Device and method for jointly smelting magnesium by using vacuum magnesium smelting furnace and normal-pressure medium-frequency induction furnace

Abstract

According to the device and method for jointly smelting magnesium through the vacuum magnesium smelting furnace and the normal-pressure medium-frequency induction furnace, the method comprises the steps that blocky high-silicon iron in the vacuum magnesium smelting furnace is heated, so that the blocky high-silicon iron in the furnace is molten to form a silicon iron molten pool; the calcined white powder is sprayed into a ferrosilicon molten pool of the vacuum magnesium smelting furnace, so that the calcined white powder and the ferrosilicon molten pool are subjected to a reduction reaction to generate magnesium steam; when the silicon iron liquid in the vacuum magnesium smelting furnace is consumed to a preset amount, melting blocky high silicon iron in the normal-pressure medium-frequency induction furnace to form a silicon iron molten pool; the silicon iron liquid in the normal-pressure medium-frequency induction furnace is siphoned into the vacuum magnesium smelting furnace through a siphon system until the silicon iron liquid reaches the preset liquid level height of the vacuum magnesium smelting furnace; and the calcined white powder is sprayed into the silicon iron molten pool of the vacuum magnesium smelting furnace again through the powder spraying system, and the reaction that the silicon iron liquid reduces the calcined white powder to obtain magnesium steam continues to be conducted in the vacuum magnesium smelting furnace, so that continuous production of magnesium metal is achieved. By means of the method, the problems that a traditional magnesium smelting method cannot achieve continuous production and is low in automation degree, low in efficiency and the like can be solved.

Description

Technical Field

[0001] The present invention relates to the field of smelting technology, and more specifically, to a device and method for smelting magnesium by combining a vacuum magnesium smelting furnace with a normal pressure medium frequency induction furnace. Background Art

[0002] my country is a major exporter of raw materials, production capacity and primary magnesium. In 2022, China's primary magnesium production was about 893,600 tons, accounting for about 90% of the global production. At present, the main method of magnesium smelting is the Pidgeon process, which has a small production scale and low efficiency in a single plant, and cannot achieve mechanized and automated production, with high energy consumption and serious pollution.

[0003] The Pidgeon process consists of three stages:

[0004] (1) Dolomite is calcined to obtain calcined white, which is then ground into powder and pressed into briquettes with ferrosilicon and fluorite;

[0005] (2) The material blocks are placed in a vacuum metal furnace tube, evacuated and heated for reduction;

[0006] MgO·CaO(s)+Si(s)→Mg(g)+2CaO·SiO 2 (s)

[0007] (3) The magnesium vapor formed by reduction is cooled and crystallized into crude magnesium at the furnace tube head, and then the slag is refined and cast into ingots.

[0008] Characteristics of the Pidgeon process: wide raw material resources, including coal, oil, natural gas and other energy sources, simple process, low investment, no toxic waste, etc.; but low degree of automation, heavy environmental pollution, large tank loss, low thermal efficiency and production efficiency.

[0009] The magnesium smelting reaction is mainly to obtain magnesium vapor by reducing calcined dolomite with ferrosilicon, in which ferrosilicon serves as the reducing agent of the reaction and calcined dolomite (hereinafter referred to as calcined dolomite) serves as the reduced material.

[0010] The vertical tank technology is an improved process of the Pidgeon process. Its process conditions are the same as those of the Pidgeon process. The reduction tank is changed from a horizontal tank to a vertical tank. The gravity of the material itself is used to achieve rapid feeding and slag removal, thus achieving mechanization and automation. However, with the trial of the vertical tank technology, many new problems were exposed:

[0011] ① The slag sticks to the tank seriously, and automatic slag discharge cannot be achieved;

[0012] ② The pellets are easily broken when adding materials, and the addition is uneven, which affects the reduction rate of magnesium;

[0013] ③ The reduction tank has a shorter lifespan than the horizontal tank, and its cost is higher than the horizontal tank. It is difficult to replace the tank online after it is damaged.

[0014] The method of supplementing the reducing agent ferrosilicon mentioned in patent CN 111270088A is to directly add ferrosilicon. The magnesium smelting reaction actually consumes the silicon element in the ferrosilicon. The original 75% ferrosilicon silicon content continues to decrease with the reaction, but the iron element still exists in the reaction vessel. Under the condition of limited volume of the reaction vessel, directly adding ferrosilicon not only fails to directly obtain 75% ferrosilicon, but also increases and occupies the effective reaction space in the reaction vessel, requiring frequent addition and discharge of materials, which cannot make the reaction efficient and convenient. Summary of the invention

[0015] In view of the above problems, the purpose of the present invention is to provide a device and method for smelting magnesium using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace, so as to solve the problems of low unit yield, high energy consumption and inability to continuous production in the existing magnesium smelting methods.

[0016] The present invention provides a device for smelting magnesium by combining a vacuum magnesium smelting furnace with a normal pressure medium frequency induction furnace, comprising: a powder spraying system, a normal pressure medium frequency induction furnace, a vacuum magnesium smelting furnace, a siphon system for connecting the normal pressure medium frequency induction furnace and the vacuum magnesium smelting furnace, and a slag ladle and a low silicon iron ladle connected to the vacuum magnesium smelting furnace, wherein:

[0017] The powder spraying system is used to spray calcined white powder and slag-making agent into the ferrosilicon molten pool in the vacuum magnesium smelting furnace;

[0018] The normal pressure medium frequency induction furnace is used to heat the lump ferrosilicon to form a ferrosilicon molten pool;

[0019] The siphon system is used to siphon the ferrosilicon solution in the normal pressure medium frequency induction furnace into the vacuum magnesium smelting furnace;

[0020] The vacuum magnesium smelting furnace is used to produce magnesium vapor by utilizing the ferrosilicon liquid in the ferrosilicon melting pool, the calcined white powder and the slag-making agent to produce a reduction reaction;

[0021] The slag and low-silicon iron generated by the reduction reaction in the vacuum magnesium smelting furnace are discharged into the slag tapping ladle and the low-silicon iron tapping ladle respectively.

[0022] In addition, a preferred solution is that the siphon system includes siphon pipes respectively connected to the atmospheric pressure medium frequency induction furnace and the vacuum magnesium smelting furnace, wherein:

[0023] A siphon pipe iron outlet is provided at the bottom of the atmospheric pressure medium frequency induction furnace, and a siphon pipe iron inlet is provided at the middle of the side wall of the vacuum magnesium smelting furnace.

[0024] One end of the siphon pipe is connected to the iron outlet of the siphon pipe, and the other end of the siphon pipe is connected to the iron inlet of the siphon pipe.

[0025] In addition, a preferred solution is that the siphon system further includes a heating device arranged on the periphery of the siphon pipe, wherein:

[0026] The heating device is used to heat and insulate the ferrosilicon liquid in the siphon pipe to prevent the ferrosilicon liquid from condensing while flowing in the siphon pipe.

[0027] In addition, a preferred solution is that a first reaction crucible is provided inside the atmospheric pressure medium frequency induction furnace, wherein:

[0028] A first induction heating coil is arranged outside the first reaction crucible, and the first induction heating coil is used to heat the first reaction crucible so that the block ferrosilicon in the first reaction crucible forms ferrosilicon melt.

[0029] In addition, a preferred solution is that a second reaction crucible is provided inside the vacuum magnesium smelting furnace, wherein:

[0030] A second induction heating coil is arranged outside the second reaction crucible, and the second induction heating coil is used to heat the second reaction crucible so that the block ferrosilicon in the second reaction crucible forms ferrosilicon melt and provides heat for the reaction of the ferrosilicon melt reducing the calcined white powder to produce magnesium vapor.

[0031] The present invention also provides a method for smelting magnesium by using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace. The method comprises: heating the block high silicon iron in the vacuum magnesium smelting furnace to melt the block high silicon iron in the vacuum magnesium smelting furnace to form a ferrosilicon molten pool;

[0032] Spraying calcined white powder and slag-forming agent into the ferrosilicon bath of the vacuum magnesium smelting furnace through a powder spraying system, so that the calcined white powder and the ferrosilicon liquid in the ferrosilicon bath undergo a reduction reaction to produce magnesium vapor, and the magnesium vapor is pumped into a condenser;

[0033] When the ferrosilicon liquid in the vacuum magnesium smelting furnace is consumed to a preset amount, the lump high ferrosilicon in the normal pressure medium frequency induction furnace is heated to melt the lump high ferrosilicon in the normal pressure medium frequency induction furnace to form a ferrosilicon molten pool;

[0034] Siphoning the ferrosilicon liquid in the atmospheric pressure medium frequency induction furnace into the vacuum magnesium smelting furnace through a siphon system until the ferrosilicon liquid reaches a preset liquid level of the vacuum magnesium smelting furnace;

[0035] The powder spraying system is used to spray the calcined white powder and slag-forming agent into the ferrosilicon bath of the vacuum magnesium smelting furnace again, and the reduction reaction is continued in the vacuum magnesium smelting furnace to produce magnesium steam, so as to realize continuous production of magnesium steam.

[0036] In addition, a preferred solution is that before heating the blocky high silicon iron in the vacuum magnesium smelting furnace, the method further comprises:

[0037] Turning on the power of the vacuum magnesium smelting furnace;

[0038] Opening the vacuum system connected to the vacuum magnesium smelting furnace;

[0039] The vacuum magnesium smelting furnace is evacuated by the vacuum system until the gas pressure in the vacuum magnesium smelting furnace reaches 200-1000 Pa.

[0040] In addition, a preferred solution is that during the heating of the block high silicon iron in the vacuum magnesium smelting furnace,

[0041] Slowly heating the second reaction crucible in the vacuum magnesium smelting furnace by a second induction heating coil;

[0042] When the lump high-silicon iron in the second reaction crucible melts to form a ferrosilicon molten pool, the heating power of the second induction heating coil is adjusted so that the temperature of the ferrosilicon molten pool in the vacuum magnesium smelting furnace is maintained at 1450-1500°C.

[0043] In addition, a preferred solution is that during the heating of the lump high silicon iron in the normal pressure medium frequency induction furnace,

[0044] Slowly heating the first reaction crucible in the atmospheric pressure medium frequency induction furnace by a first induction heating coil;

[0045] When the lump high-silicon ferrosilicon in the first reaction crucible melts to form a ferrosilicon molten pool, the heating power of the first induction heating coil is adjusted so that the temperature of the ferrosilicon molten pool in the normal pressure medium frequency induction furnace is maintained at 1350-1450°C.

[0046] In addition, a preferred solution is that in the process of siphoning the ferrosilicon liquid in the atmospheric pressure medium frequency induction furnace into the vacuum magnesium smelting furnace through the siphon system,

[0047] Open the siphon pipe tapping valve of the atmospheric pressure medium frequency induction furnace and the siphon pipe inlet valve of the vacuum magnesium smelting furnace;

[0048] Under the action of pressure difference, the ferrosilicon liquid in the normal pressure medium frequency induction furnace is siphoned into the ferrosilicon molten pool of the vacuum magnesium smelting furnace through a siphon pipe, wherein the ferrosilicon liquid in the siphon pipe is heated by a heating device to prevent the ferrosilicon liquid from condensing while flowing in the siphon pipe;

[0049] When the liquid level of the ferrosilicon molten pool of the vacuum magnesium smelting furnace reaches a preset height, the siphon pipe iron outlet valve of the normal pressure medium frequency induction furnace and the siphon pipe iron inlet valve of the vacuum magnesium smelting furnace are closed.

[0050] From the above technical scheme, it can be seen that the device and method for smelting magnesium by using a vacuum magnesium smelting furnace and a normal-pressure medium-frequency induction furnace provided by the present invention are combined for smelting by a normal-pressure medium-frequency induction furnace and a vacuum magnesium smelting furnace; the normal-pressure medium-frequency induction furnace is used to melt 75% of ferrosilicon, and the vacuum magnesium smelting furnace is replenished with ferrosilicon liquid in time, so that the magnesium smelting reaction can be carried out continuously, thereby improving the speed and efficiency of smelting, extending the smelting cycle time, and avoiding damage to the internal refractory materials caused by frequent opening and closing of equipment.

[0051] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0053] Figure 1 It is a schematic diagram of a device for smelting magnesium using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to an embodiment of the present invention;

[0054] Figure 2 The present invention is a flow chart of a method for smelting magnesium using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to an embodiment of the present invention.

[0055] Reference numerals include:

[0056] 1. Inert gas storage device, 2. First gas delivery pipeline, 3. Second gas delivery pipeline, 4. Calcined white powder spraying tank, 5. Slag-forming agent spraying tank, 6. Powder spraying pipeline, 7. Spray gun, 8. Vacuum magnesium smelting furnace, 9. Splash-proof cover, 10. First reaction crucible, 11. Normal pressure medium frequency induction furnace, 12. Second reaction crucible, 13. Siphon pipeline, 14. Siphon pipeline iron outlet, 15. Siphon pipeline iron inlet, 16. Heating device, 17. Low silicon iron discharge outlet, 18. Low silicon iron iron tapping bag, 19. Slag tapping bag.

[0057] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0058] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0061] In order to illustrate the structure of the device for smelting magnesium using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace provided by the present invention, Figure 1 The structure of a device for smelting magnesium using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to an embodiment of the present invention is shown.

[0062] like Figure 1 As shown, the device for smelting magnesium by combining a vacuum magnesium smelting furnace with a normal-pressure medium-frequency induction furnace provided by the present invention comprises: a powder spraying system, a normal-pressure medium-frequency induction furnace 11, a vacuum magnesium smelting furnace 8, a siphon system for connecting the normal-pressure medium-frequency induction furnace 11 with the vacuum magnesium smelting furnace 8, and a slag ladle 19 and a low-silicon iron ladle 18 connected to the vacuum magnesium smelting furnace 8, wherein the powder spraying system is used to spray calcined white powder and a slag-forming agent into the ferrosilicon molten pool in the vacuum magnesium smelting furnace 8; the normal-pressure medium-frequency induction furnace 1 ... The medium-frequency induction furnace 11 is used to heat the lump ferrosilicon to form a ferrosilicon molten pool; the siphon system is used to siphon the ferrosilicon solution in the atmospheric medium-frequency induction furnace 11 into the vacuum magnesium smelting furnace 8; the vacuum magnesium smelting furnace 8 is used to produce magnesium vapor by utilizing the ferrosilicon liquid, the calcined white powder and the slag-forming agent in the ferrosilicon molten pool to produce a reduction reaction; the slag and low-silicon iron generated by the reduction reaction in the vacuum magnesium smelting furnace 8 are discharged into the slag ladle 19 and the low-silicon iron ladle 18 respectively.

[0063] In an embodiment of the present invention, ferrosilicon liquid is used as a reducing agent in the vacuum magnesium smelting furnace 8 and is continuously consumed. The ferrosilicon liquid in the atmospheric pressure medium frequency induction furnace 11 is continuously replenished into the vacuum magnesium smelting furnace 8 through a siphon system to achieve the purpose of continuous production.

[0064] In an embodiment of the present invention, the siphon system includes a siphon pipe 13 respectively connected to the normal-pressure medium-frequency induction furnace and the vacuum magnesium smelting furnace, wherein a siphon pipe iron outlet 14 is arranged at the bottom of the normal-pressure medium-frequency induction furnace 11, and a siphon pipe iron inlet 15 is arranged in the middle part of the side wall of the vacuum magnesium smelting furnace, one end of the siphon pipe 13 is connected to the siphon pipe iron outlet 14, and the other end of the siphon pipe 13 is connected to the siphon pipe iron inlet 15.

[0065] The siphon system further includes a heating device 16 disposed on the periphery of the siphon pipe, wherein the heating device 16 is used to heat and insulate the ferrosilicon liquid in the siphon pipe to prevent the ferrosilicon liquid from condensing while flowing in the siphon pipe.

[0066] In an embodiment of the present invention, a first reaction crucible 10 is arranged inside the atmospheric pressure medium frequency induction furnace 11, and a first induction heating coil is arranged on the outer side of the first reaction crucible 10, and the first induction heating coil is used to heat the first reaction crucible 10 so that the block ferrosilicon in the first reaction crucible 10 forms ferrosilicon melt.

[0067] A second reaction crucible 12 is arranged inside the vacuum magnesium smelting furnace 8, and a second induction heating coil is arranged on the outer side of the second reaction crucible 12. The second induction heating coil is used to heat the second reaction crucible 12 so that the lump ferrosilicon in the second reaction crucible 12 forms ferrosilicon melt and provides heat for the reaction of reducing the calcined white powder with the ferrosilicon liquid to obtain magnesium vapor.

[0068] A slag outlet is provided on the side wall of the second reaction crucible 12, and the slag generated by the reduction reaction in the second reaction crucible 12 is discharged into the slag outlet 19. A low silicon iron outlet is provided at the bottom of the vacuum magnesium smelting furnace 8, and the low silicon iron generated by the reduction reaction in the second reaction crucible 12 is discharged into the low silicon iron outlet 18.

[0069] In an embodiment of the present invention, the powder spraying system includes an inert gas storage device 1, two gas transmission pipelines, two powder spraying tanks, a powder spraying pipeline 6 and a spray gun 7 which are connected in sequence, wherein the two gas transmission pipelines include a first gas transmission pipeline 2 and a second transmission pipeline 3, and the two powder spraying tanks include a calcined white powder spraying tank 4 for storing calcined white powder and a slag forming agent powder spraying tank 5 for storing a slag forming agent, the first gas transmission pipeline 2 is connected to the calcined white powder spraying tank 4, and the second gas transmission pipeline 3 is connected to the slag forming agent powder spraying tank 5. The inert gas storage device 1 is used to store inert gas and use the inert gas as a carrier for conveying spray powder; the first gas transmission pipeline 2 is used to convey the inert gas to the calcined white powder spray tank 4; the second gas transmission pipeline 3 is used to convey the inert gas to the slag-forming agent powder spray tank 5; the powder spraying pipeline 6 is used to convey the calcined white powder and the slag-forming agent to the spray gun 7; the spray gun 7 is used to spray the calcined white powder and the slag-forming agent into the molten pool of the vacuum magnesium smelting furnace 8.

[0070] A gas delivery valve is provided on the inert gas storage device 1, and the flow rate of the inert gas is adjusted by the gas delivery valve. Powder outlet valves are provided at the bottom of the calcined white powder spraying tank 4 and the slag-forming agent powder spraying tank 5, respectively, and the communication between the calcined white powder spraying tank 4 and the slag-forming agent powder spraying tank 5 and the powder spraying pipeline 6 is controlled by the corresponding powder outlet valves.

[0071] Wherein, pressure gauges are respectively provided on the calcined white powder spraying tank 4 and the slag-forming agent spraying tank 5, and the pressure of the inert gas inside the calcined white powder spraying tank 4 and the slag-forming agent spraying tank 5 is detected by the corresponding pressure gauges. A vacuum furnace cover is provided on the top of the vacuum magnesium smelting furnace 8, and a splash-proof cover 9 is provided on the top of the second reaction crucible 12, and the splash-proof cover 9 is used to prevent the ferrosilicon liquid in the second reaction crucible 12 from splashing. Openings are respectively provided on the vacuum furnace cover and the splash-proof cover 9, and the spray gun 7 extends into the second reaction crucible 12 through the openings.

[0072] Corresponding to the above device, the present invention also provides a method for smelting magnesium by combining a vacuum magnesium smelting furnace with a normal pressure medium frequency induction furnace. Figure 2 The method flow of smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to an embodiment of the present invention is shown.

[0073] like Figure 2 As shown, the method for smelting magnesium by using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace provided by the present invention uses the above-mentioned device for smelting magnesium by using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace to smelt magnesium, comprising: S1: heating the block high silicon iron in the vacuum magnesium smelting furnace to melt the block high silicon iron in the vacuum magnesium smelting furnace to form a ferrosilicon molten pool;

[0074] S2: spraying calcined white powder and slag-forming agent into the ferrosilicon bath of the vacuum magnesium smelting furnace through a powder spraying system, so that the calcined white powder reacts with the ferrosilicon liquid in the ferrosilicon bath to generate magnesium vapor, and the magnesium vapor is pumped into a condenser;

[0075] S3: When the ferrosilicon liquid in the vacuum magnesium smelting furnace is consumed to a preset amount, the lump high ferrosilicon in the normal pressure medium frequency induction furnace is heated to melt the lump high ferrosilicon in the normal pressure medium frequency induction furnace to form a ferrosilicon molten pool;

[0076] S4: siphoning the ferrosilicon liquid in the atmospheric pressure medium frequency induction furnace into the vacuum magnesium smelting furnace through a siphon system until the ferrosilicon liquid reaches a preset liquid level of the vacuum magnesium smelting furnace;

[0077] S5: spraying the calcined white powder and slag-forming agent into the ferrosilicon bath of the vacuum magnesium smelting furnace again through the powder spraying system, and continuing the reduction reaction in the vacuum magnesium smelting furnace to generate magnesium vapor, so as to realize continuous production of magnesium vapor.

[0078] In an embodiment of the present invention, before heating the lump high-silicon iron in the vacuum magnesium smelting furnace, it also includes: turning on the power of the vacuum magnesium smelting furnace; turning on the vacuum system connected to the vacuum magnesium smelting furnace; and evacuating the vacuum magnesium smelting furnace through the vacuum system until the air pressure in the vacuum magnesium smelting furnace reaches 200-1000Pa.

[0079] In step S1, during the process of heating the lump high silicon iron in the vacuum magnesium smelting furnace, the second reaction crucible in the vacuum magnesium smelting furnace is slowly heated by the second induction heating coil; when the lump high silicon iron in the second reaction crucible melts to form a ferrosilicon molten pool, the heating power of the second induction heating coil is adjusted so that the temperature of the ferrosilicon molten pool in the vacuum magnesium smelting furnace is maintained at 1450-1500°C.

[0080] In step S3, during the process of heating the lump high silicon iron in the normal pressure medium frequency induction furnace, the first reaction crucible in the normal pressure medium frequency induction furnace is slowly heated by the first induction heating coil; when the lump high silicon iron in the first reaction crucible melts to form a ferrosilicon molten pool, the heating power of the first induction heating coil is adjusted so that the temperature of the ferrosilicon molten pool in the normal pressure medium frequency induction furnace is maintained at 1350-1450°C.

[0081] In step S4, in the process of siphoning the ferrosilicon liquid in the normal-pressure medium-frequency induction furnace into the vacuum magnesium-smelting furnace through the siphon system, the iron outlet valve of the siphon pipe of the normal-pressure medium-frequency induction furnace and the iron inlet valve of the siphon pipe of the vacuum magnesium-smelting furnace are opened; under the action of the pressure difference, the ferrosilicon liquid in the normal-pressure medium-frequency induction furnace is siphoned into the ferrosilicon molten pool of the vacuum magnesium-smelting furnace through the siphon pipe, wherein the ferrosilicon liquid in the siphon pipe is heated by a heating device to prevent the ferrosilicon liquid from condensing during the flow in the siphon pipe; when the liquid level of the ferrosilicon molten pool of the vacuum magnesium-smelting furnace reaches a preset height, the iron outlet valve of the siphon pipe of the normal-pressure medium-frequency induction furnace and the iron inlet valve of the siphon pipe of the vacuum magnesium-smelting furnace are closed.

[0082] In a specific embodiment of the present invention, at the beginning of production, a proper amount of blocky 75% ferrosilicon is first placed in the normal pressure medium frequency induction furnace and the vacuum magnesium smelting furnace, and the siphon pipe iron outlet valve and the iron inlet valve are kept closed. The vacuum magnesium smelting furnace power supply is turned on, the vacuum system is turned on, and when the vacuum is evacuated to 200-1000Pa, the heating power supply of the vacuum magnesium smelting furnace is turned on, and the heating power is slowly increased. After the blocky 75% ferrosilicon in the vacuum magnesium smelting furnace is completely melted to form a molten pool, the heating power is adjusted to keep the temperature between 1450-1500°C, the inert gas storage device is turned on, the inert gas delivery valve is opened, and the inert gas (argon) enters the calcined white powder spraying tank and the slag-forming agent spraying tank through the gas delivery pipeline. When the calcined white powder spraying tank and the slag-forming agent spraying tank are filled, the powder outlet valves at the bottom of the calcined white powder spraying tank and the slag-forming agent spraying tank are opened, and the argon gas, calcined white powder, slag-forming agent, etc. are sprayed into the ferrosilicon molten pool in the second reaction crucible together, and the reaction of ferrosilicon reducing calcined white to produce magnesium vapor is started; and the generated magnesium vapor is pumped into the magnesium vapor condenser along with the vacuum system.

[0083] When the vacuum magnesium smelting furnace is evacuated, turn on the heating power of the atmospheric pressure medium frequency induction furnace, start heating, slowly increase the heating power, wait for the block 75% ferrosilicon in the atmospheric pressure medium frequency induction furnace to completely melt to form a molten pool, adjust the power to keep the temperature at about 1350-1450 degrees Celsius.

[0084] When the silicon content in the vacuum magnesium smelting furnace drops to 25% or below, the powder spraying system is closed, and the siphon pipe iron outlet valve and the iron inlet valve are opened. Under the action of the pressure difference, the ferrosilicon liquid in the normal pressure medium frequency induction furnace enters the vacuum magnesium smelting furnace through the siphon pipe to replenish the reducing agent of the magnesium smelting reaction. When the liquid level is replenished to a certain level, the siphon pipe iron outlet valve and the iron inlet valve are closed. Among them, the siphon pipe has a heating device outside the siphon pipe at the connection between the two furnaces to prevent the ferrosilicon liquid from condensing during the flow; the powder spraying system is opened to continue the magnesium smelting reaction, and the generated magnesium vapor is pumped to the crystallizer for crystallization, and the generated magnesium slag is continuously discharged into the slag bag. This cycle is repeated until the low-concentration ferrosilicon liquid level increases to the siphon pipe iron outlet, and the powder spraying system is closed to discharge the low-concentration ferrosilicon liquid into the iron outlet bag, and a reaction cycle ends.

[0085] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A device for smelting magnesium by combining a vacuum magnesium smelting furnace with a normal pressure medium frequency induction furnace, characterized in that: include: A powder spraying system, a normal pressure medium frequency induction furnace, a vacuum magnesium smelting furnace, a siphon system for connecting the normal pressure medium frequency induction furnace and the vacuum magnesium smelting furnace, and a slag ladle and a low silicon iron ladle connected to the vacuum magnesium smelting furnace, wherein: The powder spraying system is used to spray calcined white powder and slag-making agent into the ferrosilicon molten pool in the vacuum magnesium smelting furnace; The normal pressure medium frequency induction furnace is used to heat the lump ferrosilicon to form a ferrosilicon molten pool; The siphon system is used to siphon the ferrosilicon solution in the normal pressure medium frequency induction furnace into the vacuum magnesium smelting furnace; The vacuum magnesium smelting furnace is used to produce magnesium vapor by utilizing the ferrosilicon liquid in the ferrosilicon melting pool, the calcined white powder and the slag-making agent to produce a reduction reaction; The slag and low-silicon iron generated by the reduction reaction in the vacuum magnesium smelting furnace are discharged into the slag tapping ladle and the low-silicon iron tapping ladle respectively.

2. The device for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 1, characterized in that: The siphon system comprises siphon pipes respectively connected to the atmospheric pressure medium frequency induction furnace and the vacuum magnesium smelting furnace, wherein: A siphon pipe iron outlet is provided at the bottom of the atmospheric pressure medium frequency induction furnace, and a siphon pipe iron inlet is provided at the middle of the side wall of the vacuum magnesium smelting furnace. One end of the siphon pipe is connected to the iron outlet of the siphon pipe, and the other end of the siphon pipe is connected to the iron inlet of the siphon pipe.

3. The device for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 2, characterized in that: The siphon system further comprises a heating device arranged on the periphery of the siphon pipe, wherein: The heating device is used to heat and insulate the ferrosilicon liquid in the siphon pipe to prevent the ferrosilicon liquid from condensing while flowing in the siphon pipe.

4. The device for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 1, characterized in that: A first reaction crucible is arranged inside the atmospheric pressure medium frequency induction furnace, wherein: A first induction heating coil is arranged outside the first reaction crucible, and the first induction heating coil is used to heat the first reaction crucible so that the block ferrosilicon in the first reaction crucible forms ferrosilicon melt.

5. The device for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 1, characterized in that: A second reaction crucible is arranged inside the vacuum magnesium smelting furnace, wherein: A second induction heating coil is arranged outside the second reaction crucible, and the second induction heating coil is used to heat the second reaction crucible so that the block ferrosilicon in the second reaction crucible forms ferrosilicon melt, and at the same time provides heat for the reaction of the calcined white powder with the ferrosilicon melt to generate magnesium vapor.

6. A method for smelting magnesium by combining a vacuum magnesium smelting furnace with a normal pressure medium frequency induction furnace, characterized in that: The method of smelting magnesium using a device for smelting magnesium using a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace as described in any one of claims 1 to 5 comprises: Heating the lump high silicon iron in the vacuum magnesium smelting furnace to melt the lump high silicon iron in the vacuum magnesium smelting furnace to form a ferrosilicon molten pool; Spraying calcined white powder and slag-forming agent into the ferrosilicon bath of the vacuum magnesium smelting furnace through a powder spraying system, so that the calcined white powder reacts with the ferrosilicon liquid in the ferrosilicon bath to generate magnesium vapor, and the magnesium vapor is pumped into a condenser; When the ferrosilicon liquid in the vacuum magnesium smelting furnace is consumed to a preset amount, the lump high ferrosilicon in the normal pressure medium frequency induction furnace is heated to melt the lump high ferrosilicon in the normal pressure medium frequency induction furnace to form a ferrosilicon molten pool; Siphoning the ferrosilicon liquid in the atmospheric pressure medium frequency induction furnace into the vacuum magnesium smelting furnace through a siphon system until the ferrosilicon liquid reaches a preset liquid level of the vacuum magnesium smelting furnace; The calcined white powder and slag-forming agent are sprayed again into the ferrosilicon bath of the vacuum magnesium smelting furnace through the powder spraying system, and the reduction reaction continues to generate magnesium vapor in the vacuum magnesium smelting furnace to realize continuous production of magnesium vapor.

7. The method for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 6, characterized in that: Before heating the lump high silicon iron in the vacuum magnesium smelting furnace, the method further comprises: Turning on the power of the vacuum magnesium smelting furnace; Opening the vacuum system connected to the vacuum magnesium smelting furnace; The vacuum magnesium smelting furnace is evacuated by the vacuum system until the gas pressure in the vacuum magnesium smelting furnace reaches 200-1000 Pa.

8. The method for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 6, characterized in that: During the heating process of the lump high silicon iron in the vacuum magnesium furnace, Slowly heating the second reaction crucible in the vacuum magnesium smelting furnace by a second induction heating coil; When the lump high-silicon iron in the second reaction crucible melts to form a ferrosilicon molten pool, the heating power of the second induction heating coil is adjusted so that the temperature of the ferrosilicon molten pool in the vacuum magnesium smelting furnace is maintained at 1450-1500°C.

9. The method for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 6, characterized in that: In the process of heating the lump high silicon iron in the normal pressure medium frequency induction furnace, Slowly heating the first reaction crucible in the atmospheric pressure medium frequency induction furnace by a first induction heating coil; When the lump high-silicon ferrosilicon in the first reaction crucible melts to form a ferrosilicon molten pool, the heating power of the first induction heating coil is adjusted so that the temperature of the ferrosilicon molten pool in the normal pressure medium frequency induction furnace is maintained at 1350-1450°C.

10. The method for smelting magnesium by combining a vacuum magnesium smelting furnace and a normal pressure medium frequency induction furnace according to claim 6, characterized in that: In the process of siphoning the ferrosilicon liquid in the atmospheric pressure medium frequency induction furnace into the vacuum magnesium smelting furnace through the siphon system, Open the siphon pipe tapping valve of the atmospheric pressure medium frequency induction furnace and the siphon pipe inlet valve of the vacuum magnesium smelting furnace; Under the action of pressure difference, the ferrosilicon liquid in the normal pressure medium frequency induction furnace is siphoned into the ferrosilicon molten pool of the vacuum magnesium smelting furnace through a siphon pipe, wherein the ferrosilicon liquid in the siphon pipe is heated by a heating device to prevent the ferrosilicon liquid from condensing while flowing in the siphon pipe; When the liquid level of the ferrosilicon molten pool of the vacuum magnesium smelting furnace reaches a preset height, the siphon pipe iron outlet valve of the normal pressure medium frequency induction furnace and the siphon pipe iron inlet valve of the vacuum magnesium smelting furnace are closed.

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