CN113667838A - Device for refining crude magnesium by continuous vacuum distillation and casting magnesium ingot by pulling and process flow thereof - Google Patents

Abstract

The invention belongs to the technical field of magnesium smelting, and particularly relates to a device for refining and casting magnesium ingots by continuous vacuum distillation and a process flow thereof, and the device for refining and casting magnesium ingots by vacuum distillation has high production efficiency and can be continuously carried out, and comprises the following components: heating furnace A, heating furnace B, distillation crucible, heat preservation crucible, feeding device and drawing and casting device, distillation crucible set up in the heating furnace A, heat preservation crucible set up in the heating furnace B, the inside of heat preservation crucible is separated for keeping warm a room and keeping warm two rooms by the baffle, feeding device includes: the vacuum casting device comprises a charging hopper and a discharging pipe, wherein the distillation crucible is communicated with a first heat-preservation chamber through a steam pipeline, a liquid outlet pipe is further arranged on the lower portion of the side wall of the second heat-preservation chamber, the outlet end of the liquid outlet pipe extends out of the heating furnace B and is connected with a casting device, the charging hopper and the distillation crucible are respectively communicated with a vacuum pipeline, and the second heat-preservation chamber is further connected with an argon gas inlet pipe.

Description

Device for refining crude magnesium by continuous vacuum distillation and casting magnesium ingot by pulling and process flow thereof

Technical Field

The invention belongs to the technical field of magnesium smelting, and particularly relates to a magnesium ingot continuous vacuum distillation and crude magnesium refining and drawing casting device and a process flow thereof.

Background

Magnesium metal has excellent physical properties and machining properties, is an important constituent element of light alloy, has the characteristics of low cost and durability, is widely applied to industries such as electric power, electronics and automobiles, is also an important national defense metal, is one of the most used metals on missiles and space rails, and is known as the most promising lightweight material and green metal engineering material in the 21 st century by people.

Magnesium vacuum distillation refining refers to a magnesium refining method for removing impurities in crude magnesium by distillation under the condition of lower than atmospheric pressure to produce refined magnesium, magnesium flux refining or magnesium sedimentation refining can only remove non-metallic impurities and a part of metallic impurity iron in magnesium, and magnesium vacuum distillation refining can remove most of impurities in crude magnesium to obtain magnesium with higher purity.

The existing magnesium vacuum distillation refining is generally carried out in a vacuum distillation furnace, and magnesium is gasified after being heated to a certain temperature. The liquid enters a condenser cooled by water, and crystals are condensed on the surface of the condenser facing to the bottom of the tank. After the refining is finished, taking out the crystallized magnesium in the condenser, melting the crystallized magnesium in a low vacuum or inert atmosphere, and casting the magnesium ingot. The distillation refining process is complex, can not be continuously carried out, and has extremely low production efficiency.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides the device for refining the crude magnesium by vacuum distillation and casting the magnesium ingot and the process flow thereof, which have high production efficiency and can be continuously carried out.

In order to solve the technical problems, the invention adopts the technical scheme that:

the continuous vacuum distillation crude magnesium refining and magnesium ingot casting device comprises: the device comprises a heating furnace A, a heating furnace B, a distillation crucible, a heat-preservation crucible, a feeding device and a casting device, wherein the distillation crucible is arranged in the heating furnace A, the heat-preservation crucible is arranged in the heating furnace B, the interior of the heat-preservation crucible is divided into a first heat-preservation chamber and a second heat-preservation chamber by a baffle, a communicating pipe is arranged on the baffle, and a liquid valve A is arranged in the communicating pipe;

the feeding device comprises: the lower end of the charging hopper is provided with a discharge port, a discharge valve is arranged at the discharge port, when the discharge valve is closed, the discharge valve can realize sealing, the upper end of the discharge pipe is connected with the discharge port, and the lower end of the discharge pipe is communicated with the distillation crucible;

distillation crucible pass through the steam conduit with one room of keeping warm is linked together, the lateral wall lower part of two rooms that keep warm still is provided with the drain pipe, the entry end of drain pipe is located two indoor liquid valve B that just are provided with that keep warm, the exit end of drain pipe stretches out and is connected with the casting device to heating furnace B outside, loading hopper and distillation crucible communicate respectively has the vacuum pipe, all is provided with the vacuum valve in the vacuum pipe and is connected with evacuation equipment, two rooms that keep warm still are connected with the argon gas intake pipe.

Further, the drawing and casting apparatus includes: solidify pipeline, cooling jacket and pull-out device, the entry end of solidifying the pipeline with the exit end of drain pipe is connected, the outside cover of solidifying the pipeline is equipped with cooling jacket, pull-out device is located the export of solidifying the pipeline is outside, pull-out device includes: the magnesium strip solidification device comprises a conveying roller way and a pressing wheel arranged above the conveying roller way, wherein the pressing wheel is matched with the conveying roller way and used for pulling out a solidified magnesium strip from a solidification pipeline.

Further, the drawing and casting device further comprises: the magnesium strip shearing machine comprises a shearing machine, a positioning baffle and a contact switch, wherein the shearing machine is positioned at the tail end of the conveying roller way, one side of the shearing machine, which is far away from the transmission roller way, is provided with the positioning baffle, the end face, facing the shearing machine, of the positioning baffle is provided with the contact switch, the conveying roller way drives a magnesium strip to penetrate through a shearing area of the shearing machine and move towards the contact switch, the contact switch controls the shearing machine to work, when the magnesium strip presses the contact switch, the shearing machine works to shear the magnesium strip, and a worker can adjust the distance between the positioning baffle and the shearing machine according to the actual condition in production, namely the length of the sheared magnesium strip.

Further, the vapor conduit includes: the steam pipeline A and the steam pipeline B are vertically arranged, the steam pipeline A is connected to the upper end of the distillation crucible, the upper end of the steam pipeline B is communicated with the upper end of the steam pipeline A, the lower end of the steam pipeline B penetrates into the first heat-preservation chamber, the lower port of the steam pipeline B is slightly higher than the inner wall of the lower end of the first heat-preservation chamber, a heater A is arranged in the steam pipeline A, a heater B is arranged in the steam pipeline B, the heating furnace B is positioned below the heating furnace A, namely, the height difference exists between the distillation crucible and the heat-preservation crucible, when magnesium steam enters the steam pipeline B, the magnesium steam is condensed into liquid, the liquid enters the heat-preservation crucible from the steam pipeline B, the heating temperature of the heater A is 720 ℃, the magnesium steam in the steam pipeline A cannot be pre-cooled and condensed, the heating temperature of the heater B is 560 ℃, so that the magnesium vapor in the vapor pipe B condenses into a liquid without becoming a solid.

Further, still be provided with the filter in the steam pipeline A, the filter includes multilayer filtering baffle, filtering baffle all is provided with a plurality of air vents, and in the in-process of distillation crude magnesium solution, can the steam of the miscellaneous material metal such as iron, copper, aluminium of escape in the crude magnesium solution, so gas that the distillation produced still has the steam of other metals except magnesium steam, and when the whole filter that passes through of steam, magnesium steam can pass through smoothly, and the miscellaneous material metal can contact to condense behind the filtering baffle, drops again to the distillation crucible in.

Furthermore, the upper end of loading hopper is provided with dog-house that can open and shut, the side intercommunication of loading hopper has vacuum pipeline, and when adding thick magnesium in toward the loading hopper, the dog-house is opened, and the feed inlet is closed after adding the completion, and realizes sealed after the dog-house is closed, can carry out the evacuation to the loading hopper.

Further, the charging hopper and the distillation crucible are provided with vacuum pressure gauges, and the distillation crucible and the heat-preservation crucible are provided with thermometers for monitoring the temperature in the crucibles; the charging hopper and the distillation crucible are also communicated with an argon gas inlet pipe, and argon gas protective gas can be filled into the charging hopper and the distillation crucible when needed.

Further, be provided with the electrical heating rod in the drain pipe, when the distance was far away when casting device and heating furnace B position, the drain pipe is connected with the solidification pipeline through the connecting pipe, the connecting pipe overcoat is equipped with the electric heating circle, for the convenience of the drain pipe with solidify the connection of pipeline, can set up the connecting pipe, through setting up electrical heating rod and electric heating circle, can prevent that the magnesium liquid in drain pipe, the connecting pipe from solidifying, guarantees that the magnesium liquid flows.

Furthermore, a conveyer belt is arranged below the shearing machine, and the sheared small magnesium strips can directly fall onto the conveyer belt and be conveyed to a storage place.

The technological process of the continuous vacuum distillation crude magnesium refining and magnesium ingot casting device comprises the following steps:

step 1, preparation work, starting a heating furnace B, wherein the heating temperature is 680 ℃, the liquid valve A and the liquid valve B are both in a closed state, magnesium liquid prepared in advance is injected into a heat preservation first chamber, and the magnesium liquid enters the steam pipeline B from the lower end of the steam pipeline B to form a liquid seal for the steam pipeline.

Step 2, vacuumizing, namely adding the crushed crude magnesium into a charging hopper, closing a feeding port, and closing a discharging valve; starting a vacuumizing device, vacuumizing the feeding hopper and the distillation crucible, wherein the vacuum degrees of the components are the same and the vacuum degree is 500 Pa; at this time, the magnesium liquid in the vapor pipe B rises to form a liquid column.

Step 3, performing distillation work, namely opening a discharge valve, adding a proper amount of crude magnesium into a distillation crucible, closing the discharge valve, and opening a heater A to the temperature of 720 ℃; starting a heater B at the temperature of 500-560 ℃; starting the heating furnace A to heat at the temperature of 700-730 ℃, melting the crude magnesium into crude magnesium liquid, and distilling.

And 4, when the magnesium liquid in the first heat-preservation chamber reaches a certain amount, opening the liquid valve A, allowing the magnesium liquid to enter the second heat-preservation chamber through the communicating pipe, and when the magnesium liquid in the second heat-preservation chamber reaches a certain amount, closing the liquid valve A.

Step 5, drawing and casting: and closing the liquid valve A, filling argon into the heat-preservation second chamber through an argon inlet pipe, opening the liquid valve B, enabling the magnesium liquid to flow out of the heat-preservation second chamber through a liquid outlet pipe and enter a solidification pipeline, solidifying the magnesium liquid into magnesium strips in the solidification pipeline, pulling out the magnesium strips through a pulling-out device, and shearing the magnesium strips into small magnesium strips through a shearing machine.

During the casting work, magnesium liquid enters the solidification pipeline from the liquid outlet pipe, the magnesium liquid in the solidification pipeline is solidified into magnesium strips under the refrigeration effect of the cooling water jacket, and the argon gas inlet pipe continuously fills argon gas into the heat-preservation second chamber to push the magnesium liquid in the heat-preservation second chamber to enter the liquid outlet pipe and the solidification pipeline; in the solidification pipeline, the magnesium liquid entering later pushes the solidified magnesium strip to move towards the outlet of the solidification pipeline, the magnesium strip reaches the pulling-out device after being pushed out of the outlet of the solidification pipeline, the pinch roller and the conveying roller bed respectively compress the upper end and the lower end of the magnesium strip to pull out the magnesium strip, and a worker designs the pulling-out speed of the pulling-out device according to the actual production condition.

The working principle of the continuous feeding, distilling and casting of the invention is as follows:

during the first work, preparation work needs to be carried out in advance to finish the liquid seal of the steam pipeline, and during the subsequent work, magnesium liquid is always stored in the heat-preservation chamber, so that the preparation work does not need to be carried out again;

the working principle of continuous feeding and distillation is as follows: add crude magnesium in the loading hopper, the volume of loading hopper is far more than the volume of distillation crucible, later to loading hopper and distillation crucible evacuation, and the vacuum is the same, and distillation crucible's reinforced worker is as: opening the discharge valve, adding part of crude magnesium in the charging hopper into the distillation crucible, closing the discharge valve after charging, further ensuring continuous supply of the crude magnesium in the distillation crucible, continuously performing distillation work, closing the discharge valve when the crude magnesium in the charging hopper is insufficient, opening the feeding port, adding the crude magnesium into the charging hopper, then closing the feeding port, vacuumizing the charging hopper again, enabling the vacuum degree of the charging hopper to be the same as that in the distillation crucible, and then repeating the charging work of the distillation crucible.

The working principle of continuous drawing casting is as follows: when the magnesium liquid amount in the first heat-preservation chamber reaches a certain time, the liquid valve A is opened, the magnesium liquid in the first heat-preservation chamber flows into the second heat-preservation chamber through the communicating pipe, when the magnesium liquid amount in the second heat-preservation chamber reaches a certain time, the liquid valve A is closed, the second heat-preservation chamber is independent from the first heat-preservation chamber, the magnesium liquid in the second heat-preservation chamber flows out from the liquid outlet pipe to carry out casting work, and the first heat-preservation chamber cannot be influenced.

Compared with the prior art, the invention has the following beneficial effects.

The continuous feeding, distilling and casting machine can realize continuous feeding, distilling and casting, integrates multiple functions into a whole, and greatly improves the production efficiency.

In the invention, the crude magnesium is distilled and refined to form magnesium liquid, and the magnesium liquid can be directly cast and formed by drawing, compared with the existing production process, the step of remelting the crystallized magnesium is reduced, and the production efficiency is higher.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural view of the drawing and casting apparatus of the present invention.

Fig. 3 is a schematic view of a filter of the present invention.

Fig. 4 is a schematic structural view of the filtering baffle.

In the figure: the device comprises a heating furnace A1, a heating furnace B2, a distillation crucible 3, a heat-preservation crucible 4, a heat-preservation first chamber 41, a heat-preservation second chamber 42, a baffle 43, a communicating pipe 44, a liquid valve A45, an argon gas inlet pipe 46, a liquid outlet pipe 47, a liquid valve B48, a connecting pipe 49, a feeding device 5, a feeding hopper 51, a blanking pipe 52, a discharging valve 53, a drawing and casting device 6, a solidification pipeline 61, a cooling water jacket 62, a conveying roller table 63, a pressing wheel 64, a shearing machine 65, a positioning baffle 66, a contact switch 67, a conveying belt 68, a vacuum pipeline 7, a steam pipeline 8, a steam pipeline 81, a steam pipeline A82, a steam pipeline B83, a filter 831, a filter baffle 831, a vent hole 832, a heater A84, a heater B85, a magnesium liquid 91 and a magnesium strip 92.

Detailed Description

The present invention is further illustrated by the following specific examples.

The continuous vacuum distillation crude magnesium refining and magnesium ingot casting device comprises: the device comprises a heating furnace A1, a heating furnace B2, a distillation crucible 3, a heat-preservation crucible 4, a feeding device 5 and a casting device 6, wherein the distillation crucible 3 is arranged in the heating furnace A1, the heat-preservation crucible 4 is arranged in the heating furnace B2, the interior of the heat-preservation crucible 4 is divided into a first heat-preservation chamber 41 and a second heat-preservation chamber 42 by a baffle 43, a communicating pipe 44 is arranged on the baffle 43, and a liquid valve A45 is arranged in the communicating pipe 44;

the charging device 5 comprises: the distillation crucible device comprises a feeding hopper 51 and a discharging pipe 52, wherein a discharging port is formed in the lower end of the feeding hopper 51, a discharging valve 53 is arranged at the discharging port, the upper end of the discharging pipe 52 is connected with the discharging port, and the lower end of the discharging pipe 52 is communicated with the distillation crucible 3;

distillation crucible 3 through steam conduit 8 with a room 41 that keeps warm is linked together, the lateral wall lower part of two rooms 42 that keep warm still is provided with drain pipe 47, the entry end of drain pipe 47 is located two rooms 42 that keep warm just are provided with liquid valve B48, the exit end of drain pipe 47 stretches out and is connected with the casting device 6 to heating furnace B2 outside, loading hopper 51 and distillation crucible 3 communicate respectively has vacuum pipeline 7, all is provided with the vacuum valve in the vacuum pipeline 7 and is connected with evacuation equipment, two rooms 42 that keep warm still are connected with argon gas intake pipe 46.

The drawing and casting device 6 includes: the solidification pipe 61, the cooling water jacket 62 and the pulling-out device, the entry end of solidification pipe 61 is connected with the exit end of drain pipe 47, the outside cover of solidification pipe 61 is equipped with the cooling water jacket 62, the pulling-out device is located the export outside of solidification pipe 61, the pulling-out device includes: the magnesium strip solidifying device comprises a conveying roller way 63 and a pressing wheel 64 arranged above the conveying roller way 63, wherein the pressing wheel 64 is matched with the conveying roller way 63 and is used for pulling out the solidified magnesium strip from the solidifying pipeline 61.

The drawing and casting device 6 further includes: the magnesium bar shearing machine comprises a shearing machine 65, a positioning baffle 66 and a contact switch 67, wherein the shearing machine 65 is positioned at the tail end of the conveying roller way 63, the positioning baffle 66 is arranged on one side of the shearing machine 65, which is away from the conveying roller way 63, the contact switch 67 is arranged on the end face, facing the shearing machine 65, of the positioning baffle 66, the conveying roller way 63 drives a magnesium bar to penetrate through the shearing area of the shearing machine 65 and move towards the contact switch 67, and the contact switch 67 controls the shearing machine 65 to work.

The vapor pipe 8 includes: steam pipeline A81 and steam pipeline B82, vertical setting steam pipeline A81 connect in distillation crucible 3's upper end, steam pipeline B82's upper end with steam pipeline A81's upper end is linked together, steam pipeline B82's lower extreme is run through and is stretched into in the first room 41 that keeps warm, just steam pipeline B82's lower port is slightly higher than the lower extreme inner wall of the first room 41 that keeps warm, heating furnace B2 is located heating furnace A1's below, be provided with heater A84 in the steam pipeline A81, be provided with heater B85 in the steam pipeline B82.

The vapor pipeline A is also provided with a filter 83, the filter 83 comprises a plurality of layers of filtering baffles 831, and the filtering baffles 831 are provided with a plurality of vent holes 832.

An openable feeding port is arranged at the upper end of the feeding hopper 51, and the side end of the feeding hopper 51 is communicated with the vacuum pipeline 7.

The feed hopper 51, the distillation crucible 3 all are provided with vacuum pressure gauge, the distillation crucible 3, the heat preservation crucible 4 all are provided with the thermometer for the temperature in the monitoring crucible, the feed hopper 51, the distillation crucible 3 still communicate there is the argon gas intake pipe.

An electric heating rod is arranged in the liquid outlet pipe 47, the liquid outlet pipe 47 is connected with the solidification pipeline 61 through a connecting pipe 49, and an electric heating ring is sleeved outside the connecting pipe.

A conveyor belt 68 is arranged below the shearing machine 65.

The technological process of the continuous vacuum distillation crude magnesium refining and magnesium ingot casting device comprises the following steps:

step 1, preparation work, starting a heating furnace B, wherein the heating temperature is 680 ℃, the liquid valve A and the liquid valve B are both in a closed state, magnesium liquid prepared in advance is injected into a heat preservation first chamber, and the magnesium liquid enters the steam pipeline B from the lower end of the steam pipeline B to form a liquid seal for the steam pipeline.

Step 2, vacuumizing, namely adding the crushed crude magnesium into a charging hopper, closing a feeding port, and closing a discharging valve; starting a vacuumizing device, vacuumizing the feeding hopper and the distillation crucible, wherein the vacuum degrees of the components are the same and the vacuum degree is 500 Pa; at this time, the magnesium liquid in the vapor pipe B rises to form a liquid column.

Step 3, performing distillation work, namely opening a discharge valve, adding a proper amount of crude magnesium into a distillation crucible, closing the discharge valve, and opening a heater A to the temperature of 720 ℃; starting a heater B at the temperature of 500-560 ℃; starting the heating furnace A to heat at the temperature of 700-730 ℃, melting the crude magnesium into crude magnesium liquid, and distilling.

And 4, when the magnesium liquid in the first heat-preservation chamber reaches a certain amount, opening the liquid valve A, allowing the magnesium liquid to enter the second heat-preservation chamber through the communicating pipe, and when the magnesium liquid in the second heat-preservation chamber reaches a certain amount, closing the liquid valve A.

Step 5, drawing and casting: and closing the liquid valve A, filling argon into the heat-preservation second chamber through an argon inlet pipe, opening the liquid valve B, enabling the magnesium liquid to flow out of the heat-preservation second chamber through a liquid outlet pipe and enter a solidification pipeline, solidifying the magnesium liquid 91 into magnesium strips 92 in the solidification pipeline, pulling out the magnesium strips through a pulling-out device, and shearing the magnesium strips into small-section magnesium strips through a shearing machine.

The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.

Claims (10)

1. The continuous vacuum distillation crude magnesium refining and magnesium ingot casting device is characterized by comprising the following components: the device comprises a heating furnace A (1), a heating furnace B (2), a distillation crucible (3), a heat-preservation crucible (4), a feeding device (5) and a casting device (6), wherein the distillation crucible (3) is arranged in the heating furnace A (1), the heat-preservation crucible (4) is arranged in the heating furnace B (2), the interior of the heat-preservation crucible (4) is divided into a heat-preservation first chamber (41) and a heat-preservation second chamber (42) by a baffle (43), a communicating pipe (44) is arranged on the baffle (43), and a liquid valve A (45) is arranged in the communicating pipe (44);

the charging device (5) comprises: the distillation crucible comprises a feeding hopper (51) and a discharging pipe (52), wherein a discharging port is formed in the lower end of the feeding hopper (51), a discharging valve (53) is arranged at the discharging port, the upper end of the discharging pipe (52) is connected with the discharging port, and the lower end of the discharging pipe (52) is communicated with the distillation crucible (3);

distillation crucible (3) through steam conduit (8) with a room (41) that keeps warm is linked together, the lateral wall lower part of two rooms (42) that keep warm still is provided with drain pipe (47), the entry end of drain pipe (47) is located just be provided with liquid valve B (48) in two rooms (42) that keep warm, the exit end of drain pipe (47) is stretched out and is connected with to draw to cast device (6) to heating furnace B (2) outside, loading hopper (51) and distillation crucible (3) communicate respectively has vacuum pipeline (7), all is provided with the vacuum valve in vacuum pipeline (7) and is connected with evacuation equipment, two rooms (42) that keep warm still are connected with argon gas intake pipe (46).

2. A continuous vacuum distillation raw magnesium refining, stretch-casting magnesium ingot plant as claimed in claim 1, characterized in that the stretch-casting plant (6) comprises: the solidification device comprises a solidification pipeline (61), a cooling water jacket (62) and a pulling-out device, wherein the inlet end of the solidification pipeline (61) is connected with the outlet end of the liquid outlet pipe (47), the cooling water jacket (62) is sleeved outside the solidification pipeline (61), the pulling-out device is positioned outside the outlet of the solidification pipeline (61), and the pulling-out device comprises: the magnesium strip solidification device comprises a conveying roller way (63) and a pressing wheel (64) arranged above the conveying roller way (63), wherein the pressing wheel (64) is matched with the conveying roller way (63) and used for pulling out a solidified magnesium strip from a solidification pipeline (61).

3. A continuous vacuum distillation raw magnesium refining, stretch-casting magnesium ingot plant as claimed in claim 2, wherein the stretch-casting plant (6) further comprises: the magnesium bar shearing machine comprises a shearing machine (65), a positioning baffle plate (66) and a contact switch (67), wherein the shearing machine (65) is positioned at the tail end of the conveying roller way (63), the positioning baffle plate (66) is arranged on one side, away from the transmission roller way (63), of the shearing machine (65), the contact switch (67) is arranged on the end face, facing the shearing machine (65), of the positioning baffle plate (66), the conveying roller way (63) drives a magnesium bar to penetrate through the shearing area of the shearing machine (65) and move towards the contact switch (67), and the contact switch (67) controls the shearing machine (65) to work.

4. A continuous vacuum distillation raw magnesium refining, stretch cast magnesium ingot plant as claimed in claim 1, wherein the vapor conduit (8) comprises: steam conduit A (81) and steam conduit B (82), vertical setting steam conduit A (81) connect in the upper end of distillation crucible (3), the upper end of steam conduit B (82) with the upper end of steam conduit A (81) is linked together, the lower extreme of steam conduit B (82) is run through and is stretched into in the room (41) that keeps warm, just the lower port of steam conduit B (82) is slightly higher than the lower extreme inner wall in the room (41) that keeps warm, heating furnace B (2) are located the below of heating furnace A (1), be provided with heater A (84) in steam conduit A (81), be provided with heater B (85) in steam conduit B (82).

5. A continuous vacuum distillation crude magnesium refining, magnesium ingot pulling apparatus according to claim 4, characterized in that a filter (83) is further provided in the vapor conduit A, the filter (83) comprising a plurality of filtering baffles (831), the filtering baffles (831) each being provided with a plurality of vent holes (832).

6. A continuous vacuum distillation crude magnesium refining, magnesium ingot casting device according to claim 1, wherein the upper end of the charging hopper (51) is provided with an openable feeding port, and the side end of the charging hopper (51) is communicated with the vacuum pipeline (7).

7. A continuous vacuum distillation crude magnesium refining, magnesium ingot pulling apparatus according to claim 1, wherein the charging hopper (51) and the distillation crucible (3) are provided with vacuum pressure gauges, the distillation crucible (3) and the thermal insulation crucible (4) are provided with thermometers for monitoring the temperature in the crucible, and the charging hopper (51) and the distillation crucible (3) are further communicated with an argon gas inlet pipe.

8. A device for refining and casting magnesium ingot by continuous vacuum distillation of crude magnesium according to claim 3, characterized in that an electric heating rod is arranged in the liquid outlet pipe (47), the liquid outlet pipe (47) is connected with the solidification pipeline (61) through a connecting pipe (49), and an electric heating ring is sleeved outside the connecting pipe.

9. A continuous vacuum distillation rough magnesium refining, stretch cast magnesium ingot apparatus as claimed in claim 8, wherein a conveyor belt (68) is provided below the shear (65).

10. A process flow for a continuous vacuum distillation crude magnesium refining, magnesium ingot casting apparatus according to any one of claims 1 to 9, comprising:

step 1, preparation work, starting a heating furnace B, wherein the heating temperature is 680 ℃, both a liquid valve A and a liquid valve B are in a closed state, injecting magnesium liquid prepared in advance into a heat preservation first chamber, and allowing the magnesium liquid to enter a steam pipeline B from the lower end of the steam pipeline B to form a liquid seal for the steam pipeline;

step 2, vacuumizing, namely adding the crushed crude magnesium into a charging hopper, closing a feeding port, and closing a discharging valve; starting a vacuumizing device, vacuumizing the feeding hopper and the distillation crucible, wherein the vacuum degrees of the components are the same and the vacuum degree is 500 Pa; at the moment, the magnesium liquid in the steam pipeline B rises to form a liquid column;

step 3, performing distillation work, namely opening a discharge valve, adding a proper amount of crude magnesium into a distillation crucible, closing the discharge valve, and opening a heater A to the temperature of 720 ℃; starting a heater B at the temperature of 500-560 ℃; starting the heating furnace A to heat at the temperature of 700-;

step 4, when the magnesium liquid in the first heat-preservation chamber reaches a certain amount, a liquid valve A is opened, the magnesium liquid enters the second heat-preservation chamber through a communicating pipe, and when the magnesium liquid in the second heat-preservation chamber reaches a certain amount, the liquid valve A is closed;

step 5, drawing and casting: and closing the liquid valve A, filling argon into the heat-preservation second chamber through an argon inlet pipe, opening the liquid valve B, enabling the magnesium liquid to flow out of the heat-preservation second chamber through a liquid outlet pipe and enter a solidification pipeline, solidifying the magnesium liquid into magnesium strips in the solidification pipeline, pulling out the magnesium strips through a pulling-out device, and shearing the magnesium strips into small magnesium strips through a shearing machine.

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