CN107119192A - 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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- CN107119192A CN107119192A CN201710247575.7A CN201710247575A CN107119192A CN 107119192 A CN107119192 A CN 107119192A CN 201710247575 A CN201710247575 A CN 201710247575A CN 107119192 A CN107119192 A CN 107119192A
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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 method of electromagnetism vortex driving force continuous purification molten metal, molten metal is set to flow through one there is provided the chute of multigroup non-metallic inclusion removal device with certain speed before molten metal is become a useful person by continuous casting or cast, molten metal in convective tank applies original direction of motion of the special electromagnetic Composite Field change non-metallic inclusion of a low energy consumption, the field trash collecting region migration that high efficiency drive non-metallic inclusion is set into chute, and finally collected by the filter in field trash collecting region.The present invention also provides a kind of device of electromagnetism vortex driving force continuous purification molten metal, high refinery processes are required to molten metal degree of purity suitable for various, the molten metal after continuous purification directly continuous casting or can be molded into the ultralow strand of non-metallic inclusion content.
Description
Technical field
The molten metal under technique and its device, more particularly to a kind of outer field action is purified the present invention relates to a kind of molten metal
Technique and its device are purified, applied to technical field of electromagnetic metallurgy.
Background technology
The premise for obtaining high-quality casting is to obtain clean metal bath.And the presence of non-metallic inclusion is destroyed
The continuity of metallic matrix, crackle is easily formed under stress or source of corrosion is formed, so as to reduce the mechanical property of casting
And service life, and influence apparent and reduction reliability etc..Non-metallic inclusion is usually to be brought into by raw material or melting
During in raw oxidation, interior raw reaction formed.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, which are mainly, to be passed through
Metal bath is in contact with the gas as adsorbent, slag liquid or ceramic filter, make adsorbent with it is nonmetallic in melt
Physicochemical or mechanical effect occurs for field trash to reach the purpose of removal of impurities.The apparatus and process that these methods have is complicated,
Some high energy consumptions are uneconomical, and the high-efficiency and continuous that is unable to having is purified to molten metal, while there is dross inclusion adsorption shape easy to fall off
The risk polluted into major diameter field trash.And electromagnetic separation technology is then the new technology that fast development is got up in recent years, one
As be that it is permanent that electromagnetism field interactions produces one by applying a DC current and the magnetic field orthogonal with the sense of current to metal bath
Fixed electromagnetic force forces the non-metallic inclusion in melt by an electromagnetic pinch force in opposite direction with electromagnetic force, by non-gold
Category field trash directional migration is captured to separator, so that field trash is separated 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
Backflow or the turbulent flow of large scale are formed, so as to cause this electromagnetism separate mode inefficiency.Also use to pipe column shape container
Interior melt applies the electromagnetic separation technology of alternating current, because the alternating current for being passed through molten metal can produce induced magnetism in the melt
, and Induced magnetic field and alternating current interact the extruding force for being produced to molten metal and pointing to axle center, now non-metallic inclusion
It can be then attached to against the motion of electromagnetism force direction on tube wall.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 the aqueous solution and cryogenic fluid suspension and
Obtain good effect in terms of impurity separation, but to the inclusion removal less effective in the metal bath of high temperature, particular for
Very fine and density is very low close to the field trash efficiency of metal bath 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 summary, it is still necessary developing a kind of more efficient section at present
Can and convenient-to-running molten metal purification method and device improve the cleanliness factor of molten metal.
The content 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 formation vortex driving force carrys out the method and device for purifying molten metal of continuous purification molten metal, in molten metal by continuous casting
Or cast become a useful person before be passed to molten metal in a chute, convective tank and apply the electromagnetic complex field formation of a low energy consumption to be vortexed
Driving force, driving molten metal in non-metallic inclusion particles segregation to chute side non-metallic inclusion collecting region, so as to reach
It is removed to non-metallic inclusion from the molten metal continuously flowed, is purified molten metal.
To reach above-mentioned purpose, design of the invention is as follows：
The present invention by allow molten metal to be clean with certain speed flow through one there is provided non-metallic inclusion remove fill
The chute put is so that molten metal is purified.Using the nonconducting property of non-metallic inclusion in molten metal, when in convective tank
When the molten metal of flowing applies a horizontal DC current, electric current will get around non-metallic inclusion and be flowed through around it, so non-
Metallic inclusion meets current side and will form the vertical current component perpendicular to the original lateral flow of electric current along current side.This
When be applied with transverse current molten metal section again additional one with DC current direction identical transverse gradients magnetic field, then it is nonmetallic
Field trash meets current side and the vertical current component along current side interacts with additional gradient magnetic, can be in non-metallic inclusion
Front and rear generation make the Lorentz force that molten metal is circumferentially moved.This Lorentz force can meet current side and suitable in non-metallic inclusion
The vortex of current side formation both direction conversely, produces the vortex suction force similar to tornado, vortex center can produce 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 of vortex is of different sizes produced by meaning, non-metallic inclusion can be by whirlpool
Vacuum suction produced by the big side of rotation intensity is migrated.Coordinate non-metallic inclusion with molten metal in chute it is original
Flowing, while by directional migration of the electromagnetic complex field to non-metallic inclusion so that non-metallic inclusion is gathered in chute
The non-metallic inclusion collecting region of setting, referred to as poly- slag chute, so that metal bath main body obtains deep purifying.And in long stream
Nonmetal object purifier as multistage is set in groove, then can be finally reached makes the molten metal flowed in chute continuous
Ground is purified.Because metal bath has good electric conductivity, 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 produce 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.
Conceive more than, the present invention uses following technical proposals：
A kind of method of electromagnetism vortex driving force continuous purification molten metal, the speed stream for setting molten metal to be clean
The configured chute of multistage non-metallic inclusion removal device, the non-metallic inclusion removal device of setting flows to inside chute
The molten metal of warp applies electromagnetic complex field, and the vortex suction force produced using electromagnetic complex field changes the nonmetallic folder in molten metal
Original direction of motion of debris, the poly- slag chute zone migration that driving non-metallic inclusion is set into chute, and finally by poly- slag
Field trash filter in groove is collected, the poly- slag for setting at least one to protrude from stream groove sidewall in the side of metal spout
Groove, applies the gradient magnetic along chute transverse direction decay to the molten metal that chute section where poly- slag chute flows, makes the magnetic of gradient magnetic
Induction peak value applies along the straight of chute transverse direction positioned at poly- slag chute region, and to the molten metal of chute section flowing where poly- slag chute
Electric current is flowed, the molten metal of flowing is in the Electromagnetic heating field action of DC current and gradient magnetic in chute section where making poly- slag chute
Under, because non-metallic inclusion is insulator, now the DC current along chute lateral flow is running into non-metallic inclusion
When, DC current will get around non-metallic inclusion, and be flowed through around non-metallic inclusion, make front and rear the two of non-metallic inclusion
Side forms close to towards the sense of current and meets current side and the suitable current side close to the dorsad sense of current respectively, so nonmetallic
Field trash meets current side and will form the vertical current component perpendicular to DC current along current side, in non-metallic inclusion
The vertical current component met current side and formed along current side interacted with additional gradient magnetic, act in non-gold
Belong to the Lorentz force of the molten metal around field trash, so as to drive the molten metal of the front and rear sides of non-metallic inclusion to produce direction
Opposite circular motion, makes the Lorentz force that molten metal is circumferentially moved to be formed in the molten metal before and after non-metallic inclusion
The opposite microcell eddy flow of both direction, and the center of microcell eddy flow can produce negative pressure, by place close to poly- slag chute region institute
The additional gradient magnetic magnetic induction intensity put is bigger, then causes non-metallic inclusion close to the long-range navigation produced by poly- slag chute side
Hereby power is stronger, non-metallic inclusion is being met suction strength that current side produced due to eddy flow more close to poly- slag chute region side
Greatly, so that non-metallic inclusion is migrated to the side where poly- slag chute in molten metal, 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 may proceed to the non-metallic inclusion entered in poly- slag chute
To flowing, and be finally arranged on collected by the field trash filter on poly- slag chute head, by chute along molten metal
Total flow direction set multistage as electromagnetic complex field non-metallic inclusion purifier, to flow through the molten metal in chute carry out
Flow piecewise continuous purification step by step, before molten metal leaves chute, when molten metal leaves from last poly- slag chute region
When, the degree of purity of molten metal is reached purification standard requirement.
The flowing velocity of molten metal to be clean in chute changes preferably between 0-2m/min scopes in above-mentioned chute.
As the further preferred technical scheme of such scheme, the molten metal purified by stating chute is aluminium alloy, titanium
The metal bath of alloy, copper alloy or steel alloy, or the molten metal purified by above-mentioned chute is high-speed steel, mould steel,
High temperature alloy or other alloys for needing high cleanliness metal material, or be conducting 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
Bearing metal liquid flowing chute, poly- slag chute, electrode, water-cooled cable, dc source, magnetic field generator, field trash filter,
Chute heat-insulation 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 molten metal input dc power of the dc source by water-cooled cable via electrode into chute
Stream, molten metal of the magnetic field generator into chute applies gradient magnetic, and field trash filter is as separator to from molten metal
The middle non-metallic inclusion moved in poly- slag chute that is enriched with is collected, and all poly- slag chutes are arranged on the side of metal spout,
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 inwall is expired
The foot requirement that does not react and dissolve with chute inner metal liquid, electrode using not occurring to chemically react with chute inner metal liquid and
The inert electrode plate of dissolving, the left and right sides of a pair of electrodes correspondence installation settings chute region wall where poly- slag chute, electrode
The output end with corresponding dc source is connected by water-cooled cable respectively, and the current density by electrode is 1-1010A/m2,
Corresponding two magnetic field generators are set near the position of electrode on the outside of the chute where poly- slag chute, 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, when molten metal flows in chute, opens the dc source being connected with two electrodes, and the chute section where making poly- slag chute has horizontal stroke
Circulated to DC current, at the same time open magnetic field generator, applied 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 where entering poly- slag chute at the molten metal of the interior flowing of chute section
Under the Electromagnetic heating field action of DC current and gradient magnetic, using electromagnetic complex field make with molten metal flow it is non-
Metallic inclusion is migrated and gathered in poly- slag chute, met on poly- slag chute head to assembled non-metallic inclusion to position at
Field trash filter is set, makes migration and gathers the non-metallic inclusion in poly- slag chute finally by field trash filter institute
Collect.
As the further preferred technical scheme of such scheme, the poly- slag chute with electromagnetic complex field is set in chute
1-15, whole poly- slag chutes are uniformly arranged on the side of 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 flow piecewise continuous purification step by step to the molten metal for flowing through chute, and stream is left in molten metal
Before groove, when molten metal leaves from last poly- slag chute region, the degree of purity of molten metal is set to reach that purification standard will
Ask.
It is used as the further preferred technical scheme of such scheme, the runner section use side of above-mentioned bearing metal liquid flowing
Shape, sectional area is 10-10000cm2, in chute with the chute heat-insulation layers of molten metal contacts not reacted with molten metal to be clean and
Refractory material with heat-insulating property is constituted, and chute shell is used without magnetic metal material；Runner section is strip, template, ellipse
Circle, H types, I-shaped, track type or trapezoidal；When carrying molten metal to be clean using container, then container is barrel-shaped, round for side
Tubular or template, then molten metal now in container is in static without flow regime.
As the further preferred technical scheme of such 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.
As the further preferred technical scheme of such scheme, when above-mentioned for purifying molten metal application by dc source
During DC current, control voltage is adjustable in 0.01-100V, and control electric current intensity is adjustable in the range of 1-100000A；Above-mentioned direct current
Electric current uses frequency for 0.01-10000Hz pulse current, dutycycle 5-100%.
As the further preferred technical scheme of such 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 are produced, or produce using electromagnet the gradient magnetic of steady
；Or gradient magnetic is produced using superconducting magnet, or above-mentioned hybrid mode produces gradient magnetic, magnetic field generator is in magnetic pole
The magnetic induction intensity produced at face is 0.005-45T, and makes magnetic field gradient in 1-2000T2Continuously adjustabe in/m.
As the further preferred technical scheme of such scheme, the field trash filter is by porous ceramic filter
Constitute, 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, substantive distinguishing features and remarkable advantage is obviously protruded with following：
1. the present invention needs dedicated container equipment to remove the process of non-metallic inclusion relative to prior art, the method can
With low cost input and ground simple and easy to apply purifying molten metal；
2. using the method and apparatus of electromagnetism vortex driving force purifying molten metal of the present invention, continuously it can locate online
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
, because molten metal resistance is extremely low equivalent to short circuit, field generator for magnetic is according to the permanent magnet chunk of Non-energy-consumption and its in addition
His magnet, can realize low energy consumption；
4. DC current and gradient magnetic that the present invention applies to molten metal is in the same direction or reversely, what is utilized are direct currents
Stream, which gets around the vertical current component that non-metallic inclusion formed microcell is produced with Actions of Gradient Magnetic Field, to be vortexed, will not be in metal
Form big backflow in liquid, and microcosmic vortex can drive microinclusions to produce millimeter to the movement velocity of 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
Thing is also highly effective.
5. the method and apparatus of the electromagnetism vortex driving force purifying molten metal using the present invention, being capable of continuously convection current
The metal flowed in groove with certain flow rate is purified, especially for continuous casting, by this electromagnetic complex field purifying molten metal
Device apply in casting process between big bag and tundish, or be placed within tundish, can effectively be lifted and finally connected
The cleanliness factor of strand.
Brief description of the drawings
Fig. 1 is the electromagnetism vortex driving force continuous purification molten metal apparatus structure schematic diagram of the preferred embodiment of the present invention one.
Fig. 2 is the mechanism signal that the electromagnetism vortex drive force non-metallic inclusion of the preferred embodiment of the present invention one is migrated
Figure.
Embodiment
Details are as follows for the preferred embodiments of the present invention：
Embodiment one：
In the present embodiment, referring to Fig. 1 and Fig. 2, realize that the electromagnetism vortex driving force that target of the present invention is used is continuously net
Change the device of molten metal, the chute 1 mainly flowed by bearing metal liquid, electrode 3 and 4, water-cooled cable 5, dc source 6, magnetic field
Generator 7 and 11, field trash filter 8, chute heat-insulation layer 9, chute shell 10, poly- slag chute 12 are constituted.The wherein length of chute 1
For 2.5m, the cross sectional dimensions of chute 1 is 90mm (depth) * 180mm (width), and the material of chute heat-insulation layer 10 is poured into a mould using alumine
Material, chute shell 10 uses 316L stainless steels, and the poly- place chute section of slag chute 12 is used as the work for capturing non-metallic inclusion
Region, the poly- outer width of the protrusion chute 1 of slag chute 12 side wall is 70mm, and length and height are matched with electrode 3 and 4, electrode 3 and 4 and stream
Molten metal in groove 1 is directly contacted, and from dc source 6 by water-cooled cable 5 via 3 and 4 molten metal into chute 1 of electrode
DC current is passed through, DC current is vector J, and molten metal of the magnetic field generator 7 and 11 into chute 1 applies the ladder of laterally decay
Magnetic field 15 is spent, field trash filter 8 is as separator to being enriched with the nonmetallic folder moved in poly- slag chute 12 from molten metal
Debris 2 is collected.All poly- slag chutes 12 are arranged on the side of metal spout 1, 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 heat-insulation layer 9 meet not with stream
The requirement that the inner metal liquid of groove 1 reacts and dissolved.Electrode 3 and 4 is used does not occur chemical reaction and molten with the inner metal liquid of chute 1
The inert electrode of solution, in the present embodiment, electrode 3 and 4 are made of high purity graphite, and its size is 300mm (length) * 50mm
(thickness) * 90mm (height), the correspondence installation settings of electrode 3 and 4 is in the left and right sides of the poly- region wall of 12 place chute of slag chute 1, electrode 3
It is connected with 4 output ends respectively with corresponding dc source 6 by water-cooled cable 5, the current density by electrode 3 and 4 is 1
×1010A/m2.In the outside of chute 1 where poly- slag chute 12, a pair of magnetic field generator 7 is set near the position of electrode 3 and 4
With 11, two magnetic field generators 7 and 11 are provided along the horizontal stroke vertical with molten metal main flow direction for 1 section of chute where poly- slag chute 12
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 chunk structure
Into the magnetic induction intensity produced at the magnetic pole strength of the magnetic field generator 7 of poly- slag chute 12 is 1.5T, and magnetic field generator 11
Magnetic pole strength at the magnetic induction intensity that is produced be 0.1T, when molten metal flows in chute 1, unlatching is connected with electrode 3 with 4
Dc source 6,1 section of chute where making poly- slag chute 12 has horizontal DC current J to circulate, at the same time opens magnetic field generator
7 and 11, magnetic field generator 7 and 11 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 the poly- region of slag chute 12, makes to enter what is flowed in poly- 1 section of 12 place chute of slag chute
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 gathered in poly- slag chute 12, is met on the poly- head of slag chute 12 to collected nonmetallic
Field trash 2 to position at field trash filter 8 is set, the material of field trash filter 8 is using alumina base foam pottery
Porcelain filter material, makes migration and gathers the non-metallic inclusion 2 in poly- slag chute 12 finally to be received by field trash filter 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 flows through the chute 1 for being provided with non-metallic inclusion removal device, if
Put the molten metal flowed through inside two groups of non-metallic inclusion removal device convective tanks 1 and apply 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
The aluminium liquid of fine aluminium system 1200 from the higher one end injection of chute 1, the speed of the control chute 1 relatively low aluminium liquid of one end 1200 outflow makes
Flowing velocity of 1200 aluminium liquids in chute 1 is about 0.3m/min in chute, and 1200 aluminium liquids in chute 1 is maintained 60mm's
Depth, changes original direction of motion of the non-metallic inclusion in molten metal using electromagnetic complex field, drives non-metallic inclusion
Migrate, and finally collected by the field trash filter 8 in poly- slag chute 12 in the poly- slag chute 12 set into chute 1.By right
The molten metal of poly- 12 place chute of slag chute, 1 section of flowing applies the gradient magnetic 15 along the horizontal decay of metal spout 1, makes gradient
The magnetic induction intensity peak value in magnetic field 15 is located at the poly- region of slag chute 12, and the molten metal of poly- 12 place chute of slag chute, 1 section of flowing is applied
Plus along the horizontal DC current J of metal spout 1, the molten metal of poly- 12 place chute of slag chute, 1 section of flowing is in DC current J
Under the Electromagnetic heating field action of gradient magnetic 15, because non-metallic inclusion 2 is insulator, now laterally flowed along chute 1
Dynamic DC current J is when running into non-metallic inclusion 2, and DC current J will get around non-metallic inclusion 2, and from nonmetallic folder
Flowed through around debris 2, make non-metallic inclusion 2 front and rear sides formed respectively close to towards the sense of current meet current side S1 and
Close to suitable the current side S2 of the dorsad sense of current, so 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
The vertical current component J formedyInteract, acted around non-metallic inclusion 2 with additional gradient magnetic 15
The Lorentz force F of molten metal, molten metal is circumferentially moved Lorentz force F can be in the molten metal before and after non-metallic inclusion 2
The opposite microcell eddy flow 13 and 14 of both direction is formed, and the center of eddy flow 13 and 14 can produce negative pressure, due to poly- slag chute 12
Side magnetic field intensity is higher, therefore eddy flow 13 is bigger than the intensity of eddy flow 14, causes possess net swirling force, makes non-metallic inclusion
2 are meeting current side S1 because the suction strength that eddy flow is produced is bigger close to the poly- side of slag chute 12, so that non-gold in molten metal
Belong to field trash 2 to migrate to the side where poly- slag chute 12, simultaneously because non-metallic inclusion 2 is original vertical with molten metal in chute 1
To the presence of flowing, and then the non-metallic inclusion 2 entered in poly- slag chute 12 is set to continue along the longitudinal flow of chute 1, and it is final
Collected by the field trash filter 8 for being arranged on the poly- head of slag chute 12, set by total flow direction along molten metal in chute 1
Electromagnetism vortex driving force purifier as multistage is put, carrying out flow 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 last poly- region of slag chute 12, makes the pure of molten metal
Cleanliness reaches purification standard requirement.
Referring to Fig. 1 and Fig. 2, the dc source 6 being connected with two electrodes 3 with 4 is opened, makes 1 section of chute where poly- slag chute 12
There is horizontal DC current J to circulate, adjust dc source 6, the intensity for making DC current J is 2000A.Due to close to poly- slag chute 12
The magnetic induction intensity produced at 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 the poly- region of slag chute 12.Now edge
When the DC current J of the lateral flow of chute 1 runs into non-metallic inclusion 2 in 1200 aluminium liquids, DC current J will get around nonmetallic folder
Debris 2 flows through around it, so meeting current side S1 and will be formed perpendicular to straight along current side S2 in non-metallic inclusion 2
Flow the vertical current component J of the original lateral flows of electric current Jy.Current side S1 is met in non-metallic inclusion 2 and along current side S2 institutes
The vertical current component J of formationyInteract, generation can make before and after non-metallic inclusion 2 with additional gradient magnetic 15
The Lorentz force F that 1200 aluminium liquids are circumferentially moved.Lorentz force F can be formed in 1200 aluminium liquids before and after non-metallic inclusion 2
The eddy flow 13 and 14 that intensity differs, and the center of microcell eddy flow 13 and 14 can produce certain negative pressure.Due to close to poly- slag
The magnetic induction intensity of additional gradient magnetic 15 of the position of groove 12 is bigger, therefore eddy flow 13 is bigger than the intensity of eddy flow 14, that is, anticipates
Taste non-metallic inclusion 2 in the close poly- side of slag chute 12 because the suction strength that eddy flow is produced is bigger, so that 1200 aluminium liquids
Middle non-metallic inclusion 2 is migrated to the side where poly- slag chute 12.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 may proceed to along the longitudinal flow of chute 1, so that most
Collected by the field trash filter 8 for being arranged on the poly- head of slag chute 12 eventually, non-metallic inclusion filter 8 can be as needed
Carry out disassembling, assembling and replacing.In the present embodiment, field trash filter 8 uses ceramic foam filter.From the higher-end of chute 1 in a steady stream
1200 aluminium liquids constantly flowed into are remained after first group of electromagnetic complex field continuous purification metal liquid device purification in 1200 aluminium liquids
Non-metallic inclusion 2 again by the purification of second group of electromagnetic complex field continuous purification metal liquid device, may finally be always
Obtain cleanliness factor very high 1200 aluminium liquids.
The present embodiment molten metal by continuous casting or cast become a useful person before make molten metal with certain speed flow through one be provided with
Molten metal in the chute 1 of two groups of non-metallic inclusion removal devices, convective tank 1 applies 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 set into chute is moved
Move, and finally collected by the field trash filter 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 applied to the various refinery processes high to the requirement of molten metal degree of purity, the molten metal after continuous purification
Directly continuous casting or the ultralow strand of non-metallic inclusion content can be molded into.
Embodiment two：
The present embodiment and embodiment one are essentially identical, are particular in that：
In the present embodiment, the length of chute 1 is 2m, and cross-sectional width is 100mm, is highly 150mm, chute heat-insulation layer 9
Constituted using magnesia-alumina-carbon brick.The size of electrode 3 and 4 is：150mm (depth) * 250mm (width), thickness is 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 assembling seated position spacing 0.7m.Chute 1 is placed between the big bag during 304 stainless steel continuous castings and tundish.Make
304 molten stainless steels in big bag are flowed into from one end of square chute 1, and 304 molten stainless steels after continuous purification are from square stream
The other end of groove 1 is exited into tundish, and 304 molten stainless steel flow velocitys are 0.10 meter per second, by purification in subsequent tundish
304 molten stainless steels enter in continuous cast mold that directly continuous casting goes out 304 stainless steel casting blanks of high-cleanness, high.
In the present embodiment, electrode 3 and 4 is using spraying TiB2The high purity graphite of conductive resistant to corrosion coating.The He of magnetic field generator 7
11 use electromagnet, and the magnetic induction intensity produced at the magnetic pole strength of the magnetic field generator 7 of poly- slag chute 12 is 2T, magnetic field hair
The magnetic field intensity produced at the magnetic pole strength of raw device 11 is 0.05T.The intensity for the DC current J that dc source 6 is applied is
10000A, sufficiently large current strength can ensure effectively to enter non-metallic inclusion 2 with the effect of additional gradient magnetic 15
Row directional migration.Cleanliness factor by 304 molten stainless steels of above-mentioned two sections of electromagnetism vortex driving force continuous purification is greatly improved.
The embodiment of the present invention is illustrated above in conjunction with accompanying drawing, but the invention is not restricted to above-described embodiment, can be with
Made according to the purpose of the innovation and creation of the present invention under a variety of changes, all Spirit Essence and principle according to technical solution of the present invention
Change, modification, replacement, combination, the simplification made, should be equivalent substitute mode, as long as meeting the goal of the invention of the present invention, only
Otherwise technical principle and inventive concept away from electromagnetism vortex driving force continuous purification molten metal method of the present invention, belong to this hair
Bright protection domain.
Claims (10)
1. a kind of method of electromagnetism vortex driving force continuous purification molten metal, it is characterised in that：Set molten metal to be clean
Fixed speed flows through the chute (1) for being provided with multistage non-metallic inclusion removal device, it is characterised in that：The nonmetallic folder set
Debris removal device applies electromagnetic complex field, the vortex produced using electromagnetic complex field to the internal molten metal flowed through of chute (1)
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 set in, and finally collected by the field trash filter (8) in poly- slag chute (12),
The side of metal spout (1) sets the poly- slag chute (12) that at least one protrudes from chute (1) side wall, to where poly- slag chute (12)
The molten metal of chute section flowing applies the gradient magnetic (15) along the horizontal decay of 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
Plus along the horizontal DC current (J) of metal spout (1), where making poly- slag chute (12) in chute (1) section at the molten metal of flowing
Under the Electromagnetic heating field action of DC current (J) and gradient magnetic (15), because non-metallic inclusion (2) is insulator,
Now along the DC current (J) of chute (1) lateral flow when running into non-metallic inclusion (2), DC current (J) will get around non-
Metallic inclusion (2), and flowed through around non-metallic inclusion (2), the front and rear sides of non-metallic inclusion (2) is formed respectively
Current side (S1) and the suitable current side (S2) close to the dorsad sense of current are met close to towards the sense of current, so in nonmetallic folder
Debris (2) meets current side (S1) and will form the vertical current component perpendicular to DC current (J) along current side (S2)
(Jy), in the vertical current component (J for meeting current side (S1) and being formed along current side (S2) of non-metallic inclusiony) with it is additional
Gradient magnetic (15) interacts, and acts the Lorentz force (F) of the molten metal around non-metallic inclusion (2), so that
Drive the molten metal of the front and rear sides of non-metallic inclusion (2) to produce circular motion in opposite direction, molten metal is circumferentially transported
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 the center of microcell eddy flow (13,14) can produce negative pressure, due to close to poly- slag chute (12) region position
Additional gradient magnetic (15) magnetic induction intensity is bigger, then non-metallic inclusion (2) is produced 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
The suction strength produced in eddy flow is bigger, so that non-metallic inclusion (2) is to the side where poly- slag chute (12) in molten metal
Migration, simultaneously because in original (1) with chute of non-metallic inclusion (2) molten metal longitudinal flow presence, and then make to enter
Non-metallic inclusion (2) in poly- slag chute (12) may proceed to along chute (1) longitudinal flow, and finally be arranged on poly- slag chute (12)
The field trash filter (8) on head is collected, is set by total flow direction along molten metal in chute (1) as multistage
Electromagnetic complex field non-metallic inclusion purifier, to flowing through the progress of the molten metal in chute (1) flow, piecewise is continuous step by step
Purification, before molten metal leaves chute (1), when molten metal leaves from last 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 scopes in.
3. the method for electromagnetism vortex driving force continuous purification molten metal according to claim 1, it is characterised in that：By stating
The molten metal of chute (1) purification is the metal bath of aluminium alloy, titanium alloy, copper alloy or steel alloy, or passes through above-mentioned chute
(1) molten metal of purification is high-speed steel, mould steel, high temperature alloy or needs other alloys of high cleanliness metal material, or
For conducting metal, conductive 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 source (6) is that purifying molten metal applies above-mentioned DC current (J), control voltage is adjustable in 0.01-100V, control electric current
Intensity is adjustable in the range of 1-100000A；Above-mentioned DC current (J) uses frequency for 0.01-10000Hz pulse current, accounts for
Sky compares 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,
Main chute (1), poly- slag chute (12), electrode (3,4), water-cooled cable (5), dc source (6), the magnetic flowed by bearing metal liquid
Field generator (7,11), field trash filter (8), chute heat-insulation layer (9) and chute shell (10) composition, wherein poly- slag chute
(12) as the working region of capture non-metallic inclusion (2), electrode (3,4) is directly contacted with the molten metal in chute (1), and
From molten metal input direct-current electric current (J) of the dc source (6) by water-cooled cable (5) via electrode (3,4) into chute (1),
Molten metal of the magnetic field generator (7,11) into chute (1) applies gradient magnetic (15), and field trash filter (8) is used as separation
Device to from molten metal enrichment move to the non-metallic inclusion (2) in poly- slag chute (12) and be collected, all poly- slag chutes (12)
The side of metal spout (1) is arranged on, 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) inwall meets what is do not reacted and dissolve with chute (1) inner metal liquid
It is required that, electrode (3,4) is using the inert electrode plate for not chemically reacting and dissolving with the generation of chute (1) inner metal liquid, a pair of electrodes
(3,4) left and right sides of correspondence installation settings chute (1) region wall where the poly- slag chute (12), electrode (3,4) respectively with it is right
The output end for the dc source (6) answered is connected by water-cooled cable (5), and the current density by electrode (3,4) is 1-1010A/
m2, set corresponding two magnetic field to occur near the position of electrode (3,4) on the outside of the chute (1) where poly- slag chute (12)
Device (7,11), two magnetic field generators (7,11) provide one for chute (1) section where poly- slag chute (12) and laterally declined along chute
The gradient magnetic (15) subtracted, magnetic field gradient (15) is not higher than 2000T2/ m, when molten metal is flowed in the chute (1), open with
The connected dc source (6) of two electrodes (3,4), chute (1) section where making poly- slag chute (12) has horizontal DC current (J) stream
It is logical, magnetic field generator (7,11) is at the same time opened, gradient magnetic (15) is applied to chute (1) section where poly- slag chute (12),
The magnetic induction intensity peak value of gradient magnetic (15) is located at poly- slag chute (12) region, make to enter chute where poly- slag chute (12)
(1) molten metal of flowing is under the Electromagnetic heating field action of DC current (J) and gradient magnetic (15) in section, utilizes electromagnetism
Composite Field makes the non-metallic inclusion (2) flowed with molten metal migrate and gather in poly- slag chute (12), in poly- slag chute
(12) head meet to assembled non-metallic inclusion (2) come to position at set field trash filter (8), make migration and gather
The non-metallic inclusion (2) collected in poly- slag chute (12) is finally collected by field trash filter (8).
6. the device of electromagnetism vortex driving force continuous purification molten metal according to claim 5, it is characterised in that：With electromagnetism
The poly- slag chute (12) of Composite Field sets 1-15 in chute (1), and all poly- slag chute (12) is uniformly arranged on the one of chute (1)
Side, the front and back end spacing of two poly- slag chutes (12) of arbitrary neighborhood is 0.1-1.5m, and multiple poly- slag chutes (12) can be to flowing through chute
(1) molten metal carries out flow 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 set 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) section of molten metal flowing uses square, and sectional area is 10-10000cm2, the stream in chute (1) with molten metal contacts
Groove heat-insulation layer (9) is constituted for the refractory material for not reacted with molten metal to be clean and having heat-insulating property, and chute shell (10) is adopted
With without magnetic metal material；Chute (1) section is strip, template, ellipse, H types, I-shaped, track type or trapezoidal；Work as use
When container carries molten metal to be clean, then container is the barrel-shaped, cylindrical shape in side or template, then the molten metal now in container is in
It is static without flow regime.
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) is produced using Nd-Fe-B permanent magnetic iron block group, samarium-cobalt magnet, magnet steel or poly- magnetic mode,
The gradient magnetic (15) of steady is either produced using electromagnet；Or produce gradient magnetic (15) using superconducting magnet,
Or above-mentioned hybrid mode produces gradient magnetic (15), the magnetic induction intensity that magnetic field generator (7,11) is produced at magnetic pole strength is
0.005-45T, and make magnetic field gradient in 1-2000T2Continuously adjustabe 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 up of porous ceramic filter, is filtered using foamed ceramics, ceramic microtube, Ceramic Balls, ceramic cloth
Device, the ceramic particles filters of bonding or similar Multiple-Aperture Device, and porous ceramic filter can be dismounted more as needed
Change.
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| CN107498001A (en) * | 2017-09-08 | 2017-12-22 | 大连理工大学 | The pouring cup device with electromagnetism purified treatment for magnesium iron mold continuous production |
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| CN113441695A (en) * | 2021-05-24 | 2021-09-28 | 中南大学 | Method for removing non-oriented silicon steel inclusions |
| CN113441695B (en) * | 2021-05-24 | 2022-08-26 | 中南大学 | Method for removing non-oriented silicon steel inclusions |
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