CN107119192B - The method and device of electromagnetism vortex driving force purifying molten metal - Google Patents
The method and device of electromagnetism vortex driving force purifying molten metal Download PDFInfo
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- CN107119192B CN107119192B CN201710247575.7A CN201710247575A CN107119192B CN 107119192 B CN107119192 B CN 107119192B CN 201710247575 A CN201710247575 A CN 201710247575A CN 107119192 B CN107119192 B CN 107119192B
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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
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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
- C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
- C22B9/023—By filtering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of methods of electromagnetism vortex driving force continuous purification molten metal, molten metal is set to flow through a chute for being provided with multiple groups non-metallic inclusion removal device with certain speed before molten metal is become a useful person by continuous casting or casting, the special electromagnetic Composite Field that molten metal in convective tank applies a low energy consumption changes original direction of motion of non-metallic inclusion, the field trash collecting region migration that high efficiency drive non-metallic inclusion is arranged into chute, and finally collected by the filter device in field trash collecting region.The present invention also provides a kind of devices of electromagnetism vortex driving force continuous purification molten metal, suitable for various to the demanding refinery processes of molten metal degree of purity, molten metal after continuous purification directly continuous casting or can be molded into the ultralow slab of non-metallic inclusion content.
Description
Technical field
The present invention relates to a kind of molten metal purification process and its devices, more particularly to the molten metal under a kind of outer field action
Purification process and its device are applied to technical field of electromagnetic metallurgy.
Background technique
The premise for obtaining high-quality casting is to obtain clean metal bath.And the presence of non-metallic inclusion destroys
The continuity of metallic matrix is easily formed crackle under stress or forms source of corrosion, to reduce the mechanical property of casting
And service life, and influence apparently and reduce reliability etc..Non-metallic inclusion is usually brought by raw material or melting
Raw oxidation, interior raw reaction are formed in the process.Common non-metallic inclusion has oxide, sulfide, nitride, boride
With complex salt etc., they mostly exist with graininess, and typical particulate inclusions size is at 1-100 μm or so.
Removing the main method of non-metallic inclusion from molten metal at present includes Gas Stirring, wash heat technology, filter
Technology, electromagnetic separation technology, centrifugal separation technology etc..Wherein Gas Stirring, wash heat technology and filter technology mainly pass through
Metal bath is in contact with as the gas of adsorbent, slag liquid or ceramic filter, make adsorbent with it is nonmetallic in melt
Physicochemical or mechanical effect occurs for field trash to achieve the purpose that removal of impurities.The apparatus and process that these methods have is complicated,
Some energy consumption height are uneconomical, and some is unable to high-efficiency and continuous and purifies to molten metal, exist simultaneously dross inclusion adsorption shape easy to fall off
The risk polluted at major diameter field trash.And electromagnetic separation technology be then it is fast-developing in recent years get up a new technology, one
As be by applying a DC current and the magnetic field orthogonal with current direction to metal bath, it is permanent that electromagnetism field interactions generates one
The electromagnetic pinch force that fixed electromagnetic force forces the non-metallic inclusion in melt contrary with electromagnetic force by one, by non-gold
Belong to field trash directional migration to be captured to separator, so that field trash be made to separate from melt.It is this to apply one into melt
The mode of constant electromagnetic power usually can be uneven due to the electric current of effect in the melt and Distribution of Magnetic Field, so that inside molten metal
Reflux or the turbulent flow of large scale are formed, so as to cause this electromagnetism separate mode inefficiency.There are also using to pipe column shape container
Interior melt applies the electromagnetic separation technology of alternating current, and the alternating current due to being passed through molten metal can generate induced magnetism in the melt
, and Induced magnetic field and alternating current interact the extruding force for generating to molten metal and being directed toward axle center, at this time non-metallic inclusion
It can then move and be attached on tube wall against electromagnetic force direction.The efficiency that this mode removes non-metallic inclusion is also extremely low, and
The efficiency of separate pipeline central area field trash is close to zero.Centrifugal separation technology in aqueous solution and cryogenic fluid suspended matter and
Impurity separation aspect obtains good effect, but to the inclusion removal less effective in the metal bath of high temperature, particular for
The field trash efficiency of very fine and density close to metal bath is very low in metal bath, and the high temperature of melt is to fire proofed wood
Washing away for material can also introduce numerous bulky grains and be mingled with.In conclusion be still necessary develops a kind of more efficient section at present
Can and convenient-to-running molten metal purification method and device improve the cleanliness of molten metal.
Summary of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
Electromagnetic complex field forms the method and device for purifying molten metal that vortex driving force takes continuous purification molten metal, in molten metal by continuous casting
Or casting become a useful person before make it through a chute, the electromagnetic complex field that molten metal in convective tank applies a low energy consumption, which is formed, to be vortexed
Driving force, drive molten metal in non-metallic inclusion particles segregation to chute side non-metallic inclusion collecting region, to reach
It is removed from the molten metal continuously flowed to non-metallic inclusion, is purified molten metal.
In order to achieve the above objectives, design of the invention is as follows:
The present invention is provided with non-metallic inclusion removal dress by allowing molten metal to be clean to flow through one with certain speed
The chute set is to make molten metal be purified.Using the nonconducting property of non-metallic inclusion in molten metal, when in convective tank
When the molten metal of flowing applies a lateral DC current, electric current flows through non-metallic inclusion is got around around it, in this way non-
Metallic inclusion meets current side and just will form vertical current component perpendicular to the original lateral flow of electric current along current side.This
When the molten metal section for being applied with transverse current is outer again plus transverse gradients identical with a DC current direction magnetic field, then it is nonmetallic
Field trash meets current side and interacts along the vertical current component of current side and additional gradient magnetic, can be in non-metallic inclusion
Front and back generate move molten metal circumferentially Lorentz force.This Lorentz force can meet current side and suitable in non-metallic inclusion
Current side forms the opposite vortex of both direction, generates the vortex suction force for being similar to tornado, vortex center can generate negative
Pressure attracts non-metallic inclusion.And due to it is additional be transverse gradients magnetic field, so non-metallic inclusion meet current side and
Different along current side magnitude of field intensity, then the intensity being vortexed produced by meaning is of different sizes, and non-metallic inclusion can be by whirlpool
Vacuum suction caused by the big side of rotation intensity is migrated.Cooperate non-metallic inclusion original in chute with molten metal
Flowing, while by electromagnetic complex field to the directional migration of non-metallic inclusion, so that non-metallic inclusion gathers in chute
The non-metallic inclusion collecting region of setting, referred to as poly- slag chute, so that metal bath main body be made to obtain deep purifying.And it is flowed long
Nonmetal object purification device as multistage is set in slot, then it is continuous can be finally reached the molten metal for making to flow in chute
Ground purification.Since metal bath has good electric conductivity, it is equivalent to short-circuit condition, even if being passed through great DC current, institute
The voltage also very little needed, therefore required energy consumption is extremely low.And additional magnetic field generator can generate ladder using permanent magnetic iron block group
Spend magnetic field.Therefore, the present invention can realize the purpose of continuous purification molten metal under conditions of low energy consumption.
According to the above design, the present invention is adopted the following technical solutions:
A kind of method of electromagnetism vortex driving force continuous purification molten metal, the speed stream for setting molten metal to be clean
The chute of multistage non-metallic inclusion removal device has been set it, the non-metallic inclusion removal device of setting is to chute inside stream
The molten metal of warp applies electromagnetic complex field, changes the nonmetallic folder in molten metal using the vortex suction force that electromagnetic complex field generates
Original direction of motion of sundries, the poly- slag chute zone migration that driving non-metallic inclusion is arranged into chute, and finally by poly- slag
Field trash filter device in slot is collected, at least one poly- slag for protruding from chute side wall is arranged in the side of metal spout
Slot applies the gradient magnetic laterally decayed along chute to the molten metal of chute section flowing where poly- slag chute, makes the magnetic of gradient magnetic
Induction peak value is located at poly- slag chute region, and applies the molten metal of chute section flowing where poly- slag chute along the straight of chute transverse direction
Galvanic electricity stream, the molten metal flowed in chute section where making poly- slag chute are in the Electromagnetic heating field action of DC current and gradient magnetic
Under, since non-metallic inclusion is insulator, the DC current along chute lateral flow is encountering non-metallic inclusion at this time
When, DC current will get around non-metallic inclusion, and flow through around non-metallic inclusion, make the front and back two of non-metallic inclusion
Side is respectively formed close to towards current direction and meets current side and the close suitable current side backwards to current direction, in this way nonmetallic
Field trash meets current side and just will form vertical current component perpendicular to DC current along current side, in non-metallic inclusion
Meet current side and be formed by vertical current component and additional gradient magnetic along current side and interact, generation acts on non-gold
Belong to the Lorentz force of the molten metal around field trash, so that the molten metal of the front and rear sides of non-metallic inclusion be driven to generate direction
Opposite circular motion, the Lorentz force for moving molten metal circumferentially can be formed in the molten metal before and after non-metallic inclusion
The opposite microcell eddy flow of both direction, and negative pressure can be generated at the center of microcell eddy flow, by place close to poly- slag chute region institute
The additional gradient magnetic magnetic induction intensity set is bigger, then makes non-metallic inclusion long-range navigation caused by close poly- slag chute side
Hereby power is stronger, and non-metallic inclusion is made to meet suction strength that current side is generated due to eddy flow more close to poly- slag chute region side
Greatly, to make the side in molten metal where non-metallic inclusion to poly- slag chute migrate, simultaneously because non-metallic inclusion is original
With the presence of molten metal longitudinal flow in chute, and then it is vertical along chute to will continue to the non-metallic inclusion entered in poly- slag chute
To flowing, and be finally arranged on collected by the field trash filter device on poly- slag chute head, by chute along molten metal
Total flow direction setting multistage as electromagnetic complex field non-metallic inclusion purification device, the molten metal that flows through in chute is carried out
Process piecewise continuous purification step by step, before molten metal leaves chute, when molten metal leaves from the last one poly- slag chute region
When, so that the degree of purity of molten metal is reached purification standard requirement.
Molten metal to be clean preferably changes between 0-2m/min range in the flowing velocity in chute in above-mentioned chute.
As the further preferred technical solution of above scheme, the molten metal by stating chute purification is aluminium alloy, titanium
The metal bath of alloy, copper alloy or steel alloy, or the molten metal that is purified by above-mentioned chute be high-speed steel, mould steel,
High temperature alloy or other alloys for needing high cleanliness metal material, or be conductive metal, conductive oxide, salt melt.
A kind of device for purifying molten metal for implementing electromagnetism vortex driving force continuous purification molten metal method of the present invention, mainly by
The dynamic chute of bearing metal liquid stream, poly- slag chute, electrode, water-cooled cable, DC power supply, magnetic field generator, field trash filter device,
Chute insulating layer and chute shell composition, wherein working region of the poly- slag chute as capture non-metallic inclusion, electrode and chute
In molten metal directly contact, and from DC power supply pass through molten metal input dc power of the water-cooled cable via electrode into chute
Stream, molten metal of the magnetic field generator into chute apply gradient magnetic, and field trash filter device is as separator to from molten metal
The middle non-metallic inclusion moved in poly- slag chute that is enriched with is collected, and the side of metal spout is arranged in all poly- slag chutes,
This poly- slag chute protrudes from the side wall of chute, and does not significantly change original flow direction of the molten metal in chute, and chute inner wall is full
The foot requirement that does not react and dissolve with chute inner metal liquid, electrode chemically reacted using not occurring with chute inner metal liquid and
The inert electrode plate of dissolution, a pair of electrodes correspond to the left and right sides of installation settings chute region wall surface where poly- slag chute, electrode
It is connected respectively with the output end of corresponding DC power supply by water-cooled cable, the current density by electrode is 1-1010A/m2,
Corresponding two magnetic field generators are set near position on the outside of the chute where poly- slag chute close to electrode, two magnetic field hairs
Raw device provides a gradient magnetic laterally decayed along chute for the chute section where poly- slag chute, and magnetic field gradient is not higher than 2000T2/
M opens the DC power supply being connected with two electrodes when molten metal flows in chute, and the chute section where making poly- slag chute has cross
It circulates to DC current, opens magnetic field generator at the same time, apply gradient magnetic to the chute section where poly- slag chute, make gradient
The magnetic induction intensity peak value in magnetic field is located at poly- slag chute region, makes at the molten metal flowed in chute section where entering poly- slag chute
Under the Electromagnetic heating field action of DC current and gradient magnetic, make to flow with molten metal using electromagnetic complex field non-
Metallic inclusion is migrated and is gathered in poly- slag chute, poly- slag chute head meet to assembled non-metallic inclusion to position at
Field trash filter device is set, makes to migrate and gather the non-metallic inclusion in poly- slag chute finally by field trash filter device institute
It collects.
As the further preferred technical solution of above scheme, the poly- slag chute with electromagnetic complex field is arranged in chute
1-15, all the side of chute is uniformly arranged in poly- slag chute, and the front and back end spacing of two poly- slag chutes of arbitrary neighborhood is 0.1-
1.5m, multiple poly- slag chutes can carry out process piecewise continuous purification step by step to the molten metal for flowing through chute, leave stream in molten metal
Before slot, when molten metal leaves from the last one poly- slag chute region, so that the degree of purity of molten metal is reached purification standard and want
It asks.
As the further preferred technical solution of above scheme, the dynamic runner section use side of above-mentioned bearing metal liquid stream
Shape, sectional area 10-10000cm2, with the chute insulating layer of molten metal contacts be in chute do not react with molten metal to be clean and
Refractory material with thermal insulation property is constituted, and chute shell is using no magnetic metal material；Runner section is strip, template, ellipse
Circle, H-type, I-shaped, track type or trapezoidal；When carrying molten metal to be clean using container, then container is that side is barrel-shaped, round
Tubular or template, then the molten metal in container is in static no flow regime at this time.
As the further preferred technical solution of above scheme, the electrode uses congruent with molten metal to be clean
Air cooled metal electrode, graphite electrode, spraying TiB2Resistance to thermode, the ZrB of conductive resistant to corrosion coating2Electrode or other not with gold
Belong to the metal and alloy electrode of fusant reaction.
It is above-mentioned when being applied by DC power supply for purifying molten metal as the further preferred technical solution of above scheme
When DC current, control voltage is adjustable in 0.01-100V, and control current strength is adjustable within the scope of 1-100000A；Above-mentioned direct current
Electric current uses frequency for the pulse current of 0.01-10000Hz, duty ratio 5-100%.
As the further preferred technical solution of above scheme, above-mentioned magnetic field generator uses Nd-Fe-B permanent magnetic iron block
The gradient magnetic that group, samarium-cobalt magnet, magnet steel or poly- magnetic mode generate, or generate using electromagnet the gradient magnetic of steady
?；Or gradient magnetic or above-mentioned hybrid mode generation gradient magnetic are generated using superconducting magnet, magnetic field generator is in magnetic pole
The magnetic induction intensity generated at face is 0.005-45T, and makes magnetic field gradient in 1-2000T2It is continuously adjusted in/m.
As the further preferred technical solution of above scheme, the field trash filter device is by porous ceramic filter
It constitutes, using foamed ceramics, ceramic microtube, Ceramic Balls, ceramic cloth filter, the ceramic particles filters of bonding or similar porous
Device, and porous ceramic filter can carry out disassembling, assembling and replacing as needed.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage:
1. the present invention needs the process of dedicated container equipment removal non-metallic inclusion compared with the existing technology, the method can
With low cost investment and simple and easy ground purifying molten metal；
2. can continuously be located online using the method and apparatus of electromagnetism vortex driving force purifying molten metal of the present invention
Metal bath is managed, molten metal can also be handled in fixed container；
3. the present invention can apply the Electromagnetic heating that non-metallic inclusion is migrated into chute cohesion slag chute in driving molten metal
, it is equivalent to short circuit since molten metal resistance is extremely low, field generator for magnetic is according to the permanent magnet chunking of Non-energy-consumption and its in addition
His magnet, is able to achieve low energy consumption；
4. the present invention is to the DC current and gradient magnetic of molten metal application to be in the same direction or reversed, what is utilized is direct current
Stream bypass non-metallic inclusion is formed by vertical current component and Actions of Gradient Magnetic Field and is vortexed to generate microcell, will not be in metal
Form big reflux in liquid, and microcosmic vortex can drive microinclusions to generate the movement velocity of millimeter to decimeter grade, therefore
Relative to already present electromagnetic separation technology, removal efficiency of the invention can be in dramatically increasing, even if being mingled with to micron-sized
Object is also highly effective.
5., being capable of continuously convection current using the method and apparatus of electromagnetism vortex driving force purifying molten metal of the invention
It is purified in slot with the metal that certain flow rate flows, especially for continuous casting, by this electromagnetic complex field purifying molten metal
Device apply in continuous casting process between packet greatly and tundish, or be placed within tundish, can effectively be promoted and finally be connected
The cleanliness of slab.
Detailed description of the invention
Fig. 1 is one electromagnetism vortex driving force continuous purification molten metal apparatus structure schematic diagram of the preferred embodiment of the present invention.
Fig. 2 is the mechanism signal of one electromagnetism vortex drive force non-metallic inclusion of preferred embodiment of the present invention migration
Figure.
Specific embodiment
Details are as follows for the preferred embodiment of the present invention:
Embodiment one:
In the present embodiment, referring to Fig. 1 and Fig. 2, realize that electromagnetism vortex driving force used by target of the present invention is continuously net
Change the device of molten metal, chute 1, electrode 3 and 4, water-cooled cable 5, the DC power supply 6, magnetic field mainly moved by bearing metal liquid stream
Generator 7 and 11, field trash filter device 8, chute insulating layer 9, chute shell 10, poly- slag chute 12 form.Wherein 1 length of chute
For 2.5m, 1 cross sectional dimensions of chute is 90mm (depth) * 180mm (width), and 10 material of chute insulating layer is poured using alumine
Material, chute shell 10 use 316L stainless steel material, work of the poly- 12 place chute section of slag chute as capture non-metallic inclusion
Region, it is 70mm that poly- slag chute 12, which protrudes the outer width of 1 side wall of chute, and length and height are matched with electrode 3 and 4, electrode 3 and 4 and stream
Molten metal in slot 1 directly contacts, and passes through molten metal of the water-cooled cable 5 via electrode 3 and 4 into chute 1 from DC power supply 6
It is passed through DC current, DC current, that is, vector J, molten metal of the magnetic field generator 7 and 11 into chute 1 applies the ladder laterally decayed
Magnetic field 15 is spent, field trash filter device 8 moves to the nonmetallic folder in poly- slag chute 12 to from enrichment in molten metal as separator
Sundries 2 is collected.The side of metal spout 1 is arranged in all poly- slag chutes 12, and poly- slag chute 12 protrudes from the side wall of chute 1,
And meet and do not significantly change the structural requirement of original flow direction of the molten metal in chute 1, chute insulating layer 9 meet not with stream
The requirement that 1 inner metal liquid of slot reacts and dissolves.Electrode 3 and 4 using with 1 inner metal liquid of chute occur chemical reaction and it is molten
The inert electrode of solution, in the present embodiment, electrode 3 and 4 are made of high purity graphite, having a size of 300mm (length) * 50mm
(thickness) * 90mm (height), the corresponding installation settings of electrode 3 and 4 is in the left and right sides of poly- 12 place chute of slag chute, 1 region wall surface, electrode 3
It is connected respectively with the output end of corresponding DC power supply 6 by water-cooled cable 5 with 4, the current density by electrode 3 and 4 is 1
×1010A/m2.A pair of magnetic field generator 7 is set near position of 1 outside of chute close to electrode 3 and 4 where poly- slag chute 12
With 11, which is that 1 section of chute where poly- slag chute 12 is provided along the cross vertical with molten metal main flow direction
To attenuation gradient magnetic field 15, magnetic field gradient size is 2000T2/m.Magnetic field generator 7 and 11 uses Nd-Fe-B permanent magnet chunking structure
At, at the magnetic pole strength of the magnetic field generator 7 of poly- slag chute 12 caused by magnetic induction intensity be 1.5T, and magnetic field generator 11
Magnetic pole strength at caused by magnetic induction intensity be 0.1T, when molten metal flows in chute 1, unlatching be connected with electrode 3 with 4
DC power supply 6,1 section of chute where making poly- slag chute 12 has lateral DC current J to circulate, and opens magnetic field generator at the same time
7 and 11, magnetic field generator 7 and 11 item can apply gradient magnetic 15, gradient to the molten metal in 1 section of chute where poly- slag chute 12
The magnetic induction intensity peak value in magnetic field 15 is located at poly- 12 region of slag chute, makes to enter in poly- 1 section of 12 place chute of slag chute and flow
Molten metal is under the Electromagnetic heating field action of DC current J and gradient magnetic 15, is made using electromagnetic complex field with molten metal
The non-metallic inclusion 2 flowed together is migrated and is gathered in poly- slag chute 12, is met on poly- 12 head of slag chute to collected nonmetallic
Field trash 2 to position at be arranged field trash filter device 8,8 material of field trash filter device using alumina base foam pottery
Porcelain filter material receives the non-metallic inclusion 2 for migrating and gathering in poly- slag chute 12 finally by field trash filter device 8
Collection.
Referring to Fig. 1 and Fig. 2, the present embodiment carries out electromagnetism vortex driving force continuous purification metal using device for purifying molten metal
The method of liquid, the speed for setting molten metal to be clean flow through the chute 1 provided with non-metallic inclusion removal device, if
It sets the molten metal flowed through inside two groups of non-metallic inclusion removal device convective tanks 1 and applies electromagnetic complex field, two groups of Electromagnetic heatings
The location interval of the device of field continuous purification molten metal is 1m.Chute 1 has 15 degree of inclination angle in longitudinal direction, by processing to be clean
1200 molten aluminum of fine aluminium system from the higher one end of chute 1 inject, control lower 1200 molten aluminum of one end of chute 1 outflow speed, make
Flowing velocity of 1200 molten aluminums in chute 1 is about 0.3m/min in chute, and 1200 molten aluminums in chute 1 is made to maintain 60mm's
Depth changes original direction of motion of the non-metallic inclusion in molten metal using electromagnetic complex field, drives non-metallic inclusion
It migrates in the poly- slag chute 12 being arranged into chute 1, and is finally collected by the field trash filter device 8 in poly- slag chute 12.By right
The molten metal of poly- 1 section of 12 place chute of slag chute flowing applies the gradient magnetic 15 laterally decayed along metal spout 1, makes gradient
The magnetic induction intensity peak value in magnetic field 15 is located at poly- 12 region of slag chute, and the molten metal flowed to poly- 1 section of 12 place chute of slag chute is applied
Add the DC current J lateral along metal spout 1, the molten metal of poly- 1 section of 12 place chute of slag chute flowing is made to be in DC current J
Under the Electromagnetic heating field action of gradient magnetic 15, since non-metallic inclusion 2 is insulator, at this time along 1 transverse flow of chute
For dynamic DC current J when encountering non-metallic inclusion 2, DC current J will get around non-metallic inclusion 2, and from nonmetallic folder
Flowed through around sundries 2, make the front and rear sides of non-metallic inclusion 2 be respectively formed close to towards current direction meet current side S1 and
Close to suitable the current side S2 backwards to current direction, in this way non-metallic inclusion 2 meet current side S1 and suitable current side S2 will
Form the vertical current component J perpendicular to former DC current Jy, current side S1 is met and along current side S2 in non-metallic inclusion
It is formed by vertical current component JyIt interacts with additional gradient magnetic 15, generation acts on around non-metallic inclusion 2
The Lorentz force F of molten metal, so that molten metal is circumferentially moved Lorentz force F can be in the molten metal of 2 front and back of non-metallic inclusion
The opposite microcell eddy flow 13 and 14 of both direction is formed, and negative pressure can be generated at the center of eddy flow 13 and 14, due to poly- slag chute 12
Side magnetic field strength is higher, therefore eddy flow 13 is bigger than the intensity of eddy flow 14, leads to have net swirling force, makes non-metallic inclusion
2 close to poly- 12 side of slag chute to meet the suction strength that current side S1 is generated due to eddy flow bigger, to make non-gold in molten metal
Side where belonging to from field trash 2 to poly- slag chute 12 migrates, simultaneously because non-metallic inclusion 2 is original vertical with molten metal in chute 1
To the presence of flowing, and then continue the non-metallic inclusion 2 entered in poly- slag chute 12 along 1 longitudinal flow of chute, and it is final
Collected by the field trash filter device 8 for being arranged on poly- 12 head of slag chute, set by total flow direction in chute 1 along molten metal
Electromagnetism vortex driving force purification device as multistage is set, carrying out process to the molten metal for flowing through chute 1, piecewise is continuous step by step
Purification, before molten metal leaves chute 1, when molten metal leaves from the last one poly- 12 region of slag chute, makes the pure of molten metal
Cleanliness reaches purification standard requirement.
Referring to Fig. 1 and Fig. 2, the DC power supply 6 being connected with two electrodes 3 and 4 is opened, 1 section of chute where poly- slag chute 12 is made
There is lateral DC current J to circulate, adjusts DC power supply 6, make the intensity 2000A of DC current J.Due to close to poly- slag chute 12
Magnetic induction intensity caused by the magnetic pole strength of magnetic field generator 7 is 1.5T, much larger than the magnetic pole strength place of magnetic field generator 11
The magnetic induction intensity of generation is 0.1T, therefore the magnetic induction intensity peak value of gradient magnetic 15 is located at poly- 12 region of slag chute.Edge at this time
When the DC current J of 1 lateral flow of chute encounters non-metallic inclusion 2 in 1200 molten aluminums, DC current J will get around nonmetallic folder
Sundries 2 flows through around it, just will form in meet the current side S1 and suitable current side S2 of non-metallic inclusion 2 perpendicular to straight in this way
The vertical current component J of the original lateral flow of galvanic electricity stream Jy.Current side S1 is met and along current side S2 institute in non-metallic inclusion 2
The vertical current component J of formationyIt interacts with additional gradient magnetic 15, can generate before and after non-metallic inclusion 2 makes
The Lorentz force F that 1200 molten aluminums circumferentially move.Lorentz force F can be formed in 1200 molten aluminums of 2 front and back of non-metallic inclusion
The different eddy flow 13 and 14 of intensity, and the center of microcell eddy flow 13 and 14 can generate certain negative pressure.Due to close to poly- slag
15 magnetic induction intensity of additional gradient magnetic of 12 position of slot is bigger, therefore eddy flow 13 is bigger than the intensity of eddy flow 14, that is, anticipates
Taste non-metallic inclusion 2 it is bigger in the suction strength generated due to eddy flow close to poly- 12 side of slag chute, to make 1200 molten aluminums
Side where from middle non-metallic inclusion 2 to poly- slag chute 12 migrates.Simultaneously because non-metallic inclusion 2 is original with golden in chute 1
Belong to the presence of liquid longitudinal flow, the non-metallic inclusion 2 for entering poly- slag chute 12 will continue to along 1 longitudinal flow of chute, thus most
Collected by the field trash filter device 8 for being arranged on poly- 12 head of slag chute eventually, non-metallic inclusion filter device 8 can be as needed
Carry out disassembling, assembling and replacing.In the present embodiment, field trash filter device 8 uses ceramic foam filter.In a steady stream from 1 higher-end of chute
1200 molten aluminums constantly flowed into remain in 1200 molten aluminums after first group of electromagnetic complex field continuous purification metal liquid device purifies
Non-metallic inclusion 2 using the purification of second group of electromagnetic complex field continuous purification metal liquid device, may finally be always
Obtain very high 1200 molten aluminum of cleanliness.
The present embodiment makes molten metal flow through one with certain speed to be provided with before molten metal is become a useful person by continuous casting or casting
The chute 1 of two groups of non-metallic inclusion removal devices, the molten metal in convective tank 1 apply the special electromagnetic Composite Field of a low energy consumption
Change original direction of motion of non-metallic inclusion 2, the poly- slag chute 12 that high efficiency drive non-metallic inclusion 2 is arranged into chute moves
It moves, and is finally collected by the field trash filter device 8 in poly- slag chute 12.The present embodiment electromagnetism, which is vortexed, drives field of force continuous purification gold
The device for belonging to liquid is suitable for the various molten metals to the demanding refinery processes of molten metal degree of purity, after continuous purification
Directly continuous casting or the ultralow slab of non-metallic inclusion content can be molded into.
Embodiment two:
The present embodiment is basically the same as the first embodiment, and is particular in that:
In the present embodiment, 1 length of chute is 2m, cross-sectional width 100mm, is highly 150mm, chute insulating layer 9
It is constituted using magnesia-alumina-carbon brick.The size of electrode 3 and 4 are as follows: 150mm (depth) * 250mm (width), with a thickness of 100mm；Poly- slag chute 12
Protrusion width is 50mm, and length and height are matched with electrode 3 and 4.Chute 1 includes two groups of electromagnetism vortex driving force purifying molten metals
Device, two groups of setting position spacing 0.7m.Chute 1 is placed in the big packet during 304 stainless steel continuous castings and between tundish.Make
304 molten stainless steels in big packet are flowed into from one end of rectangular chute 1, and 304 molten stainless steels after continuous purification are from rectangular stream
The other end outflow of slot 1 enters in tundish, and 304 molten stainless steel flow velocitys are 0.10 meter per second, passes through purification in subsequent tundish
304 molten stainless steels enter 304 stainless steel casting blanks that direct continuous casting in continuous cast mold goes out high-cleanness, high.
In the present embodiment, electrode 3 and 4 is using spraying TiB2The high purity graphite of conductive resistant to corrosion coating.7 He of magnetic field generator
11 use electromagnet, close to poly- slag chute 12 magnetic field generator 7 magnetic pole strength at caused by magnetic induction intensity be 2T, magnetic field hair
The magnetic field strength generated at the magnetic pole strength of raw device 11 is 0.05T.The intensity for the DC current J that DC power supply 6 is applied is
10000A, sufficiently large current strength can guarantee with additional gradient magnetic 15 act on come effectively to non-metallic inclusion 2 into
Row directional migration.Cleanliness by 304 molten stainless steels of above-mentioned two sections of electromagnetism vortex driving force continuous purification greatly improves.
The embodiment of the present invention is illustrated above in conjunction with attached drawing, but the present invention is not limited to the above embodiments, it can be with
The purpose of innovation and creation according to the present invention makes a variety of variations, under the Spirit Essence and principle of all technical solutions according to the present invention
The changes, modifications, substitutions, combinations, simplifications done should be equivalent substitute mode, as long as meeting goal of the invention of the invention, only
Otherwise the technical principle and inventive concept for deviating from electromagnetism vortex driving force continuous purification molten metal method of the present invention, belong to this hair
Bright protection scope.
Claims (10)
1. a kind of method of electromagnetism vortex driving force continuous purification molten metal, it is characterised in that: make molten metal to be clean to set
Fixed speed flows through the chute (1) provided with multistage non-metallic inclusion removal device, it is characterised in that: the nonmetallic folder of setting
Sundries removal device applies electromagnetic complex field to the internal molten metal flowed through of chute (1), the vortex for utilizing electromagnetic complex field to generate
Suction force changes original direction of motion of the non-metallic inclusion (2) in molten metal, drives non-metallic inclusion (2) to chute
(1) poly- slag chute (12) zone migration being arranged in, and finally collected by the field trash filter device (8) in poly- slag chute (12),
At least one poly- slag chute (12) for protruding from chute (1) side wall is arranged in the side of metal spout (1), to where poly- slag chute (12)
The molten metal of chute section flowing applies the gradient magnetic (15) laterally decayed along metal spout (1), makes gradient magnetic (15)
Magnetic induction intensity peak value be located at poly- slag chute (12) region, and the molten metal of chute (1) section flowing where poly- slag chute (12) is applied
Add the DC current (J) along metal spout (1) transverse direction, at the molten metal flowed in chute (1) section where making poly- slag chute (12)
Under the Electromagnetic heating field action of DC current (J) and gradient magnetic (15), since non-metallic inclusion (2) are insulator,
When encountering non-metallic inclusion (2), DC current (J) will get around non-the DC current (J) along chute (1) lateral flow at this time
Metallic inclusion (2), and flowed through around non-metallic inclusion (2), it is respectively formed the front and rear sides of non-metallic inclusion (2)
Current side (S1) and the close suitable current side (S2) backwards to current direction are met close to towards current direction, in this way in nonmetallic folder
Sundries (2) meets current side (S1) and just will form vertical current component perpendicular to DC current (J) along current side (S2)
(Jy), meeting current side (S1) and be formed by vertical current component (J along current side (S2) in non-metallic inclusiony) with it is additional
Gradient magnetic (15) interaction, generates the Lorentz force (F) of the molten metal acted on around non-metallic inclusion (2), thus
It drives the molten metal of the front and rear sides of non-metallic inclusion (2) to generate contrary circular motion, transports molten metal circumferentially
Dynamic Lorentz force (F) can form the opposite microcell eddy flow of both direction in the molten metal before and after non-metallic inclusion (2)
(13,14), and negative pressure can be generated at the center of microcell eddy flow (13,14), due to close to poly- slag chute (12) region position
Additional gradient magnetic (15) magnetic induction intensity is bigger, then produces non-metallic inclusion (2) close to poly- slag chute (12) side
Raw Lorentz force (F) is stronger, make non-metallic inclusion (2) close to poly- slag chute (12) region side meet current side (S1) by
It is bigger in the suction strength that eddy flow generates, to make the side where non-metallic inclusion in molten metal (2) to poly- slag chute (12)
Migration, simultaneously because the original presence with molten metal longitudinal flow in chute (1) of non-metallic inclusion (2), and then make to enter
Non-metallic inclusion (2) in poly- slag chute (12) will continue to along chute (1) longitudinal flow, and finally be arranged on poly- slag chute (12)
The field trash filter device (8) on head is collected, by being arranged as multistage in chute (1) along total flow direction of molten metal
Electromagnetic complex field non-metallic inclusion removal device, carrying out process to the molten metal flowed through in chute (1), piecewise is continuous step by step
Purification, before molten metal leaves chute (1), when molten metal leaves from the last one poly- slag chute (12) region, makes molten metal
Degree of purity reach purification standard requirement.
2. the method for electromagnetism vortex driving force continuous purification molten metal according to claim 1, it is characterised in that: the chute
(1) flowing velocity of molten metal to be clean in chute (1) changes between 0-2m/min range in.
3. the method for electromagnetism vortex driving force continuous purification molten metal according to claim 1, it is characterised in that: by upper
The molten metal for stating chute (1) purification is the metal bath of aluminium alloy, titanium alloy, copper alloy or steel alloy, or passes through above-mentioned stream
The molten metal of slot (1) purification is high temperature alloy or other alloys for needing high cleanliness metal material, or is conductive metal, conduction
Oxide, salt melt.
4. the method for electromagnetism vortex driving force continuous purification molten metal according to claim 1, it is characterised in that: when passing through
When DC power supply (6) is that purifying molten metal applies above-mentioned DC current (J), control voltage is adjustable in 0.01-100V, controls electric current
Intensity is adjustable within the scope of 1-100000A；Above-mentioned DC current (J) uses frequency for the pulse current of 0.01-10000Hz, accounts for
Sky ratio 5-100%.
5. a kind of device for purifying molten metal for implementing electromagnetism vortex driving force continuous purification molten metal method described in claim 1,
Chute (1), poly- slag chute (12), electrode (3,4), the water-cooled cable (5), DC power supply (6), magnetic mainly moved by bearing metal liquid stream
Field generator (7,11), field trash filter device (8), chute insulating layer (9) and chute shell (10) composition, wherein poly- slag chute
(12) working region as capture non-metallic inclusion (2), electrode (3,4) are directly contacted with the molten metal in chute (1), and
Pass through the molten metal input direct-current electric current (J) of water-cooled cable (5) via electrode (3,4) in chute (1) from DC power supply (6),
Molten metal of the magnetic field generator (7,11) in chute (1) applies gradient magnetic (15), and field trash filter device (8) is as separation
Device moves to the non-metallic inclusion (2) in poly- slag chute (12) and is collected to from enrichment in molten metal, all poly- slag chutes (12)
Side in metal spout (1) is set, this poly- slag chute (12) protrudes from the side wall of chute (1), and does not significantly change molten metal
Original flow direction in chute (1), chute (1) inner wall satisfaction do not react and dissolve with chute (1) inner metal liquid
It is required that electrode (3,4) is using the inert electrode plate that chemical reaction and dissolution do not occur with chute (1) inner metal liquid, a pair of electrodes
(3,4) left and right sides of corresponding installation settings chute (1) region wall surface where poly- slag chute (12), electrode (3,4) respectively with it is right
The output end for the DC power supply (6) answered is connected by water-cooled cable (5), and the current density by electrode (3,4) is 1-1010A/
m2, corresponding two magnetic field is set near the position of close electrode (3,4) on the outside of the chute (1) where poly- slag chute (12) and is occurred
Device (7,11), two magnetic field generators (7,11) provide one for chute (1) section where poly- slag chute (12) and laterally decline along chute
The gradient magnetic (15) subtracted, magnetic field gradient (15) are not higher than 2000T2/ m, when molten metal flowing in the chute (1), open with
The connected DC power supply (6) of two electrodes (3,4), chute (1) section where making poly- slag chute (12) have lateral DC current (J) stream
It is logical, magnetic field generator (7,11) are opened at the same time, apply gradient magnetic (15) to chute (1) section where poly- slag chute (12),
So that the magnetic induction intensity peak value of gradient magnetic (15) is located at poly- slag chute (12) region, makes chute where entering poly- slag chute (12)
(1) molten metal flowed in section is under the Electromagnetic heating field action of DC current (J) and gradient magnetic (15), utilizes electromagnetism
Composite Field migrates the non-metallic inclusion (2) flowed with molten metal and gathers in poly- slag chute (12), in poly- slag chute
(12) head meet to assembled non-metallic inclusion (2) come to position at be arranged field trash filter device (8), make to migrate and gather
The non-metallic inclusion (2) collected in poly- slag chute (12) is finally collected by field trash filter device (8).
6. the device of electromagnetism vortex driving force continuous purification molten metal according to claim 5, it is characterised in that: have electromagnetism
The poly- slag chute (12) of Composite Field setting 1-15 in chute (1), all poly- slag chute (12) is unified is arranged the one of chute (1)
Side, the front and back end spacing of the poly- slag chute (12) of two of arbitrary neighborhood are 0.1-1.5m, and multiple poly- slag chutes (12) can be to flowing through chute
(1) molten metal carries out process piecewise continuous purification step by step, before molten metal leaves chute (1), when molten metal is from last
When one poly- slag chute (12) region is left, the degree of purity of molten metal is made to reach purification standard requirement.
7. the device of electromagnetism vortex driving force continuous purification molten metal according to claim 5, it is characterised in that: above-mentioned carrying
Chute (1) sectional area of molten metal flowing is 10-10000cm2, it is with the chute insulating layer (9) of molten metal contacts in chute (1)
It is not reacted with molten metal to be clean and the refractory material with thermal insulation property is constituted, chute shell (10) is using no magnetic metal material
Material；Chute (1) section is strip, ellipse, H-type, track type or trapezoidal.
8. the device of electromagnetism vortex driving force continuous purification molten metal according to claim 5, it is characterised in that: the electrode
(3,4) using the air cooled metal electrode congruent with molten metal to be clean, graphite electrode, spraying TiB2Conductive resistant to corrosion coating
Resistance to thermode, ZrB2Electrode or other metals and alloy electrode for not reacted with metal bath.
9. the device of electromagnetism vortex driving force continuous purification molten metal according to claim 5, it is characterised in that: above-mentioned magnetic field
The gradient magnetic (15) that generator (7,11) uses Nd-Fe-B permanent magnetic iron block group, samarium-cobalt magnet, magnet steel or poly- magnetic mode to generate,
The gradient magnetic (15) of steady is either generated using electromagnet；Or gradient magnetic (15) are generated using superconducting magnet,
Or above-mentioned hybrid mode generates gradient magnetic (15), the magnetic induction intensity that magnetic field generator (7,11) generates at magnetic pole strength is
0.005-45T, and make magnetic field gradient in 1-2000T2It is continuously adjusted in/m.
10. the device of electromagnetism vortex driving force continuous purification molten metal according to claim 5, it is characterised in that: the folder
Impurity filtering device (8) is made of porous ceramic filter, using foamed ceramics, ceramic microtube, Ceramic Balls, ceramic cloth filtering
The ceramic particles filters or similar Multiple-Aperture Device of device, bonding, and porous ceramic filter can be dismounted as needed more
It changes.
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| JP6526769B1 (en) * | 2017-11-15 | 2019-06-05 | 高橋 謙三 | Apparatus for removing impurities from molten metal and method for removing impurities |
| CN110227814B (en) * | 2019-07-16 | 2024-04-02 | 航大(厦门)新材科技有限公司 | Rotary centrifugal filtering tundish for continuous casting and rolling production of clean steel |
| CN110548846A (en) * | 2019-09-19 | 2019-12-10 | 北京科技大学 | radial functional gradient composite material casting equipment and method |
| CN113450984B (en) * | 2020-03-26 | 2024-05-17 | Tdk株式会社 | R-T-B permanent magnet |
| CN111549237B (en) * | 2020-05-20 | 2021-08-06 | 北京科技大学 | Method for separating iron element impurities from pulse current in secondary aluminum melt |
| CN112517866A (en) * | 2020-11-16 | 2021-03-19 | 中国科学院金属研究所 | Method and device for refining magnetic pulse grains at lower end of continuous casting crystallizer |
| CN113441695B (en) * | 2021-05-24 | 2022-08-26 | 中南大学 | Method for removing non-oriented silicon steel inclusions |
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