A continuous heating method for microwave metallurgy and microwave metallurgical furnace

Abstract

The present invention discloses a continuous heating method and a microwave metallurgical furnace for microwave metallurgy, wherein the continuous heating method is to divide a furnace arranged in a furnace body into an upper furnace and a lower furnace, the upper furnace is made of wave-transmitting refractory material, and the lower furnace is made of wave-absorbing heating material; in the early stage of smelting, microwaves are used to penetrate the upper furnace to heat and smelt the solid raw materials in the furnace, and when the solid raw materials are heated to form liquid in the lower furnace, the liquid is continuously heated by wave-absorbing heating in the lower furnace, so that the temperature in the furnace continues to rise. The present invention can maintain a continuous heating state in the microwave metallurgical furnace, provide sufficient temperature conditions for subsequent reactions in the furnace, and thus improve the quality and efficiency of microwave metallurgy.

Description

Technical Field

[0001] The invention relates to a continuous heating method for microwave metallurgy and a microwave metallurgical furnace, belonging to the technical field of microwave metallurgy. Background Art

[0002] The application of microwave heating in metallurgy is a new metallurgical technology developed in recent years. Some developed countries in the world, such as the United States, Britain, Germany, Japan, Canada, Australia, etc., attach great importance to the research of this new technology. my country also started research in this field in the 1980s. Although the application of microwave heating in metallurgy is still in the development stage, many extremely important research results have been achieved. For example, by irradiating carbon and 17 oxides and sulfides with microwaves (2450MHz, 800W), some compounds can be heated to several hundred degrees Celsius within one minute. Experiments have shown that microwave heating can promote the pre-reduction of nickel oxide, cobalt oxide and manganese oxide ore before leaching, and can promote the roasting and chlorination of molybdenum sulfide and rhenium sulfide. Almost all metals used in industry can be treated with microwaves. In the late 1980s, the pretreatment of refractory gold ores, the recovery of gold from low-grade ores and tailings, the extraction of rare metals and heavy metals from ores, the carbon thermal reduction of iron ore and vanadium-titanium magnetite, the treatment of industrial waste, etc.

[0003] Microwave heating is different from traditional heating. It does not require heat conduction from the surface to the inside, but directly heats the material through the energy dissipation of microwaves inside the material. Depending on the properties of the material (conductivity, magnetic permeability, dielectric constant), microwaves can directly and effectively generate heat throughout the material. The application of microwaves in metallurgy has the following advantages that traditional heating methods cannot match:

[0004] (1) Selectively heat materials, with fast heating rate and high heating efficiency;

[0005] (2) Microwaves can promote both endothermic and exothermic reactions and have a catalytic effect on chemical reactions;

[0006] (3) When microwave heating replaces traditional heating, smelting and other high-temperature chemical reactions can be carried out at very low temperatures, that is, microwave heating has the effect of lowering the temperature of chemical reactions;

[0007] (4) Microwave energy can cause atoms and molecules to vibrate at high speed, thus creating more favorable thermodynamic conditions for chemical reactions;

[0008] (5) Microwaves can easily heat polar liquids (such as water, ethanol, various acid and alkali solutions, etc.). Therefore, microwave heating can be used to promote the dissolution of minerals in solvents, increase the leaching rate in hydrometallurgical processes, and reduce energy consumption in the process.

[0009] (6) Microwaves themselves do not produce any gas. Only the gas produced by the reduction or oxidation reaction needs to be purified, which is beneficial to the environment.

[0010] (7) Easy to control automatically.

[0011] However, the applicant has found that when microwave metallurgy is used, when the temperature rises to a certain level, the temperature in the furnace cannot continue to rise, which will affect subsequent reactions in the furnace and thus affect the quality and efficiency of microwave metallurgy.

[0012] After searching, no patents identical or similar to this application have been found, but some patent documents on microwave metallurgy have been found as follows:

[0013] 1. A Chinese invention patent with application publication number CN 107990712 A and application publication date May 4, 2018 discloses a microwave protection method in a microwave metallurgical furnace. A microwave protection method in a microwave metallurgical furnace is according to the following steps: a shell is provided, the inner wall and the bottom of the shell are both provided with a microwave protection layer, the bottom of the shell is provided with a support frame, the inner cavity of the shell is provided with a reaction chamber, the outer side of the reaction chamber is provided with a heat preservation layer, the outer side of the heat preservation layer is provided with a microwave generator, the inner wall and the bottom of the reaction chamber are both provided with a crucible layer, the side wall of the reaction chamber is provided with a plurality of magnetrons, and the magnetrons respectively penetrate the crucible layer, the reaction chamber and the heat preservation layer.

[0014] temperature layer, and one end of the magnetron is connected to the microwave generator, and the other end extends into the interior of the reaction bin, the inner cavity of the reaction bin is provided with a material blocking net, and the material blocking net is fixedly connected to the inner wall of the reaction bin, a discharge channel is provided at the bottom of the reaction bin, a control valve is provided on the discharge channel, a slag discharge port is provided on one side of the discharge channel, a feed port is provided at the top of the reaction bin, a sealing cover is provided at the top of the feed port, exhaust gas pipes and gas exchange pipes are symmetrically provided on both sides of the feed port, one end of the exhaust gas pipe and the gas exchange pipe both penetrate the reaction bin and the top of the shell and extend into the interior of the reaction bin, the other end of the exhaust gas pipe is connected to an air purifier, the other end of the gas exchange pipe is connected to branch pipe one and branch pipe two, the other end of branch pipe one is connected to a high-pressure air pump, and the other end of branch pipe two is connected to a high-pressure air pump. A vacuum pump is connected, and the microwave generator, air purifier, high-pressure air pump and vacuum pump are all connected to an external power supply through electric wires; the sealing cover is opened to put in the material, and the microwave generator is turned on to smelt the material. During the reaction of the material, if a reaction atmosphere or vacuum condition needs to be introduced, it can be achieved by opening and closing the gas valves on branch pipe 1 and branch pipe 2. The waste gas generated by the material can be discharged through the waste gas pipeline, purified by the air purifier and then discharged into the atmosphere. The liquid after the material is melted is output through the discharge channel, and the residual waste slag from the smelting is discharged through the slag outlet; the waste gas pipeline and branch pipes 1 and 2 are all provided with gas valves; the material blocking net is parallel to the bottom of the inner cavity of the reaction bin, and the distance between the material blocking net and the bottom of the inner cavity of the reaction bin is 20 cm.

[0015] 2. A Chinese invention patent with application publication number CN 108007185 A and application publication date May 8, 2018 discloses a method for using a rotary microwave metallurgical furnace, wherein an inner partition is attached to the inner wall of the furnace body, and a plurality of magnetrons are installed on the inner wall of the inner partition, and the magnetrons are evenly and symmetrically distributed, a horizontal furnace is provided in the center of the furnace body cavity, and the left and right ends of the furnace are rotatably connected to the left and right sides of the furnace body through an external rotating shaft, and the left end of the external rotating shaft passes through the left side of the furnace body, and the inner part of the external rotating shaft is rotatably connected to the left and right sides of the furnace body. The furnace body and the inner rotating shaft of the furnace are welded with a plurality of rotating blades, and the rotating blades are evenly distributed in the inner cavity of the furnace, a feed port is arranged on the top of the furnace, a pneumatic gate valve is arranged on the top of the feed port, and the pneumatic gate valve is fixed on the top of the furnace, a feed channel is arranged on the top of the pneumatic gate valve, and the feed channel vertically penetrates the top of the furnace body, a material cover is connected to the top of the feed channel through a rotating hinge, and the material cover is sealed on the top of the feed channel, and a discharge port is arranged at the bottom of the furnace. The invention relates to a material discharging channel, and the discharging channel vertically passes through the bottom of the furnace body, a marking rod is provided on the right side of the furnace body, and the marking rod is vertically connected to the top of the outer rotating shaft, the left ends of the outer rotating shaft and the inner rotating shaft are connected to the frequency conversion motor through a chain belt, and the frequency conversion motor is connected to the left side of the furnace body through a bracket; when in use, first open the material cover, then open the feed port through the pneumatic gate valve, and then add the material into the furnace through the feed channel and the feed port, then close the material cover and the pneumatic gate valve, then turn on the magnetron to emit microwaves, start the frequency conversion motor to rotate, drive the outer rotating shaft and the inner rotating shaft to rotate through the chain belt, so that the outer rotating shaft drives the furnace to rotate in the inner cavity of the furnace body, and the inner rotating shaft drives the rotating blades to stir the material in the furnace, so that the material is fully heated in the microwave field, and the inner partition is provided to reflect microwaves well, insulate and keep heat, and prevent heat loss. When the heating is completed, the marking rod is rotated to a downward vertical direction so that the feed port is located directly above the discharging channel, and then the pneumatic gate valve is opened to allow the material to flow out of the discharging channel.

[0016] 3. A Chinese invention patent with authorization announcement number CN 207600173 U and application publication date July 10, 2018 discloses a microwave metallurgical heating furnace, which includes: an inner wall and an outer wall with a circular cross-section; a plurality of magnetrons are fixedly connected to the inner surface of the outer wall, a feed port and a discharge port are provided on the outer wall, an inner wall port is provided on the inner wall, and the inner wall port, the feed port and the discharge port are within one cross-section; both ends of the inner wall are fixedly connected to a rotating shaft, the rotating shaft passes through the outer wall and is driven to rotate by a first driving device; a stirring shaft passes through the inside of the rotating shaft, and the stirring shaft passes through one end of the rotating shaft and is driven to rotate by a second driving device.

[0017] None of the above patent documents involve the technical problem to be solved by this application.

[0018] In summary, how to design a continuous heating method and a microwave metallurgical furnace for microwave metallurgy so that the continuous heating state in the microwave metallurgical furnace can be maintained to provide sufficient temperature conditions for subsequent reactions in the furnace, thereby improving the quality and efficiency of microwave metallurgy is a technical problem that needs to be solved urgently. Summary of the invention

[0019] The technical problem to be solved by the present invention is to provide a continuous heating method and a microwave metallurgical furnace for microwave metallurgy in view of the defects existing in the prior art, which can maintain a continuous heating state in the microwave metallurgical furnace and provide sufficient temperature conditions for subsequent reactions in the furnace, thereby improving the quality and efficiency of microwave metallurgy.

[0020] In order to solve the above technical problems, the technical solution adopted by the present invention is: a continuous heating method for microwave metallurgy, which is to divide the furnace chamber arranged in the furnace body into an upper furnace chamber and a lower furnace chamber, the upper furnace chamber is made of wave-transmitting refractory material, and the lower furnace chamber is made of wave-absorbing heating material; in the early stage of smelting, microwaves are used to penetrate the upper furnace chamber to heat and smelt the solid raw materials in the furnace chamber, and when the solid raw materials are heated to form liquid in the lower furnace chamber, the liquid is continued to be heated by wave-absorbing heat in the lower furnace chamber, so that the temperature in the furnace chamber continues to rise.

[0021] Preferably, the wave-transmitting refractory material is made of corundum or silicon nitride, and the wave-absorbing and heating material is made of silicon carbide.

[0022] Preferably, the height of the lower furnace is equal to the height of the liquid formed in the furnace.

[0023] The present invention also discloses a microwave metallurgical furnace, comprising a furnace body and a furnace chamber arranged inside the furnace body, a microwave opening and a feed port are arranged on the upper part of the furnace body, a slag outlet and a liquid outlet are arranged on the lower side of the furnace body, and the furnace chamber comprises an upper furnace chamber made of wave-transmitting refractory material and a lower furnace chamber made of wave-absorbing heat-generating material.

[0024] Preferably, an upper opening corresponding to the position of the feed port is provided on the upper furnace, and the upper opening is connected to the feed port; lower opening one and lower opening two are also provided on the lower furnace, lower opening one is connected to the liquid outlet, and lower opening two is connected to the slag outlet.

[0025] Preferably, the furnace is cylindrical.

[0026] Preferably, the bottom of the lower furnace is configured as an arc-shaped bottom.

[0027] Preferably, a microwave introduction tube is also provided on the microwave opening, and the microwave introduction tube includes a conical tube and a cylindrical tube, one end of the cylindrical tube is connected to the large end of the conical tube, and the other end of the cylindrical tube is connected to the microwave opening of the furnace body.

[0028] Preferably, a microwave suppressor is provided at both the slag outlet and the liquid outlet, and the microwave suppressor includes an outer cylinder, a plurality of reflective plates sequentially arranged inside the outer cylinder along the axial direction of the outer cylinder, and a tube body passing through the outer cylinder along the axial direction of the outer cylinder; one end of the tube body is connected to the slag outlet or the liquid outlet.

[0029] Preferably, the bottom of the furnace body is open, and a furnace body bottom cover is provided on the bottom of the furnace body, and the furnace body bottom cover is detachably connected to the bottom of the furnace body.

[0030] The beneficial effects of the present invention are as follows: in the early stage of metallurgy, the present invention uses microwaves to penetrate the upper furnace to heat and smelt the solid raw materials in the furnace. After the liquid is formed in the lower furnace, the liquid is not directly heated by microwaves, but the lower furnace is heated by microwaves, and the liquid is heated by the lower furnace again, thereby continuously increasing the temperature in the furnace, ensuring the continuation of subsequent reactions. Therefore, the present invention can maintain the continuous heating state in the microwave metallurgical furnace, provide sufficient temperature conditions for subsequent reactions in the furnace, thereby improving the quality and efficiency of microwave metallurgy. The height of the lower furnace is equal to the height of the liquid formed in the furnace, which is convenient for heating the liquid and significantly improving the temperature in the furnace. The furnace is set to be cylindrical, so that slag accumulation is avoided at the corner of the furnace during the smelting process, making the furnace easy to clean and improving the service life of the furnace. The bottom of the lower furnace is set to be arc-shaped, which can facilitate the outflow of liquid and make the liquid outflow extremely thorough. By setting a cone tube, the microwave power can be diffused, the effective area can be expanded, and the raw materials can be evenly heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of a microwave metallurgical furnace in an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the axial cross-sectional structure of a microwave metallurgical furnace in an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the axial cross-sectional structure of the microwave suppressor in an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of a half-section three-dimensional structure of a microwave suppressor in an embodiment of the present invention;

[0035] In the figure: 1. furnace body, 2. upper furnace, 211. overlapping portion 1, 3. lower furnace, 311. overlapping portion 2, 4. microwave breach, 5. feed port, 6. slag outlet, 7. liquid outlet, 8. screw conveyor, 9. upper opening, 10. lower opening 1, 11. lower opening 2, 12. conical tube, 13. cylindrical tube, 14. outer cylinder, 141. outer flange, 15. reflecting plate, 16. tube body, 17. spacer, 18. connecting plate, 19. through hole, 20. gap 1, 21. gap 2, 22. air hole, 23. furnace body bottom cover. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Example: Figure 1 and Figure 2 As shown, a continuous heating method for microwave metallurgy is provided, which is to divide the furnace chamber arranged in the furnace body 1 into an upper furnace chamber 2 and a lower furnace chamber 3, the upper furnace chamber 2 is made of wave-transmitting refractory material, and the lower furnace chamber 3 is made of wave-absorbing heating material; in the early stage of smelting, microwaves are used to penetrate the upper furnace chamber 2 to heat and smelt the solid raw materials in the furnace chamber, and when the solid raw materials are heated to form liquid in the lower furnace chamber 3, the liquid is continuously heated by the wave-absorbing heat generated by the lower furnace chamber 3, so that the temperature in the furnace chamber continues to rise. The applicant has found through research that when microwave metallurgy is carried out, powdered solid raw materials accumulate in the furnace, and microwaves penetrate the furnace to directly heat the powdered solid raw materials, causing the temperature in the furnace to rise. After a period of time, part of the powdered solid raw materials are liquefied to form liquid at the bottom of the furnace. Since the liquid surface has poor wave absorption capacity, the temperature in the furnace will not continue to rise, thereby affecting subsequent reactions. In this embodiment, in the early stage of metallurgy, microwaves are used to penetrate the upper furnace to heat and smelt the solid raw materials in the furnace. After liquid is formed in the lower furnace, the liquid is not directly heated by microwaves, but the lower furnace is heated by microwaves, and the liquid is then heated by the lower furnace, thereby continuously increasing the temperature in the furnace and ensuring the continuation of subsequent reactions. Therefore, this embodiment can maintain a continuous heating state in the microwave metallurgical furnace, provide sufficient temperature conditions for subsequent reactions in the furnace, thereby improving the quality and efficiency of microwave metallurgy.

[0038] In this embodiment, the wave-transmitting refractory material is preferably made of materials such as corundum or silicon nitride, and the wave-absorbing and heating material is preferably made of materials such as silicon carbide.

[0039] The height of the lower furnace is equal to the height of the liquid formed in the furnace. In this embodiment, the height of the lower furnace accounts for 1 / 4 to 1 / 3 of the entire furnace height. This arrangement can make it easier to heat the liquid and significantly increase the temperature in the furnace.

[0040] like Figure 1 and Figure 2 As shown, the present embodiment further discloses a microwave metallurgical furnace, comprising a furnace body 1 and a furnace chamber arranged inside the furnace body 1, a heat-insulating material (not shown in the figure) is arranged between the furnace body 1 and the furnace chamber, a microwave opening 4 and a feed port 5 are arranged on the upper part of the furnace body 1, a slag outlet 6 and a liquid outlet 7 are arranged on the lower side of the furnace body 1, and the furnace chamber comprises an upper furnace chamber 2 made of a wave-transmitting refractory material and a lower furnace chamber 3 made of a wave-absorbing and heating material.

[0041] A screw conveyor 8 is installed at the feed port 5, and an upper opening 9 corresponding to the position of the feed port 5 is also opened on the upper furnace 2, and the upper opening 9 is connected to the feed port 5. After the powdered solid raw material is fed by the screw conveyor 8, it enters the furnace through the feed port 5 and the upper opening 9 in sequence. A lower opening 10 and a lower opening 2 11 are also provided on the lower furnace 3, and the lower opening 10 is connected to the liquid outlet 7, and the lower opening 2 11 is connected to the slag outlet 6. The liquid and waste slag after smelting are discharged from the liquid outlet and the slag outlet respectively.

[0042] In this embodiment, the furnace body 1 is set to be cylindrical, and the furnace is also set to be cylindrical. In the prior art, the furnace is set to be square, which leads to the phenomenon of slag accumulation at the corners of the furnace during the smelting process. After long-term use, the accumulation phenomenon becomes more and more serious and difficult to clean. In this embodiment, the furnace is set to be cylindrical, which avoids the formation of slag accumulation at the corners of the furnace during the smelting process, makes the furnace easy to clean, and increases the service life of the furnace.

[0043] The bottom of the lower furnace 3 is set as an arc bottom. After repeated tests by the applicant, it is found that when the bottom of the lower furnace is set as an arc, it is easy to flow out of the liquid, making the liquid out very thoroughly.

[0044] The upper furnace 2 is provided with a first overlap portion 211 at the bottom, and the lower furnace 3 is provided with a second overlap portion 311 at the top. The first overlap portion 211 and the second overlap portion 311 cooperate with each other to overlap the upper furnace 2 and the lower furnace 3 to form a furnace. By designing the overlap structure, it is convenient to replace the upper furnace or the lower furnace during maintenance work.

[0045] A microwave introduction tube is also provided on the microwave opening 4, and the microwave introduction tube includes a cone tube 12 and a column tube 13, one end of the column tube 13 is connected to the large end of the cone tube 12, and the other end of the column tube 13 is connected to the microwave opening 4 of the furnace body, and the small end of the cone tube 12 is connected to the microwave source. By providing the cone tube, microwave power can be diffused, the effective area can be expanded, and the raw materials can be evenly heated.

[0046] like Figures 2 to 4As shown, microwave suppressors (not shown in the figure) are arranged on the slag outlet 6 and the liquid outlet 7, and the microwave suppressors include an outer cylinder 14, a multi-layer reflector 15 sequentially arranged inside the outer cylinder 14 along the axial direction of the outer cylinder 14, and a tube 16 passing through the outer cylinder 14 along the axial direction of the outer cylinder 14; one end of the tube 16 is connected to the slag outlet 6 or the liquid outlet 7. When microwaves are discharged with the slag or liquid, the microwaves discharged with the slag or liquid are formed into reflected waves of microwaves through the reflector, and the frequency of the reflected waves is the same as that of the microwaves, but the direction is opposite, so that the microwaves discharged with the slag or liquid are suppressed by the mutual cancellation of the reflected waves and microwaves.

[0047] The bottom of the outer cylinder 14 is open, and an outer flange 141 is provided at the bottom of the outer cylinder 14. The outer flange 141 is locked to the connecting plate 18 by passing a screw 1 (not shown in the figure). A spacer 17 is provided between the multi-layer reflective plates 15. A through hole 19 is provided on the top of the outer cylinder 14. The multi-layer reflective plates 15 are connected to the outer cylinder 14 by passing a screw 2 through the through hole 19 and the spacer 17. In this embodiment, spacers 17 are provided between adjacent reflective plates 15 and between the top reflective plate 15 and the inner top of the outer cylinder 14. A gap 20 is left between the multi-layer reflective plate 15 and the tube body 16. One end of the tube body 16 is connected to the slag outlet 6 or the liquid outlet 7, and the other end passes through the connecting plate 18, the multi-layer reflective plate 15 and the outer cylinder 14 and is exposed to the outer cylinder 14. A gap 21 is left between the tube body 16 and the connecting plate 18, and the gap 21 is connected to the inner space of the outer cylinder 14. An air hole 22 connected to the inner space of the outer cylinder is also provided on the top of the outer cylinder 14.

[0048] like Figure 2 As shown, the bottom of the furnace body 1 is open, and a furnace body bottom cover 23 is also provided on the bottom of the furnace body 1, and the furnace body bottom cover 23 is detachably connected to the bottom of the furnace body 1. This facilitates inspection and maintenance. In this embodiment, the diameter of the bottom opening of the furnace body 1 is larger than the diameter of the furnace chamber, so that when the entire furnace chamber or the lower furnace chamber needs to be replaced, the furnace chamber or the lower furnace chamber can be taken out from the bottom opening of the furnace body.

[0049] In summary, in the early stage of metallurgy, the present invention uses microwaves to penetrate the upper furnace to heat and smelt the solid raw materials in the furnace. After the liquid is formed in the lower furnace, the liquid is not directly heated by microwaves, but the lower furnace is heated by microwaves, and the liquid is heated by the lower furnace again, thereby continuously increasing the temperature in the furnace, ensuring the continuation of subsequent reactions. Therefore, the present invention can maintain a continuous heating state in the microwave metallurgical furnace, provide sufficient temperature conditions for subsequent reactions in the furnace, thereby improving the quality and efficiency of microwave metallurgy. The height of the lower furnace is equal to the height of the liquid formed in the furnace, which is convenient for heating the liquid and significantly improving the temperature in the furnace. The furnace is set to a cylindrical shape, which avoids the formation of slag accumulation at the corner of the furnace during the smelting process, makes the furnace easy to clean, and improves the service life of the furnace. The bottom of the lower furnace is set to an arc shape, which can facilitate the outflow of liquid and make the liquid outflow extremely thorough. By setting a conical tube, the microwave power can be diffused, the effective area can be expanded, and the raw materials can be evenly heated.

[0050] The "multiple" mentioned in the above embodiments refers to the number of "two or more". The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those skilled in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A continuous heating method for microwave metallurgy, characterized in that: The furnace chamber arranged in the furnace body is divided into an upper furnace chamber and a lower furnace chamber. The upper furnace chamber is made of wave-transmitting refractory materials, and the lower furnace chamber is made of wave-absorbing and heating materials. In the early stage of smelting, microwaves are used to penetrate the upper furnace chamber to heat and smelt the solid raw materials in the furnace chamber. When the solid raw materials are heated to form liquid in the lower furnace chamber, the liquid is further heated by the wave-absorbing and heating heat in the lower furnace chamber, thereby causing the temperature in the furnace chamber to continue to rise.

2. The continuous heating method according to claim 1, characterized in that: The wave-transmitting refractory material is made of corundum or silicon nitride, and the wave-absorbing and heating material is made of silicon carbide.

3. The continuous heating method according to claim 1 or 2, characterized in that: The height of the lower furnace is equal to the height of the liquid formed in the furnace.

4. A microwave metallurgical furnace, comprising a furnace body and a furnace arranged inside the furnace body, a microwave opening and a feed port are arranged at the upper part of the furnace body, and a slag outlet and a liquid outlet are arranged at the lower side of the furnace body, characterized in that: The furnace comprises an upper furnace made of wave-transmitting refractory material and a lower furnace made of wave-absorbing and heating material; A microwave suppressor is provided on both the slag outlet and the liquid outlet, and the microwave suppressor comprises an outer cylinder, a multi-layer reflective plate arranged in sequence inside the outer cylinder along the axial direction of the outer cylinder, and a tube body passing through the outer cylinder along the axial direction of the outer cylinder; one end of the tube body is connected to the slag outlet or the liquid outlet; The bottom of the furnace body is open, and a furnace body bottom cover is arranged on the bottom of the furnace body. The furnace body bottom cover is detachably connected to the bottom of the furnace body.

5. The microwave metallurgical furnace according to claim 4, characterized in that: An upper opening corresponding to the position of the feed port is also provided on the upper furnace, and the upper opening is connected to the feed port; a lower opening 1 and a lower opening 2 are also provided on the lower furnace, and the lower opening 1 is connected to the liquid outlet, and the lower opening 2 is connected to the slag outlet.

6. The microwave metallurgical furnace according to claim 4, characterized in that: The furnace is cylindrical.

7. The microwave metallurgical furnace according to claim 4, characterized in that: The bottom of the lower furnace is configured as an arc-shaped bottom.

8. The microwave metallurgical furnace according to claim 4, characterized in that: A microwave introduction tube is also arranged on the microwave breach, and the microwave introduction tube includes a cone tube and a column tube, one end of the column tube is connected to the large end of the cone tube, and the other end of the column tube is connected to the microwave breach of the furnace body.

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