containing easily oxidized or easily segregated elements, which can reduce the segregation of easily oxidized or easily segregated elements, improve the uniformity of alloy composition, reduce the oxidation and hydrogen absorption problems of the alloy, and realize efficient and continuous preparation of the alloy melt.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for continuously preparing an alloy melt containing easily oxidizable or easily segregated elements in situ, wherein the method comprises first completing the smelting of other alloy components except the easily oxidizable or easily segregated elements to obtain an initial alloy melt, and is characterized in that before casting, wires containing easily oxidizable or easily segregated elements and refining gas are continuously fed into the initial alloy melt in a wire-gas feeding manner, the wires containing easily oxidizable or easily segregated elements are melted by the continuously flowing high-temperature initial alloy melt under the protection and stirring of the refining gas, an alloy melt containing easily oxidizable or easily segregated elements is formed in situ, and gas refining is simultaneously achieved by removing hydrogen from the melt by the refining gas.

[0008] In this way, when casting and melting alloys containing easily oxidized or easily segregated elements, this solution first completes the melting of other alloy matrices, and then uses a similar wire feeding method to finally add components containing easily oxidized or easily segregated elements (such as lithium) and refining gas before casting. While the wire is melted, the refining gas is used to simultaneously achieve uniform stirring and dehydrogenation refining. The escaping refining gas gathers on the surface of the melt to protect the melt. The processed melt is directly sent to the casting equipment to complete the casting. Therefore, the floating and precipitation of easily oxidized or easily segregated elements (lithium) are avoided, the uniformity of the alloy composition is improved, the oxidation and hydrogen absorption problems of the alloy are reduced, and the efficient and continuous preparation of the alloy melt is achieved. It can be used for continuous casting and rolling, continuous casting or semi-continuous casting of alloys containing easily oxidized or easily segregated elements (lithium).

[0009] Furthermore, the easily oxidizable or easily segregated element is lithium, the alloy containing the easily oxidizable or easily segregated element is a lithium-containing alloy, and the wire containing the easily oxidizable or easily segregated element is a lithium-containing wire.

[0010] Furthermore, the lithium content in the lithium-containing alloy is lower than 50 w%, and the optimal content range is 5-15 w%.

[0011] Lithium-containing alloys with a content ratio higher than this are no longer suitable for preparation by this method.

[0012] Furthermore, the refining gas is argon, which can better achieve protection and gas refining.

[0013] Furthermore, the lithium-containing wire enters a region below 1 / 2 of the depth of the initial alloy melt.

[0014] In this way, the lithium-containing wire enters the bottom layer of the initial alloy melt, which can ensure a more uniform distribution of lithium and reduce the problem of uneven distribution caused by lithium floating.

[0015] Furthermore, the diameter of the lithium-containing wire is 1.2-4 mm, the wire feeding speed of the lithium-containing wire is 1.5-15 m / min, the initial alloy melt depth at the lithium-containing wire feeding position is 170-220 mm, the width is 200 mm, and the refining gas flow rate is 5-25 L / min.

[0016] This parameter range can effectively ensure the mixing effect and smelting effect, and can better ensure the protection effect of lithium.

[0017] Furthermore, the method is implemented by a continuous forming device of alloy melt, which comprises a container made of high-temperature resistant material (high temperature refers to the temperature of smelting alloy), a liquid inlet is arranged above one end of the container, a liquid inlet tank is arranged correspondingly below the liquid inlet, the liquid inlet tank is connected forwardly to a forming cabin with a cabin cover, the forming cabin is connected forwardly to a liquid outlet tank which is closed as a whole, a liquid outlet channel is arranged below the liquid outlet tank, a wire gas and delivery pipe is also vertically arranged on the cabin cover of the forming cabin, the upper end of the wire gas and delivery pipe is exposed above the cabin cover and is sealed and connected upwardly with an air delivery pipe and a wire feeding pipe, both of which are connected with the inside of the wire gas and delivery pipe, the outer end of the air delivery pipe is used to be connected to a refining gas tank, the outer end of the wire feeding pipe is used to be connected to a wire feeding power mechanism, the lower end of the wire gas and delivery pipe is located in the middle and lower position inside the forming cabin, a wire outlet is arranged in the middle of the lower end of the wire gas and delivery pipe, and a plurality of air outlets are distributed around the wire outlet.

[0018] In this way, when the device is used, other alloy components except lithium are first melted and then enter the liquid inlet tank from the liquid inlet, and then enter the forming tank from the liquid inlet tank. Then, lithium is prepared as wire and sent from the wire feeding tube to the wire gas feeding tube and the wire is sent downward into the melt and melted therein. The melt flow rate and wire feeding speed are controlled according to the proportion of lithium elements. The refined gas sent in drives the smelted lithium elements to achieve stirring and dehydrogenation treatment, realize gas refining, and the refined gas floats from the melt to the surface of the melt to achieve atmosphere protection, so as to realize continuous in-situ aluminum-lithium alloy preparation. After mixing, the melt accumulates in the liquid outlet tank and directly flows out from the liquid outlet channel to realize casting. The defects caused by the floating and gathering of lithium and the problem of hydrogen absorption are reduced, and the casting quality is improved.

[0019] Furthermore, the entire container is made of crucible material, which is convenient for smelting.

[0020] Furthermore, a concave impact groove is provided on the bottom plate of the liquid inlet tank, directly below the liquid inlet, so as to buffer the incoming melt, obtain a suitable flow rate, and protect the tank body to a certain extent.

[0021] Furthermore, a slag discharge port is provided at the upper end of the liquid inlet of the liquid inlet tank which is away from the forming tank, so as to facilitate the discharge of slag on the surface of the molten liquid.

[0022] Furthermore, a slag retaining wall located above and a retaining dam located below are vertically arranged in sequence along the flow direction of the molten liquid in the liquid inlet tank, a liquid flow space is left between the slag retaining wall and the bottom plate of the liquid inlet tank below, the retaining dam is connected to the forming tank and leaves a liquid flow space between the slag retaining wall and the hatch cover plate above, one end of the hatch cover plate extends into the top of the liquid inlet tank and fixes the slag retaining wall at its end.

[0023] In this way, the slag retaining wall can be used to block the light slag on the upper layer of the molten liquid. At the same time, the retaining effect of the retaining dam makes the liquid inlet tank have a certain depth to ensure that the molten liquid entering the forming tank has sufficient temperature and fluidity, and ensure the effect of subsequent wire feeding and melting treatment. At the same time, the structural setting of the retaining dam and the slag retaining wall makes the liquid inlet tank form a semi-open, semi-closed, and semi-open structure, which is convenient for liquid entry and heat preservation of the molten liquid.

[0024] Furthermore, the outer surface of the lower end of the silk and gas delivery pipe is in the shape of a cone with a diameter increasing downward, and the inner cavity of the lower end of the silk and gas delivery pipe is in the shape of an inverted cone with a diameter decreasing downward at the cone, and a silk outlet is formed in the middle position of the inverted cone of the inner cavity, and the air outlet is inclined along the cone direction of the outer surface and is evenly distributed on the periphery of the silk outlet, and the upper port connected to the inner cavity of the silk and gas delivery pipe and the lower port connected to the forming cabin are staggered in the circumferential direction, and the staggered direction of each air outlet remains consistent along the circumferential direction.

[0025] In this way, the refining gas (argon) can be discharged along the cone shape to the outside and downward, which is convenient for the melted lithium liquid to flow around and form a spiral after the wire is discharged from the wire outlet, expanding the stirring range of the argon gas and the effect of driving the lithium liquid to mix with the initial alloy melt. Therefore, it is convenient for the refining gas and the melt to be fully mixed, so that some of the impurities such as hydrogen and oxygen in the melt are brought into the refining gas and removed together, realizing gas refining; and it can drive the lithium liquid to be fully mixed with the melt around to achieve smelting.

[0026] Furthermore, a stirring device is also provided in the forming chamber, so that a stirring and mixing effect can be further achieved.

[0027] Furthermore, a supporting top plate is spaced apart above the hatch cover plate, a heat-insulating insulation layer is formed between the supporting top plate and the hatch cover plate, and the silk-gas delivery pipe (and the stirring device) is supported and installed on the supporting top plate.

[0028] In this way, it is convenient to support and install the silk gas delivery pipe (and the stirring device), and it is also beneficial to form the insulation of the cabin.

[0029] Furthermore, an electric heating module is arranged outside the wire and gas delivery pipe, and the electric heating module is located in the heat-insulating layer, so as to facilitate preheating of the lithium wire and the refined gas, and better ensure that the melting temperature in the forming chamber is sufficient.

[0030] Furthermore, a liquid discharge retaining wall is provided at the liquid discharge end of the forming chamber to separate the liquid discharge chamber, a liquid discharge hole is provided at the lower end of the liquid discharge retaining wall to communicate with the liquid discharge chamber, and a liquid discharge gate is provided at the liquid discharge hole. This facilitates liquid discharge control, and when necessary, the liquid discharge gate can be switched on and off intermittently to extend the residence and stirring and mixing time of the molten liquid in the forming chamber, thereby increasing the stirring and mixing smelting effect.

[0031] Furthermore, a vertical fixed partition is arranged in the forming chamber along the flow direction of the molten liquid, and the fixed partition divides the forming chamber into a plurality of small chambers along the width direction. Each small chamber is provided with a silk gas delivery pipe (and a stirring device), and a liquid outlet hole is provided at the liquid outlet end of each small chamber, which is connected to the liquid outlet chamber.

[0032] In this way, when special circumstances require, such as when the alloy needs to contain multiple trace (or small) alloying elements and each trace (or small) alloying element needs to react with the basic alloy to generate different intermediates and avoid mutual reaction between trace (or small) elements, each small chamber can be used for independent wire feeding and smelting, and then the melt can be controlled to mix at a certain rate and proportion to obtain a more reasonable or required specific proportion of components, and finally better control and improve the performance of the casting alloy. In addition, for example, if it is necessary to prepare an alloy containing multiple primary phases at the same time, each small chamber can be used for wire feeding and smelting at different rates to obtain an alloy melt with different components, and then cooled to a certain temperature to obtain a solid-liquid two-phase melt (including a primary precipitation phase and a liquid phase), and then the melt is controlled to mix at a certain rate and proportion to obtain an alloy melt with two different primary phases at the same time, and then an alloy containing two different primary phases at the same time is obtained, which can effectively regulate the structure and properties of the casting alloy. When this control requirement is not required, using multiple small chambers to feed and mix the same metal wire separately can also improve the mixing and stirring effect of the metal wire and the basic melt after feeding, and improve the smelting effect. When the amount of alloy melt to be prepared is small, only one small chamber may be activated to prepare the alloy melt of a certain required composition in a single thread.

[0033] Furthermore, the hatch cover extends into the top of the liquid discharge tank and leaves a hole for controlling the up and down movement of the liquid discharge gate plate. In this way, it is convenient to keep the liquid discharge tank warm and avoid air intrusion.

[0034] Furthermore, the bottom plate of the liquid outlet tank is arranged lower than the bottom plate of the forming tank, and a diversion slope is arranged on the side adjacent to the forming tank and connected with the liquid outlet hole of the forming tank.

[0035] In this way, after the liquid is discharged from the liquid discharge chamber, it falls down along the guide slope into the liquid discharge chamber, which facilitates further sufficient mixing of the molten liquid during the falling process (especially when each small chamber is fed with wire for smelting separately).

[0036] Furthermore, the upper surface of the guide slope is upwardly protruding and provided with two groups of guide plates arranged in an X-staggered array, and each guide plate is vacant at the intersection point.

[0037] In this way, after the liquid is discharged from the liquid outlet holes of each small chamber, it will flow downward along the X-staggered guide plates. Since the guide plates are left vacant at the intersection points, the molten liquid can be diverted to both sides again after flowing through the intersection points. In this way, the molten liquid is continuously bifurcated and reorganized during the flow process to achieve full mixing, which greatly improves the further full mixing of the molten liquid after the wire is fed into each small chamber (especially when the wire is fed and smelted separately in each small chamber).

[0038] Furthermore, a corresponding plug is provided at the upper port of the liquid outlet channel, and a vertical rod is fixedly provided upward on the plug, which can slide up and down through the hatch cover and is connected to a horizontally arranged control lever, and the fulcrum of the control lever is hinged at the upper end of the liquid outlet side of the liquid outlet tank. In this way, the outflow speed of the mixed alloy melt can be controlled by operating the plug with the control lever, and the flow rate can be flexibly adjusted according to production needs. Reducing the melt outflow speed can extend the mixing time between the components and improve the melt uniformity, and increasing the melt outflow speed can improve production efficiency. It is convenient to realize liquid outflow control.

[0039] As a preferred embodiment, the stirring device comprises a stirring blade arranged in the forming chamber, the stirring blade is mounted on a vertically arranged stirring shaft, the upper end of the stirring shaft is mounted on a supporting top plate and connected to a stirring motor. This has a simple structure, mature technology and is easy to implement.

[0040] As another option, the stirring device is a pumping stirring device, which includes two vertically arranged pumping pipes, which are made of high-temperature resistant materials (high temperature refers to the temperature of smelting alloys), and are symmetrically arranged on both sides of the silk gas delivery pipe. A pumping port is provided at the lower end of the pumping pipe, and a pumping pressure control device is connected to the upper end of the pumping pipe.

[0041] In this way, the melt is continuously pumped in and out by two extraction pipes, fully achieving mixing and stirring of the solution. Compared with the stirring method using stirring blades, it can better prevent the blades from stirring to create gaps in the melt and affect the quality of the melt.

[0042] Furthermore, the extraction and pressure control device includes an extraction pipe and an injection pipe, one end of which is connected to the upper end of the extraction and injection pipe, the other end of the injection pipe is connected to a compressed gas tank after an injection electric-controlled valve and a pressure gauge are arranged in series, and the other end of the extraction pipe is connected to an extraction electric-controlled valve and an extraction pump in series. The injection electric-controlled valve, the pressure gauge, the extraction electric-controlled valve and the extraction pump are respectively connected to a control center. A control module is arranged in the control center for realizing the opening and closing of the injection electric-controlled valve of the compressed gas tank and the switching control of the extraction electric-controlled valve and the extraction pump.

[0043] In this way, when the compressed gas tank's gas injection electric control valve is closed, the gas extraction electric control valve and the gas extraction pump are opened, so that the gas injection pipe stops working and the gas extraction pipe extracts gas from the extraction pipe to form a negative pressure, so that the molten liquid is sucked into the extraction pipe from the extraction port; then the compressed gas tank's gas injection electric control valve is switched to open, and the gas extraction electric control valve and / or the gas extraction pump are controlled to close at the same time, so that the gas extraction pipe stops working and the gas injection pipe injects gas into the extraction pipe to form a positive pressure, so that the molten liquid in the extraction pipe is pressed out from the extraction port back into the molten liquid pool. This repeated cycle switching is used to control the extraction action of the extraction pipe, so that the molten liquid is repeatedly sucked into the extraction pipe and injected, achieving a mixing and stirring effect on the solution.

[0044] Furthermore, a timing control program is also provided in the control module of the control center, and the timing control program is used to control the pumping tubes on both sides to perform pumping actions synchronously for several rounds, and then control the pumping tubes on both sides to perform pumping actions alternately for several rounds and repeat this cycle.

[0045] In this way, since the injection port of the injection pipe is set downward, in the process of the injection pipes on both sides performing the injection action synchronously, when sucking the molten liquid, the lower layer of the molten liquid can be sucked into the injection pipe by rapid suction, and the upper layer of the molten liquid can be stopped when it drops to the vicinity of the injection port; then, when the molten liquid in the injection pipe is pressed back, the molten liquid can be slowly injected to make it flow back to the top of the molten pool, so as to realize the up and down exchange flow of the molten liquid in the molten pool. Then, in the process of the injection pipes on both sides performing the injection action alternately, when the injection pipe on one side sucks the solution, the injection pipe on the other side correspondingly presses out the molten liquid, so as to realize the repeated flow of the molten liquid in the horizontal direction in the molten pool. Therefore, this control method can realize the repeated exchange flow control of the molten liquid in the vertical and horizontal directions successively, greatly improving the stirring control effect of the molten liquid, and overcoming the defects of the blade stirring method that easily leads to uneven stirring and the generation of gaps in the molten liquid.

[0046] Furthermore, the gas in the compressed gas tank is refined gas (argon), so as to better achieve gas protection.

[0047] Furthermore, during the process of controlling the extraction and injection of the extraction and injection tube by the control module, the volume of the suction is smaller than the volume of the pressure injection.

[0048] This way, the injection volume is larger, which can better press out the molten metal sucked into the injection pipe during suction, avoiding the molten metal from adhering to the inner wall of the injection pipe. At the same time, part of the refined gas can be directly pressed into the molten pool during injection, further improving the dehydrogenation effect of gas refining while stirring and mixing.

[0049] Furthermore, a lifting control mechanism is also provided at the upper end of each extraction tube and connected thereto.

[0050] In this way, by controlling the lifting and lowering of the pumping tube, the exchange and stirring effect of the upper and lower layer solutions in the solution pool can be better assisted.

[0051] Furthermore, the lifting control mechanism is installed on the upper surface of the supporting top plate, and the pumping pipe can slide up and down through the hatch cover plate and the supporting top plate and is connected to the lifting mechanism, so that installation and control are conveniently realized.

[0052] Furthermore, the lifting mechanism includes a telescopic electric cylinder arranged vertically, the telescopic head of the telescopic electric cylinder is fixed to the pumping pipe through a horizontal connecting beam, and the motor of the telescopic electric cylinder is connected to the control center, so that installation and control are conveniently realized.

[0053] Furthermore, an ultrasonic level detector facing downward is installed on the outer wall of the injection tube and the upper end of the inner cavity wall, and the ultrasonic level detector is connected to the control center. In this way, the liquid level inside and outside the injection tube can be monitored in real time, which can better assist in achieving control.

[0054] Furthermore, the outer wall of the pumping tube is also provided with an electric heating device, so as to conveniently realize the warming heating inside the pumping tube.

[0055] In this way, the technical solution provided by the present invention combines the wire-gas delivery technology of continuous argon protection to deliver lithium during continuous casting and rolling, continuous casting or semi-continuous casting, directly delivers the lithium-containing wire into the bottom of the initial alloy melt and continuously forms an alloy melt containing easily oxidized or easily segregated elements in situ, and the argon gas delivered to the bottom of the melt can remove hydrogen from the melt and simultaneously realize gas refining, which can be used for continuous casting of lithium-containing alloys such as magnesium-lithium alloys and aluminum-lithium alloys. In addition, during the process of pumping the melt, the upper melt and the lower melt are replaced, and flow stirring is generated, and the molten lithium will be evenly distributed to all parts of the cabin with the flowing melt. Therefore, the present invention has the following advantages: 1. Adding lithium directly to the bottom of the melt can effectively reduce the problem of uneven distribution of lithium and convergence on the surface due to the floating of lithium. 2. The argon gas delivered with the lithium-containing wire will float to the surface of the melt to isolate the air, protect the melt, and effectively reduce the problems of oxidation and hydrogen absorption. 3. It fully utilizes the heat of the continuously flowing melt to melt the lithium-containing wire, and continuously forms an alloy melt containing easily oxidized or easily segregated elements in situ, which has higher production efficiency. At the same time, it reduces the existence time and process of the lithium-containing alloy melt, and avoids the serious problem of floating and aggregation caused by long-term placement after lithium is added. 4. Through the pumping device, the upper melt and the lower melt can be replaced to promote the uniform distribution of lithium. 5. A variety of lithium-containing alloy melts with different compositions can be prepared at the same time. 6. It is suitable for continuous melt preparation processes such as continuous casting and rolling, continuous casting and semi-continuous casting, with convenient preparation process and high production efficiency.

[0056] In summary, the present invention can reduce the floating of lithium, improve the uniformity of lithium components, reduce the oxidation and hydrogen absorption problems of lithium, and realize the efficient and continuous preparation of lithium-containing melts during the preparation of lithium-containing alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic cross-sectional structure diagram of the alloy melt continuous forming device used in Example 1 of the present invention.

[0058] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the separate accommodating body part.

[0059] Figure 3 for Figure 1 A cross-sectional view of the separate wire and gas delivery tube and its internal structure.

[0060] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure of the separate wire gas delivery pipe body.

[0061] Figure 5 for Figure 1 Schematic diagram of the planar structure of the separate guide slope and the guide plate above it.

[0062] Figure 6 It is a schematic cross-sectional structure diagram of the alloy melt continuous forming device used in Example 2 of the present invention.

[0063] Figure 7 It is a schematic cross-sectional structure diagram of the alloy melt continuous forming device used in Example 3 of the present invention.

[0064] Figure 8 This is a schematic diagram of the structure of the pumping stirring device used in Example 3 of the present invention. DETAILED DESCRIPTION

[0065] The present invention is further described in detail below in conjunction with specific implementation modes.

[0066] Embodiment 1: A method for continuously preparing an alloy melt containing easily oxidized or easily segregated elements in situ, which comprises first smelting the alloy components other than the easily oxidized or easily segregated elements to obtain an initial alloy melt, and is characterized in that before casting, wires containing easily oxidized or easily segregated elements and refining gas are continuously fed into the initial alloy melt in a wire-gas simultaneous feeding manner, and under the protection and stirring action of the refining gas, the wires containing easily oxidized or easily segregated elements are melted by the continuously flowing high-temperature initial alloy melt, forming an alloy melt containing easily oxidized or easily segregated elements in situ, and gas refining is simultaneously achieved by removing hydrogen from the melt with the refining gas.

[0067] In this way, when casting and melting alloys containing easily oxidized or easily segregated elements, this solution first completes the melting of other alloy matrices, and then uses a similar wire feeding method to finally add components containing easily oxidized or easily segregated elements (such as lithium) and refining gas before casting. While the wire is melted, the refining gas is used to simultaneously achieve uniform stirring and dehydrogenation refining. The escaping refining gas gathers on the surface of the melt to protect the melt. The processed melt is directly sent to the casting equipment to complete the casting. Therefore, the floating and precipitation of easily oxidized or easily segregated elements (lithium) are avoided, the uniformity of the alloy composition is improved, the oxidation and hydrogen absorption problems of the alloy are reduced, and the efficient and continuous preparation of the alloy melt is achieved. It can be used for continuous casting and rolling, continuous casting or semi-continuous casting of alloys containing easily oxidized or easily segregated elements (lithium).

[0068] In this embodiment, the easily oxidized or easily segregated element is lithium, the alloy containing the easily oxidized or easily segregated element is a lithium-containing alloy, and the wire containing the easily oxidized or easily segregated element is a lithium-containing wire. However, this method is not only applicable to the continuous addition of lithium elements to the initial alloy melt to achieve the continuous preparation of alloys with a certain composition, but also applicable to the continuous addition of other elements that are active, easily oxidized and / or prone to specific gravity macroscopic segregation (such as active rare earths such as Sc, Y or metals such as Zn) to the initial alloy melt to achieve the continuous preparation of alloys with a certain composition.

[0069] The lithium content of the lithium-containing alloy is less than 50 w%, and the optimal content range is 5-15 w%.

[0070] Lithium-containing alloys with a content ratio higher than this are no longer suitable for preparation by this method.

[0071] Among them, the refining gas is argon, which can better achieve protection and gas refining.

[0072] Among them, the lithium-containing wire enters the area below 1 / 2 depth of the initial alloy melt.

[0073] In this way, the lithium-containing wire enters the bottom layer of the initial alloy melt, which can ensure a more uniform distribution of lithium and reduce the problem of uneven distribution caused by lithium floating.

[0074] The diameter of the lithium-containing wire is 1.2-4 mm, the wire feeding speed of the lithium-containing wire is 1.5-15 m / min, the initial alloy melt depth at the lithium-containing wire feeding position is 170-220 mm and the width is 200 mm, and the refining gas flow rate is 5-25 L / min.

[0075] This parameter range can effectively ensure the mixing effect and smelting effect, and can better ensure the protection effect of lithium.

[0076] In this embodiment 1, the method is implemented by a device for continuously forming alloy melt, see Figure 1-5As shown, the alloy melt continuous forming device comprises a container 1 made of high temperature resistant material (high temperature refers to the temperature of smelting alloy), a liquid inlet 2 is arranged above one end of the container 1, a liquid inlet cabin 3 is arranged correspondingly below the liquid inlet 2, the liquid inlet cabin 3 is connected forwardly to a forming cabin 5 with a cabin cover 4, the forming cabin 5 is connected forwardly to a liquid outlet cabin 6 which is closed as a whole, a liquid outlet channel 7 is arranged below the liquid outlet cabin 6, a wire gas delivery pipe 8 is also arranged vertically on the cabin cover 4 of the forming cabin, and the upper end of the wire gas delivery pipe 8 is An air supply pipe 9 and a wire feeding pipe 10 are exposed above the cabin cover and sealed upwardly. The air supply pipe 9 and the wire feeding pipe 10 are both connected to the inside of the wire and gas feeding pipe and the connection is sealed with sealing materials. The outer end of the air supply pipe 9 is used to be connected to a refining gas tank (not shown in the figure), and the outer end of the wire feeding pipe 10 is used to be connected to a wire feeding power mechanism (not shown in the figure). The lower end of the wire and gas feeding pipe 8 is located in the middle and lower position inside the forming cabin 5. A wire outlet 11 is provided in the middle of the lower end of the wire and gas feeding pipe 8, and a plurality of air outlets 12 are distributed around the wire outlet 11.

[0077] In this way, when the device is used, other alloy components except lithium are first melted and then enter the liquid inlet tank from the liquid inlet, and then enter the forming tank from the liquid inlet tank, and then lithium is prepared as wire material and sent from the wire feeding tube to the wire gas feeding tube and the wire is sent downward into the melt and melted into it, and the melt flow rate and wire feeding speed are controlled according to the proportion of lithium element, and the smelted lithium element is driven by the sent in refined gas to achieve stirring and dehydrogenation treatment, and gas refining is achieved. The refined gas floats from the melt to the surface of the melt to achieve atmosphere protection, and continuous in-situ aluminum-lithium alloy preparation is achieved. After mixing, the melt accumulates in the liquid outlet tank and directly flows out from the liquid outlet channel to achieve casting. The defects caused by the floating stratification and hydrogen absorption of lithium are reduced, and the casting quality is improved.

[0078] The entire container 1 is made of crucible material, which is convenient for smelting.

[0079] Among them, a concave impact groove 13 is provided on the bottom plate of the liquid inlet cabin 3, just below the liquid inlet. The incoming melt can be buffered to obtain a suitable flow rate, and the cabin body can be protected to a certain extent.

[0080] A slag discharge port 14 is provided at the upper end of the liquid inlet port 2 of the liquid inlet tank away from the forming tank, so as to facilitate the discharge of slag on the surface of the molten liquid.

[0081] Among them, a slag retaining wall 15 located above and a retaining dam 16 located below are vertically arranged in sequence along the flow direction of the molten liquid in the liquid inlet tank 3, a liquid flow space is left between the slag retaining wall 15 and the bottom plate of the liquid inlet tank below, the retaining dam 16 is connected to form a tank and leaves a liquid flow space between it and the upper hatch cover plate, one end of the hatch cover plate 4 extends into the top of the liquid inlet tank 3 and fixes the slag retaining wall 15 at its end.

[0082] In this way, the slag retaining wall can be used to block the light slag on the upper layer of the molten liquid. At the same time, the retaining effect of the retaining dam makes the liquid inlet tank have a certain depth to ensure that the molten liquid entering the forming tank has sufficient temperature and fluidity, and ensure the effect of subsequent wire feeding and melting treatment. At the same time, the structural setting of the retaining dam and the slag retaining wall makes the liquid inlet tank form a semi-open, semi-closed, and semi-open structure, which is convenient for liquid entry and heat preservation of the molten liquid.

[0083] Among them, the outer surface of the lower end of the silk and gas delivery pipe 8 is in the shape of a cone with an increasing diameter downward, the inner cavity of the lower end of the silk and gas delivery pipe 8 is in the shape of an inverted cone with a decreasing diameter downward at the cone, and a silk outlet 11 is formed in the middle position of the inverted cone of the inner cavity, and the air outlet 12 is inclined along the cone direction of the outer surface and is evenly distributed on the periphery of the silk outlet, and the air outlet 12 and the upper port connected to the inner cavity of the silk and gas delivery pipe 8 and the lower port connected to the formation cabin are staggered in the circumferential direction, and the staggered direction of each air outlet remains consistent along the circumferential direction.

[0084] In this way, the refining gas (argon) can be discharged along the cone shape to the outside and downward, which is convenient for the melted lithium liquid to flow around and form a spiral after the wire is discharged from the wire outlet, expanding the stirring range of the argon gas and the effect of driving the lithium liquid to mix with the initial alloy melt. Therefore, it is convenient for the refining gas and the melt to be fully mixed, so that some of the impurities such as hydrogen and oxygen in the melt are brought into the refining gas and removed together, realizing gas refining; and it can drive the lithium liquid to be fully mixed with the melt around to achieve smelting.

[0085] A supporting top plate 17 is spaced apart above the hatch cover 4 , a heat-insulating insulation layer is formed between the supporting top plate 17 and the hatch cover 14 , and the silk-gas parallel delivery pipe 8 is supported and installed on the supporting top plate 17 .

[0086] In this way, it is convenient to support and install the gas and air delivery pipes, and it is also beneficial to form the insulation of the cabin.

[0087] Among them, an electric heating module 18 is also arranged outside the wire and gas delivery pipe 8, and the electric heating module is located in the heat-insulating layer. This facilitates preheating of the lithium wire and the refined gas fed in, and better ensures that the melting temperature in the formation chamber is sufficient.

[0088] Among them, the liquid outlet end of the forming chamber 5 is provided with a liquid outlet retaining wall 19 separated from the liquid outlet chamber 6, and the lower end of the liquid outlet retaining wall 19 is provided with a liquid outlet hole 20 connected to the liquid outlet chamber 6, and a liquid outlet gate 21 is correspondingly provided at the liquid outlet hole 20. This facilitates the liquid outlet control, and when necessary, the liquid outlet gate can be intermittently switched on and off to extend the residence and stirring and mixing time of the molten liquid in the forming chamber, thereby increasing the stirring and mixing smelting effect.

[0089] Among them, a vertical fixed partition 22 is arranged in the forming chamber 5 along the flow direction of the molten liquid, and the fixed partition 22 divides the forming chamber 5 into multiple small chambers along the width direction. Each small chamber is respectively provided with a silk gas delivery pipe 8, and a liquid outlet hole 20 is provided at the liquid outlet end of each small chamber to communicate with the liquid outlet chamber 6.

[0090] In this way, when special circumstances require, such as when the alloy needs to contain multiple trace (or small) alloying elements and each trace (or small) alloying element needs to react with the basic alloy to generate different intermediates and avoid mutual reaction between trace (or small) elements, each small chamber can be used for independent wire feeding and smelting, and then the melt can be controlled to mix at a certain rate and proportion to obtain a more reasonable or required specific proportion of components, and finally better control and improve the performance of the casting alloy. In addition, for example, if it is necessary to prepare an alloy containing multiple primary phases at the same time, each small chamber can be used for wire feeding and smelting at different rates to obtain an alloy melt with different components, and then cooled to a certain temperature to obtain a solid-liquid two-phase melt (including a primary precipitation phase and a liquid phase), and then the melt is controlled to mix at a certain rate and proportion to obtain an alloy melt with two different primary phases at the same time, and then an alloy containing two different primary phases at the same time is obtained, which can effectively regulate the structure and properties of the casting alloy. When this control requirement is not required, using multiple small chambers to feed and mix the same metal wire separately can also improve the mixing and stirring effect of the metal wire and the basic melt after feeding, and improve the smelting effect. When the amount of alloy melt to be prepared is small, only one small chamber may be activated to prepare the alloy melt of a certain required composition in a single thread.

[0091] The hatch cover 4 extends into the top of the liquid outlet tank 6 and leaves a hole for controlling the up and down movement of the liquid outlet gate 21. In this way, it is convenient to keep the liquid outlet tank warm and avoid air intrusion.

[0092] The bottom plate of the liquid outlet tank 6 is arranged lower than the bottom plate of the forming tank 5 and a guide slope 23 is arranged on the side adjacent to the forming tank and connected with the liquid outlet hole 20 of the forming tank.

[0093] In this way, after the liquid is discharged from the liquid discharge chamber, it falls down along the guide slope into the liquid discharge chamber, which facilitates further sufficient mixing of the molten liquid during the falling process (especially when each small chamber is fed with wire for smelting separately).

[0094] The upper surface of the guide slope 23 is upwardly protruding and provided with two groups of guide plates 24 arranged in an X-staggered array, and each guide plate 24 is vacant at the intersection point.

[0095] In this way, after the liquid is discharged from the liquid outlet holes of each small chamber, it will flow downward along the X-staggered guide plates. Since the guide plates are left vacant at the intersection points, the molten liquid can be diverted to both sides again after flowing through the intersection points. In this way, the molten liquid is continuously bifurcated and reorganized during the flow process to achieve full mixing, which greatly improves the further full mixing of the molten liquid after the wire is fed into each small chamber (especially when the wire is fed and smelted separately in each small chamber).

[0096] Among them, a corresponding plug 25 is arranged at the upper end of the liquid outlet channel 7, and a vertical rod 26 is fixedly arranged upward on the plug 25. The vertical rod can slide up and down through the hatch cover and is connected to a horizontally arranged control lever 27. The fulcrum of the control lever is hinged at the upper end of the liquid outlet side of the liquid outlet tank. In this way, the outflow speed of the mixed alloy melt can be controlled by operating the plug with the control lever, and the flow rate can be flexibly adjusted according to production needs. Reducing the melt outflow speed can extend the mixing time between the components and improve the melt uniformity, and increasing the melt outflow speed can improve production efficiency. It is convenient to realize liquid outflow control.

[0097] Example 2, see Figure 6 The difference between the present embodiment 2 and the embodiment 1 is that in the alloy melt continuous forming device adopted, a stirring device is also provided in the forming chamber 5. This can further achieve the stirring and mixing effect.

[0098] Specifically, the stirring device includes a stirring blade 30 disposed in the forming chamber 5, the stirring blade 30 is mounted on a vertically disposed stirring shaft 31, the upper end of the stirring shaft 31 is mounted on a supporting top plate and connected to a stirring motor 32. This has a simple structure, mature technology, and is easy to implement.

[0099] The rest of the embodiment 2 is the same as the embodiment 1 and will not be described again here.

[0100] Example 3: The only difference between Example 3 and Example 2 is that the structure of the stirring device in the alloy melt continuous forming device is different.

[0101] See also Figure 7-Figure 8 In this embodiment 3, the stirring device is a pumping stirring device, which includes two vertically arranged pumping pipes 40. The pumping pipes 40 are made of high-temperature resistant materials (high temperature refers to the temperature of smelting alloy). The pumping pipes 40 are symmetrically arranged on both sides of the wire gas delivery pipe 8. A pumping port 41 is opened at the lower end of the pumping pipe 40, and a pumping pressure control device is connected to the upper end of the pumping pipe 40.

[0102] In this way, the melt is continuously pumped in and out by two extraction pipes, fully achieving mixing and stirring of the solution. Compared with the stirring method using stirring blades, it can better prevent the blades from stirring to create gaps in the melt and affect the quality of the melt.

[0103] Among them, the extraction and pressure control device includes an exhaust pipe 42 and an injection pipe 43, one end of which is connected to the upper end of the extraction and injection pipe 40, and the other end of the injection pipe 43 is connected to a compressed gas tank 46 after an injection electric control valve 44 and a barometer 45 are arranged in series. The other end of the exhaust pipe 42 is connected to an exhaust pump 48 after an exhaust electric control valve 47 is arranged in series. The injection electric control valve 44, the barometer 45, the exhaust electric control valve 47 and the exhaust pump 48 are respectively connected to the control center 49. A control module is arranged in the control center 49 for realizing the opening and closing of the injection electric control valve 47 of the compressed gas tank and the switching control of the exhaust electric control valve 47 and the exhaust pump 48.

[0104] In this way, when the compressed gas tank's gas injection electric control valve is closed, the gas extraction electric control valve and the gas extraction pump are opened, so that the gas injection pipe stops working and the gas extraction pipe extracts gas from the extraction pipe to form a negative pressure, so that the molten liquid is sucked into the extraction pipe from the extraction port; then the compressed gas tank's gas injection electric control valve is switched to open, and the gas extraction electric control valve and / or the gas extraction pump are controlled to close at the same time, so that the gas extraction pipe stops working and the gas injection pipe injects gas into the extraction pipe to form a positive pressure, so that the molten liquid in the extraction pipe is pressed out from the extraction port back into the molten liquid pool. This repeated cycle switching is used to control the extraction action of the extraction pipe, so that the molten liquid is repeatedly sucked into the extraction pipe and injected, achieving a mixing and stirring effect on the solution.

[0105] The control module of the control center 49 is also provided with a timing control program, which is used to control the pumping tubes on both sides to synchronously perform pumping actions for several rounds, and then control the pumping tubes on both sides to alternately perform pumping actions for several rounds and repeat this cycle.

[0106] In this way, since the injection port of the injection pipe is set downward, in the process of the injection pipes on both sides performing the injection action synchronously, when sucking the molten liquid, the lower layer of the molten liquid can be sucked into the injection pipe by rapid suction, and the upper layer of the molten liquid can be stopped when it drops to the vicinity of the injection port; then, when the molten liquid in the injection pipe is pressed back, the molten liquid can be slowly injected to make it flow back to the top of the molten pool, so as to realize the up and down exchange flow of the molten liquid in the molten pool. Then, in the process of the injection pipes on both sides performing the injection action alternately, when the injection pipe on one side sucks the solution, the injection pipe on the other side correspondingly presses out the molten liquid, so as to realize the repeated flow of the molten liquid in the horizontal direction in the molten pool. Therefore, this control method can realize the repeated exchange flow control of the molten liquid in the vertical and horizontal directions successively, greatly improving the stirring control effect of the molten liquid, and overcoming the defects of the blade stirring method that easily leads to uneven stirring and the generation of gaps in the molten liquid.

[0107] The gas in the compressed gas tank 46 is refined gas (argon gas), so as to better achieve gas protection.

[0108] In the process of controlling the pumping and injection of the pumping and injection tube 40 by the control module, the volume of the pumping and injection is smaller than the volume of the injection.

[0109] This way, the injection volume is larger, which can better press out the molten metal sucked into the injection pipe during suction, avoiding the molten metal from adhering to the inner wall of the injection pipe. At the same time, part of the refined gas can be directly pressed into the molten pool during injection, further improving the dehydrogenation effect of gas refining while stirring and mixing.

[0110] Among them, the upper end of each extraction tube 40 is also provided with a lifting control mechanism connected thereto.

[0111] In this way, by controlling the lifting and lowering of the pumping tube, the exchange and stirring effect of the upper and lower layer solutions in the solution pool can be better assisted.

[0112] The lifting control mechanism is installed on the upper surface of the supporting top plate, and the pumping pipe 40 can slide up and down through the hatch cover and the supporting top plate and is connected to the lifting mechanism, so that installation and control can be easily realized.

[0113] The lifting mechanism includes a vertically arranged telescopic electric cylinder 50, a telescopic head 51 of the telescopic electric cylinder 50 is fixed to the pumping pipe 40 through a horizontal connecting beam, and a motor of the telescopic electric cylinder is connected to a control center, so that installation and control can be realized conveniently.

[0114] Among them, the outer wall of the injection tube and the upper end of the inner cavity wall are each installed with a downward ultrasonic liquid level detector 52, and the ultrasonic liquid level detector 52 is connected to the control center 49. In this way, the liquid level inside and outside the injection tube can be monitored in real time, which better assists in achieving control.

[0115] The outer wall of the pumping tube 40 is also provided with an electric heating device, so as to conveniently heat the inside of the pumping tube.

Claims

1. A method for continuously preparing an alloy melt containing an easily oxidizable or easily segregated element in-situ, wherein the smelting of other alloy components except the easily oxidizable or easily segregated element is completed to obtain an initial alloy melt, characterized in that: Before casting, wires containing easily oxidized or easily segregated elements and refining gas are continuously fed into the initial alloy melt in a wire-gas simultaneous feeding manner. Under the protection and stirring action of the refining gas, the wires containing easily oxidized or easily segregated elements are melted by the continuously flowing high-temperature initial alloy melt, and an alloy melt containing easily oxidized or easily segregated elements is formed in situ. Gas refining is simultaneously achieved by removing hydrogen from the melt with the refining gas.

2. The method for continuous in-situ preparation of an alloy melt containing easily oxidizable or easily segregated elements according to claim 1, characterized in that: The easily oxidizable or easily segregated element is lithium, the alloy containing the easily oxidizable or easily segregated element is a lithium-containing alloy, and the wire material containing the easily oxidizable or easily segregated element is a lithium-containing wire material.

3. The method for continuously preparing an alloy melt containing easily oxidizable or easily segregated elements according to claim 2, characterized in that: The lithium content of the lithium-containing alloy is less than 50 w%, and the optimal content range is 5-15 w%; The refining gas is argon.

4. The method for continuously preparing an alloy melt containing easily oxidizable or easily segregated elements in-situ according to claim 2, characterized in that: The lithium-containing wire enters the area below 1 / 2 depth of the initial alloy melt; The diameter of the lithium-containing wire is 1.2-4 mm, the wire feeding speed of the lithium-containing wire is 1.5-15 m / min, the initial alloy melt depth at the lithium-containing wire feeding position is 170-220 mm, the width is 200 mm, and the refining gas flow rate is 5-25 L / min.

5. The method for continuous in-situ preparation of an alloy melt containing easily oxidizable or easily segregated elements according to claim 1, characterized in that: The method is implemented by relying on a device for continuously forming an alloy melt, the device comprising a container made of a high-temperature resistant material, a liquid inlet is arranged above one end of the container, a liquid inlet tank is arranged correspondingly below the liquid inlet, the liquid inlet tank is connected forwardly to a forming tank with a tank cover, the forming tank is connected forwardly to a liquid outlet tank which is closed as a whole, a liquid outlet channel is arranged below the liquid outlet tank, a wire gas and wire delivery pipe is also vertically arranged on the tank cover of the forming tank, the upper end of the wire gas and wire delivery pipe is exposed above the tank cover and is sealed upwardly with an air delivery pipe and a wire feeding pipe, both of which are connected with the inside of the wire gas and wire delivery pipe, the outer end of the air delivery pipe is used to be connected to a refining gas tank, the outer end of the wire feeding pipe is used to be connected to a wire feeding power mechanism, the lower end of the wire gas and wire delivery pipe is located in the middle and lower position inside the forming tank, a wire outlet is arranged in the middle of the lower end of the wire gas and wire delivery pipe, and a plurality of air outlets are distributed around the wire outlet.

6. The method for continuous in-situ preparation of an alloy melt containing easily oxidizable or easily segregated elements according to claim 5, characterized in that: A concave impact groove is provided on the bottom plate of the liquid inlet tank directly below the liquid inlet port; A slag discharge port is provided at the upper end of the liquid inlet of the liquid inlet tank which is away from the forming tank direction.

7. The method for continuous in-situ preparation of an alloy melt containing easily oxidizable or easily segregated elements according to claim 5, characterized in that: A slag retaining wall located above and a retaining dam located below are vertically arranged in the liquid inlet tank in the direction of molten liquid flow. A liquid flow space is left between the slag retaining wall and the bottom plate of the liquid inlet tank below. The retaining dam is connected to the forming tank and has a liquid flow space between it and the hatch cover plate above. One end of the hatch cover plate extends into the top of the liquid inlet tank and fixes the slag retaining wall at its end.

8. The method for continuously preparing an alloy melt containing easily oxidizable or easily segregated elements in-situ according to claim 5, characterized in that: The outer surface of the lower end of the silk and gas delivery pipe is in the shape of a cone with a diameter increasing downward, and the inner cavity of the lower end of the silk and gas delivery pipe is in the shape of an inverted cone with a diameter decreasing downward at the cone. A silk outlet is formed in the middle position of the inverted cone of the inner cavity. The air outlet is inclined along the cone direction of the outer surface and is evenly distributed on the periphery of the silk outlet. The upper port where the air outlet is connected to the inner cavity of the silk and gas delivery pipe and the lower port connected to the forming cabin are staggered in the circumferential direction, and the staggered direction of each air outlet remains consistent along the circumferential direction.

9. The method for continuous in-situ preparation of an alloy melt containing easily oxidizable or easily segregated elements according to claim 5, characterized in that: A supporting top plate is arranged above the hatch cover plate, a heat-insulating layer is formed between the supporting top plate and the hatch cover plate, and the silk gas delivery pipe support is installed on the supporting top plate; An electric heating module is also arranged outside the silk-gas delivery pipe, and the electric heating module is located inside the thermal insulation layer.

10. The method for continuously preparing an alloy melt containing easily oxidizable or easily segregated elements in-situ according to claim 5, characterized in that: The liquid outlet end of the formation tank is provided with a liquid outlet retaining wall separated from the liquid outlet tank, the lower end of the liquid outlet retaining wall is provided with a liquid outlet hole connected to the liquid outlet tank, and a liquid outlet gate is provided at the liquid outlet hole; A vertical fixed partition is arranged in the forming chamber along the flow direction of the molten liquid. The fixed partition divides the forming chamber into a plurality of small chambers along the width direction. Each small chamber is provided with a wire gas delivery pipe. A liquid outlet hole is arranged at the liquid outlet end of each small chamber and communicates with the liquid outlet chamber. The hatch cover extends into the top of the liquid discharge tank and is provided with a clearance hole for controlling the up and down movement of the liquid discharge gate; The bottom plate of the liquid outlet tank is arranged lower than the bottom plate of the forming tank, and a diversion slope is arranged on the side adjacent to the forming tank and connected with the liquid outlet hole of the forming tank; The upper surface of the guide slope is upwardly protruding and provided with two groups of guide plates arranged in an X-staggered array, and each guide plate is vacant at the staggered point position; A corresponding plug is provided on the upper port of the liquid outlet channel, and a vertical rod is fixed upwardly on the plug. The vertical rod can slide up and down through the hatch cover and is connected to a horizontally arranged control lever. The fulcrum of the control lever is hinged at the upper end position of the liquid outlet side of the liquid outlet tank.

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