CN116200619A - Lithium adding system and lithium adding method for smelting aluminum lithium alloy in medium-frequency smelting furnace - Google Patents
Lithium adding system and lithium adding method for smelting aluminum lithium alloy in medium-frequency smelting furnace Download PDFInfo
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- CN116200619A CN116200619A CN202310179893.XA CN202310179893A CN116200619A CN 116200619 A CN116200619 A CN 116200619A CN 202310179893 A CN202310179893 A CN 202310179893A CN 116200619 A CN116200619 A CN 116200619A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/14—Charging or discharging liquid or molten material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a lithium adding system for smelting aluminum lithium alloy in an intermediate frequency smelting furnace, which comprises the intermediate frequency smelting furnace and a lithium adding device, wherein the lithium adding device is provided with a glove operation box, a winding structure, an argon protection cover and a lithium adding frame; the intermediate frequency smelting furnace and the lithium adding device are detachably connected, and the furnace cover of the intermediate frequency smelting furnace is arranged corresponding to the argon protection cover; the lithium adding frame is arranged inside the argon protection cover; the glove operation boxes are communicated with the argon protection cover, so that lithium ingots in the glove operation boxes enter a lithium adding frame; the hoisting structure is provided with a connecting piece connected with the lithium adding frame so as to realize lifting of the lithium adding frame. The present application also provides a method for adding metallic lithium to an aluminum alloy melt using a lithium adding system. The application provides a system and a method for adding a metal lithium ingot into an aluminum alloy melt under the protection of argon, which can avoid the problems of reducing the purity of the melt and lithium element loss caused by the problems of oxidization, nitridation, splashing and the like in the lithium adding process.
Description
Technical Field
The invention relates to the technical field of aluminum lithium alloy smelting, in particular to a lithium adding system and a lithium adding method for smelting aluminum lithium alloy in a medium-frequency smelting furnace.
Background
Lithium is the metal with the smallest density, the corresponding simple substance is silver white soft metal, and lithium is the metal with the strongest activity in the known elements due to the most negative electrode potential.
The aluminum-lithium alloy has light weight, high specific strength and corrosion resistance, can greatly improve the fatigue resistance and the low-temperature toughness, and becomes an important novel aerospace material for the current development of various countries. In the process of smelting aluminum lithium alloy, solid or molten metal lithium needs to be added in the molten state of the aluminum alloy. The metallic lithium in solid or molten state is extremely reactive with water, oxygen and nitrogen in air, as well as with various materials that are contacted during the process. In order to overcome the above reaction problems, researchers have employed a number of methods, such as using a lithium-containing halide flux, adding lithium through an aluminum-lithium master alloy, smelting under vacuum or under inert gas protection, and the like. Wherein, smelting is carried out under the protection of inert gas, especially argon, so as to obtain industrial scale application; however, since lithium has a low melting point and a low density, it is easy to float on the upper layer of the aluminum melt during the addition process, resulting in a large amount of burning loss and splashing of lithium. The method of adding lithium by vacuum melting has the following disadvantages: the process window is narrow, the effect of removing impurity elements such as hydrogen, potassium, sodium and the like is poor, or the loss of main alloy elements such as lithium, magnesium and the like is large.
The U.S. Kaiser aluminum company invented a way of adding liquid lithium (patent number 4761266) by measuring the casting speed, and adding liquid lithium after one degassing with the lithium-free aluminum alloy liquid by vortex flow, wherein the method has a large influence on the uniformity of casting components and quality such as inclusion due to the viscosity of the alloy being a function of temperature. The loving company invented a liquid lithium adding mode (publication numbers CN105102643 and CN 105358723), after smelting lithium-containing and lithium-free aluminium alloys respectively, they are mixed by launder in casting, and the disadvantage of this invention is that since only the melt containing no lithium is degassed, there is no degassing and filtering process for lithium-containing aluminium alloys, there is no possibility of a lot of impurities flowing into cast ingot, forming defects. In addition, the three alloys are prepared separately, the protective atmosphere and the protective salt are used in a staggered manner, errors are difficult to avoid in actual production, and especially particles of the protective salt are difficult to clean by a conventional filter.
Therefore, the method of adding lithium as a master alloy has the following problems: on the one hand, in the process of preparing the intermediate alloy, the introduction of impurities in the preparation of the aluminum-lithium alloy is increased in the process of adding and smelting lithium; on the other hand, the lithium content in the aluminum-lithium alloy is generally 1% -3%, a large amount of intermediate alloy is needed, lithium is lost due to secondary oxidation and nitridation in the storage and remelting processes, and in addition, the intermediate alloy is needed to be stored in a special mode, so that the storage difficulty of raw materials for preparing the aluminum-lithium alloy is increased.
The metal lithium ingot is wet and inflammable, belongs to dangerous chemicals, and is packaged in a mode of filling dry argon gas into an aluminum-plastic composite bag in a sealing mode in national standards. At present, domestic aluminum lithium alloy manufacturers adopt a method of adding lithium into a melt after rapidly removing and packaging lithium ingots in air, or directly adding the packaged lithium ingots into the melt. The disadvantage of both of these schemes is that: (1) the metal lithium is oxidized and nitrided to be blackened to form lithium oxide and lithium nitride within 3-5s after the packaging bag is removed in the air, and then the lithium oxide and the lithium nitride are whitened to form lithium carbonate, so that a great amount of lithium element is lost and melt splashing is easy to occur; (2) the purity of the melt is reduced by adding lithium metal with a package, and the smell of the melted packaging material is difficult to tolerate, so that the packaging material is not beneficial to professional health; (3) causing the lithium ingot to float on the surface of the melt, burning out a lot and generating splash.
In view of the above-mentioned current situation, it is significant to provide a method for adding metallic lithium into an aluminum alloy melt, so as to avoid the problems of reducing the purity of the melt and the loss of lithium element during the addition of lithium.
Disclosure of Invention
The invention solves the technical problem of providing a lithium adding system and a lithium adding method for smelting aluminum-lithium alloy in a medium-frequency smelting furnace.
In view of the above, the application provides a lithium adding system for smelting aluminum lithium alloy in a medium frequency smelting furnace, which comprises the medium frequency smelting furnace and a lithium adding device, wherein the lithium adding device is provided with a glove box, a winding structure, an argon protecting cover and a lithium adding frame;
the intermediate frequency smelting furnace and the lithium adding device are detachably connected, and the furnace cover of the intermediate frequency smelting furnace is arranged corresponding to the argon protection cover;
the lithium adding frame is arranged inside the argon protection cover;
the glove operation boxes are communicated with the argon protection cover, so that lithium ingots in the glove operation boxes enter a lithium adding frame;
the hoisting structure is provided with a connecting piece connected with the lithium adding frame so as to realize the lifting of the lithium adding frame;
the glove box is provided with an argon gas inlet valve, and the argon gas protection cover is provided with an argon gas hole.
Preferably, the lithium adding frame comprises a grid for placing a plurality of lithium ingots and a counterweight base arranged at the bottom of the grid.
Preferably, the grid is made of stainless steel, and the counterweight base is made of stainless steel.
Preferably, the argon protection cover is provided with a lithium ingot loading hole so as to enable a lithium ingot to enter the lithium adding frame through the lithium ingot loading hole.
The application also provides a method for adding metal lithium into an aluminum alloy melt by using the lithium adding system, which comprises the following steps:
a) Putting the lithium ingot packaged by argon into the glove box;
b) When the aluminum alloy in the intermediate frequency smelting furnace is melted and the temperature of the melt is suitable for adding lithium, filling argon above the melt of the intermediate frequency smelting furnace, and connecting the lithium adding device with the intermediate frequency smelting furnace;
c) Filling argon into the lithium adding device to ensure that the glove operation box and the argon protecting cover are slightly positive in pressure, and opening the furnace cover of the intermediate frequency smelting furnace to ensure that the argon protecting cover and the furnace cover are in butt joint;
d) When the oxygen concentration in the lithium adding device is lower than 0.5%, unpacking a lithium ingot and then entering the lithium adding frame; lowering the lithium adding frame through the winch, repeating the steps of opening the seal of the lithium ingot and then entering the lithium adding frame until all the lithium ingot is filled in the lithium adding frame;
e) And the lithium adding frame is lowered into the melt body of the intermediate frequency smelting furnace through the winch.
Preferably, the step E) further includes:
f) After the lithium ingot is completely melted, the lithium adding frame is lifted into the argon protection cover through the hoisting structure;
separating the lithium adding device from the intermediate frequency smelting furnace and closing a furnace cover of the intermediate frequency smelting furnace;
g) And closing an argon inlet valve of the lithium adding device, and cleaning the lithium adding device.
Preferably, in step B), the melt temperature is suitably at a temperature of 700-750 ℃.
Preferably, in step a), the oxygen concentration in the glove box is made lower than 0.5% by argon purging.
The application provides a lithium adding system for smelting aluminum lithium alloy in an intermediate frequency smelting furnace, which comprises the intermediate frequency smelting furnace and a lithium adding device, wherein the lithium adding device is provided with a glove operation box, a winding structure, an argon protection cover and a lithium adding frame; the lithium adding system provided by the application enables the lithium ingot to be placed in the glove operation box, so that the oxidation and nitridation of metal lithium can be greatly reduced, the intrinsic characteristics of the lithium after adding are maintained, meanwhile, the lithium ingot can be quickly reduced into the melt after being added into the lithium adding frame, and the splashing of the lithium ingot in the melt is reduced. Further, this application is provided with the counter weight base in the bottom of adding the lithium frame, can overcome the lithium ingot and add lithium frame self buoyancy for the speed of immersion fuse-element also can reduce the splashing of lithium ingot.
The application also provides a method for adding metal lithium into the aluminum alloy melt by using the lithium adding system, wherein in the lithium adding process, the glove operation box and the lithium adding device are filled with argon gas so as to greatly reduce the oxidation and nitridation of the metal lithium, and meanwhile, the lithium ingot is added through the lithium adding frame when the temperature of the aluminum alloy melt is proper, so that the lithium ingot can be effectively ensured to be immersed into the melt rapidly, and the splashing problem during the adding of the lithium ingot is reduced.
In summary, the application provides a system and a method for adding a metal lithium ingot into an aluminum alloy melt under the protection of argon, which can avoid the problems of reducing the purity of the melt and lithium element loss caused by the problems of oxidization, nitridation, splashing and the like in the lithium adding process.
Drawings
Fig. 1 is a schematic diagram of a front structure and a schematic diagram of a back structure of a lithium adding device provided by the invention;
fig. 2 is a schematic cross-sectional structure of the lithium adding device provided by the invention;
fig. 3 is a schematic structural diagram of a lithium adding frame provided by the invention;
fig. 4 is a schematic diagram of the position change of the lithium adding frame in the intermediate frequency smelting furnace.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
In view of the problem that a lithium adding method in an intermediate frequency smelting furnace for smelting aluminum lithium alloy easily causes lithium element loss in the prior art, the application provides a lithium adding system and a lithium adding method for smelting aluminum lithium alloy in an intermediate frequency smelting furnace.
Fig. 1 is a front structure schematic diagram and a back structure schematic diagram of a lithium adding device, wherein in the figure, a box door 1-1, a box body 1-2, a glove hole 1-3, a glass fiber reinforced plastic panel 1-4, a box door sealing rubber strip 1-5, a counterweight supporting leg 1-6, an argon gas inlet valve 1-7 and an explosion venting valve 1-8 form a glove operation box; 2-1 is a winch, 2-2 steel wire ropes, 2-3 is pulleys, 2-4 is a pulley support, and the parts form a winch structure; fig. 2 is a schematic cross-sectional structure of a lithium adding device, wherein 3-1 is a protective cover shell, 3-2 is a steel wire rope/lithium adding frame boom guide hole, 3-3 is an argon distribution pipe, 3-4 is an argon air hole, 3-5 is a lithium ingot installation hole, the parts form an argon protective cover, fig. 3 is a schematic structure of a lithium adding frame, 4-1 is a boom, 4-2 is a cover plate, 4-3 is a grid, and 4-4 is a counterweight base, and the parts form the lithium adding frame. Specifically, the embodiment of the invention discloses a lithium adding system for smelting aluminum lithium alloy in a medium-frequency smelting furnace, which comprises the medium-frequency smelting furnace and a lithium adding device, wherein the lithium adding device is provided with a glove operation box, a winding structure, an argon protection cover and a lithium adding frame;
the intermediate frequency smelting furnace and the lithium adding device are detachably connected, and the furnace cover of the intermediate frequency smelting furnace is arranged corresponding to the argon protection cover;
the lithium adding frame is arranged inside the argon protection cover;
the glove operation boxes are communicated with the argon protection cover, so that lithium ingots in the glove operation boxes enter a lithium adding frame;
the hoisting structure is provided with a connecting piece connected with the lithium adding frame so as to realize the lifting of the lithium adding frame;
the glove box is provided with an argon gas inlet valve, and the argon gas protection cover is provided with an argon gas hole.
In the lithium adding system provided by the application, the box door in the glove operation box is used for enabling a lithium ingot to pass through the operation box; the counterweight support feet are arranged for balancing the weight of the lithium adding frame; the argon gas inlet valve is provided with a quick connector so as to enable argon gas to be filled in; the explosion venting valve is used for unexpected situations to vent explosion when the air pressure in the box body is too high.
The glove operation box is communicated with the argon protection cover, so that lithium ingots in the glove operation box enter the lithium adding frame. The argon protection cover is provided with an argon hole so as to enable argon to be introduced; the bottom of the argon protection cover is provided with a lithium ingot loading hole so that a lithium ingot in the glove operation box enters the argon protection cover through the lithium ingot loading hole.
The hoisting structure is connected with the lithium adding frame through a steel wire rope and a steel wire rope/lithium adding frame boom guide hole in the argon protection cover, so that the lithium adding frame is lifted in the argon protection cover.
The lithium adding frame is provided with a grid so as to realize the loading of a plurality of lithium ingots, the bottom of the lithium adding frame is provided with a counterweight base which is used for overcoming the buoyancy of the lithium ingots and the lithium adding frame and accelerating the speed of the lithium ingots immersed in the melt, and the counterweight base also has a heat insulation effect so as to prevent the environment temperature of the lithium adding frame from being too high when the lithium ingots are loaded and the temperature of the loaded lithium ingots from being too high when the lithium ingots are immersed in the melt. The lithium adding frame is made of stainless steel, more specifically austenitic stainless steel, the austenitic stainless steel is of an austenitic structure at high temperature and normal temperature, the austenitic stainless steel cannot crack due to stress generated by frequent phase transformation, meanwhile, the austenitic stainless steel is heat-resistant, and is not easy to dissolve when immersed into aluminum melt to cause melt iron increase, so that the performance of the aluminum-lithium alloy is deteriorated.
The application also provides a method for adding metal lithium into an aluminum alloy melt by using the lithium adding system, which comprises the following steps:
a) Putting the lithium ingot packaged by argon into the glove box;
b) When the aluminum alloy in the intermediate frequency smelting furnace is melted and the temperature of the melt is suitable for adding lithium, filling argon above the melt of the intermediate frequency smelting furnace, and connecting the lithium adding device with the intermediate frequency smelting furnace;
c) Filling argon into the lithium adding device to ensure that the glove operation box and the argon protecting cover are slightly positive in pressure, and opening the furnace cover of the intermediate frequency smelting furnace to ensure that the argon protecting cover and the furnace cover are in butt joint;
d) When the oxygen concentration in the lithium adding device is lower than 0.5%, unpacking a lithium ingot and then entering the lithium adding frame; lowering the lithium adding frame through the winch, repeating the steps of opening the seal of the lithium ingot and then entering the lithium adding frame until all the lithium ingot is filled in the lithium adding frame;
e) And the lithium adding frame is lowered into the melt body of the intermediate frequency smelting furnace through the winch.
In the process of adding metal lithium in the lithium adding system, the box door of the glove box is opened, the lithium ingot packaged by argon is placed in the glove box, and the box door of the glove box is locked. At the same time, aluminum ingots and other alloys in the medium-frequency smelting furnace are smelted.
And when the temperature of the melt in the intermediate frequency smelting furnace is raised to 700-750 ℃, filling argon above the melt, transferring the lithium adding device to the upper part of a furnace cover of the intermediate frequency smelting furnace, aligning an argon protection cover with a furnace cover of the intermediate frequency smelting furnace, and connecting the lithium adding device with the intermediate frequency smelting furnace. As shown in the first figure in fig. 4, this figure shows that the lithium adding device is connected to the intermediate frequency smelting furnace and that a lithium ingot is placed in the glove box.
According to the invention, an argon gas inlet valve of the lithium adding device is opened, so that micro positive pressure is kept in the glove box and the argon gas protective cover, and the subsequent lithium ingot reaction is avoided; then opening a furnace cover of the intermediate frequency smelting furnace to enable the lower edge of the argon protection cover to be in butt joint with the furnace cover of the intermediate frequency smelting furnace; in the process, the argon concentration detection is carried out on the glove box and the argon protection cover, so that the glove box is ensured to be filled with argon, and the oxidation nitridation of the metal lithium is reduced to the greatest extent.
As shown in the second graph of fig. 4, the specific position of the lithium adding system after the lithium adding frame completes the charging is shown in the graph, and the process specifically comprises: when the oxygen concentration in the lithium adding device is lower than 0.5%, the lithium ingot package is disassembled, the lithium ingot is pushed into the lithium adding frame, the lithium adding frame is lowered through the winch, and the next layer of lithium ingot is conveniently filled until all the lithium ingots are filled into the lithium adding frame.
The lithium adding frame is quickly lowered to be completely immersed into the melt in the furnace through the winch, so that splashing is reduced, and the lithium ingot is added into the aluminum alloy melt, and is particularly shown in a third diagram in fig. 4. After the lithium ingot is completely melted, lifting the lithium adding frame into an argon protective cover through a winch, and then lifting the lithium adding device away and rapidly closing a furnace cover of the medium-frequency smelting furnace; and finally, after the lithium adding device is placed to a designated position, closing an argon gas inlet valve, opening a glove box door, and cleaning a lithium ingot packaging material for later use.
The lithium adding system and the lithium adding method can reduce contact of the lithium ingot with oxygen, nitrogen and water to the greatest extent, and can also prevent the lithium ingot from floating on the surface of the melt to splash.
In order to further understand the present invention, the lithium adding system and the lithium adding method for smelting aluminum lithium alloy in the smelting furnace provided by the present invention are described in detail below with reference to examples, and the scope of protection of the present invention is not limited by the following examples.
Example 1
The lithium adding system for smelting the aluminum lithium alloy in the intermediate frequency smelting furnace comprises the intermediate frequency smelting furnace and a lithium adding device, wherein the lithium adding device is provided with a glove operation box, a winding structure, an argon protection cover and a lithium adding frame; as particularly shown in fig. 1, 2 and 3;
the glove operation box consists of 1-1 box door, 1-2 box body, 1-3 glove holes, 1-4 glass fiber reinforced plastic panel, 1-5 box door sealing rubber strips, 1-6 counterweight supporting feet, 1-7 argon gas inlet valve and 1-8 explosion venting valve;
the hoisting structure consists of a 2-1 hoist, a 2-2 steel wire rope, a 2-3 pulley and a 2-4 pulley support;
the argon protection cover consists of a 3-1 protection cover shell, a 3-2 steel wire rope/lithium adding frame suspender guide hole, a 3-3 argon distribution pipe, a 3-4 argon air hole and a 3-5 lithium ingot filling hole;
the lithium adding frame consists of a 4-1 suspender, a 4-2 cover plate, a 4-3 grid and a 4-4 counterweight base;
the intermediate frequency smelting furnace and the lithium adding device are detachably connected, and the furnace cover of the intermediate frequency smelting furnace is arranged corresponding to the argon protection cover;
the lithium adding frame is arranged inside the argon protection cover;
the glove operation boxes are communicated with the argon protection cover, so that lithium ingots in the glove operation boxes enter a lithium adding frame;
the hoisting structure is provided with a connecting piece connected with the lithium adding frame so as to realize lifting of the lithium adding frame.
Example 2
The method for smelting 2050 aluminum lithium alloy (wherein the lithium content is 0.8 wt%) under the protection of argon by using the lithium adding system of example 1 comprises the following steps:
the first step: opening a glove box door, putting a lithium ingot packaged by argon into a glove box, and locking the glove box door;
and a second step of: when aluminum ingots and other alloys in the medium-frequency smelting furnace are melted, the contents of other alloy elements except lithium all meet the requirements of the aluminum lithium alloy with the trade name of 2050 in the national standard, the temperature is raised to 720 ℃, argon is filled above the melt, a lithium adding device is regulated and transported above a furnace cover of the medium-frequency smelting furnace by a crane, and an argon protection cover is aligned with the furnace cover of the medium-frequency smelting furnace;
and a third step of: opening an argon inflation valve of the lithium adding device to ensure that the operation box and the protective cover are kept at micro positive pressure; opening a furnace cover of the intermediate frequency smelting furnace to enable the lower edge of the argon protection cover to be in butt joint with a furnace cover hole;
fourth step: when the oxygen concentration in the lithium adding device is lower than 0.5%, unpacking the lithium ingot, pushing the lithium ingot into the lithium adding frame along the charging guide groove, and lowering the lithium adding frame through a winch so as to be convenient for loading the next layer of lithium ingot until the lithium ingot with the mass fraction of 0.8% is loaded into the lithium adding frame;
fifth step: the lithium adding frame is quickly lowered to be totally immersed into the melt in the furnace through a winch;
sixth step: after the lithium ingot is completely melted, lifting the lithium adding frame into the argon protection cover through a winch;
seventh step: hanging the lithium adding device away by a crown block and rapidly closing the furnace cover of the medium-frequency smelting furnace;
eighth step: after the lithium adding device is placed to a designated position, an argon gas inlet valve is closed, a glove box door is opened, and a lithium ingot packaging material is cleaned for standby.
The components of the prepared aluminum-lithium alloy are detected, and the result shows that: the lithium content in the 2050 aluminum lithium alloy prepared in this example was 0.786wt%.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The lithium adding system for smelting the aluminum lithium alloy in the intermediate frequency smelting furnace comprises the intermediate frequency smelting furnace and a lithium adding device, wherein the lithium adding device is provided with a glove operation box, a winding structure, an argon protection cover and a lithium adding frame;
the intermediate frequency smelting furnace and the lithium adding device are detachably connected, and the furnace cover of the intermediate frequency smelting furnace is arranged corresponding to the argon protection cover;
the lithium adding frame is arranged inside the argon protection cover;
the glove operation boxes are communicated with the argon protection cover, so that lithium ingots in the glove operation boxes enter a lithium adding frame;
the hoisting structure is provided with a connecting piece connected with the lithium adding frame so as to realize the lifting of the lithium adding frame;
the glove box is provided with an argon gas inlet valve, and the argon gas protection cover is provided with an argon gas hole.
2. The lithium adding device according to claim 1, wherein the lithium adding frame comprises a grid for placing a plurality of lithium ingots and a counterweight base arranged at the bottom of the grid.
3. The lithiation device of claim 1, wherein the grid is stainless steel and the counterweight base is stainless steel.
4. The lithium adding device according to claim 1, wherein the argon gas protective cover is provided with a lithium ingot loading hole so as to enable a lithium ingot to enter the lithium adding frame through the lithium ingot loading hole.
5. A method of adding metallic lithium to an aluminum alloy melt using the lithium addition system of claim 1, comprising the steps of:
a) Putting the lithium ingot packaged by argon into the glove box;
b) When the aluminum alloy in the intermediate frequency smelting furnace is melted and the temperature of the melt is suitable for adding lithium, filling argon above the melt of the intermediate frequency smelting furnace, and connecting the lithium adding device with the intermediate frequency smelting furnace;
c) Filling argon into the lithium adding device to ensure that the glove operation box and the argon protecting cover are slightly positive in pressure, and opening the furnace cover of the intermediate frequency smelting furnace to ensure that the argon protecting cover and the furnace cover are in butt joint;
d) When the oxygen concentration in the lithium adding device is lower than 0.5%, unpacking a lithium ingot and then entering the lithium adding frame; lowering the lithium adding frame through the winch, repeating the steps of opening the seal of the lithium ingot and then entering the lithium adding frame until all the lithium ingot is filled in the lithium adding frame;
e) And the lithium adding frame is lowered into the melt body of the intermediate frequency smelting furnace through the winch.
6. The method according to claim 5, wherein after the step E), further comprising:
f) After the lithium ingot is completely melted, the lithium adding frame is lifted into the argon protection cover through the hoisting structure;
separating the lithium adding device from the intermediate frequency smelting furnace and closing a furnace cover of the intermediate frequency smelting furnace;
g) And closing an argon inlet valve of the lithium adding device, and cleaning the lithium adding device.
7. The method according to claim 5 or 6, characterized in that in step B) the melt temperature is suitable for lithium addition at a temperature of 700-750 ℃.
8. The method according to claim 5 or 6, wherein in step a) the oxygen concentration in the glove box is kept below 0.5% by argon purging.
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