Magnesium vapor purification device and method for solid-liquid reactive magnesium metallurgy

Abstract

This invention discloses a magnesium steam purification device for solid-liquid reactive magnesium metallurgy, comprising a sealed furnace cover and a furnace body. The furnace cover has a molten metal inlet, and the side wall of the furnace body has a magnesium steam inlet, a magnesium steam outlet, and a molten metal outlet. The molten metal outlet is connected to the inlet of a molten metal circulation system via a pipeline, and the outlet of the molten metal circulation system is connected to the molten metal inlet via a pipeline. The furnace body is divided into a bottom guiding zone, a middle impurity removal zone, and a top filter material zone from bottom to top. A ceramic grate is installed between the bottom guiding zone and the middle impurity removal zone, and a distribution plate is installed between the middle impurity removal zone and the top filter material zone. This invention uses a ceramic ball filling layer to thin the reducing molten metal into a molten metal layer, while simultaneously performing a secondary reduction of the magnesium oxide powder contained in the magnesium steam, significantly improving the purity of the final crystalline magnesium. The molten metal can also be recycled, supporting continuous production and effectively reducing the production cost of magnesium steam purification.

Description

Technical Field

[0001] This invention belongs to the field of magnesium purification technology, and relates to a magnesium steam purification device for solid-liquid reaction magnesium metallurgy. This invention also relates to a magnesium steam purification method for solid-liquid reaction magnesium metallurgy. Background Technology

[0002] Magnesium and magnesium alloys, as the lightest structural materials currently available, have irreplaceable application value in lightweight transportation, thinner and lighter 3C electronics, and metal corrosion protection, and have become a key metallic material supporting industrial development after steel. In terms of production technology, over 90% of my country's primary magnesium production capacity relies on the Pidgeon process, which has long held a dominant position due to its small investment scale and simple operation. However, the traditional Pidgeon process (including horizontal and vertical tank reduction processes) faces insurmountable core technological bottlenecks, specifically high energy consumption and high carbon emissions, low reaction efficiency, limited reduction rate, and a single heat transfer mechanism. The Pidgeon process primarily uses solid coal as its external heating source, requiring 8-12 tons of high-quality coal per ton of primary magnesium. CO2 emissions far exceed current environmental standards, making it unsuitable for green industrial development. The horizontal tank reduction cycle is as long as 8-12 hours, and even the improved vertical tank process still requires over 5 hours. Furthermore, it is mostly an intermittent production mode with low single-tank output, making large-scale continuous operation difficult. The reaction relies on a pelletized mass of calcined dolomite and ferrosilicon, both of which are poor thermal conductors. The internal and intergranular contact within the pellets is mainly point-to-point, resulting in extremely low heat and mass transfer efficiency, causing the magnesium oxide reduction rate to remain at only 80-85%. In a vacuum reaction environment, convective heat transfer is lost, and radiative and conductive heat transfer are gradually attenuated by the pelletized mass, further limiting the rate of reaction improvement.

[0003] To overcome the aforementioned technical difficulties, this invention combines three patents: CN118773434A (publication date: October 15, 2024) entitled "An efficient and low-carbon magnesium smelting reduction device and method"; CN119592813A (publication date: March 11, 2025) entitled "An efficient and low-carbon vertical tank supergravity mixing magnesium smelting device and method"; and 202411749850.1 entitled "A negative pressure atomization and supergravity enhanced liquid-solid reaction magnesium metallurgical device and method". By constructing a liquid-solid interface with a liquid reducing agent (ferrosilicon, calcium silicon, metal-based alloys, etc.) and solid magnesium oxide powder, the liquid-solid interface is replaced by the solid-solid interface of the traditional Pidgeon process, achieving efficient liquid-solid mixing and fundamentally enhancing heat and mass transfer efficiency.

[0004] However, the above methods have new technical defects in industrial practice. In the liquid-solid mixing reaction stage, the high-speed rotating spraying of the "High-efficiency Low-carbon Magnesium Smelting Reduction Device and Method" is prone to carrying up fine magnesium oxide powder due to centrifugal force. The high-gravity environment of the "High-efficiency Low-carbon Vertical Tank Ultragravity Mixing Magnesium Smelting Device and Method" will cause unreacted powder to escape with the airflow disturbance. The negative pressure atomization crushing of the "Negative Pressure Atomization and Ultragravity Enhanced Liquid-Solid Reaction Magnesium Metallurgical Device and Method" may carry in fine slag particles. Therefore, some unreacted magnesium oxide micro powder, SiO2 / Al2O3 slag fine particles generated by the reaction and other solid impurities will escape with magnesium vapor. Due to the extremely small particle size of solid impurities, the magnesium vapor sieve filtration system in existing patents is unable to achieve complete separation, leading to a condensation and crystallization stage. Solid powder is mixed into the original crystalline magnesium, directly reducing the purity of the original magnesium and increasing the complexity and energy consumption cost of the crude magnesium refining process. At the same time, impurities adhere to the inner wall of the condenser tube, weakening the heat transfer efficiency of the condenser tube, shortening the service life of the equipment, and hindering the industrial promotion of solid-liquid reaction technology and the upgrading of product quality. Summary of the Invention

[0005] The first objective of this invention is to provide a magnesium vapor purification device for solid-liquid reaction magnesium metallurgy, which solves the problem of solid powder inclusions in magnesium vapor in the prior art, and at the same time absorbs impurity gases to further improve the purity of crystalline magnesium.

[0006] The second objective of this invention is to provide a method for purifying magnesium steam in solid-liquid reactive magnesium metallurgy.

[0007] The first technical solution adopted in this invention is a magnesium steam purification device for solid-liquid reaction magnesium metallurgy, comprising a sealed furnace cover and a furnace body. The furnace cover has a molten metal inlet, and the side wall of the furnace body has a magnesium steam inlet, a magnesium steam outlet, and a molten metal outlet. The molten metal outlet is connected to the inlet of a molten metal circulation system through a pipeline, and the outlet of the molten metal circulation system is connected to the molten metal inlet through a pipeline. The furnace body is divided into a bottom guiding zone, a middle impurity removal zone, and a top filter material zone from bottom to top. A ceramic grate is provided between the bottom guiding zone and the middle impurity removal zone, and a distribution plate is provided between the middle impurity removal zone and the top filter material zone.

[0008] The invention is further characterized by: The magnesium vapor inlet and the molten metal outlet are located on the furnace wall in the bottom guide zone, with the magnesium vapor inlet higher than the molten metal outlet. An inclined guide plate is provided between the magnesium vapor inlet and the molten metal outlet.

[0009] The central impurity removal zone contains a ceramic ball filling layer, which consists of several ceramic balls of the same diameter.

[0010] The ceramic grate has several square grate holes evenly distributed on it, and the size of the grate holes is smaller than the diameter of the ceramic ball.

[0011] The top filter media area contains molten metal, and several round holes are evenly distributed on the distribution plate.

[0012] The melting point of the molten metal is no greater than 1200℃, it is not soluble in magnesium, and the evaporation pressure at the working temperature is lower than that of magnesium.

[0013] Valves are installed at the molten metal inlet, magnesium vapor inlet, magnesium vapor outlet, and molten metal outlet.

[0014] The molten metal circulation system includes a molten metal storage tank and an electromagnetic pump connected by pipelines. The molten metal storage tank is equipped with a loading port and a heating system. The outlet of the molten metal storage tank is connected to the inlet of the electromagnetic pump, and a valve is provided on the pipeline connecting the molten metal storage tank and the electromagnetic pump.

[0015] The furnace wall consists of an outer shell, an insulation layer, and an inner lining layer from the outside to the inside. Heating wires are installed inside the insulation layer.

[0016] The second technical solution adopted in this invention is a method for purifying magnesium vapor in solid-liquid reaction magnesium metallurgy, which uses the above-mentioned magnesium vapor purification device for solid-liquid reaction magnesium metallurgy to purify magnesium vapor, specifically including the following steps: Step 1: Melt the metal block into molten metal through a molten metal circulation system; Step 2: Create a vacuum environment inside the furnace, heat and maintain the furnace to the required process temperature; Step 3: The molten metal is transported to the top filter media area, and magnesium vapor is introduced for purification at the same time; Step 4: Circulate the molten metal to purify the magnesium vapor until purification is complete.

[0017] The beneficial effects of this invention are: This invention uses a ceramic ball filling layer to thin the reducing molten metal into a molten metal layer, which filters magnesium vapor and simultaneously performs secondary reduction on the magnesium oxide powder contained in the magnesium vapor, thereby improving the solid-liquid reaction reduction rate. This effectively solves the problem of solid powder inclusions in solid-liquid reaction magnesium metallurgy technology and significantly improves the purity of the final crystalline magnesium. Furthermore, no other foreign impurities are introduced during the purification process, the molten metal can be recycled, supporting continuous production and effectively reducing the production cost of magnesium vapor purification. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the magnesium steam purification device for solid-liquid reaction magnesium metallurgy according to the present invention. Figure 2 This is a top view of the ceramic grate in this invention; Figure 3 This is a top view of the distribution plate in this invention; Figure 4 This is a partial enlarged view of the furnace wall in the furnace body of this invention.

[0019] In the diagram, 1. Furnace cover, 2. Furnace body, 3. Molten metal circulation system, 101. Molten metal inlet, 201. Magnesium vapor inlet, 202. Magnesium vapor outlet, 203. Molten metal outlet, 204. Ceramic grate, 205. Distribution plate, 206. Guide plate, 207. Ceramic ball filling layer, 208. Molten metal, 209. Bottom thermocouple, 210. Top thermocouple, 301. Molten metal storage tank, 302. Electromagnetic pump, 303. Charging port. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides a magnesium steam purification device for solid-liquid reactive magnesium metallurgy, such as... Figure 1 As shown, the furnace includes a sealed furnace cover 1 and a furnace body 2. The furnace cover 1 has a molten metal inlet 101. The side wall of the furnace body 2 has a magnesium vapor inlet 201, a magnesium vapor outlet 202, and a molten metal outlet 203. The molten metal outlet 203 is connected to the inlet of the molten metal circulation system 3 through a pipeline. The outlet of the molten metal circulation system 3 is connected to the molten metal inlet 101 through a pipeline. Valves are provided on the molten metal inlet 101, magnesium vapor inlet 201, magnesium vapor outlet 202 and molten metal outlet 203.

[0022] The furnace body 2 is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter media zone from bottom to top; a ceramic grate 204 is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate 205 is provided between the middle impurity removal zone and the top filter media zone.

[0023] The magnesium vapor inlet 201 and the molten metal outlet 203 are located on the furnace wall of the bottom guide zone, and the magnesium vapor inlet 201 is higher than the molten metal outlet 203. An inclined guide plate 206 is provided between the magnesium vapor inlet 201 and the molten metal outlet 203.

[0024] The central impurity removal zone contains a ceramic ball filling layer 207, which is composed of several ceramic balls of the same diameter, such as... Figure 2 As shown, several square grate holes are evenly distributed on the ceramic grate 204, and the size of the grate holes is smaller than the diameter of the ceramic ball.

[0025] The top filter media area contains molten metal 208. Molten metal 208 has a melting point no greater than 1200℃, is not soluble in magnesium, and has a lower evaporation pressure at operating temperature than magnesium, such as aluminum or lead. Figure 3 As shown, several circular holes are evenly distributed on the distribution plate 205.

[0026] A bottom thermocouple 209 is provided above the magnesium vapor inlet 201, and a top thermocouple 210 is provided above the molten metal 208. The bottom thermocouple 209 and the top thermocouple 210 are used to collect the actual temperature of the bottom guide zone and the top filter material zone in real time, so as to facilitate the control of the purification temperature inside the furnace body 2.

[0027] like Figure 4 As shown, the furnace wall of furnace body 2 consists of an outer shell, an insulation layer, and an inner lining layer from the outside to the inside, with heating wires installed inside the insulation layer.

[0028] The molten metal circulation system 3 includes a molten metal storage tank 301 and an electromagnetic pump 302 connected by pipelines. The outlet of the molten metal storage tank 301 is connected to the inlet of the electromagnetic pump 302; the inlet of the molten metal storage tank 301 is connected to the molten metal outlet 203 via a pipeline, and the outlet of the electromagnetic pump 302 is connected to the molten metal inlet 101 via a pipeline; the guide plate 206 is inclined at a certain angle to facilitate the collection of molten metal 208 to the molten metal outlet 203. The molten metal 208 absorbs solid dust and secondary reduction of magnesium oxide powder, and the products are all solid slag. With the power of the electromagnetic pump 302, the molten metal 208 that has completed one purification and adsorption recovery is transported from the molten metal storage tank 301 to the circulation path, realizing the repeated recycling of molten metal 208 and avoiding waste of molten metal.

[0029] A loading port 303 is provided above the molten metal storage tank 301. The loading port 303 is used for loading or removing slag. The molten metal storage tank includes a heating system. A valve is installed on the pipeline between the molten metal storage tank 301 and the electromagnetic pump 302.

[0030] The working principle of the magnesium steam purification device for solid-liquid reactive magnesium metallurgy of this invention is as follows: Metal material is added to the molten metal circulation system 3 and heated to molten metal 208. Molten metal 208 is added from the furnace cover 1 to the top filter material area. At this time, due to its own gravity and surface tension, molten metal 208 naturally thins as it flows through the ceramic ball filling layer 207 to form a molten metal layer. Magnesium vapor enters the furnace body 2 from the magnesium vapor inlet 201, is fully purified by adsorption in molten metal 208, and is output from the magnesium vapor outlet 202. Molten metal 208 flows into the bottom guide area and then gathers at the molten metal outlet 203. It is collected and reused through the molten metal circulation system 3. In the magnesium vapor purification process, the metal liquid layer ensures the smooth passage of magnesium vapor through a thinned structure, while also fully retaining its adsorption characteristics for solid powder impurities and impurity gases, providing a key impurity removal basis for magnesium vapor purification. Through the synergistic effect of ceramic ball filling layer 207 (optimizing metal liquid morphology), metal liquid 208 (adsorption characteristics), and electromagnetic pump 302 (driving circulation), a magnesium vapor purification technology and device for solid-liquid reaction magnesium metallurgy is finally realized, which is easy to operate, can be continuously produced, and has low cost.

[0031] A method for purifying magnesium vapor in solid-liquid reactive magnesium metallurgy involves using the aforementioned magnesium vapor purification device for solid-liquid reactive magnesium metallurgy, specifically implemented according to the following steps: Step 1: Melt the metal block into molten metal 208 through a molten metal circulation system; All valves in the device are closed. The metal block is added to the molten metal storage tank 208 through the loading port 303 and heated by the heating system until the metal block is completely melted.

[0032] Step 2: Create a vacuum environment inside furnace 2, heat and maintain the furnace 2 at the required process temperature; A vacuum environment is created by evacuating the magnesium vapor outlet 202, and the heating wires inside the furnace wall of the furnace body 2 are activated to raise the temperature inside the furnace body 2 and complete the preheating.

[0033] Step 3: The molten metal 208 is conveyed to the top filter media area, and magnesium vapor is introduced for purification at the same time; Specifically: Start the electromagnetic pump 302 to transport the liquid metal 208 in the liquid metal storage tank 301 from the liquid metal inlet 101 to the top filter material area. The liquid metal 208 falls evenly into the ceramic ball filling layer 207 through the holes of the distribution plate 205. Under the combined action of its own gravity and surface tension, a continuous liquid metal film is formed on the surface and gaps of the ceramic ball filling layer 207. Meanwhile, magnesium vapor enters the furnace body 2 from the bottom guide zone through magnesium vapor inlet 201. As it travels upward through the ceramic ball filling layer 207, it fully interacts with the liquid metal film. Solid powder impurities and impurity gases in the magnesium vapor are precisely captured by the liquid metal film. Among them, magnesium oxide powder in the solid powder can be reduced by the reducing liquid metal to generate magnesium vapor, further improving the reduction rate of magnesium. The purified magnesium vapor flows out through magnesium vapor outlet 202 and condenses and crystallizes in the condensation area set outside the furnace body 2. Under the guidance of the guide plate 206, the molten metal carrying impurities is collected at the molten metal outlet 203 and finally flows into the circulating molten metal storage tank 301.

[0034] Step 4: Circulate molten metal 208 to purify magnesium vapor until purification is complete; After the molten metal completes one cycle, the scum in the molten metal is removed by scooping out through the loading port 303; then, the treated molten metal is transported again to the top filter material area through the molten metal inlet 101 by the electromagnetic pump 302, starting a new round of magnesium vapor purification cycle.

[0035] In existing purification technologies, a liquid seal effect may occur. This effect refers to the static pressure generated by a stationary liquid at a certain height, which can form a liquid barrier inside the equipment. For gas to pass through this barrier, it must possess sufficient driving force. The higher the liquid layer, the greater the static pressure, and the more difficult it is for the gas to break through the barrier, with its movement being significantly inhibited. In actual operation, this manifests as a continuous increase in furnace pressure until the gas pressure exceeds the liquid static pressure, at which point the water seal can be broken. However, at this point, the gas pressure is high, the rising gas mass is large, and the contact between the liquid and gas is insufficient, making it difficult to effectively remove impurities from the gas, resulting in a decrease in the impurity removal effect. Therefore, it is necessary to appropriately reduce the thickness of the liquid layer and lower the static pressure to ensure smooth gas passage while achieving efficient impurity removal. Using the solid-liquid reaction magnesium metallurgy magnesium vapor purification device and method of this invention, the liquid seal effect can be eliminated while solving the powder inclusion problem, ensuring that magnesium vapor migration is not inhibited. This solves the problem that an increased magnesium vapor partial pressure leads to a large rising gas mass, resulting in the inability to effectively adsorb dust and impurity gases and a significant weakening of the impurity removal effect.

[0036] ICP-MS (Inductively Coupled Plasma Mass Spectrometry) tests were performed on the crystalline magnesium obtained by the magnesium steam purification device and method for solid-liquid reaction magnesium metallurgy of the present invention, and the purity of the crystalline magnesium can reach 4N level.

[0037] Example 1 The magnesium steam purification device for solid-liquid reaction magnesium metallurgy in this embodiment includes a sealed furnace cover 1 and a furnace body 2. The furnace cover 1 has a molten metal inlet 101, and the side wall of the furnace body 2 has a magnesium steam inlet 201, a magnesium steam outlet 202, and a molten metal outlet 203. The molten metal outlet 203 is connected to the inlet of the molten metal circulation system 3 through a pipeline, and the outlet of the molten metal circulation system 3 is connected to the molten metal inlet 101 through a pipeline. The furnace body 2 is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter media zone from bottom to top; a ceramic grate 204 is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate 205 is provided between the middle impurity removal zone and the top filter media zone.

[0038] The magnesium vapor inlet 201 and the molten metal outlet 203 are located on the furnace wall of the bottom guide zone, and the magnesium vapor inlet 201 is higher than the molten metal outlet 203. An inclined guide plate 206 is provided between the magnesium vapor inlet 201 and the molten metal outlet 203.

[0039] The central impurity removal zone contains a ceramic ball filling layer 207, which is composed of several ceramic balls of the same diameter. A number of square grate holes are evenly distributed on the ceramic grate 204, the size of which is smaller than the diameter of the ceramic balls.

[0040] The top filter media area contains molten metal 208, and several round holes are evenly distributed on the distribution plate 205.

[0041] Valves are provided on the molten metal inlet 101, magnesium vapor inlet 201, magnesium vapor outlet 202 and molten metal outlet 203.

[0042] The molten metal circulation system 3 includes a molten metal storage tank 301 and an electromagnetic pump 302 connected by pipelines. The molten metal storage tank 301 is equipped with a loading port 303 and includes a heating system. The outlet of the molten metal storage tank 301 is connected to the inlet of the electromagnetic pump 302, and a valve is provided on the pipeline connecting the molten metal storage tank 301 and the electromagnetic pump 302. The inlet of the molten metal storage tank 301 is connected to the molten metal outlet 203 via a pipeline, and the outlet of the electromagnetic pump 302 is connected to the molten metal inlet 101 via a pipeline.

[0043] Example 2 In this embodiment, the magnesium vapor purification device for solid-liquid reactive magnesium metallurgy of Example 1 is used to purify magnesium vapor, and the molten metal 208 is molten aluminum. The specific implementation steps are as follows: Step 1: Melt the aluminum block into molten aluminum using a molten metal circulation system; Melting temperature: Step 2: Construct a vacuum environment inside furnace body 2, heat and maintain the furnace body 2 to the required process temperature; operating temperature 1000℃, pressure 0.1Pa~5Pa; Step 3: The molten aluminum is transported to the top filter material area, and magnesium vapor is introduced for purification at the same time; Step 4: Circulate the molten aluminum to purify the magnesium vapor until purification is complete.

[0044] Using the method in this embodiment, the purity of the crystalline magnesium obtained after magnesium vapor condensation and crystallization is 99.9958%, and the specific test data is shown in Table 1 below.

[0045] Table 1

[0046] Example 3 The magnesium steam purification device for solid-liquid reaction magnesium metallurgy in this embodiment includes a sealed furnace cover 1 and a furnace body 2. The furnace cover 1 has a molten metal inlet 101, and the side wall of the furnace body 2 has a magnesium steam inlet 201, a magnesium steam outlet 202, and a molten metal outlet 203. The molten metal outlet 203 is connected to the inlet of the molten metal circulation system 3 through a pipeline, and the outlet of the molten metal circulation system 3 is connected to the molten metal inlet 101 through a pipeline. The furnace body 2 is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter media zone from bottom to top; a ceramic grate 204 is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate 205 is provided between the middle impurity removal zone and the top filter media zone.

[0047] Example 4 The magnesium steam purification device for solid-liquid reaction magnesium metallurgy in this embodiment includes a sealed furnace cover 1 and a furnace body 2. The furnace cover 1 has a molten metal inlet 101, and the side wall of the furnace body 2 has a magnesium steam inlet 201, a magnesium steam outlet 202, and a molten metal outlet 203. The molten metal outlet 203 is connected to the inlet of the molten metal circulation system 3 through a pipeline, and the outlet of the molten metal circulation system 3 is connected to the molten metal inlet 101 through a pipeline. The furnace body 2 is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter media zone from bottom to top; a ceramic grate 204 is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate 205 is provided between the middle impurity removal zone and the top filter media zone.

[0048] The magnesium vapor inlet 201 and the molten metal outlet 203 are located on the furnace wall of the bottom guide zone, and the magnesium vapor inlet 201 is higher than the molten metal outlet 203. An inclined guide plate 206 is provided between the magnesium vapor inlet 201 and the molten metal outlet 203.

[0049] Example 5 The magnesium steam purification device for solid-liquid reaction magnesium metallurgy in this embodiment includes a sealed furnace cover 1 and a furnace body 2. The furnace cover 1 has a molten metal inlet 101, and the side wall of the furnace body 2 has a magnesium steam inlet 201, a magnesium steam outlet 202, and a molten metal outlet 203. The molten metal outlet 203 is connected to the inlet of the molten metal circulation system 3 through a pipeline, and the outlet of the molten metal circulation system 3 is connected to the molten metal inlet 101 through a pipeline. The furnace body 2 is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter media zone from bottom to top; a ceramic grate 204 is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate 205 is provided between the middle impurity removal zone and the top filter media zone.

[0050] The magnesium vapor inlet 201 and the molten metal outlet 203 are located on the furnace wall of the bottom guide zone, and the magnesium vapor inlet 201 is higher than the molten metal outlet 203. An inclined guide plate 206 is provided between the magnesium vapor inlet 201 and the molten metal outlet 203.

[0051] The central impurity removal zone contains a ceramic ball filling layer 207, which is composed of several ceramic balls of the same diameter. A number of square grate holes are evenly distributed on the ceramic grate 204, the size of which is smaller than the diameter of the ceramic balls.

[0052] Example 6 The magnesium steam purification device for solid-liquid reaction magnesium metallurgy in this embodiment includes a sealed furnace cover 1 and a furnace body 2. The furnace cover 1 has a molten metal inlet 101, and the side wall of the furnace body 2 has a magnesium steam inlet 201, a magnesium steam outlet 202, and a molten metal outlet 203. The molten metal outlet 203 is connected to the inlet of the molten metal circulation system 3 through a pipeline, and the outlet of the molten metal circulation system 3 is connected to the molten metal inlet 101 through a pipeline. The furnace body 2 is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter media zone from bottom to top; a ceramic grate 204 is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate 205 is provided between the middle impurity removal zone and the top filter media zone.

[0053] The magnesium vapor inlet 201 and the molten metal outlet 203 are located on the furnace wall of the bottom guide zone, and the magnesium vapor inlet 201 is higher than the molten metal outlet 203. An inclined guide plate 206 is provided between the magnesium vapor inlet 201 and the molten metal outlet 203.

[0054] The central impurity removal zone contains a ceramic ball filling layer 207, which is composed of several ceramic balls of the same diameter. A number of square grate holes are evenly distributed on the ceramic grate 204, the size of which is smaller than the diameter of the ceramic balls.

[0055] The top filter media area contains molten metal 208, and several round holes are evenly distributed on the distribution plate 205.

[0056] The melting point of molten metal 208 is no greater than 1200℃, it is not soluble in magnesium, and the evaporation pressure at the working temperature is lower than that of magnesium.

[0057] Valves are provided on the molten metal inlet 101, magnesium vapor inlet 201, magnesium vapor outlet 202 and molten metal outlet 203.

Claims

1. A magnesium steam purification device for solid-liquid reactive magnesium metallurgy, characterized in that, The furnace includes a sealed furnace cover (1) and a furnace body (2). The furnace cover (1) has a molten metal inlet (101), and the side wall of the furnace body (2) has a magnesium vapor inlet (201), a magnesium vapor outlet (202), and a molten metal outlet (203). The molten metal outlet (203) is connected to the inlet of the molten metal circulation system (3) through a pipeline, and the outlet of the molten metal circulation system (3) is connected to the molten metal inlet (101) through a pipeline. The furnace body (2) is divided into a bottom flow guiding zone, a middle impurity removal zone and a top filter material zone from bottom to top. A ceramic grate (204) is provided between the bottom flow guiding zone and the middle impurity removal zone, and a distribution plate (205) is provided between the middle impurity removal zone and the top filter material zone.

2. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 1, characterized in that, The magnesium vapor inlet (201) and the molten metal outlet (203) are located on the furnace wall of the bottom guide zone, and the magnesium vapor inlet (201) is higher than the molten metal outlet (203). An inclined guide plate (206) is provided between the magnesium vapor inlet (201) and the molten metal outlet (203).

3. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 1, characterized in that, The central impurity removal zone contains a ceramic ball filling layer (207), which is composed of several ceramic balls of the same diameter.

4. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 3, characterized in that, The ceramic grate (204) has several square grate holes evenly distributed on it, and the size of the grate holes is smaller than the diameter of the ceramic ball.

5. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 1, characterized in that, The top filter material area contains molten metal (208), and several round holes are evenly distributed on the distribution plate (205).

6. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 5, characterized in that, The molten metal (208) has a melting point of no more than 1200°C, is not soluble in magnesium, and has an evaporation pressure lower than that of magnesium at the operating temperature.

7. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 1, characterized in that, Valves are provided on the molten metal inlet (101), magnesium vapor inlet (201), magnesium vapor outlet (202), and molten metal outlet (203).

8. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 1, characterized in that, The molten metal circulation system (3) includes a molten metal storage tank (301) and an electromagnetic pump (302) connected by a pipeline. The molten metal storage tank (301) is provided with a loading port (303) and a heating system. The outlet of the molten metal storage tank (301) is connected to the inlet of the electromagnetic pump (302). A valve is provided on the pipeline connecting the molten metal storage tank (301) and the electromagnetic pump (302).

9. The magnesium steam purification device for solid-liquid reactive magnesium metallurgy according to claim 1, characterized in that, The furnace wall of the furnace body (2) consists of an outer shell, an insulation layer and an inner lining layer from the outside to the inside, and a heating wire is provided in the insulation layer.

10. A method for purifying magnesium vapor in solid-liquid reactive magnesium metallurgy, comprising purifying magnesium vapor using the magnesium vapor purification device for solid-liquid reactive magnesium metallurgy as described in any one of claims 1 to 9, characterized in that, The specific steps are as follows: Step 1: Melt the metal block into molten metal through a molten metal circulation system (208). Step 2: Construct a vacuum environment inside the furnace body (2), heat and maintain the furnace body (2) to the required process temperature; Step 3: The molten metal (208) is transported to the top filter material area, and magnesium vapor is introduced for purification at the same time; Step 4: Circulate the molten metal (208) to purify the magnesium vapor until purification is complete.

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