WO2005049874A1 - Methode pour purifier sous vide un metal en fusion non ferreux - Google Patents

Methode pour purifier sous vide un metal en fusion non ferreux Download PDF

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Publication number
WO2005049874A1
WO2005049874A1 PCT/CN2004/001291 CN2004001291W WO2005049874A1 WO 2005049874 A1 WO2005049874 A1 WO 2005049874A1 CN 2004001291 W CN2004001291 W CN 2004001291W WO 2005049874 A1 WO2005049874 A1 WO 2005049874A1
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Prior art keywords
purification
molten metal
vacuum
clean room
metal
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PCT/CN2004/001291
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English (en)
Chinese (zh)
Inventor
Desheng Huang
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Desheng Huang
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Publication of WO2005049874A1 publication Critical patent/WO2005049874A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/04—Refining by applying a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Definitions

  • the invention relates to a method and a device for purifying a non-ferrous metal melt, in particular to a dynamic vacuum purification as a main purification method and a purification bubble adsorption purification method as an auxiliary purification method, which can be used for both the surface metal melt and the deep metal melt.
  • a dynamic vacuum purification as a main purification method
  • a purification bubble adsorption purification method as an auxiliary purification method
  • non-ferrous metals are oxidized during the melting process to produce oxide slag, while hydrogen is dissolved into the molten metal through various paths. If no purification treatment is performed before casting, the mechanical properties of the casting will be affected in light, and problems such as pores and slag inclusion will be caused, which will cause a lot of defective products. Therefore, non-ferrous metal melt must be purified before casting.
  • the non-ferrous metal purification process has generally adopted the purification bubble adsorption method.
  • this method when bubbles are raised in the molten metal, hydrogen and miscellaneous shields in the molten metal are adsorbed along the way, and they are carried on top of the molten metal and discharged.
  • Purifying bubble adsorption Purification efficiency is generally poor if nitrogen, which is both inexpensive and environmentally friendly, is used. If argon is used, the effect is better, but it is expensive and increases the purification cost. In order to further improve the purification efficiency, it is also required to add a certain proportion of chlorine in argon. This not only brings serious environmental protection problems, but also poses serious health and safety threats to operators. So people use chlorine
  • C1 and fluorine (F) chemicals as purifying agents.
  • Some of the purification agents are made into powder or granules, mixed in the purification gas, using a refractory steel pipe, a flux sprayer or a rotary spraying machine such as the German HM-MAXIJET, which are injected into the molten metal for adsorption purification treatment.
  • degassing treatment is generally carried out in the furnace, and the molten metal flows out of the furnace and is coarsely filtered with a glass wire mesh.
  • Filtration treatment can also use glass mesh cloth for coarse filtration and ceramic foam board for fine filtration. It is also possible to use multiple ceramic foam boards with the same or different meshes in series. Generally, first Use a filter plate with a smaller mesh size and a larger pore size, and then use a filter plate with a larger mesh size and a smaller pore size.
  • a relatively large rotary impeller spray device with a cleaning gas having a pressure of tens to hundreds of bars is required.
  • the utilization rate of the clean room space of the device is very low.
  • the structure of the equipment is complex and large, and the price is high. Buying such a device often costs hundreds of thousands of dollars. Only large factories and a small number of medium factories can use it.
  • a flux sprayer is used to spray the covering flux into the melting furnace.
  • the purification device with application number 90219467. 4 invented by Zhou Xinzhong et al. Uses a rotating stirring wheel to spray the molten metal onto the molten metal.
  • the purification method invented by Li Jinfu et al. With an application number of 02110611. 8 is a purification method in which a flux layer and a ceramic foam filter plate are used in combination.
  • Vacuum purification has excellent purification efficiency on the surface layer of molten metal, but extremely poor on deep molten metal.
  • the figure shows LF6 at 700 ⁇ 730 and residual pressure of 133.3 Pa.
  • a dynamic vacuum processing method is to spray a molten metal into the vacuum furnace after a certain vacuum is reached in the vacuum processing furnace, forming fine droplets, and precipitating hydrogen and oxidized impurities contained therein. This method is still difficult to popularize today.
  • the injection pressure reaches 200 bar, which is a large pressure, but is consumed on the rotating plane of the rotor, and the purified bubbles are cut into fine bubbles, and when they rise
  • the vacuum purification treatment performed in its purification chamber is a static vacuum treatment, and its purification effect is the purification of purified gas bubbles.
  • the theme of the method is "Stirrer equipment", which uses a stirrer. Spraying purified gas and purifying substances to stir is the main purification method of this purification method, so this purification method fails to achieve too ideal results.
  • the vacuum negative pressure of this method is at least 0.2 bar (at leas t 0.2 bar).
  • the method In order to improve its purification capacity, in addition to using purified gas, the method also requires the use of purified particles for chemical adsorption to improve purification efficiency, so it still The dependence on flux has not been disengaged.
  • the traditional purification bubble adsorption method fails to overcome the dependence on the use of flux, and fails to solve the environmental protection problems caused by the use of flux and the production of flux.
  • the existing vacuum purification methods and equipment developers and designers also know the advantages and disadvantages of vacuum purification, they have not found a way to take advantage of the excellent efficiency of vacuum purification on the surface of metal melts, and have not found a way to overcome vacuum purification.
  • the solution to the extremely poor efficiency of deep metal melts also fails to solve how to make all metal melts perform this highly efficient vacuum surface purification treatment uniformly. Therefore, the existing technology cannot be used for industrial applications or cannot be separated from the dependence on the flux. Summary of the invention
  • the present invention aims to solve the above problems, and provides a purification bubble adsorption method as an auxiliary method, which can not only solve the problem of purifying deep metal liquid by vacuum, but also give full play to the characteristics of excellent efficiency of vacuum purification on the surface layer of molten metal.
  • Non-ferrous metal melt vacuum purification method that can also make all metal liquids have equal opportunities to perform vacuum purification treatment on the surface of the metal liquid.
  • the present invention includes:
  • Purification bubbles with nitrogen as the main purification gas are ejected from the bottom of the purification chamber containing the molten metal. During the ascent process, the hydrogen and harmful impurities in the deep molten metal are adsorbed, and they are brought to the top of the molten metal, and Stir up the waves of jumping up and down;
  • the purification method of the present invention requires that the molten metal flows in a predetermined route in the clean room, and it must flow according to the designed direction and flow to ensure that all the molten metal can be vacuum-cleaned uniformly on the surface of the molten metal filled with spray. deal with.
  • the purification method of the present invention can be implemented by three different flow direction control methods of vortex type, wave type and convection type.
  • the molten metal flows into the clean room from the tangential inlet on the cylindrical wall of the clean room, spirals along the cylindrical wall of the clean room, forms a swirling vortex, and performs vortex centrifugation; the bottom of the clean room is sprayed Purify air bubbles, absorb hydrogen and harmful miscellaneous shields in the molten metal, bring the top of the molten metal and stir up the spray.
  • the top of the clean room is evacuated and the metal melt is pumped up. Vacuum purification treatment.
  • the purified metal melt flows into the casting equipment through the clean room.
  • the molten metal flows up and down under the control of the upper and lower gates of the purification equipment, and flows forward in a wave shape.
  • the bottom of the purification equipment sprays purification bubbles to adsorb hydrogen and harmful impurities in the molten metal. Take the top of the molten metal and stir up the spray.
  • the top of the clean room is evacuated, the molten metal is pumped up, and the surface of the molten metal is sprayed and cleaned by vacuum.
  • the molten metal flows up and down through a two-way convection current, and the purified gas is injected into the molten metal through the convection tube hole.
  • the convective molten metal With the convective molten metal, a wave is sprayed on the top of the molten metal in the purification chamber. ;
  • the top of the purification chamber is evacuated, and the surface of the molten metal melt filled with spray is subjected to vacuum purification.
  • the invention also provides purification equipment, vortex, wave, and convection structures for realizing the above method, and three types of equipment for controlling the flow direction of the molten metal according to the present invention.
  • the eddy current purification equipment is composed of a cylindrical purification room, an auxiliary purification room, a cleaning room, a purification cover, and a cleaning cover.
  • the inlet of the clean room is set along the tangential direction of the cylinder wall of the clean room; the outlet of the clean room is connected to the auxiliary clean room or the clean room, and the outlet connected to the auxiliary clean room is located in the upper part of the clean room and is equipped with a liquid level measurement and control device;
  • the outlet is located at the bottom of the clean room;
  • the clean cover is provided with a vacuum cap, a sight glass, and a vacuum meter, wherein the vacuum cap is connected to a vacuum device.
  • the wave type purification equipment is composed of a purification tank and a purification cover, wherein the bottom of the purification tank is arc-shaped, and two sides of the bottom of the tank are provided with rod-shaped purification gas diffusers; the two ends of the purification tank are surrounded by fixed gates and the bottom of the arc-shaped tank to form a metal Melt inlet and outlet; multiple high and low gates are connected to the bottom of the purification cover.
  • the high and low gates extend into the purification tank during operation.
  • the vacuum cover, peep mirror and vacuum are provided on the purification cover.
  • the purifying equipment is connected to the vacuum device through a vacuum cap.
  • the convection purification device is composed of a melting tool or a carrier of a molten metal and a purification cover.
  • the purification cover is provided with a two-way convection and a vacuum cap.
  • the convection is placed in the melting device or the carrier, and the upper end is connected to the purification gas input.
  • the pipes and purification equipment are connected to the vacuum device through a vacuum cap.
  • the convection device is composed of upper and lower columnar bodies made of refractory material.
  • An upper stirring pump is arranged between the upper and lower columnar bodies.
  • a lower stirring pump is arranged at the bottom of the lower columnar body. The claws of the two stirring pumps are opposite to each other.
  • the purification method of the present invention requires that spray waves be generated on the surface of the molten metal during the purification process, which is anti-traditional, because the traditional purification bubble adsorption purification method must prevent the spray on the surface of the molten metal.
  • Traditional purification equipment is generally closed or semi-closed, and the space in the purification room needs to maintain a slight pressure. Avoid inhalation and purification of outdoor air, including oxygen, to generate new oxide slag.
  • the surface layer and headspace of the molten metal are therefore full of hydrogen and oxide slag adsorbed from the purification bubbles during the purification process. If sprays appear on the top of the molten metal, these hydrogen and oxide slags are bound to be drawn into the molten metal , Make the purification quality worse.
  • the rotating impeller method described in the background section is characterized in that there is no spray on the surface of the molten metal and only slight shaking, so effectively preventing hydrogen and harmful impurities on the surface and top space of the molten metal from being entangled in the metal In the melt.
  • the purification chamber is also closed, but the vacuum is evacuated.
  • the molten metal will not only be oxidized, but also reduce the oxidized slag of hydrogen. Hydrogen and oxidizing impurities are extracted as soon as they are precipitated from the molten metal, so there is no need to worry that when the surface spray of the molten metal rolls over, it will be drawn into the molten metal. Moreover, due to its rapid decrease in concentration and pressure, hydrogen and harmful impurities are rapidly precipitated from the molten metal having a higher concentration and pressure.
  • the vacuum negative pressure not only absorbs hydrogen and oxidative impurities in the headspace, pulls the metal melt higher, but also sucks out hydrogen and oxidative impurities in the metal melt.
  • the numerous large and small sprays formed on the surface of the molten metal further weaken or destroy the surface tension of the molten metal and the resistance it forms, making the original molten metal and purify the hydrogen and The harmful impurities are more easily sucked out by the vacuum negative pressure.
  • the purification performance of the present invention is superior to the general purification bubble adsorption method.
  • the spray generated by the purification method of the present invention on the top of the metal liquid fully exerts the advantage of the vacuum suction to purify the surface layer of the metal melt particularly well.
  • the spray shortens the distance between hydrogen and harmful impurities in the molten metal to the surface of the molten metal. Under vacuum conditions, it shortens the distance between its precipitation and suction by vacuum negative pressure. The second is because the spray expands. Under the vacuum condition, the surface area of the molten metal is expanded by the vacuum negative pressure in the vacuum, and the channels for the precipitation and extraction of hydrogen and harmful impurities in the molten metal are increased.
  • the third reason is that, as the liquid metal on the surface layer rolls along with the liquid waves, the turns are directly attracted by the vacuum negative pressure on the surface of the metal liquid.
  • the hydrogen and various harmful impurities in the deep metal melt are absorbed along the way by the purification bubbles as they rise in the metal melt, and they are concentrated in the spray of the surface layer of the metal melt.
  • the greater the depth the better the adsorption effect.
  • the use of bubble adsorption purification in the present invention not only exerts the advantage of vacuum purification on the surface of the molten metal, but also overcomes the disadvantage that the vacuum purification has a very poor effect on the deep molten metal.
  • the vacuum negative pressure used in the purification method of the present invention is 10 Torr to 0.1 Torr, while EP1081240A requires a vacuum negative pressure of "at leas t 0.2 bar", 1 Torr is equal to 0.00001333bar, which is 150 times different from 0.2bar .
  • Lower vacuum negative pressure and lower purge gas supply pressure make this The production and production cost of the invention can be greatly reduced, and it is easy to operate.
  • the invention does not rely on the use of a flux to improve the purification efficiency. It relies on the dialectical combination of various forces through the design of the structure of the purification device, so that they are complementary and consistent, promote each other, and give full play to the purification itself. Power to improve purification efficiency.
  • the present invention uses purified bubbles to stir up waves on the surface layer of the molten metal, and fully utilizes the advantages of vacuum to clean the surface of the molten metal, which in turn enhances the purification efficiency of the bubbles to the deep molten metal. Adsorbing hydrogen and harmful impurities in the deep metal melt, not only overcomes the helplessness of vacuum purification on the deep metal melt, but also further exerts the advantage of vacuum purification on the surface layer of the metal melt.
  • the invention pays attention to the design of the equipment structure, and controls the flow direction of the molten metal so that it can be uniformly and efficiently processed under vacuum, which not only further exerts the advantage of the excellent purification efficiency of the molten metal surface layer by vacuum, but also further strengthens the deep molten metal Purification. Because of this, the purification efficiency of the present invention can obtain a qualitative leap. Purification by the method and equipment of the present invention for 1 minute has an effect equivalent to, or even more than, FILD, SNIF, Alpur and other purification methods for several minutes or even 10 minutes. The purification effect of the present invention depends on the purification time of the molten metal in the equipment purification room.
  • the hydrogen content can be reduced to 0.25cm 3 / 100g or less, 2 minutes, it can be reduced to 0.15cm 3 / 100g or less.
  • the present invention is an environmentally friendly and efficient purification method. It does not use a large amount of fuel for heating and insulation like the methods in the prior art, so it not only reduces CO 2 emissions and energy consumption, but also reduces production costs.
  • the present invention does not need to use a relatively large rotating impeller device, nor does it need to use a heating device, and the purification space is fully utilized, so it is unique in that the equipment is miniaturized and the price is popular.
  • FIG. 1 is a schematic structural diagram of a purification device according to Embodiment 1 of the present invention, wherein FIG. 1A is a front sectional view, FIG. 1B is a top sectional view of FIG. 1A, and FIG. 1C is a side sectional view of the cleaning room and the auxiliary purification room of FIG. 1A.
  • 1D is a side cross-sectional view of the clean room of FIG. 1B, and
  • FIG. 1E is a schematic view of the exit of the clean room in which the auxiliary clean room is a cylindrical type.
  • FIG. 2 is a plan sectional view of a structure in which the purification equipment of the present invention is provided with different molten metal inlets and different outlet directions according to different needs.
  • Figures 2 to 2F respectively show that the direction of the molten metal outlet is 90 degrees from the inlet, and the outlet and the inlet are the same
  • FIG. 3A is a front sectional view
  • 3C2 is a side view of the lower gate in FIG. 3A.
  • FIG. 4 is a schematic structural view of a purification device according to Embodiment 2 of the present invention in a purification state, wherein FIG. 4A is a front sectional view, and FIG. 4B is a side sectional view of FIG. 4A.
  • 5 is a schematic structural diagram of a purification device according to Embodiment 3 of the present invention, wherein FIG. 5A1 is a schematic structural diagram of a Chinese-oriented agitator of a purification device, FIG. 5A2 is a cross-sectional view taken along A-A of FIG. 5A1, and FIG. FIG. 5B is a schematic diagram of a state where the agitator is rotated clockwise, and FIG. 5C is a schematic diagram of a state where the agitator is rotated counterclockwise.
  • Fig. 6 is a graph showing the degassing kinetics of the existing static vacuum treatment method at different depths in the furnace. detailed description
  • This example gives an example of a vortex purification method.
  • the purification step of the eddy current purification method is to flow the molten metal to be processed from the inlet 111 of the purification device, and circle the cylindrical wall of the purification chamber 11 to form a swirling vortex, and perform a centrifugal treatment on the molten metal.
  • Large metal molecules are thrown to the periphery, and lighter hydrogen and oxidative impurities are squeezed towards the center of the vortex.
  • the nitrogen bubbles (Ni trogen) ejected from the nitrogen diffusion rod embedded in the bottom of the clean room rise in the molten metal, they absorb hydrogen and harmful impurities in the molten metal along the way, bring them to the top of the molten metal, and stay there. Surge.
  • vacuum is evacuated in the headspace of the clean room: the molten metal is pumped up, and the surface molten metal filled with spray is subjected to vacuum purification.
  • Purified metal melt flows into the auxiliary purification chamber 11A (see FIG. 1B) through the purification chamber outlet 112, and continues to perform dynamic vacuum purification treatment at the top of the auxiliary purification chamber, and then passes downwards through the auxiliary purification chamber 11A and the cleaning chamber 12
  • the intermediate passage 11A2 flows into the clean room 12, and after rising, flows into the casting equipment through the clean room outlet 121 for casting.
  • the molten metal in the purification equipment is discharged from the drainage port 114 in the purification chamber 11 and the drainage port 122 in the cleaning chamber 12, and the molten metal in the thermal insulation device is heated by the gas gun at this drainage port.
  • the molten metal melt has a protective effect on the purge gas injection device. If the molten metal stored in the purification equipment is to be removed, or the purification gas injection device needs to be overhauled or replaced, all the molten metal in the device is discharged from the clean room inlet 111 and the clean room drain outlet 123.
  • FIGS. 1A to 1E illustrate a vortex-type purification device that implements the method described in Embodiment 1.
  • the purification device 10 is composed of a cylindrical purification chamber 11, an auxiliary purification chamber 11A, a cleaning chamber 12, a purification hood 13, and a cleaning hood 14.
  • the purification chamber 11 is generally cylindrical, and it may be one or more.
  • FIG. 1 shows a vortex-type purification apparatus with an auxiliary purification chamber 11A.
  • a nitrogen diffusion device 113 is embedded in the bottom of the clean room
  • a molten metal inlet 111 is provided in the tangential direction of the bottom of the cylindrical clean room
  • the clean room has a liquid discharge port 114.
  • a clean cover 13 is provided on the top of the clean room, and a vacuum cap 131, a sight glass 133, and a vacuum gauge 134 are provided on the clean cover 13.
  • the purification chamber 11 is connected to a vacuuming device through a vacuum cap 131.
  • the metal melt outlet 112 is located in the upper part of the clean room and is connected to the auxiliary clean room 11A (see Figure 1B). If the auxiliary clean room is also cylindrical, the outlet of the clean room should be located on the tangent to the cylinder wall of the auxiliary clean room (as shown in Figure 1B). 1E).
  • the cleaning chamber 12 is provided with liquid discharge ports 122 and 123, and a metal melt outlet 121 is connected to the casting equipment.
  • a clean cover 14 is provided on the top of the clean room. If there is an auxiliary clean room, the clean cover is shared with the auxiliary clean room 11A.
  • a vacuum cap 141, a sight glass 143, and a vacuum meter 144 should be installed on the cover. The vacuum unit is connected.
  • the metal melt inlet of the purification chamber should be located at the upper part of the clean room, and the height is close to the liquid discharge port of the clean room; if the number of purification chambers is double, the metal melt inlet of the purification room It should be located at the bottom of the clean room. The outlets of the molten metal flowing into the clean room of the clean room are located at the bottom. The metal melt outlet of the clean room is set at the bottom, and a closed chute should be connected to make the height of the inlet and outlet of the purification equipment the same.
  • the metal melt inlet 111 and metal melt outlet 112 of the clean room can be set in different directions as required.
  • Figures 2 ⁇ 2F are schematic diagrams of different metal melt inlets and different outlet directions according to different needs.
  • the outlet direction may be 90 degrees from the inlet as shown in FIG. 2A, or may be the same direction as the inlet as shown in FIG. 2B.
  • the exit direction can be 90 degrees from the inlet (as shown in Figure 2C), or it can be the same direction as the inlet (as shown in Figure 2D).
  • the molten metal inlet is shown in Figs.
  • the exit direction can be 90 degrees from the inlet (as shown in Fig. 2E), or it can be opposite to the inlet (as shown in Fig. 2F). It is worth noting that if the number of purification chambers of the vortex-type purification equipment is singular, the metal melt water inlet of the purification chamber should be located on the tangent to the upper cylinder wall of the purification chamber, and its height is close to the water outlet of the clean chamber; Even if the number is double, the water inlet for the molten metal in the clean room should be located on the tangent to the cylinder wall at the bottom of the clean room. Where the molten metal water inlet is set at the bottom, a closed chute should be connected to make the height of the inlet and outlet of the purification equipment the same.
  • This example gives an example of the wave purification method.
  • the molten metal fluctuates between the top of the low gate and the channel at the bottom of the high gate in the purification tank, and the wave moves forward. Regardless of whether the molten metal is rising or downflow, the hydrogen and oxidizing impurities with lower density have a tendency to separate in the flow.
  • the nitrogen (Nitrogen) bubbles ejected from the nitrogen diffusion rods on both sides of the bottom of the tank rise in the molten metal, they adsorb the hydrogen and oxidized impurities in the molten metal, bring them to the top of the molten metal, and stimulate them there.
  • FIG. 3 to FIG. 4 show a wave-type purification device that implements the method described in Embodiment 2.
  • FIG. 3 is a schematic structural diagram of a purification device in a non-purified state
  • FIG. 4 is a schematic structural diagram of a purification device in a purified state.
  • the device is composed of a purification tank 21 and a purification cover 22.
  • the bottom of the purification tank is arc-shaped, and purification gas diffusion rods 211 are embedded on both sides of the bottom of the arc-shaped tank.
  • the two ends of the arc groove are respectively an inlet 213 and an outlet 214 for the molten metal.
  • the entrance and exit are close to the bottom of the groove, and are surrounded by the arc groove bottom and the shutter 212.
  • the purge cover is equipped with a peep mirror 222, a vacuum pressure gauge 223 and a vacuum cap 221.
  • the bottom of the purge cover is connected with a high gate 224 and a low gate 225.
  • the shape of the low gate 225 corresponds to the shape of the purification tank (see Figure 3C2).
  • the shape of the high-level shutter 224 corresponds to the shape of the purification tank (see Figure 3C1), they can rise or fall with the purification hood and extend into the purification tank during work.
  • the number of shutters depends on the length of the tank and the specific needs , At least one (lower gate), usually five, of course, can be more, and is usually an odd number.
  • the purification equipment is connected to the evacuation device through a vacuum cap.
  • This example gives an example of a convection purification method.
  • the purification steps of the convection purification method can be referred to FIG. 5.
  • FIG. 5B when the convection rotates clockwise, the molten metal flows from the upward stirring pump 311 and is sprayed through the central tube hole 313 and the lower stirring pump 312. It forms a cycle with the molten metal outside the convection.
  • FIG. 5C when the convection rotates counterclockwise, the molten metal flows from the lower stirring pump 312, and is ejected through the central tube hole 313 and the upper stirring pump 311, and forms another kind of molten metal outside the convection. cycle. The molten metal generates up and down convection in the cycle.
  • a small-diameter tube hole 314 is connected to the stirrer. Nitrogen is injected into the molten metal through a small-diameter tube hole, generating bubbles, adsorbing oxidized impurities and hydrogen in the molten metal, carrying the top of the molten metal, and agitating large and small waves (Surge). Vacuum is applied to the top of the purification device to vacuum clean the surface of the molten metal filled with spray.
  • FIG. 5 shows a convection-type purification device that implements the method described in Embodiment 3.
  • the convection-type purification device is composed of a molten metal carrier or carrier 40 and a purification cover 30 to purify
  • the cover includes a two-way convection device 31 and a vacuum cap 32, wherein the convection device 31 is placed in the melting device or the carrier 40, the upper end of which is connected to a purge gas input pipe, and the vacuum cap is connected to a vacuum device.
  • the purge hood is also equipped with a sight glass and an electric heating rod.
  • the purifying cover can be covered on various different stoves or metal melt carriers to form a closed space for purifying treatment.
  • the convection unit 31 is composed of upper and lower columnar bodies 311 and 312 made of refractory material.
  • An upward stirring pump 311 is arranged between the upper and lower cylindrical bodies.
  • a lower stirring pump 312 is arranged at the bottom of the lower cylindrical body 312.
  • the claws of the pumps are opposite to each other (see Figs. 5A2 and 5A3), and they are connected through the central tube hole 313 of the lower column.
  • a purge gas delivery tube hole having a diameter smaller than that of the lower tube is provided in the center of the upper column 311 314, The pipe hole is connected to the purification gas supply device.
  • the two can be combined into a whole, or they can be separated independently; the metal melt stove can be fixed, the vacuum cover can be moved to the stove, or the vacuum cover can be fixed, and the moving carrier can be the vacuum cover.

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Abstract

L'invention concerne une méthode pour purifier sous vide un métal non ferreux fondu. Cette méthode consiste à: a) faire barboter un gaz composé principalement d'azote à travers le métal en fusion, à partir du fond du compartiment de purification, pour adsorber l'hydrogène et les impuretés du métal en fusion, et pour les amener à la surface du métal en fusion; b) évacuer l'espace supérieur du compartiment de purification à une pression comprise entre 0,1 et 10 torr, et purifier sous vide le métal en fusion superficiel; c) contrôler la direction d'écoulement du métal en fusion, de sorte à le purifier uniformément. Les équipements variés permettant de mettre la méthode en oeuvre sont décrits dans la description. Ces équipements de purification peuvent se présenter sous forme de vortex, d'onde et de convection. L'invention permet de purifier sous vide efficacement un métal en fusion, et d'exploiter pleinement l'efficacité élevée d'un métal en fusion superficiel. L'invention rend possible une purification sous vide uniforme et efficace de l'ensemble du métal en fusion.
PCT/CN2004/001291 2003-11-24 2004-11-12 Methode pour purifier sous vide un metal en fusion non ferreux WO2005049874A1 (fr)

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US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials
CN102719680A (zh) * 2012-06-21 2012-10-10 重庆硕龙科技有限公司 一种轻金属及其合金熔体的净化方法
CN115094188A (zh) * 2022-08-25 2022-09-23 大峘集团有限公司 一种铁水脱硫扒渣机改造装置及其操作方法

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CN108165757A (zh) * 2018-02-08 2018-06-15 黄德盛 一种改进型有色金属熔液净化装置和净化方法

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