Magnesium metal vacuum smelting furnace

Abstract

The utility model provides a magnesium metal vacuum smelting furnace which comprises a tank body and a tank cover, a crucible and a splash-proof cover are arranged in the tank body, and a liquid ferrosilicon heat preservation input mechanism, a residue siphon discharging mechanism and a residual iron discharging mechanism are arranged at the bottom of the tank body. The liquid silicon iron heat preservation input mechanism comprises a liquid silicon iron built-in channel which is arranged upwards from the bottom of the crucible and a silicon iron heat preservation conveying pipeline which is arranged at the bottom of the tank body; the residue siphon discharging mechanism comprises a residue discharging built-in channel arranged upwards from the bottom of the crucible and a residue siphon discharging pipeline arranged on the outer side of the bottom of the tank body, a transparent viewing opening is formed in the pipe wall of the residue siphon discharging pipeline, and a cover body is arranged at an end opening of the residue siphon discharging pipeline; and the residual iron discharging mechanism is connected with the bottom of the tank body. According to the utility model, a liquid ferrosilicon reducing agent can be ensured not to be solidified during input, residues after reduction reaction can be smoothly discharged, and reduced residual iron can be automatically discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metal smelting, more particularly to a magnesium vacuum smelting furnace. BACKGROUND

[0002] Magnesium is one of the lightest metal elements with the most abundant reserves on earth, with an abundance of 2% in the earth's crust. China is the country with the most abundant magnesium resources in the world, with a wide range of magnesium resource ore types. Solid mines mainly include magnesite, dolomite, serpentine, etc. Magnesium is a green metal material in the 21st century, which is applied in the form of magnesium alloy, has high specific strength, light weight, shock absorption, good cutting machinability and other advantages, and is widely used in metallurgy, aerospace, transportation, military industry, battery and other fields.

[0003] At present, the main method for magnesium smelting in China is the Pidgeon method, which uses external flame heating method, with a thermal efficiency of 10%-30%, and a single production capacity of 3.5t-6t / day. It has defects such as high energy consumption, high pollution and low yield. Some enterprises use vertical tank method, which uses internal resistance heating method, with a thermal efficiency of 65%-85%, and a single production capacity of 320-460kg tank / day. It has problems such as tank wall sticking and heating body sticking.

[0004] Liquid magnesium smelting by injection is a new magnesium smelting technology. The process is to heat under a certain vacuum degree and temperature to melt silicon iron into a liquid reduction pool, and the magnesium-containing raw material is sprayed into the reduction pool through argon, and a controllable reduction reaction occurs. The technology and equipment are relatively mature, the reaction speed is fast, it has potential for large-scale production, the thermal efficiency is high, the cost is low, it is environmentally friendly, and it is the main development direction of future magnesium smelting.

[0005] However, the existing magnesium smelting furnace has high energy consumption, low product purity, silicon iron reducing agent is easy to block the input pipeline, and the residue after reduction reaction cannot be discharged well, so the magnesium smelting cost is high and the efficiency is low. Utility model content

[0006] In view of the above problems, the purpose of the utility model is to provide a magnesium vacuum smelting furnace, which can ensure that the liquid silicon iron reducing agent will not be condensed when input, and the residue after reduction reaction can be smoothly discharged, and the residual iron can be automatically discharged.

[0007] The utility model provides a magnesium vacuum smelting furnace, which comprises a tank body and a tank cover buckled on the tank body, a crucible is arranged at the bottom of the tank body, a splash-proof cover is buckled on the crucible, a liquid silicon iron heat preservation input mechanism, a residue siphon discharge mechanism and a residual iron discharge mechanism are arranged at the bottom of the tank body, wherein,

[0008] The liquid ferrosilicon heat preservation input mechanism comprises a built-in liquid ferrosilicon channel arranged upward from the bottom of the crucible, which is connected with a ferrosilicon heat preservation conveying pipe arranged outside the bottom of the tank body.

[0009] The residue siphon discharge mechanism comprises a built-in residue discharge channel arranged upward from the bottom of the crucible, which is connected with a residue siphon discharge pipe arranged outside the bottom of the tank body, a transparent viewing port is arranged on the pipe wall of the residue siphon discharge pipe, and a cover is arranged at the end of the residue siphon discharge pipe.

[0010] The pipe wall of the ferrosilicon heat preservation conveying pipe comprises a heat-resistant stainless steel layer, a carbon felt layer and a graphite layer arranged in sequence from outside to inside, and a heating device is arranged outside the ferrosilicon heat preservation conveying pipe.

[0011] The residue siphon discharge pipe comprises a first vertical pipe and a second vertical pipe connected with the bottom of the tank body through flange bolts, a horizontal pipe is detachably connected between the lower ends of the first vertical pipe and the second vertical pipe, the first vertical pipe is longer than the second vertical pipe, a downward inclined inclined pipe is detachably connected to the upper end of the first vertical pipe, the transparent viewing port is arranged at the upper part of the first vertical pipe, and the cover is arranged at the end of the inclined pipe; the pipe wall of the residue siphon discharge pipe comprises a heat-resistant stainless steel layer, a carbon felt layer and a refractory brick layer arranged in sequence from outside to inside.

[0012] The tank body comprises a steel cylinder and a steel bottom arranged at the bottom of the steel cylinder, the steel cylinder comprises annular steel walls connected in sequence, and a reinforcing ring plate is arranged at the connection between adjacent annular steel walls in an up-down direction; a refractory brick layer and a carbon fiber felt layer are arranged in sequence from inside to outside on the inner side of the steel cylinder, and a brick layer is arranged on the steel bottom; a tank body flange is arranged at the upper end of the steel cylinder, and a tank cover flange matching the tank body flange is arranged at the tank cover.

[0013] A flange water cooling device and a safety explosion-proof device are arranged on the tank body, the flange water cooling device comprises a water gas pipe arranged around the lower side of the tank body flange, the water inlet end of the water gas pipe is connected with a water supply system, the water outlet end of the water gas pipe is connected with a vacuum water cooling box, the vacuum water cooling box is connected with an external water cooling box, and a pneumatic ball valve is arranged at the water inlet end of the water gas pipe; the safety explosion-proof device comprises two groups of vacuum pressure release valves arranged at the middle and lower parts of the tank body, an integrated temperature transmitter is arranged on the tank body, and a temperature measurement probe of the integrated temperature transmitter extends into the interior of the tank body.

[0014] An openable and closable inspection door is arranged at the lower end of the tank body.

[0015] A residual iron discharging mechanism is arranged at the bottom of the tank body, and the residual iron discharging mechanism comprises a residual iron discharging port arranged at the bottom of the crucible and connected with a sliding nozzle arranged at the bottom of the tank body.

[0016] The crucible is a graphite crucible, a heating mechanism is arranged outside the crucible, the heating mechanism comprises an induction coil surrounding the lower half of the crucible, carbon felt is arranged between the induction coil and the crucible, and the induction coil is connected with a power supply outside the tank body.

[0017] An observation window is arranged on the tank cover, the observation window comprises penetrating pipes penetrating through the crucible and the tank cover, glass is arranged at the upper end of the penetrating pipes, one of the observation windows is vertically arranged, and the other observation window is arranged at an angle of 30 degrees with the vertical direction; a magnesium vapor outlet pipe is arranged at the upper part of the tank body and forms an angle of 10 degrees with the horizontal plane, and the magnesium vapor outlet pipe is connected with a magnesium vapor outlet port on the crucible.

[0018] Three splash cover hoisting devices are uniformly arranged on the tank cover, the splash cover hoisting device comprises a chain guide sleeve vertically arranged on the tank cover, a guide sleeve flange is arranged at the outer periphery of the upper end of the chain guide sleeve, a ring plate is arranged at the inner periphery of the upper end of the chain guide sleeve, two connecting plates which are symmetrically arranged with respect to the center surface of the ring plate are arranged on the ring plate, and a first pin shaft is connected between the two connecting plates; three lugs are uniformly arranged on the splash cover, the lug comprises two ear plates arranged on the splash cover and a second pin shaft connected between the two ear plates, a link chain is connected between the first pin shaft and the second pin shaft, and the link chain is located in the chain guide sleeve; a cover cap is buckled on the upper part of the chain guide sleeve, and a cover cap flange of the cover cap is connected with the guide sleeve flange through bolts.

[0019] As can be seen from the above description, the metal magnesium vacuum smelting furnace comprises a liquid silicon-iron heat preservation input mechanism, so that the liquid silicon-iron reducing agent cannot be cooled and solidified, and can be smoothly input into the smelting furnace; a residual slag siphon discharging mechanism can automatically and smoothly discharge the residual slag floating on the liquid silicon-iron reducing agent when the liquid silicon-iron reducing agent reaches a certain liquid level, and the amount of residual slag can be observed through a transparent observation port on the residual slag siphon discharging mechanism, and the flow of the residual slag can be observed when the residual slag is discharged, so as to determine whether the residual slag is blocked; and a residual iron discharging mechanism can automatically discharge residual iron by opening the sliding nozzle when the furnace is stopped for maintenance. The structure can improve the magnesium smelting efficiency and reduce the smelting cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other purposes and results of the present application will be more apparent and easy to understand through the following description in combination with the accompanying drawings, and with a more comprehensive understanding of the present application. In the drawings:

[0021] Figure 1 It is a sectional view of the magnesium vacuum smelting furnace according to the embodiment of the utility model;

[0022] Figure 2 It is a structural schematic view of the residue siphon slagging pipeline according to the embodiment of the utility model;

[0023] Figure 3 It is a sectional view of the tank body according to the embodiment of the utility model;

[0024] Figure 4 It is a side sectional view of the tank body according to the embodiment of the utility model;

[0025] Figure 5 It is a sectional view of the tank cover according to the embodiment of the utility model;

[0026] Figure 6 It is a sectional view of the splash-proof cover according to the embodiment of the utility model;

[0027] Figure 7 It is a structural schematic view of the splash-proof cover hoisting device according to the embodiment of the utility model;

[0028] Wherein, 1-tank body, 11-steel cylinder, 12-reinforcing ring rib plate, 13-refractory brick layer, 14-carbon fiber felt layer, 15-magnesium carbon brick layer, 16-high alumina brick layer, 17-tank body flange plate, 18-magnesium vapor gas outlet pipe, 19-feeding opening;

[0029] 2-tank cover, 21-tank cover flange plate, 22-observation window, 23-powder gun mounting sleeve, 24-broken slag sampling gun mounting sleeve;

[0030] 3-crucible, 31-heating mechanism, 311-induction coil, 312-carbon felt;

[0031] 4-splash-proof cover, 41-splash-proof cover hoisting device, 411-chain guide sleeve, 412-guide sleeve flange, 413-ring plate, 414-connection plate, 415-first pin shaft, 416-lifting lug, 4161-ear plate, 4162-second pin shaft, 417-link chain, 418-sleeve cover, 419-sleeve cover flange, 42-powder gun guide sleeve, 43-broken slag sampling gun guide sleeve;

[0032] 5-liquid ferrosilicon heat preservation input mechanism, 51-liquid ferrosilicon built-in channel, 52-ferrosilicon heat preservation conveying pipeline, 53-heating device;

[0033] 6-residue siphon discharge mechanism, 61-residue discharge built-in channel, 62-residue siphon slagging pipeline, 621-first vertical pipe, 622-second vertical pipe, 623-cross pipe, 624-inclined pipe, 63-transparent viewing port, 64-cover body;

[0034] 7-flange water cooling device

[0035] 8-safety explosion-proof device, 81-vacuum pressure relief valve, 82-integrated temperature transmitter

[0036] 9-access door

[0037] 10-remnant iron discharge mechanism, 101-sliding nozzle

[0038] The same reference numbers in all the figures indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0039] The present application can be modified in various ways and can have various embodiments, and a specific embodiment is illustrated in the accompanying drawings and described. However, the present application is not limited to the specific embodiment, and all modifications, equivalents, and alternatives falling within the scope of the idea and technology of the present application are included, and it should be understood that they are included.

[0040] Numerical terms such as first, second, etc. can be used to describe various constituent elements, but the constituent elements are not limited to the terms. The terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the claims of the present application, a second constituent element can be named as a first constituent element, and similarly, a first constituent element can be named as a second constituent element. The term and / or a combination of a plurality of items or one item among a plurality of items which are associatedly described.

[0041] It should be understood that when referring to a constituent element "connected" or "contacted" with other constituent elements, this includes not only the case of being directly connected or contacted with other constituent elements, but also the case of being connected or contacted with other constituent elements with other constituent elements therebetween. Conversely, when referring to a constituent element "directly connected" or "directly contacted" with other constituent elements, it should be understood that there are no other constituent elements therebetween.

[0042] In the description of the embodiments, when it is described that a constituent element is "formed on or under" another constituent element, on or under includes both the case where the two constituent elements are directly contacted with each other or at least one of the other constituent elements is disposed between the two constituent elements. Also, when it is described as on or under, with a constituent element as a reference, it refers not only to the upper direction but also to the lower direction.

[0043] The terms used in the present application are used only for the purpose of illustrating specific embodiments and are not intended to limit the present application. Unless the context clearly indicates otherwise, the singular expression includes the plural expression. In the present application, it should be understood that the terms "include" or "have" or the like are used to designate the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification and do not preclude the presence or possibility of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0044] Unless otherwise defined, including technical or scientific terms, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms generally used in dictionaries should be interpreted in accordance with the meaning possessed in the context of the relevant technology, and if not explicitly defined in the present application, should not be interpreted as ideal or overly formal meanings.

[0045] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0046] As Figures 1-7 As shown, the metal magnesium vacuum smelting furnace proposed in the embodiment can be used for smelting metal magnesium and can also be used for smelting other metals.

[0047] In the liquid blowing method for smelting magnesium, a powder gun is used to spray calcined powder into the smelting furnace, the calcined powder reacts with the liquid ferrosilicon reducing agent to generate reaction residues and magnesium vapor, the magnesium vapor is collected, the residues float on the surface of the molten pool formed by the liquid ferrosilicon reducing agent, and the residues should be discharged in time when the amount of the residues reaches a certain amount, otherwise the smelting efficiency will be affected. If the liquid ferrosilicon reducing agent cannot be smoothly supplied, the smelting efficiency will also be affected. The metal magnesium vacuum smelting furnace can smoothly and timely discharge the residues and also can smoothly provide the liquid ferrosilicon.

[0048] The metal magnesium vacuum smelting furnace comprises a tank body 1 and a tank cover 2 buckled on the tank body 1, and the tank body 1 and the tank cover 2 are vacuumized by a vacuum pump to form a vacuum space and maintain a vacuum smelting environment.

[0049] A crucible 3 and a splash-proof cover 4 buckled on the crucible 3 are arranged at the bottom of the tank body 1. The crucible 3 and the splash-proof cover 4 form a vacuum reaction chamber, and the ferrosilicon reducing agent in the crucible 3 is kept liquid to form a molten pool by external heating, and then chemically reacts with the calcined powder. The splash-proof cover 4 is used to block the splashed residues and ferrosilicon in the reaction chamber and prevent them from splashing into the tank body 1, and also prevents the magnesium vapor generated by the reaction from diffusing.

[0050] In order to enable the liquid ferrosilicon to quickly and smoothly enter the crucible 3 without interruption, a liquid ferrosilicon heat preservation input mechanism 5 is arranged at the bottom of the tank body 1. The high-temperature liquid ferrosilicon transported by an external device can pass through the heat preservation input mechanism before entering the crucible 3, so as to prevent the liquid ferrosilicon from cooling and solidifying and blocking the input pipeline.

[0051] In order to transport the liquid ferrosilicon to the optimal position in the crucible 3 and improve the chemical reaction efficiency, the liquid ferrosilicon heat preservation input mechanism 5 can include a liquid ferrosilicon built-in channel 51 arranged upward from the bottom of the crucible 3, which penetrates the bottom of the tank body 1 and is connected with a ferrosilicon heat preservation conveying pipeline 52 arranged outside the bottom of the tank body 1.

[0052] The height of the liquid ferrosilicon built-in channel 51 is determined according to the smelting condition, and the wall surface of the liquid ferrosilicon built-in channel 51 can be refractory bricks and graphite from inside to outside. The liquid ferrosilicon built-in channel 51 is in communication with the bottom of the crucible 3 and the bottom of the tank body 1, so as to be connected with the ferrosilicon heat preservation conveying pipeline 52 outside the tank body 1. The ferrosilicon heat preservation conveying pipeline 52 is connected with external liquid ferrosilicon storage equipment and the like to obtain liquid ferrosilicon. The ferrosilicon heat preservation conveying pipeline 52 has the function of heat preservation, preventing the liquid ferrosilicon from being cooled and solidified during conveying.

[0053] In order to smoothly discharge the residues, a residue siphon discharge mechanism 6 is arranged at the bottom of the tank body 1. When the residues need to be discharged due to excessive residues, the residue siphon discharge mechanism 6 is opened, and the residues are discharged outside the tank body 1.

[0054] The residue siphon discharge mechanism 6 can include a residue discharge built-in channel 61 arranged upward from the bottom of the crucible 3, which penetrates the bottom of the tank body 1 and is connected with a residue siphon discharge pipeline 62 arranged outside the bottom of the tank body 1. A transparent viewing port 63 is arranged on the pipe wall of the residue siphon discharge pipeline 62, and a cover body 64 is arranged at the port of the residue siphon discharge pipeline 62.

[0055] The material of the residue discharge built-in channel 61 can be refractory bricks and graphite from inside to outside. The residue discharge built-in channel 61 is in communication with the bottom of the crucible 3 and the bottom of the tank body 1, so as to be connected with the residue siphon discharge pipeline 62 outside the tank body 1. The residue siphon discharge pipeline 62 is connected with external residue collection equipment to collect the discharged residues.

[0056] The residue siphon discharge mechanism 6 discharges the residues by the principle of siphon. The height of the residue discharge built-in channel 61 is determined according to the smelting condition, which can be the same as that of the liquid ferrosilicon built-in channel 51.

[0057] When the residues need to be discharged, the vacuum of the smelting furnace is appropriately released, and the cover body 64 can be opened. The residues enter the higher residue discharge built-in channel 61 under the action of gravity and are discharged through the lower residue siphon discharge pipeline 62.

[0058] The transparent viewing port 63 can facilitate the observation of whether the residues enter and the observation of the flow condition of the residues during the discharge of the residues. If the liquid residues do not flow, it indicates that the residues block the residue siphon discharge pipeline 62, which needs to be manually treated in time, and the residues can be smoothly discharged after the treatment.

[0059] The residual iron discharge mechanism is arranged at the bottom of the tank body, and can automatically discharge residual iron during shutdown and maintenance.

[0060] In one embodiment of the present application, in order to keep the liquid state of the input ferrosilicon, the pipe wall of the ferrosilicon heat preservation conveying pipeline 52 comprises a heat-resistant stainless steel layer, a carbon felt layer and a graphite layer arranged in sequence from outside to inside, and a heating device 53 is arranged outside the ferrosilicon heat preservation conveying pipeline 52 for heating. The connection between the ferrosilicon heat preservation conveying pipeline 52 and the tank body 1 is sealed to prevent air from entering.

[0061] The graphite layer is in contact with the liquid ferrosilicon, and the graphite layer and the carbon felt layer play a heat preservation role, the heat-resistant stainless steel layer is in contact with the heating device 53, and the heating device 53 can further ensure the temperature of the liquid ferrosilicon to prevent solidification.

[0062] In one embodiment of the present application, in order to facilitate the discharge of the residue, the residue siphon slag discharge pipeline 62 comprises a first vertical pipe 621 and a second vertical pipe 622 connected to the bottom of the tank body 1 through flange bolts, a horizontal pipe 623 is detachably connected between the lower ends of the first vertical pipe 621 and the second vertical pipe 622, the first vertical pipe 621 is longer than the second vertical pipe 622, a downward inclined inclined pipe 624 is detachably connected to the upper end of the first vertical pipe 621, a transparent viewing port 63 is arranged at the upper portion of the first vertical pipe 621, and a cover body 64 is arranged at the end portion of the inclined pipe 624.

[0063] With the smelting process, when the residue in the crucible 3 reaches a certain height, it will enter the residue discharge built-in channel 61 by its own gravity, thereby entering the residue siphon slag discharge pipeline 62, if the residue can be seen in the transparent viewing port 63, it indicates that there is a lot of residue and the residue needs to be discharged, the cover body 64 is opened, the first vertical pipe 621 is much lower than the residue discharge built-in channel 61, and the siphon effect is caused to suck out the residue and enter the residue collection equipment. When the cover body 64 is opened, the vacuum needs to be appropriately released, so that the cover body 64 can be opened, and in the residue discharge process, the residue siphon slag discharge pipeline 62 is full of residue, and the vacuum degree in the crucible 3 will not be affected.

[0064] If the residue flows very slowly or not at all in the transparent viewing port 63 during the residue discharge process, it indicates that there is residue sticking to the pipe wall of the residue siphon slag discharge pipeline 62, which hinders the discharge of the residue. The first vertical pipe 621, the horizontal pipe 623, the second vertical pipe 622 and the inclined pipe 624 are all detachably connected, which can facilitate the disassembly and removal of the residue sticking and the remaining residue, so as to prevent the residue sticking from blocking the pipeline. The residue siphon slag discharge pipeline 62 should be cleaned after each smelting process.

[0065] The pipe wall of the residue siphon slag outlet pipe 62 comprises, from outside to inside, heat-resistant stainless steel, carbon felt and firebrick. The pipe wall formed by the firebrick, carbon felt and heat-resistant stainless steel can withstand the high temperature of the residue and insulate the high temperature of the residue from the outside.

[0066] In one embodiment of the present application, the tank body 1 can comprise a steel cylinder 11 and a steel bottom arranged at the bottom of the steel cylinder 11, and the material can be Q355 steel. The steel cylinder 11 comprises annular steel walls connected in sequence, which can be four in the present embodiment. A reinforcing ring rib plate 12 is arranged on the connecting portion of adjacent annular steel walls. A carbon fiber felt layer 14 and a firebrick layer 13 are arranged in sequence on the inner wall of the steel cylinder 11 from outside to inside. A magnesite-carbon brick layer 15 and a high-alumina brick layer 16 are arranged in sequence on the steel bottom from bottom to top. A tank body flange plate 17 is arranged at the upper end of the steel cylinder 11. A tank cover flange plate 21 adapted to the tank body flange plate 17 is arranged at the tank cover 2.

[0067] The tank cover 2 is buckled on the tank body 1. The tank body flange plate 17 and the tank cover flange plate 21 are tightly attached together by vacuum extraction. After breaking the vacuum, the tank body 1 can be directly hoisted and transported away.

[0068] The tank body 1 is a tall cylinder. The reinforcing ring rib plate 12 can reinforce the combination of the annular steel wall and the internal carbon fiber felt layer 14 and firebrick layer 13, so that the structure is firm.

[0069] The outer wall of the tank body 1 is made of steel, which can ensure the vacuum degree. The internal firebrick layer 13 can withstand the high temperature of thousands of degrees in smelting. The carbon fiber felt layer 14 has the characteristics of heat resistance, acid resistance and alkali resistance, and can keep warm and insulate the high temperature in the furnace from the outside. The high-alumina brick layer 16 at the bottom has high thermal stability and a fire resistance of more than 1770 DEG C, and has good slag resistance, so it is suitable for being used as the lining of the tank body 1. The light magnesite-carbon brick layer 15 has good heat insulation and heat shock resistance. The tank bottom formed by the two layers of bricks has good stability.

[0070] In one embodiment of the present application, in order to ensure safe smelting, a flange water cooling device 7 and a safety explosion-proof device 8 are arranged on the tank body 1. The flange water cooling device 7 comprises a water gas pipe arranged at the lower side of the tank body flange plate 17. The water inlet end of the water gas pipe is connected with a water supply system. The water outlet end of the water gas pipe is connected with a vacuum water cooling tank. The vacuum water cooling tank is connected with an external water cooling collection tank. A pneumatic ball valve is arranged at the water inlet end of the water gas pipe.

[0071] The water gas pipe is a high-temperature resistant water pipe. After cold water is introduced into the water gas pipe, the tank body flange plate 17 can be cooled, so that the tank cover flange plate 21 is cooled. The water flowing out of the water gas pipe is high-temperature water heated by the high temperature of the tank body flange plate 17. The high-temperature water first flows into the vacuum water cooling tank to reduce the water temperature, and then flows into the external water cooling collection tank to further reduce the water temperature. The pneumatic ball valve can control the opening and closing of the water inlet end of the water gas pipe.

[0072] The safety explosion-proof device 8 can include two groups of vacuum pressure release valves 81 arranged at the middle and lower part of the tank body 1, and when the temperature and vacuum degree are abnormal, the vacuum pressure release valves 81 can release appropriate vacuum to protect safety.

[0073] In order to know the temperature in the tank body 1 in real time, an integrated temperature transmitter 82 can be arranged on the tank body 1, and a temperature measuring probe of the integrated temperature transmitter 82 extends into the inside of the tank body 1. A display instrument connected with the integrated temperature transmitter 82 can externally observe the temperature in the tank body 1.

[0074] In one embodiment of the utility model, in order to maintain and repair the equipment in the tank body 1 after shutdown, a removable manhole 9 is arranged at the lower end of the tank body 1. After the manhole 9 is closed, it should be sealed with the tank body 1 wall.

[0075] In one embodiment of the utility model, in order to discharge residual iron liquid in the crucible 3 after smelting, a residual iron discharge mechanism 10 is arranged at the bottom of the tank body 1, the residual iron discharge mechanism 10 includes a residual iron discharge port arranged at the bottom of the crucible 3, and the residual iron discharge port is connected with a sliding nozzle 101 arranged at the bottom of the tank body 1.

[0076] After the smelting is completed, the sliding nozzle 101 can accurately adjust the flow of residual iron flowing out of the crucible 3, and the residual iron discharge is stable and safe.

[0077] In one embodiment of the utility model, the crucible 3 is a graphite crucible, a heating mechanism 31 is arranged outside the crucible 3, the heating mechanism 31 includes an induction coil 311 surrounding the lower half of the crucible 3, carbon felt 312 is arranged between the induction coil 311 and the crucible 3, and the induction coil 311 is connected with a power supply outside the tank body 1.

[0078] After the induction coil 311 is powered on, the reactant in the crucible 3 can be heated to a set temperature, the 50mm-thick carbon felt 312 separates the induction coil 311 and the crucible 3, so that the induction coil 311 is prevented from being damaged due to overheating.

[0079] In one embodiment of the utility model, in order to observe the molten slag and molten pool in the crucible 3, an observation window 22 is arranged on the tank cover 2, the observation window 22 includes a penetrating pipe penetrating through the crucible 3 and the tank cover 2, glass is arranged at the upper end of the penetrating pipe, one observation window 22 is vertically arranged, and the other observation window 22 is arranged at an angle of 30° with the vertical direction.

[0080] The situation in the crucible 3 can be observed through the observation window 22, one observation window 22 can be vertically arranged near the center point of the tank cover 2, the other observation window 22 can be arranged between the other observation window 22 and the edge of the tank cover 2 and faces the center of the crucible 3. The two observation windows 22 can comprehensively observe the situation in the crucible 3.

[0081] To facilitate the collection of magnesium vapor, a magnesium vapor outlet pipe 18 with an angle of 10° to the horizontal plane is installed at the upper part of the tank 1. The magnesium vapor outlet pipe 18 is connected to the magnesium vapor outlet on the crucible 3. The slightly upward-sloping magnesium vapor outlet pipe 18 is connected to a vacuum magnesium collection device to collect the smelted magnesium vapor.

[0082] The upper part of the tank body 1 is also provided with a feeding port 19, which is connected to the feed port on the crucible 3. The feeding port 19 receives the material from the vacuum chamber, and the material can be used to supplement ferrosilicon.

[0083] The can lid 2 is also equipped with a powder spraying gun mounting sleeve 23 and a slag breaking and sampling gun mounting sleeve 24, which are used to install and guide the powder spraying gun and the slag breaking and sampling gun.

[0084] A powder spraying gun guide sleeve 42 and a slag-breaking sampling gun guide sleeve 43 are installed on the splash cover 4. The lower end of the powder spraying gun mounting sleeve 23 is located between the tank cover 2 and the splash cover 4 and is connected to the powder spraying gun guide sleeve 42. The lower end of the slag-breaking sampling gun mounting sleeve 24 is located between the tank cover 2 and the splash cover and is connected to the slag-breaking sampling gun guide sleeve 43. Corrugated pipes are installed on the portions of the powder spraying gun mounting sleeve 23 and the slag-breaking sampling gun mounting sleeve 24 located below the tank cover 2 to mitigate thermal displacement under high-temperature conditions.

[0085] In a specific embodiment of this utility model, in order to connect the can lid 2 and the splash guard 4, three splash guard lifting devices 41 are evenly arranged around the can lid 2. The three splash guard lifting devices 41 connect the can lid 2 and the splash guard 4, and the splash guard 4 can be lifted at the same time when the can lid 2 is lifted.

[0086] The splash cover hoisting device 41 includes a chain guide sleeve 411 vertically mounted on the can cover 2. The chain guide sleeve 411 communicates with the interior of the can cover 2. A guide sleeve flange 412 is provided on the outer periphery of the upper end of the chain guide sleeve 411. A ring plate 413 is provided on the inner periphery of the upper end of the chain guide sleeve 411. Two connecting plates 414 are provided on the ring plate 413 symmetrical about the center face of the ring plate 413. A first pin 415 is connected between the two connecting plates 414. The first pin 415 passes through the holes on the two connecting plates 414 and is fixed by a cotter pin.

[0087] The ring plate 413 and the guide sleeve flange 412 can be an integral ring flange plate.

[0088] Three lifting lugs 416 are evenly arranged around the perimeter of the splash cover 4, with the three lugs 416 corresponding to three chain guide sleeves 411, one above the other. Each lifting lug 416 may include two ear plates 4161 and a second pin 4162 connecting the two ear plates 4161. The second pin 4162 passes through holes in the two ear plates 4161 and is fixed by a cotter pin. The cotter pin fixing facilitates disassembly from the splash cover 4.

[0089] The first pin shaft 415 and the second pin shaft 4162 are respectively used as the connecting points on the tank cover 2 and the splash cover 4, and the link chain 417 is connected between the first pin shaft 415 and the second pin shaft 4162 and passes through the chain guide sleeve 411. The link chain 417 is a loop formed by the chain.

[0090] In order to ensure the vacuum in the tank body 1, a cover 418 is buckled on the upper part of the chain guide sleeve 411 during the smelting process, and the cover flange 419 of the cover 418 is connected with the guide sleeve flange 412 through bolts. The cover 418 is a cover body 64 with the same cross section as the chain guide sleeve 411, and the cover flange 419 matched with the guide sleeve flange 412 is arranged on the edge of the cover body 64. After the cover 418 is installed on the chain guide sleeve 411, the chain guide sleeve 411 can be closed.

[0091] An internal guide sleeve can also be arranged inside the chain guide sleeve 411, the upper end of the internal guide sleeve is connected with the inner ring of the ring plate 413, and the lower end penetrates the tank cover 2. The upper half of the link chain 417 is limited in the internal guide sleeve, and the link chain 417 is basically vertical when the tank cover 2 is lifted, so that the splash cover 4 can be lifted stably without shaking.

[0092] The splash cover 4 can include the cover body 64 made of stainless steel 2520 and the heat-resistant concrete cover lining from top to bottom.

[0093] The metal magnesium vacuum smelting furnace improves the stability, safety and product purity of the liquid magnesium smelting by spraying, and improves the smelting efficiency.

[0094] The metal magnesium vacuum smelting furnace according to the present application is described above with reference to the accompanying drawings in an exemplary manner. However, those skilled in the art should understand that various improvements can be made to the metal magnesium vacuum smelting furnace according to the present application without departing from the content of the present application. Therefore, the protection scope of the present application should be determined by the content of the appended claims.

Claims

1. A vacuum smelting furnace for magnesium metal, comprising a vessel body and a lid fastened to the vessel body, a crucible disposed at the bottom of the vessel body and a splash guard fastened to the crucible, characterized in that, The bottom of the tank is equipped with a liquid ferrosilicon insulation input mechanism, a residue siphon discharge mechanism, and a residual iron discharge mechanism, wherein... The liquid ferrosilicon insulation input mechanism includes a liquid ferrosilicon built-in channel that extends upward from the bottom of the crucible. The liquid ferrosilicon built-in channel passes through the bottom of the tank and is connected to a ferrosilicon insulation conveying pipe located on the outside of the bottom of the tank. The residue siphon discharge mechanism includes a built-in residue discharge channel extending upward from the bottom of the crucible. The built-in residue discharge channel passes through the bottom of the tank and connects to a residue siphon discharge pipe located on the outside of the bottom of the tank. A transparent viewing port is provided on the pipe wall of the residue siphon discharge pipe, and a cover is provided at the port of the residue siphon discharge pipe.

2. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, The pipe wall of the ferrosilicon insulated conveying pipe includes a heat-resistant stainless steel layer, a carbon felt layer and a graphite layer arranged sequentially from the outside to the inside, and a heating device is provided on the outside of the ferrosilicon insulated conveying pipe.

3. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, The residue siphon discharge pipe includes a first vertical pipe and a second vertical pipe connected to the bottom of the tank by flange bolts. A horizontal pipe is detachably connected between the lower ends of the first vertical pipe and the second vertical pipe. The first vertical pipe is longer than the second vertical pipe. A downwardly inclined pipe is detachably connected to the upper end of the first vertical pipe. The transparent viewing port is located at the upper part of the first vertical pipe. The cover is located at the end of the inclined pipe. The pipe wall of the residue siphon discharge pipe includes a heat-resistant stainless steel layer, a carbon felt layer, and a refractory brick layer arranged sequentially from the outside to the inside.

4. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, The tank body includes a steel cylinder and a steel bottom disposed at the bottom of the steel cylinder. The steel cylinder includes annular steel walls connected in sequence, and a reinforcing ring rib is provided above and below the connection of adjacent annular steel walls. A refractory brick layer and a carbon fiber felt layer are laid sequentially from the inside to the outside on the inner side of the steel cylinder, and a brick layer is laid on the bottom of the steel cylinder. A tank body flange is provided around the upper end of the steel cylinder, and a tank cover flange that is compatible with the tank body flange is provided around the tank cover.

5. The vacuum smelting furnace for metallic magnesium as described in claim 4, characterized in that, The tank is equipped with a flange water cooling device and a safety explosion-proof device. The flange water cooling device includes a water gas pipe arranged around the lower side of the flange of the tank. The water inlet of the water gas pipe is connected to the water supply system, and the water outlet of the water gas pipe is connected to the vacuum water cooling box. The vacuum water cooling box is connected to an external water cooling box. A pneumatic ball valve is provided at the water inlet of the water gas pipe. The safety and explosion-proof device includes two sets of vacuum pressure relief valves located in the lower middle part of the tank body, and an integrated temperature transmitter is installed on the tank body, with the temperature probe of the integrated temperature transmitter extending into the interior of the tank body.

6. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, An openable and closable inspection door is provided at the lower end of the tank.

7. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, The residual iron discharge mechanism includes a residual iron discharge outlet at the bottom of the crucible, which is connected to a sliding sprue at the bottom of the tank.

8. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, The crucible is a graphite crucible, and a heating mechanism is provided on the outside of the crucible. The heating mechanism includes an induction coil surrounding the lower half of the crucible, and a carbon felt is laid between the induction coil and the crucible. The induction coil is connected to a power source outside the container.

9. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, An observation window is provided on the lid of the container. The observation window includes a tube that passes through both the crucible and the lid of the container. A glass is provided at the upper end of the tube. One observation window is vertically positioned, and the other observation window makes an angle of 30° with the vertical direction. A magnesium vapor outlet pipe with an angle of 10° to the horizontal plane is provided on the upper part of the tank body, and the magnesium vapor outlet pipe is connected to the magnesium vapor outlet on the crucible.

10. The vacuum smelting furnace for metallic magnesium as described in claim 1, characterized in that, Three splash cover lifting devices are evenly arranged around the can lid. Each splash cover lifting device includes a chain guide sleeve vertically arranged on the can lid. A guide sleeve flange is provided on the outer circumference of the upper end of the chain guide sleeve. A ring plate is provided on the inner circumference of the upper end of the chain guide sleeve. Two connecting plates are provided on the ring plate with respect to the center face of the ring plate. A first pin is connected between the two connecting plates. Three lifting lugs are evenly arranged around the splash cover. Each lifting lug includes two ear plates disposed on the splash cover and a second pin connecting the two ear plates. A chain is connected between the first pin and the second pin, and the chain is located in the chain guide sleeve. A cover is fastened to the upper part of the chain guide sleeve, and the cover flange is connected to the guide sleeve flange by bolts.

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