Device and method for producing ferro-silicon-aluminum by using magnesium smelting residual ferrosilicon liquid

Abstract

The invention provides a device and a method for producing ferro-silicon-aluminum by using magnesium smelting residual ferrosilicon liquid. The method comprises the following steps: crushing waste aluminum blocks and waste silicon blocks into waste aluminum powder and waste silicon powder with preset granularity; conveying the waste aluminum powder and the waste silicon powder to a feeding system; the waste aluminum powder and the waste silicon powder are sprayed into a magnesium smelting residual silicon iron molten pool of a vacuum reaction system through the feeding system; the waste aluminum powder, the waste silicon powder and the low-silicon iron solution in the magnesium smelting residual silicon iron molten pool are subjected to alloying treatment through the vacuum alloying system, and silicon aluminum iron is generated; and the ferro-silicon-aluminum is treated through a tapping system, and a ferro-silicon-aluminum product is obtained. By utilizing the method, the problems of harm to the body, environmental pollution, low utilization rate and the like of the existing generation method 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 producing ferrosilicon by utilizing residual ferrosilicon liquid from magnesium smelting. Background Art

[0002] At present, the production methods of magnesium metal are mainly divided into two categories: electrolysis and thermal reduction. Among them, due to the difficulty in overcoming environmental problems in the electrolysis method, less than 20% of the global magnesium metal production is produced by electrolysis, and most of the remaining magnesium metal is obtained by smelting by thermal reduction. The main process of thermal reduction is silicon thermal reduction, that is, using silicon as a reducing agent to reduce magnesium oxide, obtaining magnesium metal vapor under high temperature and vacuum conditions, and then condensing to obtain solid magnesium. Among them, the mainstream is the Pijiang process.

[0003] (1) Pidgeon method

[0004] The Pijiang process of magnesium smelting refers to a method of thermal reduction of magnesium smelting in which calcined dolomite is reduced to metallic magnesium using a ferrosilicon reducing agent in a reduction furnace with material added to the reduction tank and heated outside the tank. It consumes more than 10 tons of dolomite for every ton of metallic magnesium produced, and 1-1.05 tons of ferrosilicon are consumed for every ton of metallic magnesium produced. During production, these ferrosilicon are also completely converted into solid waste and discharged along with the reduction slag. In actual production, one ton of magnesium produces 6-7 tons of reduction slag. Taking 2019 as an example, the cumulative amount of magnesium slag in the country was 4.5-6.3 million tons, and Yulin alone discharged nearly 3 million tons. With the continuous expansion of the world magnesium metal market, this data will continue to increase. In addition, its single-plant production scale is small and inefficient, and it is impossible to achieve mechanized and automated production, with high energy consumption and serious pollution.

[0005] In addition, France has developed a semi-continuous slag conductive silicon thermal reduction process (Magnetherm Process) and achieved industrialization.

[0006] (2) French Magnetherm Process

[0007] 2(CaO·MgO)(s)+SiFe(s)+0.3Al2O3(s)=2Mg(g)+2CaO·SiO2·0.3Al2O3(l)+

[0008] Fe(l)

[0009] Ferrosilicon, fluorite, calcined dolomite and bauxite are added to the equipment with graphite electrode heating under vacuum. The molten slag is heated by the conductive resistance of the molten slag and the graphite electrode arc. The Al2O3 content can be adjusted to adjust the conductivity of the slag and effectively inhibit the carbon thermal reduction reaction. Ferrosilicon, calcined dolomite and other furnace materials are melted into slag. The raw materials undergo slag-metal reaction in the liquid slag. The generated magnesium vapor is collected in the condenser, and the generated slag and residual ferrosilicon are periodically discharged through the slag outlet and iron outlet respectively.

[0010] Among them, the Magnetherm method has a high reduction rate, a short reduction time and a high production efficiency. Its main technical problem is that the vacuum sealing problem of the high-temperature electrode has not been solved. The air inhaled at the seal burns with the newly generated magnesium vapor. When the leakage is large, a local explosion occurs, resulting in poor safety, magnesium metal purity is not as good as the Pijiang method, and there is no cost advantage.

[0011] In summary, whether it is the Pidgeon process or the French "Magnim process", the residual ferrosilicon (18-22% SiFe) after smelting has not been effectively utilized. In particular, the Pidgeon process, the mainstream magnesium smelting process, has residual ferrosilicon discharged as waste along with the slag, dumped in wasteland or deep trench landfill, and a large amount of magnesium slag accumulation causes the following problems: ① The magnesium slag is pulverized during the natural cooling process, and a large amount of dust is suspended, causing air pollution and threatening health; ② The magnesium slag landfill occupies a large amount of land and is prone to secondary hazards, such as soil salinization, soil compaction and landslides and other geological disasters; ③ The magnesium smelting process may cause the enrichment of polluting elements in the magnesium slag, which has the risk of causing soil and groundwater pollution; ④ Enterprises need to pay taxes to the government according to the amount of solid waste emissions, and the discharge of magnesium slag obviously increases the burden on enterprises. Summary of the invention

[0012] In view of the above problems, the purpose of the present invention is to provide a device and method for producing ferrosilicon-aluminum-iron using residual ferrosilicon liquid from magnesium smelting, aiming to carry out secondary and efficient recycling of iron and silicon resources to solve the problems of existing production methods such as harm to the body, pollution of the environment and low utilization.

[0013] The present invention provides a device for producing ferrosilicon-aluminum-iron by using residual ferrosilicon liquid from magnesium smelting, comprising: a feeding system, a vacuum alloying system and an iron tapping system.

[0014] The feeding system is used to add charge to the vacuum alloying system, wherein the charge includes waste aluminum powder and waste silicon powder;

[0015] The vacuum reaction system is used to perform vacuum alloying treatment on the added furnace charge and the residual ferrosilicon liquid from magnesium smelting in the vacuum reaction system to generate ferrosilicon-aluminum;

[0016] The iron-discharging system is used to process the silicon-aluminum-iron generated by the vacuum alloying system to obtain the silicon-aluminum-iron.

[0017] In addition, a preferred solution is that the vacuum reaction system comprises: a vacuum tank, a spray gun mechanism vacuum chamber connected to the vacuum tank, and a spray gun arranged in the spray gun mechanism vacuum chamber, wherein:

[0018] The spray gun mechanism vacuum chamber is connected to the feeding system, and the feeding system transports the waste aluminum powder and waste silicon powder into the spray gun mechanism vacuum chamber;

[0019] The spray gun is used to spray the waste aluminum powder and waste silicon powder into the liquid ferrosilicon in the iron ladle of the vacuum tank.

[0020] In addition, a preferred solution is that the vacuum alloying system further comprises: a spray gun lifter arranged in the vacuum chamber of the spray gun mechanism, wherein:

[0021] The spray gun lifter is connected to the spray gun, and the spray gun moves into the liquid ferrosilicon in the vacuum tank under the action of the spray gun lifter.

[0022] In addition, a preferred solution is that a graphite crucible is arranged in the vacuum tank, and the graphite crucible is fixed to the vacuum tank through a bracket;

[0023] A splash-proof cover is arranged on the upper part of the graphite crucible, a vacuum tank cover is arranged on the vacuum tank, and the vacuum tank cover is arranged above the splash-proof cover.

[0024] In addition, a preferred solution is that openings are respectively provided on the vacuum tank cover and the splash-proof cover, and the spray gun extends into the graphite crucible of the vacuum tank through the openings.

[0025] In addition, a preferred solution is that the iron tapping system includes an iron tapping port arranged on one side of the graphite crucible, and the silicon-aluminum-iron is obtained from the graphite crucible through the iron tapping port.

[0026] The present invention also provides a method for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting, comprising:

[0027] Crushing waste aluminum blocks and waste silicon blocks into waste aluminum powder and waste silicon powder of preset particle sizes;

[0028] conveying the waste aluminum powder and waste silicon powder to a feeding system;

[0029] The waste aluminum powder and waste silicon powder are sprayed into the magnesium smelting residual ferrosilicon molten pool of the vacuum reaction system through the feeding system;

[0030] Alloying the waste aluminum powder, the waste silicon powder and the low-silicon ferrosilicon solution in the magnesium smelting residual ferrosilicon molten pool by the vacuum alloying system to generate ferrosilicon-aluminum;

[0031] The ferrosilicon-aluminum is processed by a tapping system to obtain ferrosilicon-aluminum products.

[0032] In addition, a preferred solution is that the preset particle size of the waste aluminum powder and waste silicon powder is 0.5-5 mm.

[0033] In addition, a preferred solution is that the feeding system adopts a vacuum sealing system to provide a stable pressure for conveying the waste aluminum powder and the waste silicon powder.

[0034] In addition, a preferred solution is that in the process of alloying the waste aluminum powder, the waste silicon powder and the low-silicon ferrosilicon solution in the magnesium smelting residual ferrosilicon molten pool through the vacuum alloying system, the alloying treatment temperature is 1300°C-1550°C and the insulation time is 6-12 minutes.

[0035] In addition, a preferred solution is that, in the vacuum alloying system, a spray gun is inserted into the low-silicon iron solution, and the waste aluminum powder and waste silicon powder are sprayed into the low-silicon iron solution using argon as a carrier, so that the waste aluminum powder and waste silicon powder undergo an alloying reaction with the low-silicon iron.

[0036] From the above technical scheme, it can be seen that the device and method for producing ferrosilicon-aluminum-iron using residual ferrosilicon liquid from magnesium smelting provided by the present invention will take the high-concentration silicon (35-95% SiFe) to be 15-35% SiFe after magnesium smelting, and alloy the low-silicon ferrosilicon liquid (15-35% SiFe) with waste aluminum and waste silicon to obtain ferrosilicon-aluminum-iron alloy. The present invention uses the residual ferrosilicon liquid from magnesium smelting to smelt ferrosilicon-aluminum-iron, so that the ferrosilicon raw materials are fully utilized, the reaction efficiency is high, and the iron and silicon resources are recycled and utilized efficiently for the second time.

[0037] 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

[0038] 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:

[0039] Figure 1Schematic diagram of a device for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting according to an embodiment of the present invention;

[0040] Figure 2 The present invention is a flow chart of a method for producing ferrosilicon-aluminum by utilizing residual ferrosilicon liquid from magnesium smelting according to an embodiment of the present invention.

[0041] Reference numerals include:

[0042] 1. Injection feeding system, 2. Vacuum feeding silo, 3. Vacuum feeder, 4. Operating platform, 5. Vacuum alloying system, 6. Iron tapping system, 7. Siphon slag tapping system.

[0043] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] In order to illustrate the structure of the device for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting provided by the present invention, Figure 1 The structure of a device for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting according to an embodiment of the present invention is shown.

[0048] like Figure 1As shown, the device for producing ferrosilicon using residual ferrosilicon liquid from magnesium smelting provided by the present invention comprises: a feeding system, a vacuum alloying system 5, an iron tapping system 6 and a siphon slag tapping system 7, wherein the feeding system is used to add charge to the vacuum alloying system 5, and the charge comprises waste aluminum powder and waste silicon powder; the vacuum reaction system 5 is used to perform vacuum alloying treatment on the added charge and the residual ferrosilicon liquid from magnesium smelting in the vacuum reaction system 5 to generate ferrosilicon; wherein the iron tapping system 6 is used to process the ferrosilicon generated by the vacuum alloying system to obtain the ferrosilicon; the siphon slag tapping system 7 is used to process the slag generated in the vacuum alloying system.

[0049] In an embodiment of the present invention, the feeding system includes a blowing feeding system 1 and a vacuum feeding system, wherein the blowing feeding system 1 is used to provide the waste aluminum powder and waste silicon powder to the interior of the vacuum alloying system. The feeding system also includes a vacuum feeding system, which includes: an operating platform 4, a vacuum feeder 3 and a vacuum feeding bin 2 arranged on the operating platform 4, wherein the operating platform 4 is fixed to the vacuum alloying system 5, wherein the waste aluminum powder and waste silicon powder are stored in the vacuum feeding bin 2, and the waste aluminum powder and waste silicon powder in the vacuum feeding bin 2 are added to the interior of the vacuum reaction system 5 through the vacuum feeder 3.

[0050] In an embodiment of the present invention, the vacuum reaction system 5 comprises: a vacuum tank, a spray gun mechanism vacuum chamber connected to the vacuum tank, and a spray gun arranged in the spray gun mechanism vacuum chamber, wherein the spray gun mechanism vacuum chamber is connected to the feeding system, and the feeding system transports the waste aluminum powder and waste silicon powder to the spray gun mechanism vacuum chamber; the spray gun is used to spray the waste aluminum powder and waste silicon powder into the liquid ferrosilicon in the iron ladle of the vacuum tank. The spray gun is inserted into the liquid high-temperature ferrosilicon in the iron ladle of the vacuum tank, and the waste aluminum powder and waste silicon powder are sprayed into the ferrosilicon with argon as a carrier, and the waste aluminum powder and waste silicon powder are alloyed with the ferrosilicon.

[0051] The vacuum alloying system 5 further comprises: a spray gun lifter arranged in the vacuum chamber of the spray gun mechanism, wherein the spray gun lifter is connected to the spray gun, and the spray gun moves into the liquid ferrosilicon in the vacuum tank under the action of the spray gun lifter.

[0052] A high-temperature insulation layer and a refractory material layer are sequentially arranged on the periphery of the spray gun from the inside to the outside, wherein a blow pipe is arranged on the spray gun, and the blow pipe is made of wear-resistant and high-temperature resistant metal material; the refractory material layer is graphite or magnesium oxide wrapped boron nitride film.

[0053] In an embodiment of the present invention, a graphite crucible is arranged in the vacuum tank, and the graphite crucible is fixed to the vacuum tank by a bracket; a splash cover is arranged on the upper part of the graphite crucible, and a vacuum tank cover is arranged on the vacuum tank, and the vacuum tank cover is arranged above the splash cover. Openings are respectively arranged on the vacuum tank cover and the splash cover, and the spray gun extends into the vacuum tank through the openings and finally reaches the graphite crucible. The heating method of the graphite crucible is induction heating.

[0054] In an embodiment of the present invention, a spray gun is inserted into the molten pool of a graphite crucible by a vacuum tank cover and the splash-proof cover, and powder is sprayed into the graphite crucible from the top. The stirring force of the sprayed mixed fluid on the molten pool and the stirring force of the electromagnetic induction on the molten pool are coupled with each other to form a flow field that suppresses splashing, which can not only prolong the residence time of the reduced powder in the melt and increase the reaction rate, but also prevent the solution and slag in the molten pool from splashing; a small amount of splashing can be blocked in the graphite crucible by the splash-proof cover.

[0055] In the present invention, the iron tapping system 6 comprises an iron tapping port arranged at one side of the graphite crucible, and the silicon-aluminum-iron is obtained from the graphite crucible through the iron tapping port.

[0056] In addition, a slag overflow trough is provided on the side wall of the graphite crucible, and the siphon slag discharge system 7 is connected to the slag overflow trough; the slag in the slag overflow trough is discharged into the slag tank car through the siphon slag discharge system. That is, the siphon slag discharge system is welded to the side wall of the vacuum tank, and is connected to the slag overflow trough welded on the side wall of the graphite crucible. The slag is discharged into the vacuum siphon slag discharge pipeline through the slag overflow trough, and is directly discharged into the slag tank placed in the atmosphere, and is removed by the slag tank car.

[0057] Corresponding to the above device, the present invention also provides a method for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting. Figure 2 The present invention shows a method for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting according to an embodiment of the present invention.

[0058] like Figure 2 As shown, the method for producing ferrosilicon-aluminum-iron by using residual ferrosilicon liquid from magnesium smelting provided by the present invention comprises: S1: crushing waste aluminum blocks and waste silicon blocks into waste aluminum powder and waste silicon powder of preset particle sizes;

[0059] S2: transporting the waste aluminum powder and waste silicon powder to a feeding system;

[0060] S3: spraying the waste aluminum powder and waste silicon powder into the magnesium smelting residual ferrosilicon molten pool of the vacuum reaction system through the feeding system;

[0061] S4: alloying the waste aluminum powder, the waste silicon powder and the low-silicon ferrosilicon solution in the residual ferrosilicon bath from magnesium smelting by the vacuum alloying system to generate ferrosilicon-aluminum;

[0062] S5: Processing the ferrosilicon-aluminum through a tapping system to obtain ferrosilicon-aluminum products.

[0063] First, high-concentration silicon (35-95% SiFe) is smelted using a new liquid magnesium smelting technology using a blowing method, and then the present invention mixes its low-silicon iron liquid (15-35% SiFe) with waste aluminum and waste silicon to alloy and obtain silicon-aluminum-iron.

[0064] In step S1, the preset particle size of the waste aluminum powder and waste silicon powder is 0.5-5 mm.

[0065] In step S2, the feeding system adopts a vacuum sealing system to provide a stable pressure for conveying the waste aluminum powder and the waste silicon powder, that is, the vacuum sealing system isolates the outside air and stabilizes the pressure in the feeding system.

[0066] In step S3, in the process of alloying the waste aluminum powder, the waste silicon powder and the low-silicon ferrosilicon solution in the magnesium smelting residual ferrosilicon molten pool by the vacuum alloying system, the alloying treatment temperature is 1300° C.-1550° C., and the insulation time is 6-12 minutes.

[0067] In the vacuum alloying system, the vacuum alloying system includes: a vacuum tank, an induction heating graphite crucible placed in the vacuum tank and a splash cover placed on the top of the graphite crucible, a spray gun mechanism vacuum chamber connected to the vacuum tank, and a spray gun arranged in the spray gun mechanism vacuum chamber, wherein the spray gun is inserted into the residual ferrosilicon molten pool in the graphite crucible, and waste aluminum powder and waste silicon powder are sprayed into the residual ferrosilicon molten pool using argon as a carrier, so that the waste aluminum powder and waste silicon powder undergo an alloying reaction with the low-silicon iron.

[0068] In the present invention, the aluminum content of the scrap aluminum is ≥95%, the silicon content of the scrap silicon is ≥96%, and the added amounts of the scrap aluminum and scrap silicon will be formulated into corresponding common silicon-aluminum-iron grades on the market according to the concentration of residual ferrosilicon, such as FeAl32Si25, FeAl30Si20, FeAl42Si15, etc.

[0069] 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 producing ferrosilicon-aluminum-iron using residual ferrosilicon liquid from magnesium smelting, characterized in that: include: Feeding system, vacuum alloying system and iron tapping system, The feeding system is used to add charge to the vacuum alloying system, wherein the charge includes waste aluminum powder and waste silicon powder; The vacuum reaction system is used to perform vacuum alloying treatment on the added furnace charge and the residual ferrosilicon liquid from magnesium smelting in the vacuum reaction system to generate ferrosilicon-aluminum; The iron-discharging system is used to process the silicon-aluminum-iron generated by the vacuum alloying system to obtain the silicon-aluminum-iron.

2. The device for producing ferrosilicon-aluminum-iron by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 1, characterized in that: The vacuum reaction system comprises: a vacuum tank, a spray gun mechanism vacuum chamber connected to the vacuum tank, and a spray gun arranged in the spray gun mechanism vacuum chamber, wherein: The spray gun mechanism vacuum chamber is connected to the feeding system, and the feeding system transports the waste aluminum powder and waste silicon powder into the spray gun mechanism vacuum chamber; The spray gun is used to spray the waste aluminum powder and waste silicon powder into the liquid ferrosilicon in the iron ladle of the vacuum tank.

3. The device for producing ferrosilicon-aluminum-iron by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 2, characterized in that: The vacuum alloying system further comprises: a spray gun lifter arranged in the vacuum chamber of the spray gun mechanism, wherein: The spray gun lifter is connected to the spray gun, and the spray gun moves into the liquid ferrosilicon in the vacuum tank under the action of the spray gun lifter.

4. The device for producing ferrosilicon-aluminum-iron by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 3, characterized in that: A graphite crucible is arranged in the vacuum tank, and the graphite crucible is fixed on the vacuum tank through a bracket; A splash-proof cover is arranged on the upper part of the graphite crucible, a vacuum tank cover is arranged on the vacuum tank, and the vacuum tank cover is arranged above the splash-proof cover.

5. The device for producing ferrosilicon-aluminum-iron by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 4, characterized in that: The vacuum tank cover and the splash-proof cover are respectively provided with openings, and the spray gun extends into the graphite crucible of the vacuum tank through the openings.

6. The device for producing ferrosilicon-aluminum-iron by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 4, characterized in that: The iron tapping system comprises an iron tapping port arranged at one side of the graphite crucible, and the silicon-aluminum-iron is obtained from the graphite crucible through the iron tapping port.

7. A method for producing ferrosilicon-aluminum by using residual ferrosilicon liquid from magnesium smelting, characterized in that: include: Crushing waste aluminum blocks and waste silicon blocks into waste aluminum powder and waste silicon powder of preset particle sizes; conveying the waste aluminum powder and waste silicon powder to a feeding system; The waste aluminum powder and waste silicon powder are sprayed into the magnesium smelting residual ferrosilicon molten pool of the vacuum reaction system through the feeding system; Alloying the waste aluminum powder, the waste silicon powder and the low-silicon ferrosilicon solution in the residual ferrosilicon bath from magnesium smelting by the vacuum alloying system to generate ferrosilicon-aluminum; The ferrosilicon-aluminum is processed by a tapping system to obtain ferrosilicon-aluminum products.

8. The method for producing ferrosilicon-aluminum by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 7, characterized in that: The preset particle size of the waste aluminum powder and waste silicon powder is 0.5-5 mm.

9. The method for producing ferrosilicon-aluminum by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 7, characterized in that: The feeding system adopts a vacuum sealing system to provide stable pressure for conveying the waste aluminum powder and the waste silicon powder.

10. The method for producing ferrosilicon-aluminum by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 7, characterized in that: In the process of alloying the waste aluminum powder, the waste silicon powder and the low-silicon ferrosilicon solution in the magnesium smelting residual ferrosilicon molten pool by the vacuum alloying system, the alloying treatment temperature is 1300° C.-1550° C. and the insulation time is 6-12 minutes.

11. The method for producing ferrosilicon-aluminum by utilizing residual ferrosilicon liquid from magnesium smelting according to claim 10, characterized in that: In the vacuum alloying system, a spray gun is inserted into the low-silicon iron solution, and the waste aluminum powder and waste silicon powder are sprayed into the low-silicon iron solution using argon as a carrier, so that the waste aluminum powder and waste silicon powder undergo an alloying reaction with the low-silicon iron.

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