A renewable energy magnesium smelting system and method thereof

Abstract

The application discloses a renewable energy magnesium smelting system and method, and relates to the field of smelting magnesium metal; the system comprises a magnesium reduction furnace arranged vertically; a graphite cylinder is arranged in the magnesium reduction furnace; graphite pipes are connected to the two ends of the graphite cylinder; the graphite pipes are communicated with a silicon-thermal heat storage system after passing through heat exchangers; molten liquid silicon is arranged in the silicon-thermal heat storage system; the silicon-thermal heat storage system is connected with a wind power generation system, a photovoltaic power generation system and an iron-air battery energy storage system through an intelligent comprehensive power supply coordination control system; the magnesium reduction furnace is used for placing magnesium-containing pellets; a crystallizer is fixedly arranged above the magnesium reduction furnace; a water cooling device is arranged on the crystallizer; and a vacuum pump is communicated with the top of the crystallizer. The magnesium smelting method based on the system directly uses renewable energy, uses magnesium oxide as raw material, and avoids environmental pollution; and the vertically arranged magnesium reduction furnace improves the deslagging efficiency.

Description

Technical Field

[0001] This invention relates to the field of magnesium smelting technology, and in particular to a renewable energy magnesium smelting system and method. Background Technology

[0002] Currently, the production of metallic magnesium in my country generally uses externally heated horizontal reduction furnaces, with fossil fuels still being used for heating, accounting for 92% of production. This results in high energy consumption, significant pollution, and high production costs in magnesium smelting. Furthermore, the horizontal furnaces have short lifespans, and due to their horizontal design, mechanized feeding and slag removal is difficult, requiring manual operation, leading to poor working conditions and high labor intensity for workers. Moreover, using dolomite as raw material, the process involves first calcining it into calcined white stone, then grinding the calcined white stone, mixing it, pressing it into balls, and then reducing it.

[0003] The two-stage calcination and reduction process results in energy waste, and the calcination stage is difficult to heat electrically, so fossil fuels are used as the heat source, causing serious environmental pollution. The horizontal tank magnesium reduction furnace is also difficult to remove slag, resulting in high labor intensity for workers. Summary of the Invention

[0004] The purpose of this invention is to provide a renewable energy magnesium smelting system and method to solve the problems existing in the prior art. It directly uses renewable energy and magnesium oxide as raw material, thus avoiding environmental pollution. The vertically arranged magnesium reduction furnace improves slag discharge efficiency.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a renewable energy magnesium smelting system, including a vertically arranged magnesium reduction furnace; a graphite cylinder is inserted inside the magnesium reduction furnace, and graphite conduits are connected to both ends of the graphite cylinder. The graphite conduits pass through a heat exchanger and are connected to a silicon thermal energy storage system. Molten liquid silicon is disposed inside the silicon thermal energy storage system. The silicon thermal energy storage system is connected to a wind power generation system, a photovoltaic power generation system, and an iron-air battery energy storage system through an intelligent integrated power coordination control system. The intelligent integrated power coordination control system is used to control the power generation of the wind power generation system and the photovoltaic power generation system, and the power generation of the iron-air battery energy storage system is directly used for the electricity load of magnesium smelting and the silicon thermal energy storage system, and to store the excess electricity in the iron-air battery energy storage system; magnesium-containing pellets are placed inside the magnesium reduction furnace, and a crystallizer is fixedly installed above the magnesium reduction furnace. The crystallizer is equipped with a water cooling device, and a vacuum pump is connected above the crystallizer. This invention uses renewable energy as a power source and magnesium oxide as a raw material to produce metallic magnesium. Through silicothermic thermal storage, the heat required for reducing metallic magnesium is obtained, and the heat is also used to generate electricity. The electricity is supplied to other stages of magnesium smelting through the charging and discharging of iron-air batteries. Furthermore, the instability of wind power and photovoltaic power is balanced. Through an intelligent integrated power coordination and control system, a stable output voltage and current are obtained to ensure the normal use of electrical loads. Magnesium oxide has a wide range of sources and can be extracted from magnesite, dolomite, brucite, serpentine, salt lakes, or seawater.

[0007] Optionally, the magnesium reduction furnace includes a furnace body and a furnace cavity. The furnace cavity contains magnesium pellets. A graphite cylinder is fixedly installed at the center of the furnace cavity, and a silicon carbide protective cylinder is fixedly fitted on the outer wall of the graphite cylinder. An upper electrically controlled ceramic valve is provided after the top inlet of the graphite cylinder passes through the upper furnace cover of the furnace body, and a lower electrically controlled ceramic valve is provided after the bottom outlet of the graphite cylinder passes through the lower furnace cover of the furnace body. The upper and lower electrically controlled ceramic valves are respectively connected to the graphite conduit. The crystallizer is installed at the upper end of the furnace body, and the lower end of the crystallizer communicates with the furnace cavity. A vacuum pump connection port is provided above the crystallizer.

[0008] Optionally, the furnace body includes a stainless steel outer shell, a heat-resistant alumina fiberboard, clay bricks, and alumina refractory bricks arranged sequentially from the outside to the inside, with the furnace cavity located inside the alumina refractory bricks; a feed inlet communicating with the furnace cavity is provided at the top of the furnace body, and the feed inlet is used to connect to a feed hopper; a slag outlet communicating with the furnace cavity is provided at the bottom of the furnace body, and a slag baffle is provided at the slag outlet; a magnesium reduction furnace support is fixedly connected to the outside of the furnace body.

[0009] Optionally, the magnesium reduction furnace's magnesium smelting electrical load is connected to the wind power generation system, photovoltaic power generation system, and iron-air battery energy storage system respectively through an intelligent integrated power supply coordination and control system.

[0010] Optionally, the system also includes a thermal power generation device connected to a heat exchanger via a circulating stainless steel pipe. The medium within the stainless steel pipe is water vapor, and the stainless steel pipe contacts the outer wall of the graphite conduit in the heat exchanger. The thermal power generation device is electrically connected to an iron-air battery energy storage system. The iron-air battery energy storage system is electrically connected to the intelligent integrated power coordination control system. As an energy storage battery, the iron-air battery energy storage system assists in the generation and storage of electricity from wind and photovoltaic power systems, ensuring a stable output voltage and current for the magnesium smelting load. The iron-air battery energy storage system supplies power to the intelligent integrated power coordination control system when its current is insufficient and stores electricity when its current is excessive. Furthermore, the iron-air battery energy storage system is connected to a thermal generator, and all electricity generated by the thermal generator is stored in the iron-air battery. The thermal generator is connected to a silicon thermal energy storage system via a heat exchanger.

[0011] Optionally, the iron-air battery energy storage system includes a 4N pure iron anode plate, a KOH-containing polymer electrolyte, and an air electrode with a catalyst. The iron-air battery energy storage system is connected to a detection module and a control module. The detection module is used to collect the output voltage of the iron-air battery energy storage system; the control module is used to control the start and stop of the iron-air battery energy storage system. The iron-air battery, combined with liquid silicon thermal energy storage, transforms renewable wind and solar energy into stable power and heat sources for magnesium smelting. Using renewable energy as a power source to heat metallic silicon, with silicon thermal energy storage serving as a heat source for magnesium smelting, eliminates the need for fossil fuels.

[0012] Optionally, the feeding hopper is connected to a briquetting machine via a conveyor belt, the briquetting machine is connected to a mixer via a conveyor belt, and the mixer is connected to a magnesium oxide silo, an aluminum powder silo, and a calcium fluoride silo via conveyor belts respectively; a metering device is installed on the conveyor belt.

[0013] Optionally, the crystallizer has a double-layered outer wall structure, with a spirally wound electromagnetic heating coil and the water cooling device disposed between the double-layered outer walls of the crystallizer. The electromagnetic heating coil is externally connected to a power source, and the water cooling device includes a copper pipe through which cooling water is circulated.

[0014] This invention also provides a method for magnesium smelting using renewable energy, comprising the following steps:

[0015] (1) Weigh magnesium oxide, calcium fluoride additive, and aluminum powder reducing agent according to the proportion and put them into a mixer for mixing. Press them into balls and put them into the magnesium oxide pellet feed hopper.

[0016] (2) Open the feeding valve of the feeding hopper to add the material into the furnace cavity. After feeding is completed, place the crystallizer in the furnace body.

[0017] (3) Connect the furnace body and crystallizer to the vacuum unit and cooling water system respectively;

[0018] (4) Start the cooling water system and start the vacuum unit to evacuate the furnace body to 5~10Pa;

[0019] (5) Start the liquid silicon heating system to allow liquid silicon to enter the graphite cylinder, and the temperature inside the furnace gradually rises to 1100℃~1250℃;

[0020] (6) The furnace body is heated to the process temperature by the control system. Magnesium rises into the crystallizer in the form of vapor. The magnesium vapor in the crystallizer crystallizes when it is cooled and condenses on the inner wall of the crystallizer.

[0021] (7) After the magnesium oxide pellet reaction is completed, close the electrically controlled ceramic valve on the furnace body, the furnace body will begin to cool down, and the crystallizer, the vacuum unit of the furnace body and the cooling water system will be shut down;

[0022] (8) Lift the crystallizer out of the furnace body, remove the crystallizer, open the crystallizer, and take out the magnesium metal;

[0023] (9) Start the slag transport vehicle to transport the slag hopper to the vicinity of the slag outlet of the furnace body, open the lower furnace cover, adjust the slag transport vehicle so that the upper opening of the slag hopper is connected with the slag outlet, open the slag baffle of the slag outlet so that the slag falls into the slag hopper. The main component of the slag is aluminum magnesium spinel.

[0024] (10) After the slag discharge is completed, close the slag baffle, remove the slag cart, and close the lower furnace cover of the furnace body;

[0025] (11) Add magnesium oxide material balls to the furnace body and repeat steps (2) to (10) in sequence.

[0026] The present invention achieves the following technical effects compared to the prior art:

[0027] This invention utilizes a smart grid composed of renewable energy and an iron-air battery energy storage system to convert renewable energy into a stable power source, replacing fossil fuels as a heat source for magnesium smelting, thus achieving clean energy. The vertically arranged furnace body replaces the horizontal tank of the Pidgeon process, extending the lifespan of the magnesium reduction furnace. Using liquid silicon as a heat source in a single magnesium reduction furnace reduces reduction time, achieves high magnesium reduction rates, and is highly efficient for large-scale industrial applications. Automated loading and unloading reduce labor intensity and promote clean production. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic cross-sectional view of the magnesium reduction furnace of the present invention;

[0030] Figure 2 This is a top view schematic diagram of the magnesium reduction furnace of the present invention;

[0031] Figure 3 This is a schematic diagram of the power supply and heating route of the renewable energy magnesium smelting system of the present invention;

[0032] Explanation of reference numerals in the attached drawings: 1-Graphite conduit, 2-Upper electrically controlled ceramic valve, 3-Vacuum pump connection port, 4-Crystallizer, 5-Stainless steel shell, 6-Alumina fiberboard, 7-Clay brick, 8-Refractory brick, 9-Furnace cavity, 10-Silicon carbide protective cylinder, 11-Graphite cylinder, 12-Liquid silicon, 13-Magnesium reduction furnace support, 14-Slag outlet, 15-Lower electrically controlled ceramic valve, 16-Feed inlet. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide a renewable energy magnesium smelting system and method to solve the problems existing in the prior art. It directly uses renewable energy and magnesium oxide as raw material, thus avoiding environmental pollution. The vertically arranged magnesium reduction furnace improves slag discharge efficiency.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] This invention provides a renewable energy magnesium smelting system, such as Figure 1As shown, the system includes a vertically arranged magnesium reduction furnace. A graphite cylinder 11 is inserted inside the furnace, with graphite conduits 1 connected to both ends. These conduits 1 pass through a heat exchanger and connect to a silicon thermal storage system. This system, acting as a heat storage device, provides a stable heat flow to the magnesium reduction furnace and a thermal generator via the heat exchanger. Molten liquid silicon 12 is contained within the silicon thermal storage system. The system comprises an integrated cylindrical container made of graphite or carbon material, containing metallic silicon as the heat storage medium. Metallic silicon has a melting point of 1414℃, a large heat storage capacity, and does not corrode the carbon container. Furthermore, the carbon container acts as a conductive conductor, generating heat and directly heating the metallic silicon to 2400℃. The molten silicon does not evaporate and is connected to the heat exchanger via graphite conduits and a ceramic heat pump. The heat exchanger is connected to the magnesium reduction furnace. The molten liquid silicon 12 enters the graphite cylinder 11 of the magnesium reduction furnace via a graphite conduit 1. The graphite cylinder 11 is connected to the graphite conduit 1 at its lower outlet, and then enters the heat exchanger. It then enters the cylindrical container in the silicon thermal storage system through the graphite conduit 1 and the ceramic heat pump. The silicon thermal storage system is connected to the wind power generation system, the photovoltaic power generation system, and the iron-air battery energy storage system through an intelligent integrated power coordination control system. The magnesium reduction furnace is used to place magnesium-containing pellets. A crystallizer 4 is fixedly installed above the magnesium reduction furnace. The crystallizer 4 is equipped with a water cooling device. A vacuum pump is connected above the crystallizer 4. The air in the furnace can be evacuated to the 5~10Pa vacuum state required for magnesium reduction through the crystallizer 4. During the magnesium smelting process, the air is continuously evacuated, but the evacuation rate must be controlled at an appropriate level to guide the magnesium vapor into the crystallizer for condensation. This invention uses renewable energy as a power source and magnesium oxide as a raw material to produce metallic magnesium. Through silicothermic thermal storage, the heat required for reducing metallic magnesium is obtained, and the heat is also used to generate electricity. The electricity is supplied to other stages of magnesium smelting through the charging and discharging of iron-air batteries. Furthermore, the instability of wind power and photovoltaic power is balanced. Through an intelligent integrated power coordination and control system, a stable output voltage and current are obtained to ensure the normal use of electrical loads. Magnesium oxide has a wide range of sources and can be extracted from magnesite, dolomite, brucite, serpentine, salt lakes, or seawater.

[0037] like Figure 1 and Figure 2As shown, the magnesium reduction furnace includes a furnace body and a furnace cavity 9. The furnace cavity 9 contains magnesium pellets. A graphite cylinder 11 is fixedly installed at the center of the furnace cavity 9, and a silicon carbide protective cylinder 10 is fixedly fitted on the outer wall of the graphite cylinder 11. The top inlet of the graphite cylinder 11 passes through the upper furnace cover of the furnace body and is equipped with an upper electrically controlled ceramic valve 2. The bottom outlet of the graphite cylinder 11 passes through the lower furnace cover of the furnace body and is equipped with a lower electrically controlled ceramic valve 15. The upper electrically controlled ceramic valve 2 and the lower electrically controlled ceramic valve 15 are respectively connected to the graphite conduit 1. A crystallizer 4 is installed at the upper end of the furnace body. The lower end of the crystallizer 4 is connected to the furnace cavity 9. A vacuum pump connection port 3 is provided above the crystallizer 4. Multiple holes are opened in the upper furnace cover of the furnace body. Two holes are equipped with clamps for installing the crystallizer 4, and the others are feed inlets 16. A vacuum detector is installed in the furnace body and is connected to a control system. The furnace body comprises, from the outside in, a stainless steel outer shell 5, a heat-resistant alumina fiberboard 6, clay bricks 7, and alumina refractory bricks 8, with the furnace cavity 9 located inside the alumina refractory bricks 8. A feed inlet 16, communicating with the furnace cavity 9, is located at the top of the furnace body and is used to connect to the feed hopper. A slag outlet 14, communicating with the furnace cavity 9, is located at the bottom of the furnace body, and a slag baffle is installed at the slag outlet 14. A magnesium reduction furnace support 13 is fixedly connected to the outside of the furnace body. A temperature measuring device is installed on the heat-resistant alumina fiberboard inside the magnesium reduction furnace, and the temperature measuring device is connected to the control system. The control system can send control signals to the vacuum device, the upper electrically controlled ceramic valve, and the lower electrically controlled ceramic valve, respectively. The magnesium smelting electrical load of the magnesium reduction furnace is connected to the wind power generation system, the photovoltaic power generation system, and the iron-air pool energy storage system through an intelligent integrated power coordination control system.

[0038] The feed hopper is connected to a briquetting machine via a conveyor belt. The briquetting machine is connected to a mixer via a conveyor belt. The mixer is connected to the magnesium oxide silo, aluminum powder silo, and calcium fluoride silo via conveyor belts. A metering device is installed on the conveyor belt. When all materials enter the mixer together, they are mixed. After mixing, 95% of the material particles are between 180 and 200 mesh, and the rest are smaller than 180 mesh. The magnesium oxide pellets are elliptical spheres, 3 cm long and 2 cm wide. The magnesium oxide pellets are fed into the pellet feed hopper at the top of the magnesium reduction furnace via a conveyor belt for use. After a furnace has undergone 4-5 hours of reduction, the vacuum is removed. First, the crystallizer 4 containing crystalline magnesium is replaced with a new crystallizer 4. The slag outlet 14 of the magnesium reduction furnace is opened, and the reduction slag is transported away in a slag car under gravity. The crystallizer has a double-layered outer wall structure. Between the double-layered outer walls of the crystallizer 4, there is a spirally wound electromagnetic heating coil and a water cooling device. The electromagnetic heating coil is connected to a power source. The water cooling device includes copper pipes, through which cooling water is introduced to ensure that the crystallization temperature of metallic magnesium is always within the range of 520~580℃. A graphite filter is provided at the front end of the crystallizer 4, and magnesium vapor in the magnesium reduction furnace can enter the crystallizer 4 through the graphite filter in sequence.

[0039] A further preferred embodiment includes a thermal power generation device connected to a heat exchanger via a circulating stainless steel pipe. The medium inside the stainless steel pipe is water vapor, and the stainless steel pipe contacts the outer wall of a graphite conduit within the heat exchanger. The thermal power generation device is electrically connected to an iron-air battery energy storage system, which is electrically connected to an intelligent integrated power coordination control system. Liquid metallic silicon passing through the graphite conduit in the heat exchanger continues into the magnesium reduction furnace, ensuring heat supply for the furnace. Additionally, the stainless steel pipe, in contact with the outside of the graphite conduit, transfers some heat to the water medium within it, converting it into water vapor. This water vapor enters the thermal generator, driving it to generate electricity. The cooled water vapor returning to the generator cycles through the heat exchanger. The liquid metallic silicon in the graphite conduit of the heat exchanger passes through the magnesium reduction furnace, returns to the heat exchanger, and then returns to the silicon-storage graphite cylinder of the silicon thermal energy storage system for further electric heating and heat storage, in a continuous cycle. The power and heat supply routes of this invention are as follows: Figure 3 As shown; Figure 3In this system, the wind power generation system is connected to the intelligent integrated power coordination control system via an AC / DC converter, the photovoltaic power generation system is connected to the intelligent integrated power coordination control system via a DC / DC converter, and the iron-air battery energy storage system is connected to the intelligent integrated power coordination control system via a DC / DC converter. The intelligent integrated power coordination control system connects the electricity generated by the wind power generation system to the magnesium smelting load via a DC / AC converter, and connects the electricity generated by the photovoltaic power generation system to the silicon thermal energy storage system via a DC / DC converter, thus making the renewable energy power more stable. The iron-air battery energy storage system is used to supply power to the intelligent integrated power coordination control system when its current is insufficient and to store electricity when its current is excessive. Furthermore, the iron-air battery energy storage system is connected to the thermal power generation device via an AC / DC converter, and all the electricity generated by the thermal power generation device is stored in the iron-air battery energy storage system. The thermal power generation device is connected to the silicon thermal energy storage system via a heat exchanger. The iron-air battery energy storage system also includes a pure 4N iron anode plate, a KOH polymer electrolyte, and an air electrode with a catalyst. Preparation of KOH-containing polymer electrolyte: A certain amount of PVA was dissolved in an appropriate amount of deionized water and heated to 90°C while being magnetically stirred for 2 hours. The PVA was completely dissolved in the deionized water to form a homogeneous viscous solution. The solution was cooled to 70°C and appropriate amounts of PEO and (NH4)2S2O3 were added. When the mass ratio of PVA to PEO was 10:1, a three-dimensional porous structure appeared on the surface of the polymer electrolyte membrane. This structure not only improves the storage capacity of the electrolyte but also facilitates the migration of ions inside the polymer. The solution was stirred until homogeneous, then allowed to stand, cast, and dried to form a film. The film was then immersed in 7% KOH solution for 24 hours for activation, and finally, the KOH-containing polymer PVA / PEO electrolyte was obtained. Air cathode preparation: 10% conductive carbon black, 8% PVDF-HFP, and 82% MnO2-Ag were mixed in proportion to prepare an air cathode. Dissolve an appropriate amount of PVDF-HFP in N-methylpyrrolidone (NMP) and stir at 60°C to form an 8% binder. Grind and stir conductive carbon black and MnO2-Ag powder for 20 minutes to ensure thorough mixing, then add to the binder. Sonicate for 30 minutes, then evenly coat the paste-like active material onto carbon cloth, compact, and dry at 100°C to a thickness of approximately 0.5 mm. Assemble the iron anode, KOH-containing polymer electrolyte, and air electrode in sequence, compact, and place inside the iron-air battery casing, extending the conductive wire. The iron-air battery energy storage system is connected to a detection module and a control module. The detection module collects the output voltage of the iron-air battery energy storage system; the control module controls the start and stop of the iron-air battery energy storage system. When the output voltage of the iron-air battery energy storage system is lower than the set voltage value, the control module controls the iron-air battery energy storage system to start supplying power to the intelligent integrated coordination control system until the output voltage reaches the set voltage value.By using an iron-air battery energy storage system as a power source to balance wind and solar power, a comprehensive energy supply system is formed, ensuring a stable output voltage and current for the electrical loads used in magnesium smelting. Renewable energy is electrically heated by a smart integrated coordination and control system to store thermal energy in metallic silicon, which is then supplied to the heat loads via a heat exchanger. Molten liquid silicon has a large thermal storage capacity and does not corrode carbonaceous material containers. The iron-air battery energy storage system and the silicon thermal storage system together form a low-cost, long-lasting power and heat supply system, making unstable renewable energy a reliable power and heat source for magnesium smelting.

[0040] This invention also provides a method for refining magnesium using renewable energy, which directly uses renewable energy and magnesium oxide as raw material to produce metallic magnesium, comprising the following steps:

[0041] (1) Weigh 180 mesh magnesium oxide, 200 mesh calcium fluoride additive, and 180~200 mesh aluminum powder reducing agent into a mixer and mix them. Press them into balls and put them into the magnesium oxide pellet feed hopper.

[0042] (2) Open the feeding valve of the feeding hopper to add the material into the furnace chamber 9. After feeding is completed, place the crystallizer 4 into the furnace body.

[0043] (3) Connect the furnace body and crystallizer 4 to the vacuum unit and cooling water system respectively;

[0044] (4) Start the cooling water system and start the vacuum unit to evacuate the furnace body to 5~10Pa;

[0045] (5) Start the liquid silicon heating system to allow liquid silicon 12 to enter the graphite cylinder 11, and the temperature inside the furnace gradually rises to 1100℃~1250℃;

[0046] (6) The furnace body is heated to the process temperature by the control system. Magnesium rises into the crystallizer 4 in the form of vapor. The magnesium vapor in the crystallizer 4 is cooled and crystallized, and condenses on the inner wall of the crystallizer 4.

[0047] (7) After the magnesium oxide pellet reaction is completed, close the electrically controlled ceramic valve on the furnace body, the furnace body will begin to cool down, and shut down the crystallizer 4, the vacuum unit of the furnace body and the cooling water system;

[0048] (8) Lift the crystallizer 4 out of the furnace body, remove the crystallizer 4, open the crystallizer 4, and take out the magnesium metal;

[0049] (9) Start the slag transport vehicle to transport the slag hopper to the vicinity of the slag outlet 14 of the furnace body, open the lower furnace cover, adjust the slag transport vehicle so that the upper opening of the slag hopper is connected with the slag outlet 14, open the slag baffle of the slag outlet 14, and let the slag fall into the slag hopper. The main component of the slag is aluminum magnesium spinel.

[0050] (10) After the slag discharge is completed, close the slag baffle, remove the slag cart, and close the lower furnace cover of the furnace body;

[0051] (11) Add magnesium oxide material balls to the furnace body and repeat steps (2) to (10) in sequence.

[0052] In the description of this invention, it should be noted that the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A renewable energy magnesium smelting system characterized by: The application relates to a magnesium reduction furnace, which comprises a magnesium reduction furnace arranged vertically; a graphite cylinder is arranged in the magnesium reduction furnace; graphite pipes are connected to the two ends of the graphite cylinder respectively; the graphite pipes are communicated with a silicon heat storage system through heat exchangers; the silicon heat storage system is arranged with molten liquid silicon; the silicon heat storage system is connected with a wind power generation system, a photovoltaic power generation system and an iron-air battery storage system through an intelligent comprehensive power coordination control system; the magnesium reduction furnace is arranged with magnesium-containing pellets; a crystallizer is arranged above the magnesium reduction furnace; a water cooling device is arranged on the crystallizer; a vacuum pump is communicated with the top of the crystallizer; the magnesium reduction furnace comprises a furnace body and a furnace cavity; the furnace cavity is arranged with magnesium-containing pellets; the graphite cylinder is fixedly arranged in the center of the furnace cavity; a silicon carbide protection cylinder is fixedly arranged on the outer wall of the graphite cylinder; an upper electric control ceramic valve is arranged on the top inlet of the graphite cylinder; a lower electric control ceramic valve is arranged on the bottom outlet of the graphite cylinder; the upper electric control ceramic valve and the lower electric control ceramic valve are connected with the graphite pipes respectively; the crystallizer is arranged on the upper end of the furnace body; the lower end of the crystallizer is communicated with the furnace cavity; a vacuum pump connecting port is arranged above the crystallizer; the magnesium reduction furnace is connected with the wind power generation system, the photovoltaic power generation system and the iron-air battery storage system through the intelligent comprehensive power coordination control system.

2. The renewable energy magnesium production system of claim 1, wherein: The furnace body comprises a stainless steel shell, a heat-resistant alumina fiber plate, clay bricks and alumina refractory bricks arranged from outside to inside in sequence; the furnace cavity is located on the inner side of the alumina refractory bricks; a feeding port communicated with the furnace cavity is arranged on the top of the furnace body; the feeding port is arranged with a feeding bin; a slag outlet communicated with the furnace cavity is arranged on the bottom of the furnace body; a magnesium reduction furnace support is fixedly connected to the outside of the furnace body.

3. The renewable energy magnesium production system of claim 1, wherein: The application further comprises a heat power generation device connected with the heat exchanger through a circularly arranged stainless steel pipe; the medium in the stainless steel pipe is water vapor; the stainless steel pipe is in contact with the outer wall of the graphite pipe in the heat exchanger; the heat power generation device is electrically connected with the iron-air battery storage system; the iron-air battery storage system is electrically connected with the intelligent comprehensive power coordination control system.

4. The renewable energy magnesium production system of claim 3, wherein: The iron-air battery storage system comprises a 4N-purity iron anode plate, a KOH-containing polymer electrolyte and an air electrode with a catalyst; the iron-air battery storage system is connected with a detection module and a control module; the detection module is used for collecting the output voltage of the iron-air battery storage system; the control module is used for controlling the start and stop of the iron-air battery storage system.

5. The renewable energy magnesium production system of claim 2, wherein: The feeding bin is communicated with a ball pressing machine through a conveying belt; the ball pressing machine is communicated with a mixer through a conveying belt; the mixer is communicated with a magnesium oxide bin, an aluminum powder bin and a calcium fluoride bin through conveying belts respectively; a metering device is arranged on the conveying belt.

6. The renewable energy magnesium production system of claim 1, wherein: The crystallizer is a double-layer outer wall structure; an electromagnetic heating coil and a water cooling device are arranged between the double-layer outer walls of the crystallizer; the electromagnetic heating coil is connected with a power source; the water cooling device comprises a copper pipe; cooling water is introduced into the copper pipe.

7. A method of renewable energy-based magnesium smelting based on the system of any one of claims 1 to 6, characterized by: The application further comprises the following steps: (1) Magnesium oxide, additive calcium fluoride, reducing agent aluminum powder are weighed into the mixer according to the proportion, stirred and mixed, pressed into balls, and put into the magnesium oxide pellet feed bin; (2) Open the feed bin discharge valve, add the material to the furnace cavity, and after the feeding is completed, place the crystallizer in the furnace body; (3) Connect the furnace body and the crystallizer with the vacuum unit and the cooling water system respectively; (4) Start the cooling water system and start the vacuum unit to vacuum the furnace body to 5~10Pa; (5) Start the liquid silicon heating system, make the liquid silicon enter the graphite cylinder, and gradually heat the furnace temperature to 1100℃~1250℃; (6) Control the furnace body to heat to the process temperature through the control system, and the magnesium rises in the form of vapor into the crystallizer, the magnesium vapor in the crystallizer crystallizes when it is cold, and condenses on the inner wall of the crystallizer; (7) After the magnesium oxide pellet reaction is completed, close the electric control ceramic valve on the furnace body, start cooling the furnace body, and close the vacuum unit and cooling water system of the crystallizer and the furnace body; (8) Hoist the crystallizer out of the furnace body, remove the crystallizer, open the crystallizer, and take out the magnesium; (9) Start the slag car to transport the slag tank to the vicinity of the slag outlet of the furnace body, open the lower furnace cover, adjust the slag car to make the upper opening of the slag tank and the slag outlet butt joint, open the slag baffle of the slag outlet, and make the slag fall into the slag tank. The main component of the slag is aluminum magnesium spinel; (10) After the slag is discharged, close the slag baffle, remove the slag car, and close the lower furnace cover of the furnace body; (11) Add magnesium oxide material balls to the furnace body, and cycle steps (2)~(10) in turn.

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