WO2019178122A1 - Appareil d'immersion de ferraille métallique fondue - Google Patents

Appareil d'immersion de ferraille métallique fondue Download PDF

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Publication number
WO2019178122A1
WO2019178122A1 PCT/US2019/021886 US2019021886W WO2019178122A1 WO 2019178122 A1 WO2019178122 A1 WO 2019178122A1 US 2019021886 W US2019021886 W US 2019021886W WO 2019178122 A1 WO2019178122 A1 WO 2019178122A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
well
scrap
scrap submergence
diverter
Prior art date
Application number
PCT/US2019/021886
Other languages
English (en)
Inventor
Richard S. Henderson
Jason Tetkoskie
Chris T. Vild
Edward Shilling
Original Assignee
Pyrotek, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US15/921,047 external-priority patent/US10731922B2/en
Application filed by Pyrotek, Inc. filed Critical Pyrotek, Inc.
Priority to KR1020207029156A priority Critical patent/KR102709302B1/ko
Priority to CA3090845A priority patent/CA3090845A1/fr
Priority to MX2020008538A priority patent/MX2020008538A/es
Priority to CN201980018775.2A priority patent/CN111868465B/zh
Priority to JP2020548679A priority patent/JP7431167B2/ja
Priority to EP19766667.0A priority patent/EP3743663A4/fr
Priority to BR112020016390-2A priority patent/BR112020016390B1/pt
Publication of WO2019178122A1 publication Critical patent/WO2019178122A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0025—Charging or loading melting furnaces with material in the solid state
    • 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
    • C22B21/00—Obtaining aluminium
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor
    • 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
    • C22B9/16—Remelting metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • F27B3/16—Walls; Roofs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/18—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • This invention relates to an improved method and apparatus for melting metal scrap such as aluminum.
  • metal scrap such as aluminum.
  • this disclosure is not limited to use with aluminum, but rather, is relevant to all molten metals.
  • Aluminum scrap can be divided into two general categories.
  • the first category of scrap is comprised of large parts such as internal combustion engine parts which are generally self-submerging.
  • the second category of scrap is termed lightweight scrap such as shredded food and beverage containers or machining chips and filings.
  • the lightweight scrap is difficult to submerge and thus is difficult to melt.
  • U.S. Pat. No. 4,128,415 discloses a system for melting metal scrap in a molten media which includes a housing generally cylindrical in cross section and having upper and lower portions. Metal scrap is introduced to a body of molten melting media contained in the upper portion of the housing. A supply of molten melting media is added to the upper portion of the housing through a volute located in the lower portion. The molten melting media is supplied or added by action of an impeller located in the lower portion and mounted on a drive shaft extending through the upper portion. Vanes are mounted on the drive shaft to control the flow motion of the body of molten melting media and metal scrap in the upper portion of the housing by creating a vortex in this body for purposes of mixing the molten melting media and the metal scrap.
  • U.S. Pat. No. 3,997,336 discloses a system for melting metal scrap in a molten melting media which comprises a housing having an upper portion wherein the melting media and scrap are brought together to initiate melting.
  • the housing also has a lower portion in which a volute is located.
  • An impeller having a central hub, a circumferential band surrounding the hub, and canted vanes projecting radially from the hub to the band, is positioned in the lower portion of the housing to cooperate with the volute so that upon rotation of the impeller, metal scrap and melting media are moved downwardly and out of the housing.
  • U.S. Pat. No. 4,518,424 discloses a method of melting metal scrap in a molten melting media.
  • the method comprises the steps of providing a body of molten melting media in a housing having an upper portion and a lower portion, the lower portion having a generally cylindrical wall section.
  • a supply of metal scrap is added to the housing and a supply of molten melting media is introduced to the upper portion of the housing.
  • Melting of the metal scrap is initiated by ingesting it and directing the molten melting media downwardly in the housing by action of an impeller positioned in the lower portion, the impeller having a flat ring member having an opening in the center thereof and having blades extending from said ring member to a substantially circular disc member.
  • U.S. Pat. No. 4,486,228 discloses a method of melting metal scrap in a molten melting media.
  • the method comprises the steps of providing a body of molten melting media in a housing having an upper portion and a lower portion, the lower portion having a generally cylindrical wall section.
  • a supply of metal scrap is added to the housing and a supply of molten melting media is introduced to the upper portion of the housing.
  • Melting of the metal scrap is initiated by ingesting it and molten melting media downwardly in the housing by action of an impeller positioned in the lower portion, the impeller having a flat ring member having an opening in the center thereof and having blades extending from said ring member to a substantially circular disc member.
  • the scrap and melting media enters the opening in the ring member in an axial direction and is propelled therefrom in a radial direction by use of the blades.
  • the impeller is positioned in the cylindrical wall section such that at least the ring member cooperates therewith to move the scrap and melting media from the upper portion through said impeller while substantially avoiding recirculation of the molten melting media within the housing to the upper portion.
  • U.S. Pat. No. 4,437,650 discloses an apparatus for melting relatively large floating units of metal scrap in a molten melting media or medium, the units having oxide films and solid, liquid and gaseous inclusions. After the units are charged into a melting medium, layers of freshly melted metal are presented to the molten media.
  • the apparatus includes a bay for heating the molten media and means for pumping the media from the heating bay to a circular bay for receiving the large units of metal scrap.
  • U.S. Pat. No. 4,286,985 discloses a vortex melting system for ingesting and melting metal scrap that otherwise tends to float on the surface of a molten melting media.
  • the method includes the steps of providing a supply of the melting media and directing the media from the supply to an upper portion of a receptacle having an outlet opening in the lower portion thereof.
  • the flow of the melting media entering the receptacle produces a vortex of the media in the receptacle, as the media flows out the lower opening.
  • the amount of the flow of the melting media to the receptacle and the size of the lower opening are such that a predetermined level of the media is maintained in the receptacle.
  • a metal scrap submergence device includes an open top chamber having walls of a heat resistant material, an inlet positioned in a base or side wall of the chamber, an outlet positioned in the base or side wall of the chamber, and a ramp adjacent the side wall of the chamber.
  • the side wall further includes a removable vane including a hook element suitable for engaging a top edge of the chamber.
  • a molten metal scrap submergence system includes a vortexing scrap submergence well.
  • the vortexing scrap submergence well includes a diverter overlying an outlet.
  • the diverter can be a cylindrical body defining a hollow interior with a plurality of passages being formed in the body and communicating with the hollow interior.
  • the hollow interior can be in fluid communication with the outlet of the vortexing scrap submergence well.
  • a molten metal scrap submergence system includes a vortexing scrap submergence well.
  • the vortexing scrap submergence well includes a diverter overlying an outlet of the vortexing scrap submergence well.
  • the diverter is suspended by a suspension assembly.
  • the suspension assembly includes an arm having a first end for attachment to a location outside the scrap submergence well and a second end receiving a first end of a post. A second end of the post is attached to the diverter.
  • FIGURE 1 is a schematic representation of a traditional molten metal recycling furnace
  • FIGURE 2 is a cross-sectional view of a traditional pump well and charge well of the furnace of Figure 1 ;
  • FIGURE 3 is a top plan view, partially in cross-section of a first embodiment of an inventive charge well
  • FIGURE 4 is a cross-sectional view of the charge well of Figure 3;
  • FIGURE 5 is a cross-sectional view of an alternative embodiment of the inventive charge well;
  • FIGURE 6 is a cross-sectional view of an further alternative embodiment of the inventive charge well
  • FIGURE 7 is a cross-sectional view of a fourth alternative embodiment of the inventive charge well.
  • FIGURE 8 is a cross-sectional view of a fifth alternative embodiment of the inventive charge well
  • FIGURE 9 is a cross-sectional view of a sixth alternative embodiment of the inventive charge well.
  • FIGURE 10 is a top plan view of the charge well of Figure 9;
  • FIGURE 11 is a cross-sectional view of a further alternative embodiment wherein the shape of the charge wall is modified
  • FIGURE 12 is a perspective view of an alternative vane inclusive charge well configuration
  • FIGURE 13 is an alternative charge well embodiment including a diverter element shown in phantom inserted within the outlet of the charge well;
  • FIGURE 14 is a perspective view of the diverter element of Figure 13;
  • FIGURE 15 is a perspective view of a diverter positioning arm in association with a charge well
  • FIGURE 16 is a perspective view of the diverter with post.
  • FIGURE 17 is a side view of the diverter of FIG. 16 in cross-section.
  • the present invention is directed to a scrap submergence system of the type typically employed in metal recycling processes, such as, the recycling of aluminum. In the recycling of metals, it is necessary to melt scrap pieces for treatment and processing. A large portion of aluminum scrap pieces are thin walled as a result of the mechanical shaping action from which they are formed, such as, shaving, boring and cold rolling.
  • a melting furnace In a typical melting operation used to convert lightweight scrap to ingot, a melting furnace is provided with an enclosed hearth and a connected open sidewell. Usually the sidewell is divided into a pump well and a melting bay. A pump or other molten metal flow inducing apparatus is positioned externally to the melting bay (e.g,, in the pump well), and causes molten metal to flow from the hearth to the melting bay. Typically the melting bay is further divided into a charge well and a drosswell. Metal scrap pieces are fed into the melting bay, particularly the charge well component thereof. Floating dross is skimmed from the surface of the molten metal in the dross well.
  • Furnace 10 includes a main hearth component 12 which is heated, for example, with gas or oil burners or by any other means known in the art. Adjacent, and in fluid communication (typically submerged archways) with the hearth 12, is the primary recycling area comprised of a pump well 14, a charge well 16 and a dross well 18. Although not shown, the wall of hearth 12 opens to the pump well 14, the pump well opens to the charge well 16, the charge well opens to the dross well 18, and the dross well opens to the hearth 12 to allow the circulation pattern shown by the arrows.
  • the pump well can include a molten metal pump of any type known to those skilled in the art.
  • the well and pump can be replaced by an electromagnetic pump, for example.
  • the molten metal pump circulates molten metal from the hearth 12 to the charge well 16 where scrap chips of the metal to be recycled are deposited onto the surface of the melt.
  • the charge well is also a location where additional metal or fluxes can be added to achieve a desired alloy.
  • Molten metal from the charge well 16 flows into the dross well 18 wherein impurities in the form of dross are skimmed from the surface before the melt flows back into the hearth 12.
  • This particular invention is directed to an improved design of the charge well 16.
  • the charge well can comprise an open top chamber including walls constructed of a heat resistant material.
  • the chamber includes an inlet positioned in a side wall (alternatively in the base) and in fluid communication with the pump well and an outlet positioned in its opposed side wall and in fluid communication with the dross wall (however the exit of molten metal through the chamber bottom wall with an internal conduit forming to a side exit is feasible).
  • the internal form of the chamber can be described as a bottom or low side wall inlet, a bottom outlet with a ramp formed adjacent the side wall.
  • the ramp can comprise a ledge extending from the charge well side wall toward the center of the chamber.
  • the metal scrap submergence device can be constructed in a manner which positions the bottom edge of the ramp on the base of the chamber adjacent the inlet.
  • the ledge can include an at least generally upward facing surface.
  • the upward facing surface can include a first end (bottom edge) engaging the base and a second end elevated above the base.
  • the upwardly facing surface can have a width between, for example, 5% and 33% of the chamber diameter. Accordingly, if two opposed upwardly facing surfaces are considered, the overall area could be 66%.
  • the ledge can further include an at least substantially horizontal wall extending from an edge of the upwardly facing surface opposite the sidewall to the chamber base and helping to define an outlet.
  • the horizontal wall may be inwardly or outwardly inclined.
  • the upwardly facing surface may engage an inner wall forming an outlet to the chamber at an edge opposed to the side wall.
  • the top edge of the wall can be at approximately the same height as the terminal edge of the ramp.
  • the ramp can also comprise a sloped surface that travels a full 360° around the chamber and extends at an incline from the base to the side wall effectively forming a cone shaped chamber base.
  • the ramp can spiral through at least 180°, 270°, 320°, or the entire chamber circumference.
  • the ramp upwardly facing surface can include a portion having a slope of about 5°, or 10° to 15°. However, it should be understood that the extent of the ramp around the chamber circumference can vary significantly and the slope can vary throughout the dimensions of the ramp.
  • Pump 20 is positioned in pump well 14 and draws molten aluminum from the hearth 12 forcing it into the charge well 16. More particularly, the rotation of impeller 22 draws molten aluminum from the bath 24, into the pump 20 and forces it through outlet 26, up passage 28, and through inlet 30 into the charge well 16. Molten aluminum flows up the ramp 32 within charge well 16, spilling over an inner edge 34 into cavity 36, and exits through outlet 38. The leading edge 44 of the ramp 32 can be positioned adjacent the inlet 30.
  • ramp 32 While it is beneficial that the ramp 32 be sloped, this does not need to be achieved by a constant incline. Rather, ramp 32 can be sloped over a first 180° portion 40, and remain horizontal over the final about 120° portion 42. Accordingly, the invention is intended to encompass all versions of a sloped ramp. Similarly, the invention is intended to encompass a ramp covering from as little as 45 0 of the circumference of the charge well 16 to 360°. However, a ramp extending between 180° and 270° is typical.
  • the present invention is applicable as a component for remodeling existing charge wells, it can be noted from FIG. 2 that the design includes a base section 46 of refractory material which elevates the cavity 36 to provide clearance for an outlet 38 and allows molten metal to flow into the dross well 18 of FIG. 1. As is recognized by those of ordinary skill in the art, metal chips being recycled are deposited onto the surface of the melt 48 in charge well 16.
  • FIG. 2 it is noted that a highly commercially successful system is depicted. Moreover, the system shown therein has been found to facilitate the turnover of up to 20,000 Ibs./hr. of molten aluminum. Obviously, the ability of a furnace to circulate the molten aluminum throughout the hearth to achieve introduction of scrap and desired alloying compounds is directly tied to the economic output of that furnace.
  • the molten metal pump component (in Figure 2) can be run at higher RPM.
  • a larger molten metal pump can be employed.
  • the charge well (16 in Figure 2) does not take full advantage of such an increased molten metal flow because the vortex formed therein may injest more air which in turn results in increased melt loss.
  • simply increasing the flow of molten metal output by the pump into the charge well may not improve scrap submergence because it may change the optimal shape of the vortex formed therein.
  • the ability to increase the charge well dimension to install a larger submergence bowl to take advantage of higher pump throughput is not always a viable option.
  • dead zone represents an area in which molten metal rotates within the chamber but only a limited portion enters the vortex and cavity 36.
  • the dead zone is problematic because it reduces the effective submergence area for added scrap and provides a quantity of molten metal that fails to circulate through the hearth, decreasing energy efficiency and raising BTU requirements for the system.
  • a scrap melting device 100 is comprised of a block of refractory material 102 which is constructed of a size suited to provide a relatively close tolerance mating with the dimensions of an existing charge well (e.g. charge well 16 of FIG. 1).
  • the block 102 is constructed of a cured material such as an alumina-silica refractory or other castable refractory material known to those skilled in the art.
  • the surfaces of the cast body will be treated with boron nitride prior to heat treatment.
  • Block 102 includes a chamber 116 having generally cylindrical side wall 118, a base 120 including ramp 121 , with an inner wall 122 forming a centrally located cavity 123 leading to outlet 124 and outlet duct 125.
  • Ramp 121 again begins with a leading edge 127 adjacent the inlet 126 to the chamber 116.
  • inlet 126 includes a tapered opening 128.
  • a flow-disruptive baffle 302 in the form of a wing or vane for example, is included on the wall of the chamber 116. More particularly, a plurality of baffles 302 are dispersed around the circumference of the chamber walls. It is envisioned that the baffle can be continuous, can comprise multiple baffles spaced evenly or unevenly around the circumference of the chamber, and can be at one or various heights within the chamber. Generally speaking, the baffle may have a downwardly inclined lower surface such that molten metal flowing from a center of the chamber 116 is directed downwardly.
  • the baffle in the case of a chamber wherein molten metal flow is predominantly upward against the wall 118 of the chamber 115, it may be desirable for the baffle to be downwardly inclined from its location on the wall toward its end proximate the chamber 116 center. Similarly, it may be desirable for the baffle to be downwardly inclined in its longitudinal extent in the direction of molten metal rotating within chamber 116. In this regard, the desired feature of the baffle is to drive molten metal downward in the chamber.
  • the baffle of U.S. Patent 6,036,745 provides one example.
  • inward refers to a ramp having a high edge adjacent the chamber side wall and a relatively lower edge closer to the center of the chamber.
  • An outward slant refers to a ramp having the opposite orientation. Inward and outward can generally be considered throughout this disclosure to refer to the relative position between chamber side wall and chamber center.
  • the slant of the ramp is not necessarily continuous. Moreover, it can slant in regions and remain horizontal in regions. Furthermore, the degree of slant can vary.
  • the inward and outward slope of the side walls is depicted as only extending for a limited range above the ramp, it is envisioned that the slope could continue as high as necessary to achieve gentle disturbance in the dead zone.
  • the incline of the walls is not necessarily continuous throughout the extent of the walls, nor is its shape and/or slope necessarily constant.
  • port 902 passing through block 102 with direct communication into dross well 18.
  • the port 902 can be at any height within the scrap melting device, such as slightly higher than the highest edge of the ramp 121.
  • port 902 could facilitate the transfer of molten metal from the dead zone adjacent the walls of charge well 16 and create flow therein.
  • port 902 can improve circulation between the chamber and dross well, which in turn improves burner to hearth bath heat transfer, allowing molten metal returning to the charge well to be at an elevated temperature. This can reduce residence time in the charge well, while maintaining a suitable vortex adjacent the center of the charge well.
  • a 360° ramp 1002 having a relatively constant slope from the chamber base to a side wall, effectively forming a cone shape can similarly include a baffle 1302, or inwardly shaped side wall 1702, or a passage 1902 communicating with a dross well and/or the pump well.
  • a removable vane 1501 is suspended from a top surface 1503 of the scrap submergence well 100.
  • the vane can have an elongated shape, such as a rectangle.
  • the portion of the vane designed for immersion into the molten metal within the charge well can be formed of a refractory material such as graphite or ceramic.
  • a hook end 1505 can be formed of metal such as steel. The hook end can be shaped to engage an external surface of the charge well. In certain embodiments the hook is detachable from the charge well, allowing the vane 1501 to be removed. This allows the charge well to be selectively operated with or without the vane. It is further noted that multiple vanes on one or several walls of the charge well could be employed.
  • FIG. 13 and 14 illustrate a diverter.
  • a scrap submergence device 100 can be comprised of a block of refractory material 2002 which can be constructed of a size suited to provide a relatively close tolerance mating with the dimensions of an existing charge well.
  • the block can be constructed of a cured material such as an alumina-silica refractory or other castable refractory material known to those skilled in the art.
  • the surfaces of the cast body can be treated with boron nitride prior to heat treatment.
  • Block 2002 defines a chamber 2016 having a generally cylindrical side wall 2018.
  • a base is provided within chamber 2016 including a ramp 2021.
  • Ramp 2021 surrounds a centrally located cavity 2013 leading to an outlet 2014.
  • a diverter element 2030 overlays outlet 2014.
  • the diverter can include a neck region 2033 shaped in a complementary manner to interface with the surface of an edge of outlet 2014.
  • the diverter can include a plurality of passages 2035 in the sidewall 2037. Passages could also be provided in the alternative or in addition in a top surface 2039.
  • the passages can include sloped inlet regions 2041 A and B which direct molten metal into the passages 2035.
  • the diverter element 2030 can be comprised of a refractory material such as graphite or ceramic.
  • the diverter may further include a densifying material (e.g. lead) cast therein to increase its overall mass and prevent current within the molten metal flowing within the chamber from physically moving the diverter.
  • a densifying material e.g. lead
  • the diverter 2030 may be held in position via an arm 3002.
  • arm 3002 allows the diverter 2030 to be positioned at a desirable location in the scrap submergence chamber 2016.
  • Arm 3002 can include a first end 3004 suitable for attachment to a post 3006.
  • Post 3006 is secured at one end to the arm 3002 and engages the diverter 2030 at an opposed end.
  • the arm 3002 is attached to an external wall 3008 of the scrap submergence chamber via a coupling 3010.
  • the coupling 3010 can include a cylindrical projection 3012 bolted to the arm 3002 and received in a sleeve 3014 to provide horizontal rotation.
  • the bolted connection in combination with elongated slot 3016 allows longitudinal adjustment of the arm length.
  • the arm is adjustable with regard to a penetration depth into the diameter of the scrap submergence well. This similarly allows the assembly to be used with wells of different sizes.
  • Post 3006 includes a metal rod 3018 and a refractory sheath 3020.
  • the rod 3018 includes a head element 3022 received within a pocket 3024 in the diverter 2030.
  • a refractory plug 3026 seals pocket 3024.
  • Post 3006 includes a spring element 3028 providing a compressing force on the sheath 3020. Moreover, a cap 3030 is disposed between the spring element 3028 and the sheath 3020. A bolt 3032 threadingly is received in the rod 3018 and engages insert 3034 to compress the spring element 3028 and impart a force on sheath 3020 via cap 3030. Cap 3030 can include a ring member 3040 to allow the post/diverter assembly to be easily grasped for removal from the vortexing chamber.
  • the diverter 2030 can be used to slow the submergence of scrap metal pieces. Slowing submergence provides a corresponding increase of residence time on the surface of the molten metal. This in turn allows for increased evaporation of processing fluids into the atmosphere above the charge well and reduces dross foam formation.
  • the diverter functions by allowing molten metal scrap to be deposited on the surface of the molten metal bath between the diverter and the interior walls of the chamber. It has been found that the effectiveness of the vortex created in the chamber increases in efficiency as the center of the chamber is approached. In this regard, it has been found that depositing the metal scrap chips between the diverter and the walls of the chamber can slow the egress of the chips from the scrap submergence chamber providing a longer residence time on the surface of the molten metal in the charge well and allowing dampness and processing fluids to be evaporated from the surface of the scrap materials before the scrap materials are submerged into the molten metal. In certain embodiments it may be desirable to provide the diverter disk with holes or passages. Moreover, a perforated diverter (disk or drum) may assist in tailoring a desired molten metal flow rate while still increasing scrap residence time in the charge well.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Furnace Details (AREA)

Abstract

La présente invention concerne un dispositif d'immersion de ferraille métallique comprenant une chambre supérieure ouverte comprenant des parois d'un matériau résistant à la chaleur, une entrée positionnée dans la chambre, une sortie positionnée dans la base de la chambre, et une rampe adjacente à la paroi latérale de la chambre. Le dispositif comprend en outre une aube et/ou un déflecteur amovible.
PCT/US2019/021886 2018-03-14 2019-03-12 Appareil d'immersion de ferraille métallique fondue WO2019178122A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR1020207029156A KR102709302B1 (ko) 2018-03-14 2019-03-12 용융 금속 조각 침수장치
CA3090845A CA3090845A1 (fr) 2018-03-14 2019-03-12 Appareil d'immersion de ferraille metallique fondue
MX2020008538A MX2020008538A (es) 2018-03-14 2019-03-12 Aparato de inmersion de chatarra de metal fundido.
CN201980018775.2A CN111868465B (zh) 2018-03-14 2019-03-12 熔融金属废料浸没设备
JP2020548679A JP7431167B2 (ja) 2018-03-14 2019-03-12 溶融金属スクラップ浸漬システム
EP19766667.0A EP3743663A4 (fr) 2018-03-14 2019-03-12 Appareil d'immersion de ferraille métallique fondue
BR112020016390-2A BR112020016390B1 (pt) 2018-03-14 2019-03-12 Aparelho de submersão de sucata de metal fundido

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US15/921,047 2018-03-14
US15/921,047 US10731922B2 (en) 2012-04-16 2018-03-14 Molten metal scrap submergence apparatus

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JPH08500633A (ja) * 1992-08-21 1996-01-23 カルダー アルミニウム リミティド 溶融金属中への固体金属の装入
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WO2005054521A1 (fr) * 2003-11-26 2005-06-16 Metaullics Systems Co., L.P. Appareil d'immersion de ferraille
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KR102709302B1 (ko) 2024-09-25
JP2021517932A (ja) 2021-07-29
KR20200121906A (ko) 2020-10-26
BR112020016390A2 (pt) 2020-12-15
EP3743663A4 (fr) 2021-11-03
BR112020016390B1 (pt) 2023-11-07
CN111868465A (zh) 2020-10-30
EP3743663A1 (fr) 2020-12-02
CA3090845A1 (fr) 2019-09-19
CN111868465B (zh) 2023-05-16
MX2020008538A (es) 2020-10-08
JP7431167B2 (ja) 2024-02-14

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