Microwave plasma device and application thereof in vanadium titano-magnetite smelting

Abstract

The invention discloses a microwave plasma device and application of the microwave plasma device in vanadium titano-magnetite smelting, and belongs to the technical field of vanadium titano-magnetite smelting. The device comprises a base, a heating groove is fixedly connected to the upper portion of the base, and a heating bin is fixedly connected to the upper portion of the base; a plurality of microwave heating devices are fixedly connected to the upper portion of the heating bin, a conveying device is arranged in the heating tank, and an air supply system is fixedly connected to the top of the heating bin; the microwave heating equipment comprises a magnetic control channel, a magnetron is fixedly connected to the upper portion of the right side of the magnetic control channel, a cooling fan is arranged on the right side of the magnetron, a power transformer is fixedly connected to the lower portion of the magnetron, and the power transformer is electrically connected with the cooling fan and the magnetron. The plasma device provided by the invention has the characteristics of high operation efficiency, low energy consumption and the like, and has advantages in vanadium titano-magnetite smelting.

Description

Technical Field

[0001] The invention relates to the technical field of vanadium-titanium magnetite smelting, and in particular to a microwave plasma device and application thereof in vanadium-titanium magnetite smelting. Background Art

[0002] Titanium-based materials are widely used in aerospace, chemical, marine engineering, medical equipment and other fields due to their excellent strength-to-weight ratio, corrosion resistance, high temperature resistance and biocompatibility, becoming a key material for many high-end equipment and technologies.

[0003] The traditional vanadium-titanium magnetite smelting technology has been gradually replaced by new technologies due to its disadvantages of high energy consumption, large exhaust gas emissions, and difficulty in separating impurities from finished products. For example, some researchers use plasma technology to smelt vanadium-titanium magnetite.

[0004] Plasma smelting technology is a new technology that uses the high temperature and high energy density of plasma to perform smelting. It can quickly decompose impurities in ores at extremely high temperatures, especially when dealing with metal impurities such as iron, with high selectivity and efficiency, thereby effectively improving the purity of the metal and producing higher quality titanium materials.

[0005] However, if traditional plasma is used to smelt vanadium-titanium magnetite, the following disadvantages exist: plasma smelting requires a large amount of energy to maintain the high temperature and high energy density of the plasma, resulting in large energy consumption, thereby increasing the smelting cost. In the face of the above problems, some researchers have proposed combining microwave heating technology with plasma smelting technology, but most of the existing microwave plasma smelting devices are in the experimental stage. If they are applied to industrial production, the following problems exist: during the continuous loading and unloading of the equipment, the plasma generated at high temperature is prone to leakage. Intermittent loading and unloading also has this technical problem, and intermittent loading and unloading leads to low efficiency in smelting vanadium-titanium magnetite. Therefore, the inventor intends to design a microwave plasma device for industrial production. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a microwave plasma device and its application in vanadium-titanium magnetite smelting.

[0007] The technical solution of the present invention is: a microwave plasma device, comprising a base, a heating tank is fixedly connected to the top of the base, a heating chamber is fixedly connected to the top of the base, a plurality of microwave heating devices are fixedly connected to the top of the heating chamber, a feeding device is arranged in the heating tank, and a gas supply system is fixedly connected to the top of the heating chamber;

[0008] The microwave heating device comprises a magnetron channel, a magnetron is fixedly connected to the upper right side of the magnetron channel, a heat dissipation fan is arranged on the right side of the magnetron, a power transformer is fixedly connected to the lower side of the magnetron, and the power transformer is electrically connected to the heat dissipation fan and the magnetron.

[0009] Furthermore, the feeding device includes a spiral feeding rod, a feeding motor is fixedly connected to the left side of the heating tank, and the output shaft of the feeding motor is drivingly connected to the spiral feeding rod, a feeding port is provided at the lower right end of the heating tank, a feeding bin is provided at the upper left end of the heating tank, the outer wall of the feeding bin is supported by the ground through a supporting rod, and the bottom of the feeding bin is communicated with the heating tank, a left cover plate is fixedly connected to the upper left side of the heating tank, the left ends of the left cover plate are fixedly connected to the feeding bin and the outer wall of the heating bin respectively, and a right cover plate is fixedly connected to the upper right side of the heating tank, and the left end of the right cover plate is fixedly connected to the outer wall of the heating bin.

[0010] Description: The spiral feed rod is made of ceramic material. The mixed powder is moved through the spiral feed rod. The left cover and the right cover can prevent the gas in the heating chamber from escaping, avoiding safety accidents caused by the overflow of carbon monoxide gas in the heating chamber.

[0011] Furthermore, a rotary fan is fixedly connected to each of the left and right sides of the top of the heating bin, and the rotary fan includes a rotating motor. The rotating motor is fixed to the top of the heating bin, and the output shaft of the rotating motor passes through the wall of the heating bin and is fixedly connected to the fan blades. The rotating motor is electrically connected to the power transformer.

[0012] Description: The rotary fan improves the uniformity of the air temperature in the heating chamber.

[0013] Furthermore, the air supply system includes an air bin, the bottom of which is fixedly connected to the top of the heating bin, an exhaust fan is fixedly connected to the bottom of the air bin, an air outlet of the exhaust fan is connected to a jet pipe, a lower end of the jet pipe is connected to the interior of the heating bin, return air channels are provided on both sides of the heating bin, the top of the return air channel is connected to a return air duct, and an upper end of the return air duct is connected to the air bin.

[0014] Description: Carbon dioxide gas is sprayed into the jet pipe and used as the protective gas. Carbon powder reacts to generate carbon monoxide gas under the protection of carbon dioxide gas. Microwaves make the carbon monoxide gas form plasma and react with mineral powder to generate elemental iron and titanium. The injected carbon dioxide is recovered through the return air channel.

[0015] Furthermore, an air compressor is fixedly connected to the right side of the air bin, the air inlet of the air compressor is connected to the air bin, the air outlet of the air compressor is connected to an air storage tank, and a control valve 1 is provided at the connection point, the front side of the air storage tank is connected to an air supply pipe, the end of the air supply pipe is connected to the injection pipe, and a control valve 2 is provided at the connection point.

[0016] Description: The air compressor compresses and stores the carbon dioxide gas in the air bin, and fills the carbon dioxide gas into the heating bin before the equipment is started, so that the heating bin forms a carbon dioxide atmosphere. This can reduce the oxygen content in the heating bin and avoid the carbon powder directly forming carbon dioxide gas at the initial stage of the reaction, resulting in a waste of raw materials.

[0017] Furthermore, a preheating tank is provided at the lower left side of the heating tank, an air equalizing box is provided at the bottom of the preheating tank, the lower end of the air equalizing box is connected with an overflow pipe, a regulating valve is provided at the connection between the overflow pipe and the air equalizing box, an electronic igniter and a plurality of nozzles are fixedly connected to the top of the air equalizing box, the nozzles are communicated with the interior of the air equalizing box, and a plurality of exhaust holes are provided on the side wall of the preheating tank.

[0018] Note: The total amount of carbon dioxide gas formed after carbon monoxide gas participates in the redox reaction will continue to increase with the reaction. The gas recovered from the air bin contains a mixed gas of carbon monoxide and carbon dioxide. This part of the gas is fully burned to preheat the mixed powder, which can improve the utilization efficiency of the waste gas and form non-toxic carbon dioxide gas.

[0019] Furthermore, the heating warehouse comprises a warehouse wall, a fire-resistant heat-insulating layer is provided on the inner side of the warehouse wall, and a reflective layer is fixedly connected to the inner side of the fire-resistant heat-insulating layer.

[0020] Description: The refractory layer can effectively prevent the heat loss in the heating chamber, and the reflective layer can reflect the microwaves in the heating chamber to improve the heating efficiency of the microwaves.

[0021] On the other hand, the present invention also provides an application of a microwave plasma device, which is applied to the smelting of vanadium-titanium magnetite.

[0022] The beneficial effects of the present invention are:

[0023] (1) The present invention heats carbon powder by microwaves, so that the carbon powder forms carbon monoxide gas under the protection of carbon dioxide gas. The carbon monoxide gas is formed into a plasma state by microwaves to participate in the reaction of mineral powder, and impurities such as iron oxide in the mineral powder are reduced to a single substance. The gas generated by the reaction is fully burned in a preheating tank to form carbon dioxide and discharged. The heat generated is used as energy for preheating the mineral powder, thereby significantly improving the operating efficiency of the device and reducing the energy consumption required for the reaction. It is quite advantageous in the smelting of vanadium-titanium magnetite.

[0024] (2) Compared with the plasma formed by hydrogen for mineral powder reduction, the present invention is based on carbon powder for reaction, which significantly reduces the safety risk of device operation;

[0025] (3) The device of the present invention is used for smelting vanadium-titanium magnetite, and the purity of TiO2 in the product can be as high as 83% or more, which is better than the existing traditional smelting technology (about 75%). BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0028] Figure 3 It is a left view of the connection relationship between the heating chamber and the heating tank of the present invention.

[0029] Figure 4 It is a partial cross-sectional view of the heating chamber of the present invention.

[0030] Among them, 1-base, 2-heating tank, 3-heating chamber, 4-microwave heating equipment, 5-feeding device, 6-air supply system, 41-magnetic control channel, 42-magnetron, 43-cooling fan, 44-power transformer, 51-screw feed rod, 52-feeding motor, 53-feeding port, 54-feeding bin, 21-left cover, 22-right cover, 45-rotating fan, 451-rotating motor, 452-fan blade , 61-air bin, 62-exhaust fan, 63-injection pipe, 64-return air channel, 65-return air pipe, 66-air compressor, 67-gas storage tank, 68-control valve one, 69-air supply pipe, 691-control valve two, 7-preheating tank, 71-gas equalization box, 72-overflow pipe, 73-regulating valve, 74-electronic igniter, 75-injection head, 76-exhaust hole, 31-bin wall, 32-refractory insulation layer, 33-reflection layer. DETAILED DESCRIPTION

[0031] Embodiment 1:

[0032] like Figure 1 , Figure 3 As shown, a microwave plasma device comprises a base 1, a heating tank 2 is fixedly connected to the top of the base 1, a heating chamber 3 is fixedly connected to the top of the base 1, a plurality of microwave heating devices 4 are fixedly connected to the top of the heating chamber 3, a feeding device 5 is arranged inside the heating tank 2, and a gas supply system 6 is fixedly connected to the top of the heating chamber 3;

[0033] The microwave heating device 4 includes a magnetron channel 41, a magnetron 42 is fixedly connected to the upper right side of the magnetron channel 41, a heat dissipation fan 43 is provided on the right side of the magnetron 42, a power transformer 44 is fixedly connected to the lower side of the magnetron 42, and the power transformer 44 is electrically connected to the heat dissipation fan 43 and the magnetron 42.

[0034] The feeding device 5 includes a spiral feeding rod 51, and a feeding motor 52 is fixedly connected to the left side of the heating tank 2, and the output shaft of the feeding motor 52 is drivingly connected to the spiral feeding rod 51. A feeding port 53 is provided at the lower right end of the heating tank 2, and a feeding bin 54 is provided at the upper left end of the heating tank 2. The outer wall of the feeding bin 54 is supported by the ground through a support rod 541, and the bottom of the feeding bin 54 is communicated with the heating tank 2. A left cover plate 21 is fixedly connected to the upper left side of the heating tank 2, and the left and right ends of the left cover plate 21 are respectively fixedly connected to the feeding bin 54 and the outer wall of the heating bin 3, and a right cover plate 22 is fixedly connected to the upper right side of the heating tank 2, and the left end of the right cover plate 22 is fixedly connected to the outer wall of the heating bin 3.

[0035] The spiral feed rod 51 is made of ceramic material, and the mixed powder is moved by the spiral feed rod 51. The left cover plate 21 and the right cover plate 22 can prevent the gas in the heating chamber 3 from escaping, thereby avoiding safety accidents caused by the overflow of carbon monoxide gas in the heating chamber 3.

[0036] The air supply system 6 includes an air bin 61, the bottom of which is fixedly connected to the top of the heating bin 3, an exhaust fan 62 is fixedly connected to the bottom of the air bin 61, the air outlet of the exhaust fan 62 is connected to a jet pipe 63, the lower end of the jet pipe 63 is connected to the interior of the heating bin 3, return air channels 64 are provided on both sides of the heating bin 3, the top of the return air channel 64 is connected to a return air duct 65, and the upper end of the return air duct 65 is connected to the air bin 61.

[0037] Carbon dioxide gas is sprayed into the jet pipe 63, and carbon dioxide gas is used as a protective gas. Carbon powder reacts to generate carbon monoxide gas under the protection of carbon dioxide gas. Microwaves cause the carbon monoxide gas to form plasma and react with mineral powder to generate elemental iron and titanium. The sprayed carbon dioxide is recovered through the return air channel 64 and enters the air chamber 61 for circulation.

[0038] like Figure 4 As shown, the heating chamber 3 includes a chamber wall 31 , a fire-resistant heat-insulating layer 32 is provided on the inner side of the chamber wall 31 , and a reflective layer 33 is fixedly connected to the inner side of the fire-resistant heat-insulating layer 32 .

[0039] The refractory layer 32 can effectively prevent the heat loss of the heating chamber 3, and the reflective layer 33 can reflect the microwaves in the heating chamber to improve the heating efficiency of the microwaves.

[0040] Embodiment 2:

[0041] The difference between this embodiment and embodiment 1 is that in this embodiment, a rotary fan 45 is fixedly connected to the left and right sides of the top of the heating chamber 3 respectively, and the rotary fan 45 includes a rotating motor 451, and the rotating motor 451 is fixed to the top of the heating chamber 3. The output shaft of the rotating motor 451 passes through the wall of the heating chamber 3 and is fixedly connected with a fan blade 452, and the rotating motor 451 is electrically connected to the power transformer 44.

[0042] Compared with Example 1, the rotary fan 45 in this embodiment improves the uniformity of the air temperature in the heating chamber 3.

[0043] Embodiment 3:

[0044] The difference between this embodiment and embodiment 2 is that, in this embodiment, an air compressor 66 is fixedly connected to the right side of the air bin 61, the air inlet of the air compressor 66 is connected to the air bin 61, the air outlet of the air compressor 66 is connected to the air storage tank 67, and a control valve 1 68 is provided at the connection point, the front side of the air storage tank 67 is connected to an air supply pipe 69, the end of the air supply pipe 69 is connected to the injection pipe 63, and a control valve 2 691 is provided at the connection point.

[0045] Compared with Example 2, the air compressor 66 in this embodiment compresses and stores the carbon dioxide gas in the air bin 61, and fills the carbon dioxide gas into the heating bin 3 before the equipment is started, so that the heating bin 3 forms a carbon dioxide atmosphere, which can reduce the oxygen content in the heating bin 3 and avoid the carbon powder directly forming carbon dioxide gas in the initial stage of the reaction, resulting in waste of raw materials.

[0046] Embodiment 4:

[0047] The difference between this embodiment and embodiment 3 is that Figure 2 As shown, in this embodiment, a preheating tank 7 is provided at the lower left side of the heating tank 2, and an air equalizing box 71 is provided at the bottom of the preheating tank 7. The lower end of the air equalizing box 71 is connected with an overflow pipe 72, and a regulating valve 73 is provided at the connection between the overflow pipe 72 and the air equalizing box 71. An electronic igniter 74 and a plurality of nozzles 75 are fixedly connected to the top of the air equalizing box 71. The nozzles 75 are communicated with the interior of the air equalizing box 71, and a plurality of exhaust holes 76 are provided on the side wall of the preheating tank 7.

[0048] Compared with Example 3, in this embodiment, the total amount of carbon dioxide gas formed after the carbon monoxide gas participates in the redox reaction will continue to increase with the reaction. The gas recovered from the air bin 61 contains a mixed gas of carbon monoxide and carbon dioxide. This part of the gas is fully burned to preheat the mixed powder, which can improve the utilization efficiency of the waste gas and form non-toxic carbon dioxide gas.

[0049] Embodiment 5:

[0050] The application of a microwave plasma device described in this embodiment is based on a microwave plasma device in Example 4, and is applied to vanadium-titanium magnetite smelting, including the following steps:

[0051] S1. Grind the vanadium-titanium magnetite into powder by a grinder, then mix the carbon powder with the vanadium-titanium magnetite powder to form a mixed powder, add the mixed powder into the feeding device 5, and move the mixed powder in the heating tank 2 through the feeding device 5; the feeding motor drives the spiral feeding rod to rotate, thereby moving the powder to the right, and the left cover plate 21 and the right cover plate 22 can prevent the gas in the heating bin 3 from escaping from both sides of the heating bin;

[0052] S2. The mixed powder is heated by a microwave heating device 4. The carbon powder burns to generate carbon dioxide after reaching the ignition point. The carbon dioxide and carbon powder are not fully burned to form carbon monoxide gas. The carbon monoxide gas generates plasma in a microwave environment. The carbon plasma reacts with the vanadium-titanium magnetite powder at high temperature to generate iron, titanium particles and carbon dioxide gas. The iron and titanium particles are then separated by magnetic screening. The power transformer 44 provides power to the magnetron 42. The magnetron 42 generates microwaves that enter the heating chamber 3 through the magnetron channel 41. The microwaves act on the mixed powder to heat the mixed powder.

[0053] The heat dissipation fan 43, magnetron 42, power transformer 44, feed motor 52, rotary motor 451, exhaust fan 62, air compressor 66, control valve 1 68, control valve 2 691, regulating valve 73, and electronic igniter 74 used in the above embodiments are all commercially available products. As long as the functions of the present invention can be achieved, those skilled in the art can choose to use them according to common sense, and no special limitation is made here.

Claims

1. A microwave plasma device, characterized in that: The invention comprises a base (1), a heating tank (2) is fixedly connected to the top of the base (1), a heating chamber (3) is fixedly connected to the top of the base (1), a plurality of microwave heating devices (4) are fixedly connected to the top of the heating chamber (3), a material conveying device (5) is arranged inside the heating tank (2), and a gas supply system (6) is fixedly connected to the top of the heating chamber (3); The microwave heating device (4) comprises a magnetron channel (41), a magnetron (42) is fixedly connected to the upper right side of the magnetron channel (41), a heat dissipation fan (43) is provided on the right side of the magnetron (42), a power transformer (44) is fixedly connected to the lower side of the magnetron (42), and the power transformer (44) is electrically connected to the heat dissipation fan (43) and the magnetron (42).

2. A microwave plasma device according to claim 1, characterized in that: The feeding device (5) comprises a spiral feeding rod (51), a feeding motor (52) is fixedly connected to the left side of the heating tank (2), and the output shaft of the feeding motor (52) is drivingly connected to the spiral feeding rod (51), a feeding port (53) is provided below the right end of the heating tank (2), a feeding bin (54) is provided above the left end of the heating tank (2), the outer wall of the feeding bin (54) is supported by the ground through a supporting rod (541), and the bottom of the feeding bin (54) is communicated with the heating tank (2), a left cover plate (21) is fixedly connected to the upper left side of the heating tank (2), and the left and right ends of the left cover plate (21) are respectively fixedly connected to the outer wall of the feeding bin (54) and the heating bin (3), and a right cover plate (22) is fixedly connected to the upper right side of the heating tank (2), and the left end of the right cover plate (22) is fixedly connected to the outer wall of the heating bin (3).

3. A microwave plasma device according to claim 1, characterized in that: A rotary fan (45) is fixedly connected to each of the left and right sides of the top of the heating chamber (3); the rotary fan (45) comprises a rotating motor (451); the rotating motor (451) is fixed to the top of the heating chamber (3); the output shaft of the rotating motor (451) passes through the wall of the heating chamber (3) and is fixedly connected to a fan blade (452); the rotating motor (451) is electrically connected to the power transformer (44).

4. A microwave plasma device according to claim 1, characterized in that: The air supply system (6) comprises an air bin (61), the bottom of the air bin (61) is fixedly connected to the top of the heating bin (3), the bottom of the air bin (61) is fixedly connected to an exhaust fan (62), the air outlet of the exhaust fan (62) is connected to an air jet pipe (63), the lower end of the air jet pipe (63) is connected to the inside of the heating bin (3), return air channels (64) are provided on both sides of the heating bin (3), the top of the return air channel (64) is connected to a return air pipe (65), and the upper end of the return air pipe (65) is connected to the air bin (61).

5. A microwave plasma device according to claim 1, characterized in that: An air compressor (66) is fixedly connected to the right side of the air bin (61); an air inlet of the air compressor (66) is connected to the air bin (61); an air outlet of the air compressor (66) is connected to an air storage tank (67); a control valve 1 (68) is provided at the connection point; an air supply pipe (69) is connected to the front side of the air storage tank (67); a terminal end of the air supply pipe (69) is connected to the air injection pipe (63); a control valve 2 (691) is provided at the connection point.

6. A microwave plasma device according to claim 1, characterized in that: A preheating tank (7) is provided at the lower left side of the heating tank (2); an air equalization box (71) is provided at the bottom of the preheating tank (7); an overflow pipe (72) is communicated with the lower end of the air equalization box (71); a regulating valve (73) is provided at the connection between the overflow pipe (72) and the air equalization box (71); an electronic igniter (74) and a plurality of air jet heads (75) are fixedly connected to the top of the air equalization box (71); the air jet heads (75) are communicated with the interior of the air equalization box (71); and a plurality of exhaust holes (76) are provided on the side wall of the preheating tank (7).

7. A microwave plasma device according to claim 1, characterized in that: A preheating tank (7) is provided at the lower left side of the heating tank (2); an air equalization box (71) is provided at the bottom of the preheating tank (7); an overflow pipe (72) is connected to the lower end of the air equalization box (71); a regulating valve (73) is provided at the connection between the overflow pipe (72) and the air equalization box (71); an electronic igniter (74) and a plurality of air injection heads (75) communicated with the air equalization box (71) are fixedly connected to the top of the air equalization box (71); and a plurality of exhaust holes (76) are provided on the side wall of the preheating tank (7).

8. An application of a microwave plasma device, characterized in that: It is used in the smelting of vanadium-titanium magnetite.

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