Radio frequency linear plasma device and application thereof in vanadium titano-magnetite smelting

Abstract

The invention discloses a radio frequency linear plasma device and application thereof in vanadium titano-magnetite smelting. The device comprises an outer shell, a discharge chamber arranged in the outer shell, a neutralizer arranged at the top end of the outer shell, a radio frequency induction coil and a heat exchange coil, wherein the radio frequency induction coil and the heat exchange coil are arranged in the outer shell; an air inlet joint and an air outlet joint are arranged on the outer shell; the bottom end of the discharge chamber is communicated with the air inlet connector, the top end of the discharge chamber is provided with a high-temperature-resistant pipe clamped with the air outlet connector, the neutralizer is communicated with the air outlet connector, the radio frequency induction coil is sleeved outside the discharge chamber, and the outer shell is provided with a radio frequency input connector connected with the radio frequency induction coil; the device is reasonable in structural design, the annular radio frequency induction coil is adopted to replace a traditional induction electrode, high-density plasma can be generated under the lower radio frequency voltage, the operation energy consumption of the device is greatly reduced, meanwhile, the formed annular plasma can promote efficient smelting of the vanadium titano-magnetite, and the service life of the vanadium titano-magnetite is prolonged. And the content of titanium dioxide in a smelted product is remarkably increased, so that the method has good market competitiveness.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting, and in particular to a radio frequency linear plasma device and application thereof in smelting vanadium-titanium magnetite. 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 for smelting. It can quickly decompose impurities in ores at extremely high temperatures, effectively improving the purity of metals; and has the advantages of lower energy consumption, higher reaction efficiency and less environmental impact. However, existing plasma smelting equipment cannot fundamentally improve the drawbacks caused by thermodynamic and kinetic limitations, resulting in high energy consumption and low product purity.

[0005] Faced with the above problems, some researchers have proposed combining radio frequency technology with plasma smelting technology. However, existing radio frequency linear plasma smelting devices all use electrodes to generate arcs. When the electrode material is lost, it will combine with the molten metal to form an alloy, making it difficult to obtain high-purity metal products. At the same time, the loss of electrode material will directly affect the service life of the device.

[0006] Therefore, the present invention aims to design an electrode-free, low-energy-consumption radio frequency linear plasma device and its application in vanadium-titanium magnetite smelting. Summary of the invention

[0007] In view of the above-mentioned technical problems, the present invention provides a radio frequency linear plasma device and its application in the smelting of vanadium-titanium magnetite.

[0008] The technical solution of the present invention is: a radio frequency linear plasma device, comprising an outer shell, a discharge chamber movably arranged inside the outer shell, a neutralizer arranged at the top of the outer shell and connected to the discharge chamber, a radio frequency induction coil arranged inside the outer shell and sleeved outside the discharge chamber, and a heat exchange coil wound on the inner wall of the outer shell;

[0009] The outer shell includes an outer cylinder, a top cover movably connected to the upper end of the outer cylinder, and a bottom cover movably connected to the lower end of the outer cylinder; an air outlet joint is provided through the top cover; a limited countersunk hole is provided on the upper end surface of the lower end cover; a liquid inlet pipe and a liquid outlet pipe respectively connected to the two ports of the heat exchange coil are provided on the outer wall of the outer cylinder;

[0010] The top of the discharge chamber is provided with a high temperature resistant tube movably connected with the gas outlet joint, and the bottom of the discharge chamber is provided with a limit seat movably connected with the limit countersunk hole; the bottom surface of the bottom cover is provided with an air inlet joint connected with the discharge chamber;

[0011] The neutralizer is connected to the gas outlet joint, and a gas outlet nozzle is arranged on the neutralizer;

[0012] The radio frequency induction coil is arranged on the upper end surface of the bottom cover through a positioning sleeve, and a conductive seat is arranged on the inner side wall of the outer tube, which is slidably engaged with the two terminal ends of the radio frequency induction coil; a radio frequency input connector is arranged on the outer side wall of the outer tube; a conductive top rod that penetrates the outer tube and abuts against the conductive seat is movably engaged inside the radio frequency input connector; a damping spring that is grounded to the inner wall of the radio frequency input connector is sleeved on the side of the conductive top rod away from the conductive seat.

[0013] Furthermore, an air intake flow regulating assembly is movably arranged inside the air intake joint; the air intake flow regulating assembly comprises a plurality of air intake baffles equidistantly distributed inside the air intake joint, a driving sleeve slidably clamped on the air intake joint, and an adjusting screw rotatably clamped on the outer wall of the air intake joint and threadedly connected to the driving sleeve; both ends of each air intake baffle are provided with a pinion penetrating the air intake joint; a rack meshingly connected to each pinion is provided on the lower bottom surface of the driving sleeve; a threaded seat penetrating the air intake joint and threadedly connected to the adjusting screw is provided on the lower side wall of the driving sleeve;

[0014] Description: The drive sleeve is driven to move inside the air inlet joint by adjusting the screw rod, and the corresponding air inlet baffle is turned inside the air inlet joint by utilizing the meshing action of the rack and the pinion gear, so as to adjust the flow rate of the working gas entering the air inlet joint, so that the present invention can generate different types of jet plasma according to production needs.

[0015] Furthermore, a sealing sleeve movably connected to the high temperature resistant tube is slidably connected to the lower end of the outlet joint, and the sealing sleeve is movably connected to the inner wall of the outlet joint through a plug-in rod, and a first damping spring is sleeved on the plug-in rod;

[0016] Description: When the high temperature resistant tube is connected to the air outlet joint, the sealing sleeve is pressed tightly against the top of the high temperature resistant tube under the action of the first damping spring, thereby ensuring the connection stability and sealing between the high temperature resistant tube and the air outlet joint.

[0017] Furthermore, a mounting groove is provided on the upper end surface of the top cover; the neutralizer is movably engaged in the mounting groove through the mounting sleeve; a plurality of fastening blocks are equidistantly distributed on the outer wall of the mounting sleeve and are respectively movably engaged with the top cover; fastening push rods are provided inside the top cover and at positions corresponding to the positions of the fastening blocks; the fastening push rods can be movably engaged with the fastening blocks one by one, and the ends of the fastening push rods that are away from each other are provided with second damping springs that abut against the inner wall of the top cover;

[0018] Note: The neutralizer is inserted into the mounting groove through the mounting sleeve. At this time, each fastening push rod is close to the corresponding fastening block under the action of the second damping spring, and is fixed with the corresponding fastening block one by one, thereby improving the installation convenience between the neutralizer and the top cover.

[0019] Furthermore, each fastening top rod is provided with a release rod penetrating the top cover and slidably engaged with the top cover; the upper end surface of the top cover is rotatably engaged with a release disk sleeved on the outside of the neutralizer; the lower bottom surface of the release disk is provided with arc-shaped guide grooves corresponding to and slidably engaged with each release rod;

[0020] Note: When the neutralizer needs to be disassembled, rotate the release plate so that each fastening push rod moves away from each other under the action of the arc guide groove and disengages from the corresponding fastening block.

[0021] Furthermore, a pressure plate abutting against the upper end surface of the radio frequency induction coil is slidably clamped inside the positioning sleeve; an extrusion screw penetrating the positioning sleeve and abutting against the upper end surface of the pressure plate is threadedly connected on the top cover; an insulating sleeve is provided on the bottom surface of the top cover and is sleeved on the outside of the high temperature resistant tube;

[0022] Description: The extrusion screw is used to push the pressure plate to move inside the positioning sleeve. The extrusion effect of the pressure plate makes the layers of the RF induction coil close to each other, which is convenient for adjusting the effective number of turns of the RF induction coil and realizing the adjustment of the induction strength of the RF induction coil.

[0023] Furthermore, a connecting seat is provided on the outer side wall of the outer cylinder;

[0024] Description: The connecting seat is used to connect and fix the device to the smelting furnace, which improves the stability and safety of the device.

[0025] The present invention also provides an application of a radio frequency linear plasma device. Based on the above radio frequency linear plasma device, it is applied to the smelting of vanadium-titanium magnetite.

[0026] The working principle of the present invention is:

[0027] When in use, the device is connected to a vanadium-titanium magnetite smelting furnace, an external RF power supply is connected to a RF input connector, an air inlet connector is connected to an external working gas supply device, and a liquid inlet pipe is connected to an external coolant supply device. The coolant flows through the heat exchange coil and is discharged and collected through a liquid outlet pipe. The alternating RF current generated by the external RF power supply flows to the conductive seat through the conductive top rod inside the RF input connector and is finally transmitted to the RF induction coil. According to Faraday's law of electromagnetic induction, when an alternating RF current is passed through the RF induction coil, the RF induction An alternating magnetic field is generated inside the coil and outside the discharge chamber. At the same time, the alternating magnetic field induces an alternating electric field. When the working gas flows through the discharge chamber, the alternating electric field triggers the working gas to discharge and generate high-energy plasma. When the high-energy plasma passes through the neutralizer, the static charge is eliminated, and the high-energy plasma is used to bombard the vanadium-titanium magnetite with high-energy electrons to melt it, and then carry out subsequent smelting treatment. When the coolant flows through the heat exchange coil, the heat inside the outer shell is taken out. The working gas is one of Ar, N2, O2, NH3, and NO.

[0028] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0029] First, the device structure of the present invention is reasonably designed, and has the advantages of low discharge gas pressure, high plasma density and good uniformity. Since a discharge chamber made of high-temperature resistant material is arranged inside the outer shell, direct contact between high-energy plasma and the inner wall of the outer shell is avoided, the convection and conduction losses of energy are reduced, and the energy utilization rate is improved;

[0030] Second, the present invention adopts an annular radio frequency induction coil to replace the traditional induction electrode. The radio frequency induction coil can generate high-density plasma at a lower radio frequency voltage, avoiding electrode contamination during the smelting process of vanadium-titanium magnetite. At the same time, the formed annular plasma can promote the efficient smelting of vanadium-titanium magnetite, thereby significantly increasing the content of titanium dioxide in the smelting product, and thus has good market competitiveness;

[0031] Third, by introducing cooling liquid into the heat exchange coil, the present invention can discharge the heat inside the outer shell in time, thereby ensuring the safe and stable operation of the device; at the same time, by arranging an air intake flow regulating component inside the air intake joint, the device of the present invention can flexibly adjust the flow of the working gas, so that the present invention can generate different types of jet plasma according to production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a longitudinal sectional view of the device of the present invention;

[0033] Figure 2 is a front view of the device of the present invention;

[0034] Figure 3 The present invention Figure 1 A local enlarged schematic diagram of the middle A;

[0035] Figure 4 It is a schematic diagram of the connection between the air intake flow regulating component and the air intake joint of the present invention;

[0036] Figure 5 is a distribution diagram of the air intake baffle of the present invention inside the air intake joint;

[0037] Figure 6 It is a schematic diagram of the connection between the release plate and the fastening ejector rod of the present invention;

[0038] Figure 7 The present invention Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0039] Figure 8 It is a schematic diagram of the connection between the radio frequency input connector and the radio frequency induction coil of the present invention;

[0040] Among them, 1-outer shell, 10-outer cylinder, 11-top cover, 110-installation groove, 12-bottom cover, 120-limiting countersunk hole, 13-air outlet joint, 130-sealing sleeve, 131-plug rod, 132-first damping spring, 14-shielding sleeve, 15-connecting seat, 2-discharge chamber, 20-high temperature resistant tube, 21-limiting seat, 22-inlet joint, 23-inlet flow adjustment component, 230-inlet baffle, 231-driving sleeve, 2310-threaded seat, 232-adjusting screw, 233-pinion gear, 23 4- rack, 3- neutralizer, 30- air outlet nozzle, 31- mounting sleeve, 310- fastening block, 32- fastening ejector rod, 320- second damping spring, 321- release rod, 33- release plate, 330- arc guide groove, 4- RF induction coil, 40- positioning sleeve, 41- conductive seat, 42- RF input connector, 420- conductive ejector rod, 421- damping spring, 43- pressure plate, 430- extrusion screw, 44- insulating sleeve, 5- heat exchange coil, 50- liquid inlet pipe, 51- liquid outlet pipe, 52- arc seat. DETAILED DESCRIPTION

[0041] Example 1

[0042] like Figure 1 The radio frequency linear plasma device shown comprises an outer shell 1, a discharge chamber 2 movably arranged inside the outer shell 1, a neutralizer 3 arranged at the top of the outer shell 1 and connected to the discharge chamber 2, a radio frequency induction coil 4 arranged inside the outer shell 1 and sleeved outside the discharge chamber 2, and a heat exchange coil 5 wound around the inner wall of the outer shell 1;

[0043] like Figure 1 , 2As shown, the outer shell 1 includes an outer cylinder 10, a top cover 11 movably connected to the upper end of the outer cylinder 10 by bolts, and a bottom cover 12 movably connected to the lower end of the outer cylinder 10; an air outlet joint 13 is provided through the top cover 11; a limited countersunk hole 120 is provided on the upper end surface of the lower end cover 12; a liquid inlet pipe 50 and a liquid outlet pipe 51 respectively connected to the two ports of the heat exchange coil 5 are provided on the outer side wall of the outer cylinder 10; the air outlet joint 13 is threadedly connected to the top cover 11;

[0044] like Figure 1 As shown, the top of the discharge chamber 2 is provided with a high temperature resistant tube 20 movably connected to the gas outlet joint 13, and the bottom of the discharge chamber 2 is provided with a limit seat 21 movably connected to the limit counterbore 120; the bottom surface of the bottom cover 12 is provided with an air inlet joint 22 connected to the discharge chamber 2; the discharge chamber 2 and the high temperature resistant tube 20 are both made of quartz glass;

[0045] like Figure 1 , 2 As shown, the neutralizer 3 is connected to the gas outlet connector 13, and a gas outlet nozzle 30 is provided on the neutralizer 3; the neutralizer 3 adopts the neutralizer in the prior art;

[0046] like Figure 1 , 2 As shown in Figure 8, the RF induction coil 4 is arranged on the upper end surface of the bottom cover 12 through a positioning sleeve 40, and the RF induction coil 4 is sleeved on the outside of the discharge chamber 2; a conductive seat 41 is provided on the inner wall of the outer tube 10 and is slidably engaged with the two terminal ends of the RF induction coil 4; a RF input connector 42 is provided on the outer wall of the outer tube 10; a conductive top rod 420 that penetrates the outer tube 10 and abuts against the conductive seat 41 is movably engaged inside the RF input connector 42; a damping spring 421 that is grounded to the inner wall of the RF input connector 42 is sleeved on the side of the conductive top rod 420 away from the conductive seat 41.

[0047] Example 2

[0048] The difference between this embodiment and embodiment 1 is that:

[0049] like Figure 4 , 5 As shown, an air intake flow regulating component 23 is movably arranged inside the air intake joint 22; the air intake flow regulating component 23 includes 7 air intake baffles 230 equidistantly distributed inside the air intake joint 22, a driving sleeve 231 slidably clamped on the air intake joint 22, and an adjusting screw 232 rotatably clamped on the outer wall of the air intake joint 22 and threadedly connected to the driving sleeve 231; both ends of each air intake baffle 230 are provided with a small gear 233 that passes through the air intake joint 22; the lower bottom surface of the driving sleeve 231 is provided with a rack 234 that meshes with each small gear 233; and a threaded seat 2310 that passes through the air intake joint 22 and threadedly connected to the adjusting screw 232 is provided on the lower side wall of the driving sleeve 231.

[0050] Example 3

[0051] The difference between this embodiment and embodiment 2 is that:

[0052] like Figure 3 As shown, a sealing sleeve 130 movably engaged with the high temperature resistant tube 20 is slidably engaged at the lower end of the outlet connector 13, and the sealing sleeve 130 is movably engaged with the inner wall of the outlet connector 13 via a plug rod 131, on which a first damping spring 132 is sleeved.

[0053] Example 4

[0054] The difference between this embodiment and embodiment 3 is that:

[0055] like Figure 3 , 6 As shown in , 7, a mounting groove 110 is provided on the upper end surface of the top cover 11; the neutralizer 3 is movably engaged in the mounting groove 110 through the mounting sleeve 31; three fastening blocks 310 movably engaged with the top cover 11 are equidistantly distributed on the outer wall of the mounting sleeve 31; fastening push rods 32 are provided inside the top cover 11 and at positions corresponding to the positions of each fastening block 310; each fastening push rod 32 can be movably engaged with each fastening block 310 in a one-to-one correspondence, and each fastening push rod 32 is provided with a second damping spring 320 abutting against the inner wall of the top cover 11 at one end away from each other; each fastening push rod 32 is provided with a release rod 321 that penetrates the top cover 11 and is slidably engaged with the top cover 11; a release disk 33 sleeved on the outside of the neutralizer 3 is rotatably engaged on the upper end surface of the top cover 11; the lower bottom surface of the release disk 33 is provided with an arc guide groove 330 slidably engaged with each release rod 321 in a one-to-one correspondence.

[0056] Example 5

[0057] The difference between this embodiment and embodiment 4 is that:

[0058] like Figure 1 As shown, a pressure plate 43 abutting against the upper end surface of the RF induction coil 4 is slidably engaged inside the positioning sleeve 40; an extrusion screw 430 penetrating through the positioning sleeve 40 and abutting against the upper end surface of the pressure plate 43 is threadedly connected on the top cover 11; an insulating sleeve 44 sleeved on the outside of the high temperature resistant tube 20 is provided on the bottom surface of the top cover 11;

[0059] Example 6

[0060] The same thing as Example 5 is that:

[0061] like Figure 1 , 2 As shown, a shielding sleeve 14 is sleeved on the outer side of the outer cylinder 10 ; a connecting seat 15 is arranged on the outer side wall of the outer cylinder 10 .

[0062] Example 7

[0063] The same thing as Example 6 is that:

[0064] like Figure 8 As shown, an arc-shaped holder 52 movably engaged with the heat exchange coil 5 is provided on the inner wall of the outer tube 10 .

[0065] Example 8

[0066] This embodiment records the application of a radio frequency linear plasma device, which is based on the radio frequency linear plasma device recorded in any one of Examples 1-7 and is applied to the smelting of vanadium-titanium magnetite.

Claims

1. A radio frequency linear plasma device, characterized in that: It comprises an outer shell (1), a discharge chamber (2) movably arranged inside the outer shell (1), a neutralizer (3) arranged at the top of the outer shell (1) and connected to the discharge chamber (2), a radio frequency induction coil (4) arranged inside the outer shell (1) and sleeved outside the discharge chamber (2), and a heat exchange coil (5) wound around the inner wall of the outer shell (1); The outer shell (1) comprises an outer cylinder (10), a top cover (11) movably connected to the upper end of the outer cylinder (10), and a bottom cover (12) movably connected to the lower end of the outer cylinder (10); an air outlet joint (13) is provided through the top cover (11); a limit countersunk hole (120) is provided on the upper end surface of the lower end cover (12); and a liquid inlet pipe (50) and a liquid outlet pipe (51) are provided on the outer side wall of the outer cylinder (10) and are respectively connected to two ports of the heat exchange coil (5); The top of the discharge chamber (2) is provided with a high temperature resistant tube (20) movably engaged with the gas outlet joint (13), and the bottom of the discharge chamber (2) is provided with a limit seat (21) movably engaged with the limit counterbore (120); the bottom surface of the bottom cover (12) is provided with an air inlet joint (22) communicating with the discharge chamber (2); The neutralizer (3) is in communication with the gas outlet connector (13), and a gas outlet nozzle (30) is provided on the neutralizer (3); The radio frequency induction coil (4) is arranged on the upper end surface of the bottom cover (12) through a positioning sleeve (40); a conductive seat (41) slidably engaged with two connection terminals of the radio frequency induction coil (4) is arranged on the inner side wall of the outer tube (10); a radio frequency input connector (42) is arranged on the outer side wall of the outer tube (10); a conductive top rod (420) penetrating the outer tube (10) and abutting against the conductive seat (41) is movably engaged inside the radio frequency input connector (42); a damping spring (421) connected to the inner wall of the radio frequency input connector (42) is sleeved on a side of the conductive top rod (420) away from the conductive seat (41).

2. The radio frequency linear plasma device according to claim 1, characterized in that: An air intake flow regulating component (23) is movably arranged inside the air intake joint (22); the air intake flow regulating component (23) comprises a plurality of air intake baffles (230) equidistantly distributed inside the air intake joint (22), a driving sleeve (231) slidably engaged with the air intake joint (22), and an adjusting screw (232) rotatably engaged with the outer wall of the air intake joint (22) and threadedly connected to the driving sleeve (231); both ends of each of the air intake baffles (230) are provided with a pinion (233) penetrating the air intake joint (22); a rack (234) meshingly connected to each of the pinions (233) is provided on the lower bottom surface of the driving sleeve (231); and a threaded seat (2310) penetrating the air intake joint (22) and threadedly connected to the adjusting screw (232) is provided on the lower side wall of the driving sleeve (231).

3. The radio frequency linear plasma device according to claim 1, characterized in that: A sealing sleeve (130) is slidably engaged with the lower end of the air outlet joint (13) and is movably engaged with the high temperature resistant tube (20). The sealing sleeve (130) is movably engaged with the inner wall of the air outlet joint (13) via an insert rod (131). A first damping spring (132) is sleeved on the insert rod (131).

4. The radio frequency linear plasma device according to claim 1, characterized in that: The upper end surface of the top cover (11) is provided with a mounting groove (110); the neutralizer (3) is movably engaged in the mounting groove (110) through a mounting sleeve (31); a plurality of fastening blocks (310) are equidistantly distributed on the outer wall of the mounting sleeve (31) and are respectively movably engaged with the top cover (11); fastening push rods (32) are arranged inside the top cover (11) and at positions corresponding to the positions of the fastening blocks (310); the fastening push rods (32) can be movably engaged with the fastening blocks (310) in a one-to-one correspondence, and the ends of the fastening push rods (32) that are away from each other are provided with second damping springs (320) that abut against the inner wall of the top cover (11).

5. The radio frequency linear plasma device according to claim 4, characterized in that: Each of the fastening top rods (32) is provided with a release rod (321) penetrating the top cover (11) and slidably engaged with the top cover (11); the upper end surface of the top cover (11) is rotatably engaged with a release disk (33) sleeved on the outside of the neutralizer (3); the lower bottom surface of the release disk (33) is provided with arc-shaped guide grooves (330) respectively corresponding to and slidably engaged with each of the release rods (321).

6. The radio frequency linear plasma device according to claim 1, characterized in that: A pressure plate (43) is slidably engaged inside the positioning sleeve (40) and abuts against the upper end surface of the radio frequency induction coil (4); an extrusion screw (430) is threadedly connected to the top cover (11) and passes through the positioning sleeve (40) and abuts against the upper end surface of the pressure plate (43); and an insulating sleeve (44) is provided on the bottom surface of the top cover (11) and is sleeved on the outside of the high temperature resistant tube (20).

7. The radio frequency linear plasma device according to claim 1, characterized in that: A connecting seat (15) is provided on the outer side wall of the outer cylinder (10).

8. Application of a radio frequency linear plasma device, characterized in that: It is applied to the smelting of vanadium-titanium magnetite.

9. The radio frequency linear plasma device according to claim 8, characterized in that: The outer cylinder (10) is provided with a connecting seat (15).

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