CA1315103C - Furnace for preparing and delivering alloys - Google Patents
Furnace for preparing and delivering alloysInfo
- Publication number
- CA1315103C CA1315103C CA000569138A CA569138A CA1315103C CA 1315103 C CA1315103 C CA 1315103C CA 000569138 A CA000569138 A CA 000569138A CA 569138 A CA569138 A CA 569138A CA 1315103 C CA1315103 C CA 1315103C
- Authority
- CA
- Canada
- Prior art keywords
- molten metal
- furnace
- metal conduit
- conduit
- inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000956 alloy Substances 0.000 title claims abstract description 27
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 60
- 239000002184 metal Substances 0.000 claims abstract description 60
- 238000005192 partition Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000012384 transportation and delivery Methods 0.000 description 12
- 239000000155 melt Substances 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013019 agitation Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000357297 Atypichthys strigatus Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 208000034423 Delivery Diseases 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- LNCFUHAPNTYMJB-IUCAKERBSA-N His-Pro Chemical compound C([C@H](N)C(=O)N1[C@@H](CCC1)C(O)=O)C1=CN=CN1 LNCFUHAPNTYMJB-IUCAKERBSA-N 0.000 description 1
- 241000282619 Hylobates lar Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000551 Silumin Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 108010085325 histidylproline Proteins 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- NQLVQOSNDJXLKG-UHFFFAOYSA-N prosulfocarb Chemical compound CCCN(CCC)C(=O)SCC1=CC=CC=C1 NQLVQOSNDJXLKG-UHFFFAOYSA-N 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
FURNACE FOR PREPARING AND DELIVERING ALLOYS
ABSTRACT
The furnace includes a refractory-lined working chamber enclosed in a jacket, heating means arranged under the dome of the furnace, a conduit for delivering the molten metal and an inductor of a travelling magnetic field, arranged externally of the working chamber.
The molten metal conduit is made of two runs, the lower and upper ones, extending at an obtuse angle to each other.
A partition overlies the upper run of the molten metal conduit.
The inductor is made of two sections underlying, respecti-vely, the lower and upper runs of the molten metal conduit.
ABSTRACT
The furnace includes a refractory-lined working chamber enclosed in a jacket, heating means arranged under the dome of the furnace, a conduit for delivering the molten metal and an inductor of a travelling magnetic field, arranged externally of the working chamber.
The molten metal conduit is made of two runs, the lower and upper ones, extending at an obtuse angle to each other.
A partition overlies the upper run of the molten metal conduit.
The inductor is made of two sections underlying, respecti-vely, the lower and upper runs of the molten metal conduit.
Description
~315103 FURNACE FOR PREPARI~G AND DELIVERI~G ALLOYS
The invention relates to non-ferrous and ~errous metal~
lur~y, and more particularly it relates to a furnace for pre-paring and delivering alloys of required compositions.
Field of Application ~ he present invention can be utilized to the utmost effect in production of aluminium and its alloys, for preparing an alloy o~ a required composition with the use of electric or gas-fired ~urnaces o~ the reverberatory type, where electro-magnetic action of magnetic fields onto a conducting medium is employed.
~ he invention can be used also in production o~ alloys of copper, zink, magnesium, lead, iron and other metals.
Summary o~ the Prior Art The ever-growing requirement 9 put before the quality of articles made of metal alloys are reflected in the ever-stricter demands on the accuracy o~ the composition o~ an alloy and its minimizsd content o~ unwanted impurities (e.g. oxides), to say nothi~g of the ability of quic~ly introducing into the alloy the modifying and allo~ing additiYes for intense interac-tio~ with the base metal of the alloy, e.g. for raising the maximum temperature in the process of preparing the alloy, for prolonging the service life o~ articles made therefrom, ~or obtaini~g the alloy with required properties. On the other hand, a significant rate of melting losses in the process o~
preparing an alloy and the pre~ence o~ oxide inclusions in ~inal articles tend to step up the percentage of rejects.
Furthermore, the equipment generally used nowadays i8 not sufficiently reliable, which manifests itself in considerable !
downtime taken by maintenance and repair jobs, which affects the productivity of preparing alloys.
There is known a furnace for preparing and delivering molten metals (DE, A, 1286701), particularly aluminium, compri-sinæ a sin~le-sided inductor of a travelling magnetic field, providing for contactless variable dispensing of the melt from the furnace. A drawback of this known furnace is its narro~v field of applicability solely for electromagnetic deli~er~ of the molten metal; moreover, the furnace i~ not adequately ef-ficient on accou~t of the process of preparing the product in-volving prolonged residence of the alloy in the furnace.
There is further known a furnace for preparing and deli-vering alloys (CA, A, 1085613), comprisi~g a refractory-lined working chamber enclosed in a metal ~ac~et, heater~ arra~ged under the dome of t~e ~urnac~, ~n i~clined metal conduit for delivering the molten metal arranged in the bottom part of the working chamber, and an inductor of a travelling magn~tic field arranged externally of the working chamber along the metal conduit. A partition is mounted above the metal conduit in the working chamber, longitudinally of the conduit. One wall of the chamber, adjoining the inductor, is made slanting, of a non-magnetic material. ~he furnace i9 operable in two modes:
the mode of agitating the molten metal in the furnace and the mode of delivering the molten metal from the fur~ace.
In operatio~ of the inductor in the agitation mode, the direction of the travelling magnetic field i9 oriented from the delivery outlet to the central zone of the furnace, the 131~103 operation ensuring that the temperature differential between-the surface layers of the molten me~al and the bottom of the furnace is reduced from 150C to some 10~C. When the direction oP the travelling magnetic wave is switched over to that from the central zone of the furnace towards the delivery outlet, the furnace operates in the alloy delivery mode.
A drawback o~ this furnace of the prior art is that when it i9 operated in the delivery mode, considerable turbulence of the ~low of the alloy in the delivery conduit, accompanied by bubbling, results in breaking the continuity o~ the surface ~ilm, thus promoting oxidation of the alloy. Consequently, when the furnace is operated in the delivery mode, the ingots obtained are of relatively poor quality on aocount o~ a high content of impurities in the form of oxides, oxide films and other inclusions.
Object~ and Summary of the Invention It is an object of the present invention to enhance the quality of molten metals an~ alloys.
It is another object of the present invention to increase the throughput of the furnace in the delivery mode.
It is yet another object of the present invention to se-parate the zones of agitation of the molten metal and its del-ivery from the furnace.
It is still another object of the present invention to reduce t~e losses of metal in the ~urnace.
It is also an object of the present invention to reduce the i~put of electric power into the maintaining of the required melt temperature in the furnace.
131~103 These and other objects of the invention are attained in a furnace for preparing and delivering alloys,comprising a reEractory-lined working chamber enclosed in a j~cket, heaters arranged under the dome of the furnaco, an inclined molt~n metal conduit for delivering the molten ~ tal, arranged in the bottom part of the working chamber, a partition over-lying in a spaced relationship the molten metal conduit and extending longitudinally thereof, and an inductor of a travelling magnetic field arranged externally of the wor~ing ch~mber along the molten metal conduit, in which furnace, in accordance with the present invention, the molten metal conduit is made of two runs, the lower and upper ones, extending at an obtuse angle to each other, with the partition overlying the upper run of the molten metal conduit, and the inductor being made of two sections arra~ged, respectively, under the lower and upper runs of the molten metal conduit.
Thus, the present invention provides ~or separating the functions of agitating and delivering the molten metal or alloy.
~his is attained by having the molten metal conduit made of two runs overlying the respective sections of the externally ar-ranged inductor, selectively energized to correspond to the required operating mode.
~ urthermore, thls also provides for substantially reducing the input of electric power, as only one section of the inductor is energized in either mode.
The invention further provides for enhancing the qualit~
of final articles by reducing the content of oxide inclusions.
13~5103 Moreover, as the breaking of the continuity of the pro-~
tecting surface film is avoided, the lo~s of the metal or alloy is reduced.
An additional advantage of the present invention is that it provides for upgrading the accuracy of the metering out of the melt being dispensed, owing to elimination of the bubbling of the melt being delivered by the ~urnace.
In a preferred embodiment o~ the invention, the lower part o~ the partition extends at an angle to the upper run of the molten metal conduit, so that the gap therebetween ~lares out towa~ds the lower run of the conduit.
~ his pro~ides for enhancing the efficiency of the furnace in the delivery mode by more complete utilization of the energy of the molten metal stream.
Moreover, with the lower part of the partition being at an angle to the upper run o~ the metal conduit, the flow of the melt in the delivery mode becomes more laminar.
It is expedient that the angle of the inclination of the lower part of the partition with respect to the upper arm of the molten metal conduit should be within 5-10. With the angle selected within this range, the hydraulic resistance in the molten metal conduit is minimized.
According to one embodiment of the invention, the metal ja¢ket of the ~urnace in the area of the molten metal conduit is made of two electrically insulated liquid-cooled radiators of a non-magnetic material, one radiator being received within the other one, with the plates o~ the two radiators alternating and the two radiators defining a solid structure.
1 31 5~03 This desi~n feature of the furnace enhances its reliabi~ity b~ pr~cluding the leak~ of the molten metal from the furnace.
Furthermore, this feature prolongs the service life of the ref-ractory lining o~ the furnace in the zone of action of the in~uctor, and, hence, the service life of the furnace, as a whole. Moreover, this design feature prolongs interval~ between routine maintenance periods of the ~urnace.
Summary of the Drawings Other objects and advantages of the present invention will be made apparent in the following description of its embodi-ment, with reference being made to the accompanying drawings, wherein:
FIG. 1 schematically illustrates a furna¢e embodying the in~ention;
FIG. 2 shows in more detail a sectional view taken along line II-II of FIG. 1;
FIG. 3 shows in even more detail a sectional view taken along line III-III of FIG. 2.
Detailed Description of the Embodiment The furnace for preparing and delivering alloys ¢omprises a worki~g ohamber 1 (FIG. 1) enclosed in a metal jacket 2 with an internal re~ractory lining 3. ~eatere 4 are mounted under the dome of the ~urnace, and its bottom part accommodates a molten metal conduit 5 mado up of two xuns, i.e. a lower run 6 and an upper run 7, extending at an obtuse angle ~ to each other. Overlying the upper run 7 of the molten metal condu$t 5 in a spa¢ed relationship is a partition 8 extending along the 1315~3 metal conduit 5, its lower part being inclined with respect ~-to the upper arm 7 of the metal conduit 5 at an angle ~ =5-10, defining with the upper arm 7 a gap flaring toward the lower run 6 of the metal conduit 5. ~ounted externally o~ the working chamber 1 along the molten metal conduit 5 is an inductor 9 adapted to produce a travelling mag~etic field. The inductor 9 is in the form of two independe~t sections 10, 11 underlying, respectively, the lower run 6 and the upper run 7 of the molten metal conduit 5.
In the embodiment being described, the Jacket 2 in the area of the metal conduit 5 is made of two liquid cooled ra-diators 12, 13 (~IGS 2 and 3) of a non-magnetic material, which are electrically insulated and received one within the other, with the respective plates 14, 15 of the radiators 12, 13 al-ternating, defi~ing a solid structure. The radiators 12 and 13 are provided with ducts 16, 17 for the flow o~ a liquid coolant, e.g. water.
The furnace has an inlet port 18 (FIG. 1) and an outlet port 19.
The disclosed furnace is operated, as ~ollows.
With either a meltable charge or molten metal 20 from an electrolyzer (not shown) introduced into the furnace through lts inlet port 18 to fill the working chamber 1, and with the heaters 4 energiz~d, the melting process is started, and the section 10 of the inductor 9 is also energized to produce a magnetic field travelling from the inlet port 18 towards the centre of the chamber 1. The molten metal 20 i9 thus agitated 131~103 in the chamber 1, circulating vertically as inàicated by an arrow line A in FIG. 1.
~ he agication levels out the temperature o~ the molten metal 20 and homogenizes the composition o~ the melt throughout its entire volume in the working chamber 1.
With the required melt prepared, the inductor 9 is operated to reverse the magnetic field produced by the section 10, and to energize the section 11 thereof. ~he travel of the ma~netic field produced bJ the section 11 of the inductor 9 is directed ~rom the centre of the working chamber 1 towards its outiet port 10, thus adding iGself to the travel induced by the switched--over section 10 of the inductor 9.
In this delivery mode, the molten metal ~lows along the metal condlit 5 between the refractory lining 3 and partition 8, which prevents any mixi~g of the melt being delivered with the sur~ace oxide film, thus enhancing the quality of the dispensed metal. The molten metal is delivered via the outlet port 19 in a uniform ~low, free ~rom oxides.
Example 1 In a furnace operated for produci~g a sil~con-aluminium alloy o~ the Silumin t~pe, the partition 8 is made o~ a refrac-tory material, e.g. corundum. The width of the molten metal conduit 5 equals the width of the inductor 9.
Molten aluminium is poured from the associated electrolyzer (not shown3 into the ~urnace, and silicon is charged into the working chamber 1 via the inlet port 18. The heaters 4 are ener-gized, and the section 10 o~ the inductor 9 is also energized in the a~itation direction. With the sil~con dissolved, the ~
agitation results in the final alloy being prepared for delivery in about 15 minutes following the energization of the sec-tion 10 of the inductor 9. ~hen the section 11 of the inductor 9 is also energized, the current direction on the section 10 i9 reversed, a~d the value of the current in the section 11 is infinitely controlled to dispense the ready alloy from the furnace into a continuous casting plant.
Example 2 Aluminium char~e is introduced into the working chamber 1 of the ~urnace via the inlet port 18, and the heaters 4 are ener-gized. With the aluminium having melted, copp ~ charge is fed i~to the ~urnace to produce an alloy containing 4-5% copper and aluminium the rest. ~he section 10 of the inductor 9 i9 energized at the very moment of starti~g -the melting operation, its action speeding up the melting, and then agitating and homogenizing the melt. Depending on the power rating of the furnace, the operation of preparing the melt takes from 0.5 to 1.0 hour. With the melt prepared, it is delivered as described above in Example 1.
The invention relates to non-ferrous and ~errous metal~
lur~y, and more particularly it relates to a furnace for pre-paring and delivering alloys of required compositions.
Field of Application ~ he present invention can be utilized to the utmost effect in production of aluminium and its alloys, for preparing an alloy o~ a required composition with the use of electric or gas-fired ~urnaces o~ the reverberatory type, where electro-magnetic action of magnetic fields onto a conducting medium is employed.
~ he invention can be used also in production o~ alloys of copper, zink, magnesium, lead, iron and other metals.
Summary o~ the Prior Art The ever-growing requirement 9 put before the quality of articles made of metal alloys are reflected in the ever-stricter demands on the accuracy o~ the composition o~ an alloy and its minimizsd content o~ unwanted impurities (e.g. oxides), to say nothi~g of the ability of quic~ly introducing into the alloy the modifying and allo~ing additiYes for intense interac-tio~ with the base metal of the alloy, e.g. for raising the maximum temperature in the process of preparing the alloy, for prolonging the service life o~ articles made therefrom, ~or obtaini~g the alloy with required properties. On the other hand, a significant rate of melting losses in the process o~
preparing an alloy and the pre~ence o~ oxide inclusions in ~inal articles tend to step up the percentage of rejects.
Furthermore, the equipment generally used nowadays i8 not sufficiently reliable, which manifests itself in considerable !
downtime taken by maintenance and repair jobs, which affects the productivity of preparing alloys.
There is known a furnace for preparing and delivering molten metals (DE, A, 1286701), particularly aluminium, compri-sinæ a sin~le-sided inductor of a travelling magnetic field, providing for contactless variable dispensing of the melt from the furnace. A drawback of this known furnace is its narro~v field of applicability solely for electromagnetic deli~er~ of the molten metal; moreover, the furnace i~ not adequately ef-ficient on accou~t of the process of preparing the product in-volving prolonged residence of the alloy in the furnace.
There is further known a furnace for preparing and deli-vering alloys (CA, A, 1085613), comprisi~g a refractory-lined working chamber enclosed in a metal ~ac~et, heater~ arra~ged under the dome of t~e ~urnac~, ~n i~clined metal conduit for delivering the molten metal arranged in the bottom part of the working chamber, and an inductor of a travelling magn~tic field arranged externally of the working chamber along the metal conduit. A partition is mounted above the metal conduit in the working chamber, longitudinally of the conduit. One wall of the chamber, adjoining the inductor, is made slanting, of a non-magnetic material. ~he furnace i9 operable in two modes:
the mode of agitating the molten metal in the furnace and the mode of delivering the molten metal from the fur~ace.
In operatio~ of the inductor in the agitation mode, the direction of the travelling magnetic field i9 oriented from the delivery outlet to the central zone of the furnace, the 131~103 operation ensuring that the temperature differential between-the surface layers of the molten me~al and the bottom of the furnace is reduced from 150C to some 10~C. When the direction oP the travelling magnetic wave is switched over to that from the central zone of the furnace towards the delivery outlet, the furnace operates in the alloy delivery mode.
A drawback o~ this furnace of the prior art is that when it i9 operated in the delivery mode, considerable turbulence of the ~low of the alloy in the delivery conduit, accompanied by bubbling, results in breaking the continuity o~ the surface ~ilm, thus promoting oxidation of the alloy. Consequently, when the furnace is operated in the delivery mode, the ingots obtained are of relatively poor quality on aocount o~ a high content of impurities in the form of oxides, oxide films and other inclusions.
Object~ and Summary of the Invention It is an object of the present invention to enhance the quality of molten metals an~ alloys.
It is another object of the present invention to increase the throughput of the furnace in the delivery mode.
It is yet another object of the present invention to se-parate the zones of agitation of the molten metal and its del-ivery from the furnace.
It is still another object of the present invention to reduce t~e losses of metal in the ~urnace.
It is also an object of the present invention to reduce the i~put of electric power into the maintaining of the required melt temperature in the furnace.
131~103 These and other objects of the invention are attained in a furnace for preparing and delivering alloys,comprising a reEractory-lined working chamber enclosed in a j~cket, heaters arranged under the dome of the furnaco, an inclined molt~n metal conduit for delivering the molten ~ tal, arranged in the bottom part of the working chamber, a partition over-lying in a spaced relationship the molten metal conduit and extending longitudinally thereof, and an inductor of a travelling magnetic field arranged externally of the wor~ing ch~mber along the molten metal conduit, in which furnace, in accordance with the present invention, the molten metal conduit is made of two runs, the lower and upper ones, extending at an obtuse angle to each other, with the partition overlying the upper run of the molten metal conduit, and the inductor being made of two sections arra~ged, respectively, under the lower and upper runs of the molten metal conduit.
Thus, the present invention provides ~or separating the functions of agitating and delivering the molten metal or alloy.
~his is attained by having the molten metal conduit made of two runs overlying the respective sections of the externally ar-ranged inductor, selectively energized to correspond to the required operating mode.
~ urthermore, thls also provides for substantially reducing the input of electric power, as only one section of the inductor is energized in either mode.
The invention further provides for enhancing the qualit~
of final articles by reducing the content of oxide inclusions.
13~5103 Moreover, as the breaking of the continuity of the pro-~
tecting surface film is avoided, the lo~s of the metal or alloy is reduced.
An additional advantage of the present invention is that it provides for upgrading the accuracy of the metering out of the melt being dispensed, owing to elimination of the bubbling of the melt being delivered by the ~urnace.
In a preferred embodiment o~ the invention, the lower part o~ the partition extends at an angle to the upper run of the molten metal conduit, so that the gap therebetween ~lares out towa~ds the lower run of the conduit.
~ his pro~ides for enhancing the efficiency of the furnace in the delivery mode by more complete utilization of the energy of the molten metal stream.
Moreover, with the lower part of the partition being at an angle to the upper run o~ the metal conduit, the flow of the melt in the delivery mode becomes more laminar.
It is expedient that the angle of the inclination of the lower part of the partition with respect to the upper arm of the molten metal conduit should be within 5-10. With the angle selected within this range, the hydraulic resistance in the molten metal conduit is minimized.
According to one embodiment of the invention, the metal ja¢ket of the ~urnace in the area of the molten metal conduit is made of two electrically insulated liquid-cooled radiators of a non-magnetic material, one radiator being received within the other one, with the plates o~ the two radiators alternating and the two radiators defining a solid structure.
1 31 5~03 This desi~n feature of the furnace enhances its reliabi~ity b~ pr~cluding the leak~ of the molten metal from the furnace.
Furthermore, this feature prolongs the service life of the ref-ractory lining o~ the furnace in the zone of action of the in~uctor, and, hence, the service life of the furnace, as a whole. Moreover, this design feature prolongs interval~ between routine maintenance periods of the ~urnace.
Summary of the Drawings Other objects and advantages of the present invention will be made apparent in the following description of its embodi-ment, with reference being made to the accompanying drawings, wherein:
FIG. 1 schematically illustrates a furna¢e embodying the in~ention;
FIG. 2 shows in more detail a sectional view taken along line II-II of FIG. 1;
FIG. 3 shows in even more detail a sectional view taken along line III-III of FIG. 2.
Detailed Description of the Embodiment The furnace for preparing and delivering alloys ¢omprises a worki~g ohamber 1 (FIG. 1) enclosed in a metal jacket 2 with an internal re~ractory lining 3. ~eatere 4 are mounted under the dome of the ~urnace, and its bottom part accommodates a molten metal conduit 5 mado up of two xuns, i.e. a lower run 6 and an upper run 7, extending at an obtuse angle ~ to each other. Overlying the upper run 7 of the molten metal condu$t 5 in a spa¢ed relationship is a partition 8 extending along the 1315~3 metal conduit 5, its lower part being inclined with respect ~-to the upper arm 7 of the metal conduit 5 at an angle ~ =5-10, defining with the upper arm 7 a gap flaring toward the lower run 6 of the metal conduit 5. ~ounted externally o~ the working chamber 1 along the molten metal conduit 5 is an inductor 9 adapted to produce a travelling mag~etic field. The inductor 9 is in the form of two independe~t sections 10, 11 underlying, respectively, the lower run 6 and the upper run 7 of the molten metal conduit 5.
In the embodiment being described, the Jacket 2 in the area of the metal conduit 5 is made of two liquid cooled ra-diators 12, 13 (~IGS 2 and 3) of a non-magnetic material, which are electrically insulated and received one within the other, with the respective plates 14, 15 of the radiators 12, 13 al-ternating, defi~ing a solid structure. The radiators 12 and 13 are provided with ducts 16, 17 for the flow o~ a liquid coolant, e.g. water.
The furnace has an inlet port 18 (FIG. 1) and an outlet port 19.
The disclosed furnace is operated, as ~ollows.
With either a meltable charge or molten metal 20 from an electrolyzer (not shown) introduced into the furnace through lts inlet port 18 to fill the working chamber 1, and with the heaters 4 energiz~d, the melting process is started, and the section 10 of the inductor 9 is also energized to produce a magnetic field travelling from the inlet port 18 towards the centre of the chamber 1. The molten metal 20 i9 thus agitated 131~103 in the chamber 1, circulating vertically as inàicated by an arrow line A in FIG. 1.
~ he agication levels out the temperature o~ the molten metal 20 and homogenizes the composition o~ the melt throughout its entire volume in the working chamber 1.
With the required melt prepared, the inductor 9 is operated to reverse the magnetic field produced by the section 10, and to energize the section 11 thereof. ~he travel of the ma~netic field produced bJ the section 11 of the inductor 9 is directed ~rom the centre of the working chamber 1 towards its outiet port 10, thus adding iGself to the travel induced by the switched--over section 10 of the inductor 9.
In this delivery mode, the molten metal ~lows along the metal condlit 5 between the refractory lining 3 and partition 8, which prevents any mixi~g of the melt being delivered with the sur~ace oxide film, thus enhancing the quality of the dispensed metal. The molten metal is delivered via the outlet port 19 in a uniform ~low, free ~rom oxides.
Example 1 In a furnace operated for produci~g a sil~con-aluminium alloy o~ the Silumin t~pe, the partition 8 is made o~ a refrac-tory material, e.g. corundum. The width of the molten metal conduit 5 equals the width of the inductor 9.
Molten aluminium is poured from the associated electrolyzer (not shown3 into the ~urnace, and silicon is charged into the working chamber 1 via the inlet port 18. The heaters 4 are ener-gized, and the section 10 o~ the inductor 9 is also energized in the a~itation direction. With the sil~con dissolved, the ~
agitation results in the final alloy being prepared for delivery in about 15 minutes following the energization of the sec-tion 10 of the inductor 9. ~hen the section 11 of the inductor 9 is also energized, the current direction on the section 10 i9 reversed, a~d the value of the current in the section 11 is infinitely controlled to dispense the ready alloy from the furnace into a continuous casting plant.
Example 2 Aluminium char~e is introduced into the working chamber 1 of the ~urnace via the inlet port 18, and the heaters 4 are ener-gized. With the aluminium having melted, copp ~ charge is fed i~to the ~urnace to produce an alloy containing 4-5% copper and aluminium the rest. ~he section 10 of the inductor 9 i9 energized at the very moment of starti~g -the melting operation, its action speeding up the melting, and then agitating and homogenizing the melt. Depending on the power rating of the furnace, the operation of preparing the melt takes from 0.5 to 1.0 hour. With the melt prepared, it is delivered as described above in Example 1.
Claims (4)
1. A furnace for preparing and delivering alloys, compri-sing:
a refractory-lined working chamber enclosed in a jacket;
heating means accommodated under the dome of said furnace;
an inclined conduit for delivering molten metal, arranged in the bottom part of said working chamber;
said molten metal conduit being made of two runs of which one is the lower run and the other one is the upper run, exten-ding at an obtuse angle relative to each other;
a partition overlying in spaced relationship said upper run of said molten metal conduit, extending longitudinally there-along;
an inductor of a travelling magnetic field, arranged exter-nally of said working chamber, said inductor being made of two sections underlying, respectively, said lower run and said upper run of said molten metal conduit.
a refractory-lined working chamber enclosed in a jacket;
heating means accommodated under the dome of said furnace;
an inclined conduit for delivering molten metal, arranged in the bottom part of said working chamber;
said molten metal conduit being made of two runs of which one is the lower run and the other one is the upper run, exten-ding at an obtuse angle relative to each other;
a partition overlying in spaced relationship said upper run of said molten metal conduit, extending longitudinally there-along;
an inductor of a travelling magnetic field, arranged exter-nally of said working chamber, said inductor being made of two sections underlying, respectively, said lower run and said upper run of said molten metal conduit.
2. A furnace of claim 1, wherein the lower part of said partition extends at an angle with respect to said upper run of said molten metal conduit, defining therewith a gap flaring towards said lower run of said molten metal conduit.
3. A furnace of claim 2, wherein said angle of inclination of the lower part of said partition with respect to said upper run of said molten metal conduit is within a range from 5° to 100.
4. A furnace of claim 1, wherein said jacket in the area of said molten metal conduit is made of two electrically insulated liquid cooled radiators of a non-magnetic material, received one within the other, the respective plates of said radiators alternating to define a solid structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000569138A CA1315103C (en) | 1988-06-10 | 1988-06-10 | Furnace for preparing and delivering alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000569138A CA1315103C (en) | 1988-06-10 | 1988-06-10 | Furnace for preparing and delivering alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1315103C true CA1315103C (en) | 1993-03-30 |
Family
ID=4138172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000569138A Expired - Fee Related CA1315103C (en) | 1988-06-10 | 1988-06-10 | Furnace for preparing and delivering alloys |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1315103C (en) |
-
1988
- 1988-06-10 CA CA000569138A patent/CA1315103C/en not_active Expired - Fee Related
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